Computing the largest empty convex subset of a set of points

  • Authors:
  • David Avis;David Rappaport

  • Affiliations:
  • McGill University, 805 Sherbrooke Street West, Montreal, Quebec. H3A 2K6;McGill University, 805 Sherbrooke Street West, Montreal, Quebec. H3A 2K6

  • Venue:
  • SCG '85 Proceedings of the first annual symposium on Computational geometry
  • Year:
  • 1985

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Abstract

A largest empty convex subset of a finite set of points, S, is a maximum cardinality subset of S, that (1) are the vertices of a convex polygon, and (2) contain no other points of S interior to their convex hull. An &Ogr;(n3) time and &Ogr;(n2) space algorithm is introduced to find such subsets, where n represents the cardinality of S. Empirical results are obtained and presented. In particular, a configuration of 20 points is obtained with no empty convex hexagon, giving a partial answer to a question of Paul Erdös.