Carathéodory sets in the tridisk
Łukasz Kosiński
Jagiellonian University, Krakow, PolandJohn E. McCarthy
Washington University in St. Louis, St. Louis, USA

Abstract
We characterize all algebraic subsets of the tridisk that are Carathéodory sets, that is the intrinsic Carathéodory metric on the set equals the Carathéodory metric for the tridisk. We show that such sets are either retracts, or are isomorphic to one particular exceptional set.
Cite this article
Łukasz Kosiński, John E. McCarthy, Carathéodory sets in the tridisk. Rev. Mat. Iberoam. (2025), published online first
DOI 10.4171/RMI/1566