Manuals/calci/GFUNCTION

GFUNCTION (Number)

• $Number$ is any positive real number.

Description

• This function shows the value of the Barnes G-function value.
• In $GFUNCTION(Number)$,$Number$ is any real number.
• $G(z)$ is a function that is an extension of super factorials to the complex numbers.
• It is related to the Gamma function, the K-function and the Glaisher–Kinkelin constant, and was named after mathematician Ernest William Barnes.
• According to elementary factors, it is a special case of the double gamma function.
• Formally, the Barnes G-function is defined in the following Weierstrass product form:

Failed to parse (syntax error): {\displaystyle G(1+z)={(2\pi)}^\frac{z}{2}exp(-\frac{z+z^2(1+\gamma)}{2})\prod_{k=1}^\infty{{(1+\frac{z}{k}}^k exp(\frac {z^2}{2k}-z)}