YES Problem: *(i(x),x) -> 1() *(1(),y) -> y *(x,0()) -> 0() *(*(x,y),z) -> *(x,*(y,z)) Proof: Matrix Interpretation Processor: dim=1 interpretation: [*](x0, x1) = 2x0 + x1 + 7, [0] = 2, [i](x0) = x0 + 1, [1] = 0 orientation: *(i(x),x) = 3x + 9 >= 0 = 1() *(1(),y) = y + 7 >= y = y *(x,0()) = 2x + 9 >= 2 = 0() *(*(x,y),z) = 4x + 2y + z + 21 >= 2x + 2y + z + 14 = *(x,*(y,z)) problem: Qed