Journal of Inequalities and Applications | |
Sharp inequalities related to the volume of the unit ball in Rn\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$\mathbb{R}^{n}$\end{document} | |
Research | |
Xue-Feng Han1  Chao-Ping Chen1  | |
[1] School of Mathematics and Informatics, Henan Polytechnic University, 454003, Jiaozuo City, Henan Province, China; | |
关键词: n; Gamma function; Inequalities; Logarithmically completely monotonic function; 33B15; 26D15; | |
DOI : 10.1186/s13660-023-02933-1 | |
received in 2022-12-11, accepted in 2023-02-03, 发布年份 2023 | |
来源: Springer | |
【 摘 要 】
Let Ωn=πn/2/Γ(n2+1)\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$\Omega _{n}=\pi ^{n/2}/\Gamma (\frac{n}{2}+1)$\end{document} (n∈N\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$n \in \mathbb{N}$\end{document}) denote the volume of the unit ball in Rn\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$\mathbb{R}^{n}$\end{document}. In this paper, the logarithmically complete monotonicity of a function involving the ratio of two gamma functions is presented, which yields a sharp double inequality for the quantity Ωn2/(Ωn−1Ωn+1)\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$\Omega _{n}^{2}/(\Omega _{n-1}\Omega _{n+1})$\end{document}. Also, we establish new sharp inequalities for the quantity Ωn2/(Ωn−1Ωn+1)\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$\Omega _{n}^{2}/(\Omega _{n-1}\Omega _{n+1})$\end{document}.
【 授权许可】
CC BY
© The Author(s) 2023
【 预 览 】
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