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<div><span class="kw">theorem </span><a NAME="T13"><span class="comment"><font color="firebrick">:: SURREAL0:13</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">A1</font>, <font color="Olive" title="b2">A2</font>, <font color="Olive" title="b3">B1</font>, <font color="Olive" title="b4">B2</font> being   <a href="ordinal1.html#NM3" title="ORDINAL1:NM.3">Ordinal</a><br/>  for <font color="Olive" title="b5">R</font> being   <a href="relat_1.html#NM1" title="RELAT_1:NM.1">Relation</a>  st ( <font color="Olive" title="b1">A1</font> <a href="tarski.html#R2" title="TARSKI:pred.2">in</a> <font color="Olive" title="b2">A2</font> or ( <font color="Olive" title="b1">A1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b2">A2</font> &amp; <font color="Olive" title="b3">B1</font> <a href="ordinal1.html#R1" title="ORDINAL1:pred.1">c=</a> <font color="Olive" title="b4">B2</font> ) ) holds <br/> <a href="surreal0.html#K7" title="SURREAL0:func.7">OpenProd</a> (<font color="Olive" title="b5">R</font>,<font color="Olive" title="b1">A1</font>,<font color="Olive" title="b3">B1</font>) <a href="relset_1.html#R1" title="RELSET_1:pred.1">c=</a>  <a href="surreal0.html#K7" title="SURREAL0:func.7">OpenProd</a> (<font color="Olive" title="b5">R</font>,<font color="Olive" title="b2">A2</font>,<font color="Olive" title="b4">B2</font>)</div></div>
