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

<b>set </b><font color="Maroon">qf</font> =  <a href="bilinear.html#K17" target="_self">LQForm</a> <font color="Maroon">f</font>;<br/>
<b>set </b><font color="Maroon">L</font> =  <a href="bilinear.html#K15" target="_self">LKer</a> <font color="Maroon">f</font>;<br/>
<b>set </b><font color="Maroon">qV</font> =  <a href="vectsp10.html#K6">VectQuot</a> <font color="Maroon">V</font>,<span class="p1">(<span class="default"><a href="bilinear.html#K15" target="_self">LKer</a> <font color="Maroon">f</font></span>)</span>;<br/>
<b>thus </b><a NAME="E1:124_1_1"/>
 <a href="bilinear.html#K12" target="_self">leftker</a> <span class="p1">(<span class="default"><a href="bilinear.html#K17" target="_self">LQForm</a> <font color="Maroon">f</font></span>)</span> <a href="tarski.html#R1">c=</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><span class="p2">(<span class="default"><a href="rlvect_1.html#K1">0.</a> <span class="p3">(<span class="default"><a href="vectsp10.html#K6">VectQuot</a> <font color="Maroon">V</font>,<span class="p4">(<span class="default"><a href="bilinear.html#K15" target="_self">LKer</a> <font color="Maroon">f</font></span>)</span></span>)</span></span>)</span></span><a href="domain_1.html#K6">}</a></span>
  <i><font color="Red">:: according to </font></i><a class="ref" href="xboole_0.html#D10">XBOOLE_0:def 10</a>,<a class="ref" href="bilinear.html#D24" target="_self">BILINEAR:def 24</a><div><a class="txt" onclick="hs2(this)" href="javascript:()" title="124_1_1_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">x</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a><br/>

<b>assume </b><a NAME="E1:124_1_1_1"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a>  <a href="bilinear.html#K12" target="_self">leftker</a> <span class="p1">(<span class="default"><a href="bilinear.html#K17" target="_self">LQForm</a> <font color="Maroon">f</font></span>)</span>
 ;<br/>

<b>then consider </b><font color="Maroon">vv</font> being   <a href="vectsp_1.html#NM5">Vector</a> of <span class="p1">(<span class="default"><a href="vectsp10.html#K6">VectQuot</a> <font color="Maroon">V</font>,<span class="p2">(<span class="default"><a href="bilinear.html#K15" target="_self">LKer</a> <font color="Maroon">f</font></span>)</span></span>)</span><b> such that </b><br/><a NAME="E3:124_1_1_1"/><i><font color="Green">E33</font></i>: 
( <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">vv</font> &amp; ( for <font color="Olive">w</font> being  <a href="vectsp_1.html#NM5">Vector</a> of <font color="Maroon">W</font> holds  <span class="p1">(<span class="default"><a href="bilinear.html#K17" target="_self">LQForm</a> <font color="Maroon">f</font></span>)</span> <a href="binop_1.html#K2">.</a> <font color="Maroon">vv</font>,<font color="Olive">w</font> <a href="hidden.html#R1">=</a>  <a href="rlvect_1.html#K1">0.</a> <font color="Maroon">K</font> ) )
 ;<br/>
<b>consider </b><font color="Maroon">v</font> being   <a href="vectsp_1.html#NM5">Vector</a> of <font color="Maroon">V</font><b> such that </b><br/><a NAME="E5:124_1_1_1"/><i><font color="Green">E37</font></i>: 
<font color="Maroon">vv</font> <a href="hidden.html#R1">=</a> <font color="Maroon">v</font> <a href="vectsp_4.html#K3">+</a> <span class="p1">(<span class="default"><a href="bilinear.html#K15" target="_self">LKer</a> <font color="Maroon">f</font></span>)</span>
 <b>by </b><i><a class="ref" href="vectsp10.html#T23">VECTSP10:23</a></i>;<br/>
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="124_1_1_1_1"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">w</font> be   <a href="vectsp_1.html#NM5">Vector</a> of <font color="Maroon">W</font>;<br/><b>thus </b><font color="Maroon">f</font> <a href="binop_1.html#K2">.</a> <font color="Maroon">v</font>,<font color="Maroon">w</font> = 
<span class="p1">(<span class="default"><a href="bilinear.html#K17" target="_self">LQForm</a> <font color="Maroon">f</font></span>)</span> <a href="binop_1.html#K2">.</a> <font color="Maroon">vv</font>,<font color="Maroon">w</font>
<b>by </b><i>, <a class="txt" href="bilinear.html#E9"><i><font color="Green">Lemma44</font></i></a></i>
<br/>.= 
 <a href="rlvect_1.html#K1">0.</a> <font color="Maroon">K</font>
<b>by </b><i><a class="ref" href="bilinear.html#D11" target="_self">Def11</a></i>
;<br/></div><b>end;</b></div>
<a NAME="E7:124_1_1_1"/><b>then </b>
<font color="Maroon">v</font> <a href="hidden.html#R2">in</a>  <a href="bilinear.html#K12" target="_self">leftker</a> <font color="Maroon">f</font>
 
;<br/>
<a NAME="E8:124_1_1_1"/><b>then </b>
<font color="Maroon">v</font> <a href="hidden.html#R2">in</a> the <a href="struct_0.html#U1">carrier</a> of <span class="p1">(<span class="default"><a href="bilinear.html#K15" target="_self">LKer</a> <font color="Maroon">f</font></span>)</span>
 
