HARMONIC OSCILLATORS AT RESONANCE,PERTURBED BY A NON-LINEAR FRICTION FORCE

摘要

This note is an addendum to the results of Lazer and Frederickson [1], and Lazer[4] on periodic oscillations, with linear part at resonance. We show that a small modification of the argument in [4] provides a more general result. It turns out that things are different for the corresponding Dirichlet boundary value problem.