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A note on Abel's partial summation formula

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arxiv 1706.08079 v2 pith:Y32SJXXS submitted 2017-06-25 math.CA

classification math.CA
keywords convergenceabelformulapartialsummationdensityinequalityseries
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abstract

Several applications of Abel's partial summation formula to the convergence of series of positive vectors are presented. For example, when the norm of the ambient ordered Banach space is associated to a strong order unit, it is shown that the convergence of the series $\sum x_{n}$ implies the convergence in density of the sequence $(nx_{n})_{n}$ to 0. This is done by extending the Koopman-von Neumann characterization of convergence in density. Also included is a new proof of the Jensen-Steffensen inequality based on Abel's partial summation formula and a trace analogue of Tomi\'{c}-Weyl inequality of submajorization.

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Cited by 2 Pith papers

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  1. Diophantine FLINT-HILLS series

    math.GM 2025-01 reject novelty 4.0 of 10

    The paper claims a proof of convergence of the Flint-Hills series and a new irrationality-measure bound mu(pi) <= 2.5, but the proof is circular and invalid.

  2. Holder continuity of an alternating Erdos series on prime K-tuples

    math.GM 2025-04 reject novelty 3.0 of 10

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