Available special functions

Gamma and related functions

gamma	The Gamma function
lgamma	Logarithm of the absolute value of the Gamma function.
loggamma	Principal branch of the logarithm of the Gamma function.
digamma	Digamma function.

Trigonometric functions

sinpi	Compute \(\sin(\pi x)\).
cospi	Compute \(\cos(\pi x)\).

Error function and related functions

erf	Error function.
erfc	Complementary error function.
erfinv	Inverse error function.
erfcinv	Inverse complementary error function.

Exponential integral and related functions

e1	Exponential integral \(E_1(x)\).
ei	Exponential integral \(Ei(x)\).
en	Generalized exponential integral \(E_n(x)\).

Riemann zeta function

zeta	Riemann zeta function.