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-'\" t
-.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
-.\"
-.\" SPDX-License-Identifier: GPL-1.0-or-later
-.\"
-.\" Modified 2003-11-18, aeb: historical remarks
-.\"
-.TH gamma 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-gamma, gammaf, gammal \- (logarithm of the) gamma function
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <math.h>
-.P
-.BI "[[deprecated]] double gamma(double " x ");"
-.BI "[[deprecated]] float gammaf(float " x ");"
-.BI "[[deprecated]] long double gammal(long double " x ");"
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR gamma ():
-.nf
-    _XOPEN_SOURCE
-        || /* Since glibc 2.19: */ _DEFAULT_SOURCE
-        || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
-.fi
-.P
-.BR gammaf (),
-.BR gammal ():
-.nf
-    _XOPEN_SOURCE >= 600 || (_XOPEN_SOURCE && _ISOC99_SOURCE)
-        || /* Since glibc 2.19: */ _DEFAULT_SOURCE
-        || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
-.fi
-.SH DESCRIPTION
-These functions are deprecated: instead, use either the
-.BR tgamma (3)
-or the
-.BR lgamma (3)
-functions, as appropriate.
-.P
-For the definition of the Gamma function, see
-.BR tgamma (3).
-.SS *BSD version
-The libm in 4.4BSD and some versions of FreeBSD had a
-.BR gamma ()
-function that computes the Gamma function, as one would expect.
-.SS glibc version
-glibc has a
-.BR gamma ()
-function that is equivalent to
-.BR lgamma (3)
-and computes the natural logarithm of the Gamma function.
-.SH RETURN VALUE
-See
-.BR lgamma (3).
-.SH ERRORS
-See
-.BR lgamma (3).
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR gamma (),
-.BR gammaf (),
-.BR gammal ()
-T}	Thread safety	MT-Unsafe race:signgam
-.TE
-.SH STANDARDS
-None.
-.SH HISTORY
-SVID 2.
-.P
-Because of historical variations in behavior across systems,
-this function is not specified in any recent standard.
-.P
-4.2BSD had a
-.BR gamma ()
-that computed
-.RI ln(|Gamma(| x |)|),
-leaving the sign of
-.RI Gamma(| x |)
-in the external integer
-.IR signgam .
-In 4.3BSD the name was changed to
-.BR lgamma (3),
-and the man page promises
-.P
-.in +4n
-"At some time in the future the name gamma will be rehabilitated
-and used for the Gamma function"
-.in
-.P
-This did indeed happen in 4.4BSD, where
-.BR gamma ()
-computes the Gamma function (with no effect on
-.IR signgam ).
-However, this came too late, and we now have
-.BR tgamma (3),
-the "true gamma" function.
-.\" The FreeBSD man page says about gamma() that it is like lgamma()
-.\" except that is does not set signgam.
-.\" Also, that 4.4BSD has a gamma() that computes the true gamma function.
-.SH SEE ALSO
-.BR lgamma (3),
-.BR signgam (3),
-.BR tgamma (3)