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

<b>let </b><font color="Maroon">G</font> be   <a href="group_1.html#NM1">Group</a>;<br/><b>let </b><font color="Maroon">h</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">G</font>;<br/><b>let </b><font color="Maroon">g</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">G</font>;<br/>





<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">g</font> <a href="group_1.html#K3" target="_self">"</a> </span>)</span> <a href="group_1.html#K1" target="_self">*</a> <span class="p2">(<span class="default"><font color="Maroon">h</font> <a href="group_1.html#K3" target="_self">"</a> </span>)</span></span>)</span> <a href="group_1.html#K1" target="_self">*</a> <span class="p1">(<span class="default"><font color="Maroon">h</font> <a href="group_1.html#K1" target="_self">*</a> <font color="Maroon">g</font></span>)</span> = 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">g</font> <a href="group_1.html#K3" target="_self">"</a> </span>)</span> <a href="group_1.html#K1" target="_self">*</a> <span class="p3">(<span class="default"><font color="Maroon">h</font> <a href="group_1.html#K3" target="_self">"</a> </span>)</span></span>)</span> <a href="group_1.html#K1" target="_self">*</a> <font color="Maroon">h</font></span>)</span> <a href="group_1.html#K1" target="_self">*</a> <font color="Maroon">g</font>
<b>by </b><i/>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">g</font> <a href="group_1.html#K3" target="_self">"</a> </span>)</span> <a href="group_1.html#K1" target="_self">*</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">h</font> <a href="group_1.html#K3" target="_self">"</a> </span>)</span> <a href="group_1.html#K1" target="_self">*</a> <font color="Maroon">h</font></span>)</span></span>)</span> <a href="group_1.html#K1" target="_self">*</a> <font color="Maroon">g</font>
<b>by </b><i/>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">g</font> <a href="group_1.html#K3" target="_self">"</a> </span>)</span> <a href="group_1.html#K1" target="_self">*</a> <span class="p2">(<span class="default"><a href="group_1.html#K2" target="_self">1.</a> <font color="Maroon">G</font></span>)</span></span>)</span> <a href="group_1.html#K1" target="_self">*</a> <font color="Maroon">g</font>
<b>by </b><i/>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">g</font> <a href="group_1.html#K3" target="_self">"</a> </span>)</span> <a href="group_1.html#K1" target="_self">*</a> <font color="Maroon">g</font>
<b>by </b><i/>
<br/>.= 
 <a href="group_1.html#K2" target="_self">1.</a> <font color="Maroon">G</font>
<b>by </b><i/>
;<br/>
<b>hence </b><a NAME="E2:25"/>
<span class="p1">(<span class="default"><font color="Maroon">h</font> <a href="group_1.html#K1" target="_self">*</a> <font color="Maroon">g</font></span>)</span> <a href="group_1.html#K3" target="_self">"</a>  <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">g</font> <a href="group_1.html#K3" target="_self">"</a> </span>)</span> <a href="group_1.html#K1" target="_self">*</a> <span class="p1">(<span class="default"><font color="Maroon">h</font> <a href="group_1.html#K3" target="_self">"</a> </span>)</span>
 <b>by </b><i/>;<br/>


</div>
