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单参数和幂平均之间的精确不等式(英文)
Sharp Inequalities Between One-parameter and Power Means
【摘要】 对所有的a,b>0且a≠b,本文证明了不等式Jp(a,b)>M(1+2p)/3(a,b)对p∈(-2,-1/2)∪(1,+∞)成立和不等式Jp(a,b)<M(1+2p)/3(a,b)对p∈(-∞,-2)∪(-1/2,1)成立,并且参数(1+2p)/3是上述不等式成立的最佳参数,其中Jp(a,b)和Mp(a,b)分别表示两个正数a与b的p-次单参数平均和幂平均.
【Abstract】 For all a,b > 0 with a≠b,we prove that Jp(a,b) > M(1+2p/3)(a,b) for p∈(-2,-1/2) U(1,+∞) and Jp(a,b) < M(1+2p/3)(a,b) for p∈(-00,-2) ∩(-1/2,1),and the parameter((1+2p/3)) in either case is the best possible.Here,Jp(a,b) and Mp(a,b) are the one-parameter and power means of order p of two positive numbers a and b,respectively.
【基金】 Supported by NSFC(No.11071069,No.11171307);Hunan Provincial Natural Science Foundation(No.09JJ6003);the Innovation Team Foundation of the Department of Education of Zhejiang Province(No.T200924)
- 【文献出处】 数学进展 ,Advances in Mathematics , 编辑部邮箱 ,2013年05期
- 【分类号】O178
- 【下载频次】63