Altınkaya, ŞahseneYalçın, Sibel2024-09-252024-09-252016-01-010373-3505https://doi.org/10.4418/2016.71.1.7https://lematematiche.dmi.unict.it/index.php/lematematiche/article/view/1205https://hdl.handle.net/11452/45210In the present investigation, we introduce and investigate a new subclass of the function class Sigma of bi-univalent functions defined in the open unit disc. We find estimates on the coefficients vertical bar a(2)vertical bar and vertical bar a(3)vertical bar for functions in the function class S-Sigma (n, h, lambda). The results presented in this paper improve or generalize the recent works of Jothibasu [13] and other authors.eninfo:eu-repo/semantics/closedAccessAnalytic and univalent functionsBi-univalent functionsCoefficient boundsScience & technologyPhysical sciencesMathematicsArticle000393407500007899771110.4418/2016.71.1.72037-5298