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This book is a classic, highly respected text that approaches Fourier series and integrals from a rigorous, historical, and often unconventional angle. Unlike standard engineering treatments, Körner emphasizes mathematical proofs, counterexamples, and the fascinating historical struggles (e.g., the convergence of Fourier series, the discovery of Gibbs phenomenon, the work of Dirichlet, Fejér, and Lebesgue). fourier analysis t w korner pdf
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