Abstract
It is proved that if a series is absolute summable by a Cesàro (C,α) method, then it is summable (C,β) for anyβ, such that Reα = Reβ>−1.
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S. Baron, Introduction to the Theory of Summability of Series [in Russian], Tartu (1966).
I. I. Volkov, “The (C,α) summation of divergent series,” Trudy Mosk. In-ta Mekhanizatsii i Élektrifikatsii s. kh.,4, No. 1, 137–146 (1959).
I. I. Volkov, “Summability sets for Cesàro methods of complex order,” Uspekhi Matem. Nauk,17, No. 1, 161–168 (1962).
A. Zygmund, Trigonometric Series, Vol. 1, Cambridge University Press (1959).
H. Hahn, “Über Folgen Linearer Operationen,” Monatsh. Math. und Phys.,32, 3–88 (1922).
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Translated from Matematicheskie Zametki, Vol. 9, No. 1, pp. 13–18, January, 1971.
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Volkov, I.I. Relation between summability and absolute summability by Cesaro means of complex order. Mathematical Notes of the Academy of Sciences of the USSR 9, 9–11 (1971). https://doi.org/10.1007/BF01405042
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DOI: https://doi.org/10.1007/BF01405042