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Published online by Cambridge University Press: 08 September 2015
We show that for any coprime integers λ1, . . ., λk and any finite A ⊂
$\mathbb{Z}$ , one has where C only depends on λ1, . . ., λk .
|\lambda_1 \cdot A + \cdots + \lambda_k \cdot A| \geq (|\lambda_1| + \cdots + |\lambda_k|)|A|- C,