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On term by term dyadic differentiability of Walsh series

О почленном диадичес ком дифференцирован ии рядов Уолша

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Abstract

Доказана справедливость след ующего предположени я П. Л. Бутцера и Г. И. Вагнера: Если{ja j },j=1,2,... — положите льная монотонно стре мящаяся к нулю последователь ность, то ряд по системе Уолш а\(\sum\limits_{j = 0}^\infty {a_j \psi _j (x)} \) сходится для всех х и его суммаf(x) диадически ди фференцируема почти всюду, причем\(f^{[1]} (x) = \sum\limits_{j = 0}^\infty {ja_j \psi _j (x)} \) п очти всюду, гдеf [1](x) — поточечная диадическая произво днаяfв точкех.

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References

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Schipp, F. On term by term dyadic differentiability of Walsh series. Analysis Mathematica 2, 149–154 (1976). https://doi.org/10.1007/BF01911140

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