Abstract
In this paper, we study operator mean inequalities for the weighted arithmetic, geometric, and harmonic means. We give a slight modification of Audenaert’s result to show the relation between Kwong functions and operator monotone functions. Operator mean inequalities provide some analogs of the geometric concavity property for Kwong functions, operator convex, and operator monotone functions. Moreover, we give our points across by way of some examples which show the usage of our main results.
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References
Ando, T., Hiai, F.: Log majorization and complementary Golden–Thompson inequalities. Linear Algebra Appl. 197(198), 113–131 (1994)
Audenaert, K.M.R.: A characterisation of anti-Löwner functions. Proc. Amer. Math. Soc. 139(12), 4217–4223 (2011)
Bakherad, M.: Some generalized numerical radius inequalities involving Kwong functions. Hacet. J. Math. Stat. 48(4), 951–958 (2019)
Bhatia, R.: Matrix Analysis. Graduate Texts in Mathematics, vol. 169. Springer, New York (1997)
Bhatia, R.: Positive Definite Matrices. Princeton Series in Applied Mathematics. Princeton University Press, Princeton (2007)
Fujii, J.I., Nakamura, M., Pečarić, J., Seo, Y.: Bounds for the ratio and difference between parallel sum and series via Mond–Pečarić method. Math. Inequal. Appl. 9(4), 749–759 (2006)
Ghaemi, M.B., Gharakhanlu, N., Rassias, T.M., Saadati, R.: Advances in Matrix Inequalities. Springer Optimization and its Applications, vol. 176. Springer, Cham (2021)
Ghaemi, M.B., Kaleibary, V.: Some inequalities involving operator monotone functions and operator means. Math. Inequal. Appl. 19, 757–764 (2016)
Kubo, F., Ando, T.: Means of positive linear operators. Math. Ann. 246, 205–224 (1980)
Kwong, M.K.: Some results on matrix monotone functions. Linear Algebra Appl. 118, 129–153 (1989)
Najafi, H.: Some results on Kwong functions and related inequalities. Linear Algebra Appl. 439(9), 2634–2641 (2013)
Numazawa, Y., Sano, T.: Conditional negativity of Kwong matrices II. Linear Multilinear Algebra 70(3), 511–516 (2022)
Seo, Y.: Reverses of the Golden–Thompson type inequalities due to Ando–Hiai–Petz. Banach J. Math. Anal. 2(2), 140–149 (2008)
Tominaga, M.: Specht’s ratio in the Young inequality. Sci. Math. Jpn. 55, 583–588 (2002)
Uchiyama, M.: Operator monotone functions, positive definite kernel and majorization. Proc. Amer. Math. Soc. 138(11), 3985–3996 (2010)
Zhan, X.: Matrix Inequalities. Lecture Notes in Mathematics, vol. 1790. Springer, Berlin, Heidelberg (2002)
Zhao, J., Wu, J.: Some matrix inequalities related to Kwong functions. Linear Multilinear Algebra 67(5), 995–1005 (2019)
Acknowledgements
N. Gharakhanlu was supported by a grant from the Iran National Elites Foundation (INEF) for a postdoctoral fellowship under the supervision of M.S. Moslehian.
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Gharakhanlu, N., Moslehian, M.S. & Najafi, H. Operator mean inequalities and Kwong functions. Arch. Math. (2024). https://doi.org/10.1007/s00013-024-01980-4
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DOI: https://doi.org/10.1007/s00013-024-01980-4