<?xml version="1.0"?>
<div class="add">

<b>let </b><font color="Maroon">c<sub>4</sub></font> be    <a href="subset_1.html#M2">Element</a> of  <a href="arytm_2.html#K1" target="_self">DEDEKIND_CUTS</a> ;<br/>

<b>assume </b><a NAME="E1:60"/><i><font color="Green">E57</font></i>: 
<font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="arytm_3.html#K13">{}</a> 
 ;<br/>

<div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="60_1"><b>per </b></a><a class="txt" onclick="hs(this)" href="javascript:()"><b>cases </b></a><span class="hide"><a NAME="E1:60_1"/>
( <font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2">{<span class="default"> <font color="Olive">b<sub>2</sub></font> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : <font color="Olive">b<sub>2</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Olive">b<sub>1</sub></font> </span>}</span>  where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="arytm_3.html#K13">{}</a>  </span>}</span>  or  not <font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2">{<span class="default"> <font color="Olive">b<sub>2</sub></font> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : <font color="Olive">b<sub>2</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Olive">b<sub>1</sub></font> </span>}</span>  where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="arytm_3.html#K13">{}</a>  </span>}</span>  )
 </span>;<br/><div class="add"><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="60_1_1"><b>suppose </b></a><a NAME="E1:60_1_1"/>
<font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2">{<span class="default"> <font color="Olive">b<sub>2</sub></font> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : <font color="Olive">b<sub>2</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Olive">b<sub>1</sub></font> </span>}</span>  where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="arytm_3.html#K13">{}</a>  </span>}</span> 
 ;<br/><div class="add"><b>then consider </b><font color="Maroon">c<sub>5</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E3:60_1_1"/><i><font color="Green">E58</font></i>: 
<font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R1">=</a> <span class="p1">{<span class="default"> <font color="Olive">b<sub>1</sub></font> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>5</sub></font> </span>}</span> 
 <b>and </b><br/><a NAME="E4:60_1_1"/><i><font color="Green">E59</font></i>: 
<font color="Maroon">c<sub>5</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="arytm_3.html#K13">{}</a> 
 ;<br/><b>consider </b><font color="Maroon">c<sub>6</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E6:60_1_1"/><i><font color="Green">E60</font></i>: 
<font color="Maroon">c<sub>5</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>6</sub></font> <a href="hidden.html#R1">=</a>  <a href="arytm_3.html#K14">one</a> 
 <b>by </b><i><a class="txt" href="arytm_2.html#E4:60_1_1"><i><font color="Green">E59</font></i></a>, <a class="ref" href="arytm_3.html#T60">ARYTM_3:60</a></i>;<br/><b>set </b><font color="Maroon">c<sub>7</sub></font> = <span class="p1">{<span class="default"> <font color="Olive">b<sub>1</sub></font> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>6</sub></font> </span>}</span> ;<br/><a NAME="E7:60_1_1"/>
<span class="p1">{<span class="default"> <font color="Olive">b<sub>1</sub></font> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>6</sub></font> </span>}</span>  <a href="tarski.html#R1">c=</a>  <a href="arytm_3.html#K7">RAT+</a> 
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_1_1_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">c<sub>8</sub></font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a><br/>

<b>assume </b><a NAME="E1:60_1_1_1"/>
<font color="Maroon">c<sub>8</sub></font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <font color="Olive">b<sub>1</sub></font> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>6</sub></font> </span>}</span> 
 ;<br/>

<a NAME="E2:60_1_1_1"/><b>then </b>
ex <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <br/>( <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>8</sub></font> &amp; <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>6</sub></font> )
 
;<br/>
<b>hence </b><a NAME="E3:60_1_1_1"/>
<font color="Maroon">c<sub>8</sub></font> <a href="hidden.html#R2">in</a>  <a href="arytm_3.html#K7">RAT+</a> 
 ;<br/>


</div><b>end;</b></div><b>then reconsider </b><font color="Maroon">c<sub>8</sub></font> = <span class="p1">{<span class="default"> <font color="Olive">b<sub>1</sub></font> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>6</sub></font> </span>}</span>  as   <a href="subset_1.html#NM2">Subset</a> of <a href="arytm_3.html#K7">RAT+</a>  ;<br/><a NAME="E9:60_1_1"/>
for <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  holds <br/>(  not <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>6</sub></font> or  not <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>6</sub></font> )
 ;<br/><a NAME="E10:60_1_1"/><b>then </b>
not <font color="Maroon">c<sub>6</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>8</sub></font>
 ;<br/><a NAME="E11:60_1_1"/><b>then </b><i><font color="Green">E61</font></i>: 
<font color="Maroon">c<sub>8</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="arytm_3.html#K7">RAT+</a> 
 ;<br/><a NAME="E12:60_1_1"/>
for <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>8</sub></font> holds <br/>( ( for <font color="Olive">b<sub>2</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <font color="Olive">b<sub>2</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Olive">b<sub>1</sub></font> holds <br/><font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>8</sub></font> ) &amp; ex <font color="Olive">b<sub>2</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <br/>( <font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>8</sub></font> &amp; <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Olive">b<sub>2</sub></font> ) )
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_1_1_2"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">c<sub>9</sub></font> be    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> ;<br/>

<b>assume </b><a NAME="E1:60_1_1_2"/>
<font color="Maroon">c<sub>9</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>8</sub></font>
 ;<br/>

<a NAME="E2:60_1_1_2"/><b>then </b><i><font color="Green">E62</font></i>: 
ex <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <br/>( <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>9</sub></font> &amp; <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>6</sub></font> )
 
;<br/>
<b>thus </b><a NAME="E3:60_1_1_2"/>
for <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>9</sub></font> holds <br/><font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>8</sub></font>
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_1_1_2_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">c<sub>10</sub></font> be    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> ;<br/>

<b>assume </b><a NAME="E1:60_1_1_2_1"/>
<font color="Maroon">c<sub>10</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>9</sub></font>
 ;<br/>

<a NAME="E2:60_1_1_2_1"/><b>then </b>
<font color="Maroon">c<sub>10</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>6</sub></font>
 
<b>by </b><i><a class="txt" href="arytm_2.html#E2:60_1_1_2"><i><font color="Green">E62</font></i></a>, <a class="ref" href="arytm_3.html#T76">ARYTM_3:76</a></i>;<br/>
<b>hence </b><a NAME="E3:60_1_1_2_1"/>
<font color="Maroon">c<sub>10</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>8</sub></font>
 ;<br/>


</div><b>end;</b></div>

<b>consider </b><font color="Maroon">c<sub>10</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E5:60_1_1_2"/><i><font color="Green">E63</font></i>: 
<font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>10</sub></font>
 <b>and </b><br/><a NAME="E6:60_1_1_2"/><i><font color="Green">E64</font></i>: 
<font color="Maroon">c<sub>10</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>6</sub></font>
 <b>by </b><i><a class="txt" href="arytm_2.html#E2:60_1_1_2"><i><font color="Green">E62</font></i></a>, <a class="ref" href="arytm_3.html#T101">ARYTM_3:101</a></i>;<br/>
<b>take </b>
<font color="Maroon">c<sub>10</sub></font>
;<br/>

<b>thus </b><a NAME="E7:60_1_1_2"/>
<font color="Maroon">c<sub>10</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>8</sub></font>
 <b>by </b><i><a class="txt" href="arytm_2.html#E6:60_1_1_2"><i><font color="Green">E64</font></i></a></i>;<br/>

<b>thus </b><a NAME="E8:60_1_1_2"/>
<font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>10</sub></font>
 <b>by </b><i><a class="txt" href="arytm_2.html#E5:60_1_1_2"><i><font color="Green">E63</font></i></a></i>;<br/>


</div><b>end;</b></div><a NAME="E13:60_1_1"/><b>then </b>
<font color="Maroon">c<sub>8</sub></font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <font color="Olive">b<sub>1</sub></font> where B is   <a href="subset_1.html#NM2">Subset</a> of <a href="arytm_3.html#K7">RAT+</a>  : for <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R2">in</a> <font color="Olive">b<sub>1</sub></font> holds <br/>( ( for <font color="Olive">b<sub>2</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <font color="Olive">b<sub>3</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Olive">b<sub>2</sub></font> holds <br/><font color="Olive">b<sub>3</sub></font> <a href="hidden.html#R2">in</a> <font color="Olive">b<sub>1</sub></font> ) &amp; ex <font color="Olive">b<sub>2</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <br/>( <font color="Olive">b<sub>3</sub></font> <a href="hidden.html#R2">in</a> <font color="Olive">b<sub>1</sub></font> &amp; <font color="Olive">b<sub>2</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Olive">b<sub>3</sub></font> ) ) </span>}</span> 
 ;<br/><b>then reconsider </b><font color="Maroon">c<sub>9</sub></font> = <font color="Maroon">c<sub>8</sub></font> as    <a href="subset_1.html#M2">Element</a> of  <a href="arytm_2.html#K1" target="_self">DEDEKIND_CUTS</a>  <b>by </b><i><a class="txt" href="arytm_2.html#E11:60_1_1"><i><font color="Green">E61</font></i></a>, <a class="ref" href="zfmisc_1.html#T64">ZFMISC_1:64</a></i>;<br/><a NAME="E15:60_1_1"/><i><font color="Green">E62</font></i>: 
<font color="Maroon">c<sub>4</sub></font> <a href="arytm_2.html#K6" target="_self">*'</a> <font color="Maroon">c<sub>9</sub></font> <a href="hidden.html#R1">=</a> <span class="p1">{<span class="default"> <font color="Olive">b<sub>1</sub></font> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>5</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>6</sub></font> </span>}</span> 
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_1_1_3"><b>proof </b></a><div class="add">

