On defining integers in the counting hierarchy and proving arithmetic circuit lower bounds

  • Authors:
  • Peter Bürgisser

  • Affiliations:
  • Dept. of Mathematics, University of Paderborn, Paderborn, Germany

  • Venue:
  • STACS'07 Proceedings of the 24th annual conference on Theoretical aspects of computer science
  • Year:
  • 2007

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Abstract

Let τ (n) denote the minimum number of arithmetic operations sufficient to build the integer n from the constant 1.We prove that if there are arithmetic circuits for computing the permanent of n by n matrices having size polynomial in n, then τ(n!) is polynomially bounded in log n. Under the same assumption on the permanent, we conclude that the Pochhammer-Wilkinson polynomials Πk=1n (X - k) and the Taylor approximations Σk=0n 1/k! Xk and Σk=1n 1/kXk of exp and log, respectively, can be computed by arithmetic circuits of size polynomial in log n (allowing divisions). This connects several so far unrelated conjectures in algebraic complexity.