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Pointwise convergence of double Vilenkin-Fejér means. (English) Zbl 0973.42021

Summary: In this paper we prove that double Cesàro means of an integrable function on the product of bounded Vilenkin groups with respect to any double Vilenkin-type system converge to the function almost everywhere. The convergence is provided that the quotient of the indices is bounded.

MSC:

42C10 Fourier series in special orthogonal functions (Legendre polynomials, Walsh functions, etc.)
43A75 Harmonic analysis on specific compact groups
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