Some superlinear fourth order elliptic equations are considered. A family of solutions is proved to exist and to concentrate at a point in the limit. The proof relies on variational methods and makes use of a weak version ...

We consider the fourth-order problem {ε4△2u + V(x)u = f(u) +γ |U|2..-2u inRN u ∈ H 2(RN), where ε > 0, N ≥ 5, V is a positive continuous potential, is a function with subcritical growth and γ ∈ {0,1}. We relate the number ...

We consider the fourth-order problem{epsilon(4)Delta(2)u + V(x)u = f(u) + gamma vertical bar u vertical bar(2)**-(2)u in R-N u is an element of H-2(R-N),where epsilon > 0, N >= 5, V is a positive continuous potential, f ...