Abstract
For x = (x 1, x 2, ⋯, x n ) ∈ ℝ n+ ∪ ℝ n− , the symmetric functions F n (x, r) and G n (x, r) are defined by
and
respectively, where r = 1, 2, ⋯, n, and i 1, i 2, ⋯, i n are positive integers. In this paper, the Schur convexity of F n (x, r) and G n (x, r) are discussed. As applications, by a bijective transformation of independent variable for a Schur convex function, the authors obtain Schur convexity for some other symmetric functions, which subsumes the main results in recent literature; and by use of the theory of majorization establish some inequalities. In particular, the authors derive from the results of this paper the Weierstrass inequalities and the Ky Fan’s inequality, and give a generalization of Safta’s conjecture in the n-dimensional space and others.
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This work was supported by the National Natural Science Foundation of China (Nos. 11271118, 10871061, 11301172), the Nature Science Foundation of Hunan Province (No. 12JJ3002), the Scientific Research Fund of Hunan Provincial Education Department (No. 11A043) and the Construct Program of the Key Discipline in Hunan Province.
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Sun, M., Chen, N., Li, S. et al. Schur convexity for two classes of symmetric functions and their applications. Chin. Ann. Math. Ser. B 35, 969–990 (2014). https://doi.org/10.1007/s11401-014-0860-x
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DOI: https://doi.org/10.1007/s11401-014-0860-x