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On the approximation properties of Cesaro means of negative order of double Vilenkin-Fourier series

Author: Tsitsino Tepnadze
Keywords: Vilenkin system, Cesaro means, Convergence in norm
Annotation:

We estabilish approximation properties of Cesaro means of double Vilenkin-Fourier series. This redult allows one to obtain a condition which is necessary and sufficient for the convergence of the Cesaro means to the function in the L_p metric.



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