2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/111436Let G be a totally disconnected, locally compact group admitting a contractive automorphism f. We prove a Jordan-Holder theorem for series of f-stable closed subgroups of G, classify all possible composition factors and deduce consequences for the structure of G.34 pages, LaTeXGroup Theory22D05 (Primary) 20E15; 20E36 (Secondary)text