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<b>let </b><font color="Maroon">a</font> be    <a href="hidden.html#M1">set</a> ;<br/>

<b>assume </b><a NAME="E1:9_1_1"/>
<font color="Maroon">a</font> <a href="hidden.html#R2">in</a>  <a href="ordinal1.html#K5">omega</a> 
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="ordinal1.html#D13">ORDINAL1:def 13</a><br/>

<a NAME="E2:9_1_1"/><b>then </b>
<font color="Maroon">a</font> is    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K5">NAT</a> 
 
;<br/>
<b>hence </b><a NAME="E3:9_1_1"/>
<font color="Maroon">a</font> is <a href="finset_1.html#V1">finite</a>
 ;<br/>


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