Estimating the digamma and trigamma functions by completely monotonicity arguments

被引:8
|
作者
Mortici, Cristinel [1 ]
机构
[1] Valahia Univ Targoviste, Dept Math, Targoviste 130082, Romania
关键词
Gamma and polygamma functions; Complete monotonicity; Inequalities; MULTIPLE GAMMA; RIEMANN ZETA; INEQUALITIES; APPROXIMATIONS; BERNOULLI; PSI;
D O I
10.1016/j.amc.2010.10.023
中图分类号
O29 [应用数学];
学科分类号
070104 ;
摘要
We establish new sharp bounds for the digamma and trigamma functions, using the complete monotonicity of some class of functions. (C) 2010 Elsevier Inc. All rights reserved.
引用
收藏
页码:4081 / 4085
页数:5
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