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

<b>let </b><font color="Maroon">a</font> be    <a href="hidden.html#M1">set</a> ;<br/>

<a NAME="E1:65"/>
 <a href="finseq_1.html#K3">len</a> <span class="p1">(<span class="default">0 <a href="finseq_2.html#K2" target="_self">|-&gt;</a> <font color="Maroon">a</font></span>)</span> <a href="hidden.html#R1">=</a> 0
 
<b>by </b><i><a class="ref" href="finseq_2.html#T10" target="_self">Th10</a></i>;<br/>
<b>hence </b><a NAME="E2:65"/>
0 <a href="finseq_2.html#K2" target="_self">|-&gt;</a> <font color="Maroon">a</font> <a href="hidden.html#R1">=</a>  <a href="xboole_0.html#K1">{}</a> 
 <b>by </b><i><a class="ref" href="finseq_1.html#T25">FINSEQ_1:25</a></i>;<br/>


</div>
