Definition 34.2.1 (Unitary).label Let $A$ be a unital $C^{*}$-algebra and $x \in A$, then $x$ is unitary if $x \in G(A)$ and $x^{*} = x^{-1}$.
Definition 34.2.1 (Unitary).label Let $A$ be a unital $C^{*}$-algebra and $x \in A$, then $x$ is unitary if $x \in G(A)$ and $x^{*} = x^{-1}$.
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