Abstract
On considere l'equation generalisee: x''+f(x)x'+g(x)=e(t) de l'equation de Duffing, avec f(x), g(x)∈C 2 (R); e(t) est periodique de plus petite periode L, |e(t)|≤E ∀t, E une constante positive. On donne un theoreme d'existence des solutions periodiques et les regions ou ces solutions existent
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