Definition 32.4.2 (Proper Ideal).label Let $A$ be a Banach algebra and $I \subset A$ be an ideal, then $I$ is proper if $I \subsetneq A$.
Definition 32.4.2 (Proper Ideal).label Let $A$ be a Banach algebra and $I \subset A$ be an ideal, then $I$ is proper if $I \subsetneq A$.
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