@comment -*-texinfo-*-
@comment this file contains the copyright notice on Singular
@ifclear VERSION
@include version.texi
@end ifclear

@cindex copyright
@cindex factory
@cindex GMP
@cindex NTL
@cindex readline
@cindex libfac
@cindex surfex
@cindex surfer
@cindex gfanlib
@cindex cdd
@cindex cddlib
@cindex libcdd
@cindex graphviz
@cindex normaliz

@center @sc{Singular} version @value{VERSION}
@center @uref{https://rptu.de/,,University of Kaiserslautern-Landau}
@center @uref{https://mathrptu.de/,,Department of Mathematics} and  @uref{https://www.singular.uni-kl.de/zca/,,Centre for Computer Algebra}
@center Authors: W. Decker, G.-M. Greuel, G. Pfister, H. Schoenemann

@center Copyright @copyright{} 1986-@value{VERSION_DATE}
@sp 2
@center @strong{NOTICE}

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation (version 2 or version 3 of the License).

Some single files have a copyright given within the file:
Singular/links/ndbm.* (BSD)

The following software modules shipped with @sc{Singular} have their own copyright:
the omalloc library, the readline library,
the GNU Multiple Precision Library (GMP),
NTL: A Library for doing Number Theory (NTL),
Flint: Fast Library for Number Theory, the Singular-Factory library, the
Singular-Factory library, the Singular-libfac library,
surfex, and,
for the Windows distributions, the Cygwin DLL and the Cygwin tools (Cygwin), and the
XEmacs editor (XEmacs).

Their copyrights and licenses can be found in the accompanying files COPYING
which are distributed along with these packages.
(Since version 3-0-3 of @sc{Singular}, all parts have GPL or LGPL
as (one of) their licences.)

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
(see @uref{http://www.gnu.org/copyleft/gpl.html,,GPL})

Please send any comments or bug reports to
@email{singular@@mathematik.uni-kl.de}.

If you want to be informed of new releases,
please register as a @sc{Singular} user by
sending an email to
              @email{singular@@mathematik.uni-kl.de}
with subject line @code{register} and body containing the following data:
     your name, email address, organisation, country and platform(s).


For information on how to cite @sc{Singular} see
@*@uref{https://www.singular.uni-kl.de/index.php/how-to-cite-singular}.

You can also support @sc{Singular} by informing us about
your result obtained by using @sc{Singular}.

@heading Availability

The latest information regarding the status of @sc{Singular} is always
available from @uref{https://www.singular.uni-kl.de}.
@ifset singularmanual
The program @sc{Singular} and the above mentioned parts are available via
anonymous ftp through the following addresses:
@table @asis
@item GMP, libreadline
@copyright{} Free Software Foundation
@* @uref{https://gmplib.org}
@item NTL
@copyright{} Victor Shoup
@* @uref{http://www.shoup.net/ntl}
@item cdd (C implementation of the Double Description Method of Motzkin et al)
@copyright{} Komei Fukuda
@* @uref{http://www-oldurls.inf.ethz.ch/personal/fukudak/cdd_home/}
@item FLINT
@copyright{} Bill Hart, Sebastian Pancratz, Fredrik Johansson
@* @uref{http://www.flintlib.org}
@item gfanlib
@copyright{} Anders Jensen
@* @uref{https://users-math.au.dk/~jensen/software/gfan/gfan.html}
@item Singular-Factory
@copyright{} Gert-Martin Greuel/R@"udiger Stobbe/Martin Lee, University of Kaiserslautern:
@* @uref{https://www.singular.uni-kl.de/ftp/pub/Math/Singular/Factory}
@item Singular-libfac
@copyright{}  Messollen, University of Saarbr@"ucken:
@* @uref{ftp://jim.mathematik.uni-kl.de/pub/Math/Singular/Libfac/}
@item @sc{Singular} binaries and sources
@uref{ftp://jim.mathematik.uni-kl.de/pub/Math/Singular/} or via a
WWW brow@-ser from
@uref{https://www.singular.uni-kl.de/ftp/pub/Math/Singular/}
@item Cygwin
@uref{https://www.cygwin.com/}
@item Xemacs
@uref{https://www.xemacs.org}
@end table
Some external programs are optional:
@table @asis
@item 4ti2 (used by sing4ti2.lib, @pxref{sing4ti2_lib})
@uref{https://4ti2.github.io}
@item gfan (used by tropical.lib, @pxref{tropical_lib})
@uref{https://users-math.au.dk/~jensen/software/gfan/gfan.html}
@item graphviz (used by resgraph.lib, @pxref{resgraph_lib})
@uref{https://www.graphviz.org/}
@item normaliz (used by normaliz.lib, @pxref{normaliz_lib})
@copyright{} Winfried Bruns and Bogdan Ichim
@* @uref{https://www.normaliz.uni-osnabrueck.de}
@item surf (used by surf.lib, @pxref{surf_lib})
@copyright{} Stephan Endrass
@* @uref{http://surf.sf.net}
@item surfer (used by surf.lib, @pxref{surf_lib})
@uref{https://imaginary.org/program/surfer}
@item surfex (used by surfex.lib, @pxref{surfex_lib})
@copyright{} Oliver Labs (2001-2008), Stephan Holzer (2004-2005)
@* @uref{https://github.com/Singular/Singular/tree/spielwiese/Singular/LIB/surfex}
@item TOPCOM (used by polymake.lib, @pxref{polymake_lib})
@copyright{} J@"org Rambau
@* @uref{http://www.rambau.wm.uni-bayreuth.de/TOPCOM/}
@end table
@end ifset

@heading Acknowledgements

The development of @sc{Singular} is directed and coordinated by
Wolfram Decker, Gert-Martin Greuel, Gerhard Pfister, and Hans Sch@"onemann.

