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Let A be a set of real numbers. We say that A is an open...

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Advance Math

Let A be a set of real numbers. We say that A is an open set iffor every x0 ? A there is some ? > 0 (which mightdepend on x0) such that (x0 ? ?,x0 + ?) ? A. Show that a set B of real numbers is closedif and only if B is the complement of some open set A

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