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Monthly Journal: Publishes the methodological and theoretical role of mathematics and mathematical applications underpinning scientific research.

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Open Access Research Article

Some sharp bounds for the Hilbert-Schmidt numerical radius of operators

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pp. 1481–1489Vol. 27Issue 7November 2024DOI: 10.47974/JIM-1731XML
Received:
07 Dec 2022
Published Online:
30 Nov 2024
Article type:
Research Article
Language:
EN
Article no.:
JIM-1731
Pages:
1481–1489

Abstract

Some sharp Hilbert-Schmidt numerical radius inequalities for an operator as well as for 2 × 2 operator matrices are presented. Also, refinements of certain earlier Hilbert-Schmidt numerical radius inequalities are provided.

Keywords

Subject Classifications

(2010) 47A3047A6347B1547B10

References

[1] Abdullah Abu-Omar and Fahd Kittaneh, “A generalization of the numerical radius,” Linear Algebra Appl., vol. 569, pp. 323-334 (2019).
[2] Abdullah Aldalabih and Fahd Kittaneh, “Hilbert-Schmidt numerical radius inequalities for operator matrices,” Linear Algebra Appl., vol. 581, pp. 72-84 (2019).
[3] William Audeh, “Hilbert-Schmidt numerical radius inequalities for 2 × 2 operator matrices,” Inter. J. Math. Comp. Sci., vol. 16, pp. 1161-1167 (2021).
[4] Ravi Bhatia, Matrix Analysis, Springer, New York (1997).
[5] Mouhamad Guesba, “On some numerical radius inequalities for normal operators in Hilbert spaces,” J. Interdiscip. Math., vol. 25, no. 2, pp. 463-470 (2022), doi: 10.1080/09720502.2021.1930658.
[6] Mohammad Hajmohamadi and Reza Lashkaripour, “Some inequalities involving Hilbert-Schmidt numerical radius on 2×2 operator matrices,” Filomat, pp. 4649-4657 (2020).
[7] G. H. Hardy, J. E. Littlewood, and G. Pólya, Inequalities, 2nd ed., Cambridge, UK: Cambridge Univ. Press (1988).

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