Definition 11.4.1 (Barrel).label Let $E$ be a TVS over $K \in \RC$ and $D \subset E$, then $D$ is a barrel if it is convex, circled, radial, and closed.
Definition 11.4.1 (Barrel).label Let $E$ be a TVS over $K \in \RC$ and $D \subset E$, then $D$ is a barrel if it is convex, circled, radial, and closed.
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