Definition 41.2.2 (Self-Adjoint Part).label Let $A$ be a $C^{*}$-algebra and $S \subset A$ be an operator system, then $S_{sa}= \bracsn{x \in S|x = x^*}$ is the self-adjoint part of $S$.
Definition 41.2.2 (Self-Adjoint Part).label Let $A$ be a $C^{*}$-algebra and $S \subset A$ be an operator system, then $S_{sa}= \bracsn{x \in S|x = x^*}$ is the self-adjoint part of $S$.
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