Usually means: Every neighborhood contains a point.
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We found 5 dictionaries that define the word dense set:

General (1 matching dictionary)
  1. Dense set: Wikipedia, the Free Encyclopedia

Computing (2 matching dictionaries)
  1. Dense set, Dense set: Encyclopedia

Science (2 matching dictionaries)
  1. A Glossary of Mathematical Terms (No longer online)
  2. dense set: PlanetMath Encyclopedia

Definitions from Wikipedia (Dense set)

noun:  In topology and related areas of mathematics, a subset A of a topological space X is said to be dense in X if every point of X either belongs to A or else is arbitrarily "close" to a member of A — for instance, the rational numbers are a dense subset of the real numbers because every real number either is a rational number or has a rational number arbitrarily close to it (see Diophantine approximation).

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