COEFFICIENT ESTIMATES FOR A NEW GENERAL SUBCLASS OF ANALYTIC BI-UNIVALENT FUNCTIONS

BULUT S.

KOREAN JOURNAL OF MATHEMATICS, cilt.29, sa.3, ss.519-526, 2021 (ESCI) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 29 Sayı: 3
  • Basım Tarihi: 2021
  • Doi Numarası: 10.11568/kjm.2021.29.3.519
  • Dergi Adı: KOREAN JOURNAL OF MATHEMATICS
  • Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI), Scopus
  • Sayfa Sayıları: ss.519-526
  • Anahtar Kelimeler: Analytic function, univalent function, bi-univalent function, coefficient bounds
  • Kocaeli Üniversitesi Adresli: Evet

Özet

In a very recent paper, Yousef et al. [Anal. Math. Phys. 11: 58 (2021)] introduced two new subclasses of analytic and bi-univalent functions and obtained the estimates on the first two Taylor-Maclaurin coefficients vertical bar a(2)vertical bar and vertical bar a(3)vertical bar for functions belonging to these classes. In this study, we introduce a general subclass B-Sigma(h,p) (lambda, mu, delta) of analytic and bi-univalent functions in the unit disk U, and investigate the coefficient bounds for functions belonging to this general function class. Our results improve the results of the above mentioned paper of Yousef et al.