<b>thus </b><a NAME="E1:60_1_1_3"/>
<font color="Maroon">c<sub>4</sub></font> <a href="arytm_2.html#K6" target="_self">*'</a> <font color="Maroon">c<sub>9</sub></font> <a href="tarski.html#R1">c=</a> <span class="p1">{<span class="default"> <font color="Olive">b<sub>1</sub></font> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>5</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>6</sub></font> </span>}</span> 
  <i><font color="Red">:: according to </font></i><a class="ref" href="xboole_0.html#D10">XBOOLE_0:def 10</a><div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_1_1_3_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">c<sub>10</sub></font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a><br/>

<b>assume </b><a NAME="E1:60_1_1_3_1"/>
<font color="Maroon">c<sub>10</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> <a href="arytm_2.html#K6" target="_self">*'</a> <font color="Maroon">c<sub>9</sub></font>
 ;<br/>

<a NAME="E2:60_1_1_3_1"/><b>then </b>
<font color="Maroon">c<sub>10</sub></font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Olive">b<sub>2</sub></font></span>)</span> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> , B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : ( <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> &amp; <font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>9</sub></font> ) </span>}</span> 
 
;<br/>
<b>then consider </b><font color="Maroon">c<sub>11</sub></font>, <font color="Maroon">c<sub>12</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E4:60_1_1_3_1"/><i><font color="Green">E63</font></i>: 
<font color="Maroon">c<sub>10</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>11</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>12</sub></font>
 <b>and </b><br/><a NAME="E5:60_1_1_3_1"/><i><font color="Green">E64</font></i>: 
<font color="Maroon">c<sub>11</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font>
 <b>and </b><br/><a NAME="E6:60_1_1_3_1"/><i><font color="Green">E65</font></i>: 
<font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>9</sub></font>
 ;<br/>
<a NAME="E7:60_1_1_3_1"/><i><font color="Green">E66</font></i>: 
ex <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <br/>( <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>11</sub></font> &amp; <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>5</sub></font> )
 
<b>by </b><i><a class="txt" href="arytm_2.html#E3:60_1_1"><i><font color="Green">E58</font></i></a>, <a class="txt" href="arytm_2.html#E5:60_1_1_3_1"><i><font color="Green">E64</font></i></a></i>;<br/>
<a NAME="E8:60_1_1_3_1"/><i><font color="Green">E67</font></i>: 
ex <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <br/>( <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>12</sub></font> &amp; <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>6</sub></font> )
 
<b>by </b><i><a class="txt" href="arytm_2.html#E6:60_1_1_3_1"><i><font color="Green">E65</font></i></a></i>;<br/>
<a NAME="E9:60_1_1_3_1"/><b>then </b>
<font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">c<sub>6</sub></font>
 
;<br/>
<a NAME="E10:60_1_1_3_1"/><b>then </b><i><font color="Green">E68</font></i>: 
<font color="Maroon">c<sub>5</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">c<sub>5</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>6</sub></font>
 
<b>by </b><i><a class="txt" href="arytm_2.html#E4:60_1_1"><i><font color="Green">E59</font></i></a>, <a class="ref" href="arytm_3.html#T62">ARYTM_3:62</a></i>;<br/>
<a NAME="E11:60_1_1_3_1"/>
<font color="Maroon">c<sub>5</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>5</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>6</sub></font>
 
<b>by </b><i><a class="txt" href="arytm_2.html#E8:60_1_1_3_1"><i><font color="Green">E67</font></i></a>, <a class="ref" href="arytm_3.html#T90">ARYTM_3:90</a></i>;<br/>
<a NAME="E12:60_1_1_3_1"/><b>then </b><i><font color="Green">E69</font></i>: 
<font color="Maroon">c<sub>5</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>5</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>6</sub></font>
 
<b>by </b><i><a class="txt" href="arytm_2.html#E10:60_1_1_3_1"><i><font color="Green">E68</font></i></a>, <a class="ref" href="arytm_3.html#T75">ARYTM_3:75</a></i>;<br/>
<a NAME="E13:60_1_1_3_1"/>
<font color="Maroon">c<sub>11</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>5</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>12</sub></font>
 
<b>by </b><i><a class="txt" href="arytm_2.html#E7:60_1_1_3_1"><i><font color="Green">E66</font></i></a>, <a class="ref" href="arytm_3.html#T90">ARYTM_3:90</a></i>;<br/>
<a NAME="E14:60_1_1_3_1"/><b>then </b>
<font color="Maroon">c<sub>11</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>5</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>6</sub></font>
 
<b>by </b><i><a class="txt" href="arytm_2.html#E12:60_1_1_3_1"><i><font color="Green">E69</font></i></a>, <a class="ref" href="arytm_3.html#T76">ARYTM_3:76</a></i>;<br/>
<b>hence </b><a NAME="E15:60_1_1_3_1"/>
<font color="Maroon">c<sub>10</sub></font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <font color="Olive">b<sub>1</sub></font> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>5</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>6</sub></font> </span>}</span> 
 <b>by </b><i><a class="txt" href="arytm_2.html#E4:60_1_1_3_1"><i><font color="Green">E63</font></i></a></i>;<br/>


</div><b>end;</b></div>

<b>let </b><font color="Maroon">c<sub>10</sub></font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a><br/>

<b>assume </b><a NAME="E2:60_1_1_3"/>
<font color="Maroon">c<sub>10</sub></font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <font color="Olive">b<sub>1</sub></font> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>5</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>6</sub></font> </span>}</span> 
 ;<br/>

<b>then consider </b><font color="Maroon">c<sub>11</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E4:60_1_1_3"/><i><font color="Green">E63</font></i>: 
<font color="Maroon">c<sub>10</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>11</sub></font>
 <b>and </b><br/><a NAME="E5:60_1_1_3"/><i><font color="Green">E64</font></i>: 
<font color="Maroon">c<sub>11</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>5</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>6</sub></font>
 ;<br/>
<b>consider </b><font color="Maroon">c<sub>12</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E7:60_1_1_3"/><i><font color="Green">E65</font></i>: 
<font color="Maroon">c<sub>11</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>5</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>12</sub></font>
 <b>and </b><br/><a NAME="E8:60_1_1_3"/><i><font color="Green">E66</font></i>: 
<font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>6</sub></font>
 <b>by </b><i><a class="txt" href="arytm_2.html#E5:60_1_1_3"><i><font color="Green">E64</font></i></a>, <a class="ref" href="arytm_3.html#T87">ARYTM_3:87</a></i>;<br/>
<a NAME="E9:60_1_1_3"/>
<font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">c<sub>6</sub></font>
 
<b>by </b><i><a class="txt" href="arytm_2.html#E5:60_1_1_3"><i><font color="Green">E64</font></i></a>, <a class="txt" href="arytm_2.html#E7:60_1_1_3"><i><font color="Green">E65</font></i></a></i>;<br/>
<a NAME="E10:60_1_1_3"/><b>then </b>
<font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>6</sub></font>
 
<b>by </b><i><a class="txt" href="arytm_2.html#E8:60_1_1_3"><i><font color="Green">E66</font></i></a>, <a class="ref" href="arytm_3.html#T75">ARYTM_3:75</a></i>;<br/>
<a NAME="E11:60_1_1_3"/><b>then </b>
<font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>9</sub></font>
 
;<br/>
<b>then consider </b><font color="Maroon">c<sub>13</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E13:60_1_1_3"/><i><font color="Green">E67</font></i>: 
<font color="Maroon">c<sub>13</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>9</sub></font>
 <b>and </b><br/><a NAME="E14:60_1_1_3"/><i><font color="Green">E68</font></i>: 
<font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>13</sub></font>
 <b>by </b><i><a class="txt" href="arytm_2.html#E16"><i><font color="Green">Lemma11</font></i></a></i>;<br/>
<a NAME="E15:60_1_1_3"/>
<font color="Maroon">c<sub>5</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>13</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>5</sub></font>
 
<b>by </b><i><a class="txt" href="arytm_2.html#E14:60_1_1_3"><i><font color="Green">E68</font></i></a>, <a class="ref" href="arytm_3.html#T90">ARYTM_3:90</a></i>;<br/>
<b>then consider </b><font color="Maroon">c<sub>14</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E17:60_1_1_3"/><i><font color="Green">E69</font></i>: 
<font color="Maroon">c<sub>5</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>13</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font>
 <b>and </b><br/><a NAME="E18:60_1_1_3"/><i><font color="Green">E70</font></i>: 
<font color="Maroon">c<sub>14</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>5</sub></font>
 <b>by </b><i><a class="ref" href="arytm_3.html#T87">ARYTM_3:87</a></i>;<br/>
<a NAME="E19:60_1_1_3"/>
<font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">c<sub>13</sub></font>
 
<b>by </b><i><a class="txt" href="arytm_2.html#E14:60_1_1_3"><i><font color="Green">E68</font></i></a></i>;<br/>
<a NAME="E20:60_1_1_3"/><b>then </b>
<font color="Maroon">c<sub>14</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">c<sub>5</sub></font>
 
