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41A50 - Best approximation, Chebyshev systems [MSC 2020] |
41A25 - Rate of convergence, degree of approximation [MSC 2020] |
42A20 - Convergence and absolute convergence of Fourier and trigonometric series [MSC 2020] |
40C05 - Matrix methods for summability [MSC 2020] |
41A15 - Spline approximation [MSC 2020] |
41A45 - Approximation by arbitrary linear expressions [MSC 2020] |
42A16 - Fourier coefficients, Fourier series of functions with special properties, special Fourier series [MSC 2020] |
42A24 - Summability and absolute summability of Fourier and trigonometric series [MSC 2020] |
41A30 - Approximation by other special function classes [MSC 2020] |