Positive solutions for a higher-order four-point boundary value problem with a pp-Laplacian

In this paper, we study the existence of positive solutions of the following nnth-order four-point boundary value problem with one dimensional pp-Laplacian {(ϕp(u(n−1)))′+h(t)f(t,u(t),u′(t),…,u(n−2)(t))=0,01,0<α≤1ξ,0<β≤11−η,0<ξ<η<1. By using a fixed point theorem in cones, the existence of a positive solution and multiple positive solutions is obtained. Also, at the end of this paper, we present a generalization of this problem.