On the order of convolution consistence of certain classes of harmonic functions with varying arguments
STUDIA UNIVERSITATIS BABES-BOLYAI MATHEMATICA(2023)
Abstract
Making use of a modified Hadamard product or convolution of har-monic functions with varying arguments, combined with an integral operator, we study when these functions belong to a given class. Following an idea of U. Bed-narz and J. Sokol we define the order of convolution consistence of three classes of functions and determine it for certain classes of harmonic functions with varying arguments defined using a convolution operator.
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Key words
Analytic functions with negative coefficients, univalent functions, ex-treme points, order of convolution consistence, starlikeness, convexity
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