Franz Hanauska

collaborators

2 papers

math.SP2014

Estimating the number of eigenvalues of linear operators on Banach spaces

Michael Demuth, Franz Hanauska, Marcel Hansmann +1

Let $L_{0}$ be a bounded operator on a Banach space, and consider a perturbation $L = L_{0} + K$ , where $K$ is compact. This work is concerned with obtaining bounds on the number of eigenv…

math.SP2013

On the distribution of the discrete spectrum of nuclearly perturbed operators in Banach spaces

Michael Demuth, Franz Hanauska

Let Z_0 be a bounded operator in a Banach space X with purely essential spectrum and K a nuclear operator in X. Using methods of complex analysis we study the discrete spectrum of…