[F G vlist] tensor0 This function requires the package cohom.sm1. Example 1: [[(2 x Dx - 1)] [(2 x Dx - 3)] (x)] tensor0 Example 2: [[(-x*Dx^2+x-Dx+1)] [((x Dx + x +1)(Dx-1))] (x)] tensor0 Example 3: [[(x Dx -1) (y Dy -4)] [(Dx + Dy) (Dx-Dy^2)] (x,y)] tensor0