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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E12">Th6</font></span>: <a NAME="T6"><span class="comment"><font color="firebrick">:: MEMBERED:6</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>   st <font color="Olive" title="b1">X</font> is  <a href="membered.html#V6" title="MEMBERED:attr.6">natural-membered</a>  holds <br/><font color="Olive" title="b1">X</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a>  <a href="numbers.html#NK1" title="NUMBERS:NK.1">NAT</a>  <span class="kw">by</span> <span class="lab"><a class="ref" href="ordinal1.html#D12" onmouseover="rs('ordinal1/D12')" onmouseout="rh()">ORDINAL1:def 12</a></span>;<br/></div></div>
