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<b>let </b><font color="Maroon">Y</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">X</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">R</font> be    <a href="relset_1.html#M2" target="_self">Relation</a> of <font color="Maroon">X</font>,<font color="Maroon">Y</font>;<br/>





<a NAME="E1:40"/>
( <font color="Maroon">R</font> <a href="relset_1.html#K11" target="_self">"</a> <font color="Maroon">Y</font> <a href="hidden.html#R1">=</a>  <a href="relset_1.html#K4" target="_self">dom</a> <font color="Maroon">R</font> &amp; <font color="Maroon">R</font> <a href="relset_1.html#K10" target="_self">.:</a> <font color="Maroon">X</font> <a href="hidden.html#R1">=</a>  <a href="relset_1.html#K5" target="_self">rng</a> <font color="Maroon">R</font> )
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:40"/>
( <font color="Maroon">R</font> <a href="relset_1.html#K10" target="_self">.:</a> <span class="p1">(<span class="default"><font color="Maroon">R</font> <a href="relset_1.html#K11" target="_self">"</a> <font color="Maroon">Y</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="relset_1.html#K5" target="_self">rng</a> <font color="Maroon">R</font> &amp; <font color="Maroon">R</font> <a href="relset_1.html#K11" target="_self">"</a> <span class="p1">(<span class="default"><font color="Maroon">R</font> <a href="relset_1.html#K10" target="_self">.:</a> <font color="Maroon">X</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="relset_1.html#K4" target="_self">dom</a> <font color="Maroon">R</font> )
 <b>by </b><i><a class="ref" href="relat_1.html#T146">RELAT_1:146</a>, <a class="ref" href="relat_1.html#T169">RELAT_1:169</a></i>;<br/>


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