<?xml version="1.0"?>
<div><span class="kw">theorem </span><a NAME="T15"><span class="comment"><font color="firebrick">:: FINTOPO5:15</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">n</font>, <font color="Olive" title="b2">m</font> being   non  <a href="ordinal1.html#V8" title="ORDINAL1:attr.8">zero</a>  <a href="ordinal1.html#NM6" title="ORDINAL1:NM.6">Nat</a> holds   <a href="fintopo5.html#K5" title="FINTOPO5:func.5">FTSS2</a> (<font color="Olive" title="b1">n</font>,<font color="Olive" title="b2">m</font>) is  <a href="fin_topo.html#V1" title="FIN_TOPO:attr.1">symmetric</a> </div></div>
