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



<b>assume </b><a NAME="E1:3"/><i><font color="Green">E27</font></i>: 
( <font color="Maroon">A</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">B</font> &amp; <font color="Maroon">A</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">C</font> )
 ;<br/>

<a NAME="E2:3"/><b>then </b>
<span class="p1">(<span class="default"><font color="Maroon">R</font> <a href="relat_1.html#K7">|</a> <font color="Maroon">C</font></span>)</span> <a href="relat_1.html#K7">|</a> <font color="Maroon">A</font> <a href="hidden.html#R1">=</a> <font color="Maroon">R</font> <a href="relat_1.html#K7">|</a> <font color="Maroon">A</font>
 
<b>by </b><i><a class="ref" href="relat_1.html#T103">RELAT_1:103</a></i>;<br/>
<b>hence </b><a NAME="E3:3"/>
<span class="p1">(<span class="default"><font color="Maroon">R</font> <a href="relat_1.html#K7">|</a> <font color="Maroon">B</font></span>)</span> <a href="relat_1.html#K7">|</a> <font color="Maroon">A</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">R</font> <a href="relat_1.html#K7">|</a> <font color="Maroon">C</font></span>)</span> <a href="relat_1.html#K7">|</a> <font color="Maroon">A</font>
 <b>by </b><i>, <a class="ref" href="relat_1.html#T103">RELAT_1:103</a></i>;<br/>


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