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On strong approximation of Fourier series

Periodica Mathematica Hungarica
Volume/Issue:
Volume 1: Issue 2
DOI:
https://doi.org/10.1007/bf02029173
Author:
L. Leindler
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A note on the relation between ordinary and strong approximation of orthogonal series

Acta Mathematica Hungarica
Volume/Issue:
Volume 63: Issue 4
DOI:
https://doi.org/10.1007/bf01874461
Author:
L. Leindler
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On extensions of some theorems of Flett. I

Acta Mathematica Hungarica
Volume/Issue:
Volume 64: Issue 3
DOI:
https://doi.org/10.1007/bf01874254
Author:
L. Leindler
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On extensions of some theorems of Flett. II

Acta Mathematica Hungarica
Volume/Issue:
Volume 64: Issue 4
DOI:
https://doi.org/10.1007/bf01874698
Author:
L. Leindler
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General results on strong approximation by Cesàro means of negative order

Acta Mathematica Hungarica
Volume/Issue:
Volume 66: Issue 1-2
DOI:
https://doi.org/10.1007/bf01874354
Author:
L. Leindler
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On the newly generalized absolute Cesàro summability of orthogonal series

Acta Mathematica Hungarica
Volume/Issue:
Volume 68: Issue 4
DOI:
https://doi.org/10.1007/bf01874347
Author:
L. Leindler
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New sequels of a problem of Alexits

Acta Mathematica Hungarica
Volume/Issue:
Volume 35: Issue 1-2
DOI:
https://doi.org/10.1007/bf01896830
Author:
L. Leindler
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On the strong summability and approximation of orthogonal series

Acta Mathematica Hungarica
Volume/Issue:
Volume 37: Issue 1-3
DOI:
https://doi.org/10.1007/bf01904886
Author:
L. Leindler
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Derivative functions and strong approximation of Fourier series

Acta Mathematica Hungarica
Volume/Issue:
Volume 36: Issue 1-2
DOI:
https://doi.org/10.1007/bf01897112
Author:
L. Leindler
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Еще один новый класс числовых последовательностей и его приложения к синус- и косинус-рядам

Analysis Mathematica
Volume/Issue:
Volume 33: Issue 1
DOI:
https://doi.org/10.1007/s10474-007-0103-4
Author:
L. Leindler

<a name="abs1"/>Abstract??We prove three theorems for sequences of ? group bounded variation, which are analogues of the theorems proved earlier for monotone, or quasi-monotone sequences, or sequences of rest bounded variation.

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