<?xml version="1.0"?>
<div class="add">

<a NAME="E1:50"/>
 <a href="partfun1.html#K6" title="PARTFUN1:func.6">id</a> <span class="p1"><a href="tarski.html#K1" title="TARSKI:func.1">{</a><span class="default"><a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> </span><a href="tarski.html#K1" title="TARSKI:func.1">}</a></span> <a href="relat_2.html#R3" title="RELAT_2:pred.3">is_symmetric_in</a> <span class="p1"><a href="tarski.html#K1" title="TARSKI:func.1">{</a><span class="default"><a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> </span><a href="tarski.html#K1" title="TARSKI:func.1">}</a></span>
 
<span class="kw">by</span> <span class="lab"><a class="ref" href="oposet_1.html#T9" target="_self" title="OPOSET_1:th.9">Th9</a></span>;<br/>
<span class="kw">hence </span><a NAME="E2:50"/>
 <a href="oposet_1.html#K3" title="OPOSET_1:func.3">TrivOrthoRelStr</a>  is  <a href="necklace.html#V1" title="NECKLACE:attr.1">symmetric</a> 
 <span class="kw">by</span> <span class="lab"><a class="ref" href="card_1.html#T87" title="CARD_1:th.87">CARD_1:87</a>, <a class="ref" href="necklace.html#D4" title="NECKLACE:def.4">NECKLACE:def 4</a></span>; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="Red">::  thesis: </font></span></a><span class="hide"> verum</span><br/>


</div>
