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Operator Bohr-type inequalities

  • Mohammad Sababheh EMAIL logo , Cristian Conde and Hamid Reza Moradi
Published/Copyright: May 24, 2024
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Abstract

The classical Bohr inequality for scalars was extended to the non-commutative case of Hilbert space operators in the literature. The sole goal of this article is to discuss the operator Bohr inequality and present some of its new variants. This includes fresh reverses and refinements of this inequality with applications towards an operator’s real and imaginary parts, not to forget the new discussion of different domains of the parameters. One further application towards the operator Dunkl-Williams inequality will be presented too. While the new results are interesting, we emphasize that the approach used to explore these inequalities differs from the existing literature methods for this context.

  1. Communicated by Emanuel Chetcuti

References

[1] Archbold, J. W.: Algebra, Pitman, London, 1958.Search in Google Scholar

[2] Beiranvand, A.—Ghazanfari, A.: Improved Young and Heinz operator inequalities for unitarily invariant norms, Math. Slovaca 70(2) (2020), 453–466.10.1515/ms-2017-0363Search in Google Scholar

[3] Bergström, H.: A triangle-inequality for matrices. In: Den 11-te Skandinaviske Matematikerkongress, Trondheim 1949, Oslo, 1952, pp. 264–267.Search in Google Scholar

[4] Bohr, H.: Zur Theorie der Fastperiodischen Funktionen I, Acta Math. 45 (1924), 29–127.10.1007/BF02395468Search in Google Scholar

[5] Chansangiam, P.—Hemchote, P.—Pantaragphong, P.: Generalizations of Bohr inequality for Hilbert space operators, J. Math. Anal. Appl. 356(2) (2009), 525–536.10.1016/j.jmaa.2009.03.006Search in Google Scholar

[6] Cheung, W.-S.—Pečarić, J.: Bohr’s inequalities for Hilbert space operators, J. Math. Anal. Appl. 323 (2006), 403–412.10.1016/j.jmaa.2005.10.046Search in Google Scholar

[7] Clarkson, J. A.: Uniformly convex spaces, Trans. Amer. Math. Soc. 40 (1936), 396–414.10.1090/S0002-9947-1936-1501880-4Search in Google Scholar

[8] Dragomir, S.: On Jensen’s additive inequality for positive convex functions of selfadjoint operators in Hilbert spaces, Jordan J. Math. Stat. 12(4) (2020), 601–623.Search in Google Scholar

[9] Dunkl, C. F.—Williams, K. S.: A simple norm inequality, Amer. Math. Monthly 71 (1964), 53–54.10.2307/2311304Search in Google Scholar

[10] Hashemi, F.—Farokhinia, A.: Improved Bellman and Aczel inequalities for operators, Rocky Mountain J. Math. 49(7) (2019), 2175–2183.10.1216/RMJ-2019-49-7-2175Search in Google Scholar

[11] Hirzallah, O.: Non-commutative operator Bohr inequality, J. Math. Anal. Appl. 282 (2003), 578–583.10.1016/S0022-247X(03)00185-9Search in Google Scholar

[12] Karamali, G.—Moradi, H. R.—Sababheh, M.: More about operator order preserving, Rocky Mountain J. Math. 51(5) (2021), 1691–1699.10.1216/rmj.2021.51.1691Search in Google Scholar

[13] Kato, T.: Notes on some inequalities for linear operators, Math. Ann. 125 (1952), 208–212.10.1007/BF01343117Search in Google Scholar

[14] Lauric, V.: The trace of the commutator of the Cesàro operator and a compact operator, Math. Slovaca 70(1) (2020), 147–150.10.1515/ms-2017-0339Search in Google Scholar

[15] Mąkowski, A.: Bol. Mat. 34 (1961), 1–11.Search in Google Scholar

[16] Marghzar, S.—Rahpeyma, O.—Bagha, D.: Some inequalities for operator (φ, h)-convex functions, Rocky mountain J. Math. 51(6) (2021), 2019–2029.10.1216/rmj.2021.51.2019Search in Google Scholar

[17] Mitrinović, D. S.: Analytic Inequalities, Springer-Verlag, NewYork, 1970.10.1007/978-3-642-99970-3Search in Google Scholar

[18] Mitrinović, D. S.—Pečarić, J. E.—Fink, A. M.: Classical and New Inequalities in Analysis, Kluwer Academic, Dordrecht, 1993.10.1007/978-94-017-1043-5Search in Google Scholar

[19] Moradi, H. R.—Heydarbeygi, Z.—Sababheh, M.: Revisiting the Grüss inequality, Oper. Matrices 15(4) (2021), 1379–1392.10.7153/oam-2021-15-86Search in Google Scholar

[20] Pečarić, J. E.—Rajić, R.: Inequalities of the Dunkl–Williams type for absolute value operators, J. Math. Inequal. 4(1) (2010), 1–10.10.7153/jmi-04-01Search in Google Scholar

[21] Sababheh, M.—Moradi, H. R.—Heydarbeygi, Z.: Buzano, Kréın and Cauchy-Schwarz inequalities, Oper. Matrices 16(1) (2022), 239–250.10.7153/oam-2022-16-19Search in Google Scholar

[22] Sababheh, M.—Furuichi, S.—Heydarbeygi, Z.—Moradi, H. R.: On the arithmetic-geometric mean inequality, J. Math. Inequal. 15(3) (2021), 1255–1266.10.7153/jmi-2021-15-84Search in Google Scholar

[23] Wang, P.—Liu, Z.: Multiple weighted norm inequalities for commutators of multilinear Calderón-Zygmund and potential type operators, Jordan J. Math. Stat. 11(3) (2018), 211–228.Search in Google Scholar

[24] Zhang, F.: On the Bohr inequality of operators, J. Math. Anal. Appl. 333 (2007), 1264–1271.10.1016/j.jmaa.2006.12.024Search in Google Scholar

Received: 2023-03-03
Accepted: 2023-06-14
Published Online: 2024-05-24
Published in Print: 2024-04-25

© 2024 Mathematical Institute Slovak Academy of Sciences

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