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This article is cited in 6 scientific papers (total in 6 papers)
On the best approximation in the metric of $L$ to certain classes of functions by Haar-system polynomials
N. P. Khoroshko Dnepropetrovsk State University
Abstract:
Let $H_\omega$, $H_\omega^L$ be classes of functions $f(x)$ whose modulus of continuity $\omega(f;t)$ and, respectively, integral modulus of continuity $\omega(f;t)_L$ do not exceed a given modulus of continuity \omega(t)$, while $H_V$ is a~class of functions $f(x)$ whose variation $\mathop V\limits_0^1f$ fdoes not exceed a~given number $V>0$. Bounds are obtained for the upper limit of the best approximations in the metric of $L$ by Haar-system polynomials on the classes just introduced (on the class $H_\omega^L$ only when $\omega(t)=Kt$). These bounds are exact for class $H_V$ and, in case $\omega(t)$ is convex, also for the classes $H_\omega$ and $H\omega^L$.
Received: 05.08.1968
Citation:
N. P. Khoroshko, “On the best approximation in the metric of $L$ to certain classes of functions by Haar-system polynomials”, Mat. Zametki, 6:1 (1969), 47–54; Math. Notes, 6:1 (1969), 487–491
Linking options:
https://www.mathnet.ru/eng/mzm6896 https://www.mathnet.ru/eng/mzm/v6/i1/p47
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Abstract page: | 226 | Full-text PDF : | 97 | First page: | 1 |
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