%0 Journal Article %T On the Existence of Positive Solutions of a Nonlinear Differential Equation %A Sonia Ben Othman %A Habib Maagli %A Noureddine Zeddini %J International Journal of Mathematics and Mathematical Sciences %D 2007 %I Hindawi Publishing Corporation %R 10.1155/2007/58658 %X We study some existence results for the nonlinear equation (1/A)(Au')'=uψ(x,u) for x∈(0,ω) with different boundary conditions, where ω∈(0,∞], A is a continuous function on [0,ω), positive and differentiable on (0,ω), and ψ is a nonnegative function on (0,ω)×[0,∞) such that t↦tψ(x,t) is continuous on [0,∞) for each x∈(0,ω). We give asymptotic behavior for positive solutions using a potential theory approach. %U http://www.hindawi.com/journals/ijmms/2007/058658/abs/