Is this an eigenfunction of a ladder operator?
55231
Is there a simple way of finding the eigenstates of the creation and annihilation operator in QM?
156467
Does $\langle\Omega|\mathrm{e}^{\mathrm{i}Px}=\langle\Omega|\mathrm{e}^{\mathrm{i}0x}$? $(\langle\Omega| =$ ground state of the interacting theory)
26125
Does the canonical commutation relation fix the form of the momentum operator?
92455
Orthonormalization of non-hermitian matrix eigenvectors
45071
Having the derivative be an operator
79196
Integrability of the Hilbert transform of a Schwartz function
119352
compact and self adjoint square root of an operator
14111
Determining possible minimal polynomials for a rank one linear operator
32606
Is the operator $T((x_1,x_2,...,x_n))=(x_1,\frac{x_2}2,\frac{x_3}3,...)$ on $\ell^2$ self-adjoint and unitary
29022
Linearization of PDE: $0$ is an eigenvalue since all translates of travelling waves are also travelling waves
67344
What is spectrum for Laplacian in $\mathbb{R}^n$?
49759
Proving that $i\hbar\frac{\partial}{\partial \mathbf{p}}$ is the operator of $\mathbf{x}$ in momentum space
134981
Eigenvalues of $L^\dagger L$ are positive
65100
Derivative of the product of operators and Derivative of exponential
112900
Eigenvalue of a polynomial evaluated in a operator
92744
These two operators commute...but their eigenvectors aren't all the same. Why?
59632
Bessel's function in spectral geometry