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Duality for hadamard products applied to certain integral transforms*

 

作者: S. Ponnusamy,   F. Rønning,  

 

期刊: Complex Variables, Theory and Application: An International Journal  (Taylor Available online 1997)
卷期: Volume 32, issue 3  

页码: 263-287

 

ISSN:0278-1077

 

年代: 1997

 

DOI:10.1080/17476939708814995

 

出版商: Gordon and Breach Science Publishers

 

关键词: Starlike functions;Integral transforms;Hadamard product;30C45;33C05

 

数据来源: Taylor

 

摘要:

LetA1be the class of functions analytic in the unit disk and normalized byf(0)=f′–1=0. We shall investigate the integral transformwhere λ is a non-negative real valued function normalized byFrom our main results we get conditions on the number β and the function λ such thatVλ(f) is starlike of order γ(0 ≤ γ ≤ 1/2) whenfhas the property that Re[eiα(f′(z)–β)]> 0. We also find conditions implying thatF=Vλ(f) satisfies the starlikeness condition. As examples we study various choices of λ(t), related to classical integral transforms.

 

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