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<b>let </b><font color="Maroon">r</font> be  <a href="xreal_0.html#V1">real</a>  <a href="ordinal1.html#NM1" target="_self">number</a> ;<br/>

<b>assume </b><a NAME="E1:8"/>
<font color="Maroon">r</font> is   <a href="int_1.html#NM1">Integer</a>
 ;<br/>

<a NAME="E2:8"/><b>then </b>
<font color="Maroon">r</font> is    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K4">INT</a> 
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:8"/>
 ex <font color="Olive">k</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>  st <br/>( <font color="Maroon">r</font> <a href="hidden.html#R1">=</a> <font color="Olive">k</font> or <font color="Maroon">r</font> <a href="hidden.html#R1">=</a>  <a href="real_1.html#K1">-</a> <font color="Olive">k</font> )
 <b>by </b><i/>;<br/>


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