digamma

n.

古希腊字母的F（形似F,发音与W近，今已废）；

Algorithm AS 103: Psi (Digamma) Function
On some properties of digamma and polygamma functions
Sharp inequalities for digamma and polygamma functions
Sharp inequalities for the digamma and polygamma functions
Sharp inequalities for the digamma and polygamma functions
Generalized hypergeometric, digamma and trigamma distributions
Differential and integral f-means and applications to digamma function
New approximations of the gamma function in terms of the digamma function
Complete monotonicities of functions involving the gamma and digamma functions
Convexity, Schur-Convexity and Bounds for the Gamma Function Involving the Digamma Function