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<font color="Maroon" title="c1">x</font> <a href="zf_lang.html#K4" title="ZF_LANG:func.4">'='</a> <font color="Maroon" title="c2">y</font> is    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="zf_lang.html#K9" title="ZF_LANG:func.9">WFF</a> 
 
<span class="kw">by</span> <span class="lab"><a class="ref" href="zf_lang.html#D8" target="_self" title="ZF_LANG:def.8">Def8</a></span>;<br/>
<span class="kw">hence </span><a NAME="E2:27_1_1"/>
<font color="Maroon" title="c1">x</font> <a href="zf_lang.html#K4" title="ZF_LANG:func.4">'='</a> <font color="Maroon" title="c2">y</font> is  <a href="zf_lang.html#V1" title="ZF_LANG:attr.1">ZF-formula-like</a> 
 <span class="kw">by</span> <span class="lab"><a class="ref" href="zf_lang.html#D9" target="_self" title="ZF_LANG:def.9">Def9</a></span>; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="Red">::  thesis: </font></span></a><span class="hide"> verum</span><br/>


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