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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="E1:27"/><i><font color="Green">E20</font></i>: 
( <font color="Maroon">A</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="rlvect_1.html#K1">0.</a> <font color="Maroon">R</font> &amp; <font color="Maroon">A</font> <a href="group_1.html#K10">*</a> <font color="Maroon">B</font> <a href="gcd_1.html#R2" target="_self">divides</a> <font color="Maroon">A</font> <a href="group_1.html#K10">*</a> <font color="Maroon">C</font> )
 ;<br/>

<b>then consider </b><font color="Maroon">D</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">R</font><b> such that </b><br/><a NAME="E3:27"/><i><font color="Green">E21</font></i>: 
<span class="p1">(<span class="default"><font color="Maroon">A</font> <a href="group_1.html#K10">*</a> <font color="Maroon">B</font></span>)</span> <a href="group_1.html#K10">*</a> <font color="Maroon">D</font> <a href="hidden.html#R1">=</a> <font color="Maroon">A</font> <a href="group_1.html#K10">*</a> <font color="Maroon">C</font>
 <b>by </b><i/>;<br/>
<a NAME="E4:27"/><i><font color="Green">E25</font></i>: 
<font color="Maroon">A</font> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">B</font> <a href="group_1.html#K10">*</a> <font color="Maroon">D</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">A</font> <a href="group_1.html#K10">*</a> <font color="Maroon">C</font>
 
<b>by </b><i><a class="txt" href="gcd_1.html#E1:27"><i><font color="Green">E20</font></i></a>, <a class="ref" href="group_1.html#D4">GROUP_1:def 4</a></i>;<br/>
<a NAME="E5:27"/><i><font color="Green">E26</font></i>: 
<span class="p1">(<span class="default"><font color="Maroon">A</font> <a href="group_1.html#K10">*</a> <span class="p2">(<span class="default"><font color="Maroon">B</font> <a href="group_1.html#K10">*</a> <font color="Maroon">D</font></span>)</span></span>)</span> <a href="gcd_1.html#K1" target="_self">/</a> <font color="Maroon">A</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">A</font> <a href="gcd_1.html#K1" target="_self">/</a> <font color="Maroon">A</font></span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">B</font> <a href="group_1.html#K10">*</a> <font color="Maroon">D</font></span>)</span>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="27_1"><b>proof </b></a><div class="add">

<a NAME="E1:27_1"/>
<font color="Maroon">A</font> <a href="gcd_1.html#R2" target="_self">divides</a> <font color="Maroon">A</font> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">B</font> <a href="group_1.html#K10">*</a> <font color="Maroon">D</font></span>)</span>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:27_1"/>
<span class="p1">(<span class="default"><font color="Maroon">A</font> <a href="group_1.html#K10">*</a> <span class="p2">(<span class="default"><font color="Maroon">B</font> <a href="group_1.html#K10">*</a> <font color="Maroon">D</font></span>)</span></span>)</span> <a href="gcd_1.html#K1" target="_self">/</a> <font color="Maroon">A</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">A</font> <a href="gcd_1.html#K1" target="_self">/</a> <font color="Maroon">A</font></span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">B</font> <a href="group_1.html#K10">*</a> <font color="Maroon">D</font></span>)</span>
 <b>by </b><i>, </i>;<br/>


</div><b>end;</b></div>
<a NAME="E6:27"/><i><font color="Green">E53</font></i>: 
<span class="p1">(<span class="default"><font color="Maroon">A</font> <a href="group_1.html#K10">*</a> <font color="Maroon">C</font></span>)</span> <a href="gcd_1.html#K1" target="_self">/</a> <font color="Maroon">A</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">A</font> <a href="gcd_1.html#K1" target="_self">/</a> <font color="Maroon">A</font></span>)</span> <a href="group_1.html#K10">*</a> <font color="Maroon">C</font>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="27_2"><b>proof </b></a><div class="add">

<a NAME="E1:27_2"/>
<font color="Maroon">A</font> <a href="gcd_1.html#R2" target="_self">divides</a> <font color="Maroon">A</font> <a href="group_1.html#K10">*</a> <font color="Maroon">C</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:27_2"/>
<span class="p1">(<span class="default"><font color="Maroon">A</font> <a href="group_1.html#K10">*</a> <font color="Maroon">C</font></span>)</span> <a href="gcd_1.html#K1" target="_self">/</a> <font color="Maroon">A</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">A</font> <a href="gcd_1.html#K1" target="_self">/</a> <font color="Maroon">A</font></span>)</span> <a href="group_1.html#K10">*</a> <font color="Maroon">C</font>
 <b>by </b><i>, </i>;<br/>


</div><b>end;</b></div>
<font color="Maroon">B</font> <a href="group_1.html#K10">*</a> <font color="Maroon">D</font> = 
<span class="p1">(<span class="default"><a href="group_1.html#K2">1.</a> <font color="Maroon">R</font></span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">B</font> <a href="group_1.html#K10">*</a> <font color="Maroon">D</font></span>)</span>
<b>by </b><i><a class="ref" href="vectsp_1.html#D19">VECTSP_1:def 19</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">A</font> <a href="gcd_1.html#K1" target="_self">/</a> <font color="Maroon">A</font></span>)</span> <a href="group_1.html#K10">*</a> <font color="Maroon">C</font>
<b>by </b><i>, <a class="txt" href="gcd_1.html#E3:27"><i><font color="Green">E21</font></i></a>, , , </i>
<br/>.= 
<span class="p1">(<span class="default"><a href="group_1.html#K2">1.</a> <font color="Maroon">R</font></span>)</span> <a href="group_1.html#K10">*</a> <font color="Maroon">C</font>
<b>by </b><i>, </i>
<br/>.= 
<font color="Maroon">C</font>
<b>by </b><i><a class="ref" href="vectsp_1.html#D19">VECTSP_1:def 19</a></i>
;<br/>
<b>hence </b><a NAME="E8:27"/>
<font color="Maroon">B</font> <a href="gcd_1.html#R2" target="_self">divides</a> <font color="Maroon">C</font>
 <b>by </b><i/>;<br/>


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