On operators with closed range and semi-Fredholm operators over W*-algebras
Operator Algebras
2020-02-18 v2 Functional Analysis
Abstract
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 not an arbitrary C*-algebra), we obtain several results such as generalization of Schechter-Lebow characterization of semi-Fredholm operators and generalization of "punctured neighbourhood" theorem, as well as some other results that generalize their classical counterparts. We consider both adjointable and non adjointable semi-Fredholm operators over W*-algebras. Moreover, we also work with general bounded, adjointable operators with closed range over C*-algebras and prove a generalization to Hilbert C*-modules of the result in [1] on Hilbert spaces.
Keywords
Cite
@article{arxiv.1906.10609,
title = {On operators with closed range and semi-Fredholm operators over W*-algebras},
author = {Stefan Ivkovic},
journal= {arXiv preprint arXiv:1906.10609},
year = {2020}
}