On homoclinic solutions for a second order difference equation with p-Laplacian

Abstract

In this paper, we obtain conditions under which the difference equation $-\Delta \left( a(k)\phi _{p}(\Delta u(k-1))\right) +b(k)\phi_{p}(u(k))=\lambda f(k,u(k)),\quad k\in \mathbb{Z}$, has infinitely many homoclinic solutions. A variant of the fountain theorem is utilized in the proof of our theorem. It improves the results in [L.Kong, homoclinic solutions for a second order difference equation with $p-$Laplacian, \textit{Appl. Math. Comput}., \textbf{247} (2014), 1113--1121], where the set of conditions imposed on nonlinearity is inconsistent.