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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/>



<b>assume </b><a NAME="E1:25"/>
( <font color="Maroon">a</font> <a href="card_1.html#NR1" target="_self">&lt;=`</a> <font color="Maroon">M</font> or <font color="Maroon">a</font> <a href="card_1.html#NR2" target="_self">&lt;`</a> <font color="Maroon">M</font> )
 ;<br/>

<a NAME="E2:25"/><b>then </b>
(  <a href="card_1.html#K3">alef</a> 0 <a href="card_1.html#NR1" target="_self">&lt;=`</a> <font color="Maroon">a</font> &amp; <font color="Maroon">a</font> <a href="card_1.html#NR1" target="_self">&lt;=`</a> <font color="Maroon">M</font> )
 
<b>by </b><i>, <a class="ref" href="card_1.html#T13">CARD_1:13</a></i>;<br/>
<a NAME="E3:25"/><b>then </b>
 <a href="card_1.html#K3">alef</a> 0 <a href="card_1.html#NR1" target="_self">&lt;=`</a> <font color="Maroon">M</font>
 
<b>by </b><i><a class="ref" href="xboole_1.html#T1">XBOOLE_1:1</a></i>;<br/>
<b>hence </b><a NAME="E4:25"/>
<font color="Maroon">M</font> is   <a href="card_5.html#NM1">Aleph</a>
 <b>by </b><i><a class="ref" href="card_4.html#T11">CARD_4:11</a></i>;<br/>


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