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<b>let </b><font color="Maroon">G</font> be   <a href="graph_1.html#NM1">Graph</a>;<br/>

<a NAME="E1:8"/>
(  <a href="relat_1.html#K2">rng</a> the <a href="graph_1.html#U3">Source</a> of <font color="Maroon">G</font> <a href="tarski.html#R1">c=</a> the <a href="graph_1.html#U1">Vertices</a> of <font color="Maroon">G</font> &amp;  <a href="relat_1.html#K2">rng</a> the <a href="graph_1.html#U4">Target</a> of <font color="Maroon">G</font> <a href="tarski.html#R1">c=</a> the <a href="graph_1.html#U1">Vertices</a> of <font color="Maroon">G</font> )
 
<b>by </b><i><a class="ref" href="relset_1.html#T12">RELSET_1:12</a></i>;<br/>
<b>hence </b><a NAME="E2:8"/>
<span class="p1">(<span class="default"><a href="relat_1.html#K2">rng</a> the <a href="graph_1.html#U3">Source</a> of <font color="Maroon">G</font></span>)</span> <a href="xboole_0.html#K2">\/</a> <span class="p1">(<span class="default"><a href="relat_1.html#K2">rng</a> the <a href="graph_1.html#U4">Target</a> of <font color="Maroon">G</font></span>)</span> <a href="tarski.html#R1">c=</a> the <a href="graph_1.html#U1">Vertices</a> of <font color="Maroon">G</font>
 <b>by </b><i><a class="ref" href="xboole_1.html#T8">XBOOLE_1:8</a></i>;<br/>


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