Mathematics and Statistics Vol. 8(2), pp. 126 - 136
DOI: 10.13189/ms.2020.080208
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Sufficient conditions for univalence obtained by using Briot-Bouquet differential subordination

GeorgiaIrina Oros *, Alina Alb Lupas
Department of Mathematics and Computer Science, University of Oradea, Romania


In this paper, we define the operator Im : differential-integral operator, where Sm is S˘al˘agean differential operator and Lm is Libera integral operator. By using the operator Im the class of univalent functions denoted by is defined and several differential subordinations are studied. Even if the use of linear operators and introduction of new classes of functions where subordinations are studied is a well-known process, the results are new and could be of interest for young researchers because of the new approach derived from mixing a differential operator and an integral one. By using this differential–integral operator, we have obtained new sufficient conditions for the functions from some classes to be univalent. For the newly introduced class of functions, we show that is it a class of convex functions and we prove some inclusion relations depending on the parameters of the class. Also, we show that this class has as subclass the class of functions with bounded rotation, a class studied earlier by many authors cited in the paper. Using the method of the subordination chains, some differential subordinations in their special Briot-Bouquet form are obtained regarding the differential–integral operator introduced in the paper. The best dominant of the Briot-Bouquet differential subordination is also given. As a consequence, sufficient conditions for univalence are stated in two criteria. An example is also illustrated, showing how the operator is used in obtaining Briot–Bouquet differential subordinations and the best dominant.

Analytic Function, Differential Operator, Integral Operator, Convex Function, Univalent Function, Differential Subordination, Differential Subordination Briot-bouquet, Dominant, Best Dominant

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] GeorgiaIrina Oros , Alina Alb Lupas , "Sufficient conditions for univalence obtained by using Briot-Bouquet differential subordination," Mathematics and Statistics, Vol. 8, No. 2, pp. 126 - 136, 2020. DOI: 10.13189/ms.2020.080208.

(b). APA Format:
GeorgiaIrina Oros , Alina Alb Lupas (2020). Sufficient conditions for univalence obtained by using Briot-Bouquet differential subordination. Mathematics and Statistics, 8(2), 126 - 136. DOI: 10.13189/ms.2020.080208.