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<b>let </b><font color="Maroon">c<sub>1</sub></font> be  non <a href="funct_1.html#V3">constant</a> <a href="goboard5.html#V2">standard</a> <a href="goboard5.html#NM1">special_circular_sequence</a>;<br/>

<b>assume </b><a NAME="E1:7"/><i><font color="Green">E7</font></i>: 
<font color="Maroon">c<sub>1</sub></font> <a href="finseq_4.html#K4">/.</a> 1 <a href="hidden.html#R1">=</a>  <a href="pscomp_1.html#K29">N-min</a> <span class="p1">(<span class="default"><a href="topreal1.html#K5">L~</a> <font color="Maroon">c<sub>1</sub></font></span>)</span>
 ;<br/>

<div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="7_1"><b>per </b></a><a class="txt" onclick="hs(this)" href="javascript:()"><b>cases </b></a><span class="hide"><a NAME="E1:7_1"/>
( <font color="Maroon">c<sub>1</sub></font> is <a href="sprect_2.html#V1">clockwise_oriented</a> or  <a href="goboard9.html#K1">Rev</a> <font color="Maroon">c<sub>1</sub></font> is <a href="sprect_2.html#V1">clockwise_oriented</a> )
 </span><b>by </b><i><a class="ref" href="revrot_1.html#T38">REVROT_1:38</a></i>;<br/><div class="add"><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="7_1_1"><b>suppose </b></a><a NAME="E1:7_1_1"/>
<font color="Maroon">c<sub>1</sub></font> is <a href="sprect_2.html#V1">clockwise_oriented</a>
 ;<br/><div class="add"><b>hence </b><a NAME="E2:7_1_1"/>
 <a href="goboard9.html#K2">LeftComp</a> <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="goboard9.html#K3">RightComp</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="txt" href="sprect_4.html#E1:7"><i><font color="Green">E7</font></i></a>, <a class="txt" href="sprect_4.html#E7"><i><font color="Green">Lemma5</font></i></a></i>;<br/></div><b>end;</b></div><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="7_1_2"><b>suppose </b></a><a NAME="E1:7_1_2"/><i><font color="Green">E8</font></i>: 
 <a href="goboard9.html#K1">Rev</a> <font color="Maroon">c<sub>1</sub></font> is <a href="sprect_2.html#V1">clockwise_oriented</a>
 ;<br/><div class="add"><i><font color="Green">E9</font></i>:  <a href="pscomp_1.html#K29">N-min</a> <span class="p1">(<span class="default"><a href="topreal1.html#K5">L~</a> <span class="p2">(<span class="default"><a href="goboard9.html#K1">Rev</a> <font color="Maroon">c<sub>1</sub></font></span>)</span></span>)</span> = 
 <a href="pscomp_1.html#K29">N-min</a> <span class="p1">(<span class="default"><a href="topreal1.html#K5">L~</a> <font color="Maroon">c<sub>1</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="sppol_2.html#T22">SPPOL_2:22</a></i>
<br/>.= 
<span class="p1">(<span class="default"><a href="goboard9.html#K1">Rev</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="finseq_4.html#K4">/.</a> <span class="p1">(<span class="default"><a href="finseq_1.html#K3">len</a> <font color="Maroon">c<sub>1</sub></font></span>)</span>
<b>by </b><i><a class="txt" href="sprect_4.html#E1:7"><i><font color="Green">E7</font></i></a>, <a class="ref" href="finseq_5.html#T68">FINSEQ_5:68</a></i>
<br/>.= 
<span class="p1">(<span class="default"><a href="goboard9.html#K1">Rev</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="finseq_4.html#K4">/.</a> <span class="p1">(<span class="default"><a href="finseq_1.html#K3">len</a> <span class="p2">(<span class="default"><a href="goboard9.html#K1">Rev</a> <font color="Maroon">c<sub>1</sub></font></span>)</span></span>)</span>
<b>by </b><i><a class="ref" href="finseq_5.html#D3">FINSEQ_5:def 3</a></i>
<br/>.= 
<span class="p1">(<span class="default"><a href="goboard9.html#K1">Rev</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="finseq_4.html#K4">/.</a> 1
<b>by </b><i><a class="ref" href="finseq_6.html#D1">FINSEQ_6:def 1</a></i>
;<br/><a NAME="E3:7_1_2"/>
(  <a href="goboard9.html#K2">LeftComp</a> <span class="p1">(<span class="default"><a href="goboard9.html#K1">Rev</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="goboard9.html#K3">RightComp</a> <font color="Maroon">c<sub>1</sub></font> &amp;  <a href="goboard9.html#K3">RightComp</a> <span class="p1">(<span class="default"><a href="goboard9.html#K1">Rev</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="goboard9.html#K2">LeftComp</a> <font color="Maroon">c<sub>1</sub></font> )
 <b>by </b><i><a class="ref" href="goboard9.html#T26">GOBOARD9:26</a>, <a class="ref" href="goboard9.html#T27">GOBOARD9:27</a></i>;<br/><b>hence </b><a NAME="E4:7_1_2"/>
 <a href="goboard9.html#K2">LeftComp</a> <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="goboard9.html#K3">RightComp</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="txt" href="sprect_4.html#E1:7_1_2"><i><font color="Green">E8</font></i></a>, <a class="txt" href="sprect_4.html#E2:7_1_2"><i><font color="Green">E9</font></i></a>, <a class="txt" href="sprect_4.html#E7"><i><font color="Green">Lemma5</font></i></a></i>;<br/></div><b>end;</b></div></div><b>end;</b></div>

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