HAPcryst is a library for use with the GAP computer algebra system and polymake computational geometry software. It is aimed at integral cohomology computations of Bieberbach groups.

It makes use of the polymaking packge and can be used in conjuction with GAPs crystallographic groups library and existing crystallographic group packages.


Get the current version (0.1.11) as .tar.bz2, .tar.gz, or .zip archive.


See the manual, the changelog and the README file.

The HAPcryst package is available under the terms of the GNU General Public License (GPL).

Marc Roeder (roeder.marc[at]gmail.com)
Last Update: 27th October 2013