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<div><span class="kw">theorem </span><a NAME="T45"><span class="comment"><font color="firebrick">:: HELLY:45</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">T</font> being   <a href="helly.html#NM1" title="HELLY:NM.1">_Tree</a><br/>  for <font color="Olive" title="b2">a</font>, <font color="Olive" title="b3">b</font>, <font color="Olive" title="b4">c</font> being   <a href="glib_000.html#NM10" title="GLIB_000:NM.10">Vertex</a> of <font color="Olive" title="b1">T</font> holds   <a href="helly.html#K3" title="HELLY:func.3">MiddleVertex</a> (<font color="Olive" title="b2">a</font>,<font color="Olive" title="b3">b</font>,<font color="Olive" title="b4">c</font>) <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="helly.html#K3" title="HELLY:func.3">MiddleVertex</a> (<font color="Olive" title="b4">c</font>,<font color="Olive" title="b3">b</font>,<font color="Olive" title="b2">a</font>)</div></div>
