Arithmetic Circuits: A survey of recent results and open questions
Foundations and Trends® in Theoretical Computer Science
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It is shown that computing the coefficients of the product of two degree-$n$ polynomials over a q-element field by means of a quadratic algorithm requires at least $(3 + \frac{\scriptstyle (q - 1)^2}{\scriptstyle q^5 + (q - 1)^3})n - o(n)$ multiplications.