Yang Zhen-Hang, Tian Jing-Feng
1College of Science and Technology, North China Electric Power University, Baoding, P.R. China.
Department of Science and Technology, State Grid Zhejiang Electric Power Company Research Institute, Hangzhou, China.
J Inequal Appl. 2018;2018(1):56. doi: 10.1186/s13660-018-1646-6. Epub 2018 Mar 6.
In this paper, we present a very accurate approximation for the gamma function: [Formula: see text] as [Formula: see text], and we prove that the function [Formula: see text] is strictly decreasing and convex from [Formula: see text] onto [Formula: see text], where [Formula: see text].
在本文中,我们给出了伽马函数的一个非常精确的近似:当[公式:见正文]时,[公式:见正文],并且我们证明函数[公式:见正文]在[公式:见正文]上从[公式:见正文]严格递减且凸,其中[公式:见正文]。