Eigenstates and eigenvalues of the operator $xp+ px$
39080
What is the spectrum of $\hat x \hat p + \hat p \hat x$?
15035
An operator on the other side of the Schrödinger equation
78075
Why can I apply $HS^\dagger$ and then measure in the computational basis to measure $Y$?
55377
Non-zero eigenvalues of $AA^T$ and $A^TA$
93550
How to find the matrix representation of an operator from its action on a basis?
46265
Minimal polynomial of the operator $T:V\oplus W\to V\oplus W$
5506
Perturbation property of Orthonormal basis for Hilbert space
28584
Eigenvalues and eigenspaces of AB
106024
The eigenvalues and corresponding eigenvectors for the matrix
121197
Eigenvalues and eigenfunctions of the exponential potential $ V(x)=\exp(|x|) $
154772
The Momentum Operator in QM
10587
Bound states of the $V(x)=\pm \delta'^{(n)}(x)$ potential?
144019
A strictly positive operator is invertible
128361
The kernel and range of the powers of a self-adjoint operator
84535
The spectral radius of normal operator
93062
Is Every Invariant Subspace the Kernel of an polynomial applied in the operator?
122213
Proving that if $\langle Ax,x\rangle =0$ for every $x$, then $A$ is the zero operator