For commutator, HQ-QH = 0 .(adsbygoogle = window.adsbygoogle || []).push({});

But for this case as shown below, complex ψQHψ - HcomplexψQψ= 0?

If the operator Q is in term of (∂/∂t) and (∂/∂x) ,then the HQ-QH may not be zero.

Is there any restriction for Q operator?

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# Ehrenfest theorem, is there any condition for the operator Q?

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