README
1Aclib -- A Library of 3- and 4-Dimensional Almost Crystallographic Groups
2=========================================================================
3
4by Karel Dekimpe and Bettina Eick
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6
7Introduction
8------------
9
10The package `aclib' contains the almost crystallographic groups as
11classified by K. Dekimpe in the Springer Lecture Notes, Vol. 1639:
12"Almost Bieberbach Groups: Affine and Polynomial Structures".
13
14The groups are available as rational matrix groups. Further, all the
15groups in the library are polycyclic. If the `Polycyclic' package for
16computations with infinite polycyclic groups is installed, then also
17polycyclic presentations for the almost crystallographic groups are
18available and can be used for computations with these groups.
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20
21
22Support
23-------
24
25Please report any problems you may encounter using `aclib' at
26 <https://github.com/gap-packages/aclib/issues>
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28
29
30License
31-------
32
33The `aclib' package is licensed under the Artistic License 2.0.
34