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<b>let </b><font color="Maroon">D</font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">m1</font> be   <a href="monoid_1.html#NM2">Multiset</a> of <font color="Maroon">D</font>, <font color="Maroon">m2</font> be   <a href="monoid_1.html#NM2">Multiset</a> of <font color="Maroon">D</font>;<br/><b>let </b><font color="Maroon">a</font> be    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">D</font>;<br/>





<b>reconsider </b><font color="Maroon">N</font> =  <a href="monoid_0.html#K6">&lt;NAT,+,0&gt;</a>  as  non <a href="struct_0.html#V3">empty</a>  <a href="group_1.html#L1">HGrStr</a>  ;<br/>
<b>reconsider </b><font color="Maroon">f1</font> = <font color="Maroon">m1</font>, <font color="Maroon">f2</font> = <font color="Maroon">m2</font> as   <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">N</font>,<font color="Maroon">D</font></span>)</span> ;<br/>
<b>thus </b><span class="p1">(<span class="default"><font color="Maroon">m1</font> <a href="monoid_0.html#K2">[*]</a> <font color="Maroon">m2</font></span>)</span> <a href="monoid_1.html#K15" target="_self">.</a> <font color="Maroon">a</font> = 
<span class="p1">(<span class="default"><font color="Maroon">f1</font> <a href="monoid_1.html#K10" target="_self">.</a> <font color="Maroon">a</font></span>)</span> <a href="group_1.html#K1">*</a> <span class="p1">(<span class="default"><font color="Maroon">f2</font> <a href="monoid_1.html#K10" target="_self">.</a> <font color="Maroon">a</font></span>)</span>
<b>by </b><i/>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">m1</font> <a href="monoid_1.html#K15" target="_self">.</a> <font color="Maroon">a</font></span>)</span> <a href="nat_1.html#K1">+</a> <span class="p1">(<span class="default"><font color="Maroon">m2</font> <a href="monoid_1.html#K15" target="_self">.</a> <font color="Maroon">a</font></span>)</span>
<b>by </b><i><a class="ref" href="monoid_0.html#T51">MONOID_0:51</a></i>
;<br/>


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