AClib

Almost Crystallographic Groups - A Library and Algorithms

Version 1.3.1
Released 2018-10-11

This project is maintained by Bettina Eick

Aclib -- A Library of 3- and 4-Dimensional Almost Crystallographic Groups
=========================================================================

by Karel Dekimpe and Bettina Eick

Introduction
------------

The package aclib' contains the almost crystallographic groups as
classified by K. Dekimpe in the Springer Lecture Notes, Vol. 1639:
"Almost Bieberbach Groups: Affine and Polynomial Structures".

The groups are available as rational matrix groups. Further, all the
groups in the library are polycyclic. If the Polycyclic' package for
computations with infinite polycyclic groups is installed, then also
polycyclic presentations for the almost crystallographic groups are
available and can be used for computations with these groups.

Support
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Please report any problems you may encounter using aclib' at

The aclib' package is licensed under the Artistic License 2.0.