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<b>consider </b><font color="Maroon" title="c1">K</font> being   <a href="card_1.html#NM1" title="CARD_1:NM.1">Cardinal</a>;<br/>
<a NAME="E2:6"/>
 <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  <a href="funcop_1.html#K2" title="FUNCOP_1:func.2">--&gt;</a> <font color="Maroon" title="c1">K</font>
 
;<br/>
<b>hence </b><a NAME="E3:6"/>
 <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  is   <a href="card_3.html#NM1" title="CARD_3:NM.1">Cardinal-Function</a>
 ;<br/>


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