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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 "grim"

GRIM: Groups of Rational and Integer Matrices

Share package since release 3.4, about April 1997, communicated by Ákos Seress.
This package has not been transferred to or replaced in GAP 4, but some of its functionality, e. g. determining whether an integral matrix group is finite, is available (by a different algorithm) as a method for 'IsFinite' in GAP 4.


Robert Beals.


Language: GAP 3
Operating system: Any
Current version: 1.0 (in the 3.4.4 distribution)


GRIM (Version~1.0) is a system for testing finiteness and integrality of rational matrix groups.


A GRIM manual is given in chapter 64 of the GAP 3 manual.

Contact address

Robert Beals