Lemma 14.7 (on ℝ^d): a convex f is ρ-Lipschitz iff every subgradient at every point has norm ≤ ρ

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Lemma 14.7 (on ℝ^d): a convex f is ρ-Lipschitz iff every subgradient at every point has norm ≤ ρ · Prove2Me