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

<b>set </b><font color="Maroon">s</font> = <span class="p1"><a href="seq_4.html#K1">{</a><span class="default">1</span><a href="seq_4.html#K1">}</a></span>;<br/>
<b>take </b>
<span class="p1"><a href="seq_4.html#K1">{</a><span class="default">1</span><a href="seq_4.html#K1">}</a></span>
;<br/>

<b>thus </b><a NAME="E1:4_1_1"/>
not <span class="p1"><a href="seq_4.html#K1">{</a><span class="default">1</span><a href="seq_4.html#K1">}</a></span> is <a href="xboole_0.html#V1">empty</a>
 ;<br/>

<b>thus </b><a NAME="E2:4_1_1"/>
<span class="p1"><a href="seq_4.html#K1">{</a><span class="default">1</span><a href="seq_4.html#K1">}</a></span> is <a href="setfam_1.html#V1">without_zero</a>
 ;<br/>


</div>
