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还是不解，难不成题意理解有误？

Posted by pladene at 2004-12-14 22:10:29 on Problem 2129
In Reply To:Re:可以解释一下吗？ Posted by:atlas_of_rruucc at 2004-12-01 11:41:40 
n = 3, d = 2

i = j = 1，有 n | (i - j)

f(x, y) = xy
旋转alpha角度后
f'(x, y) = (sqrt(3)/4)*(y*y-x*x) + xy != f(x, y)

???
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