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

<b>let </b><font color="Maroon">IPP</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">p</font> be   <a href="incsp_1.html#NM1">POINT</a> of <font color="Maroon">IPP</font>;<br/><b>let </b><font color="Maroon">x</font> be   <a href="incsp_1.html#NM1">POINT</a> of <font color="Maroon">IPP</font>;<br/><b>let </b><font color="Maroon">K</font> be   <a href="incsp_1.html#NM2">LINE</a> of <font color="Maroon">IPP</font>;<br/><b>let </b><font color="Maroon">L</font> be   <a href="incsp_1.html#NM2">LINE</a> of <font color="Maroon">IPP</font>;<br/>









<b>assume </b><a NAME="E1:22"/>
( not <font color="Maroon">p</font> <a href="incsp_1.html#R1">on</a> <font color="Maroon">K</font> &amp; not <font color="Maroon">p</font> <a href="incsp_1.html#R1">on</a> <font color="Maroon">L</font> &amp; <font color="Maroon">x</font> <a href="incsp_1.html#R1">on</a> <font color="Maroon">K</font> )
 ;<br/>

<a NAME="E2:22"/><b>then </b>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a>  <a href="relset_1.html#K4">dom</a> <span class="p1">(<span class="default"><a href="projred1.html#K1" target="_self">IncProj</a> <font color="Maroon">K</font>,<font color="Maroon">p</font>,<font color="Maroon">L</font></span>)</span>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:22"/>
<span class="p1">(<span class="default"><a href="projred1.html#K1" target="_self">IncProj</a> <font color="Maroon">K</font>,<font color="Maroon">p</font>,<font color="Maroon">L</font></span>)</span> <a href="funct_1.html#K1">.</a> <font color="Maroon">x</font> is   <a href="incsp_1.html#NM1">POINT</a> of <font color="Maroon">IPP</font>
 <b>by </b><i><a class="ref" href="partfun1.html#T27">PARTFUN1:27</a></i>;<br/>


</div>
