YES Problem: f(x,g(x)) -> x f(x,h(y)) -> f(h(x),y) Proof: Matrix Interpretation Processor: dim=1 interpretation: [h](x0) = x0, [f](x0, x1) = x0 + x1 + 4, [g](x0) = 6x0 orientation: f(x,g(x)) = 7x + 4 >= x = x f(x,h(y)) = x + y + 4 >= x + y + 4 = f(h(x),y) problem: f(x,h(y)) -> f(h(x),y) Matrix Interpretation Processor: dim=3 interpretation: [1 0 0] [0] [h](x0) = [0 0 0]x0 + [0] [0 0 1] [1], [1 0 0] [1 0 1] [f](x0, x1) = [0 0 0]x0 + [0 0 0]x1 [0 0 0] [0 0 0] orientation: [1 0 0] [1 0 1] [1] [1 0 0] [1 0 1] f(x,h(y)) = [0 0 0]x + [0 0 0]y + [0] >= [0 0 0]x + [0 0 0]y = f(h(x),y) [0 0 0] [0 0 0] [0] [0 0 0] [0 0 0] problem: Qed