New posts in Spectral Theory

Spectral radius of the Volterra operator

If $T$ is bounded and $F$ has finite rank, what is the spectrum of $T+F$?

Approximate eigenvalue and continuous spectrum

Spectral measure of the multiplication operator

How to characterize self-adjoint operators in terms of orthogonal diagonalizability

Can spectrum "specify" an operator?

Spectrum of the right shift operator on $\ell^2({\bf Z})$

What's the connection between the Laplace transform and the Fourier transform?