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



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

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


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