YES TRS: f(X) -> cons(X,n__f(g(X))) g(0()) -> s(0()) g(s(X)) -> s(s(g(X))) sel(0(),cons(X,Y)) -> X sel(s(X),cons(Y,Z)) -> sel(X,activate(Z)) f(X) -> n__f(X) activate(n__f(X)) -> f(X) activate(X) -> X max/plus interpretations on N: f_A(x1) = max{3, 2 + x1} f#_A(x1) = max{4, 1} cons_A(x1,x2) = max{2, 2 + x1, 1 + x2} cons#_A(x1,x2) = max{0, 2, 2} n__f_A(x1) = max{1, 1 + x1} n__f#_A(x1) = max{0, 2} g_A(x1) = max{1, -4 + x1} g#_A(x1) = max{2, 4} 0_A = 1 0#_A = 3 s_A(x1) = max{0, -2} s#_A(x1) = max{3, 1} sel_A(x1,x2) = max{3, 0, x2} sel#_A(x1,x2) = max{6, 8, 7} activate_A(x1) = max{3, 1 + x1} activate#_A(x1) = max{3, 5} precedence: cons = sel > activate > f > n__f = g > 0 = s