
doi: 10.1007/bf02059385
Пусть {λ n 1 t8 — монотонн ая последовательнос ть натуральных чисел. Дл я каждой функции feL(0, 2π) с рядом Фурье строятся обобщенные средние Bалле Пуссена $$V_n^{(\lambda )} (f;x) = \frac{{a_0 }}{2} + \mathop \sum \limits_{k = 1}^n (a_k \cos kx + b_k \sin kx) + \mathop \sum \limits_{k = n + 1}^{n + \lambda _n } \left( {1 - \frac{{k - n}}{{\lambda _n + 1}}} \right)\left( {a_k \cos kx + b_k \sin kx} \right).$$ Доказываются следую щие теоремы. 1. Если λn=o(n), то существуе т функция feL(0, 2π), для кот орой последовательность {Vn (λ)(ƒ;x)} расходится почти вс юду. 2. Если λn=o(n), то существуе т функция feL(0, 2π), для кот орой последовательность $$\left\{ {\frac{1}{\pi }\mathop \smallint \limits_{ - \pi /\lambda _n }^{\pi /\lambda _n } f(x + t)\frac{{\sin (n + \tfrac{1}{2})t}}{{2\sin \tfrac{1}{2}t}}dt} \right\}$$ расходится почти всю ду .
Special methods of summability, Summability and absolute summability of Fourier and trigonometric series, de la Vallee Poussin means
Special methods of summability, Summability and absolute summability of Fourier and trigonometric series, de la Vallee Poussin means
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