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

<b>let </b><font color="Maroon">c<sub>1</sub></font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font>, <font color="Maroon">c<sub>3</sub></font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">c<sub>4</sub></font>, <font color="Maroon">c<sub>5</sub></font> be   <a href="binop_1.html#NM2">BinOp</a> of <font color="Maroon">c<sub>1</sub></font>;<br/><b>let </b><font color="Maroon">c<sub>6</sub></font> be   <a href="funct_2.html#NM1">Function</a> of <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>1</sub></font>;<br/><b>let </b><font color="Maroon">c<sub>7</sub></font> be   <a href="funct_2.html#NM1">Function</a> of <font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>1</sub></font>;<br/><b>let </b><font color="Maroon">c<sub>8</sub></font> be    <a href="subset_1.html#M1">Element</a> of  <a href="finsub_1.html#K5">Fin</a> <font color="Maroon">c<sub>2</sub></font>;<br/><b>let </b><font color="Maroon">c<sub>9</sub></font> be    <a href="subset_1.html#M1">Element</a> of  <a href="finsub_1.html#K5">Fin</a> <font color="Maroon">c<sub>3</sub></font>;<br/>













<b>assume </b><a NAME="E1:35"/><i><font color="Green">E17</font></i>: 
( <font color="Maroon">c<sub>4</sub></font> is <a href="binop_1.html#V1">commutative</a> &amp; <font color="Maroon">c<sub>4</sub></font> is <a href="binop_1.html#V2">associative</a> &amp; <font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#NR1" target="_self">has_a_unity</a>  &amp; <font color="Maroon">c<sub>4</sub></font> <a href="finseqop.html#NR2" target="_self">has_an_inverseOp</a>  &amp; <font color="Maroon">c<sub>5</sub></font> <a href="binop_1.html#R6">is_distributive_wrt</a> <font color="Maroon">c<sub>4</sub></font> )
 ;<br/>

<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="35_1"><b>now </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 <font color="Maroon">c<sub>2</sub></font>;<br/><b>defpred </b><font color="Maroon">S<sub>1</sub></font>[   <a href="subset_1.html#M1">Element</a> of  <a href="finsub_1.html#K5">Fin</a> <font color="Maroon">c<sub>3</sub></font>] means <font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <span class="p1"><a href="matrix_3.html#K8" target="_self">[:</a><span class="default"><span class="p2"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Maroon">c<sub>10</sub></font></span><a href="setwiseo.html#K2">.}</a></span>,<font color="Maroon">a<sub>1</sub></font></span><a href="matrix_3.html#K8" target="_self">:]</a></span>,<span class="p1">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="matrix_3.html#K9" target="_self">*</a> <font color="Maroon">c<sub>6</sub></font>,<font color="Maroon">c<sub>7</sub></font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <span class="p1"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Maroon">c<sub>10</sub></font></span><a href="setwiseo.html#K2">.}</a></span>,<span class="p1">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="funcop_1.html#K7">[:]</a> <font color="Maroon">c<sub>6</sub></font>,<span class="p2">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <font color="Maroon">a<sub>1</sub></font>,<font color="Maroon">c<sub>7</sub></font></span>)</span></span>)</span>;<br/><a NAME="E1:35_1"/><i><font color="Green">E18</font></i>: 
<font color="Maroon">S<sub>1</sub></font>[ <a href="setwiseo.html#K1">{}.</a> <font color="Maroon">c<sub>3</sub></font>]
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="35_1_1"><b>proof </b></a><div class="add">

<b>reconsider </b><font color="Maroon">c<sub>11</sub></font> =  <a href="setwiseo.html#K1">{}.</a> <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font></span><a href="zfmisc_1.html#K2">:]</a></span> as    <a href="subset_1.html#M1">Element</a> of  <a href="finsub_1.html#K5">Fin</a> <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font></span><a href="zfmisc_1.html#K2">:]</a></span> ;<br/>
<a NAME="E2:35_1_1"/><i><font color="Green">E19</font></i>: 
<font color="Maroon">c<sub>11</sub></font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><span class="p2"><a href="tarski.html#K1">{</a><span class="default"><font color="Maroon">c<sub>10</sub></font></span><a href="tarski.html#K1">}</a></span>,<span class="p2">(<span class="default"><a href="setwiseo.html#K1">{}.</a> <font color="Maroon">c<sub>3</sub></font></span>)</span></span><a href="zfmisc_1.html#K2">:]</a></span>
 
