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mLine 1:
Line 1: − A set X is a '''dense subset''' of a set Y if the [[closure]] of X is equal to Y.+ − +
belongs in topology, clarifying this
[[topology|Topologically]] speaking, a set X is a '''dense subset''' of a set Y if the [[closure]] of X is equal to Y.
[[Category:Set theory]]
[[Category:Topologyy]]