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<b>let </b><font color="Maroon" title="c1">F</font>, <font color="Maroon" title="c2">X</font> be    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/>



<b>assume </b><a NAME="E1:96"/>
<font color="Maroon" title="c2">X</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c1">F</font>
 ;<br/>

<a NAME="E2:96"/><b>then </b>
 <a href="setfam_1.html#K1" title="SETFAM_1:func.1">meet</a> <font color="Maroon" title="c1">F</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a> <font color="Maroon" title="c2">X</font>
 
<b>by </b><i><a class="ref" href="setfam_1.html#T4" title="SETFAM_1:th.4">SETFAM_1:4</a></i>;<br/>
<b>hence </b><a NAME="E3:96"/>
(  not <font color="Maroon" title="c2">X</font> is <a href="membered.html#V3" title="MEMBERED:attr.3">rational-membered</a> or  <a href="setfam_1.html#K1" title="SETFAM_1:func.1">meet</a> <font color="Maroon" title="c1">F</font> is <a href="membered.html#V3" title="MEMBERED:attr.3">rational-membered</a> )
 <b>by </b><i><a class="ref" href="membered.html#T18" target="_self" title="MEMBERED:th.18">Th18</a></i>;<br/>


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