Version 2.010
October 2007
Murat Alp
e-mail: malp@dumlupinar.edu.tr
Address:
Dumlupinar Universitesi,
Fen-Edebiyat Fakultesi, Matematik Bolumu
Merkez Kampus, Kutahya, Turkey.
Chris Wensley
e-mail: c.d.wensley@bangor.ac.uk
WWW: http://www.informatics.bangor.ac.uk/~cwensley/
Address:
School of Informatics, University of Wales Bangor,
Dean Street, Bangor, Gwynedd, LL57 1UT, U.K.
The XMod package provides functions for computation with
finite crossed modules and cat1-groups, and morphisms of these structures;
finite pre-crossed modules, pre-cat1-groups, and their Peiffer quotients;
derivations of crossed modules and sections of cat1-groups;
the actor crossed square of a crossed module; and
crossed squares and their morphisms (experimental version).
© 1997-2007 by Murat Alp and Chris Wensley
We adopt the copyright regulations of GAP as detailed in the copyright notice in the GAP manual.
The first author wishes to acknowledge support from Dumlupinar University and the Turkish government.
XMod was originally implemented in 1997 using the GAP3 language. when the first author was studying for a Ph.D. [Alp97] in Bangor.
In April 2002 the first and third parts were converted to GAP4, the pre-structures were added, and version 2.001 was released. The final two parts, covering derivations, sections and actors, were included in the January 2004 release 2.002 for {\GAP}~4.4.
The current version is 2.010, released on October 8th 2007.
Bug reports, suggestions and comments are, of course, welcome. Please contact the second author at c.d.wensley@bangor.ac.uk.
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