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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="finset_1.html#V1">finite</a>  <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">c<sub>3</sub></font> be    <a href="subset_1.html#M2">Element</a> of  <a href="substlat.html#K1">SubstitutionSet</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font>;<br/>





<b>thus </b><font color="Maroon">c<sub>3</sub></font> = 
 <a href="setwiseo.html#K10">FinUnion</a> <font color="Maroon">c<sub>3</sub></font>,<span class="p1">(<span class="default"><a href="setwiseo.html#K11">singleton</a> <span class="p2">(<span class="default"><a href="partfun1.html#K4">PFuncs</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</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> <font color="Maroon">c<sub>3</sub></font>,<span class="p1">(<span class="default"><a href="heyting2.html#K8" target="_self">Atom</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="heyting2.html#T23" target="_self">Th23</a></i>
;<br/>


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