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• W3204259261 abstract "We study the complexity of representing polynomials by arithmetic circuits in both the commutative and the non-commutative settings. Our approach goes through a precise understanding of the more restricted setting where multiplication is not associative, meaning that we distinguish (xy)z from x(yz). Our first and main conceptual result is a characterization result: We show that the size of the smallest circuit computing a given non-associative polynomial is exactly the rank of a matrix constructed from the polynomial and called the Hankel matrix. This result applies to the class of all circuits in both commutative and non-commutative settings, and can be seen as an extension of the seminal result of Nisan giving a similar characterization for non-commutative algebraic branching programs. The study of the Hankel matrix provides a unifying approach for proving lower bounds for polynomials in the (classical) associative setting. Our key technical contribution is to provide generic lower bound theorems based on analyzing and decomposing the Hankel matrix. We obtain significant improvements on lower bounds for circuits with many parse trees, in both (associative) commutative and non-commutative settings, as well as alternative proofs of recent results proving superpolynomial and exponential lower bounds for different classes of circuits as corollaries of our characterization and decomposition results." @default.
• W3204259261 created "2021-10-11" @default.
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• W3204259261 date "2021-10-08" @default.
• W3204259261 modified "2023-10-11" @default.
• W3204259261 title "Lower Bounds for Arithmetic Circuits via the Hankel Matrix" @default.
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• W3204259261 doi "https://doi.org/10.1007/s00037-021-00214-1" @default.
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