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QM: Density matrix evolution
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[QUOTE="vanhees71, post: 4486908, member: 260864"] [Typos from previous version of this posting corrected!] You must be careful with what you mean by the dot. The equation [tex]\left (\frac{\partial \hat{\rho}}{\partial t} \right )_{\text{expl}}+\frac{1}{\mathrm{i} \hbar} [\hat{\rho},\hat{H}]=0.[/tex] is valid in any picture of time evolution. It's the socalled von-Neumann equation. [/QUOTE]
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QM: Density matrix evolution
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