As noted below, a scaled Laplace–Runge–Lenz vector D may be defined with the same units as angular momentum by dividing A by p 0 = 2 m | H | . Since D still transforms like a vector, the Poisson brackets of D with the angular momentum vector L can then be written in a similar form { D i , L j } = ∑ ∑ s = 1 3 ε ε i j s D s .