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Old 01-25-2013, 03:13 PM
geekoftheweek geekoftheweek is offline
Join Date: Jun 2012
Posts: 26
Default Re: Concentric circles in Q10

Originally Posted by ilya239 View Post
So once the set of N points is fixed, and we pick different subsets of the N points and try to cover them with "donuts" -- all donuts must be centered at the same point? We can't use a donut centered at p1 to cover {x1,x2} but a donut centered at a different point p2 to cover {x3,x4}? In other words, after picking N points, we pick ONE origin, and _then_ can pick donuts centered at that origin only?
This approach confuses my understanding of the problem. Why doesn't the symmetry of the problem reduce it to 1-D (r instead of x) with two parameters, i.e. the "positive intervals" case in example 2.2.2?
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