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<a NAME="E1:9_2_1"/>
 ex <font color="Olive">n</font> being   <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K5">NAT</a>  st  <a href="relat_1.html#K1">dom</a> <font color="Maroon">p</font> <a href="hidden.html#R1">=</a> <font color="Olive">n</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:9_2_1"/>
 <a href="relat_1.html#K1">dom</a> <font color="Maroon">p</font> is <a href="ordinal1.html#V7">natural</a>
 ;<br/>


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