Infinitely many sign-changing solutions for a class of biharmonic equation with p-Laplacian and Neumann boundary condition

By introducing a subspace of H-2(Omega) with constraints partial derivative u/partial derivative n vertical bar(partial derivative Omega) = 0 and integral(Omega) udx = 0 and using the Fountain Theorem, we obtain the existence of infinitely many sign-changing high energy solutions for a biharmonic equations with p-Laplacian and Neumann boundary condition. (C) 2017 Elsevier Ltd. All rights reserved.