Subnormality and 2-hyponormality for Toeplitz operators.
type: Item
instance of: scholarly article
title: Subnormality and 2-hyponormality for Toeplitz operators.
zbMATH Open document ID: 1042.47016
DOI: 10.1007/BF01217530
author: Sang Hoon Lee
author: Woo Young Lee
author: Raúl E. Curto
published in: Integral Equations and Operator Theory
publication date: 2002-01-01T00:00:00Z
review text: The following problem is studied: is every 2-hyponormal Toeplitz operator subnormal? The answer is negative and there is a gap. The author gives an example of a Toeplitz operator which is 2-hyponormal but not subnormal. The problem about minimal conditions for when a 2-hyponormal Toeplitz operator is subnormal or normal are also discussed.
reviewed by: N. Karapetiants
Mathematics Subject Classification ID: 47B20
Mathematics Subject Classification ID: 47B35
zbMATH DE Number: 1890574
zbMATH Keywords: subnormality
zbMATH Keywords: 2-hyponormality
zbMATH Keywords: Toeplitz operator
MaRDI profile type: Publication
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full work available at URL: https://doi.org/10.1007/bf01217530
OpenAlex ID: W2015176734
description: scientific article; zbMATH DE number 1890574