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41-XX - Approximations and expansions [MSC 2020] |
41A15 - Spline approximation [MSC 2020] |
41A35 - Approximation by operators (in particular, by integral operators) [MSC 2020] |
41A40 - Saturation in approximation theory [MSC 2020] |
42-XX - Harmonic analysis on Euclidean spaces [MSC 2020] |
42A10 - Trigonometric approximation [MSC 2020] |
42A16 - Fourier coefficients, Fourier series of functions with special properties, special Fourier series [MSC 2020] |
42A38 - Fourier and Fourier-Stieltjes transforms and other transforms of Fourier type [MSC 2020] |