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: [odd](x0) = x0 + 2, [not](x0) = x0, [0] = 2, [s](x0) = x0, [true] = 4, [+](x0, x1) = x0 + x1 + 7, [false] = 4 orientation: not(true()) = 4 >= 4 = false() not(false()) = 4 >= 4 = true() odd(0()) = 4 >= 4 = false() odd(s(x)) = x + 2 >= x + 2 = not(odd(x)) +(x,0()) = x + 9 >= x = x +(x,s(y)) = x + y + 7 >= x + y + 7 = s(+(x,y)) +(s(x),y) = x + y + 7 >= x + y + 7 = 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: [odd](x0) = x0 + 4, [not](x0) = x0, [0] = 2, [s](x0) = x0, [true] = 0, [+](x0, x1) = x0 + 4x1 + 4, [false] = 0 orientation: not(true()) = 0 >= 0 = false() not(false()) = 0 >= 0 = true() odd(0()) = 6 >= 0 = false() odd(s(x)) = x + 4 >= x + 4 = not(odd(x)) +(x,s(y)) = x + 4y + 4 >= x + 4y + 4 = s(+(x,y)) +(s(x),y) = x + 4y + 4 >= x + 4y + 4 = s(+(x,y)) problem: not(true()) -> false() not(false()) -> true() odd(s(x)) -> not(odd(x)) +(x,s(y)) -> s(+(x,y)) +(s(x),y) -> s(+(x,y)) Matrix Interpretation Processor: dim=3 interpretation: [1 1 1] [odd](x0) = [1 1 1]x0 [0 0 0] , [1 0 1] [not](x0) = [1 0 0]x0 [0 0 1] , [1 0 0] [0] [s](x0) = [0 0 1]x0 + [0] [0 1 0] [1], [0] [true] = [0] [1], [1 1 1] [1 1 1] [+](x0, x1) = [0 1 1]x0 + [0 1 1]x1 [0 1 1] [0 1 1] , [0] [false] = [0] [1] orientation: [1] [0] not(true()) = [0] >= [0] = false() [1] [1] [1] [0] not(false()) = [0] >= [0] = true() [1] [1] [1 1 1] [1] [1 1 1] odd(s(x)) = [1 1 1]x + [1] >= [1 1 1]x = not(odd(x)) [0 0 0] [0] [0 0 0] [1 1 1] [1 1 1] [1] [1 1 1] [1 1 1] [0] +(x,s(y)) = [0 1 1]x + [0 1 1]y + [1] >= [0 1 1]x + [0 1 1]y + [0] = s(+(x,y)) [0 1 1] [0 1 1] [1] [0 1 1] [0 1 1] [1] [1 1 1] [1 1 1] [1] [1 1 1] [1 1 1] [0] +(s(x),y) = [0 1 1]x + [0 1 1]y + [1] >= [0 1 1]x + [0 1 1]y + [0] = s(+(x,y)) [0 1 1] [0 1 1] [1] [0 1 1] [0 1 1] [1] problem: Qed