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

<b>let </b><font color="Maroon">R</font> be  non <a href="struct_0.html#V3">empty</a> <a href="group_1.html#V4">associative</a> <a href="group_1.html#V7">commutative</a> <a href="vectsp_1.html#V4">right-distributive</a> <a href="algstr_1.html#V1">left_zeroed</a> <a href="algstr_1.html#V3">add-right-cancelable</a>  <a href="vectsp_1.html#L3">doubleLoopStr</a> ;<br/><b>let </b><font color="Maroon">I</font> be  non <a href="xboole_0.html#V1">empty</a> <a href="ideal_1.html#V1" target="_self">add-closed</a> <a href="ideal_1.html#V3" target="_self">right-ideal</a> <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">R</font>;<br/><b>let </b><font color="Maroon">J</font> be   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">R</font>, <font color="Maroon">K</font> be   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">R</font>;<br/>





<div><i><font color="Green">E41</font></i>: <a class="txt" onclick="hs2(this)" href="javascript:()" title="144_1"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">u</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>assume </b><a NAME="E1:144_1"/>
<font color="Maroon">u</font> <a href="hidden.html#R2">in</a> <span class="p1">(<span class="default"><font color="Maroon">I</font> <a href="ideal_1.html#K16" target="_self">%</a> <font color="Maroon">J</font></span>)</span> <a href="ideal_1.html#K16" target="_self">%</a> <font color="Maroon">K</font>
 ;<br/><a NAME="E2:144_1"/><b>then </b>
<font color="Maroon">u</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <font color="Olive">a</font> where <font color="Olive">a</font> is   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font> : <font color="Olive">a</font> <a href="ideal_1.html#K10" target="_self">*</a> <font color="Maroon">K</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">I</font> <a href="ideal_1.html#K16" target="_self">%</a> <font color="Maroon">J</font> </span>}</span> 
 ;<br/><b>then consider </b><font color="Maroon">a</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font><b> such that </b><br/><a NAME="E4:144_1"/><i><font color="Green">E42</font></i>: 
( <font color="Maroon">u</font> <a href="hidden.html#R1">=</a> <font color="Maroon">a</font> &amp; <font color="Maroon">a</font> <a href="ideal_1.html#K10" target="_self">*</a> <font color="Maroon">K</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">I</font> <a href="ideal_1.html#K16" target="_self">%</a> <font color="Maroon">J</font> )
 ;<br/><div><a class="txt" onclick="hs2(this)" href="javascript:()" title="144_1_1"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">v</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>assume </b><a NAME="E1:144_1_1"/>
<font color="Maroon">v</font> <a href="hidden.html#R2">in</a> <font color="Maroon">a</font> <a href="ideal_1.html#K10" target="_self">*</a> <span class="p1">(<span class="default"><font color="Maroon">J</font> <a href="ideal_1.html#K15" target="_self">*'</a> <font color="Maroon">K</font></span>)</span>
 ;<br/><a NAME="E2:144_1_1"/><b>then </b>
<font color="Maroon">v</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><font color="Maroon">a</font> <a href="group_1.html#K10">*</a> <font color="Olive">b</font></span>)</span> where <font color="Olive">b</font> is   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font> : <font color="Olive">b</font> <a href="hidden.html#R2">in</a> <font color="Maroon">J</font> <a href="ideal_1.html#K15" target="_self">*'</a> <font color="Maroon">K</font> </span>}</span> 
 ;<br/><b>then consider </b><font color="Maroon">b</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font><b> such that </b><br/><a NAME="E4:144_1_1"/><i><font color="Green">E43</font></i>: 
( <font color="Maroon">v</font> <a href="hidden.html#R1">=</a> <font color="Maroon">a</font> <a href="group_1.html#K10">*</a> <font color="Maroon">b</font> &amp; <font color="Maroon">b</font> <a href="hidden.html#R2">in</a> <font color="Maroon">J</font> <a href="ideal_1.html#K15" target="_self">*'</a> <font color="Maroon">K</font> )
 ;<br/><a NAME="E5:144_1_1"/>
