High Quality Content by WIKIPEDIA articles! n mathematics, a unitary representation of a group G is a linear representation ? of G on a complex Hilbert space V such that ?(g) is a unitary operator for every g ? G. The general theory is well-developed in case G is a locally compact (Hausdorff) topological group and the representations are strongly continuous. The theory has been widely applied in quantum mechanics since the 1920s, particularly influenced by Hermann Weyl's 1928 book Gruppentheorie und Quantenmechanik. One of the pioneers in constructing a general theory of unitary representations, for any group G rather than just for particular groups useful in applications, was George Mackey.

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