1. Dense setIn topology and related areas of mathematics, a subset A of a topological space X is called dense (in X) if any point x in X belongs to A or is a limit point of A. Informally, for every point in X, the point is either in A or arbitrarily "close" to a member of A - for instance, every real number is either a rational number or has one arbitrarily close to it.
Read “Dense set” on English Wikipedia
Read “稠密集合” on Japanese Wikipedia
Read “Dense set” on DBpedia
Read “Dense set” on English Wikipedia
Read “稠密集合” on Japanese Wikipedia
Read “Dense set” on DBpedia
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