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Periodic solutions of forced Liénard equations with jumping nonlinearities under nonuniform conditions*

Published online by Cambridge University Press:  14 November 2011

R. Iannacci
Affiliation:
Dipartimento di Metodi e Modelli Matematici per le Scienze Applicate, Università “La Sapienza”, Via A. Scarpa 10, 00161 Roma, Italy
M.N. Nkashama
Affiliation:
Department of Mathematical Sciences, Memphis State University, Memphis, Tennessee 38152, U.S.A.
P. Omari
Affiliation:
Dipartimento di Scienze Matematiche, Università, P.le Europa 1, 34100 Trieste, Italy
F. Zanolin
Affiliation:
Dipartimento di Matematica ed Informatica, Università, Via Zanon 6, 33100 Udine, Italy

Synopsis

This paper is devoted to the existence of periodic solutions for the scalar forced Lienard differential equation

The key assumptions relate the asymptotic behaviour as x →± ∞of g(t; x)/x to the “critical values” of the positively 1-homogeneous problem

No condition on f, except continuity, is assumed. Our approach is based on Leray–Schauder degree techniques and a priori estimates.

Type
Research Article
Copyright
Copyright © Royal Society of Edinburgh 1988

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