Definition 11.3.1 (Extreme Point).label Let $E$ be a vector space over $\real$, $K \subset E$, and $x \in K$, then $x$ is extremal if there exists no $y, z \in K$ such that $x \in (y, z) \subset K$.
Definition 11.3.1 (Extreme Point).label Let $E$ be a vector space over $\real$, $K \subset E$, and $x \in K$, then $x$ is extremal if there exists no $y, z \in K$ such that $x \in (y, z) \subset K$.
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