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[不等式] 提个 `n` 元不等式猜想

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kuing posted 2020-1-27 16:01 |Read mode
猜想:`n` 个正数 `a_i` 满足 `a_1a_2\cdots a_n=1`,设 `\lambda=\log_2n`,则有
\[\frac1{(1+a_1)^\lambda}+\frac1{(1+a_2)^\lambda}+\cdots+\frac1{(1+a_n)^\lambda}\geqslant1.\]
PS1、`n=2` 时是恒等式,`n=4` 时是经典老题;
PS2、不排除这是旧东西……

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original poster kuing posted 2021-12-24 16:19
有木有yin?

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isee posted 2021-12-24 16:35
回复 2# kuing


    木有木有

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大佬最帅 posted 2022-4-21 20:42
是这个吧
IMG_20220421_204117.jpg

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original poster kuing posted 2022-4-21 21:18
不是这个

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APPSYZY posted 2022-4-28 23:27
找到知乎上的一个证明,暂时还没看明白,先发到这里:zhihu.com/question/529450034/answer/2456952531

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original poster kuing posted 2022-4-29 01:36
回复 6# APPSYZY

多谢提供,但我也得等到有耐心的时候再仔细看
(越来越难静下心来……
(前半段半凹半凸应该没啥问题,难点就在后面的函数处理……

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