Some Results of Differential Subordination and Superordination for Univalent Functions

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DOIAbstractKey words
10.52113/2/08.01.2021/91-97
Let 1 and 2 belong to a certain class of normalized analytic univalent functions in the open unit disk of the complex plane. Sufficient conditions are obtained for normalized analytic functions to satisfy the double subordination chain 1() ≺() ≺ 2() , then we obtain 1() is the best subordinant, 2() is the best dominant. Also we derive some sandwich –type result.
Univalent function ,Differential subordination ,Differential superordination , Sandwich theorem

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