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 for Fourier transform
From The Free On-line Dictionary of Computing (30 December 2018) :

  Fourier transform
      A technique for expressing a waveform as a
     weighted sum of sines and cosines.
     Computers generally rely on the version known as discrete
     Fourier transform.
     Named after J. B. Joseph Fourier (1768 -- 1830).
     See also wavelet, discrete cosine transform.

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