A cover of $\mathbb{Z}_{m_1} \times \mathbb{Z}_{m_2} \setminus \{0\}$ by $q$ sets sumfree in the group lifts to a cover of $\hat A$ by $q$ sumfree sets

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A cover of $\mathbb{Z}_{m_1} \times \mathbb{Z}_{m_2} \setminus \{0\}$ by $q$ sets sumfree in the group lifts to a cover of $\hat A$ by $q$ sumfree sets · Prove2Me