Factorials and gamma functions

Factorials

factorial()/fac()

fac2()

Binomial coefficients

binomial()

Gamma function

gamma()

gammaprod()

loggamma()

Rising and falling factorials

rf()

ff()

Beta function

beta()

betainc()

Super- and hyperfactorials

superfac()

hyperfac()

barnesg()

Polygamma functions and harmonic numbers

psi()/digamma()/trigamma()

harmonic()