YES We show the termination of the TRS R: g(f(x,y),z) -> f(x,g(y,z)) g(h(x,y),z) -> g(x,f(y,z)) g(x,h(y,z)) -> h(g(x,y),z) -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: g#(f(x,y),z) -> g#(y,z) p2: g#(h(x,y),z) -> g#(x,f(y,z)) p3: g#(x,h(y,z)) -> g#(x,y) and R consists of: r1: g(f(x,y),z) -> f(x,g(y,z)) r2: g(h(x,y),z) -> g(x,f(y,z)) r3: g(x,h(y,z)) -> h(g(x,y),z) The estimated dependency graph contains the following SCCs: {p1, p2, p3} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: g#(f(x,y),z) -> g#(y,z) p2: g#(x,h(y,z)) -> g#(x,y) p3: g#(h(x,y),z) -> g#(x,f(y,z)) and R consists of: r1: g(f(x,y),z) -> f(x,g(y,z)) r2: g(h(x,y),z) -> g(x,f(y,z)) r3: g(x,h(y,z)) -> h(g(x,y),z) The set of usable rules consists of (no rules) Take the reduction pair: max/plus interpretations on natural numbers: g#_A(x1,x2) = x1 + 3 f_A(x1,x2) = max{x1, x2 + 1} h_A(x1,x2) = max{x1, x2} The next rules are strictly ordered: p1 We remove them from the problem. -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: g#(x,h(y,z)) -> g#(x,y) p2: g#(h(x,y),z) -> g#(x,f(y,z)) and R consists of: r1: g(f(x,y),z) -> f(x,g(y,z)) r2: g(h(x,y),z) -> g(x,f(y,z)) r3: g(x,h(y,z)) -> h(g(x,y),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: g#(x,h(y,z)) -> g#(x,y) and R consists of: r1: g(f(x,y),z) -> f(x,g(y,z)) r2: g(h(x,y),z) -> g(x,f(y,z)) r3: g(x,h(y,z)) -> h(g(x,y),z) The set of usable rules consists of (no rules) Take the reduction pair: max/plus interpretations on natural numbers: g#_A(x1,x2) = x2 h_A(x1,x2) = max{x1 + 1, x2 + 1} The next rules are strictly ordered: p1 We remove them from the problem. Then no dependency pair remains. -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: g#(h(x,y),z) -> g#(x,f(y,z)) and R consists of: r1: g(f(x,y),z) -> f(x,g(y,z)) r2: g(h(x,y),z) -> g(x,f(y,z)) r3: g(x,h(y,z)) -> h(g(x,y),z) The set of usable rules consists of (no rules) Take the reduction pair: max/plus interpretations on natural numbers: g#_A(x1,x2) = max{2, x1, x2} h_A(x1,x2) = max{x1 + 3, x2 + 3} f_A(x1,x2) = max{1, x1, x2 - 1} The next rules are strictly ordered: p1 We remove them from the problem. Then no dependency pair remains.