Best approximations for classes of periodic functions of many variables with bounded dominating mixed derivative
UDC 517.51 We establish exact order estimates for approximations of the Sobolev classes $W^{\boldsymbol{r}}_{p,\boldsymbol{\alpha}}(\mathbb{T}^d)$ of periodic functions of many variables with bounded dominant mixed derivative. The approximation is performed by using trigonometric polyno...
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| Date: | 2024 |
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| Main Authors: | , , , , , |
| Format: | Article |
| Language: | Ukrainian |
| Published: |
Institute of Mathematics, NAS of Ukraine
2024
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| Online Access: | https://umj.imath.kiev.ua/index.php/umj/article/view/8307 |
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| Journal Title: | Ukrains’kyi Matematychnyi Zhurnal |
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Ukrains’kyi Matematychnyi Zhurnal| Summary: | UDC 517.51
We establish exact order estimates for approximations of the Sobolev classes $W^{\boldsymbol{r}}_{p,\boldsymbol{\alpha}}(\mathbb{T}^d)$ of periodic functions of many variables with bounded dominant mixed derivative. The approximation is performed by using trigonometric polynomials with  spectra in step hyperbolic crosses, and the error is estimated in the metric of the space $B_{q,1}(\mathbb{T}^d),$ $1 \leq p, q < \infty.$ |
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| DOI: | 10.3842/umzh.v76i7.8307 |