α-星象函数之逆函数的第四项系数估计

本文获得a-星象函数之逆函数的第四项系数的准确界限。

The Fourth Coefficient Estimation for the Inverses of a-Starlike Functions

Let Sa* (0≤a<1) denote the class of functions f(z)=z+…analytic in the Unit disk |z|<1 and satisfy Re(zf’(z)/f(z))>a (|z|<1). Suppose that f-1(w)=w+sum from k=2(rkwk) to ∞ is the inverse of f(z)∈Sa*, the sharp hounds for |rx|(k=2, 3) had been found1]. In