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<b>let </b><font color="Maroon" title="c1">k</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">G</font> be   <a href="goboard1.html#NM1" title="GOBOARD1:NM.1">Go-board</a>;<br/><b>let </b><font color="Maroon" title="c3">f</font> be   <a href="struct_0.html#NM7" title="STRUCT_0:NM.7">FinSequence</a> of <span class="p1">(<span class="default"><a href="euclid.html#K15" title="EUCLID:func.15">TOP-REAL</a> 2</span>)</span>;<br/><b>let </b><font color="Maroon" title="c4">p</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>;<br/>







<b>assume </b><b>that </b><br/><a NAME="E1:25"/><i><font color="Green" title="E25">A1</font></i>: 
2 <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>
 <b>and </b><br/><a NAME="E2:25"/><i><font color="Green" title="E26">A2</font></i>: 
2 <a href="xxreal_0.html#R1" title="XXREAL_0:pred.1">&lt;=</a>  <a href="matrix_1.html#K1" title="MATRIX_1:func.1">width</a> <font color="Maroon" title="c2">G</font>
 <b>and </b><br/><a NAME="E3:25"/><i><font color="Green" title="E27">A3</font></i>: 
<font color="Maroon" title="c3">f</font> <a href="goboard1.html#R1" title="GOBOARD1:pred.1">is_sequence_on</a> <font color="Maroon" title="c2">G</font>
 <b>and </b><br/><a NAME="E4:25"/><i><font color="Green" title="E28">A4</font></i>: 
1 <a href="xxreal_0.html#R1" title="XXREAL_0:pred.1">&lt;=</a> <font color="Maroon" title="c1">k</font>
 <b>and </b><br/><a NAME="E5:25"/><i><font color="Green" title="E29">A5</font></i>: 
<font color="Maroon" title="c1">k</font> <a href="nat_1.html#K1" title="NAT_1:func.1">+</a> 1 <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="c3">f</font>
 <b>and </b><br/><a NAME="E6:25"/><i><font color="Green" title="E30">A6</font></i>: 
<font color="Maroon" title="c4">p</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="gobrd13.html#K2" title="GOBRD13:func.2">Values</a> <font color="Maroon" title="c2">G</font>
 <b>and </b><br/><a NAME="E7:25"/><i><font color="Green" title="E31">A7</font></i>: 
<font color="Maroon" title="c4">p</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="topreal1.html#K4" title="TOPREAL1:func.4">LSeg</a> <font color="Maroon" title="c3">f</font>,<font color="Maroon" title="c1">k</font>
 ;<br/>

<b>consider </b><font color="Maroon" title="c5">i</font>, <font color="Maroon" title="c6">j</font> being    <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> <b> such that </b><br/><a NAME="E9:25"/><i><font color="Green" title="E32">A8</font></i>: 
( 1 <a href="xxreal_0.html#R1" title="XXREAL_0:pred.1">&lt;=</a> <font color="Maroon" title="c5">i</font> &amp; <font color="Maroon" title="c5">i</font> <a href="nat_1.html#K1" title="NAT_1:func.1">+</a> 1 <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> )
 <b>and </b><br/><a NAME="E10:25"/><i><font color="Green" title="E33">A9</font></i>: 
( 1 <a href="xxreal_0.html#R1" title="XXREAL_0:pred.1">&lt;=</a> <font color="Maroon" title="c6">j</font> &amp; <font color="Maroon" title="c6">j</font> <a href="nat_1.html#K1" title="NAT_1:func.1">+</a> 1 <a href="xxreal_0.html#R1" title="XXREAL_0:pred.1">&lt;=</a>  <a href="matrix_1.html#K1" title="MATRIX_1:func.1">width</a> <font color="Maroon" title="c2">G</font> )
 <b>and </b><br/><a NAME="E11:25"/><i><font color="Green" title="E34">A10</font></i>: 
 <a href="topreal1.html#K4" title="TOPREAL1:func.4">LSeg</a> <font color="Maroon" title="c3">f</font>,<font color="Maroon" title="c1">k</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a>  <a href="goboard5.html#K3" title="GOBOARD5:func.3">cell</a> <font color="Maroon" title="c2">G</font>,<font color="Maroon" title="c5">i</font>,<font color="Maroon" title="c6">j</font>
 <b>by </b><i><a class="txt" href="jordan9.html#E1:25"><i><font color="Green" title="E25">A1</font></i></a>, <a class="txt" href="jordan9.html#E2:25"><i><font color="Green" title="E26">A2</font></i></a>, <a class="txt" href="jordan9.html#E3:25"><i><font color="Green" title="E27">A3</font></i></a>, <a class="txt" href="jordan9.html#E4:25"><i><font color="Green" title="E28">A4</font></i></a>, <a class="txt" href="jordan9.html#E5:25"><i><font color="Green" title="E29">A5</font></i></a>, <a class="ref" href="jordan9.html#T24" target="_self" title="JORDAN9:th.24">Th24</a></i>;<br/>
<a NAME="E12:25"/><i><font color="Green" title="E35">A11</font></i>: 
 <a href="topreal1.html#K4" title="TOPREAL1:func.4">LSeg</a> <font color="Maroon" title="c3">f</font>,<font color="Maroon" title="c1">k</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="topreal1.html#K3" title="TOPREAL1:func.3">LSeg</a> <span class="p1">(<span class="default"><font color="Maroon" title="c3">f</font> <a href="finseq_4.html#K4" title="FINSEQ_4:func.4">/.</a> <font color="Maroon" title="c1">k</font></span>)</span>,<span class="p1">(<span class="default"><font color="Maroon" title="c3">f</font> <a href="finseq_4.html#K4" title="FINSEQ_4:func.4">/.</a> <span class="p2">(<span class="default"><font color="Maroon" title="c1">k</font> <a href="nat_1.html#K1" title="NAT_1:func.1">+</a> 1</span>)</span></span>)</span>
 
