New Subclasses of Bi-Univalent Functions Associated with Exponential Functions and Fibonacci Numbers
DOI:
https://doi.org/10.21123/bsj.2024.9954Keywords:
Bi-univalent functions, Coefficient bounds, Exponential function, Fibonacci numbers, Komatu integral operator, SubordinationAbstract
Lewin discussed the class of bi-univalent functions and obtained the bound for the second coefficient, Sakar and Wanas defined two new subclasses of bi-univalent functions and obtained upper bounds for the elementary coefficients |a2| and |a3| for functions in these subclasses, Dziok et al. introduced the class of -convex shell-like functions, and they indicated a useful connection between the function and Fibonacci numbers. Recently, many bi-univalent function classes, based on well-known operators like Sãlãgean operator, Tremblay operator, Komatu integral operator, Convolution operator, Al-Oboudi Differential operator and other, have been defined. The aims of this paper is to introduce two new subclasses of bi-univalent functions using the subordination and the Komatu integral operator which are involved the exponential functions and shell-like curves with Fibonacci numbers, also find an estimate of the initial coefficients for these subclasses. The first subclass was defined using the subordination of the shell-like curve functions related to Fibonacci numbers and the second subclass was defined using the subordination of the exponential function. The Komatu integral operator was used in each of these subclasses. Limits were obtained for the elementary coefficients, specifically the second and third coefficients for these subclasses.
Received 14/10/2023
Revised 16/03/2024
Accepted 18/03/2024
Published Online First 20/06/2024
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Copyright (c) 2024 Majd Ayash, Hassan Baddour, Mohammad Ali, Abbas Kareem Wanas
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