Geodesic
Ki Fan inequality could be discovered much formerly
Matematičeskoe obrazovanie, no. 4 (2017), pp. 25-27 Cet article a éte moissonné depuis la source Math-Net.Ru

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The Ki Fan inequality is derived by the method presented in a book by Hardy, Littlwood, and Polya dated 1934.
Keywords: Ki Fang inequality, generalized Ki Fang inequality. 
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S. I. Kalinin. Ki Fan inequality could be discovered much formerly. Matematičeskoe obrazovanie, no. 4 (2017), pp. 25-27. http://geodesic.mathdoc.fr/item/MO_2017_4_a4/

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[2] Bekkenbakh E., Bellman R., Neravenstva, Mir, M., 1965, 276 pp. | MR

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[4] Alzer H., Ando T., Nakamura Y., “The inequalities of W. Sierpinski and Ky Fan”, J. Math. Anal. Appl., 1990, no. 149, 497–512 | DOI | MR

[5] Hardy G.H., Littlwood J.E., Polya G., Inequalities, Oxford, 1934 | MR

[6] Khardi G.G., Littlvud D.E., Polia G., Neravenstva, GIIL, M., 1948, 456 pp.