Abstract
The purpose of this work is to prove an analog of the classical Titchmarsh’s theorem (Introduction to the theory of Fourier integrals, Oxford University Press, Oxford, 1937, Theorem 84) and Younis’s Theorem (Fourier transform of Lipschitz functions on compact groups, Ph.D. Thesis, McMaster University, Hamilton, Ontario, Canada, 1974, Theorem 2.6) on the image under the discrete Fourier–Jacobi transform of a set of functions satisfying a generalized Lipschitz condition in the weighted spaces \({\mathbb {L}}_{p}([0,\pi ]) \), \(1<p\le 2\). For this purpose, we use a generalized translation operator which was defined by Flensted-Jensen and Koornwinder in (The convolution structure for Jacobi function expansions, Ark. Mat., 1973)
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The authors are grateful to the referees for the useful comments and suggestions in improving the presentation of the paper.
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Daher, R., Tyr, O. Weighted approximation for the generalized discrete Fourier–Jacobi transform on space \(L_{p}({\mathbb {T}})\). J. Pseudo-Differ. Oper. Appl. 11, 1685–1697 (2020). https://doi.org/10.1007/s11868-020-00368-6
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DOI: https://doi.org/10.1007/s11868-020-00368-6
Keywords
- Fourier–Jacobi expansion
- Fourier–Jacobi transform
- Generalized translation operator
- Lipschitz class
- Titchmarsh theorem