<b>by </b><i><a class="ref" href="zfmisc_1.html#T113">ZFMISC_1:113</a></i>;<br/>
<a NAME="E3:35_1_1"/><i><font color="Green">E20</font></i>: 
 <a href="relat_1.html#K1">dom</a> <font color="Maroon">c<sub>6</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="ref" href="funct_2.html#D1">FUNCT_2:def 1</a></i>;<br/>
<b>set </b><font color="Maroon">c<sub>12</sub></font> =  <a href="binop_1.html#K3">the_unity_wrt</a> <font color="Maroon">c<sub>4</sub></font>;<br/>
 <a href="relat_1.html#K1">dom</a> <span class="p1"><a href="funct_3.html#K13">&lt;:</a><span class="default"><font color="Maroon">c<sub>6</sub></font>,<span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="relat_1.html#K1">dom</a> <font color="Maroon">c<sub>6</sub></font></span>)</span> <a href="funcop_1.html#K2">--&gt;</a> <span class="p3">(<span class="default"><a href="binop_1.html#K3">the_unity_wrt</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span></span><a href="funct_3.html#K13">:&gt;</a></span> = 
<span class="p1">(<span class="default"><a href="relat_1.html#K1">dom</a> <font color="Maroon">c<sub>6</sub></font></span>)</span> <a href="xboole_0.html#K3">/\</a> <span class="p1">(<span class="default"><a href="relat_1.html#K1">dom</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="relat_1.html#K1">dom</a> <font color="Maroon">c<sub>6</sub></font></span>)</span> <a href="funcop_1.html#K2">--&gt;</a> <span class="p3">(<span class="default"><a href="binop_1.html#K3">the_unity_wrt</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span></span>)</span>
<b>by </b><i><a class="ref" href="funct_3.html#D8">FUNCT_3:def 8</a></i>
<br/>.= 
<span class="p1">(<span class="default"><a href="relat_1.html#K1">dom</a> <font color="Maroon">c<sub>6</sub></font></span>)</span> <a href="xboole_0.html#K3">/\</a> <span class="p1">(<span class="default"><a href="relat_1.html#K1">dom</a> <font color="Maroon">c<sub>6</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="funcop_1.html#T19">FUNCOP_1:19</a></i>
<br/>.= 
 <a href="relat_1.html#K1">dom</a> <font color="Maroon">c<sub>6</sub></font>

;<br/>
<a NAME="E5:35_1_1"/><b>then </b><i><font color="Green">E21</font></i>: 
<font color="Maroon">c<sub>10</sub></font> <a href="hidden.html#R2">in</a>  <a href="relat_1.html#K1">dom</a> <span class="p1"><a href="funct_3.html#K13">&lt;:</a><span class="default"><font color="Maroon">c<sub>6</sub></font>,<span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="relat_1.html#K1">dom</a> <font color="Maroon">c<sub>6</sub></font></span>)</span> <a href="funcop_1.html#K2">--&gt;</a> <span class="p3">(<span class="default"><a href="binop_1.html#K3">the_unity_wrt</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span></span><a href="funct_3.html#K13">:&gt;</a></span>
 
<b>by </b><i><a class="txt" href="matrix_3.html#E3:35_1_1"><i><font color="Green">E20</font></i></a></i>;<br/>
<a NAME="E6:35_1_1"/><i><font color="Green">E22</font></i>: 
 <a href="relat_1.html#K2">rng</a> <font color="Maroon">c<sub>6</sub></font> <a href="tarski.html#R1">c=</a> <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="ref" href="relset_1.html#T12">RELSET_1:12</a></i>;<br/>
<a NAME="E7:35_1_1"/><i><font color="Green">E23</font></i>: 
<span class="p1"><a href="tarski.html#K1">{</a><span class="default"><span class="p2">(<span class="default"><a href="binop_1.html#K3">the_unity_wrt</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span><a href="tarski.html#K1">}</a></span> <a href="tarski.html#R1">c=</a> <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="ref" href="zfmisc_1.html#T37">ZFMISC_1:37</a></i>;<br/>
<a NAME="E8:35_1_1"/>
 <a href="relat_1.html#K2">rng</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="relat_1.html#K1">dom</a> <font color="Maroon">c<sub>6</sub></font></span>)</span> <a href="funcop_1.html#K2">--&gt;</a> <span class="p2">(<span class="default"><a href="binop_1.html#K3">the_unity_wrt</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span> <a href="tarski.html#R1">c=</a> <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><span class="p2">(<span class="default"><a href="binop_1.html#K3">the_unity_wrt</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span><a href="tarski.html#K1">}</a></span>
 
