Report copyright - An´alise Real I - WordPress Institucional6 An´alise Real I Mas enta˜o x0 ∈ A e x0 ∈ B. Logo, x0 ∈ A e x0 ∈ A. Absurdo! Portanto, A ⊂ A∪ B. Definic˜ao 1.9 Chama-se
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