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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="fin_topo.html#L1">FT_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/>



<b>thus </b> <a href="fintopo3.html#K5" target="_self">Fint</a> <font color="Maroon">c<sub>2</sub></font>,2 = 
 <a href="fintopo3.html#K5" target="_self">Fint</a> <font color="Maroon">c<sub>2</sub></font>,<span class="p1">(<span class="default">1 <a href="nat_1.html#K1">+</a> 1</span>)</span>

<br/>.= 
<span class="p1">(<span class="default"><a href="fintopo3.html#K5" target="_self">Fint</a> <font color="Maroon">c<sub>2</sub></font>,1</span>)</span> <a href="fin_topo.html#K7">^i</a> 
<b>by </b><i><a class="ref" href="fintopo3.html#T18" target="_self">Th18</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="fin_topo.html#K7">^i</a> </span>)</span> <a href="fin_topo.html#K7">^i</a> 
<b>by </b><i><a class="ref" href="fintopo3.html#T20" target="_self">Th20</a></i>
;<br/>


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