Closed numerical ranges
Functional Analysis
2019-01-29 v3
Abstract
Let x=(xn)n be a bounded complex sequence and let Mx=supn∣xn∣. By using a normaloid operator related to the sequence x=(xn)n, we prove that λ∈C,∣λ∣≤Mxsupnsup∣xn+λ∣=2Mx.
Cite
@article{arxiv.1805.09939,
title = {Closed numerical ranges},
author = {Abderrahim Baghdad and Mohamed Chraibi kaadoud},
journal= {arXiv preprint arXiv:1805.09939},
year = {2019}
}
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