d t A ^ ( t ) = i [ H ^ , A ^ ( t ) ] {\displaystyle {{d}_{t}}{\hat {A}}\left(t\right)=\mathrm {i} \left[{\hat {H}},{\hat {A}}\left(t\right)\right]}
![{\displaystyle {{d}_{t}}{\hat {A}}\left(t\right)=\mathrm {i} \left[{\hat {H}},{\hat {A}}\left(t\right)\right]}](https://wikimedia.org/api/rest_v1/media/math/render/svg/dfa741c01835f30370b60c3b98f74146e9821de5)