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<b>assume </b><a NAME="E1:53_1_1"/>
 <a href="sprect_1.html#K1" target="_self">SpStSeq</a> <font color="Maroon">c<sub>1</sub></font> is <a href="funct_1.html#V3">constant</a>
 ;<br/>

<a NAME="E2:53_1_1"/><b>then </b><i><font color="Green">E38</font></i>: 
<span class="p1"><a href="finseq_4.html#K3">&lt;*</a><span class="default"><span class="p2">(<span class="default"><a href="pscomp_1.html#K20">NW-corner</a> <font color="Maroon">c<sub>1</sub></font></span>)</span>,<span class="p2">(<span class="default"><a href="pscomp_1.html#K21">NE-corner</a> <font color="Maroon">c<sub>1</sub></font></span>)</span>,<span class="p2">(<span class="default"><a href="pscomp_1.html#K22">SE-corner</a> <font color="Maroon">c<sub>1</sub></font></span>)</span></span><a href="finseq_4.html#K3">*&gt;</a></span> is <a href="funct_1.html#V3">constant</a>
 
<b>by </b><i><a class="ref" href="sprect_1.html#T3" target="_self">Th3</a></i>;<br/>
<span class="p1"><a href="euclid.html#K23">|[</a><span class="default"><span class="p2">(<span class="default"><a href="pscomp_1.html#K15">W-bound</a> <font color="Maroon">c<sub>1</sub></font></span>)</span>,<span class="p2">(<span class="default"><a href="pscomp_1.html#K16">N-bound</a> <font color="Maroon">c<sub>1</sub></font></span>)</span></span><a href="euclid.html#K23">]|</a></span> = 
 <a href="pscomp_1.html#K20">NW-corner</a> <font color="Maroon">c<sub>1</sub></font>

<br/>.= 
 <a href="pscomp_1.html#K21">NE-corner</a> <font color="Maroon">c<sub>1</sub></font>
<b>by </b><i><a class="txt" href="sprect_1.html#E2:53_1_1"><i><font color="Green">E38</font></i></a>, <a class="ref" href="sprect_1.html#T5" target="_self">Th5</a></i>
<br/>.= 
<span class="p1"><a href="euclid.html#K23">|[</a><span class="default"><span class="p2">(<span class="default"><a href="pscomp_1.html#K17">E-bound</a> <font color="Maroon">c<sub>1</sub></font></span>)</span>,<span class="p2">(<span class="default"><a href="pscomp_1.html#K16">N-bound</a> <font color="Maroon">c<sub>1</sub></font></span>)</span></span><a href="euclid.html#K23">]|</a></span>

;<br/>
<a NAME="E4:53_1_1"/><b>then </b>
 <a href="pscomp_1.html#K15">W-bound</a> <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a>  <a href="pscomp_1.html#K17">E-bound</a> <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="ref" href="sppol_2.html#T1">SPPOL_2:1</a></i>;<br/>
<b>hence </b><a NAME="E5:53_1_1"/>
contradiction
 <b>by </b><i><a class="ref" href="sprect_1.html#T17" target="_self">Th17</a></i>;<br/>


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