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RedHat 9 (Linux i386) - man page for tgamma (redhat section 3)

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)