<?xml version="1.0"?>
<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E36">Th12</font></span>: <a NAME="T12"><span class="comment"><font color="firebrick">:: FINTOPO8:12</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">NT</font> being   <a href="fintopo8.html#NM1" title="FINTOPO8:NM.1">NTopSpace</a><br/>  for <font color="Olive" title="b2">A</font> being   <a href="struct_0.html#NM2" title="STRUCT_0:NM.2">Subset</a> of <font color="Olive" title="b1">NT</font> holds <br/> ( <font color="Olive" title="b2">A</font> is  <a href="fintopo7.html#V1" title="FINTOPO7:attr.1">open</a>  iff  <a href="fintopo8.html#K4" title="FINTOPO8:func.4">Int</a> <font color="Olive" title="b2">A</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b2">A</font> )</div></div>
