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On Coefficient Means of Certain Subclasses of Univalent Functions

1973
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Transactions of the American Mathematical Society
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Let *R denote the class of regular functions whose derivatives have positive real part in the unit disc y and let S denote the class of functions starlike in y. In this paper we investigate the rates of growth of the means s"(\) = n"1 2" |a*|* (00) as n -» +oo for bounded f(z) = 2r«áz'e¿?U¿ It is proved, for example, that the estimate r"(X) = o(l)(log 7i)~°w (n -» +oo), where a(X) = X/2 for 0 < X < 2 and a(X) = 1 for X > 2, holds for such functions/, and that it is best possible for each fixed

doi:10.2307/1996431
fatcat:i2bm2cdhgvfmpju4safxo2bckm