2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/61408We study a hard regime of stimulation of two-frequency oscillations in the main resonance equation with a fast oscillating external force: $ \ve i ψ' + |ψ|^2ψ= \exp\big(it^2/ (2\ve)\big), 0<\ve\ll1$. This phenomenon is caused by resonance between an eigenmode and the external force. The asymptotic solution before, inside and after the resonance layer is studied in detail and matched.LaTeX, 48 pages, two figuresDynamical SystemsMathematical PhysicsChaotic Dynamicstext