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<b>let </b><font color="Maroon" title="c3">P</font> be   <a href="rfunct_3.html#NM2" title="RFUNCT_3:NM.2">PFUNC_DOMAIN</a> of <font color="Maroon" title="c1">X</font>,<font color="Maroon" title="c2">Y</font>;<br/><b>let </b><font color="Maroon" title="c4">x</font> be    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="fraenkel.html#D1" title="FRAENKEL:def.1">FRAENKEL:def 1</a><br/>



<b>assume </b><a NAME="E1:21_1_1"/>
<font color="Maroon" title="c4">x</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c3">P</font>
 ;<br/>

<b>hence </b><a NAME="E2:21_1_1"/>
<font color="Maroon" title="c4">x</font> is    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> 
 <b>by </b><i><a class="ref" href="rfunct_3.html#D3" title="RFUNCT_3:def.3">RFUNCT_3:def 3</a></i>;<br/>


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