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Annals of Mathematics
Article . 1939 . Peer-reviewed
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On Certain Power Series Having Infinitely Many Zero Coefficients

On certain power series having infinitely many zero coefficients
Authors: Robertson, M. S.;

On Certain Power Series Having Infinitely Many Zero Coefficients

Abstract

ian I _ n for all n is known (3). This fact was obtained by showing it to be also true for the larger class of analytic functions called by W. Rogosinski (4) typically-real functions, that is, those functions f(z) which assume real values for, and only for, real values of z when z lies within the unit circle. However, for the class of odd typically-real functions the coefficients are not bounded, though they are bounded for odd univalent functions, a sub-class when the coefficients are real. The following example illustrates the unboundedness of the coefficients of an odd typically-real function: z)=Z+ z2 ___ + (1.2) (1 _ Z2)2 2 (1 _ Z2)2 (1 + z)21

Keywords

Complex functions

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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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impulse
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