Abstract
On considere l'equation differentielle (py')'+qy=g(t,y,y') ou p=p(t) est une fonction positive continument differentiable sur I a =[a,∞) telle que p(a)=1, q=q(t) est une fonction continue sur I a et g=g(t,u,v) est une fonction continue sur I a ×R 2 qui verifie certaines conditions
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