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<b>let </b><font color="Maroon" title="c1">S</font> be   <a href="incsp_1.html#NM4" title="INCSP_1:NM.4">IncSpace</a>;<br/><b>let </b><font color="Maroon" title="c2">A</font>, <font color="Maroon" title="c3">B</font>, <font color="Maroon" title="c4">C</font> be   <a href="incsp_1.html#NM1" title="INCSP_1:NM.1">POINT</a> of <font color="Maroon" title="c1">S</font>;<br/>







<b>assume </b><a NAME="E1:57"/><i><font color="Green" title="E48">A1</font></i>: 
not <span class="p1"><a href="domain_1.html#K8" title="DOMAIN_1:func.8">{</a><span class="default"><font color="Maroon" title="c2">A</font>,<font color="Maroon" title="c3">B</font>,<font color="Maroon" title="c4">C</font></span><a href="domain_1.html#K8" title="DOMAIN_1:func.8">}</a></span> <a href="incsp_1.html#NR6" title="INCSP_1:NR.6">is_collinear</a> 
 ;<br/>

<a NAME="E2:57"/><b>then </b><i><font color="Green" title="E49">A2</font></i>: 
not <span class="p1"><a href="domain_1.html#K8" title="DOMAIN_1:func.8">{</a><span class="default"><font color="Maroon" title="c4">C</font>,<font color="Maroon" title="c2">A</font>,<font color="Maroon" title="c3">B</font></span><a href="domain_1.html#K8" title="DOMAIN_1:func.8">}</a></span> <a href="incsp_1.html#NR6" title="INCSP_1:NR.6">is_collinear</a> 
 
<b>by </b><i><a class="ref" href="enumset1.html#T100" title="ENUMSET1:th.100">ENUMSET1:100</a></i>;<br/>
<b>thus </b> <a href="incsp_1.html#K2" title="INCSP_1:func.2">Plane</a> <font color="Maroon" title="c2">A</font>,<font color="Maroon" title="c3">B</font>,<font color="Maroon" title="c4">C</font> = 
 <a href="incsp_1.html#K2" title="INCSP_1:func.2">Plane</a> <font color="Maroon" title="c2">A</font>,<font color="Maroon" title="c4">C</font>,<font color="Maroon" title="c3">B</font>
<b>by </b><i><a class="txt" href="incsp_1.html#E1:57"><i><font color="Green" title="E48">A1</font></i></a>, <a class="ref" href="incsp_1.html#T58" target="_self" title="INCSP_1:th.58">Th58</a></i>
<br/>.= 
 <a href="incsp_1.html#K2" title="INCSP_1:func.2">Plane</a> <font color="Maroon" title="c4">C</font>,<font color="Maroon" title="c2">A</font>,<font color="Maroon" title="c3">B</font>
<b>by </b><i><a class="txt" href="incsp_1.html#E2:57"><i><font color="Green" title="E49">A2</font></i></a>, <a class="ref" href="incsp_1.html#T59" target="_self" title="INCSP_1:th.59">Th59</a></i>
;<br/>


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