Vol. 83, No. 2, 1979

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On a theorem of Hayman concerning the derivative of a function of bounded characteristic

Patrick Robert Ahern

Vol. 83 (1979), No. 2, 297–301
Abstract

W. Hayman [On Nevanlinna’s second theorem and extensions, Rend. Circ. Mat. Palermo, Ser. II, II (1953).] has given sufficient conditions on a function, f, of bounded characteristic in the unit disc, in order that falso have bounded characteristic. In this paper it is shown that one of these conditions is also necessary for the conclusion of the theorem to hold.

Mathematical Subject Classification 2000
Primary: 30D50
Milestones
Received: 1 January 1979
Published: 1 August 1979
Authors
Patrick Robert Ahern
Department of Mathematics
University of Wisconsin
Madison WI
United States