Haghshenas, H. & Afrouzi, G. A. (2020). Solving of a neumann boundary value problem through variational methods. TWMS Journal of Applied and Engineering Mathematics, 10(4), 978-986.
Abstract
In this work, applying the multiple critical points theorems, we obtain the existence results of two and three classical solutions for a Neumann boundary value problem with the Sturm-Liouville equation.