Bi-concave Functions Defined by Al-Oboudi Differential Operator

author

  • Ş. Altinkaya Department of Mathematics, Beykent University, 34500, Istanbul, Turkey
Abstract:

The purpose of the present paper is to introduce a class $D_{Sigma ;delta }^{n}C_{0}(alpha )$ of bi-concave functions defined by Al-Oboudi differential operator. We find estimates on the Taylor-Maclaurin coefficients $leftvert a_{2}rightvert $ and $leftvert a_{3}rightvert$ for functions in this class. Several consequences of these results are also pointed out in the form of corollaries.

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Journal title

volume 17  issue 1

pages  207- 217

publication date 2022-04

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