2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/74729We justify an applicability of the adiabatic perturbation theory for three well known systems with impacts: a ball between two slowly moving walls, a slowly irregular waveguide, and an adiabatic piston.18 pages, 6 figuresDynamical SystemsMathematical Physics70H09; 70H11text