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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E15">Th20</font></span>: <a NAME="T20"><span class="comment"><font color="firebrick">:: ZFREFLE1:20</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">A</font>, <font color="Olive" title="b2">B</font> being   <a href="ordinal1.html#NM3" title="ORDINAL1:NM.3">Ordinal</a>  st <font color="Olive" title="b1">A</font> <a href="ordinal2.html#R2" title="ORDINAL2:pred.2">is_cofinal_with</a> <font color="Olive" title="b2">B</font> holds <br/><font color="Olive" title="b2">B</font> <a href="ordinal1.html#R1" title="ORDINAL1:pred.1">c=</a> <font color="Olive" title="b1">A</font></div></div>
