2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/126465In this article the author presents results on the selection for the space of convex hulls of $n$ points and compacts of the complete convex metric space of Busemann nonpositve curvature. Namely, we determine Lipschitz and Hölder properties of barycenter and cirumcenter mappings.10 pagesMetric Geometry54E40text