The Crystallographic group reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Crystallographic group

A crystallographic group is a topologically discrete subgroup of the group of isometries of some geometric space (typically, not necessarily a Euclidean space) with a compact fundamental domain.

For a plane, see 2D crystallographic group.

For 3D Euclidean space, see 3D crystallographic group and crystallographic point group.

See also crystallography, space group.

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