Electron. J. Diff. Equ., Vol. 2014 (2014), No. 56, pp. 1-13.

Discontinuous almost automorphic functions and almost automorphic solutions of differential equations with piecewise constant arguments

Alan Chavez, Samuel Castillo, Manuel Pinto

Abstract:
In this article we introduce a class of discontinuous almost automorphic functions which appears naturally in the study of almost automorphic solutions of differential equations with piecewise constant argument. Their fundamental properties are used to prove the almost automorphicity of bounded solutions of a system of differential equations with piecewise constant argument. Due to the strong discrete character of these equations, the existence of a unique discrete almost automorphic solution of a non-autonomous almost automorphic difference system is obtained, for which conditions of exponential dichotomy and discrete Bi-almost automorphicity are fundamental.

Submitted October 10, 2013. Published February 28, 2014.
Math Subject Classifications: 47D06, 47A55, 34D05, 34G10.
Key Words: Almost automorphic functions; difference equations; differential equation withpiecewise constant argument; exponential dichotomy.

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Alan Chávez
Universidad de Chile, Departamento de Matemáticas
Facultad de Ciencias, Casilla 653
Santiago, Chile
email: alancallayuc@gmail.com
Samuel Castillo
Universidad del Bio Bio, Departamento de Matemáticas
Facultad de Ciencias
Concepción, Chile
email: scastill@ubiobio.cl
Manuel Pinto
Universidad de Chile, Departamento de Matemáticas
Facultad de Ciencias, Casilla 653
Santiago, Chile
email: pintoj@uchile.cl

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