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<b>let </b><font color="Maroon">c<sub>1</sub></font> be    <a href="nat_lat.html#M1" target="_self">Element</a> of  <a href="nat_lat.html#K7" target="_self">NATPLUS</a> ;<br/>

<b>reconsider </b><font color="Maroon">c<sub>2</sub></font> = <font color="Maroon">c<sub>1</sub></font> as    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>  ;<br/>
<a NAME="E2:31_1_1"/>
<font color="Maroon">c<sub>2</sub></font> is <a href="ordinal1.html#V7">natural</a>
 
;<br/>
<b>hence </b><a NAME="E3:31_1_1"/>
<font color="Maroon">c<sub>1</sub></font> is <a href="ordinal1.html#V7">natural</a>
 ;<br/>


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