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<b>let </b><font color="Maroon" title="c10">CLSP</font> be  <a href="collsp.html#V4" title="COLLSP:attr.4">proper</a> <a href="collsp.html#NM2" title="COLLSP:NM.2">CollSp</a>;<br/><b>let </b><font color="Maroon" title="c11">p</font>, <font color="Maroon" title="c12">q</font> be   <a href="pre_topc.html#NM2" title="PRE_TOPC:NM.2">Point</a> of <font color="Maroon" title="c10">CLSP</font>;<br/><b>let </b><font color="Maroon" title="c13">P</font> be    <a href="collsp.html#M2" title="COLLSP:mode.2">LINE</a> of <font color="Maroon" title="c10">CLSP</font>;<br/>







<b>assume </b><a NAME="E1:37"/><i><font color="Green" title="E30">A1</font></i>: 
( <font color="Maroon" title="c11">p</font> <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a> <font color="Maroon" title="c12">q</font> &amp; <font color="Maroon" title="c11">p</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c13">P</font> &amp; <font color="Maroon" title="c12">q</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c13">P</font> )
 ;<br/>

<b>then reconsider </b><font color="Maroon" title="c14">Q</font> =  <a href="collsp.html#K1" title="COLLSP:func.1">Line</a> <font color="Maroon" title="c11">p</font>,<font color="Maroon" title="c12">q</font> as    <a href="collsp.html#M2" title="COLLSP:mode.2">LINE</a> of <font color="Maroon" title="c10">CLSP</font> <b>by </b><i><a class="ref" href="collsp.html#D7" target="_self" title="COLLSP:def.7">Def7</a></i>;<br/>
<a NAME="E3:37"/>
<font color="Maroon" title="c14">Q</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a> <font color="Maroon" title="c13">P</font>
 
<b>by </b><i><a class="txt" href="collsp.html#E1:37"><i><font color="Green" title="E30">A1</font></i></a>, <a class="ref" href="collsp.html#T27" target="_self" title="COLLSP:th.27">Th27</a></i>;<br/>
<b>hence </b><a NAME="E4:37"/>
 <a href="collsp.html#K1" title="COLLSP:func.1">Line</a> <font color="Maroon" title="c11">p</font>,<font color="Maroon" title="c12">q</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c13">P</font>
 <b>by </b><i><a class="ref" href="collsp.html#T26" target="_self" title="COLLSP:th.26">Th26</a></i>;<br/>


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