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• W2068019092 abstract "A collection of n balls in d dimensions forms a k -ply system if no point in the space is covered by more than k balls. We show that for every k -ply system Γ, there is a sphere S that intersects at most O ( k 1/ d n 1−1/ d ) balls of Γ and divides the remainder of Γ into two parts: those in the interior and those in the exterior of the sphere S , respectively, so that the larger part contains at most (1−1/( d +2)) n balls. This bound of ( O ( k 1/ d n 1−1/ d ) is the best possible in both n and k . We also present a simple randomized algorithm to find such a sphere in O(n) time. Our result implies that every k -nearest neighbor graphs of n points in d dimensions has a separator of size O ( k 1/ d n 1−1/ d ). In conjunction with a result of Koebe that every triangulated planar graph is isomorphic to the intersection graph of a disk-packing, our result not only gives a new geometric proof of the planar separator theorem of Lipton and Tarjan, but also generalizes it to higher dimensions. The separator algorithm can be used for point location and geometric divide and conquer in a fixed dimensional space." @default.
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• W2068019092 date "1997-01-15" @default.
• W2068019092 modified "2023-09-30" @default.
• W2068019092 title "Separators for sphere-packings and nearest neighbor graphs" @default.
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• W2068019092 doi "https://doi.org/10.1145/256292.256294" @default.
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