Книга: Point Group: Symmetry, Isometry, Euclidean Space, Point Groups in Two Dimensions, Point Groups in Three Dimensions, Molecule

High Quality Content by WIKIPEDIA articles! In chemistry, a point group is a group of geometric symmetries (isometries) leaving a point fixed. Point groups can exist in a Euclidean space of any dimension. The discrete point groups in two dimensions, also called rosette groups, are used to describe the symmetries of an ornament. The point groups in three dimensions are heavily used in chemistry, especially to describe the symmetries of a molecule and of molecular orbitals forming covalent bonds, and in this context they are also called molecular point groups.