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<div><span class="kw">theorem </span><a NAME="T5"><span class="comment"><font color="firebrick">:: FINTOPO8:5</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> holds <br/> (  <a href="struct_0.html#K2" title="STRUCT_0:func.2">[#]</a> <font color="Olive" title="b1">NT</font> is  <a href="fintopo7.html#V1" title="FINTOPO7:attr.1">open</a>  &amp;  <a href="struct_0.html#K1" title="STRUCT_0:func.1">{}</a> <font color="Olive" title="b1">NT</font> is  <a href="fintopo7.html#V1" title="FINTOPO7:attr.1">open</a>  ) ;<br/></div></div>
