Approximation of linear functionals on a Banach space with a Gaussian measure
Journal of Complexity
Information-based complexity
Approximation and optimization on the Wiener space
Journal of Complexity
Average error bounds of best approximation of continuous functions on the Wiener space
Journal of Complexity
Relations between classical, average, and probabilistic Kolmogorov widths
Journal of Complexity
Multivariate approximating averages
Journal of Approximation Theory
Journal of Approximation Theory
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In this paper, we discuss the best approximation of functions by spherical polynomials and the approximation by Fourier partial summation operators, Vallee-Poussin operators, Cesaro operators, and Abel operators, on the Sobolev space on the sphere with a Gaussian measure, and obtain the average error estimates. We also get the asymptotic values for the average Kolmogorov and linear widths of the Sobolev space on the sphere and show that, in the average case setting, the spherical polynomial subspaces are the asymptotically optimal subspaces in the L"q(1@?q