Function rgsl::hypergeometric::hyperg_2F0

pub fn hyperg_2F0(a: f64, b: f64, x: f64) -> f64

This routine computes the hypergeometric function 2F0(a,b,x). The series representation is a divergent hypergeometric series. However, for x < 0 we have 2F0(a,b,x) = (-1/x)^a U(a,1+a-b,-1/x)