A brief introduction to Fourier transform and Fourier series in both continuous and discrete case.
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The Fast Fourier Transform
简要介绍Abel群上的Fourier变换，以此为基础给出FFT的基本思想。
A brief introduction to Fourier transform and Fourier series in both continuous and discrete case.
简要介绍Abel群上的Fourier变换，以此为基础给出FFT的基本思想。