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We discuss the concentration factor methods for determination of jumps in terms of spectral data. The results are relative to the classical Lukács Theorem and some recent results obtained by A. Gelb, E. Tadmor and F. Móricz. §1. Introduction Set T := [−π, π). Let L(T) denote the set of all periodic and integrable functions with period 2π. For any f ∈ L(T)(More)
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