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<b>let </b><font color="Maroon">c<sub>2</sub></font>, <font color="Maroon">c<sub>3</sub></font>, <font color="Maroon">c<sub>4</sub></font> be   <a href="card_1.html#NM1">Cardinal</a>;<br/>





<b>assume </b><b>that </b><br/><a NAME="E1:66"/><i><font color="Green">E47</font></i>: 
( <font color="Maroon">c<sub>2</sub></font> <a href="card_1.html#NR2" target="_self">&lt;`</a> <font color="Maroon">c<sub>3</sub></font> or <font color="Maroon">c<sub>2</sub></font> <a href="card_1.html#NR1" target="_self">&lt;=`</a> <font color="Maroon">c<sub>3</sub></font> )
 <b>and </b><br/><a NAME="E2:66"/><i><font color="Green">E48</font></i>: 
<font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> 0
 ;<br/>

<b>thus </b><a NAME="E3:66"/>
 <a href="card_2.html#K3">exp</a> <font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>2</sub></font> <a href="card_1.html#NR1" target="_self">&lt;=`</a>  <a href="card_2.html#K3">exp</a> <font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>3</sub></font>
 <b>by </b><i><a class="txt" href="card_4.html#E1:66"><i><font color="Green">E47</font></i></a>, <a class="txt" href="card_4.html#E2:66"><i><font color="Green">E48</font></i></a>, <a class="ref" href="card_4.html#T70" target="_self">Th70</a></i>;<br/>

<a NAME="E4:66"/>
( <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a> 0 implies  <a href="card_2.html#K3">exp</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R1">=</a> 0 )
 
<b>by </b><i><a class="txt" href="card_4.html#E2:66"><i><font color="Green">E48</font></i></a>, <a class="ref" href="card_2.html#T39">CARD_2:39</a></i>;<br/>
<b>hence </b><a NAME="E5:66"/>
 <a href="card_2.html#K3">exp</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>4</sub></font> <a href="card_1.html#NR1" target="_self">&lt;=`</a>  <a href="card_2.html#K3">exp</a> <font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>4</sub></font>
 <b>by </b><i><a class="txt" href="card_4.html#E1:66"><i><font color="Green">E47</font></i></a>, <a class="ref" href="card_4.html#T19" target="_self">Th19</a>, <a class="ref" href="card_4.html#T70" target="_self">Th70</a></i>;<br/>


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