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Dal'nevostochnyi Matematicheskii Zhurnal, 2000, Volume 1, Number 1, Pages 16–27 (Mi dvmg74)  

Criterion of square summability with geometric weight for Jacobi expansions

D. B. Karp

Institute of Applied Mathematics, Far-Eastern Branch of the Russian Academy of Sciences
References:
Abstract: In this paper we prove that $\sum_{k=0}^{\infty}|f_k|^2\theta^k<\infty$, where $\theta>1$ and $f_k$ is the k-th Fourier coefficient of a function $f\in{L_1(-1,1;(1-x)^{\lambda}(1+x)^{\mu})}$ in orthonormal Jacobi polynomials, iff $f$ can be analytically continued to the ellipse $E_{\theta}=\{z:~|z-1|+|z+1|<\theta^{\frac{1}{2}}+ \theta^{-\frac{1}{2}}\}$ and its analytic continuation belongs to the Szegö space $AL_2(\partial{E_{\theta}})$.
Received: 11.05.2000
Document Type: Article
UDC: 517.538, 517.587
MSC: Primary 33C45; Secondary 42C05
Language: Russian
Citation: D. B. Karp, “Criterion of square summability with geometric weight for Jacobi expansions”, Dal'nevost. Mat. Zh., 1:1 (2000), 16–27
Citation in format AMSBIB
\Bibitem{Kar00}
\by D.~B.~Karp
\paper Criterion of square summability with geometric weight for Jacobi expansions
\jour Dal'nevost. Mat. Zh.
\yr 2000
\vol 1
\issue 1
\pages 16--27
\mathnet{http://mi.mathnet.ru/dvmg74}
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