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<b>let </b><font color="Maroon">U</font> be   <a href="classes2.html#NM1">Universe</a>;<br/><b>let </b><font color="Maroon">X</font> be    <a href="hidden.html#M1">set</a> , <font color="Maroon">Y</font> be    <a href="hidden.html#M1">set</a> ;<br/>



<b>assume </b><a NAME="E1:1"/>
( <font color="Maroon">X</font> <a href="hidden.html#R2">in</a> <font color="Maroon">U</font> &amp; <font color="Maroon">Y</font> <a href="hidden.html#R2">in</a> <font color="Maroon">U</font> )
 ;<br/>

<a NAME="E2:1"/><b>then </b>
<span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><font color="Maroon">X</font>,<font color="Maroon">Y</font></span><a href="zfmisc_1.html#K2">:]</a></span> <a href="hidden.html#R2">in</a> <font color="Maroon">U</font>
 
<b>by </b><i><a class="ref" href="classes2.html#T67">CLASSES2:67</a></i>;<br/>
<b>hence </b><a NAME="E3:1"/>
for <font color="Olive">R</font> being   <a href="relset_1.html#M2">Relation</a> of <font color="Maroon">X</font>,<font color="Maroon">Y</font> holds  <font color="Olive">R</font> <a href="hidden.html#R2">in</a> <font color="Maroon">U</font>
 <b>by </b><i><a class="ref" href="classes1.html#D1">CLASSES1:def 1</a></i>;<br/>


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