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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">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="E1:5"/><i><font color="Green">E24</font></i>: 
<font color="Maroon">X</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">Y</font>
 ;<br/>

<a NAME="E2:5"/><b>then </b>
<font color="Maroon">X</font> <a href="relat_1.html#K8">|</a> <font color="Maroon">R</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">Y</font> <a href="relat_1.html#K8">|</a> <font color="Maroon">R</font>
 
<b>by </b><i><a class="ref" href="relat_1.html#T131">RELAT_1:131</a></i>;<br/>
<a NAME="E3:5"/><b>then </b><i><font color="Green">E26</font></i>: 
<span class="p1">(<span class="default"><font color="Maroon">X</font> <a href="relat_1.html#K8">|</a> <font color="Maroon">R</font></span>)</span> <a href="relat_1.html#K7">|</a> <font color="Maroon">X</font> <a href="tarski.html#R1">c=</a> <span class="p1">(<span class="default"><font color="Maroon">Y</font> <a href="relat_1.html#K8">|</a> <font color="Maroon">R</font></span>)</span> <a href="relat_1.html#K7">|</a> <font color="Maroon">X</font>
 
<b>by </b><i><a class="ref" href="relat_1.html#T105">RELAT_1:105</a></i>;<br/>
<a NAME="E4:5"/>
<span class="p1">(<span class="default"><font color="Maroon">Y</font> <a href="relat_1.html#K8">|</a> <font color="Maroon">R</font></span>)</span> <a href="relat_1.html#K7">|</a> <font color="Maroon">X</font> <a href="tarski.html#R1">c=</a> <span class="p1">(<span class="default"><font color="Maroon">Y</font> <a href="relat_1.html#K8">|</a> <font color="Maroon">R</font></span>)</span> <a href="relat_1.html#K7">|</a> <font color="Maroon">Y</font>
 
<b>by </b><i>, <a class="ref" href="relat_1.html#T104">RELAT_1:104</a></i>;<br/>
<a NAME="E5:5"/><b>then </b>
<span class="p1">(<span class="default"><font color="Maroon">X</font> <a href="relat_1.html#K8">|</a> <font color="Maroon">R</font></span>)</span> <a href="relat_1.html#K7">|</a> <font color="Maroon">X</font> <a href="tarski.html#R1">c=</a> <span class="p1">(<span class="default"><font color="Maroon">Y</font> <a href="relat_1.html#K8">|</a> <font color="Maroon">R</font></span>)</span> <a href="relat_1.html#K7">|</a> <font color="Maroon">Y</font>
 
<b>by </b><i>, <a class="ref" href="xboole_1.html#T1">XBOOLE_1:1</a></i>;<br/>
<a NAME="E6:5"/><b>then </b>
<font color="Maroon">R</font> <a href="wellord1.html#K2">|_2</a> <font color="Maroon">X</font> <a href="tarski.html#R1">c=</a> <span class="p1">(<span class="default"><font color="Maroon">Y</font> <a href="relat_1.html#K8">|</a> <font color="Maroon">R</font></span>)</span> <a href="relat_1.html#K7">|</a> <font color="Maroon">Y</font>
 
<b>by </b><i><a class="ref" href="wellord1.html#T17">WELLORD1:17</a></i>;<br/>
<b>hence </b><a NAME="E7:5"/>
<font color="Maroon">R</font> <a href="wellord1.html#K2">|_2</a> <font color="Maroon">X</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">R</font> <a href="wellord1.html#K2">|_2</a> <font color="Maroon">Y</font>
 <b>by </b><i><a class="ref" href="wellord1.html#T17">WELLORD1:17</a></i>;<br/>


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