YES Problem: strict: f(g(f(x))) -> f(g(g(g(f(x))))) weak: g(x) -> g(g(x)) Proof: Arctic Interpretation Processor: dimension: 3 interpretation: [0 -& 0 ] [g](x0) = [-& -& 0 ]x0 [-& -& -&] , [1 3 -&] [f](x0) = [0 2 3 ]x0 [0 2 -&] orientation: [3 5 -&] [2 4 -&] f(g(f(x))) = [2 4 -&]x >= [1 3 -&]x = f(g(g(g(f(x))))) [2 4 -&] [1 3 -&] [0 -& 0 ] [0 -& 0 ] g(x) = [-& -& 0 ]x >= [-& -& -&]x = g(g(x)) [-& -& -&] [-& -& -&] problem: strict: weak: g(x) -> g(g(x)) Qed