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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E8">ThSubset</font></span>: <a NAME="T23"><span class="comment"><font color="firebrick">:: COUNTERS:23</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">X</font> being    <a href="hidden.html#M2" title="HIDDEN:mode.2">set</a>  holds <br/> ( <font color="Olive" title="b1">X</font> is  <a href="counters.html#V2" title="COUNTERS:attr.2">ext-natural-membered</a>  iff <font color="Olive" title="b1">X</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a>  <a href="counters.html#K1" title="COUNTERS:func.1">ExtNAT</a>  )</div></div>
