The average-case area of Heilbronn-type triangles

  • Authors:
  • Tao Jiang;Ming Li;Paul Vitányi

  • Affiliations:
  • Department of Computer Science, University of California, Riverside, CA;Department of Computer Science, University of California, Santa Barbara, CA;CWI, Kruislaan 413, 1098 SJ Amsterdam, The Netherlands

  • Venue:
  • Random Structures & Algorithms
  • Year:
  • 2002

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Abstract

From among ??? triangles with vertices chosen from n points in the unit square, let T be the one with the smallest area, and let A be the area of T. Heilbronn's triangle problem asks for the maximum value assumed by A over all choices of n points. We consider the average-case: If the n points are chosen independently and at random (with a uniform distribution), then there exist positive constants c and C such that c/n3 µn C/n3 for all large enough values of n, where µn is the expectation of A. Moreover, c/n3 A C/n3, with probability close to one. Our proof uses the incompressibility method based on Kolmogorov complexity; it actually determines the area of the smallest triangle for an arrangement in "general position."