YES(O(1),O(n^1)) We are left with following problem, upon which TcT provides the certificate YES(O(1),O(n^1)). Strict Trs: { norm(nil()) -> 0() , norm(g(x, y)) -> s(norm(x)) , f(x, nil()) -> g(nil(), x) , f(x, g(y, z)) -> g(f(x, y), z) , rem(nil(), y) -> nil() , rem(g(x, y), 0()) -> g(x, y) , rem(g(x, y), s(z)) -> rem(x, z) } Obligation: innermost runtime complexity Answer: YES(O(1),O(n^1)) We use the processor 'Small Polynomial Path Order (PS,1-bounded)' to orient following rules strictly. Trs: { norm(nil()) -> 0() , norm(g(x, y)) -> s(norm(x)) , f(x, nil()) -> g(nil(), x) , f(x, g(y, z)) -> g(f(x, y), z) , rem(nil(), y) -> nil() , rem(g(x, y), 0()) -> g(x, y) , rem(g(x, y), s(z)) -> rem(x, z) } The induced complexity on above rules (modulo remaining rules) is YES(?,O(n^1)) . These rules are moved into the corresponding weak component(s). Sub-proof: ---------- The input was oriented with the instance of 'Small Polynomial Path Order (PS,1-bounded)' as induced by the safe mapping safe(norm) = {}, safe(nil) = {}, safe(0) = {}, safe(g) = {1, 2}, safe(s) = {1}, safe(f) = {}, safe(rem) = {2} and precedence norm ~ f, norm ~ rem, f ~ rem . Following symbols are considered recursive: {norm, f, rem} The recursion depth is 1. For your convenience, here are the satisfied ordering constraints: norm(nil();) > 0() norm(g(; x, y);) > s(; norm(x;)) f(x, nil();) > g(; nil(), x) f(x, g(; y, z);) > g(; f(x, y;), z) rem(nil(); y) > nil() rem(g(; x, y); 0()) > g(; x, y) rem(g(; x, y); s(; z)) > rem(x; z) We return to the main proof. We are left with following problem, upon which TcT provides the certificate YES(O(1),O(1)). Weak Trs: { norm(nil()) -> 0() , norm(g(x, y)) -> s(norm(x)) , f(x, nil()) -> g(nil(), x) , f(x, g(y, z)) -> g(f(x, y), z) , rem(nil(), y) -> nil() , rem(g(x, y), 0()) -> g(x, y) , rem(g(x, y), s(z)) -> rem(x, z) } Obligation: innermost runtime complexity Answer: YES(O(1),O(1)) Empty rules are trivially bounded Hurray, we answered YES(O(1),O(n^1))