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

<b>assume </b><a NAME="E1:26"/><i><font color="Green">E40</font></i>: 
<font color="Maroon">a</font> <a href="nat_1.html#R1">divides</a> 1
 ;<br/>

<a NAME="E2:26"/><b>then </b>
<font color="Maroon">a</font> <a href="nat_1.html#R1">divides</a> 1 <a href="nat_1.html#K1">+</a> 1
 
<b>by </b><i><a class="ref" href="nat_1.html#T55">NAT_1:55</a></i>;<br/>
<b>hence </b><a NAME="E3:26"/>
<font color="Maroon">a</font> <a href="hidden.html#R1">=</a> 1
 <b>by </b><i>, <a class="ref" href="newton.html#T52">NEWTON:52</a></i>;<br/>


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