Existence of solutions for a system with general Hardy--Sobolev singular criticalities

In this paper we study a class of Hardy--Sobolev type systems defined in RN and coupled by a singular critical Hardy--Sobolev term. The main novelty of this work is that the orders of the singularities are independent and contained in a wide range. By means of variational techniques, we will prove the existence of positive bound and ground states for such a system. In particular, we find solutions as minimizers or Mountain--Pass critical points of the energy functional on the underlying Nehari manifold.