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<b>let </b><font color="Maroon">c<sub>1</sub></font> be  non <a href="struct_0.html#V3">empty</a>  <a href="fintopo2.html#L1" target="_self">FMT_Space_Str</a> ;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font> be   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>



<a NAME="E1:51"/>
<font color="Maroon">c<sub>2</sub></font> <a href="fintopo2.html#K8" target="_self">^Fodelta</a>  <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="subset_1.html#K3">`</a> </span>)</span> <a href="subset_1.html#K3">`</a> </span>)</span> <a href="fintopo2.html#K9" target="_self">^Fob</a> </span>)</span> <a href="subset_1.html#K9">/\</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="subset_1.html#K3">`</a> </span>)</span> <a href="fintopo2.html#K9" target="_self">^Fob</a> </span>)</span>
 
<b>by </b><i><a class="ref" href="fintopo2.html#T40" target="_self">Th40</a></i>;<br/>
<b>hence </b><a NAME="E2:51"/>
<font color="Maroon">c<sub>2</sub></font> <a href="fintopo2.html#K8" target="_self">^Fodelta</a>  <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="subset_1.html#K3">`</a> </span>)</span> <a href="fintopo2.html#K8" target="_self">^Fodelta</a> 
 <b>by </b><i><a class="ref" href="fintopo2.html#T40" target="_self">Th40</a></i>;<br/>


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