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On the existence of periodic solutions for autonomous retarded functional differential equations on R2

Published online by Cambridge University Press:  14 November 2011

J. G. Dos Reis
Affiliation:
Faculdade de Medicina de Ribeirão Preto, Departamento de Matemática, Universidade de São Paulo, 14.100, Ribeirão Preto, São Paulo, Brasil
R. L. S. Baroni
Affiliation:
Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Departamento de Matemática, Universidade de São Paulo, 14.100, Ribeirão Preto, São Paulo, Brasil

Synopsis

Let Ca be the set of all the continuous functions from the interval [−r, 0] on the sphere of radius a, on the plane. We prove, under certains conditions, that a retarded autonomous differential equation that leaves Ca invariant has a non-constant periodic solution.

Type
Research Article
Copyright
Copyright © Royal Society of Edinburgh 1986

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