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On a generalization of Abel-Poisson’s singular integral having kernels of finite oscillation. (English) Zbl 0273.41016

MSC:

41A35 Approximation by operators (in particular, by integral operators)
42A16 Fourier coefficients, Fourier series of functions with special properties, special Fourier series
41A40 Saturation in approximation theory
31A30 Biharmonic, polyharmonic functions and equations, Poisson’s equation in two dimensions