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Re:An animated introduction to the Fourier Transform [video] by adamnemecek on Sunday January 28, 2018 @04:28AM (#16250566)
I’ll just leave this here

http://tomlr.free.fr/Math%E9matiques/Math%20Complete/Analysi...

Mathematics of the discrete Fourier Transform by Julius O. Smith. (O stands for Orange I hope)

Re:An animated introduction to the Fourier Transform [video] by jacobolus on Sunday January 28, 2018 @06:25AM (#16250836)