Journal of Jianghan University(Natural Science Edition) ›› 2014, Vol. 42 ›› Issue (2): 27-30.

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Fekete-Szeg? Inequalities for Certain Subclasses of Analytic Functions

GUO Dong1，LI Zongtao2, XU Qingbing1   

  1. 1.Foundations Department，Chuzhou Vocational and Technical College，Chuzhou 239000，Anhui，China；2. Foundations Department，Guangzhou Civil Aviation College，Guangzhou 510403，Guangdong，China
  • Online:2014-04-25 Published:2014-05-15

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Abstract: The coefficient of fonctionelle |a3- μ(a2)2| on the class of D(λ,α,β) functions was accurately estimated，using Fekete-Szeg? inequality for the class of real component functions. On this basis，Fekete-Szeg? inequalities for the classes of functions defined by Hadamard convolution were obtained.

Key words: univalent function, D(λ,α,β) function, Fekete-Szeg? inequality, Hadamard convolution

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