“…In recent years, many authors have discussed the existence and multiplicity of solutions for discrete boundary value problems by using variational methods. For the papers involving the discrete p(k)-Laplacian operator, we refer the readers to [5,21,22,23,24,29,36,38]. In the case where p(k) is a constant called the discrete p-Laplacian operator, we refer to recent works [1,2,10,11,12,13,14] and references therein.…”