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Öğe ON SHARP GENERAL COEFFICIENT ESTIMATES FOR ?-SPIRALLIKE FUNCTIONS(Korean Mathematical Soc, 2023) Altinkaya, Sahsene; Yavuz, TugbaThis paper attempts to investigate a new subfamily ST & thetasym;,& sigma; (& alpha;, & beta;, & gamma;, & mu;) of spirallike functions endowed with Mittag-Leffler and Wright functions. The paper further investigates sharp coefficient bounds for functions that belong to this class.Öğe UPPER BOUND ON THE THIRD HANKEL DETERMINANT FOR FUNCTIONS DEFINED BY RUSCHEWEYH DERIVATIVE OPERATOR(Korean Mathematical Soc, 2018) Yavuz, TugbaLet S denote the class of analytic and univalent functions in the open unit disk D = {z : vertical bar z vertical bar < 1} with the normalization conditions f(0) = 0 and f'(0) = 1. In the present article, an upper bound for third order Hankel determinant H-3 (1) is obtained for a certain subclass of univalent functions generated by Ruscheweyh derivative operator.
