Loterre: Matemáticas: closure

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closure

In topology, the closure of a subset S of points in a topological space consists of all points in S together with all limit points of S. The closure of S may equivalently be defined as the union of S and its boundary, and also as the intersection of all closed sets containing S. Intuitively, the closure can be thought of as all the points that are either in S or "very near" S. A point which is in the closure of S is a point of closure of S. The notion of closure is in many ways dual to the notion of interior.
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Closure_(topology))

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