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arXiv 0902.2513math.CA
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关于Γ函数比的一个不等式的推广

An extension of an inequality for ratios of gamma functions

Feng Qi, Bai-Ni Guo

摘要:

本文证明了对于$x+y>0$和$y+1>0$,不等式{equation*} \frac{[Γ(x+y+1)/Γ(y+1)]^{1/x}}{[Γ(x+y+2)/Γ(y+1)]^{1/(x+1)}} < \biggl(\frac{x+y}{x+y+1} \biggr)^{1/2} {equation*}在$x>1$成立,在$x<1$成立,并且证明了幂$\frac12$是最佳可能的,其中$Γ(x)$是Euler伽玛函数.这推广了[Y]中的结果。Yu,\textit{An inequality for ratios of gamma functions},J. Math. Anal.申请\textbf{352}(2009),编号~ 2,967 \nobreakdash --970。]并解决了[B]中提出的一个开放问题。N. Guo和F.齐,\emph{Inequalities and monotonicity for the ratio of gamma functions},台湾数学杂志,\textbf{7}(2003),第~号。2,239 \nobreakdash --247.]。

英文摘要:

In this paper, we prove that for $x+y>0$ and $y+1>0$ the inequality {equation*} \frac{[Γ(x+y+1)/Γ(y+1)]^{1/x}}{[Γ(x+y+2)/Γ(y+1)]^{1/(x+1)}} <\biggl(\frac{x+y}{x+y+1}\biggr)^{1/2} {equation*} is valid if $x>1$ and reversed if $x<1$ and that the power $\frac12$ is the best possible, where $Γ(x)$ is the Euler gamma function. This extends the result in [Y. Yu, \textit{An inequality for ratios of gamma functions}, J. Math. Anal. Appl. \textbf{352} (2009), no.~2, 967\nobreakdash--970.] and resolves an open problem posed in [B.-N. Guo and F. Qi, \emph{Inequalities and monotonicity for the ratio of gamma functions}, Taiwanese J. Math. \textbf{7} (2003), no.~2, 239\nobreakdash--247.].

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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