MAYBE We are left with following problem, upon which TcT provides the certificate MAYBE. Strict Trs: { division(x, y) -> div(x, y, 0()) , div(x, y, z) -> if(lt(x, y), x, y, inc(z)) , if(true(), x, y, z) -> z , if(false(), x, s(y), z) -> div(minus(x, s(y)), s(y), z) , lt(x, 0()) -> false() , lt(0(), s(y)) -> true() , lt(s(x), s(y)) -> lt(x, y) , inc(0()) -> s(0()) , inc(s(x)) -> s(inc(x)) , minus(x, 0()) -> x , minus(s(x), s(y)) -> minus(x, y) } Obligation: innermost runtime complexity Answer: MAYBE The input cannot be shown compatible Arrrr..