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<b>let </b><font color="Maroon" title="c1">i1</font> be   <a href="int_1.html#NM1" title="INT_1:NM.1">Integer</a>;<br/>

<b>assume </b><a NAME="E1:21"/><i><font color="Green" title="E13">A1</font></i>: 
 <a href="numbers.html#K6" title="NUMBERS:func.6">0</a>  <a href="xxreal_0.html#NR3" title="XXREAL_0:NR.3">&lt;</a> <font color="Maroon" title="c1">i1</font>
 ;<br/>

<b>then reconsider </b><font color="Maroon" title="c2">i2</font> = <font color="Maroon" title="c1">i1</font> as    <a href="subset_1.html#M2" title="SUBSET_1:mode.2">Element</a> of  <a href="numbers.html#K5" title="NUMBERS:func.5">NAT</a>  <b>by </b><i><a class="ref" href="int_1.html#T16" target="_self" title="INT_1:th.16">Th16</a></i>;<br/>
<a NAME="E3:21"/>
 <a href="numbers.html#K6" title="NUMBERS:func.6">0</a>  <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a> <font color="Maroon" title="c2">i2</font>
 
<b>by </b><i><a class="txt" href="int_1.html#E1:21"><i><font color="Green" title="E13">A1</font></i></a></i>;<br/>
<b>hence </b><a NAME="E4:21"/>
1 <a href="xxreal_0.html#R1" title="XXREAL_0:pred.1">&lt;=</a> <font color="Maroon" title="c1">i1</font>
 <b>by </b><i><a class="txt" href="int_1.html#E25"><i><font color="Green" title="E11">Lm4</font></i></a></i>;<br/>


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