Definition 11.3.2 (Extreme Subset).label Let $E$ be a vector space over $\real$, $K \subset E$ be convex, and $A \subset K$, then $A$ is extreme set if for any $x \in A$ and $y, z \in K$ such that $x \in (y, z)$, $y, z \in A$ as well.
Definition 11.3.2 (Extreme Subset).label Let $E$ be a vector space over $\real$, $K \subset E$ be convex, and $A \subset K$, then $A$ is extreme set if for any $x \in A$ and $y, z \in K$ such that $x \in (y, z)$, $y, z \in A$ as well.
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