YES Problem: f(g(x)) -> g(g(f(x))) f(g(x)) -> g(g(g(x))) Proof: Arctic Interpretation Processor: dimension: 2 interpretation: [1 0 ] [f](x0) = [-& 1 ]x0, [0 0] [g](x0) = [0 0]x0 orientation: [1 1] [1 1] f(g(x)) = [1 1]x >= [1 1]x = g(g(f(x))) [1 1] [0 0] f(g(x)) = [1 1]x >= [0 0]x = g(g(g(x))) problem: f(g(x)) -> g(g(f(x))) Bounds Processor: bound: 0 enrichment: match automaton: final states: {1} transitions: f20() -> 2* g0(4) -> 1* g0(3) -> 4* f0(2) -> 3* 1 -> 3* problem: Qed