2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/15632This article deals with dynamical systems depending on a slowly varying parameter. We present several physical examples illustrating memory effects, such as metastability and hysteresis, which frequently appear in these systems. A mathematical theory is outlined, which allows to show existence of hysteresis cycles, and determine related scaling laws.28 pages (AMS-LaTeX), 18 PS figuresChaotic DynamicsStatistical Mechanicstext