A result on elliptic systems with Neumann conditions via Ricceri’s three critical points theorem Original Research Article

This paper is concerned with the study of the existence of nontrivial solutions for elliptic systems involving the pp-Laplacian. By using the result of [B. Ricceri, A three critical points theorem revisited, Nonlinear Anal. (2008), in press (doi:10.1016/j.na.2008.04.010)], we establish the existence of at least three solutions.