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In mathematics, specifically in topology, the interior of a subset S of a topological space X is the union of all subsets of S that are open in X. A point that is in the interior of S is an interior point of S. The interior of S is the complement of the closure of the complement of S. In this sense interior and closure are dual notions.
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displaystyle interior int operatorname open space topology set subset isbn oclc exterior closure mathbb subseteq empty general topological operator boundary
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