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

<a NAME="E1:63_1_1"/>
1 <a href="hidden.html#R2">in</a>  <a href="graph_5.html#K8" target="_self">Real&gt;=0</a> 
 
;<br/>
<b>hence </b><a NAME="E2:63_1_1"/>
not  <a href="graph_5.html#K8" target="_self">Real&gt;=0</a>  is <a href="xboole_0.html#V1">empty</a>
 ;<br/>


</div>
