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Zbl 1132.30311
Cho, Nak Eun; Kim, Ji A.
Inclusion properties of certain subclasses of analytic functions defined by a multiplier transformation.
(English)
[J] Comput. Math. Appl. 52, No. 3-4, 323-330 (2006). ISSN 0898-1221

Summary: Let $\cal A$ denote the class of analytic functions with the normalization $f(0)=f'(0)-1=0$ in the open unit disk $\cal U$. Set $$f^s_\lambda(z)=z+\sum^\infty_{k=2}\left(\frac{k+\lambda}{1+\lambda}\right)^s z^k\quad (s\in\Bbb R; \lambda>-1; z\in\cal U),$$ and define $f^s_{\lambda,\mu}$, in terms of the Hadamard product, $$f^s_\lambda(z)* f^s_{\lambda,\mu}(z)=\frac{z}{(1-z)^\mu}\quad(\mu>0; z\in\cal U).$$ In this paper, the authors introduce several new subclasses of analytic functions defined by means of the operator $$I^s_{\lambda,\mu}:\cal A\to\cal A$$ given by $$I^s_{\lambda,\mu}f(z)=f^s_{\lambda,\mu}(z)*f(z)\quad (f\in\cal A;\ s\in\Bbb R; \lambda>-1; \mu>0).$$ Inclusion properties of these classes and the classes involving the generalized Libera integral operator are also considered.
MSC 2000:
*30C45 Special classes of univalent and multivalent functions
30C80 Maximum principle, etc. (one complex variable)

Keywords: subordination; starlike; convex; close-to-convex; multiplier transformation; Choi-Śaigo-Srivastava operator; integral operator

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