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Informally, an algorithm is a set of explicit instructions used to solve a problem (e.g. Euclid's algorithm for computing the greatest common divisor of two integers). For more specific questions on algorithms, this tag may be used in conjunction with the approximation-algorithms, algorithmic-randomness and algorithmic-topology tags.

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Is this FFT algorithm known?

R1, R2, sqrtw) # This prints[3, 10, 22, 40, 43, 38, 24] print(multiply([1,2,3,4,0,0,0,0], [3,4,5,6,0,0,0,0], 1j + 100)) This algorithm is similar to Cooley-Tukey FFT based polynomial multiplication algorithms