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<b>let </b><font color="Maroon">X</font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">Y</font> be   <a href="setfam_1.html#NM1">Subset-Family</a> of <font color="Maroon">X</font>;<br/>



<a NAME="E1:24"/>
<font color="Maroon">Y</font> <a href="tarski.html#R1">c=</a>  <a href="cantor_1.html#K1" target="_self">UniCl</a> <font color="Maroon">Y</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:24"/>
<font color="Maroon">Y</font> is    <a href="cantor_1.html#M1" target="_self">Basis</a> of  <a href="pre_topc.html#G1">TopStruct</a>(# <font color="Maroon">X</font>,<span class="p1">(<span class="default"><a href="cantor_1.html#K1" target="_self">UniCl</a> <font color="Maroon">Y</font></span>)</span> #)
 <b>by </b><i/>;<br/>


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