YES Problem: 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)) Proof: DP Processor: DPs: f#(0(),1(),x) -> f#(s(x),x,x) f#(x,y,s(z)) -> f#(0(),1(),z) TRS: 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)) Usable Rule Processor: DPs: f#(0(),1(),x) -> f#(s(x),x,x) f#(x,y,s(z)) -> f#(0(),1(),z) TRS: Matrix Interpretation Processor: dim=4 usable rules: interpretation: [f#](x0, x1, x2) = [0 0 1 0]x0 + [0 1 0 1]x2, [0 0 0 0] [0] [1 0 0 0] [1] [s](x0) = [0 0 0 0]x0 + [0] [0 1 0 1] [1], [0] [0] [1] = [0] [0], [0] [0] [0] = [1] [0] orientation: f#(0(),1(),x) = [0 1 0 1]x + [1] >= [0 1 0 1]x = f#(s(x),x,x) f#(x,y,s(z)) = [0 0 1 0]x + [1 1 0 1]z + [2] >= [0 1 0 1]z + [1] = f#(0(),1(),z) problem: DPs: TRS: Qed