Why are members of $L^2$ the only allowed quantum states?
45559
Why we use $L_2$ Space In QM?
61046
General construction of $W_n$-state
26959
Why doesn't the uncertainty principle contradict the existence of definite-angular momentum states?
43842
Negative probabilities in quantum physics
59067
How to prove that if the expectation value of $A$ in any state is real, then $A$ is Hermitian?
70281
Why does non-commutativity in quantum mechanics require us to use Hilbert spaces?
52198
Why is every selfadjoint operator closed?
138832
Expansion coefficients of an arbitrary state in the Hilbert space of one-particle states
98535
Are eigenstates of the position operator continuous?
62030
$A^2=A^*A$. Why is matrix $A$ Hermitian?
94896
Deriving a QM expectation value for a square of momentum $\langle p^2 \rangle$
14867
How to interpret $\langle x|\hat Q|x'\rangle$ for a quantum mechanical operator $\hat Q$?
108816
$L^p$ integrable but not $L^q$ integrable
99465
Is every Lie subgroup of $SU(2)$ closed?
104034
Is $\le$ defined by $\langle 𝑥_1, 𝑦_1 \rangle \le \langle 𝑥_2, 𝑦_2 \rangle$, if $𝑥_1 \le 𝑥_2 \land𝑦_1 \ge 𝑦_2$ a linear order?
71539
The average of inverse square radius $r^{-2}$ for any state quantum $|n\ell\rangle$ using the radial Schrödinger equation
80623
Must $S$ be a unitary matrix?