Compact perturbations and consequent hereditarily polaroid operators
Functional Analysis
2015-11-05 v1
Abstract
A Banach space operator is polaroid, , if the isolated points of the spectrum are poles of the operator; is hereditarily polaroid, , if every restriction of to a closed invariant subspace is polaroid. Operators have SVEP on is semi Fredholm : This, in answer to a question posed by Li and Zhou (Studia Math. 221(2014), 175-192), proves the necessity of the condition . A sufficient condition for to have SVEP on is that its component is connected. We prove: If is a Hilbert space operator, then a necessary and sufficient condition for there to exist a compact operator such that is that is connected.
Cite
@article{arxiv.1511.01408,
title = {Compact perturbations and consequent hereditarily polaroid operators},
author = {B. P. Duggal},
journal= {arXiv preprint arXiv:1511.01408},
year = {2015}
}
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10 Pages