MAYBE We are left with following problem, upon which TcT provides the certificate MAYBE. Strict Trs: { *(X, +(Y, 1())) -> +(*(X, +(Y, *(1(), 0()))), X) , *(X, 1()) -> X , *(X, 0()) -> X , *(X, 0()) -> 0() } Obligation: innermost runtime complexity Answer: MAYBE The input cannot be shown compatible Arrrr..