Singleton set

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Revision as of 08:04, 23 November 2008 by imported>Richard Pinch (Singleton moved to Singleton set: more precise title, someone may write a Bridge article one day)

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In set theory, a singleton is a set with exactly one element:

\{a\}.\,

We have

x\in \{a\}\Leftrightarrow x=a.\,

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