29 citations · 75 across the 5 of their papers we have counts for
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math.CA2009★ 29 cited
Sharp inequalities for polygamma functions
Feng Qi, Bai-Ni Guo
The main aim of this paper is to prove that the double inequality \frac{(k-1)!}{\Bigl\{x+\Bigl[\frac{(k-1)!}{|ψ^{(k)}(1)|}\Bigr]^{1/k}\Bigr\}^k} +\frac{k!}{x^{k+1}}<\bigl|ψ^{(k)}(x…
math.CA2009★ 4 cited
Logarithmic convexity of Gini means
Feng Qi, Bai-Ni Guo
In the paper, the monotonicity and logarithmic convexity of Gini means and related functions are investigated.