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<b>let </b><font color="Maroon">M</font> be   <a href="card_1.html#NM1">Cardinal</a>;<br/><b>let </b><font color="Maroon">a</font> be   <a href="card_5.html#NM1">Aleph</a>;<br/>



<a NAME="E1:27"/>
1 <a href="card_1.html#NR2" target="_self">&lt;`</a> <font color="Maroon">a</font>
 
<b>by </b><i>, </i>;<br/>
<a NAME="E2:27"/><b>then </b>
( ( <font color="Maroon">M</font> <a href="hidden.html#R1">=</a> 0 &amp;  <a href="xboole_0.html#K1">{}</a>  <a href="ordinal1.html#R1">c=</a>  <a href="card_2.html#K3">exp</a> <font color="Maroon">M</font>,<font color="Maroon">a</font> ) or (  <a href="card_2.html#K3">exp</a> <font color="Maroon">M</font>,1 <a href="card_1.html#NR1" target="_self">&lt;=`</a>  <a href="card_2.html#K3">exp</a> <font color="Maroon">M</font>,<font color="Maroon">a</font> &amp;  <a href="card_2.html#K3">exp</a> <font color="Maroon">M</font>,1 <a href="hidden.html#R1">=</a> <font color="Maroon">M</font> ) )
 
<b>by </b><i><a class="ref" href="card_2.html#T40">CARD_2:40</a>, <a class="ref" href="card_4.html#T71">CARD_4:71</a>, <a class="ref" href="xboole_1.html#T2">XBOOLE_1:2</a></i>;<br/>
<b>hence </b><a NAME="E3:27"/>
<font color="Maroon">M</font> <a href="card_1.html#NR1" target="_self">&lt;=`</a>  <a href="card_2.html#K3">exp</a> <font color="Maroon">M</font>,<font color="Maroon">a</font>
 ;<br/>


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