This is an extension to the HAP package by Graham Ellis. It implements geometric methods for the calculation of resolutions of Bieberbach groups.
This package requires GAP version >=4.9
The following other GAP packages are needed:
The following additional GAP packages are not required, but suggested:
Please, cite this package as
[RT20] Roeder, M. and GAP Team, T.,
HAPcryst, A HAP extension for crystallographic groups,
(GAP package), https://gap-packages.github.io/hapcryst/.
You can get more info by typing
Cite("HAPcryst"); in the gap prompt.
For bug reports, feature requests and suggestions, please use the issue tracker.