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<b>let </b><font color="Maroon" title="c1">V</font> be  non <a href="realset2.html#V3" title="REALSET2:attr.3">trivial</a> <a href="rlvect_1.html#NM2" title="RLVECT_1:NM.2">RealLinearSpace</a>;<br/>

<b>given </b><font color="Maroon" title="c2">u</font>, <font color="Maroon" title="c3">v</font>, <font color="Maroon" title="c4">w</font> being   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c1">V</font><b> such that </b><a NAME="E1:74"/><i><font color="Green" title="E69">A1</font></i>: 
for <font color="Olive" title="b1">a</font>, <font color="Olive" title="b2">b</font>, <font color="Olive" title="b3">c</font> being  <a href="real_1.html#NM1" title="REAL_1:NM.1">Real</a>  st <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Olive" title="b1">a</font> <a href="rlvect_1.html#K3" title="RLVECT_1:func.3">*</a> <font color="Maroon" title="c2">u</font></span>)</span> <a href="rlvect_1.html#K4" title="RLVECT_1:func.4">+</a> <span class="p2">(<span class="default"><font color="Olive" title="b2">b</font> <a href="rlvect_1.html#K3" title="RLVECT_1:func.3">*</a> <font color="Maroon" title="c3">v</font></span>)</span></span>)</span> <a href="rlvect_1.html#K4" title="RLVECT_1:func.4">+</a> <span class="p1">(<span class="default"><font color="Olive" title="b3">c</font> <a href="rlvect_1.html#K3" title="RLVECT_1:func.3">*</a> <font color="Maroon" title="c4">w</font></span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="rlvect_1.html#K1" title="RLVECT_1:func.1">0.</a> <font color="Maroon" title="c1">V</font> holds <br/>( <font color="Olive" title="b1">a</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> 0 &amp; <font color="Olive" title="b2">b</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> 0 &amp; <font color="Olive" title="b3">c</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> 0 )
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="anproj_2.html#D6" target="_self" title="ANPROJ_2:def.6">ANPROJ_2:def 6</a><br/>

<a NAME="E2:74"/><i><font color="Green" title="E70">A2</font></i>: 
( <font color="Maroon" title="c2">u</font> <a href="anproj_1.html#NR1" title="ANPROJ_1:NR.1">is_Prop_Vect</a>  &amp; <font color="Maroon" title="c3">v</font> <a href="anproj_1.html#NR1" title="ANPROJ_1:NR.1">is_Prop_Vect</a>  &amp; <font color="Maroon" title="c4">w</font> <a href="anproj_1.html#NR1" title="ANPROJ_1:NR.1">is_Prop_Vect</a>  )
 
<b>by </b><i><a class="txt" href="anproj_2.html#E1:74"><i><font color="Green" title="E69">A1</font></i></a>, <a class="ref" href="anproj_2.html#T1" target="_self" title="ANPROJ_2:th.1">Th1</a></i>;<br/>
<a NAME="E3:74"/><i><font color="Green" title="E71">A3</font></i>: 
not <font color="Maroon" title="c2">u</font>,<font color="Maroon" title="c3">v</font>,<font color="Maroon" title="c4">w</font> <a href="anproj_1.html#R2" title="ANPROJ_1:pred.2">are_LinDep</a> 
 
<b>by </b><i><a class="txt" href="anproj_2.html#E1:74"><i><font color="Green" title="E69">A1</font></i></a>, <a class="ref" href="anproj_2.html#T1" target="_self" title="ANPROJ_2:th.1">Th1</a></i>;<br/>
<b>reconsider </b><font color="Maroon" title="c5">p</font> =  <a href="anproj_1.html#K3" title="ANPROJ_1:func.3">Dir</a> <font color="Maroon" title="c2">u</font>, <font color="Maroon" title="c6">q</font> =  <a href="anproj_1.html#K3" title="ANPROJ_1:func.3">Dir</a> <font color="Maroon" title="c3">v</font>, <font color="Maroon" title="c7">r</font> =  <a href="anproj_1.html#K3" title="ANPROJ_1:func.3">Dir</a> <font color="Maroon" title="c4">w</font> as   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <span class="p1">(<span class="default"><a href="anproj_1.html#K6" title="ANPROJ_1:func.6">ProjectiveSpace</a> <font color="Maroon" title="c1">V</font></span>)</span> <b>by </b><i><a class="txt" href="anproj_2.html#E2:74"><i><font color="Green" title="E70">A2</font></i></a>, <a class="ref" href="anproj_1.html#T42" title="ANPROJ_1:th.42">ANPROJ_1:42</a></i>;<br/>
<b>take </b>
<font color="Maroon" title="c5">p</font>
; <i><font color="Red">:: according to </font></i><a class="ref" href="collsp.html#D6" title="COLLSP:def.6">COLLSP:def 6</a><br/>

<b>take </b>
<font color="Maroon" title="c6">q</font>
;<br/>

<b>take </b>
<font color="Maroon" title="c7">r</font>
;<br/>

<b>assume </b><a NAME="E5:74"/>
<font color="Maroon" title="c5">p</font>,<font color="Maroon" title="c6">q</font>,<font color="Maroon" title="c7">r</font> <a href="collsp.html#R1" title="COLLSP:pred.1">is_collinear</a> 
 ;<br/>

<a NAME="E6:74"/><b>then </b>
<span class="p1"><a href="domain_1.html#K4" title="DOMAIN_1:func.4">[</a><span class="default"><span class="p2">(<span class="default"><a href="anproj_1.html#K3" title="ANPROJ_1:func.3">Dir</a> <font color="Maroon" title="c2">u</font></span>)</span>,<span class="p2">(<span class="default"><a href="anproj_1.html#K3" title="ANPROJ_1:func.3">Dir</a> <font color="Maroon" title="c3">v</font></span>)</span>,<span class="p2">(<span class="default"><a href="anproj_1.html#K3" title="ANPROJ_1:func.3">Dir</a> <font color="Maroon" title="c4">w</font></span>)</span></span><a href="domain_1.html#K4" title="DOMAIN_1:func.4">]</a></span> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> the <a href="collsp.html#U1" title="COLLSP:sel.1">Collinearity</a> of <span class="p1">(<span class="default"><a href="anproj_1.html#K6" title="ANPROJ_1:func.6">ProjectiveSpace</a> <font color="Maroon" title="c1">V</font></span>)</span>
 
<b>by </b><i><a class="ref" href="collsp.html#D2" title="COLLSP:def.2">COLLSP:def 2</a></i>;<br/>
<b>hence </b><a NAME="E7:74"/>
contradiction
 <b>by </b><i><a class="txt" href="anproj_2.html#E2:74"><i><font color="Green" title="E70">A2</font></i></a>, <a class="txt" href="anproj_2.html#E3:74"><i><font color="Green" title="E71">A3</font></i></a>, <a class="ref" href="anproj_1.html#T41" title="ANPROJ_1:th.41">ANPROJ_1:41</a></i>;<br/>


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