YES Problem: f(0()) -> s(0()) f(s(0())) -> s(s(0())) f(s(0())) -> *(s(s(0())),f(0())) f(+(x,s(0()))) -> +(s(s(0())),f(x)) f(+(x,y)) -> *(f(x),f(y)) Proof: Matrix Interpretation Processor: dim=3 interpretation: [1 1 0] [1 1 1] [+](x0, x1) = [0 1 0]x0 + [0 0 0]x1 [0 0 1] [0 0 0] , [1 1 0] [1 0 0] [*](x0, x1) = [0 1 0]x0 + [0 0 0]x1 [0 0 0] [0 0 0] , [1 0 0] [0] [s](x0) = [0 0 0]x0 + [0] [0 0 0] [1], [1 0 1] [0] [f](x0) = [0 1 0]x0 + [0] [0 0 0] [1], [0] [0] = [0] [1] orientation: [1] [0] f(0()) = [0] >= [0] = s(0()) [1] [1] [1] [0] f(s(0())) = [0] >= [0] = s(s(0())) [1] [1] [1] [1] f(s(0())) = [0] >= [0] = *(s(s(0())),f(0())) [1] [0] [1 1 1] [1] [1 1 1] [1] f(+(x,s(0()))) = [0 1 0]x + [0] >= [0 0 0]x + [0] = +(s(s(0())),f(x)) [0 0 0] [1] [0 0 0] [1] [1 1 1] [1 1 1] [0] [1 1 1] [1 0 1] f(+(x,y)) = [0 1 0]x + [0 0 0]y + [0] >= [0 1 0]x + [0 0 0]y = *(f(x),f(y)) [0 0 0] [0 0 0] [1] [0 0 0] [0 0 0] problem: f(s(0())) -> *(s(s(0())),f(0())) f(+(x,s(0()))) -> +(s(s(0())),f(x)) f(+(x,y)) -> *(f(x),f(y)) Matrix Interpretation Processor: dim=3 interpretation: [1 1 1] [1 0 1] [+](x0, x1) = [0 0 0]x0 + [0 1 0]x1 [1 0 1] [0 1 0] , [1 0 1] [1 0 0] [*](x0, x1) = [0 0 0]x0 + [0 1 0]x1 [0 0 1] [0 0 0] , [1 0 0] [s](x0) = [0 0 1]x0 [0 0 0] , [1 1 0] [f](x0) = [1 0 0]x0 [0 0 1] , [0] [0] = [0] [1] orientation: [1] [0] f(s(0())) = [0] >= [0] = *(s(s(0())),f(0())) [0] [0] [1 1 1] [1] [1 1 1] f(+(x,s(0()))) = [1 1 1]x + [0] >= [1 0 0]x = +(s(s(0())),f(x)) [1 0 1] [1] [1 0 0] [1 1 1] [1 1 1] [1 1 1] [1 1 0] f(+(x,y)) = [1 1 1]x + [1 0 1]y >= [0 0 0]x + [1 0 0]y = *(f(x),f(y)) [1 0 1] [0 1 0] [0 0 1] [0 0 0] problem: f(+(x,y)) -> *(f(x),f(y)) Matrix Interpretation Processor: dim=1 interpretation: [+](x0, x1) = x0 + x1 + 2, [*](x0, x1) = x0 + x1, [f](x0) = x0 + 1 orientation: f(+(x,y)) = x + y + 3 >= x + y + 2 = *(f(x),f(y)) problem: Qed