New posts in Sp.Spectral Theory

Why is there no symplectic version of spectral geometry?

Harmonic oscillator discrete spectrum

Norm bounds on spectral variation and eigenvalue variation

Schrödinger eigenfunctions are bounded

Non-empty resolvent set, then operator closed?

Can a perturbation of a matrix product always be represented as product of perturbations of its factor matrices?

An orbit of symmetric polynomials

Spectral triples which are not $\theta$-summable

How are eigenvalues and eigenvectors affected by adding the all-ones matrix?

Why $M_1 \subset M_2 \not \Rightarrow N_{M_1} (\lambda) \leq N_{M_2} (\lambda)$ for eigenvalue problem? (EDIT)