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

<b>let </b><font color="Maroon">c<sub>1</sub></font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font> be  non <a href="struct_0.html#V3">empty</a>  <a href="group_1.html#L1">HGrStr</a> ;<br/><b>let </b><font color="Maroon">c<sub>3</sub></font> be   <a href="struct_0.html#NM1">Element</a> of <span class="p1">(<span class="default"><a href="monoid_1.html#K9" target="_self">.:</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>1</sub></font></span>)</span>; <i><font color="Red">:: according to </font></i><a class="ref" href="monoid_0.html#D1">MONOID_0:def 1</a><br/>





<a NAME="E1:32"/>
<font color="Maroon">c<sub>3</sub></font> is    <a href="fraenkel.html#M2">Element</a> of  <a href="fraenkel.html#K1">Funcs</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">H<sub>3</sub></font>(<font color="Maroon">c<sub>2</sub></font>)
 
<b>by </b><i><a class="ref" href="monoid_1.html#T18" target="_self">Th18</a></i>;<br/>
<b>hence </b><a NAME="E2:32"/>
<font color="Maroon">c<sub>3</sub></font> is    <a href="hidden.html#M1">set</a> 
 ;<br/>


</div>
