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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