2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/77327We show that group algebras kG of polycyclic-by-finite groups G, where k is a field, are catenary: Given prime ideals P and P' of kG, with P contained in P', all saturated chains of primes between P and P' have the same length.12 pages, AMS-LaTeXRings and Algebras16S34, 16D30, 16P40text