<?xml version="1.0"?>
<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E14">Th6</font></span>: <a NAME="T13"><span class="comment"><font color="firebrick">:: RELAT_2:13</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">R</font> being   <a href="relat_1.html#NM1" title="RELAT_1:NM.1">Relation</a> holds <br/> ( <font color="Olive" title="b1">R</font> is  <a href="relat_2.html#V3" title="RELAT_2:attr.3">symmetric</a>  iff <font color="Olive" title="b1">R</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b1">R</font> <a href="relat_1.html#K2" title="RELAT_1:func.2">~</a>  )</div></div>
