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<b>let </b><font color="Maroon" title="c1">n</font> be    <a href="ordinal1.html#NM1" title="ORDINAL1:NM.1">number</a> ;<br/>

<b>assume </b><a NAME="E1:71_1_1"/>
<font color="Maroon" title="c1">n</font> is <a href="ordinal1.html#V7" title="ORDINAL1:attr.7">natural</a>
 ;<br/>

<b>then reconsider </b><font color="Maroon" title="c2">n</font> = <font color="Maroon" title="c1">n</font> as    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="ordinal1.html#K5" title="ORDINAL1:func.5">omega</a>  <b>by </b><i><a class="ref" href="ordinal1.html#D13" target="_self" title="ORDINAL1:def.13">Def13</a></i>;<br/>
<a NAME="E3:71_1_1"/>
<font color="Maroon" title="c2">n</font> is <a href="ordinal1.html#V3" title="ORDINAL1:attr.3">ordinal</a>
 
;<br/>
<b>hence </b><a NAME="E4:71_1_1"/>
<font color="Maroon" title="c1">n</font> is <a href="ordinal1.html#V3" title="ORDINAL1:attr.3">ordinal</a>
 ;<br/>


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