title: Radius constants for analytic functions with fixed second coefficient.
abstract: Let f(z) = z + ∑(n=2)(∞) (a)n(z) (n) be analytic in the unit disk with the second coefficient a2 satisfying |a2| = 2b, 0 ≤ b ≤ 1. Sharp radius of Janowski starlikeness is obtained for functions f whose nth coefficient satisfies |a(n)| ≤ cn + d (c, d ≥ 0) or |a(n)| ≤ c/n  (c > 0 and n ≥ 3). Other radius constants are also obtained for these functions, and connections with earlier results are made.
authors.affiliation: Department of Mathematics, College of Natural Sciences & Mathematics, California State University, 800 North State College Boulevard, Fullerton, CA 92831-3599, USA.
authors.forename: Mahnaz M
authors.initials: MM
authors.lastname: Nargesi
authors.affiliation: School of Mathematical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia.
authors.forename: Rosihan M
authors.initials: RM
authors.lastname: Ali
authors.affiliation: Department of Mathematics, University of Delhi, Delhi 110 007, India.
authors.forename: V
authors.initials: V
authors.lastname: Ravichandran