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  Volume 4, Issue 2, Article 44
 
Monotonicity Results for the Gamma Function

    Authors: Chao-Ping Chen, Feng Qi,  
    Keywords: Gamma function, Monotonicity, Inequality.  
    Date Received: 01/06/02  
    Date Accepted: 01/05/03  
    Subject Codes:

33B15,26D07

  
    Editors: Andrea Laforgia,  
 
    Abstract:

The function $frac {[Gamma(x+1)]^{1/x}}{x+1}$ is strictly decreasing on $% [1,infty)$, the function $fra {[Gamma(x+1)]^{1/x}}{sqrt{x}}$ is strictly increasing on $[2,infty)$, and the function $fra {[Gamma(x+1)]^{1/x}}{% sqrt{x+1}}$ is strictly increasing on $[1,infty)$, respectively. From these, some inequalities, for example, the Minc-Sathre inequality, are deduced, and two open problems posed by the second author are solved partially.

         
       
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