Vol. 10 (2004)
Articles

On distortion under hyperbolically convex maps

Alexander Vasil'ev
Departamento de Matemática Universidad Técnica Federico Santa María, Valparaíso, Chile

Published 24-01-2025

Keywords

  • hyperbolically convex function,
  • distortion theorem,
  • modulus of families of curves,
  • reduced modulus.

Abstract

We study the class of hyperbolically convex bounded univalent functions with a boundary normalization in the unit disk U. In the paper we obtain the lower estimate for the distortion in this class. A two-point distortion theorem is also proved. The method of proofs is based on the reduced modulus of digons and the modulus of annuli.