<?xml version="1.0"?>
<div><span class="kw">theorem </span><a NAME="T21"><span class="comment"><font color="firebrick">:: FINTOPO7:21</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">ET</font> being   <a href="fintopo7.html#NM3" title="FINTOPO7:NM.3">FMT_TopSpace</a><br/>  for <font color="Olive" title="b2">B</font> being   <a href="fintopo7.html#NM4" title="FINTOPO7:NM.4">Basis</a> of <font color="Olive" title="b1">ET</font> holds   <a href="fintopo7.html#K4" title="FINTOPO7:func.4">Family_open_set</a> <font color="Olive" title="b1">ET</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="cantor_1.html#K1" title="CANTOR_1:func.1">UniCl</a> <font color="Olive" title="b2">B</font></div></div>
