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<b>let </b><font color="Maroon">c<sub>3</sub></font>, <font color="Maroon">c<sub>4</sub></font>, <font color="Maroon">c<sub>5</sub></font> be   <a href="card_1.html#NM1">Cardinal</a>;<br/>





<b>assume </b><a NAME="E1:8_1_1"/>
<font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a>  <a href="card_1.html#K1">Card</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="ordinal2.html#K10">+^</a> <font color="Maroon">c<sub>5</sub></font></span>)</span>
 ;<br/>

<b>hence </b><font color="Maroon">c<sub>3</sub></font> = 
 <a href="card_1.html#K1">Card</a> <font color="Maroon">H<sub>2</sub></font>(<font color="Maroon">c<sub>5</sub></font>,<font color="Maroon">c<sub>4</sub></font>)
<b>by </b><i><a class="txt" href="card_2.html#E8"><i><font color="Green">Lemma3</font></i></a></i>
<br/>.= 
 <a href="card_1.html#K1">Card</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="ordinal2.html#K10">+^</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>
<b>by </b><i><a class="txt" href="card_2.html#E8"><i><font color="Green">Lemma3</font></i></a></i>
;<br/><br/>


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