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

<font color="Maroon">j</font> <a href="binarith.html#K3">-'</a> <font color="Maroon">j</font> = 
<font color="Maroon">j</font> <a href="real_1.html#K5">-</a> <font color="Maroon">j</font>
<b>by </b><i><a class="ref" href="binarith.html#T50">BINARITH:50</a></i>
<br/>.= 
0

;<br/>
<b>hence </b><a NAME="E2:2"/>
<span class="p1">(<span class="default"><font color="Maroon">j</font> <a href="binarith.html#K3">-'</a> <font color="Maroon">j</font></span>)</span> <a href="nat_1.html#K1">+</a> 1 <a href="hidden.html#R1">=</a> 1
 ;<br/>


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