<?xml version="1.0"?>
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<b>consider </b><font color="Maroon">K</font> being   <a href="card_1.html#NM1">Cardinal</a>;<br/>
<a NAME="E2:6"/>
 <a href="xboole_0.html#K1">{}</a>  <a href="hidden.html#R1">=</a> <a href="xboole_0.html#K1">{}</a>  <a href="funcop_1.html#K2">--&gt;</a> <font color="Maroon">K</font>
 
;<br/>
<b>hence </b><a NAME="E3:6"/>
 <a href="xboole_0.html#K1">{}</a>  is   <a href="card_3.html#NM1">Cardinal-Function</a>
 ;<br/>


</div>
