3.5 Finite Differences Fast Poisson Solvers

2. Fast Poisson Solver (applying the FFT = Fast Fourier Transform) 3. Odd-Even Reduction (since K2D is block tridiagonal). The novelty is in the Fast Poisson Solver, which uses the known eigenvalues and eigenvectors of K and K2D. It is strange to solve linear equations KU = F by ................
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