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Kuwait Journal of Science
Article . 2025 . Peer-reviewed
License: CC BY
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Kuwait Journal of Science
Article . 2025
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Numerical range of tensor product of operators in semi-Hilbert spaces

Authors: Najla Altwaijry; Christophe Chesneau; Kais Feki; Zakaria Taki;

Numerical range of tensor product of operators in semi-Hilbert spaces

Abstract

Let A and B be two positive bounded linear operators acting on the complex Hilbert spaces H and K, respectively. In this paper, we study the (A⊗B)-numerical range WA⊗B(T⊗S) of the tensor product T⊗S for two bounded linear operators T and S on H and K, respectively. In the context of this work, we demonstrate that if either T is A-hyponormal or S is B-hyponormal, then WA⊗B(T⊗S)¯=coWA(T)¯⋅WB(S)¯,where WA(T) and WB(S) denote the A-numerical range of T and the B-numerical range of S, respectively. Here, co(⋅) and the over-line denote the convex hull and the closure, respectively. Moreover, we provide some (A⊗B)-numerical radius inequalities. © 2025 The Authors

Keywords

hyponormal operators, Q1-390, Science (General), bounded linear operators, tensor product, numerical radius inequalities, numerical range, convex hull, semi-hilbert spaces

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
1
Average
Average
Average
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