- - - Department of Mathematics, Tabriz Branch, Islamic Azad University, Tabriz, Iran

In this paper, we consider the application of the homotopy perturbation method (HPM) to compute the eigenvalues of the Sturm-Liouville problem (SLP) which is called non-definite SLP. Two important Examples show that HPM is reliable method for computing the eigenvalues of SLP.

Turning point, Sturm-Liouville, Homotopy perturbation method, eigenvalues