A unital star-subalgebra of the bounded operators on a Hilbert space that is closed in the weak operator topology, equivalently in the strong operator topology. The Von Neumann double commutant theorem makes these conditions equivalent to equality with the double commutant of an operator algebra. It is norm closed and hence a C-star algebra.
A von Neumann algebra is a type of algebra of bounded operators on a Hilbert space that is closed under taking adjoints and contains the identity operator. They are named after the mathematician John von Neumann, who made significant contributions to functional analysis and quantum mechanics.
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