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<b>let </b><font color="Maroon">T</font> be  non <a href="struct_0.html#V3">empty</a> <a href="pre_topc.html#NM1">TopSpace</a>;<br/><b>let </b><font color="Maroon">B</font> be   <a href="struct_0.html#NM3">Subset-Family</a> of <font color="Maroon">T</font>;<br/>



<b>assume </b><a NAME="E1:42"/>
 <a href="cantor_1.html#K1">UniCl</a> <font color="Maroon">B</font> is    <a href="cantor_1.html#M2">prebasis</a> of <font color="Maroon">T</font>
 ;<br/>

<a NAME="E2:42"/><b>then </b>
 <a href="cantor_1.html#K2">FinMeetCl</a> <span class="p1">(<span class="default"><a href="cantor_1.html#K1">UniCl</a> <font color="Maroon">B</font></span>)</span> is    <a href="cantor_1.html#M1">Basis</a> of <font color="Maroon">T</font>
 
<b>by </b><i/>;<br/>
<a NAME="E3:42"/><b>then </b>
 <a href="cantor_1.html#K1">UniCl</a> <span class="p1">(<span class="default"><a href="cantor_1.html#K2">FinMeetCl</a> <span class="p2">(<span class="default"><a href="cantor_1.html#K1">UniCl</a> <font color="Maroon">B</font></span>)</span></span>)</span> <a href="hidden.html#R1">=</a> the <a href="pre_topc.html#U1">topology</a> of <font color="Maroon">T</font>
 
<b>by </b><i/>;<br/>
<a NAME="E4:42"/><b>then </b>
 <a href="cantor_1.html#K1">UniCl</a> <span class="p1">(<span class="default"><a href="cantor_1.html#K2">FinMeetCl</a> <font color="Maroon">B</font></span>)</span> <a href="hidden.html#R1">=</a> the <a href="pre_topc.html#U1">topology</a> of <font color="Maroon">T</font>
 
<b>by </b><i/>;<br/>
<a NAME="E5:42"/><b>then </b>
 <a href="cantor_1.html#K2">FinMeetCl</a> <font color="Maroon">B</font> is    <a href="cantor_1.html#M1">Basis</a> of <font color="Maroon">T</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E6:42"/>
<font color="Maroon">B</font> is    <a href="cantor_1.html#M2">prebasis</a> of <font color="Maroon">T</font>
 <b>by </b><i/>;<br/>


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