On the Role of the Projection Operator in the Chordal Transform Operator
DOI:
https://doi.org/10.56714/bjrs.52.1.4.Keywords:
Self- adjoint,, Projection operator, chordal transform operator, Schatten P-norm, Hilbert Space, Hilbert-Schmidt norm, Kernal of Chordal transformAbstract
This paper investigates the projection operator in chordal transform connected with bounded linear operator on a separable Hilbert space. One projection operator is introduced by expanding a normalized form of the generalized derivation induced by the given operator, leading to a new formulation of a chordal transform. In addition, the Hilbert-Schmidt norm, Schatten P-norm and structural properties of the projection operator in chordal transform are examined in the case of self-adjoined operator, with providing the comparison between the new form of chordal transform and corresponding the generalized derivation
Downloads
References
[1] N. I. Akhiezer and I. M. Glazman, Theory of Linear Operators in Hilbert Space. New York: Dover Publications, 2013. Available: ISBN 9780486318653.
[2] O. Hirzallah and F. Kittaneh, “On the chordal transform of Hilbert space operators,” Glasg. Math. J., vol. 44, no. 2, pp. 275–284, 2002. DOI:10.1017/S0017089502020086 DOI: https://doi.org/10.1017/S0017089502020086
[3] D. S. Mitrinović, "General Inequalities," in Analytic Inequalities, Eds. Springer Berlin: Heidelberg, pp.27-185, 1970. DOI: https://doi.org/10.1007/978-3-642-99970-3 DOI: https://doi.org/10.1007/978-3-642-99970-3
[4] J. Anderson, “On normal derivations,” Proc. Amer. Math. Soc., vol. 38, no. 1, pp. 135–140, 1973. DOI: https://doi.org/10.1090/S0002-9939-1973-0312313-6 DOI: https://doi.org/10.1090/S0002-9939-1973-0312313-6
[5] M. Delai, S. Bouali, and S. Cherki, “Une remarque sur l’orthogonalité de l’image au noyau d’une dérivation généralisée,” Proc. Amer. Math. Soc., vol. 126, no. 1, pp. 167–171, 1998. DOI: https://doi.org/10.1090/S0002-9939-98-03996-3 DOI: https://doi.org/10.1090/S0002-9939-98-03996-3
[6] B. P. Duggal, “Range kernel orthogonality of derivations,” Linear Algebra Appl., vol. 304, nos. 1–3, pp. 103–108, 2000. DOI: https://doi.org/10.1016/S0024-3795(99)00193-7 DOI: https://doi.org/10.1016/S0024-3795(99)00193-7
[7] D. Kečkić,"Orthogonality of the range and the kernel of some elementary operators," Proc. Amer. Math. Soc., vol. 128, no. 11, pp. 3369-3377, 2000. DOI: https://doi.org/10.1090/S0002-9939-00-05890-1 DOI: https://doi.org/10.1090/S0002-9939-00-05890-1
[8] F. Kittaneh, “Inequalities for the Schatten p-norm,” Glasg. Math. J., vol. 26, no. 2, pp. 141–143, 1985. DOI: https:// doi.org/10.1017/S0017089500005905 DOI: https://doi.org/10.1017/S0017089500005905
[9] F. Kittaneh, “Normal derivations in norm ideals,” Proc. Amer. Math. Soc., vol. 123, no. 6, pp. 1779–1785, 1995. DOI: https://doi.org/10.1090/S0002-9939-1995-1242091-2 DOI: https://doi.org/10.1090/S0002-9939-1995-1242091-2
[10] N. Altwaijry, et al., “New results on some transforms of operators in Hilbert spaces,” Bull. Braz. Math. Soc. (N.S.), vol. 55, no. 3, p. 42, 2024. DOI:10.1007/s00574-024-00416-5 DOI: https://doi.org/10.1007/s00574-024-00416-5
[11] Y. Latushkin and S. Sukhtaiev, “First-order asymptotic perturbation theory for extensions of symmetric operators,” arXiv preprint arXiv:2012.00247, 2020. DOI: https:// doi.org/10.48550/arXiv.2012.00247
[12] F. Alpay, T. Alpay, and H. Alakkad, “Transfinite iteration of operator transforms and spectral projections in Hilbert and Banach spaces,” arXiv preprint arXiv:2508.06025, 2025. DOI: https:// doi.org/10.48550/arXiv.2508.06025
[13] J. Toft, “The Zak transform on Gelfand–Shilov and modulation spaces with applications to operator theory,” Complex Anal. Oper. Theory, vol. 15, no. 1, p. 2, 2021. DOI:10.1007/s11785-020-01039-6. DOI: https://doi.org/10.1007/s11785-020-01039-6
[14] J. B. Conway, A Course in Functional Analysis. New York: Springer, 2019. Available: ISBN 978-1-4757-4383-8
[15] A. Zamani, “A geometric approach to inequalities for the Hilbert–Schmidt norm,” Filomat, vol. 37, no. 30, pp. 10435–10444, 2023. DOI: 10.2298/FIL2330435Z. DOI: https://doi.org/10.2298/FIL2330435Z
Downloads
Published
Issue
Section
License
Copyright (c) 2026 Journal of Basrah Researches (Sciences)

This work is licensed under a Creative Commons Attribution 4.0 International License.
This journal is licensed under the Creative Commons Attribution 4.0 International License (CC BY 4.0).
Under this license, users are permitted to read, download, copy, distribute, print, search, link to the full texts of articles, and create derivative works, including for commercial purposes, provided that appropriate credit is given to the original author(s) and the source.
Authors retain the copyright of their published work, while granting the Journal of Basrah Researches Sciences (JBRS) the right of first publication. Proper attribution must include the article title, author name(s), journal name, DOI, and a link to the Creative Commons license.





