Definition 13.6.2 (Algebraically Open).label Let $V$ be a vector space and $A\suf V$ be convex. $A$ is called algebraically open if for each $v,u\in V$, $A\cap \curl{v+\tau u:\tau\in \R}$ is an open interval (possibly empty).
Definition 13.6.2 (Algebraically Open).label Let $V$ be a vector space and $A\suf V$ be convex. $A$ is called algebraically open if for each $v,u\in V$, $A\cap \curl{v+\tau u:\tau\in \R}$ is an open interval (possibly empty).
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