<?xml version="1.0"?>
<div class="add">

<a NAME="E1:33"/>
ex <font color="Olive">b<sub>1</sub></font> being <a href="ordinal1.html#V7">natural</a>  <a href="ordinal1.html#NM1" target="_self">number</a>  st <br/>( <font color="Olive">b<sub>1</sub></font> <a href="nat_1.html#R1">divides</a> 4 &amp; <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> 1 &amp; <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> 4 )
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="33_1"><b>proof </b></a><div class="add">

<b>take </b>
2
;<br/>

<a NAME="E1:33_1"/>
4 <a href="hidden.html#R1">=</a> 2 <a href="nat_1.html#K2">*</a> 2
 
;<br/>
<b>hence </b><a NAME="E2:33_1"/>
( 2 <a href="nat_1.html#R1">divides</a> 4 &amp; 2 <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> 1 &amp; 2 <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> 4 )
 <b>by </b><i><a class="ref" href="nat_1.html#D3">NAT_1:def 3</a></i>;<br/>


</div><b>end;</b></div>
<b>hence </b><a NAME="E2:33"/>
not 4 is <a href="int_2.html#V1" target="_self">prime</a>
 <b>by </b><i><a class="ref" href="int_2.html#D5" target="_self">Def5</a></i>;<br/>


</div>