<b>by </b><i><a class="ref" href="funcop_1.html#T19">FUNCOP_1:19</a></i>;<br/>
<a NAME="E9:35_1_1"/><b>then </b><i><font color="Green">E24</font></i>: 
 <a href="relat_1.html#K2">rng</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="relat_1.html#K1">dom</a> <font color="Maroon">c<sub>6</sub></font></span>)</span> <a href="funcop_1.html#K2">--&gt;</a> <span class="p2">(<span class="default"><a href="binop_1.html#K3">the_unity_wrt</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span> <a href="tarski.html#R1">c=</a> <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="txt" href="matrix_3.html#E7:35_1_1"><i><font color="Green">E23</font></i></a>, <a class="ref" href="xboole_1.html#T1">XBOOLE_1:1</a></i>;<br/>
<a NAME="E10:35_1_1"/><i><font color="Green">E25</font></i>: 
 <a href="relat_1.html#K1">dom</a> <font color="Maroon">c<sub>5</sub></font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>1</sub></font></span><a href="zfmisc_1.html#K2">:]</a></span>
 
<b>by </b><i><a class="ref" href="funct_2.html#D1">FUNCT_2:def 1</a></i>;<br/>
<a NAME="E11:35_1_1"/><i><font color="Green">E26</font></i>: 
 <a href="relat_1.html#K2">rng</a> <span class="p1"><a href="funct_3.html#K13">&lt;:</a><span class="default"><font color="Maroon">c<sub>6</sub></font>,<span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="relat_1.html#K1">dom</a> <font color="Maroon">c<sub>6</sub></font></span>)</span> <a href="funcop_1.html#K2">--&gt;</a> <span class="p3">(<span class="default"><a href="binop_1.html#K3">the_unity_wrt</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span></span><a href="funct_3.html#K13">:&gt;</a></span> <a href="tarski.html#R1">c=</a> <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><span class="p2">(<span class="default"><a href="relat_1.html#K2">rng</a> <font color="Maroon">c<sub>6</sub></font></span>)</span>,<span class="p2">(<span class="default"><a href="relat_1.html#K2">rng</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><a href="relat_1.html#K1">dom</a> <font color="Maroon">c<sub>6</sub></font></span>)</span> <a href="funcop_1.html#K2">--&gt;</a> <span class="p4">(<span class="default"><a href="binop_1.html#K3">the_unity_wrt</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span></span>)</span></span><a href="zfmisc_1.html#K2">:]</a></span>
 
<b>by </b><i><a class="ref" href="funct_3.html#T71">FUNCT_3:71</a></i>;<br/>
<a NAME="E12:35_1_1"/>
<span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><span class="p2">(<span class="default"><a href="relat_1.html#K2">rng</a> <font color="Maroon">c<sub>6</sub></font></span>)</span>,<span class="p2">(<span class="default"><a href="relat_1.html#K2">rng</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><a href="relat_1.html#K1">dom</a> <font color="Maroon">c<sub>6</sub></font></span>)</span> <a href="funcop_1.html#K2">--&gt;</a> <span class="p4">(<span class="default"><a href="binop_1.html#K3">the_unity_wrt</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span></span>)</span></span><a href="zfmisc_1.html#K2">:]</a></span> <a href="tarski.html#R1">c=</a> <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>1</sub></font></span><a href="zfmisc_1.html#K2">:]</a></span>
 
