On the Approximation of Periodic Functions in L2 and the Values of the Widths of Certain Classes of Functions

The sharp Jackson–Stechkin inequalities are received, in which a special module of continuity Ωem(f;t) determined by Steklov’s function is used instead the usual modulus of continuity of mth order ωm(f;t). Such generalized modulus of continuity of mth order were introduced by V.A. Abilov and F.V. Ab...

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Главный автор: K. Tukhliev
Формат: Статья
Язык:английский
Опубликовано: Yaroslavl State University 2015-02-01
Серии:Моделирование и анализ информационных систем
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Online-ссылка:https://www.mais-journal.ru/jour/article/view/236
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Итог:The sharp Jackson–Stechkin inequalities are received, in which a special module of continuity Ωem(f;t) determined by Steklov’s function is used instead the usual modulus of continuity of mth order ωm(f;t). Such generalized modulus of continuity of mth order were introduced by V.A. Abilov and F.V. Abilova. The introduced modulus of continuity found their application in the theory of polynomial approximation in Hilbert space in the works by M.Sh. Shabozov and G.A. Yusupov, S.B. Vakarchuk and V.I. Zabutnaya and others. While continuing and developing these direction for some classes of functions defined by modulus of continuity, the new values of n-widths in the Hilbert space L₂were found.
ISSN:1818-1015
2313-5417