关于伽马函数的一个不等式 |
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引用本文: | 袁亦群,张孝惠.关于伽马函数的一个不等式[J].湖州师专学报,2010(1):37-39. |
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作者姓名: | 袁亦群 张孝惠 |
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作者单位: | 湖州师范学院数学系,浙江湖州313000 |
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基金项目: | The Research is Partly Supported by Depart ment of Education of Zhejiang Province(Y200908671); the National Level Characteristic Specialty:Mathematics and Applied Mathematics |
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摘 要: | 最近几年伽马函数的分析不等式研究在国际上相当广泛.利用双伽马函数的导数的一个双向不等式,通过研究函数g(x)=Γ(x+1)]1/x/x~(1/2)的单调性,从而得到了一个关于伽马函数比的不等式.该不等式在某种特殊情形下改进了张、王和褚的一个不等式.
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关 键 词: | 伽马函数 单调性 不等式 |
An Inequality for the Gamma Function |
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Authors: | YUAN Yi-qun ZHANG Xiao-hui |
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Institution: | (Faculty of Science,Huzhou Teachers College,Huzhou 313000,China) |
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Abstract: | The gamma function has been investigated intensively by many authors in recent years.This paper discusses the monotonicity of the function g(x)=Γ(x+1)]1/x/x~(1/2) by using a double inequality of the derivative of the digamma function,and obtains an inequality for some ratio of the gamma functions,which improves Zhang,Wang and Chu's result in a special case. |
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Keywords: | gamma function monotonicity inequality |
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