<?xml version="1.0"?>
<div><span class="kw">theorem </span><a NAME="T75"><span class="comment"><font color="firebrick">:: ORDINAL3:75</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#K11" title="ORDINAL2:func.11">*^</a> <font color="Olive" title="b2">b</font> is  <a href="ordinal1.html#V7" title="ORDINAL1:attr.7">natural</a>  &amp;  not <font color="Olive" title="b1">a</font> <a href="ordinal2.html#K11" title="ORDINAL2:func.11">*^</a> <font color="Olive" title="b2">b</font> is  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>  holds <br/>( <font color="Olive" title="b1">a</font> <a href="tarski.html#R2" title="TARSKI:pred.2">in</a>  <a href="ordinal1.html#K4" title="ORDINAL1:func.4">omega</a>  &amp; <font color="Olive" title="b2">b</font> <a href="tarski.html#R2" title="TARSKI:pred.2">in</a>  <a href="ordinal1.html#K4" title="ORDINAL1:func.4">omega</a>  )</div></div>