<font color="Maroon">b</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><a href="rlvect_1.html#K9">Sum</a> <font color="Olive">t</font></span>)</span> where <font color="Olive">t</font> is    <a href="finseq_1.html#M2">FinSequence</a> of the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">R</font> : for <font color="Olive">i</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>   st 1 <a href="xxreal_0.html#R1">&lt;=</a> <font color="Olive">i</font> &amp; <font color="Olive">i</font> <a href="xxreal_0.html#R1">&lt;=</a>  <a href="finseq_1.html#K3">len</a> <font color="Olive">t</font> holds <br/> ex <font color="Olive">a</font>, <font color="Olive">b</font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font> st <br/>( <font color="Olive">t</font> <a href="funct_1.html#K1">.</a> <font color="Olive">i</font> <a href="hidden.html#R1">=</a> <font color="Olive">a</font> <a href="group_1.html#K10">*</a> <font color="Olive">b</font> &amp; <font color="Olive">a</font> <a href="hidden.html#R2">in</a> <font color="Maroon">J</font> &amp; <font color="Olive">b</font> <a href="hidden.html#R2">in</a> <font color="Maroon">K</font> ) </span>}</span> 
 <b>by </b><i><a class="ref" href="ideal_1.html#T14" target="_self">Th14</a></i>;<br/><b>then consider </b><font color="Maroon">s</font> being    <a href="finseq_1.html#M2">FinSequence</a> of the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">R</font><b> such that </b><br/><a NAME="E7:144_1_1"/><i><font color="Green">E44</font></i>: 
(  <a href="rlvect_1.html#K9">Sum</a> <font color="Maroon">s</font> <a href="hidden.html#R1">=</a> <font color="Maroon">b</font> &amp; ( for <font color="Olive">i</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>   st 1 <a href="xxreal_0.html#R1">&lt;=</a> <font color="Olive">i</font> &amp; <font color="Olive">i</font> <a href="xxreal_0.html#R1">&lt;=</a>  <a href="finseq_1.html#K3">len</a> <font color="Maroon">s</font> holds <br/> ex <font color="Olive">a</font>, <font color="Olive">b</font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font> st <br/>( <font color="Maroon">s</font> <a href="funct_1.html#K1">.</a> <font color="Olive">i</font> <a href="hidden.html#R1">=</a> <font color="Olive">a</font> <a href="group_1.html#K10">*</a> <font color="Olive">b</font> &amp; <font color="Olive">a</font> <a href="hidden.html#R2">in</a> <font color="Maroon">J</font> &amp; <font color="Olive">b</font> <a href="hidden.html#R2">in</a> <font color="Maroon">K</font> ) ) )
 ;<br/><b>set </b><font color="Maroon">q</font> = <font color="Maroon">a</font> <a href="polynom1.html#K6">*</a> <font color="Maroon">s</font>;<br/><a NAME="E8:144_1_1"/><i><font color="Green">E72</font></i>: 
 <a href="relset_1.html#K4">dom</a> <span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="polynom1.html#K6">*</a> <font color="Maroon">s</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="relset_1.html#K4">dom</a> <font color="Maroon">s</font>
 <b>by </b><i><a class="ref" href="polynom1.html#D2">POLYNOM1:def 2</a></i>;<br/><i><font color="Green">E76</font></i>:  <a href="finseq_1.html#K2">Seg</a> <span class="p1">(<span class="default"><a href="finseq_1.html#K3">len</a> <span class="p2">(<span class="default"><font color="Maroon">a</font> <a href="polynom1.html#K6">*</a> <font color="Maroon">s</font></span>)</span></span>)</span> = 
 <a href="relset_1.html#K4">dom</a> <span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="polynom1.html#K6">*</a> <font color="Maroon">s</font></span>)</span>
<b>by </b><i><a class="ref" href="finseq_1.html#D3">FINSEQ_1:def 3</a></i>
<br/>.= 
 <a href="relset_1.html#K4">dom</a> <font color="Maroon">s</font>
<b>by </b><i><a class="ref" href="polynom1.html#D2">POLYNOM1:def 2</a></i>
<br/>.= 
 <a href="finseq_1.html#K2">Seg</a> <span class="p1">(<span class="default"><a href="finseq_1.html#K3">len</a> <font color="Maroon">s</font></span>)</span>
<b>by </b><i><a class="ref" href="finseq_1.html#D3">FINSEQ_1:def 3</a></i>
;<br/><a NAME="E10:144_1_1"/><b>then </b><i><font color="Green">E77</font></i>: 
 <a href="finseq_1.html#K3">len</a> <span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="polynom1.html#K6">*</a> <font color="Maroon">s</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="finseq_1.html#K3">len</a> <font color="Maroon">s</font>
 <b>by </b><i><a class="ref" href="finseq_1.html#T8">FINSEQ_1:8</a></i>;<br/><a NAME="E11:144_1_1"/><i><font color="Green">E78</font></i>: 
