Crate puruspe

Functions

beta	Beta function
betai
erf	Error function
erfc	Complementary error function
factorial	Just factorial
gamma	Gamma function
gammp	Incomplete Gamma function P(a,x)
gammq	Incomplete Gamma function Q(a,x)
invbetai
inverf
inverfc	Inverse of complementary error function
invgammp	Iunverse Incomplete Gamma function