Abstract
Necessary and sufficient conditions are derived for the convergence of a trigonometric series to a function of bounded variation on the interval (α, β) ⊂[-π, π]. For the case in which the coefficients satisfy certain conditions, the continuity of the sum function is investigated.
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A. Zygmund, Trigonometric Series, Vol. 1, Cambridge Univ. Press, New York (1959).
G. Goes, “Lokale Konvergenzbedingungen für trigonometrische Reihen und für Potenzreihen,” Math. Z.,82, 389–393 (1963).
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Translated from Matematicheskie Zametki, Vol. 8, No. 1, pp. 47–58, July, 1970.
The author wishes to thank his scientific supervisor S. A. Telyakovskii for suggesting this problem and for his interest in the work.
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Oskolkov, K.I. The convergence of trigonometric series to functions of bounded variation. Mathematical Notes of the Academy of Sciences of the USSR 8, 496–503 (1970). https://doi.org/10.1007/BF01093441
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DOI: https://doi.org/10.1007/BF01093441