Lower bounds for linear degeneracy testing

  • Authors:
  • Nir Ailon;Bernard Chazelle

  • Affiliations:
  • Princeton University, Princeton, New Jersey;Princeton University, Princeton, New Jersey

  • Venue:
  • Journal of the ACM (JACM)
  • Year:
  • 2005

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Abstract

In the late nineties, Erickson proved a remarkable lower bound on the decision tree complexity of one of the central problems of computational geometry: given n numbers, do any r of them add up to 0? His lower bound of Ω(n⌈r/2⌉), for any fixed r, is optimal if the polynomials at the nodes are linear and at most r-variate. We generalize his bound to s-variate polynomials for s r. Erickson's bound decays quickly as r grows and never reaches above pseudo-polynomial: we provide an exponential improvement. Our arguments are based on three ideas: (i) a geometrization of Erickson's proof technique; (ii) the use of error-correcting codes; and (iii) a tensor product construction for permutation matrices.