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Harish-Chandra module

In mathematics, specifically in the representation theory of Lie groups, a Harish-Chandra module, named after the Indian-American mathematician and physicist Harish-Chandra, is a representation of a real Lie group, associated to a general representation, with regularity and finiteness conditions. When the associated representation is a -module, then its Harish-Chandra module is a representation with desirable factorization properties.

Definition
Let G be a Lie group and K a compact subgroup of G. If (\pi,V) is a representation of G, then the Harish-Chandra module of \pi is the subspace X of V consisting of the K-finite smooth vectors in V. This means that X includes exactly those vectors v such that the map \varphi_v : G \longrightarrow V via :\varphi_v(g) = \pi(g)v is smooth, and the subspace :\text{span}\{\pi(k)v : k\in K\} is finite-dimensional. ==Notes==
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