YES TRS: terms(N) -> cons(recip(sqr(N))) sqr(0()) -> 0() sqr(s(X)) -> s(add(sqr(X),dbl(X))) dbl(0()) -> 0() dbl(s(X)) -> s(s(dbl(X))) add(0(),X) -> X add(s(X),Y) -> s(add(X,Y)) first(0(),X) -> nil() first(s(X),cons(Y)) -> cons(Y) max/plus interpretations on N: terms_A(x1) = max{8, 6 + x1} terms#_A(x1) = max{8, 6 + x1} cons_A(x1) = max{8, x1} cons#_A(x1) = max{8, x1} recip_A(x1) = max{8, 1 + x1} recip#_A(x1) = max{8, 1 + x1} sqr_A(x1) = max{7, 3 + x1} sqr#_A(x1) = max{7, 3 + x1} 0_A = 1 0#_A = 1 s_A(x1) = max{2, x1} s#_A(x1) = max{2, x1} add_A(x1,x2) = max{7, x1, 1 + x2} add#_A(x1,x2) = max{7, x1, 1 + x2} dbl_A(x1) = max{6, 1 + x1} dbl#_A(x1) = max{6, 1 + x1} first_A(x1,x2) = max{9, 9 + x1, 9 + x2} first#_A(x1,x2) = max{9, 9 + x1, 9 + x2} nil_A = 0 nil#_A = 0 precedence: terms = 0 > recip = sqr = nil > add = dbl = first > cons = s