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<b>let </b><font color="Maroon">G</font> be   <a href="glib_003.html#NM6">EVGraph</a>;<br/><b>let </b><font color="Maroon">e</font> be    <a href="hidden.html#M1">set</a> , <font color="Maroon">x</font> be    <a href="hidden.html#M1">set</a> ;<br/>



<b>set </b><font color="Maroon">G2</font> = <font color="Maroon">G</font> <a href="glib_003.html#K13" target="_self">.labelVertex</a> <font color="Maroon">e</font>,<font color="Maroon">x</font>;<br/>
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="187_1"><b>now </b></a><div class="add"><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="187_1_1"><b>per </b></a><a class="txt" onclick="hs(this)" href="javascript:()"><b>cases </b></a><span class="hide"><a NAME="E1:187_1_1"/>
( <font color="Maroon">e</font> <a href="hidden.html#R2">in</a>  <a href="glib_000.html#K6">the_Vertices_of</a> <font color="Maroon">G</font> or  not <font color="Maroon">e</font> <a href="hidden.html#R2">in</a>  <a href="glib_000.html#K6">the_Vertices_of</a> <font color="Maroon">G</font> )
 </span>;<br/><div class="add"><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="187_1_1_1"><b>suppose </b></a><a NAME="E1:187_1_1_1"/>
<font color="Maroon">e</font> <a href="hidden.html#R2">in</a>  <a href="glib_000.html#K6">the_Vertices_of</a> <font color="Maroon">G</font>
 ;<br/><div class="add"><a NAME="E2:187_1_1_1"/><b>then </b><i><font color="Green">E30</font></i>: 
<font color="Maroon">G</font> <a href="glib_003.html#K13" target="_self">.labelVertex</a> <font color="Maroon">e</font>,<font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">G</font> <a href="glib_000.html#K13">.set</a> <a href="glib_003.html#K4" target="_self">VLabelSelector</a> ,<span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="glib_003.html#K7" target="_self">the_VLabel_of</a> <font color="Maroon">G</font></span>)</span> <a href="funct_4.html#K1">+*</a> <span class="p2">(<span class="default"><font color="Maroon">e</font> <a href="cqc_lang.html#K3">.--&gt;</a> <font color="Maroon">x</font></span>)</span></span>)</span>
 <b>by </b><i/>;<br/><b>thus </b><a NAME="E3:187_1_1_1"/>
 <a href="glib_003.html#K6" target="_self">the_ELabel_of</a> <font color="Maroon">G</font> <a href="hidden.html#R1">=</a>  <a href="glib_003.html#K6" target="_self">the_ELabel_of</a> <span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="glib_003.html#K13" target="_self">.labelVertex</a> <font color="Maroon">e</font>,<font color="Maroon">x</font></span>)</span>
 <b>by </b><i>, <a class="ref" href="glib_000.html#T12">GLIB_000:12</a></i>;<br/></div><b>end;</b></div><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="187_1_1_2"><b>suppose </b></a><a NAME="E1:187_1_1_2"/>
not <font color="Maroon">e</font> <a href="hidden.html#R2">in</a>  <a href="glib_000.html#K6">the_Vertices_of</a> <font color="Maroon">G</font>
 ;<br/><div class="add"><b>hence </b><a NAME="E2:187_1_1_2"/>
 <a href="glib_003.html#K6" target="_self">the_ELabel_of</a> <font color="Maroon">G</font> <a href="hidden.html#R1">=</a>  <a href="glib_003.html#K6" target="_self">the_ELabel_of</a> <span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="glib_003.html#K13" target="_self">.labelVertex</a> <font color="Maroon">e</font>,<font color="Maroon">x</font></span>)</span>
 <b>by </b><i/>;<br/></div><b>end;</b></div></div><b>end;</b></div></div><b>end;</b></div>
<b>hence </b><a NAME="E2:187"/>
 <a href="glib_003.html#K6" target="_self">the_ELabel_of</a> <font color="Maroon">G</font> <a href="hidden.html#R1">=</a>  <a href="glib_003.html#K6" target="_self">the_ELabel_of</a> <span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="glib_003.html#K13" target="_self">.labelVertex</a> <font color="Maroon">e</font>,<font color="Maroon">x</font></span>)</span>
 ;<br/>


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