bicommutant
noun as in strong fondness
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Example:The bicommutant of a subset of operators A in a von Neumann algebra M is the same as the relative commutant of A in M.
Definition:In the context of operator algebras, the bicommutant is also known as the relative commutant. It refers to the commutant of the commutant of a subset of operators.
From relative commutant
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