Some note about Fourier spectral method (unbounded grid and periodic grid).
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Green's Function of Potential Equation
Some note about Green’s function.
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Fourier Transform And Fourier Series
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。