Why is $i$ used in the equations for quantum mechanics?
58122
QM without complex numbers
17120
Why use Fourier expansion in Quantum Field Theory?
94627
What's wrong with this derivation that $i\hbar = 0$?
78075
Why can I apply $HS^\dagger$ and then measure in the computational basis to measure $Y$?
79524
When do you use Quantum Mechanics?
137509
How do you get quantum Hamilton-Jacobi equation from Schrödinger equation?
140459
Why is $\left(e^{2\pi i}\right)^i \neq e^{-2 \pi}$?
41407
How to derive or justify the expressions of momentum operator and energy operator?
91849
Why in the relativistic quantum mechanics $ \gamma_4$ name is not used instead of $ \gamma_5$?
14867
How to interpret $\langle x|\hat Q|x'\rangle$ for a quantum mechanical operator $\hat Q$?
100870
In De Broglie's Explanation for Bohr's Quantization Condition, why do we not use 2πr = n λ/2, why do we use 2πr = n λ?
58720
How to promote algebraic expressions to operators in quantum mechanics?
117387
Can we safely assume $\Psi(x,t) = \psi(x)e^{-i\omega t}$ always in QM?
79647
Where does the term $|\psi\rangle\langle\psi|$ come from while calculating the expectation value?
136184
Why we dont have "direct" velocity operator just as $p$? ( as use $p$ space not $v$? ) in quantum mechanics?
101320
How to tell $i$ from $-i$?
94717
Systems in quantum mechanics solved by ladder operator method