YES Problem: f(x,x) -> a() f(g(x),y) -> f(x,y) Proof: Matrix Interpretation Processor: dim=1 interpretation: [g](x0) = x0 + 3, [a] = 0, [f](x0, x1) = 4x0 + 7x1 + 4 orientation: f(x,x) = 11x + 4 >= 0 = a() f(g(x),y) = 4x + 7y + 16 >= 4x + 7y + 4 = f(x,y) problem: Qed