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<b>let </b><font color="Maroon">A</font> be   <a href="ordinal1.html#NM2">Ordinal</a>;<br/><b>let </b><font color="Maroon">B</font> be   <a href="ordinal1.html#NM2">Ordinal</a>;<br/>



<b>assume </b><a NAME="E1:60"/>
(  <a href="card_1.html#K1">Card</a> <font color="Maroon">A</font> <a href="card_1.html#NR2" target="_self">&lt;`</a>  <a href="card_1.html#K1">Card</a> <font color="Maroon">B</font> &amp; not <font color="Maroon">A</font> <a href="hidden.html#R2">in</a> <font color="Maroon">B</font> )
 ;<br/>

<a NAME="E2:60"/><b>then </b>
( not  <a href="card_1.html#K1">Card</a> <font color="Maroon">B</font> <a href="card_1.html#NR1" target="_self">&lt;=`</a>  <a href="card_1.html#K1">Card</a> <font color="Maroon">A</font> &amp; <font color="Maroon">B</font> <a href="ordinal1.html#R1">c=</a> <font color="Maroon">A</font> )
 
<b>by </b><i><a class="ref" href="card_1.html#T14">CARD_1:14</a>, <a class="ref" href="ordinal1.html#T26">ORDINAL1:26</a></i>;<br/>
<b>hence </b><a NAME="E3:60"/>
contradiction
 <b>by </b><i><a class="ref" href="card_1.html#T27">CARD_1:27</a></i>;<br/>


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