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Divergence of the Fourier series of continuous functions with a restriction on the fractality of their graphs. (English) Zbl 1448.42010

Summary: We consider certain classes of functions with a restriction on the fractality of their graphs. Modifying Lebesgue’s example, we construct continuous functions from these classes whose Fourier series diverge at one point, i.e. the Fourier series of continuous functions from this classes do not converge everywhere.

MSC:

42A20 Convergence and absolute convergence of Fourier and trigonometric series
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References:

[1] Bari N.K., Trigonometric series, Fizmatgiz, Moscow, 1961, 936 pp. (in Russian)
[2] Salem R., Essais sur les séries trigonométriques., v. 862, Actual. Sci. et Industr., 1940 · JFM 66.0280.01
[3] Waterman D., “On converges of Fourier series of functions of generalized bounded variation”, Studia Mathematica, 44 (1972), 107-117 · Zbl 0207.06901
[4] Gridnev M. L., “About classes of functions with a restriction on the fractality of their graphs”, Proceedings of the 48th Intern. Youth School-Conf.: Modern Problems in Mathematics and its Applications (Ekaterinburg, February 5-11, 2017), CEUR-WS Proceedings, 1894, 2017, 167-3
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