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• Empty set - Wikipedia, the free encyclopedia

  In mathematics, and more specifically set theory, the empty set is the unique set having no members. Some axiomatic set theories assure that the empty set exists by including an ...

• Empty Set -- from Wolfram MathWorld

  The set containing no elements, commonly denoted emptyset or emptyset, the former of which is used in this work. These correspond to the Mathematica and TeX characters summarized ...

• PlanetMath: empty set

  An empty set is a set $\emptyset$ that contains no elements. The Zermelo-Fraenkel Axioms of set theory imply that there exists an empty set. One constructs an empty set by starting ...