@cindex Contributors
@cindex Authors
@cindex Decker, Wolfram
@cindex Greuel, Gert-Martin
@cindex Pfister, Gerhard
@cindex Sch@"onemann, Hans

Current devteams:
Abdus Salam School of Mathematical Sciences in Lahore,
BTU Cottbus,
Center for Advanced Security Research Darmstadt (CASED),
FU Berlin,
Isfahan University of Technology,
Mathematisches Forschunginstitut Oberwolfach,
Oklahoma State University,
RWTH Aachen,
Universidad de Buenos Aires,
Universit@'e de Versailles Saint-Quentin-en-Yvelines,
University of G@"ottingen,
University of Hannover,
University of La Laguna
and
University of Valladolid.

Current @sc{Singular} developers:
Wolfram Decker,
Gert-Martin Greuel,
Gerhard Pfister,
Hans Sch@"onemann,

Shawki Al-Rashed,
Daniel Andres,
Mohamed Barakat,
Isabel Bermejo,
Muhammad Asan Binyamin,
Ren@'e Birkner,
Rocio Blanco,
Xenia Bogomolec,
Michael Brickenstein,
Stanislav Bulygin,
Antonio Campillo,
Raza Choudery,
Alexander Dreyer,
Christian Eder,
Santiago Encinas,
Jose Ignacio Farran,
Anne Fr@"uhbis-Kr@"uger,
Rosa de Frutos,
Eva Garcia-Llorente,
Ignacio Garcia-Marco,
Christian Haase,
Amir Hashemi,
Fernando Hernando,
Bradford Hovinen,
Nazeran Idress,
Anders Jensen,
Lars Kastner,
Junaid Alan Khan,
Kai Kr@"uger,
Santiago Laplagne,
Gr@'egoire Lecerf,
Martin Lee,
Viktor Levandovskyy,
Benjamin Lorenz,
Christoph Lossen,
Thomas Markwig,
Hannah Markwig,
Irene Marquez,
Bernd Martin,
Edgar Martinez,
Martin Monerjan,
Francisco Monserrat,
Oleksandr Motsak,
Andreas Paffenholz,
Maria Jesus Pisabarro,
Diego Ruano,
Afshan Sadiq,
Kristina Schindelar,
Mathias Schulze,
Frank Seelisch,
Andreas Steenpa@ss{},
Stefan Steidel,
Grischa Studzinski,
Katharina Werner
and
Eva Zerz.

Further contributions to @sc{Singular} have been made by:
Martin Albrecht,
Olaf Bachmann,
Muhammad Ahsan Banyamin,
Thomas Bauer,
Thomas Bayer,
Markus Becker,
J. Boehm,
Gergo Gyula Borus,
Winfried Bruns,
Fernando Hernando Carrillo,
Victor Castellanos,
Nadine Cremer,
Michael Cuntz,
Kai Dehmann,
Christian Dingler,
Marcin Dumnicki,
Stephan Endra@ss{},
Vladimir Gerdt,
Philippe Gimenez,
Christian Gorzel,
Hubert Grassmann,
Jan Hackfeld,
Agnes Heydtmann,
Dietmar Hillebrand,
Tobias Hirsch,
Markus Hochstetter,
N. Idrees,
Manuel Kauers,
Simon King,
Sebastian Jambor,
Oliver Labs,
Anen Lakhal,
Martin Lamm,
Francisco Javier Lobillo,
Christoph Mang,
Michael Me@ss{}ollen,
Andrea Mindnich,
Antonio Montes,
Jorge Martin Morales,
Thomas N@"u@ss{}ler,
Wolfgang Neumann,
Markus Perling,
Wilfried Pohl,
Adrian Popescu,
Tetyana Povalyaeva,
Carlos Rabelo,
Philipp Renner,
J.-J.Salazar-Gonzalez,
Alfredo Sanchez-Navarro,
Ivor Saynisch,
Jens Schmidt,
Thomas Siebert,
Christof Soeger,
Silke Spang,
William Stein,
R@"udiger Stobbe,
Henrik Strohmayer,
Christian Stussak,
Imade Sulandra,
Akira Suzuki,
Christine Theis,
Enrique Tobis,
Alberto Vigneron-Tenorio,
Moritz Wenk,
Eric Westenberger,
Tim Wichmann,
Oliver Wienand,
Denis Yanovich
and
Oleksandr Yena.

The development of @sc{Singular} has been supported by
    the Deutsche Forschungsgemeinschaft (DFG),
    the Stiftung Rheinland-Pfalz f@"ur Innovation,
    the Volkswagen Stiftung, and
    the European Union.
From 2010 to 2016, it was part of
    the DFG Priority Project SPP 1489.
It is currently funded by
    the DFG transregional collaborative research centre (SFB-TRR) 195 Symbolic Tools in Mathematics and their Application
and
    the Europeans Unions Horizon 2020
    research and innovation programme under grant agreement 676541.

