Difference between revisions of "Subperiodic group"
From Online Dictionary of Crystallography
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A '''subperiodic group''' is a group possessing translational periodicity in a subspace of the space where the group is acting. Subperiodic groups in two and three-dimensional spaces are classified in: | A '''subperiodic group''' is a group possessing translational periodicity in a subspace of the space where the group is acting. Subperiodic groups in two and three-dimensional spaces are classified in: | ||
| − | *'''frieze groups''': two-dimensional groups with one-dimensional translations; | + | *'''frieze groups''': 7 two-dimensional groups with one-dimensional translations; |
| − | *'''rod groups''': three-dimensional groups with one-dimensional translations; | + | *'''rod groups''': 75 three-dimensional groups with one-dimensional translations; |
| − | *'''layer groups''': three-dimensional groups with two-dimensional translations. | + | *'''layer groups''': 80 three-dimensional groups with two-dimensional translations. |
Revision as of 11:32, 6 January 2009
Groupe sous-périodique (Fr); Gruppo subperiodico (It).
A subperiodic group is a group possessing translational periodicity in a subspace of the space where the group is acting. Subperiodic groups in two and three-dimensional spaces are classified in:
- frieze groups: 7 two-dimensional groups with one-dimensional translations;
- rod groups: 75 three-dimensional groups with one-dimensional translations;
- layer groups: 80 three-dimensional groups with two-dimensional translations.
See also
International Tables of Crystallography, Volume E