Posted by karl (x1,y1) in the boarder of D1 and (x2,y2) in the boarder of D2, x1=x2, and y1=y2 implies (x1,y1) ~ (x2,y2). this gives at most two equivalent points. Don't we need more than that?
on October 8, 2007, 2:50 pm
In this problem, the equivalence relation is
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