Fourth Hankel determinant for the family of functions with bounded turning. (English) Zbl 1411.30009
Summary: The main aim of this paper is to study the fourth Hankel determinant for the class of functions with bounded turning. We also investigate for \(2\)-fold symmetric and \(3\)-fold symmetric functions.
MSC:
| 30C45 | Special classes of univalent and multivalent functions of one complex variable (starlike, convex, bounded rotation, etc.) |
| 30C50 | Coefficient problems for univalent and multivalent functions of one complex variable |
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