Coefficient problem for certain subclasses of bi-univalent functions defined by convolution

Abstract

In this paper, we consider a general subclass HλΣ (h, β) of bi-univalent functions. Bounds on the first two coefficients اa2ا and اa3ا for functions in HλΣ (h, β) are given. The main results generalize and improve a recent one obtained by Srivastava [18].

Keywords

• analytic and univalent functions
• bi-univalent functions
• convolution