| 单词 | symmetry |
| 释义 | symmetry The set of invariances of a system. Upon application of a symmetry operation on a system, the system is unchanged. Symmetry is studied mathematically using group theory. Some of the symmetries are directly physical. Examples include reflections and rotation for molecules and translation in crystal lattices. Symmetries can be discrete (i.e. have a finite number), such as the set of rotations for an octahedral molecule, or continuous (i.e. do not have a finite number), such as the set of rotations for atoms or nuclei. More general and abstract symmetries can occur, as in CPT invariance and in the symmetries associated with gauge theories. See also broken symmetry; supersymmetry |
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