YES(?,POLY) 'Pop* with parameter subtitution (timeout of 60.0 seconds)' ----------------------------------------------------------- Answer: YES(?,POLY) Input Problem: innermost runtime-complexity with respect to Rules: { plus(x, 0()) -> x , plus(x, s(y)) -> s(plus(x, y)) , d(0()) -> 0() , d(s(x)) -> s(s(d(x))) , q(0()) -> 0() , q(s(x)) -> s(plus(q(x), d(x)))} Proof Output: The input was oriented with the instance of POP* as induced by the precedence q > plus, q > d, plus ~ d and safe mapping safe(plus) = {1}, safe(0) = {}, safe(s) = {1}, safe(d) = {}, safe(q) = {} . For your convenience, here is the input in predicative notation: Rules: { plus(0(); x) -> x , plus(s(; y); x) -> s(; plus(y; x)) , d(0();) -> 0() , d(s(; x);) -> s(; s(; d(x;))) , q(0();) -> 0() , q(s(; x);) -> s(; plus(d(x;); q(x;)))}