Definition 37.2.4 (Commutant).label Let $H$ be a complex Hilbert space and $A \subset B(H)$, then
\[A' = \bracs{T \in B(H)| TS = ST \forall S \in A}\]
is the commutant of $A$.
Definition 37.2.4 (Commutant).label Let $H$ be a complex Hilbert space and $A \subset B(H)$, then
is the commutant of $A$.
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