<?xml version="1.0"?>
<div class="add">

<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>, <font color="Maroon">v</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/>



<b>assume </b><a NAME="E1:19"/><i><font color="Green">E20</font></i>: 
<font color="Maroon">u</font> <a href="subset_1.html#K9">/\</a> <font color="Maroon">v</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="xboole_0.html#K1">{}</a> 
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="xboole_0.html#D7">XBOOLE_0:def 7</a><br/>

<b>consider </b><font color="Maroon">x</font> being    <a href="subset_1.html#M2">Element</a> of  <a href="quofield.html#K1" target="_self">Q.</a> <font color="Maroon">I</font><b> such that </b><br/><a NAME="E3:19"/><i><font color="Green">E23</font></i>: 
<font color="Maroon">u</font> <a href="hidden.html#R1">=</a>  <a href="quofield.html#K8" target="_self">QClass.</a> <font color="Maroon">x</font>
 <b>by </b><i/>;<br/>
<b>consider </b><font color="Maroon">y</font> being    <a href="subset_1.html#M2">Element</a> of  <a href="quofield.html#K1" target="_self">Q.</a> <font color="Maroon">I</font><b> such that </b><br/><a NAME="E5:19"/><i><font color="Green">E24</font></i>: 
<font color="Maroon">v</font> <a href="hidden.html#R1">=</a>  <a href="quofield.html#K8" target="_self">QClass.</a> <font color="Maroon">y</font>
 <b>by </b><i/>;<br/>
<a NAME="E6:19"/>
<font color="Maroon">u</font> <a href="xboole_0.html#NR5" target="_self">meets</a> <font color="Maroon">v</font>
 
<b>by </b><i>, <a class="ref" href="xboole_0.html#D7">XBOOLE_0:def 7</a></i>;<br/>
<b>then consider </b><font color="Maroon">w</font> being    <a href="hidden.html#M1">set</a> <b> such that </b><br/><a NAME="E8:19"/><i><font color="Green">E25</font></i>: 
( <font color="Maroon">w</font> <a href="hidden.html#R2">in</a> <font color="Maroon">u</font> &amp; <font color="Maroon">w</font> <a href="hidden.html#R2">in</a> <font color="Maroon">v</font> )
 <b>by </b><i><a class="ref" href="xboole_0.html#T3">XBOOLE_0:3</a></i>;<br/>
<b>reconsider </b><font color="Maroon">w</font> = <font color="Maroon">w</font> as    <a href="subset_1.html#M2">Element</a> of  <a href="quofield.html#K1" target="_self">Q.</a> <font color="Maroon">I</font> <b>by </b><i/>;<br/>
<a NAME="E10:19"/><i><font color="Green">E34</font></i>: 
<span class="p1">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">x</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">x</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span>
 
<b>by </b><i>, , </i>;<br/>
<a NAME="E11:19"/><i><font color="Green">E39</font></i>: 
<span class="p1">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">y</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">y</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span>
 
<b>by </b><i><a class="ref" href="quofield.html#D1" target="_self">Def1</a>, , </i>;<br/>
<a NAME="E12:19"/><i><font color="Green">E40</font></i>: 
for <font color="Olive">z</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="quofield.html#K1" target="_self">Q.</a> <font color="Maroon">I</font>  st <font color="Olive">z</font> <a href="hidden.html#R2">in</a>  <a href="quofield.html#K8" target="_self">QClass.</a> <font color="Maroon">x</font> holds <br/><font color="Olive">z</font> <a href="hidden.html#R2">in</a>  <a href="quofield.html#K8" target="_self">QClass.</a> <font color="Maroon">y</font>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="19_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">z</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="quofield.html#K1" target="_self">Q.</a> <font color="Maroon">I</font>;<br/>

<b>assume </b><a NAME="E1:19_1"/>
<font color="Maroon">z</font> <a href="hidden.html#R2">in</a>  <a href="quofield.html#K8" target="_self">QClass.</a> <font color="Maroon">x</font>
 ;<br/>

<a NAME="E2:19_1"/><b>then </b><i><font color="Green">E41</font></i>: 
<span class="p1">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span>
 
<b>by </b><i>, , </i>;<br/>
<a NAME="E3:19_1"/><b>then </b><i><font color="Green">E53</font></i>: 
<font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a>  <a href="gcd_1.html#R2">divides</a> <span class="p1">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span>
 
<b>by </b><i><a class="ref" href="gcd_1.html#D1">GCD_1:def 1</a></i>;<br/>
<a NAME="E4:19_1"/><b>then </b><i><font color="Green">E54</font></i>: 
<font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a>  <a href="gcd_1.html#R2">divides</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p2">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span></span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">y</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span>
 
