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<b>let </b><font color="Maroon">c<sub>1</sub></font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font> be   <a href="struct_0.html#NM1">Element</a> of <span class="p1">(<span class="default"><a href="normform.html#K12">NormForm</a> <font color="Maroon">c<sub>1</sub></font></span>)</span>;<br/>



<b>thus </b><font color="Maroon">c<sub>2</sub></font> = 
 <a href="heyting1.html#K3" target="_self">@</a> <font color="Maroon">c<sub>2</sub></font>

<br/>.= 
 <a href="setwiseo.html#K10">FinUnion</a> <span class="p1">(<span class="default"><a href="heyting1.html#K3" target="_self">@</a> <font color="Maroon">c<sub>2</sub></font></span>)</span>,<span class="p1">(<span class="default"><a href="setwiseo.html#K11">singleton</a> <span class="p2">(<span class="default"><a href="normform.html#K7">DISJOINT_PAIRS</a> <font color="Maroon">c<sub>1</sub></font></span>)</span></span>)</span>
<b>by </b><i><a class="ref" href="setwiseo.html#T71">SETWISEO:71</a></i>
<br/>.= 
 <a href="lattice2.html#K2">FinJoin</a> <span class="p1">(<span class="default"><a href="heyting1.html#K3" target="_self">@</a> <font color="Maroon">c<sub>2</sub></font></span>)</span>,<span class="p1">(<span class="default"><a href="heyting1.html#K4" target="_self">Atom</a> <font color="Maroon">c<sub>1</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="heyting1.html#T14" target="_self">Th14</a></i>
;<br/>


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