节点文献
涉及方差平均的不等式及其应用
Inequalities Involving the Means of Variance and their Applications
【摘要】 定义n(n≥2)个正实数x1,x2,…,xn的r阶方差平均Dr(x,p)(x,p∈Rn++,r≥2).证明了:1.min{x}≤Dr(x,p)≤max{x};2.若正整数r>3,则有Dr(x,p)≥D3(x,p);3.若正整数r≥3,则有Dr(x,p)≥2/r1/(r-2)A(x,p),并且系数2/r1/(r-2)是最佳的.此处A(x,p)=∑nk=1pkxk∑nk=1pk为x1,x2,…,xn的带权系数p的加权算术平均.
【Abstract】 The mean Dr(x,p) of variance of order r is defined for n(n≥2) positive real numbers (x1,x2,…,xn,)where x,p∈Rn++,r≥2. The authors main results are:1. min {x}≤Dr(x,p)≤max{x}; 2. if the positive integral number r>3,then Dr(x,p)≥D3(x,p); 3. if the positive integral number r≥3,then Dr(x,p)≥(2/r)1/(r-2)A(x,p),and the constant (2/r)1/(r-2) is the best possibility, where A(x,p) is the arithmetic mean of x with weight p.
【关键词】 方差平均;
r阶方差;
数学期望;
Hermite矩阵;
【Key words】 mean of variance; variance of order r; mathematical expectation; Hermitian matrix;
【Key words】 mean of variance; variance of order r; mathematical expectation; Hermitian matrix;
- 【文献出处】 四川大学学报(自然科学版) ,Journal of Sichuan University (Natural Science Edition) , 编辑部邮箱 ,2003年06期
- 【分类号】O178
- 【被引频次】5
- 【下载频次】105