Orhan, HalitCaglar, Murat2026-03-262026-03-2620251793-55711793-718310.1142/S17935571255008092-s2.0-105012977465https://doi.org/10.1142/S1793557125500809https://hdl.handle.net/20.500.14901/3160Çağlar, Murat/0000-0001-8147-0343In this study, a new subclass of analytic functions in the open unit disk was defined with the help of the function obtained by applying the Salagean derivative to the q-Ruscheweyh derivative operator. For the functions belonging to this subclass, the coefficient bounds for the Fekete-Szeg & ouml; functional were determined. The results of this paper are a generalization of the results of Kanas and Darwish [Fekete-Szeg & ouml; problem for starlike and convex functions of complex order, Appl. Math. Lett. 23(7) (2010) 777-782].eninfo:eu-repo/semantics/closedAccessAnalytic FunctionsSalagean Derivative OperatorAnalytic FunctionsStarlike and Convex Function of Order BetaQ-Ruscheweyh Differential OperatorFekete-Szego FunctionalArticle