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+.TH GAMMA 3M
+.CT 2 math
+.SH NAME
+gamma \(mi log gamma function
+.SH SYNOPSIS
+.nf
+.B #include <math.h>
+.PP
+.B double gamma(x)
+.B double x;
+.PP
+.B extern int signgam;
+.fi
+.SH DESCRIPTION
+.I Gamma
+returns
+ln |\(*G(\|\fIx\fP\|)|.
+The sign of
+\(*G(\|\fIx\fP\|)
+is returned in the external integer
+.IR signgam .
+.SH EXAMPLES
+Computation of the gamma function:
+.PP
+.nf
+.ta 8n +8n
+.ft L
+	errno = 0;
+	y = gamma(x);
+	if(errno || (y > 88.0))
+		error();
+	y = signgam*exp(y);
+.fi
+.ft P
+.SH DIAGNOSTICS
+A large value
+.RL ( HUGE )
+is returned for negative integer arguments
+and
+.I errno
+is set to
+.BR EDOM .
+.SH BUGS
+There should be a positive indication of error.
+.br
+The name should indicate the answer is a logarithm,
+perhaps
+.IR lgamma .