77 citations · 1.1k across the 47 of their papers we have counts for
4 papers · 1 filter
Sharp bounds for harmonic numbers
Feng Qi, Bai-Ni Guo
In the paper, we first survey some results on inequalities for bounding harmonic numbers or Euler-Mascheroni constant, and then we establish a new sharp double inequality for bound…
A completely monotonic function involving the tri- and tetra-gamma functions
Feng Qi, Bai-Ni Guo
The psi function is defined by and for denote the polygamma functions, where is the gamma function. In this pa…
Two monotonic functions involving gamma function and volume of unit ball
Feng Qi, Bai-Ni Guo
In present paper, we prove the monotonicity of two functions involving the gamma function and relating to the -dimensional volume of the unit ball in $\mat…
A refinement of a double inequality for the gamma function
Feng Qi, Bai-Ni Guo
In the paper, we present a monotonicity result of a function involving the gamma function and the logarithmic function, refine a double inequality for the gamma function, and impro…