for <font color="Olive">j</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>   st 1 <a href="xxreal_0.html#R1">&lt;=</a> <font color="Olive">j</font> &amp; <font color="Olive">j</font> <a href="xxreal_0.html#R1">&lt;=</a>  <a href="finseq_1.html#K3">len</a> <span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="polynom1.html#K6">*</a> <font color="Maroon">s</font></span>)</span> holds <br/> ex <font color="Olive">c</font>, <font color="Olive">d</font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font> st <br/>( <span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="polynom1.html#K6">*</a> <font color="Maroon">s</font></span>)</span> <a href="funct_1.html#K1">.</a> <font color="Olive">j</font> <a href="hidden.html#R1">=</a> <font color="Olive">c</font> <a href="group_1.html#K10">*</a> <font color="Olive">d</font> &amp; <font color="Olive">c</font> <a href="hidden.html#R2">in</a> <font color="Maroon">I</font> <a href="ideal_1.html#K16" target="_self">%</a> <font color="Maroon">J</font> &amp; <font color="Olive">d</font> <a href="hidden.html#R2">in</a> <font color="Maroon">J</font> )
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="144_1_1_2"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">j</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/>

<b>assume </b><a NAME="E1:144_1_1_2"/><i><font color="Green">E79</font></i>: 
( 1 <a href="xxreal_0.html#R1">&lt;=</a> <font color="Maroon">j</font> &amp; <font color="Maroon">j</font> <a href="xxreal_0.html#R1">&lt;=</a>  <a href="finseq_1.html#K3">len</a> <span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="polynom1.html#K6">*</a> <font color="Maroon">s</font></span>)</span> )
 ;<br/>

<b>then consider </b><font color="Maroon">c</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font>, <font color="Maroon">d</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font><b> such that </b><br/><a NAME="E3:144_1_1_2"/><i><font color="Green">E82</font></i>: 
( <font color="Maroon">s</font> <a href="funct_1.html#K1">.</a> <font color="Maroon">j</font> <a href="hidden.html#R1">=</a> <font color="Maroon">c</font> <a href="group_1.html#K10">*</a> <font color="Maroon">d</font> &amp; <font color="Maroon">c</font> <a href="hidden.html#R2">in</a> <font color="Maroon">J</font> &amp; <font color="Maroon">d</font> <a href="hidden.html#R2">in</a> <font color="Maroon">K</font> )
 <b>by </b><i><a class="ref" href="ideal_1.html#T17" target="_self">Th17</a>, </i>;<br/>
<a NAME="E4:144_1_1_2"/>
<font color="Maroon">j</font> <a href="hidden.html#R2">in</a>  <a href="finseq_1.html#K2">Seg</a> <span class="p1">(<span class="default"><a href="finseq_1.html#K3">len</a> <font color="Maroon">s</font></span>)</span>
 
<b>by </b><i>, , <a class="ref" href="finseq_1.html#T3">FINSEQ_1:3</a></i>;<br/>
<a NAME="E5:144_1_1_2"/><b>then </b><i><font color="Green">E83</font></i>: 
<font color="Maroon">j</font> <a href="hidden.html#R2">in</a>  <a href="relset_1.html#K4">dom</a> <font color="Maroon">s</font>
 
<b>by </b><i><a class="ref" href="finseq_1.html#D3">FINSEQ_1:def 3</a></i>;<br/>
<a NAME="E6:144_1_1_2"/><b>then </b><i><font color="Green">E119</font></i>: 
<font color="Maroon">s</font> <a href="finseq_4.html#K4">/.</a> <font color="Maroon">j</font> <a href="hidden.html#R1">=</a> <font color="Maroon">c</font> <a href="group_1.html#K10">*</a> <font color="Maroon">d</font>
 
<b>by </b><i>, <a class="ref" href="finseq_4.html#D4">FINSEQ_4:def 4</a></i>;<br/>
<i><font color="Green">E120</font></i>: <span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="polynom1.html#K6">*</a> <font color="Maroon">s</font></span>)</span> <a href="funct_1.html#K1">.</a> <font color="Maroon">j</font> = 
<span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="polynom1.html#K6">*</a> <font color="Maroon">s</font></span>)</span> <a href="finseq_4.html#K4">/.</a> <font color="Maroon">j</font>
<b>by </b><i>, , <a class="ref" href="finseq_4.html#D4">FINSEQ_4:def 4</a></i>
<br/>.= 
<font color="Maroon">a</font> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">c</font> <a href="group_1.html#K10">*</a> <font color="Maroon">d</font></span>)</span>
<b>by </b><i>, , <a class="ref" href="polynom1.html#D2">POLYNOM1:def 2</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="group_1.html#K10">*</a> <font color="Maroon">d</font></span>)</span> <a href="group_1.html#K10">*</a> <font color="Maroon">c</font>
<b>by </b><i><a class="ref" href="group_1.html#D4">GROUP_1:def 4</a></i>
;<br/>
