Journal
JOURNAL OF DIFFERENTIAL EQUATIONS
Volume 200, Issue 1, Pages 69-104Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jde.2003.09.010
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The existence of periodic relaxation oscillations in singularly perturbed systems with two slow and one fast variable is analyzed geometrically. It is shown that near a singular periodic orbit a return map can be defined which has a one-dimensional slow manifold with a stable invariant foliation. Under a natural hyperbolicity assumption on the singular periodic orbit this allows to prove the existance of a periodic relaxation orbit for small values of the perturbation parameter. Additionally the existance of an invariant torus is proved for the periodically forced van der Pol oscillator. The analysis is based on methods from geometric singular pertubation theory. The blow-up method is used to analyze the dynamics near the fold-curves. (C) 2004 Elsevier Inc All rights reserved.
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