2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/129048We will show that if a dynamical system has enough constants of motion then a Moser-Weinstein type theorem can be applied for proving the existence of periodic orbits in the case when the linearized system is degenerate.6 pages, no figuresDynamical SystemsMathematical Physics37C27text