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Sherman–Takeda theorem

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In mathematics, specifically in functional analysis, 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.

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