YES Problem: active(c()) -> mark(f(g(c()))) active(f(g(X))) -> mark(g(X)) mark(c()) -> active(c()) mark(f(X)) -> active(f(X)) 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=1 interpretation: [mark](x0) = x0 + 4, [active](x0) = x0 + 4, [f](x0) = x0, [c] = 0, [g](x0) = x0 orientation: active(c()) = 4 >= 4 = mark(f(g(c()))) active(f(g(X))) = X + 4 >= X + 4 = mark(g(X)) mark(c()) = 4 >= 4 = active(c()) mark(f(X)) = X + 4 >= X + 4 = active(f(X)) mark(g(X)) = X + 4 >= X + 4 = active(g(X)) f(mark(X)) = X + 4 >= X = f(X) f(active(X)) = X + 4 >= X = f(X) g(mark(X)) = X + 4 >= X = g(X) g(active(X)) = X + 4 >= X = g(X) problem: active(c()) -> mark(f(g(c()))) active(f(g(X))) -> mark(g(X)) mark(c()) -> active(c()) mark(f(X)) -> active(f(X)) mark(g(X)) -> active(g(X)) Matrix Interpretation Processor: dim=3 interpretation: [1 0 1] [mark](x0) = [0 0 0]x0 [0 1 0] , [1 0 1] [active](x0) = [0 0 0]x0 [0 1 0] , [1 0 0] [f](x0) = [0 1 0]x0 [0 0 0] , [0] [c] = [0] [1], [1 0 0] [g](x0) = [1 0 0]x0 [0 0 0] orientation: [1] [0] active(c()) = [0] >= [0] = mark(f(g(c()))) [0] [0] [1 0 0] [1 0 0] active(f(g(X))) = [0 0 0]X >= [0 0 0]X = mark(g(X)) [1 0 0] [1 0 0] [1] [1] mark(c()) = [0] >= [0] = active(c()) [0] [0] [1 0 0] [1 0 0] mark(f(X)) = [0 0 0]X >= [0 0 0]X = active(f(X)) [0 1 0] [0 1 0] [1 0 0] [1 0 0] mark(g(X)) = [0 0 0]X >= [0 0 0]X = active(g(X)) [1 0 0] [1 0 0] problem: active(f(g(X))) -> mark(g(X)) mark(c()) -> active(c()) mark(f(X)) -> active(f(X)) mark(g(X)) -> active(g(X)) Matrix Interpretation Processor: dim=1 interpretation: [mark](x0) = 4x0 + 4, [active](x0) = 2x0, [f](x0) = 4x0 + 2, [c] = 0, [g](x0) = 2x0 orientation: active(f(g(X))) = 16X + 4 >= 8X + 4 = mark(g(X)) mark(c()) = 4 >= 0 = active(c()) mark(f(X)) = 16X + 12 >= 8X + 4 = active(f(X)) mark(g(X)) = 8X + 4 >= 4X = active(g(X)) problem: active(f(g(X))) -> mark(g(X)) Matrix Interpretation Processor: dim=3 interpretation: [1 0 0] [0] [mark](x0) = [0 0 0]x0 + [0] [0 0 0] [1], [1 0 1] [active](x0) = [0 0 0]x0 [0 0 1] , [1 0 0] [0] [f](x0) = [0 0 0]x0 + [0] [0 0 0] [1], [1 0 0] [g](x0) = [0 0 0]x0 [0 0 0] orientation: [1 0 0] [1] [1 0 0] [0] active(f(g(X))) = [0 0 0]X + [0] >= [0 0 0]X + [0] = mark(g(X)) [0 0 0] [1] [0 0 0] [1] problem: Qed