Minimum convex partitions and maximum empty polytopes

  • Authors:
  • Adrian Dumitrescu;Sariel Har-Peled;Csaba D. Tóth

  • Affiliations:
  • Computer Science, University of Wisconsin---Milwaukee;Computer Science, University of Illinois at Urbana---Champaign;Mathematics and Statistics, Univ. of Calgary, Canada,Comp. Sci., Tufts University, Canada

  • Venue:
  • SWAT'12 Proceedings of the 13th Scandinavian conference on Algorithm Theory
  • Year:
  • 2012

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Abstract

Let S be a set of n points in d-space. A convex Steiner partition is a tiling of conv(S) with empty convex bodies. For every integer d, we show that S admits a convex Steiner partition with at most ⌈(n−1)/d⌉ tiles. This bound is the best possible for points in general position in the plane, and it is best possible apart from constant factors in every fixed dimension d≥3. We also give the first constant-factor approximation algorithm for computing a minimum Steiner convex partition of a planar point set in general position. Establishing a tight lower bound for the maximum volume of a tile in a Steiner partition of any n points in the unit cube is equivalent to a famous problem of Danzer and Rogers. It is conjectured that the volume of the largest tile is ω(1/n) in any dimension d≥2. Here we give a (1−ε)-approximation algorithm for computing the maximum volume of an empty convex body amidst n given points in the d-dimensional unit box [0,1]d.