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Coefficients estimates for functions in \(B_n (\alpha)\). (English) Zbl 1035.30005
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 \(| a_4| \).
MSC:
30C45 Special classes of univalent and multivalent functions of one complex variable (starlike, convex, bounded rotation, etc.)
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