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<b>let </b><font color="Maroon">c<sub>2</sub></font> be   <a href="rat_1.html#NM1">Rational</a>;<br/>

<b>assume </b><a NAME="E1:41"/><i><font color="Green">E26</font></i>: 
( (  <a href="rat_1.html#K2" target="_self">numerator</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>2</sub></font> or  <a href="rat_1.html#K1" target="_self">denominator</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a> 1 ) &amp; 0 <a href="xxreal_0.html#R1">&lt;=</a> <font color="Maroon">c<sub>2</sub></font> )
 ;<br/>

<a NAME="E2:41"/><b>then </b>
<font color="Maroon">c<sub>2</sub></font> is   <a href="int_1.html#NM1">Integer</a>
 
<b>by </b><i><a class="ref" href="rat_1.html#T41" target="_self">Th41</a></i>;<br/>
<b>hence </b><a NAME="E3:41"/>
<font color="Maroon">c<sub>2</sub></font> is   <a href="nat_1.html#NM1">Nat</a>
 <b>by </b><i><a class="txt" href="rat_1.html#E1:41"><i><font color="Green">E26</font></i></a>, <a class="ref" href="int_1.html#T16">INT_1:16</a></i>;<br/>


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