|
The summability of a special series by the $(C,\alpha)$ method
S. S. Agayan Computing Center, Academy of Sciences of the Armenian SSR
Abstract:
In the paper we study the problem of the summability by the $(C,\alpha)$ method of the special series
$$
f(x)\sim\sum_{n=-\infty}^{n=+\infty}c_n(x)\exp(in\mu(x)),\eqno(*)
$$
where
\begin{gather*}
c_n(x)=\frac2\pi\int_Gf(t)\exp(-in\mu(t))\frac{\sin1/2[\mu(t)-\mu(x)]}{t-x}\,dt,
\\
\mu(x)=\frac1\pi\int_E\frac{dt}{t-x}.
\end{gather*}
$E$ is some compactum on the real axis $R$ with positive Lebesgue measure and $G$ is the complement of $E$ with respect to $R$. It is shown that if the function $|f(t)|(1+|t|)^{-1}$ is integrable on $G$, then the series (*) is $(C,\alpha)$ summable at each Lebesgue point of the considered function $f$ and for any $\alpha>0$ coincides almost everywhere with $f(x)$.
Received: 11.09.1975
Citation:
S. S. Agayan, “The summability of a special series by the $(C,\alpha)$ method”, Mat. Zametki, 19:4 (1976), 481–490; Math. Notes, 19:4 (1976), 295–300
Linking options:
https://www.mathnet.ru/eng/mzm7766 https://www.mathnet.ru/eng/mzm/v19/i4/p481
|
Statistics & downloads: |
Abstract page: | 200 | Full-text PDF : | 67 | First page: | 1 |
|