Physics — Quantum Operators
Momentum operator, commutator and expectation values.
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\hat{p} = -i\hbar\frac{\partial}{\partial x}
[\hat{x}, \hat{p}] = i\hbar
\langle A \rangle = \langle\psi|\hat{A}|\psi\rangle
\hat{H}|\psi\rangle = E|\psi\rangle