Let X be a set containing infinitely many elements, and let d be a metrio on...

Let X be a set containing infinitely many elements, and let d be a metrio on X. Prove that X contains an open set U such that U and its complement Uc = X\U are both infinite

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Colby Messinger answered 1 year ago

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Let X be a set containing infinitely many elements, and let d be a metrio on...

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