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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E26">Th79</font></span>: <a NAME="T79"><span class="comment"><font color="firebrick">:: ZF_LANG1:79</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">x</font> being   <a href="zf_lang.html#NM1" title="ZF_LANG:NM.1">Variable</a><br/>  for <font color="Olive" title="b2">M</font> being   non  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>   <a href="hidden.html#M2" title="HIDDEN:mode.2">set</a>  holds  <font color="Olive" title="b2">M</font> <a href="zf_model.html#R2" title="ZF_MODEL:pred.2">|=</a> <font color="Olive" title="b1">x</font> <a href="zf_lang.html#K3" title="ZF_LANG:func.3">'='</a> <font color="Olive" title="b1">x</font> <span class="kw">by</span> <span class="lab"><a class="ref" href="zf_lang1.html#T78" target="_self" onmouseover="rs('zf_lang1/T78')" onmouseout="rh()">Th78</a></span>;<br/></div></div>
