Dogan, Abdulkadir2025-09-252025-09-2520181385-12921572-9281https://doi.org/10.1007/s11117-018-0583-4https://hdl.handle.net/20.500.12573/4434This paper deals with the existence of positive solutions of nonlinear differential equation subject to the boundary conditions By using Schauder's fixed point theorem, we show that it has at least one positive solution if f is nonnegative and continuous. Positive solutions of the above boundary value problem satisfy theHarnack inequality inf(0 <= t <= 1) u(t) >= gamma parallel to u parallel to(infinity.)eninfo:eu-repo/semantics/closedAccessDifferential EquationNonlinear Boundary Value ProblemsPositive SolutionsFixed Point TheoremArticle10.1007/s11117-018-0583-42-s2.0-85047167132