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<div class="add">

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

<b>thus </b><a NAME="E1:13"/>
<font color="Maroon">a</font> <a href="int_1.html#R2">divides</a> 0
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="13_1"><b>proof </b></a><div class="add">

<a NAME="E1:13_1"/>
0 <a href="hidden.html#R1">=</a> <font color="Maroon">a</font> <a href="xcmplx_0.html#K3">*</a> 0
 
;<br/>
<b>hence </b><a NAME="E2:13_1"/>
<font color="Maroon">a</font> <a href="int_1.html#R2">divides</a> 0
 <b>by </b><i><a class="ref" href="int_1.html#D9">INT_1:def 9</a></i>;<br/>


</div><b>end;</b></div>

<b>thus </b><a NAME="E2:13"/>
1 <a href="int_1.html#R2">divides</a> <font color="Maroon">a</font>
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="13_2"><b>proof </b></a><div class="add">

<a NAME="E1:13_2"/>
<font color="Maroon">a</font> <a href="hidden.html#R1">=</a> 1 <a href="xcmplx_0.html#K3">*</a> <font color="Maroon">a</font>
 
;<br/>
<b>hence </b><a NAME="E2:13_2"/>
1 <a href="int_1.html#R2">divides</a> <font color="Maroon">a</font>
 <b>by </b><i><a class="ref" href="int_1.html#D9">INT_1:def 9</a></i>;<br/>


</div><b>end;</b></div>

<a NAME="E3:13"/>
<font color="Maroon">a</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="xcmplx_0.html#K4">-</a> 1</span>)</span> <a href="xcmplx_0.html#K3">*</a> <span class="p1">(<span class="default"><a href="xcmplx_0.html#K4">-</a> <font color="Maroon">a</font></span>)</span>
 
;<br/>
<b>hence </b><a NAME="E4:13"/>
 <a href="xcmplx_0.html#K4">-</a> 1 <a href="int_1.html#R2">divides</a> <font color="Maroon">a</font>
 <b>by </b><i><a class="ref" href="int_1.html#D9">INT_1:def 9</a></i>;<br/>


</div>
