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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> be    <a href="collsp.html#M2" title="COLLSP:mode.2">LINE</a> of <font color="Maroon" title="c10">CLSP</font>;<br/>



<b>consider </b><font color="Maroon" title="c12">a</font>, <font color="Maroon" title="c13">b</font> being   <a href="pre_topc.html#NM2" title="PRE_TOPC:NM.2">Point</a> of <font color="Maroon" title="c10">CLSP</font><b> such that </b><br/><a NAME="E2:31"/><i><font color="Green" title="E25">A1</font></i>: 
<font color="Maroon" title="c12">a</font> <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a> <font color="Maroon" title="c13">b</font>
 <b>and </b><br/><a NAME="E3:31"/><i><font color="Green" title="E26">A2</font></i>: 
<font color="Maroon" title="c11">P</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="collsp.html#K1" title="COLLSP:func.1">Line</a> <font color="Maroon" title="c12">a</font>,<font color="Maroon" title="c13">b</font>
 <b>by </b><i><a class="ref" href="collsp.html#D7" target="_self" title="COLLSP:def.7">Def7</a></i>;<br/>
<b>take </b>
<font color="Maroon" title="c12">a</font>
;<br/>

<b>take </b>
<font color="Maroon" title="c13">b</font>
;<br/>

<b>thus </b><a NAME="E4:31"/>
( <font color="Maroon" title="c12">a</font> <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a> <font color="Maroon" title="c13">b</font> &amp; <font color="Maroon" title="c12">a</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c11">P</font> &amp; <font color="Maroon" title="c13">b</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c11">P</font> )
 <b>by </b><i><a class="txt" href="collsp.html#E2:31"><i><font color="Green" title="E25">A1</font></i></a>, <a class="txt" href="collsp.html#E3:31"><i><font color="Green" title="E26">A2</font></i></a>, <a class="ref" href="collsp.html#T16" target="_self" title="COLLSP:th.16">Th16</a></i>;<br/>


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