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<b>let </b><font color="Maroon">G</font> be    <a href="incsp_1.html#L1">IncProjStr</a> ;<br/>

<b>assume </b><b>that </b><br/><a NAME="E1:26"/><i><font color="Green">E36</font></i>: 
 ex <font color="Olive">a</font>, <font color="Olive">b</font>, <font color="Olive">c</font> being  <a href="incsp_1.html#NM1">POINT</a> of <font color="Maroon">G</font> st <font color="Olive">a</font>,<font color="Olive">b</font>,<font color="Olive">c</font> <a href="projpl_1.html#NR6" target="_self">is_a_triangle</a> 
 <b>and </b><br/><a NAME="E2:26"/><i><font color="Green">E37</font></i>: 
for <font color="Olive">p</font>, <font color="Olive">q</font> being  <a href="incsp_1.html#NM1">POINT</a> of <font color="Maroon">G</font>  ex <font color="Olive">M</font> being  <a href="incsp_1.html#NM2">LINE</a> of <font color="Maroon">G</font> st <font color="Olive">p</font>,<font color="Olive">q</font> <a href="incproj.html#R3">on</a> <font color="Olive">M</font>
 ;<br/>

<b>consider </b><font color="Maroon">a</font> being   <a href="incsp_1.html#NM1">POINT</a> of <font color="Maroon">G</font>, <font color="Maroon">b</font> being   <a href="incsp_1.html#NM1">POINT</a> of <font color="Maroon">G</font>, <font color="Maroon">c</font> being   <a href="incsp_1.html#NM1">POINT</a> of <font color="Maroon">G</font><b> such that </b><br/><a NAME="E4:26"/><i><font color="Green">E40</font></i>: 
<font color="Maroon">a</font>,<font color="Maroon">b</font>,<font color="Maroon">c</font> <a href="projpl_1.html#NR6" target="_self">is_a_triangle</a> 
 <b>by </b><i/>;<br/>
<b>consider </b><font color="Maroon">P</font> being   <a href="incsp_1.html#NM2">LINE</a> of <font color="Maroon">G</font><b> such that </b><br/><a NAME="E6:26"/><i><font color="Green">E41</font></i>: 
<font color="Maroon">a</font>,<font color="Maroon">b</font> <a href="incproj.html#R3">on</a> <font color="Maroon">P</font>
 <b>by </b><i/>;<br/>
<a NAME="E7:26"/><i><font color="Green">E42</font></i>: 
( <font color="Maroon">a</font> <a href="incsp_1.html#R1">on</a> <font color="Maroon">P</font> &amp; <font color="Maroon">b</font> <a href="incsp_1.html#R1">on</a> <font color="Maroon">P</font> )
 
<b>by </b><i>, <a class="ref" href="incproj.html#D7">INCPROJ:def 7</a></i>;<br/>
<b>take </b>
<font color="Maroon">c</font>
;<br/>

<b>take </b>
<font color="Maroon">P</font>
;<br/>

<b>thus </b><a NAME="E8:26"/>
<font color="Maroon">c</font> <a href="projpl_1.html#NR1" target="_self">|'</a> <font color="Maroon">P</font>
 <b>by </b><i>, , </i>;<br/>


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