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<b>let </b><font color="Maroon">i</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/><b>let </b><font color="Maroon">j</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/><b>let </b><font color="Maroon">G</font> be   <a href="goboard1.html#NM1">Go-board</a>;<br/>





<b>assume </b><a NAME="E1:28"/><i><font color="Green">E42</font></i>: 
( <font color="Maroon">i</font> <a href="xxreal_0.html#R1">&lt;=</a>  <a href="finseq_1.html#K3">len</a> <font color="Maroon">G</font> &amp; <font color="Maroon">j</font> <a href="xxreal_0.html#R1">&lt;=</a>  <a href="matrix_1.html#K1">width</a> <font color="Maroon">G</font> )
 ;<br/>

<a NAME="E2:28"/>
(  <a href="goboard5.html#K1">v_strip</a> <font color="Maroon">G</font>,<font color="Maroon">i</font> is <a href="jordan1.html#V1">convex</a> &amp;  <a href="goboard5.html#K2">h_strip</a> <font color="Maroon">G</font>,<font color="Maroon">j</font> is <a href="jordan1.html#V1">convex</a> )
 
<b>by </b><i>, , </i>;<br/>
<b>hence </b><a NAME="E3:28"/>
 <a href="goboard5.html#K3">cell</a> <font color="Maroon">G</font>,<font color="Maroon">i</font>,<font color="Maroon">j</font> is <a href="jordan1.html#V1">convex</a>
 <b>by </b><i><a class="ref" href="goboard9.html#T9">GOBOARD9:9</a></i>;<br/>


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