2 papers
math.OA2026
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…
math.FA2026
Pseudo-Riesz sequences in Hilbert C*-modules
Stefan Ivkovic
Motivated by the concept of pseudo-Riesz sequences and pseudo- Riesz bases in Hilbert spaces, recently introduced by Biswas and Mitkovski, in this paper, we study pseudo-Riesz sequ…