YES TRS: a__f(0()) -> cons(0(),f(s(0()))) a__f(s(0())) -> a__f(a__p(s(0()))) a__p(s(0())) -> 0() mark(f(X)) -> a__f(mark(X)) mark(p(X)) -> a__p(mark(X)) mark(0()) -> 0() mark(cons(X1,X2)) -> cons(mark(X1),X2) mark(s(X)) -> s(mark(X)) a__f(X) -> f(X) a__p(X) -> p(X) max/plus interpretations on N: a__f_A(x1) = max{1, 10} a__f#_A(x1) = max{10, 5 + x1} 0_A = 1 0#_A = 26 cons_A(x1,x2) = max{1, -1, -1} cons#_A(x1,x2) = max{7, 8, 9} f_A(x1) = max{10, 10} f#_A(x1) = max{10, 10} s_A(x1) = max{6, 9} s#_A(x1) = max{10, 10} a__p_A(x1) = max{4, -4} a__p#_A(x1) = max{1, 3 + x1} mark_A(x1) = max{10, -4} mark#_A(x1) = max{25, 16} p_A(x1) = max{4, -1} p#_A(x1) = max{0, 2 + x1} precedence: p > mark > 0 > a__f > cons = f = s > a__p