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)) Matrix Interpretation Processor: dim=3 interpretation: [f#](x0, x1, x2) = [0 1 0]x0 + [1 0 1]x2, [0 0 1] [1] [s](x0) = [0 0 0]x0 + [0] [1 0 0] [1], [0 0 1] [f](x0, x1, x2) = [0 0 0]x2 [1 0 0] , [0] [1] = [0] [0], [0] [0] = [1] [0], [1 0 1] [1 1 0] [0] [g](x0, x1) = [1 1 1]x0 + [1 1 1]x1 + [1] [0 0 1] [1 0 1] [1] orientation: f#(0(),1(),x) = [1 0 1]x + [1] >= [1 0 1]x = f#(s(x),x,x) f#(x,y,s(z)) = [0 1 0]x + [1 0 1]z + [2] >= [1 0 1]z + [1] = f#(0(),1(),z) [1 0 1] [1 1 0] [0] g(x,y) = [1 1 1]x + [1 1 1]y + [1] >= x = x [0 0 1] [1 0 1] [1] [1 0 1] [1 1 0] [0] g(x,y) = [1 1 1]x + [1 1 1]y + [1] >= y = y [0 0 1] [1 0 1] [1] [0 0 1] [0 0 1] f(0(),1(),x) = [0 0 0]x >= [0 0 0]x = f(s(x),x,x) [1 0 0] [1 0 0] [1 0 0] [1] [1 0 0] [1] f(x,y,s(z)) = [0 0 0]z + [0] >= [0 0 0]z + [0] = s(f(0(),1(),z)) [0 0 1] [1] [0 0 1] [1] problem: DPs: 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)) Qed