<b>by </b><i><a class="txt" href="matrix_3.html#E6:35_1_1"><i><font color="Green">E22</font></i></a>, <a class="txt" href="matrix_3.html#E9:35_1_1"><i><font color="Green">E24</font></i></a>, <a class="ref" href="zfmisc_1.html#T119">ZFMISC_1:119</a></i>;<br/>
<a NAME="E13:35_1_1"/><b>then </b>
 <a href="relat_1.html#K2">rng</a> <span class="p1"><a href="funct_3.html#K13">&lt;:</a><span class="default"><font color="Maroon">c<sub>6</sub></font>,<span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="relat_1.html#K1">dom</a> <font color="Maroon">c<sub>6</sub></font></span>)</span> <a href="funcop_1.html#K2">--&gt;</a> <span class="p3">(<span class="default"><a href="binop_1.html#K3">the_unity_wrt</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span></span><a href="funct_3.html#K13">:&gt;</a></span> <a href="tarski.html#R1">c=</a>  <a href="relat_1.html#K1">dom</a> <font color="Maroon">c<sub>5</sub></font>
 
<b>by </b><i><a class="txt" href="matrix_3.html#E10:35_1_1"><i><font color="Green">E25</font></i></a>, <a class="txt" href="matrix_3.html#E11:35_1_1"><i><font color="Green">E26</font></i></a>, <a class="ref" href="xboole_1.html#T1">XBOOLE_1:1</a></i>;<br/>
<a NAME="E14:35_1_1"/><b>then </b>
<font color="Maroon">c<sub>10</sub></font> <a href="hidden.html#R2">in</a>  <a href="relat_1.html#K1">dom</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="funct_1.html#NK3" target="_self">*</a> <span class="p2"><a href="funct_3.html#K13">&lt;:</a><span class="default"><font color="Maroon">c<sub>6</sub></font>,<span class="p3">(<span class="default"><span class="p4">(<span class="default"><a href="relat_1.html#K1">dom</a> <font color="Maroon">c<sub>6</sub></font></span>)</span> <a href="funcop_1.html#K2">--&gt;</a> <span class="p4">(<span class="default"><a href="binop_1.html#K3">the_unity_wrt</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span></span><a href="funct_3.html#K13">:&gt;</a></span></span>)</span>
 
<b>by </b><i><a class="txt" href="matrix_3.html#E5:35_1_1"><i><font color="Green">E21</font></i></a>, <a class="ref" href="relat_1.html#T46">RELAT_1:46</a></i>;<br/>
<a NAME="E15:35_1_1"/><b>then </b><i><font color="Green">E27</font></i>: 
<font color="Maroon">c<sub>10</sub></font> <a href="hidden.html#R2">in</a>  <a href="relat_1.html#K1">dom</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="funcop_1.html#K7">[:]</a> <font color="Maroon">c<sub>6</sub></font>,<span class="p2">(<span class="default"><a href="binop_1.html#K3">the_unity_wrt</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span>
 
<b>by </b><i><a class="ref" href="funcop_1.html#D4">FUNCOP_1:def 4</a></i>;<br/>
<font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <span class="p1"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Maroon">c<sub>10</sub></font></span><a href="setwiseo.html#K2">.}</a></span>,<span class="p1">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="funcop_1.html#K7">[:]</a> <font color="Maroon">c<sub>6</sub></font>,<span class="p2">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <span class="p3">(<span class="default"><a href="setwiseo.html#K1">{}.</a> <font color="Maroon">c<sub>3</sub></font></span>)</span>,<font color="Maroon">c<sub>7</sub></font></span>)</span></span>)</span> = 
<font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <span class="p1"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Maroon">c<sub>10</sub></font></span><a href="setwiseo.html#K2">.}</a></span>,<span class="p1">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="funcop_1.html#K7">[:]</a> <font color="Maroon">c<sub>6</sub></font>,<span class="p2">(<span class="default"><a href="binop_1.html#K3">the_unity_wrt</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span>
<b>by </b><i><a class="txt" href="matrix_3.html#E1:35"><i><font color="Green">E17</font></i></a>, <a class="ref" href="setwiseo.html#T40">SETWISEO:40</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="funcop_1.html#K7">[:]</a> <font color="Maroon">c<sub>6</sub></font>,<span class="p2">(<span class="default"><a href="binop_1.html#K3">the_unity_wrt</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span> <a href="funct_2.html#K3">.</a> <font color="Maroon">c<sub>10</sub></font>
<b>by </b><i><a class="txt" href="matrix_3.html#E1:35"><i><font color="Green">E17</font></i></a>, <a class="ref" href="setwiseo.html#T26">SETWISEO:26</a></i>
<br/>.= 
<font color="Maroon">c<sub>5</sub></font> <a href="binop_1.html#K2">.</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>6</sub></font> <a href="funct_2.html#K3">.</a> <font color="Maroon">c<sub>10</sub></font></span>)</span>,<span class="p1">(<span class="default"><a href="binop_1.html#K3">the_unity_wrt</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>
<b>by </b><i><a class="txt" href="matrix_3.html#E15:35_1_1"><i><font color="Green">E27</font></i></a>, <a class="ref" href="funcop_1.html#T35">FUNCOP_1:35</a></i>
<br/>.= 
 <a href="binop_1.html#K3">the_unity_wrt</a> <font color="Maroon">c<sub>4</sub></font>
<b>by </b><i><a class="txt" href="matrix_3.html#E1:35"><i><font color="Green">E17</font></i></a>, <a class="ref" href="finseqop.html#T70">FINSEQOP:70</a></i>
;<br/>
<b>hence </b><a NAME="E17:35_1_1"/>
<font color="Maroon">S<sub>1</sub></font>[ <a href="setwiseo.html#K1">{}.</a> <font color="Maroon">c<sub>3</sub></font>]
 <b>by </b><i><a class="txt" href="matrix_3.html#E1:35"><i><font color="Green">E17</font></i></a>, <a class="txt" href="matrix_3.html#E2:35_1_1"><i><font color="Green">E19</font></i></a>, <a class="ref" href="setwiseo.html#T40">SETWISEO:40</a></i>;<br/>


