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<b>let </b><font color="Maroon" title="c1">CPS</font> be  <a href="collsp.html#V4" title="COLLSP:attr.4">proper</a> <a href="collsp.html#NM2" title="COLLSP:NM.2">CollSp</a>;<br/><b>let </b><font color="Maroon" title="c2">p</font>, <font color="Maroon" title="c3">q</font> be   <a href="incsp_1.html#NM1" title="INCSP_1:NM.1">POINT</a> of <span class="p1">(<span class="default"><a href="incproj.html#K3" title="INCPROJ:func.3">IncProjSp_of</a> <font color="Maroon" title="c1">CPS</font></span>)</span>;<br/><b>let </b><font color="Maroon" title="c4">P</font>, <font color="Maroon" title="c5">Q</font> be   <a href="incsp_1.html#NM2" title="INCSP_1:NM.2">LINE</a> of <span class="p1">(<span class="default"><a href="incproj.html#K3" title="INCPROJ:func.3">IncProjSp_of</a> <font color="Maroon" title="c1">CPS</font></span>)</span>;<br/>









<b>assume </b><b>that </b><br/><a NAME="E1:11"/><i><font color="Green" title="E7">A1</font></i>: 
( <font color="Maroon" title="c2">p</font> <a href="incsp_1.html#R1" title="INCSP_1:pred.1">on</a> <font color="Maroon" title="c4">P</font> &amp; <font color="Maroon" title="c3">q</font> <a href="incsp_1.html#R1" title="INCSP_1:pred.1">on</a> <font color="Maroon" title="c4">P</font> &amp; <font color="Maroon" title="c2">p</font> <a href="incsp_1.html#R1" title="INCSP_1:pred.1">on</a> <font color="Maroon" title="c5">Q</font> &amp; <font color="Maroon" title="c3">q</font> <a href="incsp_1.html#R1" title="INCSP_1:pred.1">on</a> <font color="Maroon" title="c5">Q</font> )
 <b>and </b><br/><a NAME="E2:11"/><i><font color="Green" title="E8">A2</font></i>: 
<font color="Maroon" title="c2">p</font> <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a> <font color="Maroon" title="c3">q</font>
 ;<br/>

<b>reconsider </b><font color="Maroon" title="c6">p'</font> = <font color="Maroon" title="c2">p</font>, <font color="Maroon" title="c7">q'</font> = <font color="Maroon" title="c3">q</font> as   <a href="pre_topc.html#NM2" title="PRE_TOPC:NM.2">Point</a> of <font color="Maroon" title="c1">CPS</font> ;<br/>
<b>reconsider </b><font color="Maroon" title="c8">P'</font> = <font color="Maroon" title="c4">P</font>, <font color="Maroon" title="c9">Q'</font> = <font color="Maroon" title="c5">Q</font> as    <a href="incproj.html#M1" title="INCPROJ:mode.1">LINE</a> of <font color="Maroon" title="c1">CPS</font> <b>by </b><i><a class="ref" href="incproj.html#T2" target="_self" title="INCPROJ:th.2">Th2</a></i>;<br/>
<a NAME="E5:11"/>
( <font color="Maroon" title="c6">p'</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c8">P'</font> &amp; <font color="Maroon" title="c7">q'</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c8">P'</font> &amp; <font color="Maroon" title="c6">p'</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c9">Q'</font> &amp; <font color="Maroon" title="c7">q'</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c9">Q'</font> )
 
<b>by </b><i><a class="txt" href="incproj.html#E1:11"><i><font color="Green" title="E7">A1</font></i></a>, <a class="ref" href="incproj.html#T9" target="_self" title="INCPROJ:th.9">Th9</a></i>;<br/>
<b>hence </b><a NAME="E6:11"/>
<font color="Maroon" title="c4">P</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c5">Q</font>
 <b>by </b><i><a class="txt" href="incproj.html#E2:11"><i><font color="Green" title="E8">A2</font></i></a>, <a class="ref" href="collsp.html#T29" title="COLLSP:th.29">COLLSP:29</a></i>;<br/>


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