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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>consider </b><font color="Maroon" title="c2">x</font>, <font color="Maroon" title="c3">y</font>, <font color="Maroon" title="c4">z</font> being   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c1">S</font><b> such that </b><br/><a NAME="E2:46"/><i><font color="Green" title="E30">A1</font></i>: 
not <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>
 <b>by </b><i><a class="ref" href="diraf.html#T29" target="_self" title="DIRAF:th.29">Th29</a></i>;<br/>
<a NAME="E3:46"/>
not <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> 
 
<b>by </b><i><a class="txt" href="diraf.html#E2:46"><i><font color="Green" title="E30">A1</font></i></a>, <a class="ref" href="diraf.html#D5" target="_self" title="DIRAF:def.5">Def5</a></i>;<br/>
<b>hence </b><a NAME="E4:46"/>
not for <font color="Olive" title="b1">x</font>, <font color="Olive" title="b2">y</font>, <font color="Olive" title="b3">z</font> being  <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c1">S</font> holds  <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> 
 ;<br/>


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