- * let (ad) be the usual metric space, then the set A {-1, 2} is A closed only B open only e open and closed D. neither
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- * let (ad) be the usual metric space, then the set A {-1, 2} is A closed only B open only e open and closed D. neither
- * let (ad) be the usual metric space, then the set A {-1, 2} is A closed only B open only e open and closed D. neither open or closed
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