LaplacianPDETerm
LaplacianPDETerm[vars] represents a Laplacian term ∇²u with model variables vars.
LaplacianPDETerm[vars, pars] uses model parameters pars.
Examples
LaplacianPDETerm[{u[x, y], {x, y}}]
(* LaplacianPDETerm[{u[x, y], {x, y}}] *)Please visit the official Wolfram Language Reference for more details.