Fast Fourier transform

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Invented by James W. Cooley and John W. Tukey in 1965 (Ref 1). The fast Fourier transform reduces the number of operations from $N^{2}$ to $N\ln N$ .

References

James W. Cooley and John W. Tukey", "An Algorithm for the Machine Calculation of Complex Fourier Series", Mathematics of Computation 19 pp. 297-301 (1965)

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Mathematics