<b>by </b><i><a class="txt" href="jordan9.html#E4:25"><i><font color="Green" title="E28">A4</font></i></a>, <a class="txt" href="jordan9.html#E5:25"><i><font color="Green" title="E29">A5</font></i></a>, <a class="ref" href="topreal1.html#D5" title="TOPREAL1:def.5">TOPREAL1:def 5</a></i>;<br/>
<a NAME="E13:25"/>
<font color="Maroon" title="c4">p</font> <a href="sppol_1.html#R1" title="SPPOL_1:pred.1">is_extremal_in</a>  <a href="goboard5.html#K3" title="GOBOARD5:func.3">cell</a> <font color="Maroon" title="c2">G</font>,<font color="Maroon" title="c5">i</font>,<font color="Maroon" title="c6">j</font>
 
<b>by </b><i><a class="txt" href="jordan9.html#E6:25"><i><font color="Green" title="E30">A6</font></i></a>, <a class="txt" href="jordan9.html#E7:25"><i><font color="Green" title="E31">A7</font></i></a>, <a class="txt" href="jordan9.html#E9:25"><i><font color="Green" title="E32">A8</font></i></a>, <a class="txt" href="jordan9.html#E10:25"><i><font color="Green" title="E33">A9</font></i></a>, <a class="txt" href="jordan9.html#E11:25"><i><font color="Green" title="E34">A10</font></i></a>, <a class="ref" href="jordan9.html#T23" target="_self" title="JORDAN9:th.23">Th23</a></i>;<br/>
<b>hence </b><a NAME="E14:25"/>
( <font color="Maroon" title="c4">p</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c3">f</font> <a href="finseq_4.html#K4" title="FINSEQ_4:func.4">/.</a> <font color="Maroon" title="c1">k</font> or <font color="Maroon" title="c4">p</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c3">f</font> <a href="finseq_4.html#K4" title="FINSEQ_4:func.4">/.</a> <span class="p1">(<span class="default"><font color="Maroon" title="c1">k</font> <a href="nat_1.html#K1" title="NAT_1:func.1">+</a> 1</span>)</span> )
 <b>by </b><i><a class="txt" href="jordan9.html#E7:25"><i><font color="Green" title="E31">A7</font></i></a>, <a class="txt" href="jordan9.html#E11:25"><i><font color="Green" title="E34">A10</font></i></a>, <a class="txt" href="jordan9.html#E12:25"><i><font color="Green" title="E35">A11</font></i></a>, <a class="ref" href="sppol_1.html#D1" title="SPPOL_1:def.1">SPPOL_1:def 1</a></i>;<br/>


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