Definition 4.1.2 (Convex).label Let $E$ be a vector space over $K\in \curl{\R,\com}$ then $A\suf E$ is convex if for any $x,y\in A$, $\curl{\lam x+(1-\lam)y:\lam\in [0,1]}\suf A$
Definition 4.1.2 (Convex).label Let $E$ be a vector space over $K\in \curl{\R,\com}$ then $A\suf E$ is convex if for any $x,y\in A$, $\curl{\lam x+(1-\lam)y:\lam\in [0,1]}\suf A$