Complete Monotonicity of a Function Involving the Ratio of Gamma Functions and Applications

نویسندگان

  • FENG QI
  • CHUN-FU WEI
چکیده

In the paper, necessary and sufficient conditions are presented for a function involving a ratio of gamma functions to be logarithmically completely monotonic. This extends and generalizes the main result of Guo and Qi [Taiwanese J. Math. 7 (2003), no. 2, 239–247] and others. As applications, several inequalities involving the volume of the unit ball in R are derived, which refine, generalize and extend some known inequalities.

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تاریخ انتشار 2011