Definition 36.8.6 (Absolute Value).label Let $A$ be a unital $C^{*}$-algebra and $x \in A$, then $|x| = \sqrt{x^{*}x}$ is the absolute value of $x$.
Definition 36.8.6 (Absolute Value).label Let $A$ be a unital $C^{*}$-algebra and $x \in A$, then $|x| = \sqrt{x^{*}x}$ is the absolute value of $x$.
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