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<b>consider </b><font color="Maroon" title="c2">A</font>, <font color="Maroon" title="c3">B</font> being   <a href="incsp_1.html#NM2" title="INCSP_1:NM.2">LINE</a> of <font color="Maroon" title="c1">IPP</font>;<br/>
<b>consider </b><font color="Maroon" title="c4">a</font> being   <a href="incsp_1.html#NM1" title="INCSP_1:NM.1">POINT</a> of <font color="Maroon" title="c1">IPP</font><b> such that </b><br/><a NAME="E3:3_1_1"/><i><font color="Green" title="E2">A1</font></i>: 
( not <font color="Maroon" title="c4">a</font> <a href="incsp_1.html#R1" title="INCSP_1:pred.1">on</a> <font color="Maroon" title="c2">A</font> &amp; not <font color="Maroon" title="c4">a</font> <a href="incsp_1.html#R1" title="INCSP_1:pred.1">on</a> <font color="Maroon" title="c3">B</font> )
 <b>by </b><i><a class="ref" href="projred1.html#T6" title="PROJRED1:th.6">PROJRED1:6</a></i>;<br/>
<b>take </b>
 <a href="projred1.html#K1" title="PROJRED1:func.1">IncProj</a> <font color="Maroon" title="c2">A</font>,<font color="Maroon" title="c4">a</font>,<font color="Maroon" title="c3">B</font>
;<br/>

<b>thus </b><a NAME="E4:3_1_1"/>
 ex <font color="Olive" title="b1">a</font> being  <a href="incsp_1.html#NM1" title="INCSP_1:NM.1">POINT</a> of <font color="Maroon" title="c1">IPP</font> ex <font color="Olive" title="b2">A</font>, <font color="Olive" title="b3">B</font> being  <a href="incsp_1.html#NM2" title="INCSP_1:NM.2">LINE</a> of <font color="Maroon" title="c1">IPP</font> st <br/>( not <font color="Olive" title="b1">a</font> <a href="incsp_1.html#R1" title="INCSP_1:pred.1">on</a> <font color="Olive" title="b2">A</font> &amp; not <font color="Olive" title="b1">a</font> <a href="incsp_1.html#R1" title="INCSP_1:pred.1">on</a> <font color="Olive" title="b3">B</font> &amp;  <a href="projred1.html#K1" title="PROJRED1:func.1">IncProj</a> <font color="Maroon" title="c2">A</font>,<font color="Maroon" title="c4">a</font>,<font color="Maroon" title="c3">B</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="projred1.html#K1" title="PROJRED1:func.1">IncProj</a> <font color="Olive" title="b2">A</font>,<font color="Olive" title="b1">a</font>,<font color="Olive" title="b3">B</font> )
 <b>by </b><i><a class="txt" href="projred2.html#E3:3_1_1"><i><font color="Green" title="E2">A1</font></i></a></i>;<br/>


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