What is the physical reason or concept underlying the minus sign in the definition of the momentum operator in QM:
$$\hat{p}_i = -i \hbar\frac{\partial}{\partial x_i}~? $$
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Just found the reason in the following old post: https://physics.stackexchange.com/q/9557/ – Andrea Nov 15 '21 at 11:19
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voted to close since the asker has already helpfully located the duplicate question – Alwin Nov 15 '21 at 11:52