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<span class="kw">let </span><font color="Maroon" title="c1">S</font> be   <a href="analoaf.html#NM1" title="ANALOAF:NM.1">OAffinSpace</a>; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide">  for <font color="Olive" title="b1">x</font>, <font color="Olive" title="b2">y</font>, <font color="Olive" title="b3">z</font>, <font color="Olive" title="b4">t</font>, <font color="Olive" title="b5">u</font> being   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c1">S</font>  st <font color="Olive" title="b1">x</font> <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a> <font color="Olive" title="b2">y</font> &amp; <font color="Olive" title="b1">x</font>,<font color="Olive" title="b2">y</font>,<font color="Olive" title="b3">z</font> <a href="diraf.html#NR4" title="DIRAF:NR.4">is_collinear</a>  &amp; <font color="Olive" title="b1">x</font>,<font color="Olive" title="b2">y</font>,<font color="Olive" title="b4">t</font> <a href="diraf.html#NR4" title="DIRAF:NR.4">is_collinear</a>  &amp; <font color="Olive" title="b1">x</font>,<font color="Olive" title="b2">y</font>,<font color="Olive" title="b5">u</font> <a href="diraf.html#NR4" title="DIRAF:NR.4">is_collinear</a>  holds <br/><font color="Olive" title="b3">z</font>,<font color="Olive" title="b4">t</font>,<font color="Olive" title="b5">u</font> <a href="diraf.html#NR4" title="DIRAF:NR.4">is_collinear</a> </span><br/><span class="kw">let </span><font color="Maroon" title="c2">x</font>, <font color="Maroon" title="c3">y</font>, <font color="Maroon" title="c4">z</font>, <font color="Maroon" title="c5">t</font>, <font color="Maroon" title="c6">u</font> be   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c1">S</font>; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> ( <font color="Maroon" title="c2">x</font> <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a> <font color="Maroon" title="c3">y</font> &amp; <font color="Maroon" title="c2">x</font>,<font color="Maroon" title="c3">y</font>,<font color="Maroon" title="c4">z</font> <a href="diraf.html#NR4" title="DIRAF:NR.4">is_collinear</a>  &amp; <font color="Maroon" title="c2">x</font>,<font color="Maroon" title="c3">y</font>,<font color="Maroon" title="c5">t</font> <a href="diraf.html#NR4" title="DIRAF:NR.4">is_collinear</a>  &amp; <font color="Maroon" title="c2">x</font>,<font color="Maroon" title="c3">y</font>,<font color="Maroon" title="c6">u</font> <a href="diraf.html#NR4" title="DIRAF:NR.4">is_collinear</a>  implies <font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c5">t</font>,<font color="Maroon" title="c6">u</font> <a href="diraf.html#NR4" title="DIRAF:NR.4">is_collinear</a>  )</span><br/>











<span class="kw">assume </span><span class="kw">that </span><br/><a NAME="E1:42"/><span class="lab"><font color="Green" title="E29">A1</font></span>: 
<font color="Maroon" title="c2">x</font> <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a> <font color="Maroon" title="c3">y</font>
 <span class="kw">and </span><br/><a NAME="E2:42"/><span class="lab"><font color="Green" title="E30">A2</font></span>: 
<font color="Maroon" title="c2">x</font>,<font color="Maroon" title="c3">y</font>,<font color="Maroon" title="c4">z</font> <a href="diraf.html#NR4" title="DIRAF:NR.4">is_collinear</a> 
 <span class="kw">and </span><br/><a NAME="E3:42"/><span class="lab"><font color="Green" title="E31">A3</font></span>: 
<font color="Maroon" title="c2">x</font>,<font color="Maroon" title="c3">y</font>,<font color="Maroon" title="c5">t</font> <a href="diraf.html#NR4" title="DIRAF:NR.4">is_collinear</a> 
 <span class="kw">and </span><br/><a NAME="E4:42"/><span class="lab"><font color="Green" title="E32">A4</font></span>: 
<font color="Maroon" title="c2">x</font>,<font color="Maroon" title="c3">y</font>,<font color="Maroon" title="c6">u</font> <a href="diraf.html#NR4" title="DIRAF:NR.4">is_collinear</a> 
 ; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> <font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c5">t</font>,<font color="Maroon" title="c6">u</font> <a href="diraf.html#NR4" title="DIRAF:NR.4">is_collinear</a> </span><br/>