<a NAME="E8:144_1_1_2"/>
<font color="Maroon">a</font> <a href="group_1.html#K10">*</a> <font color="Maroon">d</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><font color="Maroon">a</font> <a href="group_1.html#K10">*</a> <font color="Olive">b'</font></span>)</span> where <font color="Olive">b'</font> is   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font> : <font color="Olive">b'</font> <a href="hidden.html#R2">in</a> <font color="Maroon">K</font> </span>}</span> 
 
<b>by </b><i/>;<br/>
<a NAME="E9:144_1_1_2"/><b>then </b>
<font color="Maroon">a</font> <a href="group_1.html#K10">*</a> <font color="Maroon">d</font> <a href="hidden.html#R2">in</a> <font color="Maroon">a</font> <a href="ideal_1.html#K10" target="_self">*</a> <font color="Maroon">K</font>
 
;<br/>
<b>hence </b><a NAME="E10:144_1_1_2"/>
 ex <font color="Olive">c</font>, <font color="Olive">d</font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font> st <br/>( <span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="polynom1.html#K6">*</a> <font color="Maroon">s</font></span>)</span> <a href="funct_1.html#K1">.</a> <font color="Maroon">j</font> <a href="hidden.html#R1">=</a> <font color="Olive">c</font> <a href="group_1.html#K10">*</a> <font color="Olive">d</font> &amp; <font color="Olive">c</font> <a href="hidden.html#R2">in</a> <font color="Maroon">I</font> <a href="ideal_1.html#K16" target="_self">%</a> <font color="Maroon">J</font> &amp; <font color="Olive">d</font> <a href="hidden.html#R2">in</a> <font color="Maroon">J</font> )
 <b>by </b><i><a class="ref" href="ideal_1.html#T13" target="_self">Th13</a>, , <a class="txt" href="ideal_1.html#E8:144_1_1"><i><font color="Green">E72</font></i></a></i>;<br/>


</div><b>end;</b></div><a NAME="E12:144_1_1"/><i><font color="Green">E121</font></i>: 
 <a href="rlvect_1.html#K9">Sum</a> <span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="polynom1.html#K6">*</a> <font color="Maroon">s</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">v</font>
 <b>by </b><i><a class="ref" href="ideal_1.html#T14" target="_self">Th14</a>, <a class="ref" href="ideal_1.html#T17" target="_self">Th17</a>, <a class="ref" href="binom.html#T4">BINOM:4</a></i>;<br/><a NAME="E13:144_1_1"/>
 <a href="rlvect_1.html#K9">Sum</a> <span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="polynom1.html#K6">*</a> <font color="Maroon">s</font></span>)</span> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><a href="rlvect_1.html#K9">Sum</a> <font color="Olive">t</font></span>)</span> where <font color="Olive">t</font> is    <a href="finseq_1.html#M2">FinSequence</a> of the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">R</font> : for <font color="Olive">i</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>   st 1 <a href="xxreal_0.html#R1">&lt;=</a> <font color="Olive">i</font> &amp; <font color="Olive">i</font> <a href="xxreal_0.html#R1">&lt;=</a>  <a href="finseq_1.html#K3">len</a> <font color="Olive">t</font> holds <br/> ex <font color="Olive">a</font>, <font color="Olive">b</font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font> st <br/>( <font color="Olive">t</font> <a href="funct_1.html#K1">.</a> <font color="Olive">i</font> <a href="hidden.html#R1">=</a> <font color="Olive">a</font> <a href="group_1.html#K10">*</a> <font color="Olive">b</font> &amp; <font color="Olive">a</font> <a href="hidden.html#R2">in</a> <font color="Maroon">I</font> <a href="ideal_1.html#K16" target="_self">%</a> <font color="Maroon">J</font> &amp; <font color="Olive">b</font> <a href="hidden.html#R2">in</a> <font color="Maroon">J</font> ) </span>}</span> 
 <b>by </b><i/>;<br/><a NAME="E14:144_1_1"/><b>then </b><i><font color="Green">E122</font></i>: 
<font color="Maroon">v</font> <a href="hidden.html#R2">in</a> <span class="p1">(<span class="default"><font color="Maroon">I</font> <a href="ideal_1.html#K16" target="_self">%</a> <font color="Maroon">J</font></span>)</span> <a href="ideal_1.html#K15" target="_self">*'</a> <font color="Maroon">J</font>
 <b>by </b><i/>;<br/><a NAME="E15:144_1_1"/>
<span class="p1">(<span class="default"><font color="Maroon">I</font> <a href="ideal_1.html#K16" target="_self">%</a> <font color="Maroon">J</font></span>)</span> <a href="ideal_1.html#K15" target="_self">*'</a> <font color="Maroon">J</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">I</font>
