Coefficient Estimates for Inverses of Starlike Functions of Positive Order

Details Coefficient Estimates for Inverses of Starlike Functions of Positive Order Coefficient Estimates for Inverses of Starlike Functions of Positive Order

2005-11-03

arxiv.org/abs/math/0511076v1

Mathematics

Complex Variables

12 pages

Scientific paper

In the present paper, the coefficient estimates are found for the class $\mathcal S^{*-1}(\alpha)$ consisting of inverses of functions in the class of univalent starlike functions of order $\alpha$ in $\mathcal D=\{z\in\mathbb C:|z|<1\}$. These estimates extend the work of {\it Krzyz, Libera and Zlotkiewicz [Ann. Univ. Marie Curie-Sklodowska, 33(1979), 103-109]} who found sharp estimates on only first two coefficients for the functions in the class $\mathcal S^{*-1}(\alpha)$. The coefficient estimates are also found for the class $\sum^{*-1}(\alpha)$, consisting of inverses of functions in the class $\sum^*(\alpha)$ of univalent starlike functions of order $\alpha$ in $\mathcal V=\{z\in\mathbb C:1<|z|<\infty\}$. The open problem of finding sharp coefficient estimates for functions in the class $\sum^*(\alpha)$ stands completely settled in the present work by our method developed here.

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