Radius of starlikeness for some classes containing non-univalent functions

A starlike univalent function f is characterized by the function zf'(z)/f(z); several subclasses of these functions were studied in the past by restricting the function zf'(z)/f(z) to take values in a region \Omega on the right-half plane, or, equivalently, by requiring the function zf'(z)/f(z) to be subordinate to the corresponding... Show more