Product-structured convolutions over a domain of size N can be computed in O(N^{2ω/3}) ≈ O(N^{1.582}) arithmetic operations, where ω is the matrix multiplication exponent.
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Faster Convolutions: Yates and Strassen Revisited
Product-structured convolutions over a domain of size N can be computed in O(N^{2ω/3}) ≈ O(N^{1.582}) arithmetic operations, where ω is the matrix multiplication exponent.