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<b>let </b><font color="Maroon">c<sub>1</sub></font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font> be   <a href="relat_1.html#NM1">Relation</a>;<br/>



<a NAME="E1:138"/>
( <font color="Maroon">c<sub>2</sub></font> <a href="relat_1.html#K9" target="_self">.:</a> <font color="Maroon">c<sub>1</sub></font> <a href="tarski.html#R1">c=</a>  <a href="relat_1.html#K2" target="_self">rng</a> <font color="Maroon">c<sub>2</sub></font> &amp; <font color="Maroon">c<sub>2</sub></font> <a href="relat_1.html#K9" target="_self">.:</a> <span class="p1">(<span class="default"><a href="relat_1.html#K1" target="_self">dom</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="relat_1.html#K2" target="_self">rng</a> <font color="Maroon">c<sub>2</sub></font> )
 
<b>by </b><i><a class="ref" href="relat_1.html#T144" target="_self">Th144</a>, <a class="ref" href="relat_1.html#T146" target="_self">Th146</a></i>;<br/>
<b>hence </b><a NAME="E2:138"/>
<font color="Maroon">c<sub>2</sub></font> <a href="relat_1.html#K9" target="_self">.:</a> <font color="Maroon">c<sub>1</sub></font> <a href="tarski.html#R1">c=</a> <font color="Maroon">c<sub>2</sub></font> <a href="relat_1.html#K9" target="_self">.:</a> <span class="p1">(<span class="default"><a href="relat_1.html#K1" target="_self">dom</a> <font color="Maroon">c<sub>2</sub></font></span>)</span>
 ;<br/>


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