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<b>let </b><font color="Maroon" title="c1">S</font> be   <a href="analoaf.html#NM1" title="ANALOAF:NM.1">OAffinSpace</a>;<br/><b>let </b><font color="Maroon" title="c2">x</font>, <font color="Maroon" title="c3">y</font>, <font color="Maroon" title="c4">z</font> be   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c1">S</font>;<br/>







<b>assume </b><a NAME="E1:40"/>
<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> 
 ;<br/>

<b>hence </b><a NAME="E2:40"/>
( <font color="Maroon" title="c2">x</font>,<font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c3">y</font> <a href="diraf.html#NR4" title="DIRAF:NR.4">is_collinear</a>  &amp; <font color="Maroon" title="c3">y</font>,<font color="Maroon" title="c2">x</font>,<font color="Maroon" title="c4">z</font> <a href="diraf.html#NR4" title="DIRAF:NR.4">is_collinear</a>  )
 <b>by </b><i><a class="txt" href="diraf.html#E43"><i><font color="Green" title="E25">Lm3</font></i></a></i>;<br/>

<b>hence </b><a NAME="E3:40"/>
( <font color="Maroon" title="c3">y</font>,<font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c2">x</font> <a href="diraf.html#NR4" title="DIRAF:NR.4">is_collinear</a>  &amp; <font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c2">x</font>,<font color="Maroon" title="c3">y</font> <a href="diraf.html#NR4" title="DIRAF:NR.4">is_collinear</a>  )
 <b>by </b><i><a class="txt" href="diraf.html#E43"><i><font color="Green" title="E25">Lm3</font></i></a></i>;<br/>

<b>hence </b><a NAME="E4:40"/>
<font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c3">y</font>,<font color="Maroon" title="c2">x</font> <a href="diraf.html#NR4" title="DIRAF:NR.4">is_collinear</a> 
 <b>by </b><i><a class="txt" href="diraf.html#E43"><i><font color="Green" title="E25">Lm3</font></i></a></i>;<br/>


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