NO Problem: zeros() -> cons(0(),n__zeros()) and(tt(),X) -> activate(X) length(nil()) -> 0() length(cons(N,L)) -> s(length(activate(L))) zeros() -> n__zeros() activate(n__zeros()) -> zeros() activate(X) -> X Proof: Matrix Interpretation Processor: dim=3 interpretation: [0] [tt] = [0] [0], [1 0 0] [length](x0) = [1 1 0]x0 [0 0 0] , [0] [0] = [0] [0], [1 0 0] [1 0 1] [cons](x0, x1) = [0 0 0]x0 + [0 0 0]x1 [0 0 0] [0 0 0] , [1 0 0] [1 1 1] [1] [and](x0, x1) = [0 0 0]x0 + [1 1 0]x1 + [0] [0 0 0] [0 0 1] [1], [1] [zeros] = [0] [0], [0] [nil] = [0] [0], [1 0 0] [s](x0) = [0 0 0]x0 [0 0 0] , [1 0 1] [0] [activate](x0) = [0 1 0]x0 + [0] [0 0 1] [1], [1] [n__zeros] = [0] [0] orientation: [1] [1] zeros() = [0] >= [0] = cons(0(),n__zeros()) [0] [0] [1 1 1] [1] [1 0 1] [0] and(tt(),X) = [1 1 0]X + [0] >= [0 1 0]X + [0] = activate(X) [0 0 1] [1] [0 0 1] [1] [0] [0] length(nil()) = [0] >= [0] = 0() [0] [0] [1 0 1] [1 0 0] [1 0 1] length(cons(N,L)) = [1 0 1]L + [1 0 0]N >= [0 0 0]L = s(length(activate(L))) [0 0 0] [0 0 0] [0 0 0] [1] [1] zeros() = [0] >= [0] = n__zeros() [0] [0] [1] [1] activate(n__zeros()) = [0] >= [0] = zeros() [1] [0] [1 0 1] [0] activate(X) = [0 1 0]X + [0] >= X = X [0 0 1] [1] problem: zeros() -> cons(0(),n__zeros()) length(nil()) -> 0() length(cons(N,L)) -> s(length(activate(L))) zeros() -> n__zeros() activate(n__zeros()) -> zeros() activate(X) -> X Matrix Interpretation Processor: dim=1 interpretation: [length](x0) = 2x0, [0] = 0, [cons](x0, x1) = 2x0 + x1, [zeros] = 0, [nil] = 2, [s](x0) = x0, [activate](x0) = x0, [n__zeros] = 0 orientation: zeros() = 0 >= 0 = cons(0(),n__zeros()) length(nil()) = 4 >= 0 = 0() length(cons(N,L)) = 2L + 4N >= 2L = s(length(activate(L))) zeros() = 0 >= 0 = n__zeros() activate(n__zeros()) = 0 >= 0 = zeros() activate(X) = X >= X = X problem: zeros() -> cons(0(),n__zeros()) length(cons(N,L)) -> s(length(activate(L))) zeros() -> n__zeros() activate(n__zeros()) -> zeros() activate(X) -> X Matrix Interpretation Processor: dim=3 interpretation: [length](x0) = x0 , [0] [0] = [0] [0], [1 0 0] [1 0 1] [1] [cons](x0, x1) = [1 0 0]x0 + [1 1 0]x1 + [0] [0 0 0] [1 0 0] [0], [1] [zeros] = [1] [0], [1 0 0] [s](x0) = [0 1 0]x0 [0 0 0] , [1 0 0] [1] [activate](x0) = [1 1 0]x0 + [0] [0 0 1] [1], [0] [n__zeros] = [1] [0] orientation: [1] [1] zeros() = [1] >= [1] = cons(0(),n__zeros()) [0] [0] [1 0 1] [1 0 0] [1] [1 0 0] [1] length(cons(N,L)) = [1 1 0]L + [1 0 0]N + [0] >= [1 1 0]L + [0] = s(length(activate(L))) [1 0 0] [0 0 0] [0] [0 0 0] [0] [1] [0] zeros() = [1] >= [1] = n__zeros() [0] [0] [1] [1] activate(n__zeros()) = [1] >= [1] = zeros() [1] [0] [1 0 0] [1] activate(X) = [1 1 0]X + [0] >= X = X [0 0 1] [1] problem: zeros() -> cons(0(),n__zeros()) length(cons(N,L)) -> s(length(activate(L))) activate(n__zeros()) -> zeros() Unfolding Processor: loop length: 3 terms: length(cons(N,n__zeros())) s(length(activate(n__zeros()))) s(length(zeros())) context: s([]) substitution: N -> 0() Qed