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Published online by Cambridge University Press: 20 November 2018
Let S2jf be the 2j -th partial sum of the Vilenkin-Fourier series of f ∊ L 1, and set S 2-1 f = 0. For , we show that the ratio
is contained between two bounds (independent of f) . From this we obtain the Marcinkiewicz multiplier theorem for Vilenkin-Fourier series.