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Some Results on Stability of Retarded Functional Differential Equations Using Dichotomic Map Techniques
Authors:Aparecida Bená  Maria  Dos Reis  José Geraldo
Institution:(1) Departamento de Física e Matemática, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto – USP, 14040-901-Ribeirão Preto SP, Brazil;(2) Departamento de Matemática, Faculdade de Ciências – UNESP, 17033-360-Bauru SP, Brazil
Abstract:This paper deals with the study of the stability of nonautonomous retarded functional differential equations using the theory of dichotomic maps. After some preliminaries, we prove the theorems on simple and asymptotic stability. Some examples are given to illustrate the application of the method. Main results about asymptotic stability of the equation 
$$x'(t) = - b(t)x(t - r)$$
and of itsnonlinear generalization 
$$x'(t) = b(t)f(x(t - r))$$
are established.
Keywords:asymptotic stability  dichotomic maps  retarded functional differential equation  stability
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