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4. Let N+ denote the set of positive natural numbers {1, 2, 3, 4, . Z with d > 0. Define }. Let x,

4. Let N+ denote the set of positive natural numbers {1, 2, 3, 4, . Z with d > 0. Define }. Let x, d - M {x qd qZ}. Prove that MN is non-empty. 4

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