YES Problem: not(true()) -> false() not(false()) -> true() odd(0()) -> false() odd(s(x)) -> not(odd(x)) +(x,0()) -> x +(x,s(y)) -> s(+(x,y)) +(s(x),y) -> s(+(x,y)) Proof: Matrix Interpretation Processor: dim=1 interpretation: [+](x0, x1) = x0 + 2x1 + 5, [s](x0) = x0, [odd](x0) = x0, [0] = 6, [false] = 6, [not](x0) = x0, [true] = 6 orientation: not(true()) = 6 >= 6 = false() not(false()) = 6 >= 6 = true() odd(0()) = 6 >= 6 = false() odd(s(x)) = x >= x = not(odd(x)) +(x,0()) = x + 17 >= x = x +(x,s(y)) = x + 2y + 5 >= x + 2y + 5 = s(+(x,y)) +(s(x),y) = x + 2y + 5 >= x + 2y + 5 = s(+(x,y)) problem: not(true()) -> false() not(false()) -> true() odd(0()) -> false() odd(s(x)) -> not(odd(x)) +(x,s(y)) -> s(+(x,y)) +(s(x),y) -> s(+(x,y)) Matrix Interpretation Processor: dim=1 interpretation: [+](x0, x1) = 2x0 + x1, [s](x0) = x0 + 1, [odd](x0) = 4x0 + 2, [0] = 1, [false] = 6, [not](x0) = x0 + 4, [true] = 4 orientation: not(true()) = 8 >= 6 = false() not(false()) = 10 >= 4 = true() odd(0()) = 6 >= 6 = false() odd(s(x)) = 4x + 6 >= 4x + 6 = not(odd(x)) +(x,s(y)) = 2x + y + 1 >= 2x + y + 1 = s(+(x,y)) +(s(x),y) = 2x + y + 2 >= 2x + y + 1 = s(+(x,y)) problem: odd(0()) -> false() odd(s(x)) -> not(odd(x)) +(x,s(y)) -> s(+(x,y)) Matrix Interpretation Processor: dim=1 interpretation: [+](x0, x1) = 2x0 + 6x1 + 4, [s](x0) = x0 + 3, [odd](x0) = 4x0 + 4, [0] = 0, [false] = 4, [not](x0) = x0 orientation: odd(0()) = 4 >= 4 = false() odd(s(x)) = 4x + 16 >= 4x + 4 = not(odd(x)) +(x,s(y)) = 2x + 6y + 22 >= 2x + 6y + 7 = s(+(x,y)) problem: odd(0()) -> false() Matrix Interpretation Processor: dim=3 interpretation: [1 0 0] [1] [odd](x0) = [0 0 0]x0 + [0] [0 0 0] [0], [0] [0] = [0] [0], [0] [false] = [0] [0] orientation: [1] [0] odd(0()) = [0] >= [0] = false() [0] [0] problem: Qed