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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E22">Th20</font></span>: <a NAME="T20"><span class="comment"><font color="firebrick">:: GRAPH_3:20</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">G</font> being   <a href="graph_1.html#NM3" title="GRAPH_1:NM.3">Graph</a><br/>  for <font color="Olive" title="b2">v</font> being   <a href="graph_3.html#NM2" title="GRAPH_3:NM.2">Vertex</a> of <font color="Olive" title="b1">G</font><br/>  for <font color="Olive" title="b3">X</font> being    <a href="hidden.html#M2" title="HIDDEN:mode.2">set</a>  holds   <a href="graph_3.html#K2" title="GRAPH_3:func.2">Edges_In</a> (<font color="Olive" title="b2">v</font>,<font color="Olive" title="b3">X</font>) <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a>  <a href="graph_3.html#K5" title="GRAPH_3:func.5">Edges_In</a> <font color="Olive" title="b2">v</font></div></div>
