Singleton Set

A set having exactly one element a. A singleton set is denoted by {a} and is the simplest example of a nonempty set.

See also

Empty Set, Nonempty Set, Singleton Function

This entry contributed by Margherita Barile

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Cite this as:

Barile, Margherita. "Singleton Set." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein.

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