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b_b  ·  4725 days ago  ·  link  ·    ·  parent  ·  post: A faster fast Fourier transform
FTs and perhaps moreso the related Fourier series blew my mind as well. To think that any arbitrary function can be represented as the sum of a weighted series of periodic functions was not something I had considered (and why would I? its not exactly obvious), but after I felt like I had discovered some kind of deeper truth.