2 papers
math.FA2026
Near-Riesz and pseudo-Riesz bases of Hilbert C*-modules and semi-C*-Fredholm operators
Michael Frank, Stefan Ivkovic
Several useful concepts of almost frames or Riesz bases of Hilbert spaces gave us the motivation to review the theory of C*-module frames and C*-module Riesz bases for Hilbert C*-m…
math.OA2024
Spectral Fredholm Theory and Transitivity in Banach bimodules
Stefan Ivkovic
In this paper, we extend Fredholm theory in von Neumann algebras established by Breuer to spectral Fredholm theory. We consider 2 by 2 upper triangular operator matrices with coeff…