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<b>let </b><font color="Maroon" title="c1">G</font> be    <a href="incsp_1.html#L1" title="INCSP_1:struct.1">IncProjStr</a> ;<br/><b>let </b><font color="Maroon" title="c2">a</font> be   <a href="incsp_1.html#NM1" title="INCSP_1:NM.1">POINT</a> of <font color="Maroon" title="c1">G</font>;<br/><b>let </b><font color="Maroon" title="c3">A</font> be   <a href="incsp_1.html#NM2" title="INCSP_1:NM.2">LINE</a> of <font color="Maroon" title="c1">G</font>;<br/>





<b>assume </b><a NAME="E1:16"/><i><font color="Green" title="E14">A1</font></i>: 
( <font color="Maroon" title="c1">G</font> is   <a href="incproj.html#NM2" title="INCPROJ:NM.2">IncProjSp</a> &amp; <font color="Maroon" title="c2">a</font> <a href="incsp_1.html#R1" title="INCSP_1:pred.1">on</a> <font color="Maroon" title="c3">A</font> )
 ;<br/>

<b>then consider </b><font color="Maroon" title="c4">b</font> being   <a href="incsp_1.html#NM1" title="INCSP_1:NM.1">POINT</a> of <font color="Maroon" title="c1">G</font><b> such that </b><br/><a NAME="E3:16"/><i><font color="Green" title="E15">A2</font></i>: 
( <font color="Maroon" title="c4">b</font> <a href="incsp_1.html#R1" title="INCSP_1:pred.1">on</a> <font color="Maroon" title="c3">A</font> &amp; <font color="Maroon" title="c4">b</font> <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a> <font color="Maroon" title="c2">a</font> &amp; <font color="Maroon" title="c4">b</font> <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a> <font color="Maroon" title="c2">a</font> )
 <b>by </b><i><a class="ref" href="projred1.html#T8" title="PROJRED1:th.8">PROJRED1:8</a></i>;<br/>
<b>consider </b><font color="Maroon" title="c5">c</font> being   <a href="incsp_1.html#NM1" title="INCSP_1:NM.1">POINT</a> of <font color="Maroon" title="c1">G</font><b> such that </b><br/><a NAME="E5:16"/><i><font color="Green" title="E16">A3</font></i>: 
( <font color="Maroon" title="c5">c</font> <a href="incsp_1.html#R1" title="INCSP_1:pred.1">on</a> <font color="Maroon" title="c3">A</font> &amp; <font color="Maroon" title="c5">c</font> <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a> <font color="Maroon" title="c2">a</font> &amp; <font color="Maroon" title="c5">c</font> <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a> <font color="Maroon" title="c4">b</font> )
 <b>by </b><i><a class="txt" href="projpl_1.html#E1:16"><i><font color="Green" title="E14">A1</font></i></a>, <a class="ref" href="projred1.html#T8" title="PROJRED1:th.8">PROJRED1:8</a></i>;<br/>
<b>take </b>
<font color="Maroon" title="c4">b</font>
;<br/>

<b>take </b>
<font color="Maroon" title="c5">c</font>
;<br/>

<b>thus </b><a NAME="E6:16"/>
( <font color="Maroon" title="c4">b</font>,<font color="Maroon" title="c5">c</font> <a href="incproj.html#R3" title="INCPROJ:pred.3">on</a> <font color="Maroon" title="c3">A</font> &amp; <font color="Maroon" title="c2">a</font>,<font color="Maroon" title="c4">b</font>,<font color="Maroon" title="c5">c</font> <a href="incproj.html#R1" title="INCPROJ:pred.1">are_mutually_different</a>  )
 <b>by </b><i><a class="txt" href="projpl_1.html#E3:16"><i><font color="Green" title="E15">A2</font></i></a>, <a class="txt" href="projpl_1.html#E5:16"><i><font color="Green" title="E16">A3</font></i></a>, <a class="ref" href="incproj.html#D5" title="INCPROJ:def.5">INCPROJ:def 5</a>, <a class="ref" href="incproj.html#D7" title="INCPROJ:def.7">INCPROJ:def 7</a></i>;<br/>


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