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Publication:3865020
zbMath0428.46026MaRDI QIDQ3865020
Publication date: 1979
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Sobolev spaces and other spaces of ``smooth functions, embedding theorems, trace theorems (46E35) Spline approximation (41A15) Approximation by arbitrary linear expressions (41A45)
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On the exact values of the best approximations of classes of differentiable periodic functions by splines ⋮ Estimates for \(n\)-widths of sets of smooth functions on the torus \(\mathbb{T}^d\) ⋮ Exact values of best approximations for classes of periodic functions by splines of deficiency 2 ⋮ Estimates for \(n\)-widths of multiplier operators of multiple Walsh series ⋮ Exact values of the best \((\alpha,\beta)\)-approximations for the classes of convolutions with kernels that do not increase the number of sign changes
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