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Complete monotonicity of a difference between the exponential and trigamma functions
Journal article published in 2013 by
Feng Qi 
,
Xiao-Jing Zhang
,
Xiao-Jing Zhang
Abstract
In the paper, by directly verifying an inequality which gives a lower bound for the first order modified Bessel function of the first kind, the authors supply a new proof for the complete monotonicity of a difference between the exponential function $e^{1/t}$ and the trigamma function $ψ'(t)$ on $(0,∞)$. ; Comment: 4 pages