YES Problem: f(x,y) -> g(x,y) g(h(x),y) -> h(f(x,y)) g(h(x),y) -> h(g(x,y)) Proof: Matrix Interpretation Processor: dim=1 interpretation: [g](x0, x1) = 5x0 + x1 + 4, [f](x0, x1) = 5x0 + x1 + 4, [h](x0) = x0 + 1 orientation: f(x,y) = 5x + y + 4 >= 5x + y + 4 = g(x,y) g(h(x),y) = 5x + y + 9 >= 5x + y + 5 = h(f(x,y)) g(h(x),y) = 5x + y + 9 >= 5x + y + 5 = h(g(x,y)) problem: f(x,y) -> g(x,y) Matrix Interpretation Processor: dim=3 interpretation: [1 0 0] [1 0 0] [g](x0, x1) = [0 0 0]x0 + [0 0 0]x1 [0 0 0] [0 0 0] , [1 0 0] [1 0 0] [1] [f](x0, x1) = [0 0 0]x0 + [0 0 0]x1 + [0] [0 0 0] [0 0 1] [0] orientation: [1 0 0] [1 0 0] [1] [1 0 0] [1 0 0] f(x,y) = [0 0 0]x + [0 0 0]y + [0] >= [0 0 0]x + [0 0 0]y = g(x,y) [0 0 0] [0 0 1] [0] [0 0 0] [0 0 0] problem: Qed