<b>by </b><i><a class="txt" href="arytm_2.html#E4:60_1_1"><i><font color="Green">E59</font></i></a>, <a class="txt" href="arytm_2.html#E17:60_1_1_3"><i><font color="Green">E69</font></i></a>, <a class="ref" href="arytm_3.html#T62">ARYTM_3:62</a></i>;<br/>
<a NAME="E21:60_1_1_3"/><b>then </b>
<font color="Maroon">c<sub>14</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>5</sub></font>
 
<b>by </b><i><a class="txt" href="arytm_2.html#E18:60_1_1_3"><i><font color="Green">E70</font></i></a>, <a class="ref" href="arytm_3.html#T75">ARYTM_3:75</a></i>;<br/>
<a NAME="E22:60_1_1_3"/><b>then </b>
<font color="Maroon">c<sub>14</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font>
 
<b>by </b><i><a class="txt" href="arytm_2.html#E3:60_1_1"><i><font color="Green">E58</font></i></a></i>;<br/>
<a NAME="E23:60_1_1_3"/><b>then </b>
<font color="Maroon">c<sub>10</sub></font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Olive">b<sub>2</sub></font></span>)</span> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> , B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : ( <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> &amp; <font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>9</sub></font> ) </span>}</span> 
 
<b>by </b><i><a class="txt" href="arytm_2.html#E4:60_1_1_3"><i><font color="Green">E63</font></i></a>, <a class="txt" href="arytm_2.html#E7:60_1_1_3"><i><font color="Green">E65</font></i></a>, <a class="txt" href="arytm_2.html#E13:60_1_1_3"><i><font color="Green">E67</font></i></a>, <a class="txt" href="arytm_2.html#E17:60_1_1_3"><i><font color="Green">E69</font></i></a></i>;<br/>
<b>hence </b><a NAME="E24:60_1_1_3"/>
<font color="Maroon">c<sub>10</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> <a href="arytm_2.html#K6" target="_self">*'</a> <font color="Maroon">c<sub>9</sub></font>
 ;<br/>


</div><b>end;</b></div><a NAME="E16:60_1_1"/>
ex <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <br/>( <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>3</sub></font> &amp;  <a href="arytm_2.html#K3" target="_self">DEDEKIND_CUT</a> <font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a> <span class="p1">{<span class="default"> <font color="Olive">b<sub>2</sub></font> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : <font color="Olive">b<sub>2</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Olive">b<sub>1</sub></font> </span>}</span>  )
 <b>by </b><i><a class="ref" href="arytm_2.html#D3" target="_self">Def3</a></i>;<br/><b>hence </b><a NAME="E17:60_1_1"/>
ex <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M2">Element</a> of  <a href="arytm_2.html#K1" target="_self">DEDEKIND_CUTS</a>  st <font color="Maroon">c<sub>4</sub></font> <a href="arytm_2.html#K6" target="_self">*'</a> <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R1">=</a>  <a href="arytm_2.html#K3" target="_self">DEDEKIND_CUT</a> <font color="Maroon">c<sub>3</sub></font>
 <b>by </b><i><a class="txt" href="arytm_2.html#E6:60_1_1"><i><font color="Green">E60</font></i></a>, <a class="txt" href="arytm_2.html#E15:60_1_1"><i><font color="Green">E62</font></i></a></i>;<br/></div><b>end;</b></div><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="60_1_2"><b>suppose </b></a><a NAME="E1:60_1_2"/><i><font color="Green">E58</font></i>: 
not <font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2">{<span class="default"> <font color="Olive">b<sub>2</sub></font> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : <font color="Olive">b<sub>2</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Olive">b<sub>1</sub></font> </span>}</span>  where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="arytm_3.html#K13">{}</a>  </span>}</span> 
 ;<br/><div class="add"><b>set </b><font color="Maroon">c<sub>5</sub></font> = <span class="p1">{<span class="default"> <font color="Olive">b<sub>1</sub></font> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : ex <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <br/>( not <font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> &amp; <font color="Olive">b<sub>2</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#R3">&lt;='</a>  <a href="arytm_3.html#K14">one</a>  ) </span>}</span> ;<br/><a NAME="E2:60_1_2"/><i><font color="Green">E59</font></i>: 
<font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="arytm_3.html#K7">RAT+</a> 
 <b>by </b><i><a class="ref" href="zfmisc_1.html#T64">ZFMISC_1:64</a></i>;<br/><b>then consider </b><font color="Maroon">c<sub>6</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E4:60_1_2"/><i><font color="Green">E60</font></i>: 
not <font color="Maroon">c<sub>6</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font>
 <b>by </b><i><a class="ref" href="subset_1.html#T49">SUBSET_1:49</a></i>;<br/><a NAME="E5:60_1_2"/>
<font color="Maroon">c<sub>6</sub></font> <a href="arytm_3.html#K12">*'</a> <a href="arytm_3.html#K13">{}</a>  <a href="hidden.html#R1">=</a>  <a href="arytm_3.html#K13">{}</a> 
 <b>by </b><i><a class="ref" href="arytm_3.html#T54">ARYTM_3:54</a></i>;<br/><a NAME="E6:60_1_2"/><b>then </b>
( <font color="Maroon">c<sub>6</sub></font> <a href="arytm_3.html#K12">*'</a> <a href="arytm_3.html#K13">{}</a>  <a href="arytm_3.html#R3">&lt;='</a>  <a href="arytm_3.html#K14">one</a>  &amp; <font color="Maroon">c<sub>6</sub></font> <a href="arytm_3.html#K12">*'</a> <a href="arytm_3.html#K13">{}</a>  <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="arytm_3.html#K14">one</a>  )
 <b>by </b><i><a class="ref" href="arytm_3.html#T71">ARYTM_3:71</a></i>;<br/><a NAME="E7:60_1_2"/><b>then </b><i><font color="Green">E61</font></i>: 
 <a href="arytm_3.html#K13">{}</a>  <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <font color="Olive">b<sub>1</sub></font> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : ex <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <br/>( not <font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> &amp; <font color="Olive">b<sub>2</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#R3">&lt;='</a>  <a href="arytm_3.html#K14">one</a>  ) </span>}</span> 
 <b>by </b><i><a class="txt" href="arytm_2.html#E4:60_1_2"><i><font color="Green">E60</font></i></a></i>;<br/><a NAME="E8:60_1_2"/>
<span class="p1">{<span class="default"> <font color="Olive">b<sub>1</sub></font> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : ex <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <br/>( not <font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> &amp; <font color="Olive">b<sub>2</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#R3">&lt;='</a>  <a href="arytm_3.html#K14">one</a>  ) </span>}</span>  <a href="tarski.html#R1">c=</a>  <a href="arytm_3.html#K7">RAT+</a> 
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_1_2_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">c<sub>7</sub></font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a><br/>

<b>assume </b><a NAME="E1:60_1_2_1"/>
<font color="Maroon">c<sub>7</sub></font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <font color="Olive">b<sub>1</sub></font> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : ex <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <br/>( not <font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> &amp; <font color="Olive">b<sub>2</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#R3">&lt;='</a>  <a href="arytm_3.html#K14">one</a>  ) </span>}</span> 
 ;<br/>

<a NAME="E2:60_1_2_1"/><b>then </b>
ex <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <br/>( <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>7</sub></font> &amp; ex <font color="Olive">b<sub>2</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <br/>( not <font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> &amp; <font color="Olive">b<sub>2</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#R3">&lt;='</a>  <a href="arytm_3.html#K14">one</a>  ) )
 
;<br/>
<b>hence </b><a NAME="E3:60_1_2_1"/>
<font color="Maroon">c<sub>7</sub></font> <a href="hidden.html#R2">in</a>  <a href="arytm_3.html#K7">RAT+</a> 
 ;<br/>


</div><b>end;</b></div><b>then reconsider </b><font color="Maroon">c<sub>7</sub></font> = <span class="p1">{<span class="default"> <font color="Olive">b<sub>1</sub></font> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : ex <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <br/>( not <font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> &amp; <font color="Olive">b<sub>2</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#R3">&lt;='</a>  <a href="arytm_3.html#K14">one</a>  ) </span>}</span>  as  non <a href="xboole_0.html#V1">empty</a> <a href="subset_1.html#NM2">Subset</a> of <a href="arytm_3.html#K7">RAT+</a>  <b>by </b><i><a class="txt" href="arytm_2.html#E7:60_1_2"><i><font color="Green">E61</font></i></a></i>;<br/><a NAME="E10:60_1_2"/><i><font color="Green">E62</font></i>: 
<font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <font color="Olive">b<sub>1</sub></font> where B is   <a href="subset_1.html#NM2">Subset</a> of <a href="arytm_3.html#K7">RAT+</a>  : for <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R2">in</a> <font color="Olive">b<sub>1</sub></font> holds <br/>( ( for <font color="Olive">b<sub>2</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <font color="Olive">b<sub>3</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Olive">b<sub>2</sub></font> holds <br/><font color="Olive">b<sub>3</sub></font> <a href="hidden.html#R2">in</a> <font color="Olive">b<sub>1</sub></font> ) &amp; ex <font color="Olive">b<sub>2</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <br/>( <font color="Olive">b<sub>3</sub></font> <a href="hidden.html#R2">in</a> <font color="Olive">b<sub>1</sub></font> &amp; <font color="Olive">b<sub>2</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Olive">b<sub>3</sub></font> ) ) </span>}</span> 
 <b>by </b><i><a class="ref" href="zfmisc_1.html#T64">ZFMISC_1:64</a></i>;<br/><b>consider </b><font color="Maroon">c<sub>8</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E12:60_1_2"/><i><font color="Green">E63</font></i>: 
<font color="Maroon">c<sub>8</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font>
 <b>by </b><i><a class="txt" href="arytm_2.html#E1:60"><i><font color="Green">E57</font></i></a>, <a class="ref" href="subset_1.html#T10">SUBSET_1:10</a></i>;<br/><a NAME="E13:60_1_2"/>
 <a href="arytm_3.html#K13">{}</a>  <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>8</sub></font>
 <b>by </b><i><a class="ref" href="arytm_3.html#T71">ARYTM_3:71</a></i>;<br/><a NAME="E14:60_1_2"/><b>then </b><i><font color="Green">E64</font></i>: 
 <a href="arytm_3.html#K13">{}</a>  <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font>
 <b>by </b><i><a class="txt" href="arytm_2.html#E10:60_1_2"><i><font color="Green">E62</font></i></a>, <a class="txt" href="arytm_2.html#E12:60_1_2"><i><font color="Green">E63</font></i></a>, <a class="txt" href="arytm_2.html#E48"><i><font color="Green">Lemma39</font></i></a></i>;<br/><a NAME="E15:60_1_2"/>
for <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>7</sub></font> holds <br/>( ( for <font color="Olive">b<sub>2</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <font color="Olive">b<sub>2</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Olive">b<sub>1</sub></font> holds <br/><font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>7</sub></font> ) &amp; ex <font color="Olive">b<sub>2</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <br/>( <font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>7</sub></font> &amp; <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Olive">b<sub>2</sub></font> ) )
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_1_2_2"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">c<sub>9</sub></font> be    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> ;<br/>

