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The inclusion of certain classes of functions
N. Temirgaliev Kazakh State University
Abstract:
For any sequence $\{N_k\}$ with $\{N_k\}\downarrow0$ we find sharp theorems on the inclusion of the classes $\{f:f\in L(0,2\pi),\ E_k^{(1)}(f)=O(N_k)\}$, where $E_k^{(1)}(f)$ is the best approximation (in $L$) of $f$ by trigonometric polynomials of order no greater than $k$, in the class $L_\varphi(L)$ with slowly growing $\varphi$ and in the class $L^\nu$, $1<\nu<\infty$.
Received: 29.01.1976
Citation:
N. Temirgaliev, “The inclusion of certain classes of functions”, Mat. Zametki, 20:6 (1976), 835–841; Math. Notes, 20:6 (1976), 1026–1030
Linking options:
https://www.mathnet.ru/eng/mzm7912 https://www.mathnet.ru/eng/mzm/v20/i6/p835
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Abstract page: | 240 | Full-text PDF : | 88 | First page: | 1 |
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