ρ ≡ 1 2 m ( Ψ ∗ ∂ t Ψ − Ψ ∂ t Ψ ∗ ) {\displaystyle \rho \equiv {\frac {1}{2m}}\left({{\Psi }^{*}}{{\partial }_{t}}\Psi -\Psi {{\partial }_{t}}{{\Psi }^{*}}\right)}
