Point symmetry: Difference between revisions
From Online Dictionary of Crystallography
AndreAuthier (talk | contribs) No edit summary |
AndreAuthier (talk | contribs) No edit summary |
||
| Line 3: | Line 3: | ||
== Definition == | == Definition == | ||
The point symmetry of a position is its [[site symmetry]]. The point symmetry, or point group of a lattice is the group of linear mappings (symmetry operations, isometries) that map the vector lattice '''L''' onto itself. Those geometric crystal classes to which point symmetries of lattices belong are called holohedries. | The point symmetry of a position is its [[site symmetry]]. The point symmetry, or point group of a lattice is the group of linear mappings (symmetry operations, isometries) that map the vector lattice '''L''' onto itself. Those [[geometric crystal classes]] to which point symmetries of lattices belong are called holohedries. | ||
Revision as of 07:00, 9 May 2006
Symétrie ponctuelle (Fr). Punktsymmetrie (Ge). Simetria punctual (Sp). Simmetria del sito, simmetria puntuale (It).
Definition
The point symmetry of a position is its site symmetry. The point symmetry, or point group of a lattice is the group of linear mappings (symmetry operations, isometries) that map the vector lattice L onto itself. Those geometric crystal classes to which point symmetries of lattices belong are called holohedries.