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<b>let </b><font color="Maroon">A</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">B</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="finsub_1.html#K5">Fin</a> <span class="p1">(<span class="default"><a href="normform.html#K7" target="_self">DISJOINT_PAIRS</a> <font color="Maroon">A</font></span>)</span>;<br/><b>let </b><font color="Maroon">C</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="finsub_1.html#K5">Fin</a> <span class="p1">(<span class="default"><a href="normform.html#K7" target="_self">DISJOINT_PAIRS</a> <font color="Maroon">A</font></span>)</span>;<br/><b>let </b><font color="Maroon">D</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="finsub_1.html#K5">Fin</a> <span class="p1">(<span class="default"><a href="normform.html#K7" target="_self">DISJOINT_PAIRS</a> <font color="Maroon">A</font></span>)</span>;<br/>







<a NAME="E1:57"/>
( <font color="Maroon">D</font> <a href="normform.html#K10" target="_self">^</a> <font color="Maroon">C</font> <a href="hidden.html#R1">=</a> <font color="Maroon">C</font> <a href="normform.html#K10" target="_self">^</a> <font color="Maroon">D</font> &amp; <font color="Maroon">D</font> <a href="normform.html#K10" target="_self">^</a> <font color="Maroon">B</font> <a href="hidden.html#R1">=</a> <font color="Maroon">B</font> <a href="normform.html#K10" target="_self">^</a> <font color="Maroon">D</font> )
 
<b>by </b><i><a class="ref" href="normform.html#T38" target="_self">Th38</a></i>;<br/>
<b>hence </b><a NAME="E2:57"/>
( <font color="Maroon">B</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">C</font> implies <font color="Maroon">D</font> <a href="normform.html#K10" target="_self">^</a> <font color="Maroon">B</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">D</font> <a href="normform.html#K10" target="_self">^</a> <font color="Maroon">C</font> )
 <b>by </b><i><a class="txt" href="normform.html#E41"><i><font color="Green">Lemma38</font></i></a></i>;<br/>


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