Momentum operator acting on state
98417
Recovering QM from QFT
112987
Exponential of ladder operators acting on a Fock state
29952
Time-ordering vs normal-ordering and the two-point function/propagator
61484
Continuously invertible operators
128875
Expectation values of the position operator is equal to zero in case of even potentials?
81480
What is wrong with this deduction to show that within a multiplet different state has different square angular momentum?
137189
What's the deal with momentum in the infinite square well?
98535
Are eigenstates of the position operator continuous?
26249
Self adjoint operators and trace class property
94896
Deriving a QM expectation value for a square of momentum $\langle p^2 \rangle$
94173
Deriving the Lagrangian for a free particle
16692
a representation condition of Hilbert space
87328
Expectation of momentum in the bound state
61046
General construction of $W_n$-state
83832
Time as a Hermitian operator in quantum mechanics
49759
Proving that $i\hbar\frac{\partial}{\partial \mathbf{p}}$ is the operator of $\mathbf{x}$ in momentum space
94717
Systems in quantum mechanics solved by ladder operator method