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<b>let </b><font color="Maroon" title="c1">D</font> be  non <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>  <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/><b>let </b><font color="Maroon" title="c2">a</font>, <font color="Maroon" title="c3">b</font> be   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <span class="p1">(<span class="default"><font color="Maroon" title="c1">D</font> <a href="monoid_0.html#K11" title="MONOID_0:func.11">*+^+&lt;0&gt;</a> </span>)</span>;<br/>



<a NAME="E1:128"/>
 <a href="group_1.html#G1" title="GROUP_1:aggr.1">HGrStr</a>(# the <a href="struct_0.html#U1" title="STRUCT_0:sel.1">carrier</a> of <span class="p1">(<span class="default"><font color="Maroon" title="c1">D</font> <a href="monoid_0.html#K11" title="MONOID_0:func.11">*+^+&lt;0&gt;</a> </span>)</span>,the <a href="group_1.html#U1" title="GROUP_1:sel.1">mult</a> of <span class="p1">(<span class="default"><font color="Maroon" title="c1">D</font> <a href="monoid_0.html#K11" title="MONOID_0:func.11">*+^+&lt;0&gt;</a> </span>)</span> #) <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c1">D</font> <a href="monoid_0.html#K10" title="MONOID_0:func.10">*+^</a> 
 
<b>by </b><i><a class="ref" href="monoid_0.html#D22" target="_self" title="MONOID_0:def.22">Def22</a></i>;<br/>
<b>then reconsider </b><font color="Maroon" title="c4">p</font> = <font color="Maroon" title="c2">a</font>, <font color="Maroon" title="c5">q</font> = <font color="Maroon" title="c3">b</font> as   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <span class="p1">(<span class="default"><font color="Maroon" title="c1">D</font> <a href="monoid_0.html#K10" title="MONOID_0:func.10">*+^</a> </span>)</span> ;<br/>
<b>thus </b><font color="Maroon" title="c2">a</font> <a href="monoid_0.html#K2" title="MONOID_0:func.2">[*]</a> <font color="Maroon" title="c3">b</font> = 
<font color="Maroon" title="c4">p</font> <a href="monoid_0.html#K2" title="MONOID_0:func.2">[*]</a> <font color="Maroon" title="c5">q</font>
<b>by </b><i><a class="ref" href="monoid_0.html#T20" target="_self" title="MONOID_0:th.20">Th20</a></i>
<br/>.= 
<font color="Maroon" title="c2">a</font> <a href="finseq_1.html#K7" title="FINSEQ_1:func.7">^</a> <font color="Maroon" title="c3">b</font>
<b>by </b><i><a class="ref" href="monoid_0.html#D34" target="_self" title="MONOID_0:def.34">Def34</a></i>
;<br/>


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