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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/>

<a NAME="E1:30"/>
<span class="p1">(<span class="default"><a href="subset_1.html#K2">[#]</a> <font color="Maroon">D</font></span>)</span> <a href="rfunct_3.html#K5" target="_self">--&gt;</a> 0 <a href="binop_1.html#R3">is_a_unity_wrt</a>  <a href="rfunct_3.html#K14" target="_self">addpfunc</a> <font color="Maroon">D</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:30"/>
 <a href="binop_1.html#K3">the_unity_wrt</a> <span class="p1">(<span class="default"><a href="rfunct_3.html#K14" target="_self">addpfunc</a> <font color="Maroon">D</font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="subset_1.html#K2">[#]</a> <font color="Maroon">D</font></span>)</span> <a href="rfunct_3.html#K5" target="_self">--&gt;</a> 0
 <b>by </b><i><a class="ref" href="binop_1.html#D8">BINOP_1:def 8</a></i>;<br/>


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