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<a NAME="E1:1"/>
0 <a href="hidden.html#R2">in</a>  <a href="ordinal1.html#K5">omega</a> 
 
<b>by </b><i><a class="ref" href="ordinal1.html#D12">ORDINAL1:def 12</a></i>;<br/>
<b>hence </b><a NAME="E2:1"/>
0 is    <a href="subset_1.html#M1">Element</a> of  <a href="ordinal1.html#K5">omega</a> 
 <b>by </b><i><a class="ref" href="subset_1.html#D2">SUBSET_1:def 2</a></i>;<br/>


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