<div><span class="lab"><font color="Green" title="E33">A5</font></span>: <a class="txt" onclick="hs2(this)" href="javascript:()" title="42_1"><span class="kw">now </span></a><div class="add"><a NAME="E1:42_1"/><span class="lab"><font color="Green" title="E34">A6</font></span>: 
<font color="Maroon" title="c2">x</font>,<font color="Maroon" title="c3">y</font> <a href="diraf.html#R2" title="DIRAF:pred.2">'||'</a> <font color="Maroon" title="c2">x</font>,<font color="Maroon" title="c4">z</font>
 <span class="kw">by</span> <span class="lab"><a class="txt" href="#E2:42"><span class="lab"><font color="Green" title="E30">A2</font></span></a>, <a class="ref" href="diraf.html#D5" target="_self" title="DIRAF:def.5">Def5</a></span>;<br/><a NAME="E2:42_1"/>
<font color="Maroon" title="c2">x</font>,<font color="Maroon" title="c3">y</font> <a href="diraf.html#R2" title="DIRAF:pred.2">'||'</a> <font color="Maroon" title="c2">x</font>,<font color="Maroon" title="c6">u</font>
 <span class="kw">by</span> <span class="lab"><a class="txt" href="#E4:42"><span class="lab"><font color="Green" title="E32">A4</font></span></a>, <a class="ref" href="diraf.html#D5" target="_self" title="DIRAF:def.5">Def5</a></span>;<br/><a NAME="E3:42_1"/><span class="kw">then </span>
<font color="Maroon" title="c2">x</font>,<font color="Maroon" title="c4">z</font> <a href="diraf.html#R2" title="DIRAF:pred.2">'||'</a> <font color="Maroon" title="c2">x</font>,<font color="Maroon" title="c6">u</font>
 <span class="kw">by</span> <span class="lab"><a class="txt" href="#E1:42"><span class="lab"><font color="Green" title="E29">A1</font></span></a>, <a class="txt" href="#E1:42_1"><span class="lab"><font color="Green" title="E34">A6</font></span></a>, <a class="ref" href="diraf.html#T23" target="_self" title="DIRAF:th.23">Th28</a></span>;<br/><a NAME="E4:42_1"/><span class="kw">then </span><span class="lab"><font color="Green" title="E35">A7</font></span>: 
<font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c2">x</font> <a href="diraf.html#R2" title="DIRAF:pred.2">'||'</a> <font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c6">u</font>
 <span class="kw">by</span> <span class="lab"><a class="ref" href="diraf.html#T21" target="_self" title="DIRAF:th.21">Th26</a></span>;<br/><a NAME="E5:42_1"/>
<font color="Maroon" title="c2">x</font>,<font color="Maroon" title="c3">y</font> <a href="diraf.html#R2" title="DIRAF:pred.2">'||'</a> <font color="Maroon" title="c2">x</font>,<font color="Maroon" title="c5">t</font>
 <span class="kw">by</span> <span class="lab"><a class="txt" href="#E3:42"><span class="lab"><font color="Green" title="E31">A3</font></span></a>, <a class="ref" href="diraf.html#D5" target="_self" title="DIRAF:def.5">Def5</a></span>;<br/><a NAME="E6:42_1"/><span class="kw">then </span>
<font color="Maroon" title="c2">x</font>,<font color="Maroon" title="c4">z</font> <a href="diraf.html#R2" title="DIRAF:pred.2">'||'</a> <font color="Maroon" title="c2">x</font>,<font color="Maroon" title="c5">t</font>
 <span class="kw">by</span> <span class="lab"><a class="txt" href="#E1:42"><span class="lab"><font color="Green" title="E29">A1</font></span></a>, <a class="txt" href="#E1:42_1"><span class="lab"><font color="Green" title="E34">A6</font></span></a>, <a class="ref" href="diraf.html#T23" target="_self" title="DIRAF:th.23">Th28</a></span>;<br/><a NAME="E7:42_1"/><span class="kw">then </span><span class="lab"><font color="Green" title="E36">A8</font></span>: 
<font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c2">x</font> <a href="diraf.html#R2" title="DIRAF:pred.2">'||'</a> <font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c5">t</font>
 <span class="kw">by</span> <span class="lab"><a class="ref" href="diraf.html#T21" target="_self" title="DIRAF:th.21">Th26</a></span>;<br/><span class="kw">assume </span><a NAME="E8:42_1"/>
<font color="Maroon" title="c2">x</font> <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a> <font color="Maroon" title="c4">z</font>
 ; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> <font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c5">t</font>,<font color="Maroon" title="c6">u</font> <a href="diraf.html#NR4" title="DIRAF:NR.4">is_collinear</a> </span><br/><a NAME="E9:42_1"/><span class="kw">then </span>
<font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c5">t</font> <a href="diraf.html#R2" title="DIRAF:pred.2">'||'</a> <font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c6">u</font>
 <span class="kw">by</span> <span class="lab"><a class="txt" href="#E7:42_1"><span class="lab"><font color="Green" title="E36">A8</font></span></a>, <a class="txt" href="#E4:42_1"><span class="lab"><font color="Green" title="E35">A7</font></span></a>, <a class="ref" href="diraf.html#T23" target="_self" title="DIRAF:th.23">Th28</a></span>;<br/><span class="kw">hence </span><a NAME="E10:42_1"/>
<font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c5">t</font>,<font color="Maroon" title="c6">u</font> <a href="diraf.html#NR4" title="DIRAF:NR.4">is_collinear</a> 
 <span class="kw">by</span> <span class="lab"><a class="ref" href="diraf.html#D5" target="_self" title="DIRAF:def.5">Def5</a></span>; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> verum</span><br/></div><span class="kw">end;</span></div>
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="42_2"><span class="kw">now </span></a><div class="add"><span class="kw">assume </span><a NAME="E1:42_2"/><span class="lab"><font color="Green" title="E34">A9</font></span>: 
<font color="Maroon" title="c2">x</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c4">z</font>
 ; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> <font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c5">t</font>,<font color="Maroon" title="c6">u</font> <a href="diraf.html#NR4" title="DIRAF:NR.4">is_collinear</a> </span><br/><a NAME="E2:42_2"/><span class="kw">then </span>
( <font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c3">y</font> <a href="diraf.html#R2" title="DIRAF:pred.2">'||'</a> <font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c5">t</font> &amp; <font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c3">y</font> <a href="diraf.html#R2" title="DIRAF:pred.2">'||'</a> <font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c6">u</font> )
 <span class="kw">by</span> <span class="lab"><a class="txt" href="#E3:42"><span class="lab"><font color="Green" title="E31">A3</font></span></a>, <a class="txt" href="#E4:42"><span class="lab"><font color="Green" title="E32">A4</font></span></a>, <a class="ref" href="diraf.html#D5" target="_self" title="DIRAF:def.5">Def5</a></span>;<br/><a NAME="E3:42_2"/><span class="kw">then </span>
<font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c5">t</font> <a href="diraf.html#R2" title="DIRAF:pred.2">'||'</a> <font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c6">u</font>
 <span class="kw">by</span> <span class="lab"><a class="txt" href="#E1:42"><span class="lab"><font color="Green" title="E29">A1</font></span></a>, <a class="txt" href="#E1:42_2"><span class="lab"><font color="Green" title="E34">A9</font></span></a>, <a class="ref" href="diraf.html#T23" target="_self" title="DIRAF:th.23">Th28</a></span>;<br/><span class="kw">hence </span><a NAME="E4:42_2"/>
<font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c5">t</font>,<font color="Maroon" title="c6">u</font> <a href="diraf.html#NR4" title="DIRAF:NR.4">is_collinear</a> 
 <span class="kw">by</span> <span class="lab"><a class="ref" href="diraf.html#D5" target="_self" title="DIRAF:def.5">Def5</a></span>; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> verum</span><br/></div><span class="kw">end;</span></div>
<span class="kw">hence </span><a NAME="E7:42"/>
<font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c5">t</font>,<font color="Maroon" title="c6">u</font> <a href="diraf.html#NR4" title="DIRAF:NR.4">is_collinear</a> 
 <span class="kw">by</span> <span class="lab"><a class="txt" href="#E5:42"><span class="lab"><font color="Green" title="E33">A5</font></span></a></span>; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> verum</span><br/>


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