Approximation by semi-Fredholm operators with fixed nullity
type: Item
instance of: scholarly article
title: Approximation by semi-Fredholm operators with fixed nullity
zbMATH Open document ID: 0727.47006
author: Richard Bouldin
published in: Rocky Mountain Journal of Mathematics
publication date: 1990-01-01T00:00:00Z
review text: The author determines the distance from a bounded linear operator on a Hilbert space to semi-Fredholm operators with fixed nullity. As a consequence of his results he obtains the somewhat surprising fact that the closure of the union of the right semi-Fredholm operators and the left semi-Fredholm operators equals the algebra of all continuous endomorphisms.
Mathematics Subject Classification ID: 47A53
zbMATH DE Number: 4200971
zbMATH Keywords: distance from a bounded linear operator on a Hilbert space to semi- Fredholm operators with fixed nullity
zbMATH Keywords: the closure of the union of the right semi-Fredholm operators and the left semi-Fredholm operators equals the algebra of all continuous endomorphisms
reviewed by: Volker Wrobel
MaRDI profile type: Publication
full work available at URL: https://doi.org/10.1216/rmjm/1181073157
OpenAlex ID: W2028869221
cites work: Q3689716
cites work: Q3941905
cites work: Approximation by Operators with Fixed Nullity
cites work: Q3223360
cites work: The Closure of the Regular Operators in a Ring of Operators
cites work: Q4143792
cites work: Approximation by invertible and noninvertible operators
DOI: 10.1216/RMJM/1181073157
description: scientific article; zbMATH DE number 4200971