References
V. A. Baskakov, “A conjecture of P. P. Korovkin about irregular summability methods for Fourier series,” in:Constructive Function Theory [in Russian], Sofia (1980), pp. 25–28.
N. K. Bari,Trigonometric Series [in Russian], Fizmatgiz, Moscow (1961).
Additional information
Translated from Matematicheskie Zametki, Vol. 56, No. 6, pp. 117–121, December, 1994.
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Baskakov, V.A. Approximation with best order by Toeplitz-irregular methods of summability of Fourier series. Math Notes 56, 1291–1294 (1994). https://doi.org/10.1007/BF02266697
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DOI: https://doi.org/10.1007/BF02266697