Hilbert and Thompson geometries isometric to infinite-dimensional Banach spaces

Abstract

We study the horofunction boundaries of Hilbert and Thompson geometries, and of Banach spaces, in arbitrary dimension. By comparing the boundaries of these spaces, we show that the only Hilbert and Thompson geometries that are isometric to Banach spaces are the ones defined on the cone of positive continuous functions on a compact space.

arXiv comment34 pages, 2 figures