If x 0 and p 0 are chosen to be unity in whatever system of units are being used, then H x + H p ≥ ≥ log ⁡ ⁡ ( e h 2 ) where h is interpreted as a dimensionless number equal to the value of the Planck constant in the chosen system of units. Note that these inequalities can be extended to multimode quantum states, or wavefunctions in more than one spatial dimension.