In Discontinuous Galerkin Method and Finite Volume Method, 1d and 2d Rieman solver must be employed to get the flux between the adjcent elements.Does maple have the function to solve such Rieman problems? Thanks for ur reply!

I am new to maple. At present, i am do some study on FEM. so i want to ask if there is some command in maple about the fomulation of Green and Gauss theorem. for i want to change to the body integral to the boundary integral. Thanks for your reply!