Abstract
On considere des equations sous lineaires de la forme y (n) +σf(t,y,y',...y (n−1 )=0 ou n≥2, σ=±1, et f:[0,∞)×R n →R est une fonction continue telle que yof(t,y 0 ,y 1 ,…,y n−1 )≥0 pour (t,y 0 ,y 1 ,…,y n−1 )∈[0,∞)×R n
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