Книга: Spin group: Mathematics, Orthogonal Group, Exact Sequence, Lie Group, Simply Connected Space, Covering Space, Reflection Through the Origin, Clifford Algebra, Clifford Analysis

High Quality Content by WIKIPEDIA articles! In mathematics the spin group Spin(n) is the double cover of the special orthogonal group SO(n), such that there exists a short exact sequence of Lie groups. In low dimensions, there are isomorphisms among the classical Lie groups called accidental isomorphisms. For instance, there are isomorphisms between low dimensional spin groups and certain classical Lie groups, due to low dimensional isomorphisms between the root systems (and corresponding isomorphisms of Dynkin diagrams) of the different families of simple Lie algebras.