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<b>let </b><font color="Maroon">I</font> be  <a href="group_1.html#V7">commutative</a> non <a href="vectsp_1.html#V10">degenerated</a> <a href="vectsp_2.html#V2">domRing-like</a> <a href="funcsdom.html#NM1">Ring</a>;<br/><b>let </b><font color="Maroon">u</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="quofield.html#K9" target="_self">Quot.</a> <font color="Maroon">I</font>;<br/>



<i><font color="Green">E20</font></i>: <span class="p1">(<span class="default"><a href="quofield.html#K17" target="_self">quotadd</a> <font color="Maroon">I</font></span>)</span> <a href="binop_1.html#K2">.</a> <font color="Maroon">u</font>,<span class="p1">(<span class="default"><a href="quofield.html#K13" target="_self">q0.</a> <font color="Maroon">I</font></span>)</span> = 
 <a href="quofield.html#K10" target="_self">qadd</a> <font color="Maroon">u</font>,<span class="p1">(<span class="default"><a href="quofield.html#K13" target="_self">q0.</a> <font color="Maroon">I</font></span>)</span>
<b>by </b><i><a class="ref" href="quofield.html#T4" target="_self">Th4</a></i>
<br/>.= 
<font color="Maroon">u</font>
<b>by </b><i/>
;<br/>
<span class="p1">(<span class="default"><a href="quofield.html#K17" target="_self">quotadd</a> <font color="Maroon">I</font></span>)</span> <a href="binop_1.html#K2">.</a> <span class="p1">(<span class="default"><a href="quofield.html#K13" target="_self">q0.</a> <font color="Maroon">I</font></span>)</span>,<font color="Maroon">u</font> = 
 <a href="quofield.html#K10" target="_self">qadd</a> <span class="p1">(<span class="default"><a href="quofield.html#K13" target="_self">q0.</a> <font color="Maroon">I</font></span>)</span>,<font color="Maroon">u</font>
<b>by </b><i><a class="ref" href="quofield.html#T4" target="_self">Th4</a></i>
<br/>.= 
<font color="Maroon">u</font>
<b>by </b><i/>
;<br/>
<b>hence </b><a NAME="E3:44"/>
( <span class="p1">(<span class="default"><a href="quofield.html#K17" target="_self">quotadd</a> <font color="Maroon">I</font></span>)</span> <a href="binop_1.html#K2">.</a> <font color="Maroon">u</font>,<span class="p1">(<span class="default"><a href="quofield.html#K13" target="_self">q0.</a> <font color="Maroon">I</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">u</font> &amp; <span class="p1">(<span class="default"><a href="quofield.html#K17" target="_self">quotadd</a> <font color="Maroon">I</font></span>)</span> <a href="binop_1.html#K2">.</a> <span class="p1">(<span class="default"><a href="quofield.html#K13" target="_self">q0.</a> <font color="Maroon">I</font></span>)</span>,<font color="Maroon">u</font> <a href="hidden.html#R1">=</a> <font color="Maroon">u</font> )
 <b>by </b><i/>;<br/>


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