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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E27">Th37</font></span>: <a NAME="T37"><span class="comment"><font color="firebrick">:: ZF_LANG:37</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>  st <font color="Olive" title="b1">H</font> is  <a href="zf_lang.html#V3" title="ZF_LANG:attr.3">being_membership</a>  holds <br/><font color="Olive" title="b1">H</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K17" title="ZF_LANG:func.17">Var1</a> <font color="Olive" title="b1">H</font></span>)</span> <a href="zf_lang.html#K4" title="ZF_LANG:func.4">'in'</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K18" title="ZF_LANG:func.18">Var2</a> <font color="Olive" title="b1">H</font></span>)</span></div></div>
