YES Problem: f(j(x,y),y) -> g(f(x,k(y))) f(x,h1(y,z)) -> h2(0(),x,h1(y,z)) g(h2(x,y,h1(z,u))) -> h2(s(x),y,h1(z,u)) h2(x,j(y,h1(z,u)),h1(z,u)) -> h2(s(x),y,h1(s(z),u)) i(f(x,h(y))) -> y i(h2(s(x),y,h1(x,z))) -> z k(h(x)) -> h1(0(),x) k(h1(x,y)) -> h1(s(x),y) Proof: DP Processor: DPs: f#(j(x,y),y) -> k#(y) f#(j(x,y),y) -> f#(x,k(y)) f#(j(x,y),y) -> g#(f(x,k(y))) f#(x,h1(y,z)) -> h2#(0(),x,h1(y,z)) g#(h2(x,y,h1(z,u))) -> h2#(s(x),y,h1(z,u)) h2#(x,j(y,h1(z,u)),h1(z,u)) -> h2#(s(x),y,h1(s(z),u)) TRS: f(j(x,y),y) -> g(f(x,k(y))) f(x,h1(y,z)) -> h2(0(),x,h1(y,z)) g(h2(x,y,h1(z,u))) -> h2(s(x),y,h1(z,u)) h2(x,j(y,h1(z,u)),h1(z,u)) -> h2(s(x),y,h1(s(z),u)) i(f(x,h(y))) -> y i(h2(s(x),y,h1(x,z))) -> z k(h(x)) -> h1(0(),x) k(h1(x,y)) -> h1(s(x),y) Arctic Interpretation Processor: dimension: 1 interpretation: [h2#](x0, x1, x2) = x1 + x2, [g#](x0) = x0 + 2, [k#](x0) = 1x0, [f#](x0, x1) = 4x0 + 4x1 + 0, [i](x0) = x0 + 8, [h](x0) = x0 + 0, [s](x0) = x0 + 6, [h2](x0, x1, x2) = 4x1 + 1x2, [0] = 6, [h1](x0, x1) = x1, [g](x0) = 1x0 + 0, [k](x0) = 1x0 + 0, [f](x0, x1) = 5x0 + 4x1 + 0, [j](x0, x1) = 2x0 + 2x1 + 1 orientation: f#(j(x,y),y) = 6x + 6y + 5 >= 1y = k#(y) f#(j(x,y),y) = 6x + 6y + 5 >= 4x + 5y + 4 = f#(x,k(y)) f#(j(x,y),y) = 6x + 6y + 5 >= 5x + 5y + 4 = g#(f(x,k(y))) f#(x,h1(y,z)) = 4x + 4z + 0 >= x + z = h2#(0(),x,h1(y,z)) g#(h2(x,y,h1(z,u))) = 1u + 4y + 2 >= u + y = h2#(s(x),y,h1(z,u)) h2#(x,j(y,h1(z,u)),h1(z,u)) = 2u + 2y + 1 >= u + y = h2#(s(x),y,h1(s(z),u)) f(j(x,y),y) = 7x + 7y + 6 >= 6x + 6y + 5 = g(f(x,k(y))) f(x,h1(y,z)) = 5x + 4z + 0 >= 4x + 1z = h2(0(),x,h1(y,z)) g(h2(x,y,h1(z,u))) = 2u + 5y + 0 >= 1u + 4y = h2(s(x),y,h1(z,u)) h2(x,j(y,h1(z,u)),h1(z,u)) = 6u + 6y + 5 >= 1u + 4y = h2(s(x),y,h1(s(z),u)) i(f(x,h(y))) = 5x + 4y + 8 >= y = y i(h2(s(x),y,h1(x,z))) = 4y + 1z + 8 >= z = z k(h(x)) = 1x + 1 >= x = h1(0(),x) k(h1(x,y)) = 1y + 0 >= y = h1(s(x),y) problem: DPs: TRS: f(j(x,y),y) -> g(f(x,k(y))) f(x,h1(y,z)) -> h2(0(),x,h1(y,z)) g(h2(x,y,h1(z,u))) -> h2(s(x),y,h1(z,u)) h2(x,j(y,h1(z,u)),h1(z,u)) -> h2(s(x),y,h1(s(z),u)) i(f(x,h(y))) -> y i(h2(s(x),y,h1(x,z))) -> z k(h(x)) -> h1(0(),x) k(h1(x,y)) -> h1(s(x),y) Qed