Harmonic oscillators at resonance,perturbed by a non-linear friction force |
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| Authors: | Philip KORMAN Yi LI |
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| Institution: | 1. Department of Mathematical Sciences, University of Cincinnati, Cincinnati Ohio 45221-0025, USA;2. Department of Mathematics and Statistics, Wright State University, Dayton OH 45435, USA |
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| Abstract: | 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. |
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| Keywords: | resonance existence of periodic solutions |
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