Difference between revisions of "Subperiodic group"
From Online Dictionary of Crystallography
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| − | <font color="blue">Groupe sous-périodique</font> (''Fr'') | + | <font color="blue">Groupe sous-périodique</font> (''Fr''); <font color="black">Gruppo subperiodico</font> (''It''); <font color="purple">亜周期群</font> (''Ja''); <font color="green">Groupo subperiódico</font> (''Sp''). |
Revision as of 09:04, 12 October 2017
Groupe sous-périodique (Fr); Gruppo subperiodico (It); 亜周期群 (Ja); Groupo subperiódico (Sp).
A subperiodic group is a group of Euclidean mappings such that its translations form a lattice in a proper subspace of the space on which it acts.
A crystallographic subperiodic group in n-dimensional space is a subperiodic group for which the group of linear parts is a crystallographic point group of n-dimensional space. The crystallographic subperiodic groups in two and three-dimensional space 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 for Crystallography, Volume E