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<b>let </b><font color="Maroon" title="c1">i</font> be    <a href="subset_1.html#M2" title="SUBSET_1:mode.2">Element</a> of  <a href="numbers.html#K5" title="NUMBERS:func.5">NAT</a> ;<br/><b>let </b><font color="Maroon" title="c2">G</font> be   <a href="goboard1.html#NM1" title="GOBOARD1:NM.1">Go-board</a>;<br/>



<b>assume </b><a NAME="E1:25"/><i><font color="Green" title="E24">A1</font></i>: 
<font color="Maroon" title="c1">i</font> <a href="xxreal_0.html#R1" title="XXREAL_0:pred.1">&lt;=</a>  <a href="finseq_1.html#K3" title="FINSEQ_1:func.3">len</a> <font color="Maroon" title="c2">G</font>
 ;<br/>

<b>set </b><font color="Maroon" title="c3">P</font> =  <a href="goboard5.html#K1" title="GOBOARD5:func.1">v_strip</a> <font color="Maroon" title="c2">G</font>,<font color="Maroon" title="c1">i</font>;<br/>
<b>let </b><font color="Maroon" title="c4">w1</font>, <font color="Maroon" title="c5">w2</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> 2</span>)</span>; <i><font color="Red">:: according to </font></i><a class="ref" href="jordan1.html#D1" title="JORDAN1:def.1">JORDAN1:def 1</a><br/>

<b>assume </b><a NAME="E2:25"/><i><font color="Green" title="E25">A2</font></i>: 
( <font color="Maroon" title="c4">w1</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="goboard5.html#K1" title="GOBOARD5:func.1">v_strip</a> <font color="Maroon" title="c2">G</font>,<font color="Maroon" title="c1">i</font> &amp; <font color="Maroon" title="c5">w2</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="goboard5.html#K1" title="GOBOARD5:func.1">v_strip</a> <font color="Maroon" title="c2">G</font>,<font color="Maroon" title="c1">i</font> )
 ;<br/>

<a NAME="E3:25"/>
( <font color="Maroon" title="c4">w1</font> <a href="euclid.html#K21" title="EUCLID:func.21">`1</a>  <a href="xxreal_0.html#R1" title="XXREAL_0:pred.1">&lt;=</a> <font color="Maroon" title="c5">w2</font> <a href="euclid.html#K21" title="EUCLID:func.21">`1</a>  or <font color="Maroon" title="c5">w2</font> <a href="euclid.html#K21" title="EUCLID:func.21">`1</a>  <a href="xxreal_0.html#R1" title="XXREAL_0:pred.1">&lt;=</a> <font color="Maroon" title="c4">w1</font> <a href="euclid.html#K21" title="EUCLID:func.21">`1</a>  )
 
;<br/>
<b>hence </b><a NAME="E4:25"/>
 <a href="topreal1.html#K3" title="TOPREAL1:func.3">LSeg</a> <font color="Maroon" title="c4">w1</font>,<font color="Maroon" title="c5">w2</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a>  <a href="goboard5.html#K1" title="GOBOARD5:func.1">v_strip</a> <font color="Maroon" title="c2">G</font>,<font color="Maroon" title="c1">i</font>
 <b>by </b><i><a class="txt" href="jordan12.html#E1:25"><i><font color="Green" title="E24">A1</font></i></a>, <a class="txt" href="jordan12.html#E2:25"><i><font color="Green" title="E25">A2</font></i></a>, <a class="txt" href="jordan12.html#E24"><i><font color="Green" title="E22">Lm4</font></i></a></i>;<br/>


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