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A note on cosine series with coefficients of generalized bounded variation

  • Bhikha Lila Ghodadra EMAIL logo and Vanda Fülöp
Published/Copyright: May 23, 2020
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Abstract

In this note, we obtain a Tauberian theorem for a class of regular lower triangular matrices operating on cosine series with coefficients tending to zero. As corollaries we obtain Tauberian theorems for weighted mean, Nörlund, and Hausdorff matrices.


This research was completed while the first author was under a visit of Bolyai Institute, University of Szeged, Szeged, Hungary, under the Hungarian State Scholarship Grant Award during the academic year 2016–2017 between May 16, 2017 to June 15, 2017. For the second author Ministry of Human Capacities, Hungary grant 20391-3/2018/FEKUSTRAT is acknowledged and the research was supported also by the Nemzeti Kutatási Fejlesztési és Innovációs Hivatal’ NKFIH, Grant No. K115383.


  1. Communicated by Tomasz Natkaniec

References

[1] Edwards, R. E.: Fourier Series, A Modern Introduction, Volume 1, Second Edition, Springer-Verlag, New York, Heidelberg, Berlin, 1979.10.1007/978-1-4612-6208-4Search in Google Scholar

[2] Rhoades, B. E.: Hausdorff summability methods, Trans. Am. Math. Soc. 101 (1961), 396–425.10.1090/S0002-9947-1961-0136897-2Search in Google Scholar

[3] Rhoades, B. E.: Walsh-Fourier series with coefficients of generalized bounded variation, Acta Sci. Math. 74 (2008), 609–614.Search in Google Scholar

[4] Zygmund, A.: Trigonometric Series, Third Edition, Vol. I and II combined. With a foreword by R. A. Fefferman, Cambridge University Press, 2002.10.1017/CBO9781316036587Search in Google Scholar

Received: 2019-05-01
Accepted: 2019-11-21
Published Online: 2020-05-23
Published in Print: 2020-06-25

© 2020 Mathematical Institute Slovak Academy of Sciences

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