Definition 9.7.1 (Positive).label Let $A$ be a $C^{*}$-algebra and $x\in A$, then $x$ is positive if there exists $y\in A$ such that $x=y^{*}y$.
Definition 9.7.1 (Positive).label Let $A$ be a $C^{*}$-algebra and $x\in A$, then $x$ is positive if there exists $y\in A$ such that $x=y^{*}y$.
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