2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/125976It is explained how the unification of resonance and decay phenomena into a consistent mathematical theory leads to quantum mechanical time-asymmetry. This provides the theoretical basis for a subsequent paper II in which the interpretation and experimental demonstration of this time-asymmetry is discussed.LaTeX file, 19 pages, no figsQuantum Physicstext