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<b>let </b><font color="Maroon">n</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/>

<a NAME="E1:23"/>
( not <font color="Maroon">n</font> is <a href="abian.html#V1">even</a> iff  not <font color="Maroon">n</font> <a href="nat_1.html#K6">mod</a> 2 <a href="hidden.html#R1">=</a> 0 )
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:23"/>
( not <font color="Maroon">n</font> is <a href="abian.html#V1">even</a> iff <font color="Maroon">n</font> <a href="nat_1.html#K6">mod</a> 2 <a href="hidden.html#R1">=</a> 1 )
 <b>by </b><i><a class="ref" href="nat_1.html#T62">NAT_1:62</a></i>;<br/>


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