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<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">A</font> be   <a href="incsp_1.html#NM2">LINE</a> of <font color="Maroon">IPP</font>;<br/>



<b>consider </b><font color="Maroon">o</font> being   <a href="incsp_1.html#NM1">POINT</a> of <font color="Maroon">IPP</font><b> such that </b><br/><a NAME="E2:13"/><i><font color="Green">E47</font></i>: 
not <font color="Maroon">o</font> <a href="incsp_1.html#R1">on</a> <font color="Maroon">A</font>
 <b>by </b><i><a class="ref" href="projred1.html#T1">PROJRED1:1</a></i>;<br/>
<a NAME="E3:13"/>
 <a href="relat_1.html#K6">id</a> <span class="p1">(<span class="default"><a href="projred2.html#K1" target="_self">CHAIN</a> <font color="Maroon">A</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="projred1.html#K1">IncProj</a> <font color="Maroon">A</font>,<font color="Maroon">o</font>,<font color="Maroon">A</font>
 
<b>by </b><i>, </i>;<br/>
<b>hence </b><a NAME="E4:13"/>
 <a href="relat_1.html#K6">id</a> <span class="p1">(<span class="default"><a href="projred2.html#K1" target="_self">CHAIN</a> <font color="Maroon">A</font></span>)</span> is    <a href="projred2.html#M1" target="_self">Projection</a> of <font color="Maroon">IPP</font>
 <b>by </b><i>, </i>;<br/>


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