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<b>let </b><font color="Maroon">T</font> be    <a href="pre_topc.html#L1">TopStruct</a> ;<br/>

<b>set </b><font color="Maroon">G</font> =  <a href="topgrp_1.html#K5" target="_self">HomeoGroup</a> <font color="Maroon">T</font>;<br/>
<b>reconsider </b><font color="Maroon">e</font> =  <a href="topgrp_1.html#K4" target="_self">id</a> <font color="Maroon">T</font> as   <a href="struct_0.html#NM1">Element</a> of <span class="p1">(<span class="default"><a href="topgrp_1.html#K5" target="_self">HomeoGroup</a> <font color="Maroon">T</font></span>)</span> <b>by </b><i/>;<br/>
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="56_1"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">h</font> be   <a href="struct_0.html#NM1">Element</a> of <span class="p1">(<span class="default"><a href="topgrp_1.html#K5" target="_self">HomeoGroup</a> <font color="Maroon">T</font></span>)</span>;<br/><b>reconsider </b><font color="Maroon">h1</font> = <font color="Maroon">h</font> as    <a href="topgrp_1.html#M3" target="_self">Homeomorphism</a> of <font color="Maroon">T</font> <b>by </b><i/>;<br/><b>thus </b><font color="Maroon">h</font> <a href="group_1.html#K1">*</a> <font color="Maroon">e</font> = 
<span class="p1">(<span class="default"><a href="topgrp_1.html#K4" target="_self">id</a> <font color="Maroon">T</font></span>)</span> <a href="partfun1.html#K1">*</a> <font color="Maroon">h1</font>
<b>by </b><i/>
<br/>.= 
<font color="Maroon">h</font>
<b>by </b><i><a class="ref" href="tmap_1.html#T93">TMAP_1:93</a></i>
;<br/><b>thus </b><font color="Maroon">e</font> <a href="group_1.html#K1">*</a> <font color="Maroon">h</font> = 
<font color="Maroon">h1</font> <a href="partfun1.html#K1">*</a> <span class="p1">(<span class="default"><a href="topgrp_1.html#K4" target="_self">id</a> <font color="Maroon">T</font></span>)</span>
<b>by </b><i/>
<br/>.= 
<font color="Maroon">h</font>
<b>by </b><i><a class="ref" href="tmap_1.html#T93">TMAP_1:93</a></i>
;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E3:56"/>
 <a href="topgrp_1.html#K4" target="_self">id</a> <font color="Maroon">T</font> <a href="hidden.html#R1">=</a>  <a href="group_1.html#K2">1.</a> <span class="p1">(<span class="default"><a href="topgrp_1.html#K5" target="_self">HomeoGroup</a> <font color="Maroon">T</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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