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## Main Question or Discussion Point

Since it's true in quantum mechanics that expectation values obey the classical equations of motion, then if you have a whole bunch of particles, would most of them behave classically?

I thought to get classical mechanics you needed big particles, but Ehrenfest's theorem says lots of small particles would do.

I thought to get classical mechanics you needed big particles, but Ehrenfest's theorem says lots of small particles would do.