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<b>reconsider </b><font color="Maroon">X</font> = <span class="p1"><a href="domain_1.html#K8">{</a><span class="default">0,1,2</span><a href="domain_1.html#K8">}</a></span> as  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a>  ;<br/>
<b>consider </b><font color="Maroon">a1</font> being    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">X</font>, <font color="Maroon">k</font> being    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K5">NAT</a> <b> such that </b><br/><a NAME="E3:44_1_1"/><i><font color="Green">E37</font></i>: 
<font color="Maroon">a</font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><font color="Maroon">a1</font>,<font color="Maroon">k</font></span><a href="domain_1.html#K1">]</a></span>
 <b>by </b><i><a class="ref" href="domain_1.html#T9">DOMAIN_1:9</a></i>;<br/>
<a NAME="E4:44_1_1"/>
( <font color="Maroon">a1</font> <a href="hidden.html#R1">=</a> 0 or <font color="Maroon">a1</font> <a href="hidden.html#R1">=</a> 1 or <font color="Maroon">a1</font> <a href="hidden.html#R1">=</a> 2 )
 
<b>by </b><i><a class="ref" href="enumset1.html#D1">ENUMSET1:def 1</a></i>;<br/>
<b>hence </b><a NAME="E5:44_1_1"/>
<font color="Maroon">a</font> <a href="mcart_1.html#K1">`1</a>  is    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K5">NAT</a> 
 <b>by </b><i>, <a class="ref" href="mcart_1.html#T7">MCART_1:7</a></i>;<br/>


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