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

<b>let </b><font color="Maroon">c<sub>1</sub></font> be  <a href="incproj.html#V6">2-dimensional</a> <a href="incproj.html#V10">Desarguesian</a> <a href="incproj.html#NM2">IncProjSp</a>;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font> be    <a href="projred2.html#M1" target="_self">Projection</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>



<b>consider </b><font color="Maroon">c<sub>3</sub></font> being   <a href="incsp_1.html#NM1">POINT</a> of <font color="Maroon">c<sub>1</sub></font>, <font color="Maroon">c<sub>4</sub></font>, <font color="Maroon">c<sub>5</sub></font> being   <a href="incsp_1.html#NM2">LINE</a> of <font color="Maroon">c<sub>1</sub></font><b> such that </b><br/><a NAME="E2:11"/><i><font color="Green">E9</font></i>: 
( not <font color="Maroon">c<sub>3</sub></font> <a href="incsp_1.html#R1">on</a> <font color="Maroon">c<sub>4</sub></font> &amp; not <font color="Maroon">c<sub>3</sub></font> <a href="incsp_1.html#R1">on</a> <font color="Maroon">c<sub>5</sub></font> &amp; <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="projred1.html#K1">IncProj</a> <font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>5</sub></font> )
 <b>by </b><i><a class="ref" href="projred2.html#D3" target="_self">Def3</a></i>;<br/>
<a NAME="E3:11"/>
<font color="Maroon">c<sub>2</sub></font> <a href="funct_1.html#K2">"</a>  <a href="hidden.html#R1">=</a>  <a href="projred1.html#K1">IncProj</a> <font color="Maroon">c<sub>5</sub></font>,<font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>4</sub></font>
 
<b>by </b><i><a class="txt" href="projred2.html#E2:11"><i><font color="Green">E9</font></i></a>, <a class="ref" href="projred2.html#T9" target="_self">Th9</a></i>;<br/>
<b>hence </b><a NAME="E4:11"/>
<font color="Maroon">c<sub>2</sub></font> <a href="funct_1.html#K2">"</a>  is    <a href="projred2.html#M1" target="_self">Projection</a> of <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="txt" href="projred2.html#E2:11"><i><font color="Green">E9</font></i></a>, <a class="ref" href="projred2.html#D3" target="_self">Def3</a></i>;<br/>


</div>
