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Part of the book series: Mathematics and Its Applications ((MAEE,volume 53))

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Abstract

Some preliminaries. Theorem 1. If p > 1, a n ≥ 0, and A n = a 1 + a 2 +... + a n, then

$${\sum\limits_1^\infty {\left( {\frac{{{A_n}}}{n}} \right)} ^p} < {\left( {\frac{p}{{p - 1}}} \right)^p}\sum\limits_1^\infty {a_n^p} ,$$
(1.1)

unless all the a are zero. The constant \({\left( {\frac{p}{{p - 1}}} \right)^p}\) is the best possible.

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Mitrinović, D.S., Pečarić, J.E., Fink, A.M. (1991). Hardy’s, Carleman’s and Related Inequalities. In: Inequalities Involving Functions and Their Integrals and Derivatives. Mathematics and Its Applications, vol 53. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3562-7_4

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