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<b>let </b><font color="Maroon">n</font> be   <a href="nat_1.html#NM1">Nat</a>;<br/>

<b>reconsider </b><font color="Maroon">e'</font> =  <a href="finseq_2.html#K1">idseq</a> <font color="Maroon">n</font> as    <a href="matrix_2.html#M3" target="_self">Element</a> of  <a href="matrix_2.html#K12" target="_self">Permutations</a> <font color="Maroon">n</font> <b>by </b><i/>;<br/>
<b>reconsider </b><font color="Maroon">e</font> =  <a href="finseq_2.html#K1">idseq</a> <font color="Maroon">n</font> as   <a href="struct_0.html#NM1">Element</a> of <span class="p1">(<span class="default"><a href="matrix_2.html#K13" target="_self">Group_of_Perm</a> <font color="Maroon">n</font></span>)</span> <b>by </b><i/>;<br/>
<a NAME="E3:49"/>
for <font color="Olive">p</font> being  <a href="struct_0.html#NM1">Element</a> of <span class="p1">(<span class="default"><a href="matrix_2.html#K13" target="_self">Group_of_Perm</a> <font color="Maroon">n</font></span>)</span> holds <br/> ( <font color="Olive">p</font> <a href="group_1.html#K1">*</a> <font color="Maroon">e</font> <a href="hidden.html#R1">=</a> <font color="Olive">p</font> &amp; <font color="Maroon">e</font> <a href="group_1.html#K1">*</a> <font color="Olive">p</font> <a href="hidden.html#R1">=</a> <font color="Olive">p</font> )
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="49_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">p</font> be   <a href="struct_0.html#NM1">Element</a> of <span class="p1">(<span class="default"><a href="matrix_2.html#K13" target="_self">Group_of_Perm</a> <font color="Maroon">n</font></span>)</span>;<br/>

<b>reconsider </b><font color="Maroon">p'</font> = <font color="Maroon">p</font> as    <a href="matrix_2.html#M3" target="_self">Element</a> of  <a href="matrix_2.html#K12" target="_self">Permutations</a> <font color="Maroon">n</font> <b>by </b><i/>;<br/>
<i><font color="Green">E52</font></i>: <font color="Maroon">p</font> <a href="group_1.html#K1">*</a> <font color="Maroon">e</font> = 
the <a href="group_1.html#U1">mult</a> of <span class="p1">(<span class="default"><a href="matrix_2.html#K13" target="_self">Group_of_Perm</a> <font color="Maroon">n</font></span>)</span> <a href="binop_1.html#K1">.</a> <font color="Maroon">p'</font>,<font color="Maroon">e'</font>
<b>by </b><i><a class="ref" href="group_1.html#D1">GROUP_1:def 1</a></i>
<br/>.= 
<font color="Maroon">e'</font> <a href="partfun1.html#K1">*</a> <font color="Maroon">p'</font>
<b>by </b><i/>
<br/>.= 
<font color="Maroon">p</font>
<b>by </b><i/>
;<br/>
<font color="Maroon">e</font> <a href="group_1.html#K1">*</a> <font color="Maroon">p</font> = 
the <a href="group_1.html#U1">mult</a> of <span class="p1">(<span class="default"><a href="matrix_2.html#K13" target="_self">Group_of_Perm</a> <font color="Maroon">n</font></span>)</span> <a href="binop_1.html#K1">.</a> <font color="Maroon">e'</font>,<font color="Maroon">p'</font>
<b>by </b><i><a class="ref" href="group_1.html#D1">GROUP_1:def 1</a></i>
<br/>.= 
<font color="Maroon">p'</font> <a href="partfun1.html#K1">*</a> <font color="Maroon">e'</font>
<b>by </b><i/>
<br/>.= 
<font color="Maroon">p</font>
<b>by </b><i/>
;<br/>
<b>hence </b><a NAME="E4:49_1"/>
( <font color="Maroon">p</font> <a href="group_1.html#K1">*</a> <font color="Maroon">e</font> <a href="hidden.html#R1">=</a> <font color="Maroon">p</font> &amp; <font color="Maroon">e</font> <a href="group_1.html#K1">*</a> <font color="Maroon">p</font> <a href="hidden.html#R1">=</a> <font color="Maroon">p</font> )
 <b>by </b><i/>;<br/>


</div><b>end;</b></div>
<b>hence </b><a NAME="E4:49"/>
 <a href="finseq_2.html#K1">idseq</a> <font color="Maroon">n</font> <a href="hidden.html#R1">=</a>  <a href="group_1.html#K2">1.</a> <span class="p1">(<span class="default"><a href="matrix_2.html#K13" target="_self">Group_of_Perm</a> <font color="Maroon">n</font></span>)</span>
 <b>by </b><i><a class="ref" href="group_1.html#T10">GROUP_1:10</a></i>;<br/>


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