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

<a NAME="E1:25"/>
<font color="Maroon">K</font> <a href="hidden.html#R1">=</a>  <a href="card_1.html#K1">Card</a> <font color="Maroon">K</font>
 
<b>by </b><i><a class="ref" href="card_1.html#D5">CARD_1:def 5</a></i>;<br/>
<a NAME="E2:25"/><b>then </b>
( <font color="Maroon">K</font> <a href="card_2.html#K2" target="_self">*`</a> 1 <a href="hidden.html#R1">=</a>  <a href="card_1.html#K1">Card</a> <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><font color="Maroon">K</font>,1</span><a href="zfmisc_1.html#K2">:]</a></span> &amp; <font color="Maroon">K</font> <a href="hidden.html#R1">=</a>  <a href="card_1.html#K1">Card</a> <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><font color="Maroon">K</font>,<span class="p2"><a href="tarski.html#K1">{</a><span class="default"><a href="xboole_0.html#K1">{}</a> </span><a href="tarski.html#K1">}</a></span></span><a href="zfmisc_1.html#K2">:]</a></span> &amp;  <a href="card_1.html#K1">Card</a> <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><font color="Maroon">K</font>,<span class="p2"><a href="tarski.html#K1">{</a><span class="default"><a href="xboole_0.html#K1">{}</a> </span><a href="tarski.html#K1">}</a></span></span><a href="zfmisc_1.html#K2">:]</a></span> <a href="hidden.html#R1">=</a>  <a href="card_1.html#K1">Card</a> <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><span class="p2"><a href="tarski.html#K1">{</a><span class="default"><a href="xboole_0.html#K1">{}</a> </span><a href="tarski.html#K1">}</a></span>,<font color="Maroon">K</font></span><a href="zfmisc_1.html#K2">:]</a></span> )
 
<b>by </b><i>, </i>;<br/>
<b>hence </b><a NAME="E3:25"/>
<font color="Maroon">K</font> <a href="card_2.html#K2" target="_self">*`</a> 1 <a href="hidden.html#R1">=</a> <font color="Maroon">K</font>
 <b>by </b><i><a class="ref" href="ordinal3.html#T18">ORDINAL3:18</a></i>;<br/>


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