Altinkaya, SahseneÖzkan, Yeşim Sağlam2024-09-182024-09-182017-12-011406-2283https://doi.org/10.12697/ACUTM.2017.21.19https://ojs.utlib.ee/index.php/ACUTM/article/view/ACUTM.2017.21.19https://hdl.handle.net/11452/44867We construct two new subclasses of univalent functions in the open unit disk U = {z : vertical bar z vertical bar < 1 . For the first class ( pound lambda)(beta) of Salagean type lambda--pseudo-starlike functions, using the sigmoid function, we establish upper bounds for the initial coefficients of the functions in this class. Furthermore, for the second class ( pound lambda)(beta, phi) we obtain Fekete-Szego inequalities. The results presented in this paper generalize the recent work of Babalola.eninfo:eu-repo/semantics/openAccessLambda-pseudo-starlike functionsSigmoid functionSalagean derivativeBazilevic functionsCoefficient boundsFekete-szego inequalitiesScience & technologyPhysical sciencesMathematicsArticle00041855410000927528521210.12697/ACUTM.2017.21.192228-4699