Crossed Modules and Cat1-Groups

Version 2.64

This project is maintained by Christopher D. Wensley

GAP Package XMod

The XMod package provides a collection of functions for computing with crossed modules and cat1-groups, their derivations and sections, morphisms of these structures, and higher-dimensional generalisations.

The current version of this package is version 2.64. For more information, please refer to the package manual. There is also a README file.


This package requires GAP version >=4.8.8

The following other GAP packages are needed:

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


Christopher D. Wensley, Murat Alp, Alper Odabas, Enver Onder Uslu.


For bug reports, feature requests and suggestions, please use the issue tracker.