Existence and convergence of ground state solutions for a $(p,q)$-Laplacian system on weighted graphs

We investigate the existence of ground state solutions for a $(p,q)$-Laplacian system with $p,q>1$ and potential wells on a weighted locally finite graph $G=(V,E)$. By making use of the method of Nehari manifold and the Lagrange multiplier rule, we prove that if the nonlinear term F takes on the super-$(p, q)$-linear growth and the potential functions $a(x)$ and $b(x)$ satisfy some suitable conditions, then for any fixed parameter λ≥1, the system is provided with a ground state solution (u_λ, v_λ). Additionally, we set up the convergence property of the solutions set \(u_λ, v_λ)\ when λ → +∞.