Abstract
This chapter is devoted to the existence, multiplicity, and nonexistence of positive solutions for some classes of systems of nonlinear higher-order ordinary differential equations with parameters or without parameters, subject to multipoint boundary conditions, and for which the nonlinearities are nonsingular or singular functions. A system of higher-order differential equations with sign-changing nonlinearities and Riemann–Stieltjes integral boundary conditions is also investigated. Illustrative examples are given to support our results.
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