20 citations · 113 across the 17 of their papers we have counts for
5 papers · 1 filter
On compressions and generalized spectra of operators over C*-algebras
Stefan Ivkovic
In the classical operator theory, there are several versions of spectra, related to special classes of operators (Fredholm, semi-Fredholm, upper/lower semi-Fredholm,etc.). We gener…
On generalizations of semi-Fredholm operators over C*-algebras
Stefan Ivkovic
Starting from the definition of A-Fredholm and semi-A-Fredholm operator on the standard module over a unital C*- algebra A, introduced in [8] and [4], we construct various generali…
Semi-Fredholm Theory on Hilbert C*-modules
Stefan Ivkovic
In this paper we establish the semi-Fredholm theory on Hilbert C*-modules as a continuation of Fredholm theory on Hilbert C*-modules established by Mishchenko and Fomenko. We give…
On operators with closed range and semi-Fredholm operators over W*-algebras
Stefan Ivkovic
In this paper we consider A-Fredholm and semi-A-Fredholm operators on Hilbert C*-modules over a W*-algebra A defined in [3],[10]. Using the assumption that A is a W*-algebra (and n…
On upper triangular operator matrices over C*-algebras
Stefan Ivkovic
We study adjointable, bounded operators on the direct sum of two copies of the standard Hilbert C*-module over a unital C*-algebra A that are given by upper triangular 2 by 2 opera…