 <b>by </b><i><a class="ref" href="ideal_1.html#D5" target="_self">Def5</a></i>;<br/><b>hence </b><a NAME="E16:144_1_1"/>
<font color="Maroon">v</font> <a href="hidden.html#R2">in</a> <font color="Maroon">I</font>
 <b>by </b><i/>;<br/></div><b>end;</b></div><a NAME="E6:144_1"/><b>then </b>
<font color="Maroon">a</font> <a href="ideal_1.html#K10" target="_self">*</a> <span class="p1">(<span class="default"><font color="Maroon">J</font> <a href="ideal_1.html#K15" target="_self">*'</a> <font color="Maroon">K</font></span>)</span> <a href="tarski.html#R1">c=</a> <font color="Maroon">I</font>
 <b>by </b><i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a></i>;<br/><a NAME="E7:144_1"/><b>then </b>
<font color="Maroon">u</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <font color="Olive">f</font> where <font color="Olive">f</font> is   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font> : <font color="Olive">f</font> <a href="ideal_1.html#K10" target="_self">*</a> <span class="p1">(<span class="default"><font color="Maroon">J</font> <a href="ideal_1.html#K15" target="_self">*'</a> <font color="Maroon">K</font></span>)</span> <a href="tarski.html#R1">c=</a> <font color="Maroon">I</font> </span>}</span> 
 <b>by </b><i><a class="ref" href="ideal_1.html#T13" target="_self">Th13</a></i>;<br/><b>hence </b><a NAME="E8:144_1"/>
<font color="Maroon">u</font> <a href="hidden.html#R2">in</a> <font color="Maroon">I</font> <a href="ideal_1.html#K16" target="_self">%</a> <span class="p1">(<span class="default"><font color="Maroon">J</font> <a href="ideal_1.html#K15" target="_self">*'</a> <font color="Maroon">K</font></span>)</span>
 ;<br/></div><b>end;</b></div>
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="144_2"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">u</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>assume </b><a NAME="E1:144_2"/>
<font color="Maroon">u</font> <a href="hidden.html#R2">in</a> <font color="Maroon">I</font> <a href="ideal_1.html#K16" target="_self">%</a> <span class="p1">(<span class="default"><font color="Maroon">J</font> <a href="ideal_1.html#K15" target="_self">*'</a> <font color="Maroon">K</font></span>)</span>
 ;<br/><a NAME="E2:144_2"/><b>then </b>
<font color="Maroon">u</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <font color="Olive">f</font> where <font color="Olive">f</font> is   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font> : <font color="Olive">f</font> <a href="ideal_1.html#K10" target="_self">*</a> <span class="p1">(<span class="default"><font color="Maroon">J</font> <a href="ideal_1.html#K15" target="_self">*'</a> <font color="Maroon">K</font></span>)</span> <a href="tarski.html#R1">c=</a> <font color="Maroon">I</font> </span>}</span> 
 ;<br/><b>then consider </b><font color="Maroon">a</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font><b> such that </b><br/><a NAME="E4:144_2"/><i><font color="Green">E123</font></i>: 
( <font color="Maroon">u</font> <a href="hidden.html#R1">=</a> <font color="Maroon">a</font> &amp; <font color="Maroon">a</font> <a href="ideal_1.html#K10" target="_self">*</a> <span class="p1">(<span class="default"><font color="Maroon">J</font> <a href="ideal_1.html#K15" target="_self">*'</a> <font color="Maroon">K</font></span>)</span> <a href="tarski.html#R1">c=</a> <font color="Maroon">I</font> )
 ;<br/><div><a class="txt" onclick="hs2(this)" href="javascript:()" title="144_2_1"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">v</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>assume </b><a NAME="E1:144_2_1"/>
<font color="Maroon">v</font> <a href="hidden.html#R2">in</a> <font color="Maroon">a</font> <a href="ideal_1.html#K10" target="_self">*</a> <font color="Maroon">K</font>
 ;<br/><a NAME="E2:144_2_1"/><b>then </b>
<font color="Maroon">v</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><font color="Maroon">a</font> <a href="group_1.html#K10">*</a> <font color="Olive">b</font></span>)</span> where <font color="Olive">b</font> is   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font> : <font color="Olive">b</font> <a href="hidden.html#R2">in</a> <font color="Maroon">K</font> </span>}</span> 
 ;<br/><b>then consider </b><font color="Maroon">b</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font><b> such that </b><br/><a NAME="E4:144_2_1"/><i><font color="Green">E124</font></i>: 
