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<b>let </b><font color="Maroon">n</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/>

<a NAME="E1:7"/>
<font color="Maroon">n</font> <a href="nat_1.html#K10">hcf</a> <font color="Maroon">n</font> <a href="hidden.html#R1">=</a> <font color="Maroon">n</font>
 
;<br/>
<b>hence </b><a NAME="E2:7"/>
( <font color="Maroon">n</font>,<font color="Maroon">n</font> <a href="int_2.html#R2">are_relative_prime</a>  iff <font color="Maroon">n</font> <a href="hidden.html#R1">=</a> 1 )
 <b>by </b><i><a class="ref" href="int_2.html#D6">INT_2:def 6</a></i>;<br/>


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