While studying Ehrenfest's theorem I came across this formula for time-derivatives of expectation values. What I can't understand is why is position/momentum operator time-independent? What does it mean to be a time-dependent operator? Since position/momentum of a particle may change continuously I believe they should be time dependent. I know that I'm wrong with my reasoning. Where am I confusing?(adsbygoogle = window.adsbygoogle || []).push({});

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# I What is a time-dependent operator?

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