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<b>let </b><font color="Maroon" title="c2">x</font> be    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/>

<a NAME="E1:14"/>
( <font color="Maroon" title="c2">x</font> is   <a href="rat_1.html#NM1" title="RAT_1:NM.1">Rational</a> iff <font color="Maroon" title="c2">x</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="numbers.html#K3" title="NUMBERS:func.3">RAT</a>  )
 
<b>by </b><i><a class="ref" href="rat_1.html#D2" target="_self" title="RAT_1:def.2">Def2</a></i>;<br/>
<b>hence </b><a NAME="E2:14"/>
(  ex <font color="Olive" title="b1">m</font>, <font color="Olive" title="b2">n</font> being  <a href="int_1.html#NM1" title="INT_1:NM.1">Integer</a> st <font color="Maroon" title="c2">x</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b1">m</font> <a href="xcmplx_0.html#K7" title="XCMPLX_0:func.7">/</a> <font color="Olive" title="b2">n</font> implies <font color="Maroon" title="c2">x</font> is <a href="rat_1.html#V1" title="RAT_1:attr.1">rational</a> )
 <b>by </b><i><a class="ref" href="rat_1.html#D1" target="_self" title="RAT_1:def.1">Def1</a></i>;<br/>


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