YES(O(1),O(n^2)) We are left with following problem, upon which TcT provides the certificate YES(O(1),O(n^2)). Strict Trs: { f(g(x), y, y) -> g(f(x, x, y)) } Obligation: innermost runtime complexity Answer: YES(O(1),O(n^2)) We use the processor 'custom shape polynomial interpretation' to orient following rules strictly. Trs: { f(g(x), y, y) -> g(f(x, x, y)) } The induced complexity on above rules (modulo remaining rules) is YES(?,O(n^2)) . These rules are moved into the corresponding weak component(s). Sub-proof: ---------- TcT has computed the following constructor-restricted polynomial interpretation. [f](x1, x2, x3) = 1 + 2*x1 + 2*x1^2 + 2*x2 + 2*x3 [g](x1) = 1 + x1 This order satisfies the following ordering constraints. [f(g(x), y, y)] = 5 + 6*x + 2*x^2 + 4*y > 2 + 4*x + 2*x^2 + 2*y = [g(f(x, x, y))] 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: { f(g(x), y, y) -> g(f(x, x, y)) } Obligation: innermost runtime complexity Answer: YES(O(1),O(1)) Empty rules are trivially bounded Hurray, we answered YES(O(1),O(n^2))