Lemma 13.5: λ‖w‖² is 2λ-strongly convex; strongly convex + convex is strongly convex; a minimizer u of a λ-strongly convex f has f(w) − f(u) ≥ (λ/2)‖w − u‖²

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Lemma 13.5: λ‖w‖² is 2λ-strongly convex; strongly convex + convex is strongly convex; a minimizer u of a λ-strongly convex f has f(w) − f(u) ≥ (λ/2)‖w − u‖² · Prove2Me