</div><b>end;</b></div><a NAME="E2:35_1"/><i><font color="Green">E19</font></i>: 
for <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="finsub_1.html#K5">Fin</a> <font color="Maroon">c<sub>3</sub></font><br/>for <font color="Olive">b<sub>2</sub></font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">c<sub>3</sub></font> st <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">b<sub>1</sub></font>] holds <br/><font color="Maroon">S<sub>1</sub></font>[<font color="Olive">b<sub>1</sub></font> <a href="finsub_1.html#K1">\/</a> <span class="p1"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Olive">b<sub>2</sub></font></span><a href="setwiseo.html#K2">.}</a></span>]
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="35_1_2"><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="finsub_1.html#K5">Fin</a> <font color="Maroon">c<sub>3</sub></font>;<br/><b>let </b><font color="Maroon">c<sub>12</sub></font> be    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">c<sub>3</sub></font>;<br/>



<b>assume </b><a NAME="E1:35_1_2"/><i><font color="Green">E20</font></i>: 
<font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <span class="p1"><a href="matrix_3.html#K8" target="_self">[:</a><span class="default"><span class="p2"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Maroon">c<sub>10</sub></font></span><a href="setwiseo.html#K2">.}</a></span>,<font color="Maroon">c<sub>11</sub></font></span><a href="matrix_3.html#K8" target="_self">:]</a></span>,<span class="p1">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="matrix_3.html#K9" target="_self">*</a> <font color="Maroon">c<sub>6</sub></font>,<font color="Maroon">c<sub>7</sub></font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <span class="p1"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Maroon">c<sub>10</sub></font></span><a href="setwiseo.html#K2">.}</a></span>,<span class="p1">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="funcop_1.html#K7">[:]</a> <font color="Maroon">c<sub>6</sub></font>,<span class="p2">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <font color="Maroon">c<sub>11</sub></font>,<font color="Maroon">c<sub>7</sub></font></span>)</span></span>)</span>
 ;<br/>

