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Louis
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What does Ehrenfest's theorem actually mean?

I am told that Ehrenfest's theorem appplioed to a physical observable represented by $\hat A$ is:

$\frac{d<\hat A>}{dt}= \frac{i}{\bar h}\langle[\hat H,\hat A]\rangle$

I don't understand how to use this equation or what it means intuitively.

Thanks in advance.

Louis
  • 43
  • 6