Direct Integrals

Part of the Universitext book series (UTX)

Direct integrals are a generalization of direct sums. For a compact group every representation is a direct sum of irreducibles. This property fails in general for non-compact groups. The best one can get for general groups is a direct integral decomposition into factor representations. The latter is a notion more general than irreducibility. For nice groups these notions coincide, and then every unitary representation is a direct integral of irreducible representations.


Hilbert Space Irreducible Representation Conjugacy Class Compact Group Unitary Representation 
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© Springer Science+Business Media, LLC 2009

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