Open Access
2019 Certain Subclasses of Bi-Close-to-Convex Functions Associated with Quasi-Subordination
Gurmeet Singh, Gurcharanjit Singh, Gagandeep Singh
Abstr. Appl. Anal. 2019: 1-6 (2019). DOI: 10.1155/2019/6947020


In the present investigation, we introduce certain new subclasses of the class of biunivalent functions in the open unit disc U=z:z<1 defined by quasi-subordination. We obtained estimates on the initial coefficients a2 and a3 for the functions in these subclasses. The results present in this paper would generalize and improve those in related works of several earlier authors.


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Gurmeet Singh. Gurcharanjit Singh. Gagandeep Singh. "Certain Subclasses of Bi-Close-to-Convex Functions Associated with Quasi-Subordination." Abstr. Appl. Anal. 2019 1 - 6, 2019.


Received: 13 January 2019; Accepted: 7 March 2019; Published: 2019
First available in Project Euclid: 16 May 2019

zbMATH: 07054492
MathSciNet: MR3938976
Digital Object Identifier: 10.1155/2019/6947020

Rights: Copyright © 2019 Hindawi

Vol.2019 • 2019
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