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<b>let </b><font color="Maroon">X</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">Y</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">R</font> be   <a href="relat_1.html#NM1">Relation</a>;<br/>





<a NAME="E1:152"/>
<font color="Maroon">R</font> <a href="relat_1.html#K7" target="_self">|</a> <font color="Maroon">X</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">R</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:152"/>
<span class="p1">(<span class="default"><font color="Maroon">R</font> <a href="relat_1.html#K7" target="_self">|</a> <font color="Maroon">X</font></span>)</span> <a href="relat_1.html#K9" target="_self">.:</a> <font color="Maroon">Y</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">R</font> <a href="relat_1.html#K9" target="_self">.:</a> <font color="Maroon">Y</font>
 <b>by </b><i/>;<br/>


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