<b>reconsider </b><font color="Maroon">c<sub>13</sub></font> = <span class="p1"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Maroon">c<sub>12</sub></font></span><a href="setwiseo.html#K2">.}</a></span> as    <a href="subset_1.html#M1">Element</a> of  <a href="finsub_1.html#K5">Fin</a> <font color="Maroon">c<sub>3</sub></font> ;<br/>
<div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="35_1_2_1"><b>per </b></a><a class="txt" onclick="hs(this)" href="javascript:()"><b>cases </b></a><span class="hide"><a NAME="E1:35_1_2_1"/>
( <font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>11</sub></font> or  not <font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>11</sub></font> )
 </span>;<br/><div class="add"><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="35_1_2_1_1"><b>suppose </b></a><a NAME="E1:35_1_2_1_1"/>
<font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>11</sub></font>
 ;<br/><div class="add"><a NAME="E2:35_1_2_1_1"/><b>then </b>
<font color="Maroon">c<sub>11</sub></font> <a href="xboole_0.html#K2">\/</a> <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><font color="Maroon">c<sub>12</sub></font></span><a href="tarski.html#K1">}</a></span> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>11</sub></font>
 <b>by </b><i><a class="ref" href="zfmisc_1.html#T46">ZFMISC_1:46</a></i>;<br/><b>hence </b><a NAME="E3:35_1_2_1_1"/>
<font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <span class="p1"><a href="matrix_3.html#K8" target="_self">[:</a><span class="default"><span class="p2"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Maroon">c<sub>10</sub></font></span><a href="setwiseo.html#K2">.}</a></span>,<span class="p2">(<span class="default"><font color="Maroon">c<sub>11</sub></font> <a href="finsub_1.html#K1">\/</a> <span class="p3"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Maroon">c<sub>12</sub></font></span><a href="setwiseo.html#K2">.}</a></span></span>)</span></span><a href="matrix_3.html#K8" target="_self">:]</a></span>,<span class="p1">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="matrix_3.html#K9" target="_self">*</a> <font color="Maroon">c<sub>6</sub></font>,<font color="Maroon">c<sub>7</sub></font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <span class="p1"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Maroon">c<sub>10</sub></font></span><a href="setwiseo.html#K2">.}</a></span>,<span class="p1">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="funcop_1.html#K7">[:]</a> <font color="Maroon">c<sub>6</sub></font>,<span class="p2">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>11</sub></font> <a href="finsub_1.html#K1">\/</a> <span class="p4"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Maroon">c<sub>12</sub></font></span><a href="setwiseo.html#K2">.}</a></span></span>)</span>,<font color="Maroon">c<sub>7</sub></font></span>)</span></span>)</span>
 <b>by </b><i><a class="txt" href="matrix_3.html#E1:35_1_2"><i><font color="Green">E20</font></i></a></i>;<br/></div><b>end;</b></div><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="35_1_2_1_2"><b>suppose </b></a><a NAME="E1:35_1_2_1_2"/>
not <font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>11</sub></font>
 ;<br/><div class="add"><a NAME="E2:35_1_2_1_2"/><b>then </b><i><font color="Green">E21</font></i>: 
<font color="Maroon">c<sub>11</sub></font> <a href="xboole_0.html#R1">misses</a> <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><font color="Maroon">c<sub>12</sub></font></span><a href="tarski.html#K1">}</a></span>
 <b>by </b><i><a class="ref" href="zfmisc_1.html#T56">ZFMISC_1:56</a></i>;<br/><a NAME="E3:35_1_2_1_2"/><b>then </b><i><font color="Green">E22</font></i>: 
<span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><span class="p2"><a href="tarski.html#K1">{</a><span class="default"><font color="Maroon">c<sub>10</sub></font></span><a href="tarski.html#K1">}</a></span>,<font color="Maroon">c<sub>11</sub></font></span><a href="zfmisc_1.html#K2">:]</a></span> <a href="xboole_0.html#R1">misses</a> <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><span class="p2"><a href="tarski.html#K1">{</a><span class="default"><font color="Maroon">c<sub>10</sub></font></span><a href="tarski.html#K1">}</a></span>,<font color="Maroon">c<sub>13</sub></font></span><a href="zfmisc_1.html#K2">:]</a></span>
 <b>by </b><i><a class="ref" href="zfmisc_1.html#T127">ZFMISC_1:127</a></i>;<br/><b>thus </b><font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <span class="p1"><a href="matrix_3.html#K8" target="_self">[:</a><span class="default"><span class="p2"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Maroon">c<sub>10</sub></font></span><a href="setwiseo.html#K2">.}</a></span>,<span class="p2">(<span class="default"><font color="Maroon">c<sub>11</sub></font> <a href="finsub_1.html#K1">\/</a> <span class="p3"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Maroon">c<sub>12</sub></font></span><a href="setwiseo.html#K2">.}</a></span></span>)</span></span><a href="matrix_3.html#K8" target="_self">:]</a></span>,<span class="p1">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="matrix_3.html#K9" target="_self">*</a> <font color="Maroon">c<sub>6</sub></font>,<font color="Maroon">c<sub>7</sub></font></span>)</span> = 
<font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <span class="p1">(<span class="default"><span class="p2"><a href="matrix_3.html#K8" target="_self">[:</a><span class="default"><span class="p3"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Maroon">c<sub>10</sub></font></span><a href="setwiseo.html#K2">.}</a></span>,<font color="Maroon">c<sub>11</sub></font></span><a href="matrix_3.html#K8" target="_self">:]</a></span> <a href="finsub_1.html#K1">\/</a> <span class="p2"><a href="matrix_3.html#K8" target="_self">[:</a><span class="default"><span class="p3"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Maroon">c<sub>10</sub></font></span><a href="setwiseo.html#K2">.}</a></span>,<font color="Maroon">c<sub>13</sub></font></span><a href="matrix_3.html#K8" target="_self">:]</a></span></span>)</span>,<span class="p1">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="matrix_3.html#K9" target="_self">*</a> <font color="Maroon">c<sub>6</sub></font>,<font color="Maroon">c<sub>7</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="zfmisc_1.html#T120">ZFMISC_1:120</a></i>
