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singleton

set with exactly one element
Thing general Q1165112
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Summary

singleton ranks in the top 2% of general entities by monthly Wikipedia readership (1,307 views/month).[1]

Key Facts

  • Follows: null tuple[2]
  • Followed by: ordered pair[3], unordered pair[4]
  • Subclass of: 𝑛-tuple[5], group of 1[6], unordered 𝑛-tuple[7], set[8]
  • Said to be the same as: monad[9]
  • Has characteristic: list of values as qualifiers[10]
  • Equivalent class: http://www.ease-crc.org/ont/SOMA.owl#Singleton[11], http://www.ontologydesignpatterns.org/ont/dul/FormalSemantics.owl#FirstOrderTuple[12]
  • Different from: monad[13], singleton pattern[14]
  • Set cardinality: 1[15]
  • Maintained by WikiProject: WikiProject Mathematics[16]
  • P14853: 0001055[17]

Why It Matters

singleton has Wikipedia articles in 22 language editions, a strong signal of global cultural recognition.[18] singleton is known by 51 alternative names across languages and contexts.[19]

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [2] ↑ . wikidata.org.
  2. [3] ↑ . wikidata.org.
  3. [4] ↑ . wikidata.org.
  4. [5] ↑ . wikidata.org.
  5. [6] ↑ . wikidata.org.
  6. [7] ↑ . wikidata.org.
  7. [8] ↑ . wikidata.org.
  8. [9] ↑ . wikidata.org.
  9. [10] ↑ . wikidata.org.
  10. [11] ↑ . SOMA. wikidata.org.
  11. [12] ↑ . Q141755622. wikidata.org.
  12. [13] ↑ . wikidata.org.
  13. [14] ↑ . wikidata.org.
  14. [15] ↑ . wikidata.org.
  15. [16] ↑ . wikidata.org.
  16. [17] ↑ . wikidata.org.

Aggregate / graph-position facts

  1. [1] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [18] ↑ . Wikidata sitelinks. wikidata.org.
  3. [19] ↑ . Wikidata aliases. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). singleton. Retrieved October 17, 2026, from https://4ort.xyz/entity/singleton-q1165112-2
MLA “singleton.” 4ort.xyz Knowledge Graph, 4ort.xyz, 17 Oct. 2026, https://4ort.xyz/entity/singleton-q1165112-2.
BibTeX @misc{4ortxyz_singleton-q1165112-2_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{singleton}}, year = {2026}, url = {https://4ort.xyz/entity/singleton-q1165112-2}, note = {Accessed: 2026-10-17}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): singleton — https://4ort.xyz/entity/singleton-q1165112-2 (retrieved 2026-10-17)

Canonical URL: https://4ort.xyz/entity/singleton-q1165112-2 · Last refreshed:

Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

  1. 17h ago · عُثمان · 2026-10-17 view diff on Wikidata ↗
    Equivalent class → http://www.ease-crc.org/ont/SOMA.owl#Singleton, http://www.ontologydesignpatterns.org/ont/dul/FormalSemantic
    Claims rich → —
    "/* wbsetclaim-create:2||1 */ Equivalent class: http://www.ontologydesignpatterns.org/ont/dul/FormalSemantics.owl#FirstOrderTuple"
  2. 9d ago · عُثمان · 2026-10-08 view diff on Wikidata ↗
    Equivalent class → http://www.ease-crc.org/ont/SOMA.owl#Singleton, http://www.ontologydesignpatterns.org/ont/dul/FormalSemantic
    Treccani's enciclopedia della matematica id → singoletto, singleton
    Claims rich → —
    "/* wbsetclaim-create:2||1 */ Equivalent class: http://www.ease-crc.org/ont/SOMA.owl#Singleton"
  3. 17d ago · Horcrux · 2026-09-30 view diff on Wikidata ↗
    Treccani's enciclopedia della matematica id → singoletto, singleton
    Wikipedia languages → ['ar', 'ca', 'cs', 'de', 'el', 'en', 'eo', 'es', 'eu', 'fa', 'fr', 'gl', 'he', '
    Claims rich → —
    "/* wbsetclaim-create:2||1 */ Treccani's enciclopedia della matematica id: singoletto"
  4. 5w ago · عُثمان · 2026-09-08 view diff on Wikidata ↗
    Has characteristic → list of values as qualifiers
    Subclass of → —
    Maintained by wikiproject → WikiProject Mathematics
    Said to be the same as → monad
    + 9 other properties edited (see Wikidata diff for full list)
    "/* wbsetclaim-create:2||1 */ P14853: 0001055"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.