<b>assume </b><a NAME="E1:60_1_2_2"/>
<font color="Maroon">c<sub>9</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>7</sub></font>
 ;<br/>

<a NAME="E2:60_1_2_2"/><b>then </b>
ex <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <br/>( <font color="Maroon">c<sub>9</sub></font> <a href="hidden.html#R1">=</a> <font color="Olive">b<sub>1</sub></font> &amp; ex <font color="Olive">b<sub>2</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <br/>( not <font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> &amp; <font color="Olive">b<sub>2</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#R3">&lt;='</a>  <a href="arytm_3.html#K14">one</a>  ) )
 
;<br/>
<b>then consider </b><font color="Maroon">c<sub>10</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E4:60_1_2_2"/><i><font color="Green">E65</font></i>: 
not <font color="Maroon">c<sub>10</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font>
 <b>and </b><br/><a NAME="E5:60_1_2_2"/><i><font color="Green">E66</font></i>: 
<font color="Maroon">c<sub>10</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#R3">&lt;='</a>  <a href="arytm_3.html#K14">one</a> 
 ;<br/>
<b>thus </b><a NAME="E6:60_1_2_2"/>
for <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>9</sub></font> holds <br/><font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>7</sub></font>
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_1_2_2_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">c<sub>11</sub></font> be    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> ;<br/>

<b>assume </b><a NAME="E1:60_1_2_2_1"/>
<font color="Maroon">c<sub>11</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>9</sub></font>
 ;<br/>

<a NAME="E2:60_1_2_2_1"/><b>then </b>
<font color="Maroon">c<sub>10</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>11</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>10</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>9</sub></font>
 
<b>by </b><i><a class="ref" href="arytm_3.html#T90">ARYTM_3:90</a></i>;<br/>
<a NAME="E3:60_1_2_2_1"/><b>then </b>
<font color="Maroon">c<sub>10</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>11</sub></font> <a href="arytm_3.html#R3">&lt;='</a>  <a href="arytm_3.html#K14">one</a> 
 
<b>by </b><i><a class="txt" href="arytm_2.html#E5:60_1_2_2"><i><font color="Green">E66</font></i></a>, <a class="ref" href="arytm_3.html#T74">ARYTM_3:74</a></i>;<br/>
<b>hence </b><a NAME="E4:60_1_2_2_1"/>
<font color="Maroon">c<sub>11</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>7</sub></font>
 <b>by </b><i><a class="txt" href="arytm_2.html#E4:60_1_2_2"><i><font color="Green">E65</font></i></a></i>;<br/>


</div><b>end;</b></div>

<a NAME="E7:60_1_2_2"/>
<font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R2">in</a> <a href="arytm_2.html#K1" target="_self">DEDEKIND_CUTS</a>  <a href="subset_1.html#K7">\</a> <span class="p1">{<span class="default"> <span class="p2">{<span class="default"> <font color="Olive">b<sub>2</sub></font> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : <font color="Olive">b<sub>2</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Olive">b<sub>1</sub></font> </span>}</span>  where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="arytm_3.html#K13">{}</a>  </span>}</span> 
 
<b>by </b><i><a class="txt" href="arytm_2.html#E1:60_1_2"><i><font color="Green">E58</font></i></a>, <a class="ref" href="xboole_0.html#D4">XBOOLE_0:def 4</a></i>;<br/>
<b>then consider </b><font color="Maroon">c<sub>11</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E9:60_1_2_2"/><i><font color="Green">E67</font></i>: 
not <font color="Maroon">c<sub>11</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font>
 <b>and </b><br/><a NAME="E10:60_1_2_2"/><i><font color="Green">E68</font></i>: 
<font color="Maroon">c<sub>11</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>10</sub></font>
 <b>by </b><i><a class="txt" href="arytm_2.html#E12:60_1_2"><i><font color="Green">E63</font></i></a>, <a class="txt" href="arytm_2.html#E4:60_1_2_2"><i><font color="Green">E65</font></i></a>, <a class="txt" href="arytm_2.html#E28"><i><font color="Green">Lemma23</font></i></a></i>;<br/>
<a NAME="E11:60_1_2_2"/><i><font color="Green">E69</font></i>: 
( <font color="Maroon">c<sub>11</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>10</sub></font> &amp; <font color="Maroon">c<sub>11</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">c<sub>10</sub></font> )
 
<b>by </b><i><a class="txt" href="arytm_2.html#E10:60_1_2_2"><i><font color="Green">E68</font></i></a></i>;<br/>
<b>consider </b><font color="Maroon">c<sub>12</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E13:60_1_2_2"/><i><font color="Green">E70</font></i>: 
 <a href="arytm_3.html#K14">one</a>  <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>11</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>12</sub></font>
 <b>by </b><i><a class="txt" href="arytm_2.html#E14:60_1_2"><i><font color="Green">E64</font></i></a>, <a class="txt" href="arytm_2.html#E9:60_1_2_2"><i><font color="Green">E67</font></i></a>, <a class="ref" href="arytm_3.html#T61">ARYTM_3:61</a></i>;<br/>
<b>take </b>
<font color="Maroon">c<sub>12</sub></font>
;<br/>

<a NAME="E14:60_1_2_2"/>
<font color="Maroon">c<sub>11</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#R3">&lt;='</a>  <a href="arytm_3.html#K14">one</a> 
 
<b>by </b><i><a class="txt" href="arytm_2.html#E13:60_1_2_2"><i><font color="Green">E70</font></i></a></i>;<br/>
<b>hence </b><a NAME="E15:60_1_2_2"/>
<font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>7</sub></font>
 <b>by </b><i><a class="txt" href="arytm_2.html#E9:60_1_2_2"><i><font color="Green">E67</font></i></a></i>;<br/>

<a NAME="E16:60_1_2_2"/>
<font color="Maroon">c<sub>11</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>10</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>9</sub></font>
 
<b>by </b><i><a class="txt" href="arytm_2.html#E10:60_1_2_2"><i><font color="Green">E68</font></i></a>, <a class="ref" href="arytm_3.html#T90">ARYTM_3:90</a></i>;<br/>
<a NAME="E17:60_1_2_2"/><b>then </b>
<font color="Maroon">c<sub>11</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>11</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>12</sub></font>
 
<b>by </b><i><a class="txt" href="arytm_2.html#E5:60_1_2_2"><i><font color="Green">E66</font></i></a>, <a class="txt" href="arytm_2.html#E13:60_1_2_2"><i><font color="Green">E70</font></i></a>, <a class="ref" href="arytm_3.html#T74">ARYTM_3:74</a></i>;<br/>
<a NAME="E18:60_1_2_2"/><b>then </b><i><font color="Green">E71</font></i>: 
<font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>12</sub></font>
 
<b>by </b><i><a class="txt" href="arytm_2.html#E14:60_1_2"><i><font color="Green">E64</font></i></a>, <a class="txt" href="arytm_2.html#E9:60_1_2_2"><i><font color="Green">E67</font></i></a>, <a class="ref" href="arytm_3.html#T88">ARYTM_3:88</a></i>;<br/>
<a NAME="E19:60_1_2_2"/><i><font color="Green">E72</font></i>: 
<font color="Maroon">c<sub>11</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>10</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>12</sub></font>
 
<b>by </b><i><a class="txt" href="arytm_2.html#E10:60_1_2_2"><i><font color="Green">E68</font></i></a>, <a class="ref" href="arytm_3.html#T90">ARYTM_3:90</a></i>;<br/>
<a NAME="E20:60_1_2_2"/><i><font color="Green">E73</font></i>: 
<font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="arytm_3.html#K13">{}</a> 
 
