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<div><span class="kw">theorem </span><a NAME="T18"><span class="comment"><font color="firebrick">:: GLIBPRE1:18</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">G</font> being   <a href="glib_000.html#NM2" title="GLIB_000:NM.2">_Graph</a> holds <br/> ( <font color="Olive" title="b1">G</font> is  <a href="glib_000.html#V4" title="GLIB_000:attr.4">_trivial</a>  iff  <a href="glib_000.html#K6" title="GLIB_000:func.6">the_Vertices_of</a> <font color="Olive" title="b1">G</font> is  <a href="zfmisc_1.html#V1" title="ZFMISC_1:attr.1">trivial</a>  )</div></div>