<b>by </b><i><a class="ref" href="gcd_1.html#T7">GCD_1:7</a></i>;<br/>
<a NAME="E5:19_1"/>
<font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a>  <a href="gcd_1.html#R2">divides</a> <font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a> 
 
;<br/>
<a NAME="E6:19_1"/><b>then </b><i><font color="Green">E55</font></i>: 
<font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a>  <a href="gcd_1.html#R2">divides</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p2">(<span class="default"><font color="Maroon">y</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span></span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span>
 
<b>by </b><i><a class="ref" href="gcd_1.html#T7">GCD_1:7</a></i>;<br/>
<a NAME="E7:19_1"/><i><font color="Green">E56</font></i>: 
<font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a>  <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="rlvect_1.html#K1">0.</a> <font color="Maroon">I</font>
 
<b>by </b><i/>;<br/>
<b>then </b><span class="p1">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">y</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> = 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p3">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span></span>)</span> <a href="gcd_1.html#K1">/</a> <span class="p2">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span></span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">y</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span>
<b>by </b><i><a class="txt" href="quofield.html#E1:19"><i><font color="Green">E20</font></i></a>, , <a class="ref" href="gcd_1.html#D4">GCD_1:def 4</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p3">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span></span>)</span> <a href="group_1.html#K10">*</a> <span class="p2">(<span class="default"><font color="Maroon">y</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span></span>)</span> <a href="gcd_1.html#K1">/</a> <span class="p1">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span>
<b>by </b><i>, , <a class="txt" href="quofield.html#E5:19"><i><font color="Green">E24</font></i></a>, <a class="ref" href="gcd_1.html#T11">GCD_1:11</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p3">(<span class="default"><font color="Maroon">y</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span></span>)</span></span>)</span> <a href="gcd_1.html#K1">/</a> <span class="p1">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span>
<b>by </b><i>, <a class="ref" href="group_1.html#D4">GROUP_1:def 4</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p3">(<span class="default"><font color="Maroon">y</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span></span>)</span> <a href="group_1.html#K10">*</a> <span class="p2">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span></span>)</span> <a href="gcd_1.html#K1">/</a> <span class="p1">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span>
<b>by </b><i><a class="ref" href="group_1.html#D4">GROUP_1:def 4</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p2">(<span class="default"><font color="Maroon">y</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span></span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="gcd_1.html#K1">/</a> <span class="p2">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span></span>)</span>
<b>by </b><i><a class="txt" href="quofield.html#E3:19"><i><font color="Green">E23</font></i></a>, <a class="txt" href="quofield.html#E5:19"><i><font color="Green">E24</font></i></a>, <a class="ref" href="gcd_1.html#T11">GCD_1:11</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p2">(<span class="default"><font color="Maroon">y</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span></span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><a href="group_1.html#K2">1.</a> <font color="Maroon">I</font></span>)</span>
<b>by </b><i><a class="txt" href="quofield.html#E5:19"><i><font color="Green">E24</font></i></a>, <a class="ref" href="gcd_1.html#T9">GCD_1:9</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">y</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span>
<b>by </b><i><a class="ref" href="vectsp_1.html#D13">VECTSP_1:def 13</a></i>
;<br/>
<b>hence </b><a NAME="E9:19_1"/>
<font color="Maroon">z</font> <a href="hidden.html#R2">in</a>  <a href="quofield.html#K8" target="_self">QClass.</a> <font color="Maroon">y</font>
 <b>by </b><i/>;<br/>


</div><b>end;</b></div>
<a NAME="E13:19"/>
for <font color="Olive">z</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="quofield.html#K1" target="_self">Q.</a> <font color="Maroon">I</font>  st <font color="Olive">z</font> <a href="hidden.html#R2">in</a>  <a href="quofield.html#K8" target="_self">QClass.</a> <font color="Maroon">y</font> holds <br/><font color="Olive">z</font> <a href="hidden.html#R2">in</a>  <a href="quofield.html#K8" target="_self">QClass.</a> <font color="Maroon">x</font>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="19_2"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">z</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="quofield.html#K1" target="_self">Q.</a> <font color="Maroon">I</font>;<br/>

<b>assume </b><a NAME="E1:19_2"/>
<font color="Maroon">z</font> <a href="hidden.html#R2">in</a>  <a href="quofield.html#K8" target="_self">QClass.</a> <font color="Maroon">y</font>
 ;<br/>

<a NAME="E2:19_2"/><b>then </b><i><font color="Green">E57</font></i>: 
<span class="p1">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span>
 
