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Mixed-mean inequalities for subsets
Authors:Gangsong Leng   Lin Si   Qingsan Zhu
Affiliation:Department of Mathematics, Shanghai University, Shanghai, 200436, People's Republic of China ; Department of Mathematics, Shanghai University, Shanghai, 200436, People's Republic of China ; School of Mathematical Sciences, Peking University, Beijing 100871, People's Republic of China
Abstract:For $Asubset X={x_1,...,x_n ~vert~x_igeq 0, ~i=1,2,...,n},$ let $a_A$ and $g_A$ denote the arithmetic mean and geometric mean of elements of $A$, respectively. It is proved that if $k$ is an integer in $(frac{n}{2}, n]$, then

begin{displaymath}Big(prod_{vert Avert=katop Asubset X}a_{A}Big)^{frac{... ...{1}{C_n^k}Big(sum_{vert Avert=katop Asubset X}g_{A}Big),end{displaymath}

with equality if and only if $x_1=...=x_n$. Furthermore, as a generalization of this inequality, a mixed power-mean inequality for subsets is established.

Keywords:Mixed mean   power mean   Carlson inequality
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