Improved Separations between Nondeterministic and Randomized Multiparty Communication

  • Authors:
  • Matei David;Toniann Pitassi;Emanuele Viola

  • Affiliations:
  • University of Toronto;University of Toronto;Northeastern University

  • Venue:
  • ACM Transactions on Computation Theory (TOCT)
  • Year:
  • 2009

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Abstract

We exhibit an explicit function f : {0, 1}n →{0, 1} that can be computed by a nondeterministic number-on-forehead protocol communicating O(logn) bits, but that requires nΩ(1) bits of communication for randomized number-on-forehead protocols with k = δ·logn players, for any fixed δ k n. We also show that for any k = A ·loglogn the above function f is computable by a small circuit whose depth is constant whenever A is a (possibly large) constant. Recent results again give such functions but only when the number of players is k n.