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GeezerVison is showing mathworld.wolfram.com — Singleton Set -- from Wolfram MathWorld

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Singleton Set

A singleton set is 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

Closed Point, Empty Set, Nonempty Set, Singleton Function

This entry contributed by Margherita Barile

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Cite this as:

Weisstein, Eric W., with contributions by Margherita Barile. "Singleton Set." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/SingletonSet.html

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