In quantum mechanics, when is this true(adsbygoogle = window.adsbygoogle || []).push({});

[tex]

\langle\psi|AB|\psi\rangle=\langle\psi | A|\psi\rangle\langle\psi |B|\psi\rangle

[/tex]

? In probability theory, when the two variables are independent, the mean value of the product is the product of the mean values. What about QM?

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# Product of expectation values

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