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# GAP package LAGUNA
The title
"LAGUNA" stands
for "Lie AlGebras and UNits of group
Algebras
".
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.
LAGUNA does
not use external binaries
and, therefore, works without
restrictions
on the
type of the operating system. It is redistributed
with and is loaded
by default.
If it is
not loaded due
to the specific
user settings, load it using the following command:
gap> LoadPackage(
"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. We acknowledge very much Herbert Pahlings
for communicating
the package
and the referee
for careful testing LAGUNA
and useful
suggestions.
A part
of the work
on upgrading LAG
to LAGUNA was done
in 2002 during
Olexandr 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 visits.
See the file ChangeLog
for the details about changes introduced
in each
LAGUNA
release.
Victor Bovdi, Olexandr Konovalov, Richard Rossmanith
and Csaba Schneider