An Investigation of the Third Hankel Determinant Problem for Certain Subfamilies of Univalent Functions Involving the Exponential Function

Shi, LeiSrivastava, H.M.Arif, MuhammadHussain, ShehzadKhan, Hassan2019-05-172019-05-1720192019Shi, L., Srivastava, H.M., Arif, M., Hussain, S. & Khan, H. (2019). An Investigation of the Third Hankel Determinant Problem for Certain Subfamilies of Univalent Functions Involving the Exponential Function. Symmetry, 11(5), 598. https://doi.org/10.3390/sym11050598https://doi.org/10.3390/sym11050598http://hdl.handle.net/1828/10883In the current article, we consider certain subfamilies S∗e and Ce of univalent functions associated with exponential functions which are symmetric along real axis in the region of open unit disk. For these classes our aim is to find the bounds of Hankel determinant of order three. Further, the estimate of third Hankel determinant for the family S∗e in this work improve the bounds which was investigated recently. Moreover, the same bounds have been investigated for 2-fold symmetric and 3-fold symmetric functions.ensubordinationsexponential functionHankel determinantAn Investigation of the Third Hankel Determinant Problem for Certain Subfamilies of Univalent Functions Involving the Exponential FunctionArticleDepartment of Mathematics and Statistics