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: { f(c(X, s(Y))) -> f(c(s(X), Y)) , g(c(s(X), Y)) -> f(c(X, s(Y))) } Obligation: innermost runtime complexity Answer: YES(O(1),O(n^1)) We add following weak dependency pairs: Strict DPs: { f^#(c(X, s(Y))) -> c_1(f^#(c(s(X), Y))) , g^#(c(s(X), Y)) -> c_2(f^#(c(X, s(Y)))) } and mark the set of starting terms. We are left with following problem, upon which TcT provides the certificate YES(O(1),O(n^1)). Strict DPs: { f^#(c(X, s(Y))) -> c_1(f^#(c(s(X), Y))) , g^#(c(s(X), Y)) -> c_2(f^#(c(X, s(Y)))) } Strict Trs: { f(c(X, s(Y))) -> f(c(s(X), Y)) , g(c(s(X), Y)) -> f(c(X, s(Y))) } Obligation: innermost runtime complexity Answer: YES(O(1),O(n^1)) No rule is usable, rules are removed from the input problem. We are left with following problem, upon which TcT provides the certificate YES(O(1),O(n^1)). Strict DPs: { f^#(c(X, s(Y))) -> c_1(f^#(c(s(X), Y))) , g^#(c(s(X), Y)) -> c_2(f^#(c(X, s(Y)))) } Obligation: innermost runtime complexity Answer: YES(O(1),O(n^1)) The weightgap principle applies (using the following constant growth matrix-interpretation) The following argument positions are usable: Uargs(c_1) = {1}, Uargs(c_2) = {1} TcT has computed following constructor-restricted matrix interpretation. [c](x1, x2) = [0] [s](x1) = [1] x1 + [0] [f^#](x1) = [0] [c_1](x1) = [1] x1 + [1] [g^#](x1) = [1] [c_2](x1) = [1] x1 + [0] This order satisfies following ordering constraints: Further, it can be verified that all rules not oriented are covered by the weightgap condition. We are left with following problem, upon which TcT provides the certificate YES(?,O(n^1)). Strict DPs: { f^#(c(X, s(Y))) -> c_1(f^#(c(s(X), Y))) } Weak DPs: { g^#(c(s(X), Y)) -> c_2(f^#(c(X, s(Y)))) } Obligation: innermost runtime complexity Answer: YES(?,O(n^1)) Consider the dependency graph 1: f^#(c(X, s(Y))) -> c_1(f^#(c(s(X), Y))) -->_1 f^#(c(X, s(Y))) -> c_1(f^#(c(s(X), Y))) :1 2: g^#(c(s(X), Y)) -> c_2(f^#(c(X, s(Y)))) -->_1 f^#(c(X, s(Y))) -> c_1(f^#(c(s(X), Y))) :1 Following roots of the dependency graph are removed, as the considered set of starting terms is closed under reduction with respect to these rules (modulo compound contexts). { g^#(c(s(X), Y)) -> c_2(f^#(c(X, s(Y)))) } We are left with following problem, upon which TcT provides the certificate YES(?,O(n^1)). Strict DPs: { f^#(c(X, s(Y))) -> c_1(f^#(c(s(X), Y))) } Obligation: innermost runtime complexity Answer: YES(?,O(n^1)) The input was oriented with the instance of 'Small Polynomial Path Order (PS)' as induced by the safe mapping safe(c) = {1, 2}, safe(s) = {1}, safe(f^#) = {}, safe(c_1) = {} and precedence empty . Following symbols are considered recursive: {f^#} The recursion depth is 1. Further, following argument filtering is employed: pi(c) = 2, pi(s) = [1], pi(f^#) = [1], pi(c_1) = [1] Usable defined function symbols are a subset of: {f^#} For your convenience, here are the satisfied ordering constraints: pi(f^#(c(X, s(Y)))) = f^#(s(; Y);) > c_1(f^#(Y;);) = pi(c_1(f^#(c(s(X), Y)))) Hurray, we answered YES(O(1),O(n^1))