YES TRS: f(0()) -> 1() f(s(x)) -> g(f(x)) g(x) -> +(x,s(x)) f(s(x)) -> +(f(x),s(f(x))) linear polynomial interpretations on N: f_A(x1) = x1 + 1 f#_A(x1) = x1 + 3 0_A = 1 0#_A = 1 1_A = 0 1#_A = 0 s_A(x1) = x1 + 1 s#_A(x1) = 1 g_A(x1) = 0 g#_A(x1) = x1 + 2 +_A(x1,x2) = 0 +#_A(x1,x2) = x2 precedence: + > f > 1 = g > 0 = s