Abstract
On considere l'equation differentielle de Lienard x″+f(x)x'+g(t,x)=s, ou s est un parametre reel, f et g sont des fonctions continues, et g est 2π-periodique en t. On etudie le nombre de solutions 2π-periodiques quand g satisfait lim |x|→+∞ g(t,x)=+∞, uniformement en t
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