Coefficients estimates for functions in \(B_n (\alpha)\)
Summary: We consider functions \(f\), analytic in the unit disc and of the normalised form \(f(z) = z + \sum_{k=2}^\infty a_k z^k\) . For functions \(f \in B_n (\alpha)\), the class of functions involving the Sălăgean differential operator, we give some coefficient estimates, namely, \(| a_2| \), \(| a_3| \), and \(| a_4| \).
scientific article; zbMATH DE number 2012643