NO Problem: f(h(x)) -> f(i(x)) f(i(x)) -> a() i(x) -> h(x) Proof: Matrix Interpretation Processor: dimension: 1 interpretation: [a] = 0, [i](x0) = x0 + 4, [f](x0) = 5x0 + 4, [h](x0) = x0 + 4 orientation: f(h(x)) = 5x + 24 >= 5x + 24 = f(i(x)) f(i(x)) = 5x + 24 >= 0 = a() i(x) = x + 4 >= x + 4 = h(x) problem: f(h(x)) -> f(i(x)) i(x) -> h(x) Unfolding Processor: loop length: 2 terms: f(h(x4)) f(i(x4)) context: [] substitution: x4 -> x4 Qed