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Symmetric convergence of double series whose coefficients are the quotients of divisions of complex Fourier coefficients by their indexes

  • Omar Dzagnidze EMAIL logo
Published/Copyright: October 12, 2017
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Abstract

The symmetric and uniform convergence of the series

|m|1,|n|11mnFmneimx,|m|1,|n|11mnFmneinyand|m|1,|n|11mnFmnei(mx+ny)

on [0,2π] and [0,2π]2 is established. These series are related to the exponential Fourier series

F00+|m|1Fm0eimx+|n|1F0neiny+|m|1,|n|1Fmnei(mx+ny)

of a function f which is summable on [0,2π]2 and 2π-periodic with respect to each variable. The necessary and sufficient conditions on a function f for the integral 0x0yf(t,τ)𝑑t𝑑τ to be 2π-periodic with respect to the variables x and y are found.

MSC 2010: 42B05

Award Identifier / Grant number: FR/223/5-100/13

Funding statement: This research was supported by Shota Rustaveli National Science Foundation Grant No. FR/223/5-100/13.

References

[1] C.-J. de la Vallée Poissin, Course d’Analyse Infinitésimale. II, GTTI, Leningrad, 1933. Search in Google Scholar

[2] O. Dzagnidze, On the behaviour of series, obtained by termwise integration of double trigonometric series, Proc. A. Razmadze Math. Inst. 166 (2014), 31–48. Search in Google Scholar

Received: 2015-4-16
Accepted: 2015-10-10
Published Online: 2017-10-12
Published in Print: 2017-12-1

© 2017 Walter de Gruyter GmbH, Berlin/Boston

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