YES Problem: f(a(),f(b(),x)) -> f(b(),f(a(),x)) f(b(),f(c(),x)) -> f(c(),f(b(),x)) f(c(),f(a(),x)) -> f(a(),f(c(),x)) Proof: Uncurry Processor: a1(b1(x)) -> b1(a1(x)) b1(c1(x)) -> c1(b1(x)) c1(a1(x)) -> a1(c1(x)) f(a(),x1) -> a1(x1) f(b(),x1) -> b1(x1) f(c(),x1) -> c1(x1) Matrix Interpretation Processor: dim=3 interpretation: [1 0 1] [1] [c1](x0) = [0 0 0]x0 + [0] [0 0 0] [0], [1 0 0] [0] [b1](x0) = [0 1 0]x0 + [1] [0 0 0] [0], [1 1 0] [a1](x0) = [0 1 0]x0 [0 0 1] , [0] [c] = [0] [1], [1 0 1] [1 1 1] [f](x0, x1) = [0 1 1]x0 + [1 1 1]x1 [0 0 0] [0 0 1] , [0] [b] = [1] [0], [0] [a] = [0] [0] orientation: [1 1 0] [1] [1 1 0] [0] a1(b1(x)) = [0 1 0]x + [1] >= [0 1 0]x + [1] = b1(a1(x)) [0 0 0] [0] [0 0 0] [0] [1 0 1] [1] [1 0 0] [1] b1(c1(x)) = [0 0 0]x + [1] >= [0 0 0]x + [0] = c1(b1(x)) [0 0 0] [0] [0 0 0] [0] [1 1 1] [1] [1 0 1] [1] c1(a1(x)) = [0 0 0]x + [0] >= [0 0 0]x + [0] = a1(c1(x)) [0 0 0] [0] [0 0 0] [0] [1 1 1] [1 1 0] f(a(),x1) = [1 1 1]x1 >= [0 1 0]x1 = a1(x1) [0 0 1] [0 0 1] [1 1 1] [0] [1 0 0] [0] f(b(),x1) = [1 1 1]x1 + [1] >= [0 1 0]x1 + [1] = b1(x1) [0 0 1] [0] [0 0 0] [0] [1 1 1] [1] [1 0 1] [1] f(c(),x1) = [1 1 1]x1 + [1] >= [0 0 0]x1 + [0] = c1(x1) [0 0 1] [0] [0 0 0] [0] problem: b1(c1(x)) -> c1(b1(x)) c1(a1(x)) -> a1(c1(x)) f(a(),x1) -> a1(x1) f(b(),x1) -> b1(x1) f(c(),x1) -> c1(x1) Matrix Interpretation Processor: dim=3 interpretation: [1 1 0] [0] [c1](x0) = [0 1 0]x0 + [0] [0 0 1] [1], [1 0 1] [b1](x0) = [0 1 0]x0 [0 0 1] , [0] [a1](x0) = x0 + [1] [0], [0] [c] = [0] [0], [1 0 0] [1 1 1] [0] [f](x0, x1) = [1 0 0]x0 + [0 1 0]x1 + [0] [0 0 0] [0 1 1] [1], [0] [b] = [0] [0], [1] [a] = [0] [0] orientation: [1 1 1] [1] [1 1 1] [0] b1(c1(x)) = [0 1 0]x + [0] >= [0 1 0]x + [0] = c1(b1(x)) [0 0 1] [1] [0 0 1] [1] [1 1 0] [1] [1 1 0] [0] c1(a1(x)) = [0 1 0]x + [1] >= [0 1 0]x + [1] = a1(c1(x)) [0 0 1] [1] [0 0 1] [1] [1 1 1] [1] [0] f(a(),x1) = [0 1 0]x1 + [1] >= x1 + [1] = a1(x1) [0 1 1] [1] [0] [1 1 1] [0] [1 0 1] f(b(),x1) = [0 1 0]x1 + [0] >= [0 1 0]x1 = b1(x1) [0 1 1] [1] [0 0 1] [1 1 1] [0] [1 1 0] [0] f(c(),x1) = [0 1 0]x1 + [0] >= [0 1 0]x1 + [0] = c1(x1) [0 1 1] [1] [0 0 1] [1] problem: f(b(),x1) -> b1(x1) f(c(),x1) -> c1(x1) Matrix Interpretation Processor: dim=3 interpretation: [1 0 0] [c1](x0) = [0 0 0]x0 [0 0 0] , [1 0 0] [b1](x0) = [0 0 0]x0 [0 0 0] , [0] [c] = [0] [0], [1 0 0] [1 0 0] [1] [f](x0, x1) = [0 0 0]x0 + [0 0 0]x1 + [0] [0 0 0] [0 0 0] [0], [0] [b] = [0] [0] orientation: [1 0 0] [1] [1 0 0] f(b(),x1) = [0 0 0]x1 + [0] >= [0 0 0]x1 = b1(x1) [0 0 0] [0] [0 0 0] [1 0 0] [1] [1 0 0] f(c(),x1) = [0 0 0]x1 + [0] >= [0 0 0]x1 = c1(x1) [0 0 0] [0] [0 0 0] problem: Qed