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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E57">Th157</font></span>: <a NAME="T157"><span class="comment"><font color="firebrick">:: ZF_LANG1:157</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">H</font> being   <a href="zf_lang.html#NM2" title="ZF_LANG:NM.2">ZF-formula</a><br/>  for <font color="Olive" title="b2">x</font>, <font color="Olive" title="b3">y</font> being   <a href="zf_lang.html#NM1" title="ZF_LANG:NM.1">Variable</a> holds  <font color="Olive" title="b1">H</font> <a href="zf_lang1.html#K5" title="ZF_LANG1:func.5">/</a> (<font color="Olive" title="b2">x</font>,<font color="Olive" title="b3">y</font>) <a href="tarski.html#R2" title="TARSKI:pred.2">in</a>  <a href="zf_lang.html#K8" title="ZF_LANG:func.8">WFF</a> </div></div>
