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<b>let </b><font color="Maroon">c<sub>1</sub></font>, <font color="Maroon">c<sub>2</sub></font> be   <a href="nat_1.html#NM1">Nat</a>;<br/>

<b>assume </b><a NAME="E1:6"/>
<font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font> <a href="int_2.html#R2">are_relative_prime</a> 
 ;<br/>

<a NAME="E2:6"/><b>then </b>
(  not <font color="Maroon">c<sub>1</sub></font> is <a href="abian.html#V1">even</a> or  not <font color="Maroon">c<sub>2</sub></font> is <a href="abian.html#V1">even</a> )
 
<b>by </b><i><a class="ref" href="pythtrip.html#T10">PYTHTRIP:10</a></i>;<br/>
<b>hence </b><a NAME="E3:6"/>
( <font color="Maroon">c<sub>1</sub></font> <a href="xxreal_0.html#NR4" target="_self">&gt;</a> 0 or <font color="Maroon">c<sub>2</sub></font> <a href="xxreal_0.html#NR4" target="_self">&gt;</a> 0 )
 <b>by </b><i><a class="ref" href="heyting3.html#T1">HEYTING3:1</a></i>;<br/>


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