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Hilbert's Double Series Theorem's Extensions via the Mathieu Series Approach

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The author’s research devoted to the Hilbert’s double series theorem and its various further extensions are the focus of a recent survey article. The sharp version of double series inequality… Click to show full abstract

The author’s research devoted to the Hilbert’s double series theorem and its various further extensions are the focus of a recent survey article. The sharp version of double series inequality result is extended in the case of a not exhaustively investigated non-homogeneous kernel, which mutually covers the homogeneous kernel cases as well. Particularly, novel Hilbert’s double series inequality results are presented, which include the upper bounds built exclusively with non-weighted ℓp–norms. The main mathematical tools are the integral expression of Mathieu (a, λ)-series, the Hölder inequality and a generalization of the double series theorem by Yang.

Keywords: series theorem; double series; series; mathieu series; hilbert double

Journal Title: Axioms
Year Published: 2022

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