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<div><span class="kw">theorem </span><a NAME="T132"><span class="comment"><font color="firebrick">:: SEQ_4:132</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">n</font> being   <a href="ordinal1.html#NM6" title="ORDINAL1:NM.6">Nat</a><br/>  for <font color="Olive" title="b2">A</font> being   <a href="subset_1.html#NM2" title="SUBSET_1:NM.2">Subset</a> of <span class="p1">(<span class="default"><a href="seq_4.html#K12" title="SEQ_4:func.12">COMPLEX</a> <font color="Olive" title="b1">n</font></span>)</span> holds <br/> ( <font color="Olive" title="b2">A</font> is  <a href="seq_4.html#V2" title="SEQ_4:attr.2">closed</a>  iff <font color="Olive" title="b2">A</font> <a href="subset_1.html#K3" title="SUBSET_1:func.3">`</a>  is  <a href="seq_4.html#V1" title="SEQ_4:attr.1">open</a>  )</div></div>
