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<b>let </b><font color="Maroon">a</font> be  <a href="ordinal1.html#V7">natural</a> <a href="ordinal1.html#NM2">Ordinal</a>;<br/>

<a NAME="E1:41"/>
<font color="Maroon">a</font>,1 <a href="arytm_3.html#R1" target="_self">are_relative_prime</a> 
 
<b>by </b><i/>;<br/>
<a NAME="E2:41"/><b>then </b>
<font color="Maroon">a</font> <a href="arytm_3.html#K5" target="_self">hcf</a> 1 <a href="hidden.html#R1">=</a> 1
 
<b>by </b><i><a class="ref" href="arytm_3.html#T4" target="_self">Th4</a></i>;<br/>
<a NAME="E3:41"/><b>then </b>
( <font color="Maroon">a</font> <a href="ordinal3.html#K6">div^</a> <span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="arytm_3.html#K5" target="_self">hcf</a> 1</span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">a</font> &amp; 1 <a href="ordinal3.html#K6">div^</a> <span class="p1">(<span class="default">1 <a href="arytm_3.html#K5" target="_self">hcf</a> <font color="Maroon">a</font></span>)</span> <a href="hidden.html#R1">=</a> 1 )
 
<b>by </b><i><a class="ref" href="ordinal3.html#T84">ORDINAL3:84</a></i>;<br/>
<b>hence </b><a NAME="E4:41"/>
(  <a href="arytm_3.html#K6" target="_self">RED</a> <font color="Maroon">a</font>,1 <a href="hidden.html#R1">=</a> <font color="Maroon">a</font> &amp;  <a href="arytm_3.html#K6" target="_self">RED</a> 1,<font color="Maroon">a</font> <a href="hidden.html#R1">=</a> 1 )
 ;<br/>


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