<?xml version="1.0"?>
<div class="add">

<b>let </b><font color="Maroon">FdSp</font> be   <a href="parsp_2.html#NM1">FanodesSp</a>;<br/><b>let </b><font color="Maroon">p</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">FdSp</font>;<br/><b>let </b><font color="Maroon">q</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">FdSp</font>;<br/>





<b>assume </b><a NAME="E1:28"/>
<font color="Maroon">p</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">q</font>
 ;<br/>

<b>then consider </b><font color="Maroon">r</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">FdSp</font><b> such that </b><br/><a NAME="E3:28"/><i><font color="Green">E17</font></i>: 
not <font color="Maroon">p</font>,<font color="Maroon">q</font> <a href="parsp_1.html#R1">'||'</a> <font color="Maroon">p</font>,<font color="Maroon">r</font>
 <b>by </b><i/>;<br/>
<a NAME="E4:28"/>
not <font color="Maroon">p</font>,<font color="Maroon">q</font>,<font color="Maroon">r</font> <a href="parsp_2.html#R1" target="_self">is_collinear</a> 
 
<b>by </b><i>, </i>;<br/>
<b>hence </b><a NAME="E5:28"/>
not for <font color="Olive">r</font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">FdSp</font> holds  <font color="Maroon">p</font>,<font color="Maroon">q</font>,<font color="Olive">r</font> <a href="parsp_2.html#R1" target="_self">is_collinear</a> 
 ;<br/>


</div>
