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  • 标题:An application of a subordination chain
  • 本地全文:下载
  • 作者:Sukhjit Singh ; Sushma Gupta
  • 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:2003
  • 卷号:2003
  • 期号:28
  • 页码:1751-1754
  • DOI:10.1155/S0161171203204087
  • 出版社:Hindawi Publishing Corporation
  • 摘要:

    Let K denote the class of functions g ( z ) = z + a 2 z 2 + ⋯ which are regular and univalently convex in the unit disc E . In the present note, we prove that if f is regular in E , f ( 0 ) = 0 , then for g ∈ K , f ( z ) + α z f ′ ( z )   ≺   g ( z ) + α z g ′ ( z ) in E implies that f ( z ) ≺ g ( z ) in E , where 0$"> α > 0 is a real number and the symbol “ ≺ ” stands for subordination.

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