We report on the inverse problem for the truncated Fourier series representation of f(x) ? BV(?l, l) in a form with a quadratic\ndegeneracy, revealing the existence of the Gibbs-Wilbraham phenomenon. A new distribution-theoretic proof is proposed for\nthis phenomenon. The paper studies moreover the iterative numerical solvability and solution of this inverse problem near\ndiscontinuities of f(x).
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