> < ^ Date: Tue, 08 Apr 2003 20:03:50 +0200
< ^ From: Alexander B. Konovalov <alexk@mcs.st-and.ac.uk >
^ Subject: GAP4 package LAGUNA

Dear Forum,

we are glad to announce the GAP4 package LAGUNA. Please find below the
content of the README file. For more details, please visit LAGUNA
homepage http://ukrgap.exponenta.ru/laguna.htm

The LAGUNA Package

The title "LAGUNA" stands for "Lie AlGebras and UNits of group
Algebras". This is the new name of the GAP4 package LAG, which is thus
replaced by LAGUNA.

LAGUNA extends GAP functionality for computations in group rings.
Besides computing some general properties and attributes of group
rings and their elements, LAGUNA is able to perform two main kinds of
computations. Namely, it can verify whether a group algebra of a
finite group satisfies certain Lie properties; and it can calculate
the structure of the normalized unit group of a group algebra of a
finite p-group over the field of p elements.

System requirements and installation of LAGUNA

LAGUNA does not use external binaries and, therefore, works without
restrictions on the type of the operation system. It is designed for
GAP4.3 (bugfix 4) and no compatibility with previous releases of GAP4
is guaranteed.

To use LAGUNA online help it is necessary to install the GAP4 package
GAPDoc by Frank Luebeck and Max Neunhoeffer, which is available from
the GAP site or http://www.math.rwth-aachen.de/~Frank.Luebeck/GAPDoc/.

LAGUNA is distributed in standard formats(zoo, tar.gz, tar.bz2,
-win.zip, zip) and can be obtained from
http://ukrgap.exponenta.ru/laguna.htm. To unpack the archive
`laguna-3.0.zoo' you need the program `unzoo', which can be obtained
from the GAP homepage http://www.gap-system.org/ (see section
`Distribution'). To install LAGUNA, copy this archive into the `pkg'
subdirectory of your GAP4.3 installation. The subdirectory `laguna'
will be created in the `pkg' directory after the following command:

unzoo -x laguna-3.0.zoo

Please note that LAGUNA replaces LAG, so it is not possible to load
both packages in the same time. Since all functionalities of LAG 2.1
are provided by LAGUNA 3.0, you can safely remove `lag' subdirectory,
if it exists in the `pkg' directory. If you would LAGUNA to be loaded
automatically with GAP, you should find the line `lag' in the file
ALLPKG in the directory `pkg' and replace the line `lag' to `laguna'.

History and Acknowledgements

Some of the features of LAGUNA were already included in the GAP4
package LAG written by the third author, Richard Rossmanith. The three
other authors first would like to thank Greg Gamble for maintaining
LAG and for upgrading it from version 2.0 to version 2.1, and Richard
Rossmanith for allowing them to update and extend the LAG package. We
are also grateful to Wolfgang Kimmerle for the organisation of the
workshop "Computational Group and Group Rings Theory" (University of
Stuttgart, 28-29 November, 2002) which allowed us to meet together and
have fruitful discussions that led towards the final LAGUNA release.

We are all very grateful to the members of the GAP team: Thomas
Breuer, Willem de Graaf, Alexander Hulpke, Stefan Kohl, Steve Linton,
Frank Luebeck, Max Neunhoeffer and many other colleagues for hepful
comments and advise.

A part of the work on upgrading LAG to LAGUNA was done in 2002 during
Alexander Konovalov's visits to Debrecen, St.Andrews and Stuttgart
Universities. He would like to express his gratitude to Adalbert Bovdi
and Victor Bovdi, Colin Campbell, Edmund Robertson and Steve Linton,
Wolfgang Kimmerle, Martin Hertweck and Stefan Kohl for their warm
hospitality, and to the NATO Science Fellowship Programme, to the
London Mathematical Society and to the DAAD for the support of this

Victor Bovdi,
Alexander Konovalov,
Richard Rossmanith
Csaba Schneider

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