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<b>let </b><font color="Maroon" title="c1">X</font> be  non <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>  <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/><b>let </b><font color="Maroon" title="c2">Y</font> be   <a href="setfam_1.html#NM1" title="SETFAM_1:NM.1">Subset-Family</a> of <font color="Maroon" title="c1">X</font>;<br/>



<a NAME="E1:24"/>
<font color="Maroon" title="c2">Y</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a>  <a href="cantor_1.html#K1" title="CANTOR_1:func.1">UniCl</a> <font color="Maroon" title="c2">Y</font>
 
<b>by </b><i><a class="ref" href="cantor_1.html#T1" target="_self" title="CANTOR_1:th.1">Th1</a></i>;<br/>
<b>hence </b><a NAME="E2:24"/>
<font color="Maroon" title="c2">Y</font> is    <a href="cantor_1.html#M1" title="CANTOR_1:mode.1">Basis</a> of  <a href="pre_topc.html#G1" title="PRE_TOPC:aggr.1">TopStruct</a>(# <font color="Maroon" title="c1">X</font>,<span class="p1">(<span class="default"><a href="cantor_1.html#K1" title="CANTOR_1:func.1">UniCl</a> <font color="Maroon" title="c2">Y</font></span>)</span> #)
 <b>by </b><i><a class="ref" href="cantor_1.html#D2" target="_self" title="CANTOR_1:def.2">Def2</a></i>;<br/>


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