A HAP extension for crystallographic groups

Version 0.1.15
Released 2022-07-26

This project is maintained by Marc Roeder, The GAP Team

GAP Package HAPcryst

This is an extension to the HAP package by Graham Ellis. It implements geometric methods for the calculation of resolutions of Bieberbach groups.

The current version of this package is version 0.1.15, released on 2022-07-26. For more information, please refer to the package manual. There is also a README file.


This package requires GAP version >=4.9

The following other GAP packages are needed:

The following additional GAP packages are not required, but suggested:


Marc Roeder.


Please, cite this package as

[RT22] Roeder, M. and GAP Team, T., HAPcryst, A HAP extension for crystallographic groups, Version 0.1.15 (2022)
(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.