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GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

The GAP 4 package 'XMod'

Introduction

This package allows for computation with crossed modules; cat1-groups; morphisms of these structures; derivations of crossed modules and the corresponding sections of cat1-groups.

In October 2015 a new section on isoclinism of crossed modules was added.

Experimental functions for crossed squares and cat2-groups are now included.

Distribution

• The 'XMod' package is distributed with the accepted GAP packages, see: https://www.gap-system.org/Packages/xmod.html

• It may also be obtained from the GitHub repository at: https://gap-packages.github.io/xmod/

Copyright

The 'XMod' package is Copyright {\copyright} Chris Wensley et al, 1997--2017.

'XMod' is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

For details, see http://www.gnu.org/licenses/gpl.html

Installation

• Unpack xmod-<version_number>.tar.gz in the pkg subdirectory of the GAP root directory.

• From within GAP load the package with:

  gap> LoadPackage( "xmod" );

  true

• The file manual.pdf is in the `doc' subdirectory.

Contact

If you have a question relating to 'XMod', encounter any problems, or have a suggestion for extending the package in any way, please

• email: [email protected]

• or report an issue at: https://github.com/gap-packages/xmod/issues/new