<?xml version="1.0"?>
<div><span class="kw">theorem </span><a NAME="T90"><span class="comment"><font color="firebrick">:: POLYFORM:90</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">p</font> being   <a href="polyform.html#NM2" title="POLYFORM:NM.2">polyhedron</a>  st <font color="Olive" title="b1">p</font> is  <a href="polyform.html#V5" title="POLYFORM:attr.5">simply-connected</a>  &amp;  <a href="polyform.html#K4" title="POLYFORM:func.4">dim</a> <font color="Olive" title="b1">p</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> 2 holds <br/> <a href="polyform.html#K9" title="POLYFORM:func.9">num-vertices</a> <font color="Olive" title="b1">p</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="polyform.html#K10" title="POLYFORM:func.10">num-edges</a> <font color="Olive" title="b1">p</font></div></div>
