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K-contractions and periodic solutions to nonlinear ordinary differential equations by resonance. (English) Zbl 0606.34028

We study the problem of the existence of periodic solutions for ordinary differential equations of the form \(x^{(m)}=g(t,x,...,x^{(m)})\), where g is a nonlinear vectorial function and m is arbitrary. For it, we transform our problem in the abstract form \(Lx=Nx\), where L and N are operators, linear and nonlinear respectively, defined from a normed space X into a normed space Z and then, to study this equation by using the coincidence degree theory developed by G. Hetzer [Ann. Soc. Sci. Bruxelles, Sér. I 89, 497-508 (1975; Zbl 0316.47041)]. Our results include the case where g is quasibounded or it is of exponential type.

MSC:

34C25 Periodic solutions to ordinary differential equations

Citations:

Zbl 0316.47041