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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E14">Th21</font></span>: <a NAME="T21"><span class="comment"><font color="firebrick">:: ORDINAL6:21</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   <a href="ordinal6.html#K2" title="ORDINAL6:func.2">numbering</a> <font color="Olive" title="b1">X</font> <a href="wellord1.html#R3" title="WELLORD1:pred.3">is_isomorphism_of</a>  <a href="wellord2.html#K1" title="WELLORD2:func.1">RelIncl</a> <span class="p1">(<span class="default"><a href="ordinal6.html#K1" title="ORDINAL6:func.1">ord-type</a> <font color="Olive" title="b1">X</font></span>)</span>, <a href="wellord2.html#K1" title="WELLORD2:func.1">RelIncl</a> <span class="p1">(<span class="default"><a href="ordinal1.html#K2" title="ORDINAL1:func.2">On</a> <font color="Olive" title="b1">X</font></span>)</span></div></div>
