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<div><span class="kw">theorem </span><a NAME="T28"><span class="comment"><font color="firebrick">:: YELLOW_9:28</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">T</font> being   <a href="pre_topc.html#NM1" title="PRE_TOPC:NM.1">TopSpace</a><br/>  for <font color="Olive" title="b2">K</font> being   <a href="cantor_1.html#NM2" title="CANTOR_1:NM.2">prebasis</a> of <font color="Olive" title="b1">T</font> holds  <font color="Olive" title="b2">K</font> is  <a href="tops_2.html#V1" title="TOPS_2:attr.1">open</a>  ;<br/></div></div>
