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Proceedings of the American Mathematical Society

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

 
 

 

Generating functions for some classes of univalent functions


Authors: Zdzisław Lewandowski, Sanford Miller and Eligiusz Złotkiewicz
Journal: Proc. Amer. Math. Soc. 56 (1976), 111-117
DOI: https://doi.org/10.1090/S0002-9939-1976-0399438-7
MathSciNet review: 0399438
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Abstract: Let $P(z) = {e^{i\beta }} + {p_1}z + {p_2}{z^2} + \cdots$ be regular in the unit disc $\Delta$ with $|\beta | < \pi /2$, and let $\psi (u,v)$ be a continuous function defined in a domain of ${\mathbf {C}} \times {\mathbf {C}}$. With some very simple restrictions on $\psi (u,v)$ the authors prove a lemma that $\operatorname {Re} \psi (p(z),zp’(z)) > 0$ implies $\operatorname {Re} p(z) > 0$. This result is then used to generate subclasses of starlike, spirallike and close-to-convex functions.


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Keywords: Functions with positive real part, Carath&#233;odory functions, univalent functions, starlike functions, spirallike functions, close-to-convex functions
Article copyright: © Copyright 1976 American Mathematical Society