YES Problem: active(f(f(a()))) -> mark(f(g(f(a())))) mark(f(X)) -> active(f(mark(X))) mark(a()) -> active(a()) mark(g(X)) -> active(g(X)) f(mark(X)) -> f(X) f(active(X)) -> f(X) g(mark(X)) -> g(X) g(active(X)) -> g(X) Proof: Matrix Interpretation Processor: dim=3 interpretation: [1 0 0] [0] [mark](x0) = [0 1 1]x0 + [1] [0 0 0] [0], [1 0 0] [f](x0) = [0 0 0]x0 [1 0 0] , [1 1 0] [g](x0) = [0 0 0]x0 [0 0 0] , [0] [a] = [0] [0], [1 1 0] [0] [active](x0) = [0 0 0]x0 + [1] [0 0 0] [0] orientation: [0] [0] active(f(f(a()))) = [1] >= [1] = mark(f(g(f(a())))) [0] [0] [1 0 0] [0] [1 0 0] [0] mark(f(X)) = [1 0 0]X + [1] >= [0 0 0]X + [1] = active(f(mark(X))) [0 0 0] [0] [0 0 0] [0] [0] [0] mark(a()) = [1] >= [1] = active(a()) [0] [0] [1 1 0] [0] [1 1 0] [0] mark(g(X)) = [0 0 0]X + [1] >= [0 0 0]X + [1] = active(g(X)) [0 0 0] [0] [0 0 0] [0] [1 0 0] [1 0 0] f(mark(X)) = [0 0 0]X >= [0 0 0]X = f(X) [1 0 0] [1 0 0] [1 1 0] [1 0 0] f(active(X)) = [0 0 0]X >= [0 0 0]X = f(X) [1 1 0] [1 0 0] [1 1 1] [1] [1 1 0] g(mark(X)) = [0 0 0]X + [0] >= [0 0 0]X = g(X) [0 0 0] [0] [0 0 0] [1 1 0] [1] [1 1 0] g(active(X)) = [0 0 0]X + [0] >= [0 0 0]X = g(X) [0 0 0] [0] [0 0 0] problem: active(f(f(a()))) -> mark(f(g(f(a())))) mark(f(X)) -> active(f(mark(X))) mark(a()) -> active(a()) mark(g(X)) -> active(g(X)) f(mark(X)) -> f(X) f(active(X)) -> f(X) Matrix Interpretation Processor: dim=3 interpretation: [1 0 0] [mark](x0) = [0 1 0]x0 [0 0 0] , [1 1 0] [0] [f](x0) = [0 0 0]x0 + [1] [0 1 0] [0], [1 0 0] [g](x0) = [0 0 0]x0 [0 0 0] , [0] [a] = [0] [0], [1 0 0] [active](x0) = [0 1 0]x0 [0 0 0] orientation: [1] [0] active(f(f(a()))) = [1] >= [1] = mark(f(g(f(a())))) [0] [0] [1 1 0] [0] [1 1 0] [0] mark(f(X)) = [0 0 0]X + [1] >= [0 0 0]X + [1] = active(f(mark(X))) [0 0 0] [0] [0 0 0] [0] [0] [0] mark(a()) = [0] >= [0] = active(a()) [0] [0] [1 0 0] [1 0 0] mark(g(X)) = [0 0 0]X >= [0 0 0]X = active(g(X)) [0 0 0] [0 0 0] [1 1 0] [0] [1 1 0] [0] f(mark(X)) = [0 0 0]X + [1] >= [0 0 0]X + [1] = f(X) [0 1 0] [0] [0 1 0] [0] [1 1 0] [0] [1 1 0] [0] f(active(X)) = [0 0 0]X + [1] >= [0 0 0]X + [1] = f(X) [0 1 0] [0] [0 1 0] [0] problem: mark(f(X)) -> active(f(mark(X))) mark(a()) -> active(a()) mark(g(X)) -> active(g(X)) f(mark(X)) -> f(X) f(active(X)) -> f(X) Matrix Interpretation Processor: dim=1 interpretation: [mark](x0) = x0 + 1, [f](x0) = x0, [g](x0) = x0 + 4, [a] = 0, [active](x0) = x0 orientation: mark(f(X)) = X + 1 >= X + 1 = active(f(mark(X))) mark(a()) = 1 >= 0 = active(a()) mark(g(X)) = X + 5 >= X + 4 = active(g(X)) f(mark(X)) = X + 1 >= X = f(X) f(active(X)) = X >= X = f(X) problem: mark(f(X)) -> active(f(mark(X))) f(active(X)) -> f(X) Matrix Interpretation Processor: dim=3 interpretation: [1 1 0] [mark](x0) = [0 1 0]x0 [0 0 0] , [1 0 0] [0] [f](x0) = [0 1 0]x0 + [1] [0 0 0] [0], [1 0 0] [active](x0) = [0 1 1]x0 [0 0 0] orientation: [1 1 0] [1] [1 1 0] [0] mark(f(X)) = [0 1 0]X + [1] >= [0 1 0]X + [1] = active(f(mark(X))) [0 0 0] [0] [0 0 0] [0] [1 0 0] [0] [1 0 0] [0] f(active(X)) = [0 1 1]X + [1] >= [0 1 0]X + [1] = f(X) [0 0 0] [0] [0 0 0] [0] problem: f(active(X)) -> f(X) Matrix Interpretation Processor: dim=3 interpretation: [1 0 0] [f](x0) = [1 0 0]x0 [0 0 0] , [1 0 0] [1] [active](x0) = [0 0 0]x0 + [0] [0 0 0] [0] orientation: [1 0 0] [1] [1 0 0] f(active(X)) = [1 0 0]X + [1] >= [1 0 0]X = f(X) [0 0 0] [0] [0 0 0] problem: Qed