Three symmetric positive solutions of fourth-order singular nonlocal boundary value problems

In this paper, we study the existence of three positive solutions of fourth-order singular nonlocal boundary value problems. We show that there exist triple symmetric positive solutions by using Leggett-Williams fixed-point theorem. The conclusions in this paper essentially extend and improve some known results

Existence and nonexistence of positive solutions for a n-th order three-point boundary value problem

The purpose of this paper is to establish some results on the existence and nonexistence of positive solutions for a type of nonlinear n-th order three-point boundary value problems. The main tool is a fixed point theorem of the cone expansion and compression of functional type due to Avery, Anderson, and O’Regan. Some examples are presented to illustrate the availability of the main results.Publisher's Versio