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GAP package HeLP

Hertweck-Luthar-Passi method.

Authors

Andreas Bächle, Leo Margolis

Short Description

HeLP is a package to compute constraints on partial augmentations of torsion units in integral group rings using a method developed by Luthar, Passi and Hertweck. The package can be employed to verify the Zassenhaus Conjecture and the Prime Graph Question for finite groups, once characters are known. It uses an interface to the software package 4ti2 to solve integral linear inequalities.

Version

Current version number 3.0   (Released 03/03/2016)

Status

deposited

Dependencies

GAP version: >=4.8.2
Needed other packages: io(>=4.2), 4ti2Interface(>= 2015.04.29), CTblLib(>= 1.2.2), NormalizInterface(>= 0.9.6),
External needs: zsolve

Online documentation

HeLP: [ HTML] version   [ PDF] version  

Download

[README]    help[.tar.gz  (612K)]   [.tar.bz2  (492K)]   [-win.zip  (656K)]   [.zip  (652K)]  

Contact

Andreas Bächle
Address:
Vrije Universiteit Brussel
Vakgroep Wiskunde
Pleinlaan 2
1050 Brussels
Belgium
WWW: http://homepages.vub.ac.be/~abachle/
E-mail: ABachle@vub.ac.be

Leo Margolis
Address:
Institut für Algebra und Zahlentheorie
Universität Stuttgart
Pfaffenwaldring 57
D-70569 Stuttgart
Germany
WWW: http://www.igt.uni-stuttgart.de/LstDiffgeo/Margolis/
E-mail: Leo.Margolis@mathematik.uni-stuttgart.de