Definition 16.1.3 (Interval).label Let $(E, \le)$ be an ordered vector space and $x, y \in E$, then
\[[x, y] = \bracs{z \in E| x \le z \le y}\]
is the order interval with endpoints $x$ and $y$.
Definition 16.1.3 (Interval).label Let $(E, \le)$ be an ordered vector space and $x, y \in E$, then
is the order interval with endpoints $x$ and $y$.
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