YES We show the termination of the TRS R: g(x,y) -> x g(x,y) -> y f(|0|(),|1|(),x) -> f(s(x),x,x) f(x,y,s(z)) -> s(f(|0|(),|1|(),z)) -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: f#(|0|(),|1|(),x) -> f#(s(x),x,x) p2: f#(x,y,s(z)) -> f#(|0|(),|1|(),z) and R consists of: r1: g(x,y) -> x r2: g(x,y) -> y r3: f(|0|(),|1|(),x) -> f(s(x),x,x) r4: f(x,y,s(z)) -> s(f(|0|(),|1|(),z)) The estimated dependency graph contains the following SCCs: {p1, p2} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: f#(|0|(),|1|(),x) -> f#(s(x),x,x) p2: f#(x,y,s(z)) -> f#(|0|(),|1|(),z) and R consists of: r1: g(x,y) -> x r2: g(x,y) -> y r3: f(|0|(),|1|(),x) -> f(s(x),x,x) r4: f(x,y,s(z)) -> s(f(|0|(),|1|(),z)) The set of usable rules consists of r1, r2 Take the reduction pair: generalized weighted path order (>=MG, >G) base order 1: trivial reduction triple (T x T, T x T, Φ) base order 2: lexicographic combination of reduction triples: 1. marked-algebra reduction triple (>=A, >=A!, >A!): max/plus interpretation on natural numbers: f#_A(x1,x2,x3) = max{0, x1 - 13, x2 - 12, x3 - 12} |0|_A = 3 |1|_A = 11 s_A(x1) = max{10, x1 + 1} g_A(x1,x2) = max{x1, x2} f#!_A(x1,x2,x3) = max{2, x1 - 26, x2 - 22, x3 - 11} |0|!_A = 1 |1|!_A = 1 s!_A(x1) = max{3, x1 - 2} g!_A(x1,x2) = max{x1, x2} 2. marked-algebra reduction triple (>=A, >=A!, >A!): max/plus interpretation on natural numbers: f#_A(x1,x2,x3) = max{0, x1 - 17, x2 - 12, x3 - 12} |0|_A = 11 |1|_A = 11 s_A(x1) = max{10, x1 + 5} g_A(x1,x2) = max{x1, x2} f#!_A(x1,x2,x3) = max{1, x1 - 18, x2 - 20, x3 - 11} |0|!_A = 2 |1|!_A = 1 s!_A(x1) = max{3, x1 - 10} g!_A(x1,x2) = max{x1, x2} partial status: pi(f#) = [3] pi(|0|) = [] pi(|1|) = [] pi(s) = [1] pi(g) = [1, 2] The following rules are removed: p2 -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: f#(|0|(),|1|(),x) -> f#(s(x),x,x) and R consists of: r1: g(x,y) -> x r2: g(x,y) -> y r3: f(|0|(),|1|(),x) -> f(s(x),x,x) r4: f(x,y,s(z)) -> s(f(|0|(),|1|(),z)) The estimated dependency graph contains the following SCCs: (no SCCs)