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<b>let </b><font color="Maroon" title="c1">n</font> be    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="numbers.html#K5" title="NUMBERS:func.5">NAT</a> ;<br/><b>let </b><font color="Maroon" title="c2">p1</font>, <font color="Maroon" title="c3">p2</font> be   <a href="pre_topc.html#NM2" title="PRE_TOPC:NM.2">Point</a> of <span class="p1">(<span class="default"><a href="euclid.html#K15" title="EUCLID:func.15">TOP-REAL</a> <font color="Maroon" title="c1">n</font></span>)</span>;<br/>





<b>consider </b><font color="Maroon" title="c4">x1</font>, <font color="Maroon" title="c5">x2</font> being    <a href="finseq_2.html#M2" title="FINSEQ_2:mode.2">Element</a> of  <a href="euclid.html#K1" title="EUCLID:func.1">REAL</a> <font color="Maroon" title="c1">n</font><b> such that </b><br/><a NAME="E2:59"/><i><font color="Green" title="E39">A1</font></i>: 
( <font color="Maroon" title="c4">x1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c2">p1</font> &amp; <font color="Maroon" title="c5">x2</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c3">p2</font> &amp;  <a href="euclid_4.html#K2" title="EUCLID_4:func.2">Line</a> <font color="Maroon" title="c4">x1</font>,<font color="Maroon" title="c5">x2</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="euclid_4.html#K3" title="EUCLID_4:func.3">Line</a> <font color="Maroon" title="c2">p1</font>,<font color="Maroon" title="c3">p2</font> )
 <b>by </b><i><a class="txt" href="euclid_4.html#E65"><i><font color="Green" title="E37">Lm13</font></i></a></i>;<br/>
<b>consider </b><font color="Maroon" title="c6">x2'</font>, <font color="Maroon" title="c7">x1'</font> being    <a href="finseq_2.html#M2" title="FINSEQ_2:mode.2">Element</a> of  <a href="euclid.html#K1" title="EUCLID:func.1">REAL</a> <font color="Maroon" title="c1">n</font><b> such that </b><br/><a NAME="E4:59"/><i><font color="Green" title="E40">A2</font></i>: 
( <font color="Maroon" title="c6">x2'</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c3">p2</font> &amp; <font color="Maroon" title="c7">x1'</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c2">p1</font> &amp;  <a href="euclid_4.html#K2" title="EUCLID_4:func.2">Line</a> <font color="Maroon" title="c6">x2'</font>,<font color="Maroon" title="c7">x1'</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="euclid_4.html#K3" title="EUCLID_4:func.3">Line</a> <font color="Maroon" title="c3">p2</font>,<font color="Maroon" title="c2">p1</font> )
 <b>by </b><i><a class="txt" href="euclid_4.html#E65"><i><font color="Green" title="E37">Lm13</font></i></a></i>;<br/>
<b>thus </b><a NAME="E5:59"/>
 <a href="euclid_4.html#K3" title="EUCLID_4:func.3">Line</a> <font color="Maroon" title="c2">p1</font>,<font color="Maroon" title="c3">p2</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="euclid_4.html#K3" title="EUCLID_4:func.3">Line</a> <font color="Maroon" title="c3">p2</font>,<font color="Maroon" title="c2">p1</font>
 <b>by </b><i><a class="txt" href="euclid_4.html#E2:59"><i><font color="Green" title="E39">A1</font></i></a>, <a class="txt" href="euclid_4.html#E4:59"><i><font color="Green" title="E40">A2</font></i></a></i>;<br/>


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