<b>by </b><i><a class="ref" href="quofield.html#D1" target="_self">Def1</a>, , </i>;<br/>
<a NAME="E3:19_2"/><b>then </b><i><font color="Green">E58</font></i>: 
<font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a>  <a href="gcd_1.html#R2">divides</a> <span class="p1">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span>
 
<b>by </b><i><a class="ref" href="gcd_1.html#D1">GCD_1:def 1</a></i>;<br/>
<a NAME="E4:19_2"/><b>then </b><i><font color="Green">E59</font></i>: 
<font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a>  <a href="gcd_1.html#R2">divides</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p2">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span></span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">x</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span>
 
<b>by </b><i><a class="ref" href="gcd_1.html#T7">GCD_1:7</a></i>;<br/>
<a NAME="E5:19_2"/>
<font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a>  <a href="gcd_1.html#R2">divides</a> <font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a> 
 
;<br/>
<a NAME="E6:19_2"/><b>then </b><i><font color="Green">E60</font></i>: 
<font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a>  <a href="gcd_1.html#R2">divides</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p2">(<span class="default"><font color="Maroon">x</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span></span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span>
 
<b>by </b><i><a class="ref" href="gcd_1.html#T7">GCD_1:7</a></i>;<br/>
<a NAME="E7:19_2"/><i><font color="Green">E61</font></i>: 
<font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a>  <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="rlvect_1.html#K1">0.</a> <font color="Maroon">I</font>
 
<b>by </b><i/>;<br/>
<b>then </b><span class="p1">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">x</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> = 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p3">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span></span>)</span> <a href="gcd_1.html#K1">/</a> <span class="p2">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span></span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">x</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span>
<b>by </b><i><a class="txt" href="quofield.html#E1:19"><i><font color="Green">E20</font></i></a>, , <a class="ref" href="gcd_1.html#D4">GCD_1:def 4</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p3">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span></span>)</span> <a href="group_1.html#K10">*</a> <span class="p2">(<span class="default"><font color="Maroon">x</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span></span>)</span> <a href="gcd_1.html#K1">/</a> <span class="p1">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span>
<b>by </b><i>, , <a class="txt" href="quofield.html#E5:19"><i><font color="Green">E24</font></i></a>, <a class="ref" href="gcd_1.html#T11">GCD_1:11</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p3">(<span class="default"><font color="Maroon">x</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span></span>)</span></span>)</span> <a href="gcd_1.html#K1">/</a> <span class="p1">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span>
<b>by </b><i>, <a class="ref" href="group_1.html#D4">GROUP_1:def 4</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p3">(<span class="default"><font color="Maroon">x</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span></span>)</span> <a href="group_1.html#K10">*</a> <span class="p2">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span></span>)</span> <a href="gcd_1.html#K1">/</a> <span class="p1">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span>
<b>by </b><i><a class="ref" href="group_1.html#D4">GROUP_1:def 4</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p2">(<span class="default"><font color="Maroon">x</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span></span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="gcd_1.html#K1">/</a> <span class="p2">(<span class="default"><font color="Maroon">w</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span></span>)</span>
<b>by </b><i><a class="txt" href="quofield.html#E3:19"><i><font color="Green">E23</font></i></a>, <a class="txt" href="quofield.html#E5:19"><i><font color="Green">E24</font></i></a>, <a class="ref" href="gcd_1.html#T11">GCD_1:11</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p2">(<span class="default"><font color="Maroon">x</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span></span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><a href="group_1.html#K2">1.</a> <font color="Maroon">I</font></span>)</span>
<b>by </b><i><a class="txt" href="quofield.html#E5:19"><i><font color="Green">E24</font></i></a>, <a class="ref" href="gcd_1.html#T9">GCD_1:9</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">z</font> <a href="quofield.html#K3" target="_self">`2</a> </span>)</span> <a href="group_1.html#K10">*</a> <span class="p1">(<span class="default"><font color="Maroon">x</font> <a href="quofield.html#K2" target="_self">`1</a> </span>)</span>
<b>by </b><i><a class="ref" href="vectsp_1.html#D13">VECTSP_1:def 13</a></i>
;<br/>
<b>hence </b><a NAME="E9:19_2"/>
<font color="Maroon">z</font> <a href="hidden.html#R2">in</a>  <a href="quofield.html#K8" target="_self">QClass.</a> <font color="Maroon">x</font>
 <b>by </b><i/>;<br/>


</div><b>end;</b></div>
<b>hence </b><a NAME="E14:19"/>
<font color="Maroon">u</font> <a href="hidden.html#R1">=</a> <font color="Maroon">v</font>
 <b>by </b><i>, <a class="ref" href="quofield.html#D1" target="_self">Def1</a>, , <a class="ref" href="subset_1.html#T8">SUBSET_1:8</a></i>;<br/>


</div>
