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

<a NAME="E1:6_4_1"/>
<span class="p1"><a href="tarski.html#K4">[</a><span class="default">7,7</span><a href="tarski.html#K4">]</a></span> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2"><a href="tarski.html#K4">[</a><span class="default"><font color="Olive">k</font>,<font color="Olive">l</font></span><a href="tarski.html#K4">]</a></span> where <font color="Olive">k</font> is    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K5">NAT</a> , <font color="Olive">l</font> is    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K5">NAT</a>  : 7 <a href="xxreal_0.html#R1">&lt;=</a> <font color="Olive">k</font> </span>}</span> 
 
;<br/>
<b>hence </b><a NAME="E2:6_4_1"/>
not  <a href="qc_lang1.html#K5" target="_self">QC-pred_symbols</a>  is <a href="xboole_0.html#V1">empty</a>
 ;<br/>


</div>
