ESTIMATE ON THE SECOND HANKEL DETERMINANT FOR A SUBCLASS OF QUASI-CONVEX FUNCTIONS

摘要

In this paper, we consider the class K~*_a of the functions of the form f(z)= z + a_2z~2+???which are analytic univalent in the disc D= {z:|z|<1} such that Re >0 where g ε C. This paper focuses on the functional |a_2a_4 -a_3~2|for a function belonging to K~*_a is obtained.