Spectrum of nonnegative operator
100731
Positive operator has a positive spectrum?
84535
The spectral radius of normal operator
38850
How to show Von Neumann Trace inequality $ \text{Tr}(AB) \leq \sum_{i=1}^n \sigma_{A,i}\sigma_{B,i} $?
65379
Deriving $\neg R$ from $\{R↔(R∨(P∧¬P)), R↔¬P, ¬P→(P↔(Q→Q)), P→Q\}$
81240
Norm of an inverse operator: $\|T^{-1}\|=\|T\|^{-1}$?
98535
Are eigenstates of the position operator continuous?
1048
Discreteness of set of energy eigenvalues
35379
Spectrum of infinite product of rings
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
134981
Eigenvalues of $L^\dagger L$ are positive
149407
Weak-to-weak continuous operator which is not norm-continuous
7457
Prove that $J^+AJ$ has positive eigenvalues
59632
Bessel's function in spectral geometry
124261
Expectation of nonnegative RV
151046
Closure of the invertible operators on a Banach space
119352
compact and self adjoint square root of an operator
56083
Find the eigenvalues of a projection operator