YES Problem: f(g(x)) -> g(g(f(x))) f(g(x)) -> g(g(g(x))) Proof: DP Processor: DPs: f#(g(x)) -> f#(x) TRS: f(g(x)) -> g(g(f(x))) f(g(x)) -> g(g(g(x))) Usable Rule Processor: DPs: f#(g(x)) -> f#(x) TRS: Arctic Interpretation Processor: dimension: 4 usable rules: interpretation: [f#](x0) = [0 -& -& -&]x0, [1 0 -2 -2] [-2] [-2 -1 -1 -1] [-1] [g](x0) = [0 -2 -1 -1]x0 + [-1] [-2 -1 -1 -1] [-1] orientation: f#(g(x)) = [1 0 -2 -2]x + [-2] >= [0 -& -& -&]x = f#(x) problem: DPs: TRS: Qed