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arXiv 0905.2732math.CA
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某些涉及多Γ函数的函数的完全单调性

Complete monotonicity of some functions involving polygamma functions

Feng Qi, Senlin Guo, Bai-Ni Guo

摘要:

本文建立了$x^α\bigl\lvertψ^{(i)}(x+β)\bigr\lvert$和$α\bigl\lvertψ^{(i)}(x+β)\bigr\lvert-x\bigl\lvertψ^{(i+1)}(x+β)\bigr\lvert$在$(0,\infty)$上分别单调和完全单调的充要条件,其中$i\in\mathbb{N}$,$α>0$和$β\ge0$是标量,$ψ^{(i)}(x)$是多Γ函数.

英文摘要:

In the present paper, we establish necessary and sufficient conditions for the functions $x^α\bigl\lvertψ^{(i)}(x+β)\bigr\lvert$ and $α\bigl\lvertψ^{(i)}(x+β)\bigr\lvert-x\bigl\lvertψ^{(i+1)}(x+β)\bigr\lvert$ respectively to be monotonic and completely monotonic on $(0,\infty)$, where $i\in\mathbb{N}$, $α>0$ and $β\ge0$ are scalars, and $ψ^{(i)}(x)$ are polygamma functions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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