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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E3">Th2</font></span>: <a NAME="T2"><span class="comment"><font color="firebrick">:: ORDINAL6:2</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="ordinal6.html#V1" title="ORDINAL6:attr.1">ordinal-membered</a>  iff  <a href="ordinal1.html#K2" title="ORDINAL1:func.2">On</a> <font color="Olive" title="b1">X</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b1">X</font> )</div></div>
