Approximation by Marcinkiewicz ϴ-means of double Walsh-Fourier series

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• István Blahota
• Károly Nagy
• George Tephnadze

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• Primary
• 42C10

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• Walsh group
• Walsh system
• Walsh-Fourier series
• Nörlund mean
• weighted mean
• approximation
• modulus of continuity
• Lipschitz function
• ϴ-mean
• two-dimensional system
• quadratical partial sum

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