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<b>let </b><font color="Maroon">S</font> be   <a href="incsp_1.html#NM4">IncSpace</a>;<br/><b>let </b><font color="Maroon">L</font> be   <a href="incsp_1.html#NM2">LINE</a> of <font color="Maroon">S</font>;<br/><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">F</font> be   <a href="subset_1.html#NM2">Subset</a> of the <a href="incsp_1.html#U1" target="_self">Points</a> of <font color="Maroon">S</font>;<br/>







<b>assume </b><b>that </b><br/><a NAME="E1:30"/><i><font color="Green">E23</font></i>: 
<font color="Maroon">F</font> <a href="incsp_1.html#R4" target="_self">on</a> <font color="Maroon">L</font>
 <b>and </b><br/><a NAME="E2:30"/><i><font color="Green">E24</font></i>: 
<font color="Maroon">L</font> <a href="incsp_1.html#R3" target="_self">on</a> <font color="Maroon">P</font>
 ;<br/>

<b>let </b><font color="Maroon">A</font> be   <a href="incsp_1.html#NM1">POINT</a> of <font color="Maroon">S</font>; <i><font color="Red">:: according to </font></i><a class="ref" href="incsp_1.html#D5" target="_self">INCSP_1:def 5</a><br/>

<b>assume </b><a NAME="E3:30"/>
<font color="Maroon">A</font> <a href="hidden.html#R2">in</a> <font color="Maroon">F</font>
 ;<br/>

<a NAME="E4:30"/><b>then </b>
<font color="Maroon">A</font> <a href="incsp_1.html#R1" target="_self">on</a> <font color="Maroon">L</font>
 
<b>by </b><i><a class="ref" href="incsp_1.html#D7" target="_self">Def7</a>, </i>;<br/>
<b>hence </b><a NAME="E5:30"/>
<font color="Maroon">A</font> <a href="incsp_1.html#R2" target="_self">on</a> <font color="Maroon">P</font>
 <b>by </b><i><a class="ref" href="incsp_1.html#T11" target="_self">Th11</a>, <a class="ref" href="incsp_1.html#D5" target="_self">Def5</a></i>;<br/>


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