Singleton set: Difference between revisions
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imported>Richard Pinch (new entry, just a definition really) |
imported>Richard Pinch (expanded slightly) |
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In [[set theory]], a '''singleton''' is a [[set (mathematics)|set]] with exactly one element: | In [[set theory]], a '''singleton''' is a [[set (mathematics)|set]] with exactly one element: | ||
:<math>\{ x \} . \,</math> | :<math>\{ a \} . \,</math> | ||
We have | |||
:<math>x \in \{ a \} \Leftrightarrow x = a . \,</math> | |||
