TRS: { from(X) -> cons(X, n__from(s(X))), 2ndspos(0(), Z) -> rnil(), 2ndspos(s(N), cons(X, Z)) -> 2ndspos(s(N), cons2(X, activate(Z))), 2ndspos(s(N), cons2(X, cons(Y, Z))) -> rcons(posrecip(Y), 2ndsneg(N, activate(Z))), 2ndsneg(0(), Z) -> rnil(), 2ndsneg(s(N), cons(X, Z)) -> 2ndsneg(s(N), cons2(X, activate(Z))), 2ndsneg(s(N), cons2(X, cons(Y, Z))) -> rcons(negrecip(Y), 2ndspos(N, activate(Z))), pi(X) -> 2ndspos(X, from(0())), plus(0(), Y) -> Y, plus(s(X), Y) -> s(plus(X, Y)), times(0(), Y) -> 0(), times(s(X), Y) -> plus(Y, times(X, Y)), square(X) -> times(X, X), from(X) -> n__from(X), activate(n__from(X)) -> from(X), activate(X) -> X} Fail