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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E41">Th56</font></span>: <a NAME="T56"><span class="comment"><font color="firebrick">:: ORDINAL3:56</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">A</font> being   <a href="ordinal1.html#NM3" title="ORDINAL1:NM.3">Ordinal</a> holds <br/> ( <font color="Olive" title="b1">A</font> <a href="ordinal3.html#K5" title="ORDINAL3:func.5">-^</a> <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b1">A</font> &amp; <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> <a href="ordinal3.html#K5" title="ORDINAL3:func.5">-^</a> <font color="Olive" title="b1">A</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  )</div></div>