( <font color="Maroon">v</font> <a href="hidden.html#R1">=</a> <font color="Maroon">a</font> <a href="group_1.html#K10">*</a> <font color="Maroon">b</font> &amp; <font color="Maroon">b</font> <a href="hidden.html#R2">in</a> <font color="Maroon">K</font> )
 ;<br/><div><a class="txt" onclick="hs2(this)" href="javascript:()" title="144_2_1_1"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">z</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>assume </b><a NAME="E1:144_2_1_1"/>
<font color="Maroon">z</font> <a href="hidden.html#R2">in</a> <span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="group_1.html#K10">*</a> <font color="Maroon">b</font></span>)</span> <a href="ideal_1.html#K10" target="_self">*</a> <font color="Maroon">J</font>
 ;<br/><a NAME="E2:144_2_1_1"/><b>then </b>
<font color="Maroon">z</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">a</font> <a href="group_1.html#K10">*</a> <font color="Maroon">b</font></span>)</span> <a href="group_1.html#K10">*</a> <font color="Olive">c</font></span>)</span> where <font color="Olive">c</font> is   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font> : <font color="Olive">c</font> <a href="hidden.html#R2">in</a> <font color="Maroon">J</font> </span>}</span> 
 ;<br/><b>then consider </b><font color="Maroon">c</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font><b> such that </b><br/><a NAME="E4:144_2_1_1"/><i><font color="Green">E125</font></i>: 
( <font color="Maroon">z</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="group_1.html#K10">*</a> <font color="Maroon">b</font></span>)</span> <a href="group_1.html#K10">*</a> <font color="Maroon">c</font> &amp; <font color="Maroon">c</font> <a href="hidden.html#R2">in</a> <font color="Maroon">J</font> )
 ;<br/><a NAME="E5:144_2_1_1"/><i><font color="Green">E126</font></i>: 
<font color="Maroon">z</font> <a href="hidden.html#R1">=</a> <font color="Maroon">a</font> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">c</font> <a href="group_1.html#K10">*</a> <font color="Maroon">b</font></span>)</span>
 <b>by </b><i><a class="ref" href="ideal_1.html#T17" target="_self">Th17</a>, <a class="ref" href="group_1.html#D4">GROUP_1:def 4</a></i>;<br/><b>set </b><font color="Maroon">q</font> = <span class="p1"><a href="finseq_1.html#K12">&lt;*</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">c</font> <a href="group_1.html#K10">*</a> <font color="Maroon">b</font></span>)</span></span><a href="finseq_1.html#K12">*&gt;</a></span>;<br/><a NAME="E6:144_2_1_1"/><i><font color="Green">E127</font></i>: 
 <a href="finseq_1.html#K3">len</a> <span class="p1"><a href="finseq_1.html#K12">&lt;*</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">c</font> <a href="group_1.html#K10">*</a> <font color="Maroon">b</font></span>)</span></span><a href="finseq_1.html#K12">*&gt;</a></span> <a href="hidden.html#R1">=</a> 1
 <b>by </b><i><a class="ref" href="finseq_1.html#T57">FINSEQ_1:57</a></i>;<br/><a NAME="E7:144_2_1_1"/><i><font color="Green">E129</font></i>: 
for <font color="Olive">i</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>   st 1 <a href="xxreal_0.html#R1">&lt;=</a> <font color="Olive">i</font> &amp; <font color="Olive">i</font> <a href="xxreal_0.html#R1">&lt;=</a>  <a href="finseq_1.html#K3">len</a> <span class="p1"><a href="finseq_1.html#K12">&lt;*</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">c</font> <a href="group_1.html#K10">*</a> <font color="Maroon">b</font></span>)</span></span><a href="finseq_1.html#K12">*&gt;</a></span> holds <br/> ex <font color="Olive">x</font>, <font color="Olive">y</font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font> st <br/>( <span class="p1"><a href="finseq_1.html#K12">&lt;*</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">c</font> <a href="group_1.html#K10">*</a> <font color="Maroon">b</font></span>)</span></span><a href="finseq_1.html#K12">*&gt;</a></span> <a href="funct_1.html#K1">.</a> <font color="Olive">i</font> <a href="hidden.html#R1">=</a> <font color="Olive">x</font> <a href="group_1.html#K10">*</a> <font color="Olive">y</font> &amp; <font color="Olive">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">J</font> &amp; <font color="Olive">y</font> <a href="hidden.html#R2">in</a> <font color="Maroon">K</font> )
