In this paper,the inner radius of univalency of hyperbolic domains by pre-Schwarzian derivative is studied,and some general formulas for the lower bound of the inner radius are established. As their applications,the lower bounds of inner radiuses for angular domains and strongly starlike domains are obtained.
Tao CHENG~(1,2+) Ji-xiu CHEN~1 1 School of Mathematical Sciences,Fudan University,Shanghai 200433,China
The local connectivity of Julia sets for the family of biquadratic polynomials f_c(z)= (z^2-2c^2)z^2 with a parameter c is discussed.It is proved that for any parameter c,the boundary of the immediately attracting domain of f_c is a Jordan curve.
Jing L~(1+) Wei-yuan QIU~2 ~1 Department of Basic Education,Shanghai Maritime University,Shanghai 200000,China
In this paper, a class of higher order linear differential equation is investigated. The order and the hyper-order of the solutions of the equation are exactly estimated under some certain conditions.
