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Aluno
Sejam X1, X2, Y1, Y2 subconjuntos do conjunto U. Suponha que X1 ∪ X2 = U e Y1 ∩ Y2 = ∅, que X1 ⊂ Y1 e que X2 ⊂ Y2. Prove que X1 = Y1 e X2 = Y
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