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<b>let </b><font color="Maroon" title="c4">P</font>, <font color="Maroon" title="c5">Q</font> be   <a href="incsp_1.html#NM3" title="INCSP_1:NM.3">PLANE</a> of <font color="Maroon" title="c1">S</font>;<br/>



<b>assume </b><a NAME="E1:49_1_1"/><i><font color="Green" title="E36">A3</font></i>: 
( <font color="Maroon" title="c2">K</font> <a href="incsp_1.html#R3" title="INCSP_1:pred.3">on</a> <font color="Maroon" title="c4">P</font> &amp; <font color="Maroon" title="c3">L</font> <a href="incsp_1.html#R3" title="INCSP_1:pred.3">on</a> <font color="Maroon" title="c4">P</font> &amp; <font color="Maroon" title="c2">K</font> <a href="incsp_1.html#R3" title="INCSP_1:pred.3">on</a> <font color="Maroon" title="c5">Q</font> &amp; <font color="Maroon" title="c3">L</font> <a href="incsp_1.html#R3" title="INCSP_1:pred.3">on</a> <font color="Maroon" title="c5">Q</font> )
 ;<br/>

<b>consider </b><font color="Maroon" title="c6">P1</font> being   <a href="incsp_1.html#NM3" title="INCSP_1:NM.3">PLANE</a> of <font color="Maroon" title="c1">S</font><b> such that </b><br/><a NAME="E3:49_1_1"/><i><font color="Green" title="E37">A4</font></i>: 
for <font color="Olive" title="b1">P2</font> being  <a href="incsp_1.html#NM3" title="INCSP_1:NM.3">PLANE</a> of <font color="Maroon" title="c1">S</font> holds <br/> ( ( <font color="Maroon" title="c2">K</font> <a href="incsp_1.html#R3" title="INCSP_1:pred.3">on</a> <font color="Olive" title="b1">P2</font> &amp; <font color="Maroon" title="c3">L</font> <a href="incsp_1.html#R3" title="INCSP_1:pred.3">on</a> <font color="Olive" title="b1">P2</font> ) iff <font color="Maroon" title="c6">P1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b1">P2</font> )
 <b>by </b><i><a class="txt" href="incsp_1.html#E1:49"><i><font color="Green" title="E34">A1</font></i></a>, <a class="txt" href="incsp_1.html#E2:49"><i><font color="Green" title="E35">A2</font></i></a>, <a class="ref" href="incsp_1.html#T49" target="_self" title="INCSP_1:th.49">Th49</a></i>;<br/>
<a NAME="E4:49_1_1"/>
( <font color="Maroon" title="c4">P</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c6">P1</font> &amp; <font color="Maroon" title="c5">Q</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c6">P1</font> )
 
<b>by </b><i><a class="txt" href="incsp_1.html#E1:49_1_1"><i><font color="Green" title="E36">A3</font></i></a>, <a class="txt" href="incsp_1.html#E3:49_1_1"><i><font color="Green" title="E37">A4</font></i></a></i>;<br/>
<b>hence </b><a NAME="E5:49_1_1"/>
<font color="Maroon" title="c4">P</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c5">Q</font>
 ;<br/>


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