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<b>let </b><font color="Maroon">G</font> be   <a href="glib_003.html#NM3">VGraph</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>assume </b><a NAME="E1:183"/><i><font color="Green">E30</font></i>: 
<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/>

<a NAME="E2:183"/>
 <a href="glib_003.html#K7" target="_self">the_VLabel_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> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><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="p2">(<span class="default"><span class="p3">(<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="p3">(<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></span>)</span> <a href="funct_1.html#K1">.</a> <a href="glib_003.html#K4" target="_self">VLabelSelector</a> 
 
<b>by </b><i>, </i>;<br/>
<b>hence </b><a NAME="E3:183"/>
 <a href="glib_003.html#K7" target="_self">the_VLabel_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> <a href="hidden.html#R1">=</a> <span class="p1">(<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="p1">(<span class="default"><font color="Maroon">e</font> <a href="cqc_lang.html#K3">.--&gt;</a> <font color="Maroon">x</font></span>)</span>
 <b>by </b><i><a class="ref" href="glib_000.html#T11">GLIB_000:11</a></i>;<br/>


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