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 |