YES Problem: +(x,0()) -> x +(x,s(y)) -> s(+(x,y)) +(0(),y) -> y +(s(x),y) -> s(+(x,y)) +(x,+(y,z)) -> +(+(x,y),z) f(g(f(x))) -> f(h(s(0()),x)) f(g(h(x,y))) -> f(h(s(x),y)) f(h(x,h(y,z))) -> f(h(+(x,y),z)) Proof: Matrix Interpretation Processor: dim=1 interpretation: [h](x0, x1) = 4x0 + x1, [g](x0) = x0 + 3, [f](x0) = 4x0 + 1, [s](x0) = x0, [+](x0, x1) = x0 + x1, [0] = 0 orientation: +(x,0()) = x >= x = x +(x,s(y)) = x + y >= x + y = s(+(x,y)) +(0(),y) = y >= y = y +(s(x),y) = x + y >= x + y = s(+(x,y)) +(x,+(y,z)) = x + y + z >= x + y + z = +(+(x,y),z) f(g(f(x))) = 16x + 17 >= 4x + 1 = f(h(s(0()),x)) f(g(h(x,y))) = 16x + 4y + 13 >= 16x + 4y + 1 = f(h(s(x),y)) f(h(x,h(y,z))) = 16x + 16y + 4z + 1 >= 16x + 16y + 4z + 1 = f(h(+(x,y),z)) problem: +(x,0()) -> x +(x,s(y)) -> s(+(x,y)) +(0(),y) -> y +(s(x),y) -> s(+(x,y)) +(x,+(y,z)) -> +(+(x,y),z) f(h(x,h(y,z))) -> f(h(+(x,y),z)) Matrix Interpretation Processor: dim=1 interpretation: [h](x0, x1) = 2x0 + x1, [f](x0) = x0 + 4, [s](x0) = x0, [+](x0, x1) = x0 + x1, [0] = 1 orientation: +(x,0()) = x + 1 >= x = x +(x,s(y)) = x + y >= x + y = s(+(x,y)) +(0(),y) = y + 1 >= y = y +(s(x),y) = x + y >= x + y = s(+(x,y)) +(x,+(y,z)) = x + y + z >= x + y + z = +(+(x,y),z) f(h(x,h(y,z))) = 2x + 2y + z + 4 >= 2x + 2y + z + 4 = f(h(+(x,y),z)) problem: +(x,s(y)) -> s(+(x,y)) +(s(x),y) -> s(+(x,y)) +(x,+(y,z)) -> +(+(x,y),z) f(h(x,h(y,z))) -> f(h(+(x,y),z)) Matrix Interpretation Processor: dim=1 interpretation: [h](x0, x1) = 4x0 + 4x1 + 2, [f](x0) = x0 + 4, [s](x0) = x0, [+](x0, x1) = x0 + 4x1 + 2 orientation: +(x,s(y)) = x + 4y + 2 >= x + 4y + 2 = s(+(x,y)) +(s(x),y) = x + 4y + 2 >= x + 4y + 2 = s(+(x,y)) +(x,+(y,z)) = x + 4y + 16z + 10 >= x + 4y + 4z + 4 = +(+(x,y),z) f(h(x,h(y,z))) = 4x + 16y + 16z + 14 >= 4x + 16y + 4z + 14 = f(h(+(x,y),z)) problem: +(x,s(y)) -> s(+(x,y)) +(s(x),y) -> s(+(x,y)) f(h(x,h(y,z))) -> f(h(+(x,y),z)) Matrix Interpretation Processor: dim=1 interpretation: [h](x0, x1) = x0 + 4x1 + 1, [f](x0) = x0 + 2, [s](x0) = x0, [+](x0, x1) = x0 + 4x1 + 3 orientation: +(x,s(y)) = x + 4y + 3 >= x + 4y + 3 = s(+(x,y)) +(s(x),y) = x + 4y + 3 >= x + 4y + 3 = s(+(x,y)) f(h(x,h(y,z))) = x + 4y + 16z + 7 >= x + 4y + 4z + 6 = f(h(+(x,y),z)) problem: +(x,s(y)) -> s(+(x,y)) +(s(x),y) -> s(+(x,y)) Matrix Interpretation Processor: dim=1 interpretation: [s](x0) = x0 + 1, [+](x0, x1) = 4x0 + x1 + 3 orientation: +(x,s(y)) = 4x + y + 4 >= 4x + y + 4 = s(+(x,y)) +(s(x),y) = 4x + y + 7 >= 4x + y + 4 = s(+(x,y)) problem: +(x,s(y)) -> s(+(x,y)) Matrix Interpretation Processor: dim=3 interpretation: [1 0 0] [0] [s](x0) = [0 0 0]x0 + [1] [0 1 1] [0], [1 0 0] [1 1 1] [+](x0, x1) = [0 0 0]x0 + [0 1 0]x1 [1 0 0] [0 0 1] orientation: [1 0 0] [1 1 1] [1] [1 0 0] [1 1 1] [0] +(x,s(y)) = [0 0 0]x + [0 0 0]y + [1] >= [0 0 0]x + [0 0 0]y + [1] = s(+(x,y)) [1 0 0] [0 1 1] [0] [1 0 0] [0 1 1] [0] problem: Qed