摘要

We consider the semilinear Schrodinger equation {-Delta u + V(x)u = f(x,u), x is an element of R-N, u is an element of H-1(R-N), where V(x) is asymptotically periodic and sign-changing,f(x, u) is asymptotically periodic in x, and asymptotically linear as vertical bar u vertical bar -> infinity. Under some weak assumptions on V and f, we prove that the above problem has a nontrivial solution.