Some Exact Complexity Results for Straight-Line Computations over Semirings
Journal of the ACM (JACM)
Depth-3 arithmetic circuits over fields of characteristic zero
Computational Complexity
Elusive functions and lower bounds for arithmetic circuits
STOC '08 Proceedings of the fortieth annual ACM symposium on Theory of computing
Arithmetic Circuits: A survey of recent results and open questions
Foundations and Trends® in Theoretical Computer Science
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We prove a separation between monotone and general arithmetic formulas for polynomials of constant degree. We give an example of a polynomial C in n variables and degree k which is computable by a homogeneous arithmetic formula of size O(k^2n^2), but every monotone formula computing C requires size (n/k^c)^@W^(^l^o^g^k^), with c@?(0,1). Since the upper bound is achieved by a homogeneous arithmetic formula, we also obtain a separation between monotone and homogeneous formulas, for polynomials of constant degree.