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="144_2_1_1_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">i</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/>

<b>assume </b><a NAME="E1:144_2_1_1_1"/>
( 1 <a href="xxreal_0.html#R1">&lt;=</a> <font color="Maroon">i</font> &amp; <font color="Maroon">i</font> <a href="xxreal_0.html#R1">&lt;=</a>  <a href="finseq_1.html#K3">len</a> <span class="p1"><a href="finseq_1.html#K12">&lt;*</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">c</font> <a href="group_1.html#K10">*</a> <font color="Maroon">b</font></span>)</span></span><a href="finseq_1.html#K12">*&gt;</a></span> )
 ;<br/>

<b>then </b><span class="p1"><a href="finseq_1.html#K12">&lt;*</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">c</font> <a href="group_1.html#K10">*</a> <font color="Maroon">b</font></span>)</span></span><a href="finseq_1.html#K12">*&gt;</a></span> <a href="funct_1.html#K1">.</a> <font color="Maroon">i</font> = 
<span class="p1"><a href="finseq_1.html#K12">&lt;*</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">c</font> <a href="group_1.html#K10">*</a> <font color="Maroon">b</font></span>)</span></span><a href="finseq_1.html#K12">*&gt;</a></span> <a href="funct_1.html#K1">.</a> 1
<b>by </b><i>, <a class="ref" href="xxreal_0.html#T1">XXREAL_0:1</a></i>
<br/>.= 
<font color="Maroon">c</font> <a href="group_1.html#K10">*</a> <font color="Maroon">b</font>
<b>by </b><i><a class="ref" href="finseq_1.html#T57">FINSEQ_1:57</a></i>
;<br/>
<b>hence </b><a NAME="E3:144_2_1_1_1"/>
 ex <font color="Olive">x</font>, <font color="Olive">y</font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font> st <br/>( <span class="p1"><a href="finseq_1.html#K12">&lt;*</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">c</font> <a href="group_1.html#K10">*</a> <font color="Maroon">b</font></span>)</span></span><a href="finseq_1.html#K12">*&gt;</a></span> <a href="funct_1.html#K1">.</a> <font color="Maroon">i</font> <a href="hidden.html#R1">=</a> <font color="Olive">x</font> <a href="group_1.html#K10">*</a> <font color="Olive">y</font> &amp; <font color="Olive">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">J</font> &amp; <font color="Olive">y</font> <a href="hidden.html#R2">in</a> <font color="Maroon">K</font> )
 <b>by </b><i><a class="ref" href="ideal_1.html#T14" target="_self">Th14</a>, <a class="ref" href="ideal_1.html#T17" target="_self">Th17</a></i>;<br/>


</div><b>end;</b></div><a NAME="E8:144_2_1_1"/>
 <a href="rlvect_1.html#K9">Sum</a> <span class="p1"><a href="finseq_1.html#K12">&lt;*</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">c</font> <a href="group_1.html#K10">*</a> <font color="Maroon">b</font></span>)</span></span><a href="finseq_1.html#K12">*&gt;</a></span> <a href="hidden.html#R1">=</a> <font color="Maroon">c</font> <a href="group_1.html#K10">*</a> <font color="Maroon">b</font>
 <b>by </b><i><a class="ref" href="binom.html#T3">BINOM:3</a></i>;<br/><a NAME="E9:144_2_1_1"/><b>then </b>
<font color="Maroon">c</font> <a href="group_1.html#K10">*</a> <font color="Maroon">b</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><a href="rlvect_1.html#K9">Sum</a> <font color="Olive">t</font></span>)</span> where <font color="Olive">t</font> is    <a href="finseq_1.html#M2">FinSequence</a> of the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">R</font> : for <font color="Olive">i</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>   st 1 <a href="xxreal_0.html#R1">&lt;=</a> <font color="Olive">i</font> &amp; <font color="Olive">i</font> <a href="xxreal_0.html#R1">&lt;=</a>  <a href="finseq_1.html#K3">len</a> <font color="Olive">t</font> holds <br/> ex <font color="Olive">a</font>, <font color="Olive">b</font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font> st <br/>( <font color="Olive">t</font> <a href="funct_1.html#K1">.</a> <font color="Olive">i</font> <a href="hidden.html#R1">=</a> <font color="Olive">a</font> <a href="group_1.html#K10">*</a> <font color="Olive">b</font> &amp; <font color="Olive">a</font> <a href="hidden.html#R2">in</a> <font color="Maroon">J</font> &amp; <font color="Olive">b</font> <a href="hidden.html#R2">in</a> <font color="Maroon">K</font> ) </span>}</span> 
 <b>by </b><i/>;<br/><a NAME="E10:144_2_1_1"/><b>then </b>
