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<div><span class="kw">theorem </span><a NAME="T3"><span class="comment"><font color="firebrick">:: CANTOR_1:3</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">S</font> being    <a href="pre_topc.html#L1" title="PRE_TOPC:struct.1">TopStruct</a>  holds   the <a href="pre_topc.html#U1" title="PRE_TOPC:sel.1">topology</a> of <font color="Olive" title="b1">S</font> is  <a href="tops_2.html#V1" title="TOPS_2:attr.1">open</a>  ;<br/></div></div>
