A lower bound for integer multiplication on randomized ordered read-once branching programs

  • Authors:
  • Farid Ablayev;Marek Karpinski

  • Affiliations:
  • Max-Planck Institute for Mathematics Bonn, Germany;Department of Computer Science, University of Bonn, Germany

  • Venue:
  • Information and Computation
  • Year:
  • 2003

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Abstract

We prove an exponential lower bound 2Ω(n/log n) on the size of any randomized ordered read-once branching program computing integer multiplication. Our proof depends on proving a new lower bound on Yao's randomized one-way communication complexity of certain Boolean functions. It generalizes to some other models of randomized branching programs. In contrast, we prove that testing integer multiplication, contrary even to a nondeterministic situation, can be computed by randomized ordered read-once branching program in polynomial size. It is also known that computing the latter problem with deterministic read-once branching programs is as hard as factoring integers.