<font color="Maroon">c</font> <a href="group_1.html#K10">*</a> <font color="Maroon">b</font> <a href="hidden.html#R2">in</a> <font color="Maroon">J</font> <a href="ideal_1.html#K15" target="_self">*'</a> <font color="Maroon">K</font>
 ;<br/><a NAME="E11:144_2_1_1"/><b>then </b>
<font color="Maroon">z</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><font color="Maroon">a</font> <a href="group_1.html#K10">*</a> <font color="Olive">f</font></span>)</span> where <font color="Olive">f</font> is   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font> : <font color="Olive">f</font> <a href="hidden.html#R2">in</a> <font color="Maroon">J</font> <a href="ideal_1.html#K15" target="_self">*'</a> <font color="Maroon">K</font> </span>}</span> 
 <b>by </b><i/>;<br/><a NAME="E12:144_2_1_1"/><b>then </b>
<font color="Maroon">z</font> <a href="hidden.html#R2">in</a> <font color="Maroon">a</font> <a href="ideal_1.html#K10" target="_self">*</a> <span class="p1">(<span class="default"><font color="Maroon">J</font> <a href="ideal_1.html#K15" target="_self">*'</a> <font color="Maroon">K</font></span>)</span>
 ;<br/><b>hence </b><a NAME="E13:144_2_1_1"/>
<font color="Maroon">z</font> <a href="hidden.html#R2">in</a> <font color="Maroon">I</font>
 <b>by </b><i><a class="ref" href="ideal_1.html#T13" target="_self">Th13</a></i>;<br/></div><b>end;</b></div><a NAME="E6:144_2_1"/><b>then </b>
<span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="group_1.html#K10">*</a> <font color="Maroon">b</font></span>)</span> <a href="ideal_1.html#K10" target="_self">*</a> <font color="Maroon">J</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">I</font>
 <b>by </b><i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a></i>;<br/><a NAME="E7:144_2_1"/><b>then </b>
<font color="Maroon">v</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <font color="Olive">f</font> where <font color="Olive">f</font> is   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font> : <font color="Olive">f</font> <a href="ideal_1.html#K10" target="_self">*</a> <font color="Maroon">J</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">I</font> </span>}</span> 
 <b>by </b><i><a class="ref" href="ideal_1.html#T14" target="_self">Th14</a></i>;<br/><b>hence </b><a NAME="E8:144_2_1"/>
<font color="Maroon">v</font> <a href="hidden.html#R2">in</a> <font color="Maroon">I</font> <a href="ideal_1.html#K16" target="_self">%</a> <font color="Maroon">J</font>
 ;<br/></div><b>end;</b></div><a NAME="E6:144_2"/><b>then </b>
<font color="Maroon">a</font> <a href="ideal_1.html#K10" target="_self">*</a> <font color="Maroon">K</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">I</font> <a href="ideal_1.html#K16" target="_self">%</a> <font color="Maroon">J</font>
 <b>by </b><i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a></i>;<br/><a NAME="E7:144_2"/><b>then </b>
<font color="Maroon">u</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <font color="Olive">f</font> where <font color="Olive">f</font> is   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font> : <font color="Olive">f</font> <a href="ideal_1.html#K10" target="_self">*</a> <font color="Maroon">K</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">I</font> <a href="ideal_1.html#K16" target="_self">%</a> <font color="Maroon">J</font> </span>}</span> 
 <b>by </b><i><a class="ref" href="ideal_1.html#T13" target="_self">Th13</a></i>;<br/><b>hence </b><a NAME="E8:144_2"/>
<font color="Maroon">u</font> <a href="hidden.html#R2">in</a> <span class="p1">(<span class="default"><font color="Maroon">I</font> <a href="ideal_1.html#K16" target="_self">%</a> <font color="Maroon">J</font></span>)</span> <a href="ideal_1.html#K16" target="_self">%</a> <font color="Maroon">K</font>
 ;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E3:144"/>
<span class="p1">(<span class="default"><font color="Maroon">I</font> <a href="ideal_1.html#K16" target="_self">%</a> <font color="Maroon">J</font></span>)</span> <a href="ideal_1.html#K16" target="_self">%</a> <font color="Maroon">K</font> <a href="hidden.html#R1">=</a> <font color="Maroon">I</font> <a href="ideal_1.html#K16" target="_self">%</a> <span class="p1">(<span class="default"><font color="Maroon">J</font> <a href="ideal_1.html#K15" target="_self">*'</a> <font color="Maroon">K</font></span>)</span>
 <b>by </b><i>, <a class="ref" href="tarski.html#T2">TARSKI:2</a></i>;<br/>


</div>