<br/>.= 
<font color="Maroon">c<sub>4</sub></font> <a href="binop_1.html#K2">.</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <span class="p2"><a href="matrix_3.html#K8" target="_self">[:</a><span class="default"><span class="p3"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Maroon">c<sub>10</sub></font></span><a href="setwiseo.html#K2">.}</a></span>,<font color="Maroon">c<sub>11</sub></font></span><a href="matrix_3.html#K8" target="_self">:]</a></span>,<span class="p2">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="matrix_3.html#K9" target="_self">*</a> <font color="Maroon">c<sub>6</sub></font>,<font color="Maroon">c<sub>7</sub></font></span>)</span></span>)</span>,<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <span class="p2"><a href="matrix_3.html#K8" target="_self">[:</a><span class="default"><span class="p3"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Maroon">c<sub>10</sub></font></span><a href="setwiseo.html#K2">.}</a></span>,<font color="Maroon">c<sub>13</sub></font></span><a href="matrix_3.html#K8" target="_self">:]</a></span>,<span class="p2">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="matrix_3.html#K9" target="_self">*</a> <font color="Maroon">c<sub>6</sub></font>,<font color="Maroon">c<sub>7</sub></font></span>)</span></span>)</span>
<b>by </b><i><a class="txt" href="matrix_3.html#E1:35"><i><font color="Green">E17</font></i></a>, <a class="txt" href="matrix_3.html#E3:35_1_2_1_2"><i><font color="Green">E22</font></i></a>, <a class="ref" href="setwop_2.html#T6">SETWOP_2:6</a></i>
<br/>.= 
<font color="Maroon">c<sub>4</sub></font> <a href="binop_1.html#K2">.</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <span class="p2"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Maroon">c<sub>10</sub></font></span><a href="setwiseo.html#K2">.}</a></span>,<span class="p2">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="funcop_1.html#K7">[:]</a> <font color="Maroon">c<sub>6</sub></font>,<span class="p3">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <font color="Maroon">c<sub>11</sub></font>,<font color="Maroon">c<sub>7</sub></font></span>)</span></span>)</span></span>)</span>,<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <span class="p2"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Maroon">c<sub>10</sub></font></span><a href="setwiseo.html#K2">.}</a></span>,<span class="p2">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="funcop_1.html#K7">[:]</a> <font color="Maroon">c<sub>6</sub></font>,<span class="p3">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <font color="Maroon">c<sub>13</sub></font>,<font color="Maroon">c<sub>7</sub></font></span>)</span></span>)</span></span>)</span>
<b>by </b><i><a class="txt" href="matrix_3.html#E1:35"><i><font color="Green">E17</font></i></a>, <a class="txt" href="matrix_3.html#E1:35_1_2"><i><font color="Green">E20</font></i></a>, <a class="ref" href="matrix_3.html#T26" target="_self">Th26</a></i>
<br/>.= 
<font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <span class="p1"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Maroon">c<sub>10</sub></font></span><a href="setwiseo.html#K2">.}</a></span>,<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="funcop_1.html#K6">.:</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="funcop_1.html#K7">[:]</a> <font color="Maroon">c<sub>6</sub></font>,<span class="p3">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <font color="Maroon">c<sub>11</sub></font>,<font color="Maroon">c<sub>7</sub></font></span>)</span></span>)</span>,<span class="p2">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="funcop_1.html#K7">[:]</a> <font color="Maroon">c<sub>6</sub></font>,<span class="p3">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <font color="Maroon">c<sub>13</sub></font>,<font color="Maroon">c<sub>7</sub></font></span>)</span></span>)</span></span>)</span>
<b>by </b><i><a class="txt" href="matrix_3.html#E1:35"><i><font color="Green">E17</font></i></a>, <a class="ref" href="setwop_2.html#T12">SETWOP_2:12</a></i>
<br/>.= 
<font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <span class="p1"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Maroon">c<sub>10</sub></font></span><a href="setwiseo.html#K2">.}</a></span>,<span class="p1">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="funcop_1.html#K7">[:]</a> <font color="Maroon">c<sub>6</sub></font>,<span class="p2">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="binop_1.html#K2">.</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <font color="Maroon">c<sub>11</sub></font>,<font color="Maroon">c<sub>7</sub></font></span>)</span>,<span class="p3">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <font color="Maroon">c<sub>13</sub></font>,<font color="Maroon">c<sub>7</sub></font></span>)</span></span>)</span></span>)</span>
<b>by </b><i><a class="txt" href="matrix_3.html#E1:35"><i><font color="Green">E17</font></i></a>, <a class="ref" href="finseqop.html#T37">FINSEQOP:37</a></i>
<br/>.= 
<font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <span class="p1"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Maroon">c<sub>10</sub></font></span><a href="setwiseo.html#K2">.}</a></span>,<span class="p1">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="funcop_1.html#K7">[:]</a> <font color="Maroon">c<sub>6</sub></font>,<span class="p2">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>11</sub></font> <a href="finsub_1.html#K1">\/</a> <span class="p4"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Maroon">c<sub>12</sub></font></span><a href="setwiseo.html#K2">.}</a></span></span>)</span>,<font color="Maroon">c<sub>7</sub></font></span>)</span></span>)</span>
<b>by </b><i><a class="txt" href="matrix_3.html#E1:35"><i><font color="Green">E17</font></i></a>, <a class="txt" href="matrix_3.html#E2:35_1_2_1_2"><i><font color="Green">E21</font></i></a>, <a class="ref" href="setwop_2.html#T6">SETWOP_2:6</a></i>
;<br/></div><b>end;</b></div></div><b>end;</b></div>

