Question: 7./ Let A, A, As.... be subsets of a metric space. (a) If B. Ut, A., prove that B, Ui. A, for n-1, 2,

7./ Let A, A, As.... be subsets of a metric space. (a)

7./ Let A, A, As.... be subsets of a metric space. (a) If B. Ut, A., prove that B, Ui. A, for n-1, 2, 3,..... (b) If BU, A., prove that BU.. A.. Show, by an example, that this inclusion can be proper. -

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