M.A. Astaburuaga

Commutation relations for unitary operators II

Let

Newtonian scattering in Hilbert space

f

Floquet operators without singular continuous spectrum

be a regular non-constant symbol defined on the

Dynamical resonances and SSF singularities for a magnetic Schroedinger operator

d

The direct and inverse problem in Newtonian scattering

-dimensional torus

Scattering Frequencies for a Perturbed System of Elastic Wave Equations

{\mathbb T}^d

Commutation relations for unitary operators I

with values on the unit circle. Denote respectively by

Absence of point spectrum for unitary operators

\kappa

Spectral properties for perturbations of unitary operators

and

Non-autonomous classical scattering

L