Proceedings of the American Mathematical Society

ISSN 1088-6826(online) ISSN 0002-9939(print)



Statistical extensions
of some classical Tauberian theorems

Authors: J. A. Fridy and M. K. Khan
Journal: Proc. Amer. Math. Soc. 128 (2000), 2347-2355
MSC (1991): Primary 40E05
Published electronically: February 25, 2000
MathSciNet review: 1653457
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Abstract: Hardy's well-known Tauberian theorem for Cesàro means says that if the sequence $x$ satisfies $\lim Cx = L$ and $\Delta x_k = O (1/k)$, then $\lim x = L$. In this paper it is shown that the hypothesis $\lim Cx = L$ can be replaced by the weaker assumption of the statistical limit: st-lim $Cx = L$, i.e., for every $\epsilon >0$, $\lim n^{-1} | \{ k \leq n: | ( Cx)_k - L | \geq \epsilon \} | = 0$. Similarly, the ``one-sided'' Tauberian theorem of Landau and Schmidt's Tauberian theorem for the Abel method are extended by replacing $\lim Cx $ and $\lim Ax$ with st-lim $Cx$ and st-lim $Ax$, respectively. The Hardy-Littlewood Tauberian theorem for Borel summability is also extended by replacing $\lim _t (Bx)_t=L$, where $t$ is a continuous parameter, with $\lim _n (Bx)_n =L$, and further replacing it by $(B^{*})$-st-lim $B^{*} x =L$, where $B^{*}$ is the Borel matrix method.

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Additional Information

J. A. Fridy
Affiliation: Department of Mathematics and Computer Science, Kent State University, Kent, Ohio 44242

M. K. Khan
Affiliation: Department of Mathematics and Computer Science, Kent State University, Kent, Ohio 44242

Keywords: Statistical convergence, Tauberian theorems
Received by editor(s): March 5, 1998
Received by editor(s) in revised form: September 17, 1998
Published electronically: February 25, 2000
Communicated by: Albert Baernstein II
Article copyright: © Copyright 2000 American Mathematical Society