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<div><span class="kw">theorem </span><a NAME="T11"><span class="comment"><font color="firebrick">:: ISOMICHI:11</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> holds <br/> (  <a href="struct_0.html#K2" title="STRUCT_0:func.2">[#]</a> <font color="Olive" title="b1">T</font> is  <a href="isomichi.html#NV4" title="ISOMICHI:NV.4">regular_open</a>  &amp;  <a href="struct_0.html#K2" title="STRUCT_0:func.2">[#]</a> <font color="Olive" title="b1">T</font> is  <a href="isomichi.html#NV5" title="ISOMICHI:NV.5">regular_closed</a>  )</div></div>
