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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>;<br/>



<b>assume </b><a NAME="E1:28"/>
<font color="Maroon">A</font> <a href="gcd_1.html#R4" target="_self">is_associated_to</a>  <a href="rlvect_1.html#K1">0.</a> <font color="Maroon">R</font>
 ;<br/>

<a NAME="E2:28"/><b>then </b>
 <a href="rlvect_1.html#K1">0.</a> <font color="Maroon">R</font> <a href="gcd_1.html#R2" target="_self">divides</a> <font color="Maroon">A</font>
 
<b>by </b><i/>;<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="E4:28"/><i><font color="Green">E20</font></i>: 
<span class="p1">(<span class="default"><a href="rlvect_1.html#K1">0.</a> <font color="Maroon">R</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>
 <b>by </b><i/>;<br/>
<b>thus </b><a NAME="E5:28"/>
<font color="Maroon">A</font> <a href="hidden.html#R1">=</a>  <a href="rlvect_1.html#K1">0.</a> <font color="Maroon">R</font>
 <b>by </b><i>, <a class="ref" href="vectsp_1.html#T39">VECTSP_1:39</a></i>;<br/>


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