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<b>let </b><font color="Maroon">M</font> be  non <a href="struct_0.html#V3">empty</a>  <a href="vectsp_1.html#L1">multLoopStr</a> ;<br/>

<b>assume </b><a NAME="E1:38"/>
<font color="Maroon">H<sub>3</sub></font>(<font color="Maroon">M</font>) <a href="binop_1.html#R3">is_a_unity_wrt</a> the <a href="group_1.html#U1">mult</a> of <font color="Maroon">M</font>
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="monoid_0.html#D21" target="_self">MONOID_0:def 21</a><br/>

<b>hence </b><a NAME="E2:38"/>
<font color="Maroon">H<sub>2</sub></font>(<font color="Maroon">M</font>) <a href="setwiseo.html#NR1" target="_self">has_a_unity</a> 
 <b>by </b><i><a class="ref" href="setwiseo.html#D2">SETWISEO:def 2</a></i>; <i><font color="Red">:: according to </font></i><a class="ref" href="monoid_0.html#D10" target="_self">MONOID_0:def 10</a><br/>


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