On the approximation properties of Cesàro means of negative order of double Vilenkin – Fourier series
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UDC 517.5 We establish approximation properties of Ces\`{a}ro means with α , β ϵ ( 0,1 ) of Vilenkin\,--\,Fourier series. This result allows one to obtain a condition which is sufficient for the convergence of the means σ n , m - α , - β ( x , y , f ) to f ( x , y ) in the L p -metric.
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