<?xml version="1.0"?>
<div>:: <span class="kw">deftheorem </span>   defines <a href="surrealo.html#R4" title="SURREALO:pred.4">&lt;==&gt;</a> <a onclick="hs(this)" href="javascript:()">SURREALO:def 4 : <br/></a><span> for <font color="Olive" title="b1">X</font>, <font color="Olive" title="b2">Y</font> being    <a href="hidden.html#M2" title="HIDDEN:mode.2">set</a>  holds <br/> ( <font color="Olive" title="b1">X</font> <a href="surrealo.html#R4" title="SURREALO:pred.4">&lt;==&gt;</a> <font color="Olive" title="b2">Y</font> iff ( <font color="Olive" title="b1">X</font> <a href="surrealo.html#R3" title="SURREALO:pred.3">&lt;=_</a> <font color="Olive" title="b2">Y</font> &amp; <font color="Olive" title="b2">Y</font> <a href="surrealo.html#R3" title="SURREALO:pred.3">&lt;=_</a> <font color="Olive" title="b1">X</font> ) );<br/></span></div>
