Wiener amalgams, Hardy spaces and summability of Fourier series

• Autores: Ferenc Weisz
• Localización: Mathematical proceedings of the Cambridge Philosophical Society, ISSN 0305-0041, Vol. 145, Nº 2, 2008, págs. 419-442
• Idioma: inglés
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• Resumen

  • A general summability method, the so called ?-summability is considered for multi-dimensional Fourier series, where ? is in the Wiener algebra W(C,l1)(d). It is based on the use of Wiener amalgam spaces, weighted Feichtinger's algebra, Herz and Hardy spaces. Under some conditions on ?, it is proved that the maximal operator of the ?-means is bounded from the Hp Hardy space to Lp (or Hp). This implies some norm and almost everywhere convergence results for the ?-means. Large number of special cases of the ?-summation are considered.