Yıl: 2021 Cilt: 4 Sayı: 2 Sayfa Aralığı: 179 - 185 Metin Dili: İngilizce İndeks Tarihi: 29-07-2022

Unrestricted Cesàro summability of d-dimensional Fourier series and Lebesgue points

Öz:
We generalize the classical Lebesgue’s theorem to multi-dimensional functions. We prove that theCesàro means of the Fourier series of the multi-dimensional function f ∈ L1(log L)d−1(Td) ⊃ Lp(Td) (1 < p ≤ ∞)converge to f at each strong Lebesgue point.
Anahtar Kelime:

Belge Türü: Makale Makale Türü: Araştırma Makalesi Erişim Türü: Erişime Açık
  • [1] S. Y. A. Chang, R. Fefferman: Some recent developments in Fourier analysis and Hp-theory on product domains, Bull. Amer. Math. Soc., 12 (1985), 1–43.
  • [2] H. G. Feichtinger, F. Weisz: Wiener amalgams and pointwise summability of Fourier transforms and Fourier series, Math. Proc. Cambridge Philos. Soc., 140 (2006), 509–536.
  • [3] L. Fejér: Untersuchungen über Fouriersche Reihen, Math. Ann., 58 (1904), 51–69.
  • [4] G. Gát: Pointwise convergence of cone-like restricted two-dimensional (C, 1) means of trigonometric Fourier series, J. Approx. Theory., 149 (2007), 74–102.
  • [5] G. Gát: Almost everywhere convergence of sequences of Cesàro and Riesz means of integrable functions with respect to the multidimensional Walsh system, Acta Math. Sin., 30 (2) (2014), 311–322.
  • [6] G. Gát, U. Goginava and K. Nagy: On the Marcinkiewicz-Fejér means of double Fourier series with respect to WalshKaczmarz system, Studia Sci. Math. Hungar., 46 (2009), 399–421.
  • [7] U. Goginava: Marcinkiewicz-Fejér means of d-dimensional Walsh-Fourier series, J. Math. Anal. Appl., 307 (2005), 206– 218.
  • [8] U. Goginava: Almost everywhere convergence of (C, α)-means of cubical partial sums of d-dimensional Walsh-Fourier series, J. Approx. Theory, 141 (2006), 8–28.
  • [9] U. Goginava: The maximal operator of the Marcinkiewicz-Fejér means of d-dimensional Walsh-Fourier series, East J. Approx., 12 (2006), 295–302.
  • [10] B. Jessen, J. Marcinkiewicz and A. Zygmund: Note on the differentiability of multiple integrals, Fundam. Math., 25 (1935), 217–234.
  • [11] H. Lebesgue: Recherches sur la convergence des séries de Fourier, Math. Ann., 61 (1905), 251–280.
  • [12] J. Marcinkiewicz, A. Zygmund: On the summability of double Fourier series, Fund. Math., 32 (1939), 122–132.
  • [13] K. Nagy, G. Tephnadze: The Walsh-Kaczmarz-Marcinkiewicz means and Hardy spaces, Acta Math. Hungar., 149 (2016), 346–374.
  • [14] L. E. Persson, G. Tephnadze and P. Wall: Maximal operators of Vilenkin-Nörlund means, J. Fourier Anal. Appl., 21 (1) (2015), 76–94.
  • [15] M. Riesz: Sur la sommation des séries de Fourier, Acta Sci. Math. (Szeged), 1 (1923), 104–113.
  • [16] S. Saks: Remark on the differentiability of the Lebesgue indefinite integral, Fundam. Math., 22 (1934) 257–261.
  • [17] P. Simon: Cesàro summability with respect to two-parameter Walsh systems, Monatsh. Math., 131 (2000), 321–334.
  • [18] P. Simon: (C, α) summability of Walsh-Kaczmarz-Fourier series, J. Approx. Theory, 127 (2004), 39–60.
  • [19] F. Weisz: Summability of Multi-dimensional Fourier Series and Hardy Spaces, Mathematics and Its Applications, Kluwer Academic Publishers, Dordrecht, Boston, London, (2002).
  • [20] F. Weisz: Summability of multi-dimensional trigonometric Fourier series, Surv. Approx. Theory, 7 (2012), 1–179, .
  • [21] A. Zygmund: Trigonometric Series. Cambridge Press, London, 3rd edition, (2002).
APA Weisz F (2021). Unrestricted Cesàro summability of d-dimensional Fourier series and Lebesgue points. , 179 - 185.
Chicago Weisz Ferenc Unrestricted Cesàro summability of d-dimensional Fourier series and Lebesgue points. (2021): 179 - 185.
MLA Weisz Ferenc Unrestricted Cesàro summability of d-dimensional Fourier series and Lebesgue points. , 2021, ss.179 - 185.
AMA Weisz F Unrestricted Cesàro summability of d-dimensional Fourier series and Lebesgue points. . 2021; 179 - 185.
Vancouver Weisz F Unrestricted Cesàro summability of d-dimensional Fourier series and Lebesgue points. . 2021; 179 - 185.
IEEE Weisz F "Unrestricted Cesàro summability of d-dimensional Fourier series and Lebesgue points." , ss.179 - 185, 2021.
ISNAD Weisz, Ferenc. "Unrestricted Cesàro summability of d-dimensional Fourier series and Lebesgue points". (2021), 179-185.
APA Weisz F (2021). Unrestricted Cesàro summability of d-dimensional Fourier series and Lebesgue points. Constructive mathematical analysis (Online), 4(2), 179 - 185.
Chicago Weisz Ferenc Unrestricted Cesàro summability of d-dimensional Fourier series and Lebesgue points. Constructive mathematical analysis (Online) 4, no.2 (2021): 179 - 185.
MLA Weisz Ferenc Unrestricted Cesàro summability of d-dimensional Fourier series and Lebesgue points. Constructive mathematical analysis (Online), vol.4, no.2, 2021, ss.179 - 185.
AMA Weisz F Unrestricted Cesàro summability of d-dimensional Fourier series and Lebesgue points. Constructive mathematical analysis (Online). 2021; 4(2): 179 - 185.
Vancouver Weisz F Unrestricted Cesàro summability of d-dimensional Fourier series and Lebesgue points. Constructive mathematical analysis (Online). 2021; 4(2): 179 - 185.
IEEE Weisz F "Unrestricted Cesàro summability of d-dimensional Fourier series and Lebesgue points." Constructive mathematical analysis (Online), 4, ss.179 - 185, 2021.
ISNAD Weisz, Ferenc. "Unrestricted Cesàro summability of d-dimensional Fourier series and Lebesgue points". Constructive mathematical analysis (Online) 4/2 (2021), 179-185.