What's the reason for the minus sign in energy operator and momentum operator?
69854
Why is there a minus sign in this wave equation derivation?
36380
Why not use the Lagrangian, instead of the Hamiltonian, in nonrelativistic QM?
60289
How does QFT interpret the Negative probability problem of the real scalar fields' Klein-Gordon equation?
91849
Why in the relativistic quantum mechanics $ \gamma_4$ name is not used instead of $ \gamma_5$?
135713
What does "$(-1/2)_k$" mean in this expression related to incomplete elliptic integrals?
81070
Why must the eigenvalue of the number operator be an integer?
94627
What's wrong with this derivation that $i\hbar = 0$?
81980
Sign of Work and potential energy in electrostatics
141376
Why the dipole interaction term in the Hamiltonian has all diagonal elements to be zero in the energy eigenbasis?
62693
Eigenspaces of angular momentum operator and its square (Casimir operator)
134718
Why is there extra minus sign in Feynman's rules for every closed fermionic loop?
53258
Why exactly does the time-reversal operator need to be anti-linear?
94896
Deriving a QM expectation value for a square of momentum $\langle p^2 \rangle$
131906
"An operator is hermitian". Implications?
154772
The Momentum Operator in QM
130497
Understanding Dirac's notation
55948
Negative energy levels in the diagram for a hydrogen atom