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<b>let </b><font color="Maroon">R</font> be  <a href="group_1.html#V7">commutative</a> <a href="vectsp_2.html#V2">domRing-like</a> <a href="funcsdom.html#NM1">Ring</a>;<br/><b>let </b><font color="Maroon">a</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font>, <font color="Maroon">b</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font>, <font color="Maroon">c</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font>;<br/>



<b>assume </b><a NAME="E1:25"/><i><font color="Green">E20</font></i>: 
<font color="Maroon">c</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="rlvect_1.html#K1">0.</a> <font color="Maroon">R</font>
 ;<br/>

<b>assume </b><a NAME="E2:25"/><i><font color="Green">E21</font></i>: 
( <font color="Maroon">c</font> <a href="gcd_1.html#R2" target="_self">divides</a> <font color="Maroon">a</font> &amp; <font color="Maroon">c</font> <a href="gcd_1.html#R2" target="_self">divides</a> <font color="Maroon">b</font> )
 ;<br/>

<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="25_1"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:25_1"/>
<font color="Maroon">a</font> <a href="gcd_1.html#K1" target="_self">/</a> <font color="Maroon">c</font> <a href="hidden.html#R1">=</a> <font color="Maroon">b</font> <a href="gcd_1.html#K1" target="_self">/</a> <font color="Maroon">c</font>
 ;<br/><b>consider </b><font color="Maroon">e</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font><b> such that </b><br/><a NAME="E3:25_1"/><i><font color="Green">E25</font></i>: 
<font color="Maroon">e</font> <a href="hidden.html#R1">=</a> <font color="Maroon">b</font> <a href="gcd_1.html#K1" target="_self">/</a> <font color="Maroon">c</font>
 ;<br/><a NAME="E4:25_1"/>
<font color="Maroon">e</font> <a href="group_1.html#K10">*</a> <font color="Maroon">c</font> <a href="hidden.html#R1">=</a> <font color="Maroon">b</font>
 <b>by </b><i>, , , </i>;<br/><b>hence </b><a NAME="E5:25_1"/>
( <font color="Maroon">a</font> <a href="gcd_1.html#K1" target="_self">/</a> <font color="Maroon">c</font> <a href="hidden.html#R1">=</a> <font color="Maroon">b</font> <a href="gcd_1.html#K1" target="_self">/</a> <font color="Maroon">c</font> implies <font color="Maroon">a</font> <a href="hidden.html#R1">=</a> <font color="Maroon">b</font> )
 <b>by </b><i>, , , </i>;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E4:25"/>
( <font color="Maroon">a</font> <a href="gcd_1.html#K1" target="_self">/</a> <font color="Maroon">c</font> <a href="hidden.html#R1">=</a> <font color="Maroon">b</font> <a href="gcd_1.html#K1" target="_self">/</a> <font color="Maroon">c</font> iff <font color="Maroon">a</font> <a href="hidden.html#R1">=</a> <font color="Maroon">b</font> )
 ;<br/>


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