Lemma 13.1.4 (Convex Intersection).label Let $\curl{C_\al}_{\al\in A}\suf 2^{\R^n}$ be a collection of convex sets then $A=\caps{}{\al\in A}C_{\al}$ is convex.
Proof. Obvious.$\square$
Lemma 13.1.4 (Convex Intersection).label Let $\curl{C_\al}_{\al\in A}\suf 2^{\R^n}$ be a collection of convex sets then $A=\caps{}{\al\in A}C_{\al}$ is convex.
Proof. Obvious.$\square$
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