YES Problem: 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: 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 0 1]x0 + [1 1 0]x2 + [1], [1 0 1] [1] [s](x0) = [0 1 0]x0 + [1] [0 0 0] [0], [0 0 0] [0 1 0] [1] [f](x0, x1, x2) = [0 0 1]x0 + [1 1 1]x2 + [0] [0 0 0] [0 0 0] [0], [0] [1] = [0] [0], [0] [0] = [0] [1] orientation: f#(0(),1(),x) = [1 1 0]x + [2] >= [1 1 0]x + [1] = f#(s(x),x,x) f#(x,y,s(z)) = [0 0 1]x + [1 1 1]z + [3] >= [1 1 0]z + [2] = f#(0(),1(),z) [0 1 0] [1] [0 1 0] [1] f(0(),1(),x) = [1 1 1]x + [1] >= [1 1 1]x + [0] = f(s(x),x,x) [0 0 0] [0] [0 0 0] [0] [0 0 0] [0 1 0] [2] [0 1 0] [2] f(x,y,s(z)) = [0 0 1]x + [1 1 1]z + [2] >= [1 1 1]z + [2] = s(f(0(),1(),z)) [0 0 0] [0 0 0] [0] [0 0 0] [0] problem: DPs: TRS: f(0(),1(),x) -> f(s(x),x,x) f(x,y,s(z)) -> s(f(0(),1(),z)) Qed