International Journal of Mathematics and Mathematical Sciences
Volume 17 (1994), Issue 2, Pages 249-252
doi:10.1155/S0161171294000360
A class of bounded starlike functions
Department of Mathematics, University of Charleston, Charleston 29424, SC, USA
Received 8 April 1993
Copyright © 1994 Herb Silverman. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
We consider functions f(z)=z+… that are analytic in the unit disk and satisfy there the inequality Re(f′(z)+zf″(z))>α, α<1. We find extreme points and then determine sharp lower bounds on Ref′(z) and Re(f(z)/z). Sharp results for the sequence of partial sums are also found.