The Second Hankel Determinant Problem for a Class of Bi-Close-to-Convex Functions
MATHEMATICS, sa.10, 2019 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Basım Tarihi: 2019
- Doi Numarası: 10.3390/math7100986
- Dergi Adı: MATHEMATICS
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Kocaeli Üniversitesi Adresli: Evet
Özet
The purpose of the present work is to determine a bound for the functional H-2(2) = a(2)a(4) - a(3)(2) for functions belonging to the class C-Sigma of bi-close-to-convex functions. The main result presented here provides much improved estimation compared with the previous result by means of different proof methods than those used by others.