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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">f</font> be   <a href="relat_1.html#NM1">Relation</a>, <font color="Maroon">g</font> be   <a href="relat_1.html#NM1">Relation</a>;<br/>



<b>assume </b><a NAME="E1:177"/>
(  <a href="relat_1.html#K1" target="_self">dom</a> <font color="Maroon">g</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">X</font> &amp; <font color="Maroon">g</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">f</font> )
 ;<br/>

<a NAME="E2:177"/><b>then </b>
<font color="Maroon">g</font> <a href="relat_1.html#K7" target="_self">|</a> <span class="p1">(<span class="default"><a href="relat_1.html#K1" target="_self">dom</a> <font color="Maroon">g</font></span>)</span> <a href="tarski.html#R1">c=</a> <font color="Maroon">f</font> <a href="relat_1.html#K7" target="_self">|</a> <font color="Maroon">X</font>
 
<b>by </b><i><a class="ref" href="relat_1.html#T13" target="_self">Th13</a></i>;<br/>
<b>hence </b><a NAME="E3:177"/>
<font color="Maroon">g</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">f</font> <a href="relat_1.html#K7" target="_self">|</a> <font color="Maroon">X</font>
 <b>by </b><i><a class="txt" href="relat_1.html#E8"><i><font color="Green">Lemma43</font></i></a></i>;<br/>


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