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# The GAP
4 package `Guarana`
In this package we demonstrate the algorithmic usefulness
of the
so-called Mal
'cev correspondence for computations with infinite
polycyclic groups; it
is a correspondence that associates
to every
$\Q
$-powered nilpotent group
$H$ a unique rational nilpotent Lie algebra
$L_H$ and vice-versa. The Mal
'cev correspondence was discovered by
Anatoly Mal
'cev in 1951.
## Installing this package
The Guarana package
is part
of the standard distribution
of GAP
and
so normally there should be no need
to install it separately.
If by any chance it
is not part
of your GAP distribution,
then
this package
is available at
https:
//gap-packages.github.io/guarana/
in form
of a gzipped tar-archive. The standard method
is to unpack the
package into the `pkg
' directory of your GAP distribution. This will
create a `guarana
' subdirectory.
For other non-standard options please see Chapter
74.
1
in the GAP Reference Manual.
Note that the GAP-Packages Polycyclic
and Polenta are needed
for this
package. Normally they should be contained
in your distribution.
If not,
they can be obtained at
https:
//www.gap-system.org/Packages/packages.html
## Loading the Guarana package
If the Package
is not already loaded
then you have
to request it explicitly.
This can be
done by `LoadPackage(
"guarana")`.
The `LoadPackage` command
is described
in Section
72.
2.
1
in the GAP Reference Manual.
## Running the test suite
Once the package
is installed, it
is possible
to check the correct
installation by running the test suite
of the package.
gap> Read(Filename(DirectoriesPackageLibrary(
"guarana",
"tst"),
"testall.g"));
For more details on Test Files see Section
7.
9 of the GAP Reference Manual.
If the test suite runs into an error,
then please submit
a report
to our issue tracker at
<https:
//github.com/gap-packages/guarana/issues>
## Copyright & License
Copyright (C)
2007 Björn Assmann <bjoern@mcs.st-
and.ac.uk>
Distributed under the terms
of the GNU General
Public License (GPL) v2
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; either version
2
of the License,
or (at your option) any later version.
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.
http:
//www.gnu.org/licenses/gpl-2.0.html
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.,
51 Franklin Street, Fifth Floor, Boston, MA
02110-
1301,
USA.