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<b>let </b><font color="Maroon" title="c1">M</font> be   <a href="card_1.html#NM1" title="CARD_1:NM.1">Cardinal</a>;<br/>

<a NAME="E1:17"/>
0 <a href="nat_1.html#K1" title="NAT_1:func.1">+</a> 1 <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> 1
 
;<br/>
<a NAME="E2:17"/><b>then </b>
 <a href="card_1.html#K2" title="CARD_1:func.2">nextcard</a> <span class="p1">(<span class="default"><a href="card_1.html#K1" title="CARD_1:func.1">Card</a> 0</span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="card_1.html#K1" title="CARD_1:func.1">Card</a> 1
 
<b>by </b><i><a class="ref" href="card_1.html#T76" title="CARD_1:th.76">CARD_1:76</a></i>;<br/>
<b>hence </b><a NAME="E3:17"/>
( 0 <a href="card_1.html#NR2" title="CARD_1:NR.2">&lt;`</a> <font color="Maroon" title="c1">M</font> iff 1 <a href="card_1.html#NR1" title="CARD_1:NR.1">&lt;=`</a> <font color="Maroon" title="c1">M</font> )
 <b>by </b><i><a class="txt" href="card_4.html#E1"><i><font color="Green" title="E1">Lm1</font></i></a>, <a class="ref" href="card_4.html#T22" target="_self" title="CARD_4:th.22">Th22</a></i>;<br/>


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