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This is a page on GAP 3, which is still available, but no longer supported. The present version is GAP 4  (See  Status of GAP 3).

GAP 3 Share Package "xgap"

XGAP: A graphical user interface for GAP

Share package since release 3.3, about October 1993.
Corresponding GAP 4 package: GAP 4 package "xgap". We strongly recommend to use the GAP 4 version since the GAP 3 version was only experimental.

Note that the package cannot be loaded from GAP 3 via the 'RequirePackage' command, but rather XGAP has to be called in the beginning instead of GAP 3.


Frank Celler and Susanne Keitemeier.


Language: C
Operating system: Unix/X-Windows X11R5 or higher
Current version: 1.3 (in the 3.4.4 distribution)


XGAP is a graphical user interface for GAP 3, it extends the GAP 3 library with functions dealing with graphic sheets and objects. Using these functions it also supplies a graphical interface for investigating the subgroup lattice of a group, giving you easy access to the low index subgroups, prime quotient and Reidemeister-Schreier algorithms and many other GAP 3 functions for groups and subgroups. At the moment the only supported window system is X-Windows X11R5, however, programs using the XGAP library functions will run on other platforms as soon as XGAP is available on these.

Contact address

Max Neunhöffer