On a New Class of Bi-Close-to-Convex Functions with Bounded Boundary Rotation

Author:

Breaz Daniel1,Sharma Prathviraj2,Sivasubramanian Srikandan2,El-Deeb Sheza M.34ORCID

Affiliation:

1. Department of Mathematics, “1 Decembrie 1918” University of Alba-Iulia, 510009 Alba Iulia, Romania

2. Department of Mathematics, University College of Engineering Tindivanam, Anna University, Tindivanam 604001, India

3. Department of Mathematics, College of Science and Arts, Al-Badaya, Qassim University, Buraidah 52571, Saudi Arabia

4. Department of Mathematics, Faculty of Science, Damietta University, New Damietta 34517, Egypt

Abstract

In the current article, we introduce a new class of bi-close-to-convex functions with bounded boundary rotation. For this new class, the authors obtain the first three initial coefficient bounds of the newly defined bi-close-to-convex functions with bounded boundary rotation. By choosing special bi-convex functions, the authors obtain the first three initial coefficient bounds in the last section. The authors also verify the special cases where the familiar Brannan and Clunie’s conjecture is satisfied. Furthermore, the famous Fekete–Szegö inequality is also obtained for this new class of functions. Apart from the new interesting results, some of the results presented here improves the earlier results existing in the literature.

Publisher

MDPI AG

Subject

General Mathematics,Engineering (miscellaneous),Computer Science (miscellaneous)

Reference27 articles.

1. Properties of a class of functions with bounded boundary rotation;Padmanabhan;Ann. Pol. Math.,1976

2. Functions of bounded boundary rotation;Pinchuk;Isr. J. Math.,1971

3. On the theory of univalent functions;Robertson;Ann. Math.,1936

4. Über Gebiete von beschrankter Randdrehung;Paatero;Ann. Acad. Sci. Fenn. Ser. A,1933

5. On functions of bounded boundary rotation-I;Brannan;Proc. Edinb. Math. Soc.,1969

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