Existence of solutions for the (p,q)-Laplacian equation with nonlocal Choquard reaction

In this paper we study the following (p,q)-Laplacian equation with nonlocal Choquard reaction −Δpu−Δqu+V(x)(|u|p−2u+|u|q−2u)=1|x|μ∗F(u)f(u)inRN,where 1