Approximation Dynamics and the Stability of Invariant Sets

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Abstract:

We introduce the concept of a weakly, normally hyperbolic set for a system of ordinary differential equations. This concept includes the notion of a hyperbolic flow, as well as that of a normally hyperbolic invariant manifold. Moreover, it has the property that it is closed under finite set products. Consequently, the theory presented here can be used for the study of perturbations of the dynamics of coupled systems of weakly, normally hyperbolic sets. Our main objective is to show that under a small C1-perturbation, a weakly, normally hyperbolic set K is preserved by a homeomorphism, where the image KY is a compact invariant set, with a related hyperbolic structure, for the perturbed equation. In addition, the homeomorphism is close to the identity in C0, 1 and the perturbed dynamics on KY are close to the original dynamics on K. Copyright 1998 Academic Press.

Document Type: Research Article

Affiliations: 1: Faculty of Mathematics and Mechanics, St. Petersburg University, St. Petersburg, Russia 2: School of Mathematics, University of Minnesota, Minneapolis, Minnesota, USA

Publication date: October 1, 1998

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