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Variation of constants formula and exponential dichotomy for nonautonomous non-densely defined Cauchy problems

Published online by Cambridge University Press:  29 June 2020

Pierre Magal*
Affiliation:
Université de Bordeaux, IMB, UMR 5251, F-33076Bordeaux, France and CNRS, IMB, UMR 5251, F-33400Talence, France
Ousmane Seydi
Affiliation:
Département Tronc Commun, Ecole Polytechnique de Thiès, Thiès21001, Sénégal e-mail: [email protected]

Abstract

In this paper, we extend to the non-Hille–Yosida case a variation of constants formula for a nonautonomous and nonhomogeneous Cauchy problems first obtained by Gühring and Räbiger. By using this variation of constants formula, we derive a necessary and sufficient condition for the existence of an exponential dichotomy for the evolution family generated by the associated nonautonomous homogeneous problem. We also prove a persistence result of the exponential dichotomy for small perturbations. Finally, we illustrate our results by considering two examples. The first example is a parabolic equation with nonlocal and nonautonomous boundary conditions, and the second example is an age-structured model that is a hyperbolic equation.

Type
Article
Copyright
© Canadian Mathematical Society 2020

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