CrystGroup( matgroup )
CrystGroup( generating matrices )
CrystGroup( list of generators, identity )
CrystGroup( integers )
CrystGroup( string )
CrystGroup accepts as arguments either a group of affine matrices, or a
list of generating affine matrices, or an argument identifying a space
group from the crystallographic groups library, i.e., a list of two or
five integers, or a string containing a Hermann-Mauguin symbol, and
converts it into a CrystGroup in the sense of this package. CrystGroup
tests whether the generators are indeed affine matrices.
GAP 3.4.4