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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E7">Th23</font></span>: <a NAME="T23"><span class="comment"><font color="firebrick">:: SUBSET_1:23</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">E</font> being    <a href="hidden.html#M2" title="HIDDEN:mode.2">set</a> <br/>  for <font color="Olive" title="b2">A</font>, <font color="Olive" title="b3">B</font> being   <a href="subset_1.html#NM2" title="SUBSET_1:NM.2">Subset</a> of <font color="Olive" title="b1">E</font> holds <br/> ( <font color="Olive" title="b2">A</font> <a href="xboole_0.html#R1" title="XBOOLE_0:pred.1">misses</a> <font color="Olive" title="b3">B</font> iff <font color="Olive" title="b2">A</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a> <font color="Olive" title="b3">B</font> <a href="subset_1.html#K3" title="SUBSET_1:func.3">`</a>  )</div></div>
