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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E19">Th27</font></span>: <a NAME="T27"><span class="comment"><font color="firebrick">:: LOPCLSET:27</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">X</font> being   non  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>   <a href="hidden.html#M2" title="HIDDEN:mode.2">set</a>   holds <br/> not  for <font color="Olive" title="b2">Y</font> being    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="finsub_1.html#K5" title="FINSUB_1:func.5">Fin</a> <font color="Olive" title="b1">X</font> holds  <font color="Olive" title="b2">Y</font> is  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a> </div></div>
