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Proceedings of the American Mathematical Society

Published by the American Mathematical Society since 1950, Proceedings of the American Mathematical Society is devoted to shorter research articles in all areas of pure and applied mathematics.

ISSN 1088-6826 (online) ISSN 0002-9939 (print)

The 2020 MCQ for Proceedings of the American Mathematical Society is 0.85.

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A new proof for an inequality of Jenkins
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by George B. Leeman PDF
Proc. Amer. Math. Soc. 54 (1976), 114-116 Request permission

Abstract:

A new proof of Jenkins’ inequality \[ \operatorname {Re} ({e^{2i\theta }}{a_3} - {e^{2i\theta }}a_2^2 - \tau {e^{i\theta }}{a_2}) \leqslant 1 + \tfrac {3} {8}{\tau ^2} - \tfrac {1} {4}{\tau ^2}\log (\tau /4),\quad 0 \leqslant \tau \leqslant 4,\] for univalent functions $f(z) = z + \sum \nolimits _{n = 2}^\infty {{a_n}{z^n}}$ is presented.
References
    M. Fekete and G. Szegö, Eine Bemerkung über ungerade schlichte Funktionen, J. London Math. Soc. 8 (1933), 85-89. G. M. Goluzin, On distortion theorems and the coefficients of univalent functions, Mat. Sb. 1938, 321-330. (Russian)
  • G. M. Goluzin, Some questions of the theory of univalent functions, Trudy Mat. Inst. Steklov. 27 (1949), 111 (Russian). MR 0042510
  • James A. Jenkins, On certain coefficients of univalent functions, Analytic functions, Princeton Univ. Press, Princeton, N.J., 1960, pp. 159–194. MR 0117345
  • Edmund Landau, Über die Blochsche Konstante und zwei verwandte Weltkonstanten, Math. Z. 30 (1929), no. 1, 608–634 (German). MR 1545082, DOI 10.1007/BF01187791
  • Karl Löwner, Untersuchungen über schlichte konforme Abbildungen des Einheitskreises. I, Math. Ann. 89 (1923), no. 1-2, 103–121 (German). MR 1512136, DOI 10.1007/BF01448091
Additional Information
  • © Copyright 1976 American Mathematical Society
  • Journal: Proc. Amer. Math. Soc. 54 (1976), 114-116
  • DOI: https://doi.org/10.1090/S0002-9939-1976-0393457-2
  • MathSciNet review: 0393457