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<b>let </b><font color="Maroon">S</font> be   <a href="analoaf.html#NM1">OAffinSpace</a>;<br/><b>let </b><font color="Maroon">x</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">S</font>;<br/><b>let </b><font color="Maroon">y</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">S</font>;<br/><b>let </b><font color="Maroon">z</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">S</font>;<br/>







<b>assume </b><a NAME="E1:40"/>
<font color="Maroon">x</font>,<font color="Maroon">y</font>,<font color="Maroon">z</font> <a href="diraf.html#NR4" target="_self">is_collinear</a> 
 ;<br/>

<b>hence </b><a NAME="E2:40"/>
( <font color="Maroon">x</font>,<font color="Maroon">z</font>,<font color="Maroon">y</font> <a href="diraf.html#NR4" target="_self">is_collinear</a>  &amp; <font color="Maroon">y</font>,<font color="Maroon">x</font>,<font color="Maroon">z</font> <a href="diraf.html#NR4" target="_self">is_collinear</a>  )
 <b>by </b><i/>;<br/>

<b>hence </b><a NAME="E3:40"/>
( <font color="Maroon">y</font>,<font color="Maroon">z</font>,<font color="Maroon">x</font> <a href="diraf.html#NR4" target="_self">is_collinear</a>  &amp; <font color="Maroon">z</font>,<font color="Maroon">x</font>,<font color="Maroon">y</font> <a href="diraf.html#NR4" target="_self">is_collinear</a>  )
 <b>by </b><i/>;<br/>

<b>hence </b><a NAME="E4:40"/>
<font color="Maroon">z</font>,<font color="Maroon">y</font>,<font color="Maroon">x</font> <a href="diraf.html#NR4" target="_self">is_collinear</a> 
 <b>by </b><i/>;<br/>


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