Abstract and Applied Analysis
Volume 2003 (2003), Issue 20, Pages 1141-1158
doi:10.1155/S1085337503309042

The Apollonian metric: limits of the comparison and bilipschitz properties

Abstract

The Apollonian metric is a generalization of the hyperbolic metric. It is defined in arbitrary domains in ℝn. In this paper, we derive optimal comparison results between this metric and the jG metric in a large class of domains. These results allow us to prove that Euclidean bilipschitz mappings have small Apollonian bilipschitz constants in a domain G if and only if G is a ball or half-space.