<b>by </b><i><a class="txt" href="arytm_2.html#E13:60_1_2_2"><i><font color="Green">E70</font></i></a>, <a class="ref" href="arytm_3.html#T54">ARYTM_3:54</a></i>;<br/>
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_1_2_2_2"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:60_1_2_2_2"/>
<font color="Maroon">c<sub>9</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>12</sub></font>
 ;<br/><a NAME="E2:60_1_2_2_2"/><b>then </b>
<font color="Maroon">c<sub>11</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>10</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>12</sub></font>
 <b>by </b><i><a class="txt" href="arytm_2.html#E5:60_1_2_2"><i><font color="Green">E66</font></i></a>, <a class="txt" href="arytm_2.html#E13:60_1_2_2"><i><font color="Green">E70</font></i></a>, <a class="txt" href="arytm_2.html#E19:60_1_2_2"><i><font color="Green">E72</font></i></a>, <a class="ref" href="arytm_3.html#T73">ARYTM_3:73</a></i>;<br/><b>hence </b><a NAME="E3:60_1_2_2_2"/>
contradiction
 <b>by </b><i><a class="txt" href="arytm_2.html#E11:60_1_2_2"><i><font color="Green">E69</font></i></a>, <a class="txt" href="arytm_2.html#E20:60_1_2_2"><i><font color="Green">E73</font></i></a>, <a class="ref" href="arytm_3.html#T62">ARYTM_3:62</a></i>;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E22:60_1_2_2"/>
<font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">c<sub>12</sub></font>
 <b>by </b><i><a class="txt" href="arytm_2.html#E18:60_1_2_2"><i><font color="Green">E71</font></i></a>, <a class="ref" href="arytm_3.html#T75">ARYTM_3:75</a></i>;<br/>


</div><b>end;</b></div><a NAME="E16:60_1_2"/><b>then </b><i><font color="Green">E65</font></i>: 
<font color="Maroon">c<sub>7</sub></font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <font color="Olive">b<sub>1</sub></font> where B is   <a href="subset_1.html#NM2">Subset</a> of <a href="arytm_3.html#K7">RAT+</a>  : for <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R2">in</a> <font color="Olive">b<sub>1</sub></font> holds <br/>( ( for <font color="Olive">b<sub>2</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <font color="Olive">b<sub>3</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Olive">b<sub>2</sub></font> holds <br/><font color="Olive">b<sub>3</sub></font> <a href="hidden.html#R2">in</a> <font color="Olive">b<sub>1</sub></font> ) &amp; ex <font color="Olive">b<sub>2</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <br/>( <font color="Olive">b<sub>3</sub></font> <a href="hidden.html#R2">in</a> <font color="Olive">b<sub>1</sub></font> &amp; <font color="Olive">b<sub>2</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Olive">b<sub>3</sub></font> ) ) </span>}</span> 
 ;<br/><b>consider </b><font color="Maroon">c<sub>9</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E18:60_1_2"/><i><font color="Green">E66</font></i>: 
<font color="Maroon">c<sub>9</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font>
 <b>and </b><br/><a NAME="E19:60_1_2"/><i><font color="Green">E67</font></i>: 
<font color="Maroon">c<sub>9</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="arytm_3.html#K13">{}</a> 
 <b>by </b><i><a class="txt" href="arytm_2.html#E1:60"><i><font color="Green">E57</font></i></a>, <a class="txt" href="arytm_2.html#E10:60_1_2"><i><font color="Green">E62</font></i></a>, <a class="txt" href="arytm_2.html#E69"><i><font color="Green">Lemma55</font></i></a></i>;<br/><b>consider </b><font color="Maroon">c<sub>10</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E21:60_1_2"/><i><font color="Green">E68</font></i>: 
<font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>10</sub></font> <a href="hidden.html#R1">=</a>  <a href="arytm_3.html#K14">one</a> 
 <b>by </b><i><a class="txt" href="arytm_2.html#E19:60_1_2"><i><font color="Green">E67</font></i></a>, <a class="ref" href="arytm_3.html#T61">ARYTM_3:61</a></i>;<br/><div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_1_2_3"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:60_1_2_3"/>
<font color="Maroon">c<sub>10</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>7</sub></font>
 ;<br/><a NAME="E2:60_1_2_3"/><b>then </b>
ex <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <br/>( <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>10</sub></font> &amp; ex <font color="Olive">b<sub>2</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <br/>( not <font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> &amp; <font color="Olive">b<sub>2</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#R3">&lt;='</a>  <a href="arytm_3.html#K14">one</a>  ) )
 ;<br/><b>then consider </b><font color="Maroon">c<sub>11</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E4:60_1_2_3"/><i><font color="Green">E69</font></i>: 
not <font color="Maroon">c<sub>11</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font>
 <b>and </b><br/><a NAME="E5:60_1_2_3"/><i><font color="Green">E70</font></i>: 
<font color="Maroon">c<sub>11</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>10</sub></font> <a href="arytm_3.html#R3">&lt;='</a>  <a href="arytm_3.html#K14">one</a> 
 ;<br/><a NAME="E6:60_1_2_3"/>
<font color="Maroon">c<sub>10</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="arytm_3.html#K13">{}</a> 
 <b>by </b><i><a class="txt" href="arytm_2.html#E21:60_1_2"><i><font color="Green">E68</font></i></a>, <a class="ref" href="arytm_3.html#T54">ARYTM_3:54</a></i>;<br/><a NAME="E7:60_1_2_3"/><b>then </b>
<font color="Maroon">c<sub>11</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>9</sub></font>
 <b>by </b><i><a class="txt" href="arytm_2.html#E21:60_1_2"><i><font color="Green">E68</font></i></a>, <a class="txt" href="arytm_2.html#E5:60_1_2_3"><i><font color="Green">E70</font></i></a>, <a class="ref" href="arytm_3.html#T88">ARYTM_3:88</a></i>;<br/><b>hence </b><a NAME="E8:60_1_2_3"/>
contradiction
 <b>by </b><i><a class="txt" href="arytm_2.html#E10:60_1_2"><i><font color="Green">E62</font></i></a>, <a class="txt" href="arytm_2.html#E18:60_1_2"><i><font color="Green">E66</font></i></a>, <a class="txt" href="arytm_2.html#E4:60_1_2_3"><i><font color="Green">E69</font></i></a>, <a class="txt" href="arytm_2.html#E48"><i><font color="Green">Lemma39</font></i></a></i>;<br/></div><b>end;</b></div><a NAME="E23:60_1_2"/><b>then </b>
<font color="Maroon">c<sub>7</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="arytm_3.html#K7">RAT+</a> 
 ;<br/><a NAME="E24:60_1_2"/><b>then </b>
not <font color="Maroon">c<sub>7</sub></font> <a href="hidden.html#R2">in</a> <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><a href="arytm_3.html#K7">RAT+</a> </span><a href="tarski.html#K1">}</a></span>
 <b>by </b><i><a class="ref" href="tarski.html#D1">TARSKI:def 1</a></i>;<br/><b>then reconsider </b><font color="Maroon">c<sub>11</sub></font> = <font color="Maroon">c<sub>7</sub></font> as    <a href="subset_1.html#M2">Element</a> of  <a href="arytm_2.html#K1" target="_self">DEDEKIND_CUTS</a>  <b>by </b><i><a class="txt" href="arytm_2.html#E16:60_1_2"><i><font color="Green">E65</font></i></a>, <a class="ref" href="xboole_0.html#D4">XBOOLE_0:def 4</a></i>;<br/><b>take </b>
<font color="Maroon">c<sub>11</sub></font>
;<br/><a NAME="E26:60_1_2"/>
for <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  holds <br/>( <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> <a href="arytm_2.html#K6" target="_self">*'</a> <font color="Maroon">c<sub>11</sub></font> iff <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a>  <a href="arytm_3.html#K14">one</a>  )
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_1_2_4"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">c<sub>12</sub></font> be    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> ;<br/>

