Open AccessEstimates for initial coefficients of certain bi-univalent functions
Author(s) -
Vibha Madaan,
Ajay Kumar,
V. Ravichandran
Publication year - 2021
Publication title -
filomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.449
H-Index - 34
eISSN - 2406-0933
pISSN - 0354-5180
DOI - 10.2298/fil2106993m
Subject(s) - mathematics , analytic function , unit disk , extension (predicate logic) , function (biology) , univalent function , unit (ring theory) , pure mathematics , mathematical analysis , mathematics education , evolutionary biology , computer science , biology , programming language
Estimates are obtained for the initial coefficients of a normalized analytic function f in the unit disk D such that f and the analytic extension of f-1 to D belong to certain subclasses of univalent functions. The bounds obtained improve some existing known bounds.