We consider the system Ju ̇ =∇H(u)+f(u)+p(t), where H : R^2 → R is of class C^1 with locally Lipschitz continuous gradient, f : R^2 → R^2 is locally Lipschitz continuous and bounded, and p : R → R^2 is measurable, bounded and T −periodic. Here, J is the standard symplectic matrix. For some classes of functions f, we give new existence theorems for periodic solutions and for unbounded solutions. Applications are given to forced second-order differential equations with separated nonlinearities.
Planar differential systems at resonance / Fonda, Alessandro; Mawhin, J.. - In: ADVANCES IN DIFFERENTIAL EQUATIONS. - ISSN 1079-9389. - STAMPA. - 11:(2006), pp. 1111-1133.
Planar differential systems at resonance
FONDA, ALESSANDRO;
2006-01-01
Abstract
We consider the system Ju ̇ =∇H(u)+f(u)+p(t), where H : R^2 → R is of class C^1 with locally Lipschitz continuous gradient, f : R^2 → R^2 is locally Lipschitz continuous and bounded, and p : R → R^2 is measurable, bounded and T −periodic. Here, J is the standard symplectic matrix. For some classes of functions f, we give new existence theorems for periodic solutions and for unbounded solutions. Applications are given to forced second-order differential equations with separated nonlinearities.Pubblicazioni consigliate
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