<div><b>hereby </b>
<div class="add"><b>assume </b><a NAME="E1:60_1_2_4_1"/>
<font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> <a href="arytm_2.html#K6" target="_self">*'</a> <font color="Maroon">c<sub>11</sub></font>
 ;<br/><a NAME="E2:60_1_2_4_1"/><b>then </b>
<font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Olive">b<sub>2</sub></font></span>)</span> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> , B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : ( <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> &amp; <font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>11</sub></font> ) </span>}</span> 
 ;<br/><b>then consider </b><font color="Maroon">c<sub>13</sub></font>, <font color="Maroon">c<sub>14</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E4:60_1_2_4_1"/><i><font color="Green">E69</font></i>: 
<font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>13</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font>
 <b>and </b><br/><a NAME="E5:60_1_2_4_1"/><i><font color="Green">E70</font></i>: 
<font color="Maroon">c<sub>13</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font>
 <b>and </b><br/><a NAME="E6:60_1_2_4_1"/><i><font color="Green">E71</font></i>: 
<font color="Maroon">c<sub>14</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>11</sub></font>
 ;<br/><a NAME="E7:60_1_2_4_1"/>
ex <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <br/>( <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>14</sub></font> &amp; ex <font color="Olive">b<sub>2</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <br/>( not <font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> &amp; <font color="Olive">b<sub>2</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#R3">&lt;='</a>  <a href="arytm_3.html#K14">one</a>  ) )
 <b>by </b><i><a class="txt" href="arytm_2.html#E6:60_1_2_4_1"><i><font color="Green">E71</font></i></a></i>;<br/><b>then consider </b><font color="Maroon">c<sub>15</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E9:60_1_2_4_1"/><i><font color="Green">E72</font></i>: 
not <font color="Maroon">c<sub>15</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font>
 <b>and </b><br/><a NAME="E10:60_1_2_4_1"/><i><font color="Green">E73</font></i>: 
<font color="Maroon">c<sub>15</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font> <a href="arytm_3.html#R3">&lt;='</a>  <a href="arytm_3.html#K14">one</a> 
 ;<br/><a NAME="E11:60_1_2_4_1"/>
<font color="Maroon">c<sub>13</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>15</sub></font>
 <b>by </b><i><a class="txt" href="arytm_2.html#E10:60_1_2"><i><font color="Green">E62</font></i></a>, <a class="txt" href="arytm_2.html#E5:60_1_2_4_1"><i><font color="Green">E70</font></i></a>, <a class="txt" href="arytm_2.html#E9:60_1_2_4_1"><i><font color="Green">E72</font></i></a>, <a class="txt" href="arytm_2.html#E48"><i><font color="Green">Lemma39</font></i></a></i>;<br/><a NAME="E12:60_1_2_4_1"/><b>then </b><i><font color="Green">E74</font></i>: 
<font color="Maroon">c<sub>13</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>15</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font>
 <b>by </b><i><a class="ref" href="arytm_3.html#T90">ARYTM_3:90</a></i>;<br/><a NAME="E13:60_1_2_4_1"/><b>then </b><i><font color="Green">E75</font></i>: 
<font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#R3">&lt;='</a>  <a href="arytm_3.html#K14">one</a> 
 <b>by </b><i><a class="txt" href="arytm_2.html#E4:60_1_2_4_1"><i><font color="Green">E69</font></i></a>, <a class="txt" href="arytm_2.html#E10:60_1_2_4_1"><i><font color="Green">E73</font></i></a>, <a class="ref" href="arytm_3.html#T74">ARYTM_3:74</a></i>;<br/><div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_1_2_4_1_1"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:60_1_2_4_1_1"/><i><font color="Green">E76</font></i>: 
<font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#R1">=</a>  <a href="arytm_3.html#K14">one</a> 
 ;<br/><a NAME="E2:60_1_2_4_1_1"/><b>then </b><i><font color="Green">E77</font></i>: 
<font color="Maroon">c<sub>14</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="arytm_3.html#K13">{}</a> 
 <b>by </b><i><a class="txt" href="arytm_2.html#E4:60_1_2_4_1"><i><font color="Green">E69</font></i></a>, <a class="ref" href="arytm_3.html#T54">ARYTM_3:54</a></i>;<br/><a NAME="E3:60_1_2_4_1_1"/>
<font color="Maroon">c<sub>13</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>15</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font>
 <b>by </b><i><a class="txt" href="arytm_2.html#E4:60_1_2_4_1"><i><font color="Green">E69</font></i></a>, <a class="txt" href="arytm_2.html#E10:60_1_2_4_1"><i><font color="Green">E73</font></i></a>, <a class="txt" href="arytm_2.html#E12:60_1_2_4_1"><i><font color="Green">E74</font></i></a>, <a class="txt" href="arytm_2.html#E1:60_1_2_4_1_1"><i><font color="Green">E76</font></i></a>, <a class="ref" href="arytm_3.html#T73">ARYTM_3:73</a></i>;<br/><b>hence </b><a NAME="E4:60_1_2_4_1_1"/>
contradiction
 <b>by </b><i><a class="txt" href="arytm_2.html#E5:60_1_2_4_1"><i><font color="Green">E70</font></i></a>, <a class="txt" href="arytm_2.html#E9:60_1_2_4_1"><i><font color="Green">E72</font></i></a>, <a class="txt" href="arytm_2.html#E2:60_1_2_4_1_1"><i><font color="Green">E77</font></i></a>, <a class="ref" href="arytm_3.html#T62">ARYTM_3:62</a></i>;<br/></div><b>end;</b></div><b>hence </b><a NAME="E15:60_1_2_4_1"/>
<font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a>  <a href="arytm_3.html#K14">one</a> 
 <b>by </b><i><a class="txt" href="arytm_2.html#E13:60_1_2_4_1"><i><font color="Green">E75</font></i></a>, <a class="ref" href="arytm_3.html#T75">ARYTM_3:75</a></i>;<br/></div>
<b>end;</b></div>

<b>assume </b><a NAME="E2:60_1_2_4"/><i><font color="Green">E69</font></i>: 
<font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#NR4" target="_self">&lt;</a>  <a href="arytm_3.html#K14">one</a> 
 ;<br/>

<a NAME="E3:60_1_2_4"/><b>then </b><i><font color="Green">E70</font></i>: 
( <font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#R3">&lt;='</a>  <a href="arytm_3.html#K14">one</a>  &amp; <font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="arytm_3.html#K14">one</a>  )
 
;<br/>
<div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="60_1_2_4_2"><b>per </b></a><a class="txt" onclick="hs(this)" href="javascript:()"><b>cases </b></a><span class="hide"><a NAME="E1:60_1_2_4_2"/>
( <font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#R1">=</a>  <a href="arytm_3.html#K13">{}</a>  or <font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="arytm_3.html#K13">{}</a>  )
 </span>;<br/><div class="add"><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="60_1_2_4_2_1"><b>suppose </b></a><a NAME="E1:60_1_2_4_2_1"/>
<font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#R1">=</a>  <a href="arytm_3.html#K13">{}</a> 
 ;<br/><div class="add"><a NAME="E2:60_1_2_4_2_1"/><b>then </b>
<font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#R1">=</a> <a href="arytm_3.html#K13">{}</a>  <a href="arytm_3.html#K12">*'</a> <a href="arytm_3.html#K13">{}</a> 
 <b>by </b><i><a class="ref" href="arytm_3.html#T54">ARYTM_3:54</a></i>;<br/><a NAME="E3:60_1_2_4_2_1"/><b>then </b>
<font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Olive">b<sub>2</sub></font></span>)</span> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> , B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : ( <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> &amp; <font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>11</sub></font> ) </span>}</span> 
 <b>by </b><i><a class="txt" href="arytm_2.html#E7:60_1_2"><i><font color="Green">E61</font></i></a>, <a class="txt" href="arytm_2.html#E14:60_1_2"><i><font color="Green">E64</font></i></a></i>;<br/><b>hence </b><a NAME="E4:60_1_2_4_2_1"/>
<font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> <a href="arytm_2.html#K6" target="_self">*'</a> <font color="Maroon">c<sub>11</sub></font>
 ;<br/></div><b>end;</b></div><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="60_1_2_4_2_2"><b>suppose </b></a><a NAME="E1:60_1_2_4_2_2"/>
<font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="arytm_3.html#K13">{}</a> 
 ;<br/><div class="add"><b>then consider </b><font color="Maroon">c<sub>13</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E3:60_1_2_4_2_2"/><i><font color="Green">E71</font></i>: 
<font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>13</sub></font> <a href="hidden.html#R1">=</a>  <a href="arytm_3.html#K14">one</a> 
 <b>by </b><i><a class="ref" href="arytm_3.html#T61">ARYTM_3:61</a></i>;<br/><b>consider </b><font color="Maroon">c<sub>14</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E5:60_1_2_4_2_2"/><i><font color="Green">E72</font></i>: 
<font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#K11">+</a> <font color="Maroon">c<sub>14</sub></font> <a href="hidden.html#R1">=</a>  <a href="arytm_3.html#K14">one</a> 
 <b>by </b><i><a class="txt" href="arytm_2.html#E2:60_1_2_4"><i><font color="Green">E69</font></i></a>, <a class="ref" href="arytm_3.html#D13">ARYTM_3:def 13</a></i>;<br/><b>set </b><font color="Maroon">c<sub>15</sub></font> = <font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font>;<br/><b>consider </b><font color="Maroon">c<sub>16</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E7:60_1_2_4_2_2"/><i><font color="Green">E73</font></i>: 
not <font color="Maroon">c<sub>16</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font>
 <b>by </b><i><a class="txt" href="arytm_2.html#E2:60_1_2"><i><font color="Green">E59</font></i></a>, <a class="ref" href="subset_1.html#T49">SUBSET_1:49</a></i>;<br/><a NAME="E8:60_1_2_4_2_2"/>
<font color="Maroon">c<sub>14</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="arytm_3.html#K13">{}</a> 
 <b>by </b><i><a class="txt" href="arytm_2.html#E3:60_1_2_4"><i><font color="Green">E70</font></i></a>, <a class="txt" href="arytm_2.html#E5:60_1_2_4_2_2"><i><font color="Green">E72</font></i></a>, <a class="ref" href="arytm_3.html#T56">ARYTM_3:56</a></i>;<br/><a NAME="E9:60_1_2_4_2_2"/><b>then </b>
<font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="arytm_3.html#K13">{}</a> 
 <b>by </b><i><a class="txt" href="arytm_2.html#E19:60_1_2"><i><font color="Green">E67</font></i></a>, <a class="ref" href="arytm_3.html#T86">ARYTM_3:86</a></i>;<br/><b>then consider </b><font color="Maroon">c<sub>17</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E11:60_1_2_4_2_2"/><i><font color="Green">E74</font></i>: 
<font color="Maroon">c<sub>17</sub></font> <a href="hidden.html#R2">in</a>  <a href="ordinal1.html#K5">omega</a> 
 <b>and </b><br/><a NAME="E12:60_1_2_4_2_2"/><i><font color="Green">E75</font></i>: 
<font color="Maroon">c<sub>16</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>17</sub></font> <a href="arytm_3.html#K12">*'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font></span>)</span>
 <b>by </b><i><a class="ref" href="arytm_3.html#T103">ARYTM_3:103</a></i>;<br/><b>defpred </b><font color="Maroon">S<sub>1</sub></font>[   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> ] means <font color="Maroon">a<sub>1</sub></font> <a href="arytm_3.html#K12">*'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font></span>)</span> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font>;<br/><a NAME="E13:60_1_2_4_2_2"/><i><font color="Green">E76</font></i>: 
<font color="Maroon">S<sub>1</sub></font>[ <a href="arytm_3.html#K13">{}</a> ]
 <b>by </b><i><a class="txt" href="arytm_2.html#E14:60_1_2"><i><font color="Green">E64</font></i></a>, <a class="ref" href="arytm_3.html#T54">ARYTM_3:54</a></i>;<br/><a NAME="E14:60_1_2_4_2_2"/><i><font color="Green">E77</font></i>: 
 not <font color="Maroon">S<sub>1</sub></font>[<font color="Maroon">c<sub>17</sub></font>]
 <b>by </b><i><a class="txt" href="arytm_2.html#E10:60_1_2"><i><font color="Green">E62</font></i></a>, <a class="txt" href="arytm_2.html#E7:60_1_2_4_2_2"><i><font color="Green">E73</font></i></a>, <a class="txt" href="arytm_2.html#E12:60_1_2_4_2_2"><i><font color="Green">E75</font></i></a>, <a class="txt" href="arytm_2.html#E48"><i><font color="Green">Lemma39</font></i></a></i>;<br/><b>consider </b><font color="Maroon">c<sub>18</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E16:60_1_2_4_2_2"/>
<font color="Maroon">c<sub>18</sub></font> <a href="hidden.html#R2">in</a>  <a href="ordinal1.html#K5">omega</a> 
 <b>and </b><br/><a NAME="E17:60_1_2_4_2_2"/><i><font color="Green">E78</font></i>: 
<font color="Maroon">S<sub>1</sub></font>[<font color="Maroon">c<sub>18</sub></font>]
 <b>and </b><br/><a NAME="E18:60_1_2_4_2_2"/><i><font color="Green">E79</font></i>: 
 not <font color="Maroon">S<sub>1</sub></font>[<font color="Maroon">c<sub>18</sub></font> <a href="arytm_3.html#K11">+</a> <a href="arytm_3.html#K14">one</a> ]
 <b>from </b><i><a class="ref" href="arytm_3.html#S2">ARYTM_3:sch 2</a>(<a class="txt" href="arytm_2.html#E52"><i><font color="Green">Lemma42</font></i></a>, <a class="txt" href="arytm_2.html#E53"><i><font color="Green">Lemma43</font></i></a>, <a class="txt" href="arytm_2.html#E11:60_1_2_4_2_2"><i><font color="Green">E74</font></i></a>, <a class="txt" href="arytm_2.html#E13:60_1_2_4_2_2"><i><font color="Green">E76</font></i></a>, <a class="txt" href="arytm_2.html#E14:60_1_2_4_2_2"><i><font color="Green">E77</font></i></a>);<br/></i><a NAME="E19:60_1_2_4_2_2"/>
<span class="p1">{<span class="default"> <span class="p2">(<span class="default"><font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Olive">b<sub>1</sub></font></span>)</span> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> </span>}</span>  <a href="tarski.html#R1">c=</a>  <a href="arytm_3.html#K7">RAT+</a> 
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_1_2_4_2_2_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">c<sub>19</sub></font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a><br/>

