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Lower semicontinuity of attractors for non-autonomous dynamical systems

Published online by Cambridge University Press:  03 February 2009

ALEXANDRE N. CARVALHO
Affiliation:
Departamento de Matemática, Instituto de Ciências Matemáticas e de Computação, Universidade de São Paulo-Campus de São Carlos, Caixa Postal 668, 13560-970 São Carlos SP, Brazil (email: andcarva@icmc.usp.br)
JOSÉ A. LANGA
Affiliation:
Departamento de Ecuaciones Diferenciales y Análisis Numérico, Universidad de Sevilla, Apdo. de Correos 1036, 41080-Sevilla, Spain (email: langa@us.es)
JAMES C. ROBINSON
Affiliation:
Mathematics Institute, University of Warwick, Coventry CV4 7AL, UK (email: j.c.robinson@warwick.ac.uk)
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Abstract

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This paper is concerned with the lower semicontinuity of attractors for semilinear non-autonomous differential equations in Banach spaces. We require the unperturbed attractor to be given as the union of unstable manifolds of time-dependent hyperbolic solutions, generalizing previous results valid only for gradient-like systems in which the hyperbolic solutions are equilibria. The tools employed are a study of the continuity of the local unstable manifolds of the hyperbolic solutions and results on the continuity of the exponential dichotomy of the linearization around each of these solutions.

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Type
Research Article
Copyright
Copyright © Cambridge University Press 2009