singleton

Set with exactly one element

EntityQ1165112

Also known as unit set · 1-tuple · single · monuple · monad

Overview

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In mathematics, a singleton is a set with exactly one element. For example, the set is a singleton whose single element is .

24 statements · 17% with external sources · numbers in brackets are citations

Set cardinality: 1 nature of statement: defining quality
Defining formula: \{a\}
Followed by: ordered pair subject has role: 𝑛-tuple
unordered pair subject has role: unordered 𝑛-tuple
Follows: null tuple
Different from: monad
singleton pattern
Has characteristic: list of values as qualifiers quantity: 1
Said to be the same as: monad
In defining formula: \{\} symbol represents: set-builder notation

9 identifiers linking singleton across the web's reference databases

Data quality

statements

17%

externally sourced

Source last edited October 8, 2026. AIDB refreshes this page daily.

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AIDB. (2026). singleton (Q1165112). Retrieved from https://aidb.si/e/singleton-Q1165112