<b>assume </b><a NAME="E1:60_1_2_4_2_2_1"/>
<font color="Maroon">c<sub>19</sub></font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Olive">b<sub>1</sub></font></span>)</span> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> </span>}</span> 
 ;<br/>

<a NAME="E2:60_1_2_4_2_2_1"/><b>then </b>
ex <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  st <br/>( <font color="Maroon">c<sub>19</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Olive">b<sub>1</sub></font> &amp; <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> )
 
;<br/>
<b>hence </b><a NAME="E3:60_1_2_4_2_2_1"/>
<font color="Maroon">c<sub>19</sub></font> <a href="hidden.html#R2">in</a>  <a href="arytm_3.html#K7">RAT+</a> 
 ;<br/>


</div><b>end;</b></div><b>then reconsider </b><font color="Maroon">c<sub>19</sub></font> = <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Olive">b<sub>1</sub></font></span>)</span> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> </span>}</span>  as   <a href="subset_1.html#NM2">Subset</a> of <a href="arytm_3.html#K7">RAT+</a>  ;<br/><div><i><font color="Green">E80</font></i>: <a class="txt" onclick="hs2(this)" href="javascript:()" title="60_1_2_4_2_2_2"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:60_1_2_4_2_2_2"/>
<font color="Maroon">c<sub>18</sub></font> <a href="arytm_3.html#K12">*'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font></span>)</span> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>19</sub></font>
 ;<br/><b>then consider </b><font color="Maroon">c<sub>20</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E3:60_1_2_4_2_2_2"/><i><font color="Green">E81</font></i>: 
<font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>20</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>18</sub></font> <a href="arytm_3.html#K12">*'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font></span>)</span>
 <b>and </b><br/><a NAME="E4:60_1_2_4_2_2_2"/><i><font color="Green">E82</font></i>: 
<font color="Maroon">c<sub>20</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font>
 ;<br/><i><font color="Green">E83</font></i>: <span class="p1">(<span class="default"><font color="Maroon">c<sub>18</sub></font> <a href="arytm_3.html#K11">+</a> <a href="arytm_3.html#K14">one</a> </span>)</span> <a href="arytm_3.html#K12">*'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font></span>)</span> = 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>18</sub></font> <a href="arytm_3.html#K12">*'</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font></span>)</span></span>)</span> <a href="arytm_3.html#K11">+</a> <span class="p1">(<span class="default"><a href="arytm_3.html#K14">one</a>  <a href="arytm_3.html#K12">*'</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font></span>)</span></span>)</span>
<b>by </b><i><a class="ref" href="arytm_3.html#T63">ARYTM_3:63</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>20</sub></font></span>)</span> <a href="arytm_3.html#K11">+</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>14</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>9</sub></font></span>)</span>
<b>by </b><i><a class="txt" href="arytm_2.html#E3:60_1_2_4_2_2_2"><i><font color="Green">E81</font></i></a>, <a class="ref" href="arytm_3.html#T59">ARYTM_3:59</a></i>
;<br/><a NAME="E6:60_1_2_4_2_2_2"/>
( <font color="Maroon">c<sub>20</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>9</sub></font> or <font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>20</sub></font> )
 ;<br/><b>then consider </b><font color="Maroon">c<sub>21</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E8:60_1_2_4_2_2_2"/><i><font color="Green">E84</font></i>: 
( ( <font color="Maroon">c<sub>21</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>20</sub></font> &amp; <font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>21</sub></font> ) or ( <font color="Maroon">c<sub>21</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>9</sub></font> &amp; <font color="Maroon">c<sub>20</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>21</sub></font> ) )
 ;<br/><a NAME="E9:60_1_2_4_2_2_2"/>
<font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>20</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>21</sub></font>
 <b>by </b><i><a class="txt" href="arytm_2.html#E8:60_1_2_4_2_2_2"><i><font color="Green">E84</font></i></a>, <a class="ref" href="arytm_3.html#T90">ARYTM_3:90</a></i>;<br/><a NAME="E10:60_1_2_4_2_2_2"/><b>then </b><i><font color="Green">E85</font></i>: 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>20</sub></font></span>)</span> <a href="arytm_3.html#K11">+</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>14</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>9</sub></font></span>)</span> <a href="arytm_3.html#R3">&lt;='</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>21</sub></font></span>)</span> <a href="arytm_3.html#K11">+</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>14</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>9</sub></font></span>)</span>
 <b>by </b><i><a class="ref" href="arytm_3.html#T83">ARYTM_3:83</a></i>;<br/><a NAME="E11:60_1_2_4_2_2_2"/>
<font color="Maroon">c<sub>14</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">c<sub>14</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>21</sub></font>
 <b>by </b><i><a class="txt" href="arytm_2.html#E8:60_1_2_4_2_2_2"><i><font color="Green">E84</font></i></a>, <a class="ref" href="arytm_3.html#T90">ARYTM_3:90</a></i>;<br/><a NAME="E12:60_1_2_4_2_2_2"/><b>then </b><i><font color="Green">E86</font></i>: 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>21</sub></font></span>)</span> <a href="arytm_3.html#K11">+</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>14</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>9</sub></font></span>)</span> <a href="arytm_3.html#R3">&lt;='</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>21</sub></font></span>)</span> <a href="arytm_3.html#K11">+</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>14</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>21</sub></font></span>)</span>
 <b>by </b><i><a class="ref" href="arytm_3.html#T83">ARYTM_3:83</a></i>;<br/><span class="p1">(<span class="default"><font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>21</sub></font></span>)</span> <a href="arytm_3.html#K11">+</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>14</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>21</sub></font></span>)</span> = 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#K11">+</a> <font color="Maroon">c<sub>14</sub></font></span>)</span> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>21</sub></font>
<b>by </b><i><a class="ref" href="arytm_3.html#T63">ARYTM_3:63</a></i>
<br/>.= 
<font color="Maroon">c<sub>21</sub></font>
<b>by </b><i><a class="txt" href="arytm_2.html#E5:60_1_2_4_2_2"><i><font color="Green">E72</font></i></a>, <a class="ref" href="arytm_3.html#T59">ARYTM_3:59</a></i>
;<br/><b>hence </b><a NAME="E14:60_1_2_4_2_2_2"/>
contradiction
 <b>by </b><i><a class="txt" href="arytm_2.html#E10:60_1_2"><i><font color="Green">E62</font></i></a>, <a class="txt" href="arytm_2.html#E18:60_1_2"><i><font color="Green">E66</font></i></a>, <a class="txt" href="arytm_2.html#E18:60_1_2_4_2_2"><i><font color="Green">E79</font></i></a>, <a class="txt" href="arytm_2.html#E4:60_1_2_4_2_2_2"><i><font color="Green">E82</font></i></a>, <a class="txt" href="arytm_2.html#E5:60_1_2_4_2_2_2"><i><font color="Green">E83</font></i></a>, <a class="txt" href="arytm_2.html#E8:60_1_2_4_2_2_2"><i><font color="Green">E84</font></i></a>, <a class="txt" href="arytm_2.html#E10:60_1_2_4_2_2_2"><i><font color="Green">E85</font></i></a>, <a class="txt" href="arytm_2.html#E12:60_1_2_4_2_2_2"><i><font color="Green">E86</font></i></a>, <a class="txt" href="arytm_2.html#E48"><i><font color="Green">Lemma39</font></i></a></i>;<br/></div><b>end;</b></div><b>set </b><font color="Maroon">c<sub>20</sub></font> = <font color="Maroon">c<sub>18</sub></font> <a href="arytm_3.html#K12">*'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font></span>)</span>;<br/><a NAME="E22:60_1_2_4_2_2"/>
<font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#K12">*'</a> <a href="arytm_3.html#K13">{}</a>  <a href="hidden.html#R1">=</a>  <a href="arytm_3.html#K13">{}</a> 
