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SHARP BOUNDS FOR TOADER-TYPE MEANS IN TERMS OF TWO-PARAMETER MEANS

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【作者】 杨月英; 钱伟茂; 张宏伟; 褚玉明;

【Author】 Yueying YANG;Weimao QIAN;Hongwei ZHANG;Yuming CHU;School of Mechanical and Electrical Engineering, Huzhou Vocational & Technical College;School of Continuing Education, Huzhou Vocational & Technical College;School of Mathematics and Statistics, Changsha University of Science & Technology;Department of Mathematics, Huzhou University;

【通讯作者】 褚玉明;

【机构】 -School of Mechanical and Electrical Engineering, Huzhou Vocational & Technical College; School of Continuing Education, Huzhou Vocational & Technical College; School of Mathematics and Statistics, Changsha University of Science & Technology; Department of Mathematics, Huzhou University;

【摘要】 In the article, we prove that the double inequalities Gp[λ1a +(1-λ1)b, λ1 b +(1-λ1)a]A1-p(a, b) < T [A(a, b), G(a, b)]< Gp[μ1 a +(1-μ1)b, μ1b +(1-μ1)a]A1-p(a, b),Cs[λ2 a +(1-λ2)b, λ2 b +(1-λ2)a]A1-s(a, b) < T [A(a, b), Q(a, b)]< Cs[μ2 a +(1-μ2)b, μ2 b +(1-μ2)a]A1-p(a, b) hold for all a, b > 0 with a ≠ b if and only if λ1 ≤ 1/2-(1-(2/π)2/p)1/2/2, μ1 ≥ 1/2-(2p)1/2/(4 p),λ2 ≤ 1/2 + (2(3/(2 s)(E(21/2/2)/π)1/s)-1)1/2/2 and μ2 ≥ 1/2 +s1/2/(4 s) if λ1, μ1 ∈(0, 1/2),λ2, μ2 ∈(1/2, 1), p ≥ 1 and s ≥ 1/2, where G(a, b) =(ab)1/2, A(a, b) =(a + b)/2, T(a, b) =?0π/2(a2 cos2 t + b2 sin2)1/2 tdt/π, Q(a, b) =((a2+ b2)/2)1/2, C(a, b) =(a2+ b2)/(a + b) and E(r) =?0π/2 (1-r2 sin2)1/2 tdt.

【Abstract】 In the article, we prove that the double inequalities Gp[λ1a +(1-λ1)b, λ1 b +(1-λ1)a]A1-p(a, b) < T [A(a, b), G(a, b)]< Gp[μ1 a +(1-μ1)b, μ1b +(1-μ1)a]A1-p(a, b),Cs[λ2 a +(1-λ2)b, λ2 b +(1-λ2)a]A1-s(a, b) < T [A(a, b), Q(a, b)]< Cs[μ2 a +(1-μ2)b, μ2 b +(1-μ2)a]A1-p(a, b) hold for all a, b > 0 with a ≠ b if and only if λ1 ≤ 1/2-(1-(2/π)2/p)1/2/2, μ1 ≥ 1/2-(2p)1/2/(4 p),λ2 ≤ 1/2 + (2(3/(2 s)(E(21/2/2)/π)1/s)-1)1/2/2 and μ2 ≥ 1/2 +s1/2/(4 s) if λ1, μ1 ∈(0, 1/2),λ2, μ2 ∈(1/2, 1), p ≥ 1 and s ≥ 1/2, where G(a, b) =(ab)1/2, A(a, b) =(a + b)/2, T(a, b) =?0π/2(a2 cos2 t + b2 sin2)1/2 tdt/π, Q(a, b) =((a2+ b2)/2)1/2, C(a, b) =(a2+ b2)/(a + b) and E(r) =?0π/2 (1-r2 sin2)1/2 tdt.

【基金】 supported by the Natural Science Foundation of China (61673169, 11301127, 11701176, 11626101, 11601485)
  • 【文献出处】 Acta Mathematica Scientia ,数学物理学报(英文版) , 编辑部邮箱 ,2021年03期
  • 【分类号】O172.2
  • 【被引频次】1
  • 【下载频次】27
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