redhat man page for tgamma

TGAMMA(3)							libc math functions							 TGAMMA(3)

NAME
       tgamma, tgammaf, tgammal - true gamma function

SYNOPSIS
       #include <math.h>

       double tgamma(double x);
       float tgammaf(float x);
       long double tgammal(long double x);

DESCRIPTION
       This  function returns the value of the Gamma function for the argument x. It had to be called "true gamma function" since there is already
       a function gamma() that returns something else.	For details, see lgamma(3).

CONFORMING TO
       C99.

SEE ALSO
       lgamma(3), gamma(3)

GNU
								    2002-08-10								 TGAMMA(3)