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  • 标题:Starlikeness associated with parabolic regions
  • 本地全文:下载
  • 作者:Rosihan M. Ali
  • 期刊名称:International Journal of Mathematics and Mathematical Sciences
  • 印刷版ISSN:0161-1712
  • 电子版ISSN:1687-0425
  • 出版年度:2005
  • 卷号:2005
  • 期号:4
  • 页码:561-570
  • DOI:10.1155/IJMMS.2005.561
  • 出版社:Hindawi Publishing Corporation
  • 摘要:

    A parabolic starlike function f of order ρ in the unit disk is characterized by the fact that the quantity z f ′ ( z ) / f ( z ) lies in a given parabolic region in the right half-plane. Denote the class of such functions by PS ∗ ( ρ ) . This class is contained in the larger class of starlike functions of order ρ . Subordination results for PS ∗ ( ρ ) are established, which yield sharp growth, covering, and distortion theorems. Sharp bounds for the first four coefficients are also obtained. There exist different extremal functions for these coefficient problems. Additionally, we obtain a sharp estimate for the Fekete-Szegö coefficient functional and investigate convolution properties for PS ∗ ( ρ ) .

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