<b>by </b><i><a class="ref" href="bilinear.html#D8" target="_self">Def8</a></i>;<br/>
<a NAME="E9:124_1_1_1"/><b>then </b>
<font color="Maroon">v</font> <a href="rlvect_1.html#R1">in</a>  <a href="bilinear.html#K15" target="_self">LKer</a> <font color="Maroon">f</font>
 
<b>by </b><i><a class="ref" href="rlvect_1.html#D1">RLVECT_1:def 1</a></i>;<br/>
<b>then </b><font color="Maroon">v</font> <a href="vectsp_4.html#K3">+</a> <span class="p1">(<span class="default"><a href="bilinear.html#K15" target="_self">LKer</a> <font color="Maroon">f</font></span>)</span> = 
the <a href="struct_0.html#U1">carrier</a> of <span class="p1">(<span class="default"><a href="bilinear.html#K15" target="_self">LKer</a> <font color="Maroon">f</font></span>)</span>
<b>by </b><i><a class="ref" href="vectsp_4.html#T64">VECTSP_4:64</a></i>
<br/>.= 
 <a href="vectsp10.html#K4">zeroCoset</a> <font color="Maroon">V</font>,<span class="p1">(<span class="default"><a href="bilinear.html#K15" target="_self">LKer</a> <font color="Maroon">f</font></span>)</span>
<b>by </b><i><a class="ref" href="vectsp10.html#D4">VECTSP10:def 4</a></i>
<br/>.= 
 <a href="rlvect_1.html#K1">0.</a> <span class="p1">(<span class="default"><a href="vectsp10.html#K6">VectQuot</a> <font color="Maroon">V</font>,<span class="p2">(<span class="default"><a href="bilinear.html#K15" target="_self">LKer</a> <font color="Maroon">f</font></span>)</span></span>)</span>
<b>by </b><i><a class="ref" href="vectsp10.html#T22">VECTSP10:22</a></i>
;<br/>
<b>hence </b><a NAME="E11:124_1_1_1"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><span class="p2">(<span class="default"><a href="rlvect_1.html#K1">0.</a> <span class="p3">(<span class="default"><a href="vectsp10.html#K6">VectQuot</a> <font color="Maroon">V</font>,<span class="p4">(<span class="default"><a href="bilinear.html#K15" target="_self">LKer</a> <font color="Maroon">f</font></span>)</span></span>)</span></span>)</span></span><a href="domain_1.html#K6">}</a></span>
 <b>by </b><i><a class="ref" href="bilinear.html#D11" target="_self">Def11</a>, , <a class="ref" href="tarski.html#D1">TARSKI:def 1</a></i>;<br/>


</div><b>end;</b></div>

<b>let </b><font color="Maroon">x</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a><br/>

<b>assume </b><a NAME="E2:124_1_1"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><span class="p2">(<span class="default"><a href="rlvect_1.html#K1">0.</a> <span class="p3">(<span class="default"><a href="vectsp10.html#K6">VectQuot</a> <font color="Maroon">V</font>,<span class="p4">(<span class="default"><a href="bilinear.html#K15" target="_self">LKer</a> <font color="Maroon">f</font></span>)</span></span>)</span></span>)</span></span><a href="domain_1.html#K6">}</a></span>
 ;<br/>

<a NAME="E3:124_1_1"/><b>then </b><i><font color="Green">E38</font></i>: 
<font color="Maroon">x</font> <a href="hidden.html#R1">=</a>  <a href="rlvect_1.html#K1">0.</a> <span class="p1">(<span class="default"><a href="vectsp10.html#K6">VectQuot</a> <font color="Maroon">V</font>,<span class="p2">(<span class="default"><a href="bilinear.html#K15" target="_self">LKer</a> <font color="Maroon">f</font></span>)</span></span>)</span>
 
<b>by </b><i><a class="ref" href="tarski.html#D1">TARSKI:def 1</a></i>;<br/>
<a NAME="E4:124_1_1"/>
for <font color="Olive">w</font> being  <a href="vectsp_1.html#NM5">Vector</a> of <font color="Maroon">W</font> holds  <span class="p1">(<span class="default"><a href="bilinear.html#K17" target="_self">LQForm</a> <font color="Maroon">f</font></span>)</span> <a href="binop_1.html#K2">.</a> <span class="p1">(<span class="default"><a href="rlvect_1.html#K1">0.</a> <span class="p2">(<span class="default"><a href="vectsp10.html#K6">VectQuot</a> <font color="Maroon">V</font>,<span class="p3">(<span class="default"><a href="bilinear.html#K15" target="_self">LKer</a> <font color="Maroon">f</font></span>)</span></span>)</span></span>)</span>,<font color="Olive">w</font> <a href="hidden.html#R1">=</a>  <a href="rlvect_1.html#K1">0.</a> <font color="Maroon">K</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E5:124_1_1"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a>  <a href="bilinear.html#K12" target="_self">leftker</a> <span class="p1">(<span class="default"><a href="bilinear.html#K17" target="_self">LQForm</a> <font color="Maroon">f</font></span>)</span>
 <b>by </b><i><a class="ref" href="bilinear.html#D11" target="_self">Def11</a></i>;<br/>


</div>
