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![Gabriel Peyré on Twitter: "Hadamard–Rademacher–Walsh transform is the Fourier transform on the group (Z/2Z)^n, and enjoys a N*log(N) fast transform. It is used among other thing in error correcting codes. https://t.co/ipXOKRorZ3 https://t.co/GuN2YMsGu9 Gabriel Peyré on Twitter: "Hadamard–Rademacher–Walsh transform is the Fourier transform on the group (Z/2Z)^n, and enjoys a N*log(N) fast transform. It is used among other thing in error correcting codes. https://t.co/ipXOKRorZ3 https://t.co/GuN2YMsGu9](https://pbs.twimg.com/media/DqQG_miWkAEqt4B.jpg)