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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">F</font> be  non <a href="struct_0.html#V3">empty</a> <a href="group_1.html#V2">unital</a>  <a href="monoid_0.html#M2" target="_self">SubStr</a> of <font color="Maroon">D</font> <a href="monoid_0.html#K10" target="_self">*+^</a> ;<br/>



<b>set </b><font color="Maroon">p</font> =  <a href="binop_1.html#K3">the_unity_wrt</a> <font color="Maroon">H<sub>2</sub></font>(<font color="Maroon">F</font>);<br/>
<b>reconsider </b><font color="Maroon">q</font> =  <a href="binop_1.html#K3">the_unity_wrt</a> <font color="Maroon">H<sub>2</sub></font>(<font color="Maroon">F</font>) as   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">F</font> ;<br/>
<a NAME="E2:132"/><i><font color="Green">E28</font></i>: 
<font color="Maroon">H<sub>2</sub></font>(<font color="Maroon">F</font>) <a href="setwiseo.html#NR1" target="_self">has_a_unity</a> 
 
<b>by </b><i/>;<br/>
<font color="Maroon">q</font> <a href="finseq_1.html#K7">^</a> <a href="xboole_0.html#K1">{}</a>  = 
 <a href="binop_1.html#K3">the_unity_wrt</a> <font color="Maroon">H<sub>2</sub></font>(<font color="Maroon">F</font>)
<b>by </b><i><a class="ref" href="finseq_1.html#T47">FINSEQ_1:47</a></i>
<br/>.= 
<span class="p1">(<span class="default"><a href="binop_1.html#K3">the_unity_wrt</a> <font color="Maroon">H<sub>2</sub></font>(<font color="Maroon">F</font>)</span>)</span> <a href="monoid_0.html#K2" target="_self">[*]</a> <span class="p1">(<span class="default"><a href="binop_1.html#K3">the_unity_wrt</a> <font color="Maroon">H<sub>2</sub></font>(<font color="Maroon">F</font>)</span>)</span>
<b>by </b><i><a class="ref" href="monoid_0.html#T16" target="_self">Th16</a>, <a class="ref" href="setwiseo.html#T23">SETWISEO:23</a></i>
<br/>.= 
<font color="Maroon">q</font> <a href="finseq_1.html#K7">^</a> <font color="Maroon">q</font>
<b>by </b><i><a class="ref" href="monoid_0.html#T15" target="_self">Th15</a></i>
;<br/>
<b>hence </b><a NAME="E4:132"/>
 <a href="binop_1.html#K3">the_unity_wrt</a> the <a href="group_1.html#U1">mult</a> of <font color="Maroon">F</font> <a href="hidden.html#R1">=</a>  <a href="xboole_0.html#K1">{}</a> 
 <b>by </b><i><a class="ref" href="finseq_1.html#T46">FINSEQ_1:46</a></i>;<br/>


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