Proof of Theorem 2.1, p. 247 — every x_ε = (1 − ε)x* + εx ∈ X_ε satisfies f(x_ε) ≤ f(x*) + 2εB

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Proof of Theorem 2.1, p. 247 — every x_ε = (1 − ε)x* + εx ∈ X_ε satisfies f(x_ε) ≤ f(x*) + 2εB · Prove2Me