9.M. Prove that a point belongs to A if and only if it is either an...

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9.M. Prove that a point belongs to A if and only if it is either an interior or a boundary point of A. 9.N. Give an example of a set A in Rº such that A°=Ø and A = RP. Can such a set A be countable? 9.M. Prove that a point belongs to A if and only if it is either an interior or a boundary point of A. 9.N. Give an example of a set A in Rº such that A°=Ø and A = RP. Can such a set A be countable?

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9M Prove that a point belongs to A if and only if it is either an interior or a boundary point of A To prove this we need to show that if a point x be... View the full answer