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<b>let </b><font color="Maroon">P</font> be   <a href="incsp_1.html#NM3">PLANE</a> of <font color="Maroon">S</font>;<br/><b>let </b><font color="Maroon">Q</font> be   <a href="incsp_1.html#NM3">PLANE</a> of <font color="Maroon">S</font>;<br/>



<b>assume </b><a NAME="E1:48_1_1"/><i><font color="Green">E24</font></i>: 
( <font color="Maroon">A</font> <a href="incsp_1.html#R2" target="_self">on</a> <font color="Maroon">P</font> &amp; <font color="Maroon">L</font> <a href="incsp_1.html#R3" target="_self">on</a> <font color="Maroon">P</font> &amp; <font color="Maroon">A</font> <a href="incsp_1.html#R2" target="_self">on</a> <font color="Maroon">Q</font> &amp; <font color="Maroon">L</font> <a href="incsp_1.html#R3" target="_self">on</a> <font color="Maroon">Q</font> )
 ;<br/>

<b>consider </b><font color="Maroon">P1</font> being   <a href="incsp_1.html#NM3">PLANE</a> of <font color="Maroon">S</font><b> such that </b><br/><a NAME="E3:48_1_1"/><i><font color="Green">E36</font></i>: 
for <font color="Olive">P2</font> being  <a href="incsp_1.html#NM3">PLANE</a> of <font color="Maroon">S</font> holds <br/> ( ( <font color="Maroon">A</font> <a href="incsp_1.html#R2" target="_self">on</a> <font color="Olive">P2</font> &amp; <font color="Maroon">L</font> <a href="incsp_1.html#R3" target="_self">on</a> <font color="Olive">P2</font> ) iff <font color="Maroon">P1</font> <a href="hidden.html#R1">=</a> <font color="Olive">P2</font> )
 <b>by </b><i><a class="ref" href="incsp_1.html#T19" target="_self">Th19</a>, </i>;<br/>
<a NAME="E4:48_1_1"/>
( <font color="Maroon">P1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">P</font> &amp; <font color="Maroon">P1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">Q</font> )
 
<b>by </b><i><a class="ref" href="incsp_1.html#T20" target="_self">Th20</a>, <a class="ref" href="incsp_1.html#T21" target="_self">Th21</a></i>;<br/>
<b>hence </b><a NAME="E5:48_1_1"/>
<font color="Maroon">P</font> <a href="hidden.html#R1">=</a> <font color="Maroon">Q</font>
 ;<br/>


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