Definition 11.1.1 (Convex).label Let $E$ be a vector space over $K \in \RC$, then $A \subset E$ is convex if for any $x, y \in A$, $\bracs{\lambda x + (1 - \lambda) y| \lambda \in [0, 1]}\subset A$.
Definition 11.1.1 (Convex).label Let $E$ be a vector space over $K \in \RC$, then $A \subset E$ is convex if for any $x, y \in A$, $\bracs{\lambda x + (1 - \lambda) y| \lambda \in [0, 1]}\subset A$.
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