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<b>let </b><font color="Maroon">x</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">G</font> be   <a href="group_1.html#NM1">Group</a>;<br/>



<b>thus </b><a NAME="E1:79"/>
( <font color="Maroon">x</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">G</font> <a href="group_5.html#K9" target="_self">`</a>  implies  ex <font color="Olive">F</font> being   <a href="finseq_1.html#M2">FinSequence</a> of the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">G</font> ex <font color="Olive">I</font> being   <a href="finseq_1.html#M2">FinSequence</a> of  <a href="numbers.html#K4">INT</a>  st <br/>(  <a href="finseq_1.html#K3">len</a> <font color="Olive">F</font> <a href="hidden.html#R1">=</a>  <a href="finseq_1.html#K3">len</a> <font color="Olive">I</font> &amp;  <a href="relat_1.html#K2">rng</a> <font color="Olive">F</font> <a href="tarski.html#R1">c=</a>  <a href="group_5.html#K6" target="_self">commutators</a> <font color="Maroon">G</font> &amp; <font color="Maroon">x</font> <a href="hidden.html#R1">=</a>  <a href="group_4.html#K3">Product</a> <span class="p1">(<span class="default"><font color="Olive">F</font> <a href="group_4.html#K4">|^</a> <font color="Olive">I</font></span>)</span> ) )
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="79_1"><b>proof </b></a><div class="add">

<b>assume </b><a NAME="E1:79_1"/><i><font color="Green">E58</font></i>: 
<font color="Maroon">x</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">G</font> <a href="group_5.html#K9" target="_self">`</a> 
 ;<br/>

<a NAME="E2:79_1"/><b>then </b><i><font color="Green">E59</font></i>: 
<font color="Maroon">x</font> <a href="rlvect_1.html#R1">in</a>  <a href="group_4.html#K5">gr</a> <span class="p1">(<span class="default"><a href="group_5.html#K6" target="_self">commutators</a> <font color="Maroon">G</font></span>)</span>
 
;<br/>
<a NAME="E3:79_1"/>
<font color="Maroon">x</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">G</font>
 
<b>by </b><i>, <a class="ref" href="group_2.html#T49">GROUP_2:49</a></i>;<br/>
<b>then reconsider </b><font color="Maroon">a</font> = <font color="Maroon">x</font> as   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">G</font> <b>by </b><i><a class="ref" href="rlvect_1.html#D1">RLVECT_1:def 1</a></i>;<br/>
<a NAME="E5:79_1"/>
 ex <font color="Olive">F</font> being   <a href="finseq_1.html#M2">FinSequence</a> of the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">G</font> ex <font color="Olive">I</font> being   <a href="finseq_1.html#M2">FinSequence</a> of  <a href="numbers.html#K4">INT</a>  st <br/>(  <a href="finseq_1.html#K3">len</a> <font color="Olive">F</font> <a href="hidden.html#R1">=</a>  <a href="finseq_1.html#K3">len</a> <font color="Olive">I</font> &amp;  <a href="relat_1.html#K2">rng</a> <font color="Olive">F</font> <a href="tarski.html#R1">c=</a>  <a href="group_5.html#K6" target="_self">commutators</a> <font color="Maroon">G</font> &amp; <font color="Maroon">a</font> <a href="hidden.html#R1">=</a>  <a href="group_4.html#K3">Product</a> <span class="p1">(<span class="default"><font color="Olive">F</font> <a href="group_4.html#K4">|^</a> <font color="Olive">I</font></span>)</span> )
 
<b>by </b><i>, <a class="ref" href="group_4.html#T37">GROUP_4:37</a></i>;<br/>
<b>hence </b><a NAME="E6:79_1"/>
 ex <font color="Olive">F</font> being   <a href="finseq_1.html#M2">FinSequence</a> of the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">G</font> ex <font color="Olive">I</font> being   <a href="finseq_1.html#M2">FinSequence</a> of  <a href="numbers.html#K4">INT</a>  st <br/>(  <a href="finseq_1.html#K3">len</a> <font color="Olive">F</font> <a href="hidden.html#R1">=</a>  <a href="finseq_1.html#K3">len</a> <font color="Olive">I</font> &amp;  <a href="relat_1.html#K2">rng</a> <font color="Olive">F</font> <a href="tarski.html#R1">c=</a>  <a href="group_5.html#K6" target="_self">commutators</a> <font color="Maroon">G</font> &amp; <font color="Maroon">x</font> <a href="hidden.html#R1">=</a>  <a href="group_4.html#K3">Product</a> <span class="p1">(<span class="default"><font color="Olive">F</font> <a href="group_4.html#K4">|^</a> <font color="Olive">I</font></span>)</span> )
 ;<br/>


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

<b>given </b><font color="Maroon">F</font> being    <a href="finseq_1.html#M2">FinSequence</a> of the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">G</font>, <font color="Maroon">I</font> being    <a href="finseq_1.html#M2">FinSequence</a> of  <a href="numbers.html#K4">INT</a> <b> such that </b><a NAME="E2:79"/><i><font color="Green">E63</font></i>: 
(  <a href="finseq_1.html#K3">len</a> <font color="Maroon">F</font> <a href="hidden.html#R1">=</a>  <a href="finseq_1.html#K3">len</a> <font color="Maroon">I</font> &amp;  <a href="relat_1.html#K2">rng</a> <font color="Maroon">F</font> <a href="tarski.html#R1">c=</a>  <a href="group_5.html#K6" target="_self">commutators</a> <font color="Maroon">G</font> &amp; <font color="Maroon">x</font> <a href="hidden.html#R1">=</a>  <a href="group_4.html#K3">Product</a> <span class="p1">(<span class="default"><font color="Maroon">F</font> <a href="group_4.html#K4">|^</a> <font color="Maroon">I</font></span>)</span> )
 ;<br/>

<a NAME="E3:79"/>
 <a href="group_4.html#K3">Product</a> <span class="p1">(<span class="default"><font color="Maroon">F</font> <a href="group_4.html#K4">|^</a> <font color="Maroon">I</font></span>)</span> <a href="rlvect_1.html#R1">in</a>  <a href="group_4.html#K5">gr</a> <span class="p1">(<span class="default"><a href="group_5.html#K6" target="_self">commutators</a> <font color="Maroon">G</font></span>)</span>
 
<b>by </b><i>, <a class="ref" href="group_4.html#T37">GROUP_4:37</a></i>;<br/>
<b>hence </b><a NAME="E4:79"/>
<font color="Maroon">x</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">G</font> <a href="group_5.html#K9" target="_self">`</a> 
 <b>by </b><i/>;<br/>


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