</div><b>end;</b></div><b>thus </b><a NAME="E3:35_1"/>
for <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="finsub_1.html#K5">Fin</a> <font color="Maroon">c<sub>3</sub></font> holds <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">b<sub>1</sub></font>]
 <b>from </b><i><a class="ref" href="setwiseo.html#S4">SETWISEO:sch 4</a>(<a class="txt" href="matrix_3.html#E1:35_1"><i><font color="Green">E18</font></i></a>, <a class="txt" href="matrix_3.html#E2:35_1"><i><font color="Green">E19</font></i></a>);</i><br/></div><b>end;</b></div>
<b>hence </b><a NAME="E3:35"/>
for <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">c<sub>2</sub></font> holds <font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <span class="p1"><a href="matrix_3.html#K8" target="_self">[:</a><span class="default"><span class="p2"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Olive">b<sub>1</sub></font></span><a href="setwiseo.html#K2">.}</a></span>,<font color="Maroon">c<sub>9</sub></font></span><a href="matrix_3.html#K8" target="_self">:]</a></span>,<span class="p1">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="matrix_3.html#K9" target="_self">*</a> <font color="Maroon">c<sub>6</sub></font>,<font color="Maroon">c<sub>7</sub></font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <span class="p1"><a href="setwiseo.html#K2">{.</a><span class="default"><font color="Olive">b<sub>1</sub></font></span><a href="setwiseo.html#K2">.}</a></span>,<span class="p1">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="funcop_1.html#K7">[:]</a> <font color="Maroon">c<sub>6</sub></font>,<span class="p2">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="setwiseo.html#K7">$$</a> <font color="Maroon">c<sub>9</sub></font>,<font color="Maroon">c<sub>7</sub></font></span>)</span></span>)</span>
 ;<br/>


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