In mathematics, the Sherman–Takeda theorem states that if A is a C*-algebra then its double dual is a W*-algebra, and is isomorphic to the weak closure of A in the universal representation of A.
The theorem was announced by Sherman (1950) and proved by Takeda (1954). The double dual of A is called the universal enveloping W*-algebra of A.
References
Sherman, S. (1950), "The second adjoint of a C* algebra", Proceedings of the International Congress of Mathematicians 1950 (PDF), 1, Providence, R.I.: American Mathematical Society, p. 470
Takeda, Zirô (1954), "Conjugate spaces of operator algebras", Proceedings of the Japan Academy, 30 (2): 90–95, doi:10.3792/pja/1195526177, ISSN 0021-4280, MR 0063578
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