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<b>let </b><font color="Maroon">j</font> be   <a href="int_1.html#NM1">Integer</a>;<br/>

<a NAME="E1:57"/>
( <font color="Maroon">j</font> <a href="xxreal_0.html#R1">&lt;</a> 0 or ( <font color="Maroon">j</font> is    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>  &amp; ( <font color="Maroon">j</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> 0 or <font color="Maroon">j</font> <a href="hidden.html#R1">=</a> 0 ) ) )
 
<b>by </b><i><a class="ref" href="int_1.html#T16">INT_1:16</a></i>;<br/>
<b>hence </b><a NAME="E2:57"/>
( <font color="Maroon">j</font> <a href="xxreal_0.html#NR2" target="_self">&gt;=</a> 1 or <font color="Maroon">j</font> <a href="hidden.html#R1">=</a> 0 or <font color="Maroon">j</font> <a href="xxreal_0.html#R1">&lt;</a> 0 )
 <b>by </b><i><a class="ref" href="nat_1.html#T39">NAT_1:39</a></i>;<br/>


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