 <b>by </b><i><a class="ref" href="arytm_3.html#T54">ARYTM_3:54</a></i>;<br/><a NAME="E23:60_1_2_4_2_2"/><b>then </b>
 <a href="arytm_3.html#K13">{}</a>  <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>19</sub></font>
 <b>by </b><i><a class="txt" href="arytm_2.html#E14:60_1_2"><i><font color="Green">E64</font></i></a></i>;<br/><b>then consider </b><font color="Maroon">c<sub>21</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> <b> such that </b><br/><a NAME="E25:60_1_2_4_2_2"/><i><font color="Green">E81</font></i>: 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>18</sub></font> <a href="arytm_3.html#K12">*'</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font></span>)</span></span>)</span> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>21</sub></font> <a href="hidden.html#R1">=</a>  <a href="arytm_3.html#K14">one</a> 
 <b>by </b><i><a class="txt" href="arytm_2.html#E21:60_1_2_4_2_2"><i><font color="Green">E80</font></i></a>, <a class="ref" href="arytm_3.html#T61">ARYTM_3:61</a></i>;<br/><div><i><font color="Green">E82</font></i>: <a class="txt" onclick="hs2(this)" href="javascript:()" title="60_1_2_4_2_2_3"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:60_1_2_4_2_2_3"/><i><font color="Green">E83</font></i>: 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>18</sub></font> <a href="arytm_3.html#K12">*'</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font></span>)</span></span>)</span> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>13</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font>
 ;<br/><font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#K12">*'</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>18</sub></font> <a href="arytm_3.html#K12">*'</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font></span>)</span></span>)</span> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>13</sub></font></span>)</span> = 
<a href="arytm_3.html#K14">one</a>  <a href="arytm_3.html#K12">*'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>18</sub></font> <a href="arytm_3.html#K12">*'</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font></span>)</span></span>)</span>
<b>by </b><i><a class="txt" href="arytm_2.html#E3:60_1_2_4_2_2"><i><font color="Green">E71</font></i></a>, <a class="ref" href="arytm_3.html#T58">ARYTM_3:58</a></i>
<br/>.= 
<font color="Maroon">c<sub>18</sub></font> <a href="arytm_3.html#K12">*'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="arytm_3.html#T59">ARYTM_3:59</a></i>
;<br/><b>hence </b><a NAME="E3:60_1_2_4_2_2_3"/>
contradiction
 <b>by </b><i><a class="txt" href="arytm_2.html#E21:60_1_2_4_2_2"><i><font color="Green">E80</font></i></a>, <a class="txt" href="arytm_2.html#E1:60_1_2_4_2_2_3"><i><font color="Green">E83</font></i></a></i>;<br/></div><b>end;</b></div><span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>18</sub></font> <a href="arytm_3.html#K12">*'</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font></span>)</span></span>)</span> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>13</sub></font></span>)</span> <a href="arytm_3.html#K12">*'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>21</sub></font></span>)</span> = 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>18</sub></font> <a href="arytm_3.html#K12">*'</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font></span>)</span></span>)</span> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>13</sub></font></span>)</span> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>12</sub></font></span>)</span> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>21</sub></font>
<b>by </b><i><a class="ref" href="arytm_3.html#T58">ARYTM_3:58</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>18</sub></font> <a href="arytm_3.html#K12">*'</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font></span>)</span></span>)</span> <a href="arytm_3.html#K12">*'</a> <a href="arytm_3.html#K14">one</a> </span>)</span> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>21</sub></font>
<b>by </b><i><a class="txt" href="arytm_2.html#E3:60_1_2_4_2_2"><i><font color="Green">E71</font></i></a>, <a class="ref" href="arytm_3.html#T58">ARYTM_3:58</a></i>
<br/>.= 
 <a href="arytm_3.html#K14">one</a> 
<b>by </b><i><a class="txt" href="arytm_2.html#E25:60_1_2_4_2_2"><i><font color="Green">E81</font></i></a>, <a class="ref" href="arytm_3.html#T59">ARYTM_3:59</a></i>
;<br/><a NAME="E28:60_1_2_4_2_2"/><b>then </b>
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>18</sub></font> <a href="arytm_3.html#K12">*'</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font></span>)</span></span>)</span> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>13</sub></font></span>)</span> <a href="arytm_3.html#K12">*'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>21</sub></font></span>)</span> <a href="arytm_3.html#R3">&lt;='</a>  <a href="arytm_3.html#K14">one</a> 
 ;<br/><a NAME="E29:60_1_2_4_2_2"/><b>then </b><i><font color="Green">E83</font></i>: 
<font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>21</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>11</sub></font>
 <b>by </b><i><a class="txt" href="arytm_2.html#E26:60_1_2_4_2_2"><i><font color="Green">E82</font></i></a></i>;<br/><span class="p1">(<span class="default"><font color="Maroon">c<sub>18</sub></font> <a href="arytm_3.html#K12">*'</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font></span>)</span></span>)</span> <a href="arytm_3.html#K12">*'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>12</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>21</sub></font></span>)</span> = 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>18</sub></font> <a href="arytm_3.html#K12">*'</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>9</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>14</sub></font></span>)</span></span>)</span> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>21</sub></font></span>)</span> <a href="arytm_3.html#K12">*'</a> <font color="Maroon">c<sub>12</sub></font>
<b>by </b><i><a class="ref" href="arytm_3.html#T58">ARYTM_3:58</a></i>
<br/>.= 
<font color="Maroon">c<sub>12</sub></font>
<b>by </b><i><a class="txt" href="arytm_2.html#E25:60_1_2_4_2_2"><i><font color="Green">E81</font></i></a>, <a class="ref" href="arytm_3.html#T59">ARYTM_3:59</a></i>
;<br/><a NAME="E31:60_1_2_4_2_2"/><b>then </b>
<font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><font color="Olive">b<sub>1</sub></font> <a href="arytm_3.html#K12">*'</a> <font color="Olive">b<sub>2</sub></font></span>)</span> where B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> , B is    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  : ( <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> &amp; <font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>11</sub></font> ) </span>}</span> 
 <b>by </b><i><a class="txt" href="arytm_2.html#E17:60_1_2_4_2_2"><i><font color="Green">E78</font></i></a>, <a class="txt" href="arytm_2.html#E29:60_1_2_4_2_2"><i><font color="Green">E83</font></i></a></i>;<br/><b>hence </b><a NAME="E32:60_1_2_4_2_2"/>
<font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> <a href="arytm_2.html#K6" target="_self">*'</a> <font color="Maroon">c<sub>11</sub></font>
 ;<br/></div><b>end;</b></div></div><b>end;</b></div>

</div><b>end;</b></div><a NAME="E27:60_1_2"/><b>then </b>
 <a href="arytm_2.html#K3" target="_self">DEDEKIND_CUT</a> <span class="p1">(<span class="default"><a href="arytm_2.html#K4" target="_self">GLUED</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="arytm_2.html#K6" target="_self">*'</a> <font color="Maroon">c<sub>11</sub></font></span>)</span></span>)</span> <a href="hidden.html#R1">=</a>  <a href="arytm_2.html#K3" target="_self">DEDEKIND_CUT</a> <font color="Maroon">c<sub>3</sub></font>
 <b>by </b><i><a class="ref" href="arytm_2.html#D4" target="_self">Def4</a></i>;<br/><b>hence </b><a NAME="E28:60_1_2"/>
<font color="Maroon">c<sub>4</sub></font> <a href="arytm_2.html#K6" target="_self">*'</a> <font color="Maroon">c<sub>11</sub></font> <a href="hidden.html#R1">=</a>  <a href="arytm_2.html#K3" target="_self">DEDEKIND_CUT</a> <font color="Maroon">c<sub>3</sub></font>
 <b>by </b><i><a class="txt" href="arytm_2.html#E21"><i><font color="Green">Lemma16</font></i></a></i>;<br/></div><b>end;</b></div></div><b>end;</b></div>

</div>
