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<b>let </b><font color="Maroon" title="c1">S</font> be    <a href="incsp_1.html#L2" title="INCSP_1:struct.2">IncStruct</a> ;<br/><b>let </b><font color="Maroon" title="c2">G</font>, <font color="Maroon" title="c3">F</font> be   <a href="subset_1.html#NM2" title="SUBSET_1:NM.2">Subset</a> of the <a href="incsp_1.html#U1" title="INCSP_1:sel.1">Points</a> of <font color="Maroon" title="c1">S</font>;<br/>





<b>assume </b><b>that </b><br/><a NAME="E1:26"/><i><font color="Green" title="E19">A1</font></i>: 
<font color="Maroon" title="c2">G</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a> <font color="Maroon" title="c3">F</font>
 <b>and </b><br/><a NAME="E2:26"/><i><font color="Green" title="E20">A2</font></i>: 
<font color="Maroon" title="c3">F</font> <a href="incsp_1.html#NR7" title="INCSP_1:NR.7">is_coplanar</a> 
 ;<br/>

<b>consider </b><font color="Maroon" title="c4">P</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="E4:26"/><i><font color="Green" title="E21">A3</font></i>: 
<font color="Maroon" title="c3">F</font> <a href="incsp_1.html#R5" title="INCSP_1:pred.5">on</a> <font color="Maroon" title="c4">P</font>
 <b>by </b><i><a class="txt" href="incsp_1.html#E2:26"><i><font color="Green" title="E20">A2</font></i></a>, <a class="ref" href="incsp_1.html#D7" target="_self" title="INCSP_1:def.7">Def7</a></i>;<br/>
<b>take </b>
<font color="Maroon" title="c4">P</font>
; <i><font color="Red">:: according to </font></i><a class="ref" href="incsp_1.html#D7" target="_self" title="INCSP_1:def.7">INCSP_1:def 7</a><br/>

<b>let </b><font color="Maroon" title="c5">A</font> be   <a href="incsp_1.html#NM1" title="INCSP_1:NM.1">POINT</a> of <font color="Maroon" title="c1">S</font>; <i><font color="Red">:: according to </font></i><a class="ref" href="incsp_1.html#D5" target="_self" title="INCSP_1:def.5">INCSP_1:def 5</a><br/>

<b>assume </b><a NAME="E5:26"/>
<font color="Maroon" title="c5">A</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c2">G</font>
 ;<br/>

<b>hence </b><a NAME="E6:26"/>
<font color="Maroon" title="c5">A</font> <a href="incsp_1.html#R2" title="INCSP_1:pred.2">on</a> <font color="Maroon" title="c4">P</font>
 <b>by </b><i><a class="txt" href="incsp_1.html#E1:26"><i><font color="Green" title="E19">A1</font></i></a>, <a class="txt" href="incsp_1.html#E4:26"><i><font color="Green" title="E21">A3</font></i></a>, <a class="ref" href="incsp_1.html#D5" target="_self" title="INCSP_1:def.5">Def5</a></i>;<br/>


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