YES Problem: f(0()) -> cons(0()) f(s(0())) -> f(p(s(0()))) p(s(X)) -> X Proof: Matrix Interpretation Processor: dim=3 interpretation: [1 0 0] [p](x0) = [1 1 0]x0 [0 0 1] , [1 0 1] [0] [f](x0) = [0 0 0]x0 + [1] [0 0 0] [0], [1 1 0] [0] [s](x0) = [0 0 0]x0 + [1] [0 0 1] [0], [0] [0] = [0] [1], [1 0 0] [0] [cons](x0) = [0 0 0]x0 + [1] [0 0 0] [0] orientation: [1] [0] f(0()) = [1] >= [1] = cons(0()) [0] [0] [1] [1] f(s(0())) = [1] >= [1] = f(p(s(0()))) [0] [0] [1 1 0] [0] p(s(X)) = [1 1 0]X + [1] >= X = X [0 0 1] [0] problem: f(s(0())) -> f(p(s(0()))) p(s(X)) -> X Matrix Interpretation Processor: dim=3 interpretation: [1 0 0] [p](x0) = [0 0 1]x0 [0 1 0] , [1 0 1] [f](x0) = [0 0 1]x0 [0 0 0] , [1 0 0] [0] [s](x0) = [0 0 1]x0 + [0] [0 1 0] [1], [0] [0] = [0] [0] orientation: [1] [0] f(s(0())) = [1] >= [0] = f(p(s(0()))) [0] [0] [0] p(s(X)) = X + [1] >= X = X [0] problem: p(s(X)) -> X Matrix Interpretation Processor: dim=3 interpretation: [1] [p](x0) = x0 + [0] [0], [0] [s](x0) = x0 + [1] [0] orientation: [1] p(s(X)) = X + [1] >= X = X [0] problem: Qed