YES Problem: h(x,c(y,z)) -> h(c(s(y),x),z) h(c(s(x),c(s(0()),y)),z) -> h(y,c(s(0()),c(x,z))) Proof: Matrix Interpretation Processor: dim=3 interpretation: [1 1 0] [1 0 0] [h](x0, x1) = [0 0 0]x0 + [0 0 0]x1 [0 0 0] [0 0 0] , [0] [0] = [0] [1], [1 0 1] [1 0 0] [c](x0, x1) = [0 1 0]x0 + [0 1 0]x1 [0 0 0] [0 0 0] , [1 0 0] [s](x0) = [0 0 1]x0 [0 0 0] orientation: [1 1 0] [1 0 1] [1 0 0] [1 1 0] [1 0 1] [1 0 0] h(x,c(y,z)) = [0 0 0]x + [0 0 0]y + [0 0 0]z >= [0 0 0]x + [0 0 0]y + [0 0 0]z = h(c(s(y),x),z) [0 0 0] [0 0 0] [0 0 0] [0 0 0] [0 0 0] [0 0 0] [1 0 1] [1 1 0] [1 0 0] [1] [1 0 1] [1 1 0] [1 0 0] h(c(s(x),c(s(0()),y)),z) = [0 0 0]x + [0 0 0]y + [0 0 0]z + [0] >= [0 0 0]x + [0 0 0]y + [0 0 0]z = h(y,c(s(0()),c(x,z))) [0 0 0] [0 0 0] [0 0 0] [0] [0 0 0] [0 0 0] [0 0 0] problem: h(x,c(y,z)) -> h(c(s(y),x),z) Matrix Interpretation Processor: dim=1 interpretation: [h](x0, x1) = 4x0 + 5x1 + 5, [c](x0, x1) = x0 + x1 + 5, [s](x0) = x0 + 1 orientation: h(x,c(y,z)) = 4x + 5y + 5z + 30 >= 4x + 4y + 5z + 29 = h(c(s(y),x),z) problem: Qed