How to net a lot with little: small &egr;-nets for disks and halfspaces

  • Authors:
  • Jiří Matoušek;Raimund Seidel;E. Welzl

  • Affiliations:
  • Department of Computer Science, Charles University, Malostranské nám. 25, 118 00 Praha 1, Czechoslovakia;Computer Science Division, University of California, Berkeley, Berkeley, CA;Fachbereich Mathematik, Freie Universität Berlin, Arnimallee 2-6, D-1000 Berlin 33, West Germany

  • Venue:
  • SCG '90 Proceedings of the sixth annual symposium on Computational geometry
  • Year:
  • 1990

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Abstract

It is known that in general range spaces of VC-dimension d 1 require &egr;-nets to be of size at least &OHgr;(d/&egr; log 1/&egr;). We investigate the question whether this general lower bound is valid for the special range spaces that typically arise in computational geometry. We show that disks and pseudo-disks in the plane as well as halfspaces in R3 allow &egr;-nets of size only &Ogr;(1/&egr;), which is best possible up to a multiplicative constant. The analogous questions for higher-dimensional spaces remain open.