Lemma 27.2 (as its one-line proof gives it): N(cr, {ca + a₀ : a ∈ A}) ≤ N(r, A) for c > 0, r > 0

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Lemma 27.2 (as its one-line proof gives it): N(cr, {ca + a₀ : a ∈ A}) ≤ N(r, A) for c > 0, r > 0 · Prove2Me