Multiple solutions for a class of sublinear Schrِdinger equations

In this paper, we study the existence of infinitely many nontrivial solutions for a class of sublinear Schrödinger equations − △ u + V ( x ) u = f ( x , u ) , where f ( x , u ) = μ ξ ( x ) | u | μ − 2 u with 1 < μ < 2 and ξ : R N → R being a positive continuous function.