Q.E.D.

abbreviation to indicate the completion of a mathematical proof
Thing phrase Q188722
Q.E.D.
Philippe van Lansberge · Public Domain · Wikimedia
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Q.E.D.

Summary

Q.E.D. is a phrase[1]. Q.E.D. ranks in the top 4% of phrase entities by monthly Wikipedia readership (810 views/month).[2]

Key Facts

  • Q.E.D.'s image is recorded as Philippe van Lansberge 1604 QED.png[3].
  • Q.E.D.'s image is recorded as Spinoza Ethica Pars1 Prop1.jpg[4].
  • Q.E.D.'s instance of is recorded as phrase[5].
  • Q.E.D.'s instance of is recorded as Latin phrase[6].
  • Q.E.D.'s language of work or name is recorded as Latin[7].
  • Q.E.D.'s Freebase ID is recorded as /m/069m7[8].
  • Q.E.D.'s notation is recorded as tombstone[9].
  • Q.E.D.'s main subject is recorded as end[10].
  • Q.E.D.'s spoken text audio is recorded as Nl-Quod Erat Demonstrandum-article.ogg[11].
  • Q.E.D.'s described by source is recorded as Otto's encyclopedia[12].
  • Q.E.D.'s described by source is recorded as Meyers Konversations-Lexikon, 4th edition (1885–1890)[13].
  • Q.E.D.'s native label is recorded as {'lang': 'la', 'text': 'Quod erat demonstrandum'}[14].
  • Q.E.D.'s MathWorld ID is recorded as QED[15].
  • Q.E.D.'s NE.se ID is recorded as qed[16].
  • Q.E.D.'s Great Norwegian Encyclopedia ID is recorded as q.e.d.[17].
  • Q.E.D.'s Treccani Vocabulary ID is recorded as c-v-d[18].
  • Q.E.D.'s maintained by WikiProject is recorded as WikiProject Mathematics[19].
  • Q.E.D.'s Microsoft Academic ID is recorded as 189265371[20].
  • Q.E.D.'s Microsoft Academic ID is recorded as 2776051209[21].
  • Q.E.D.'s RationalWiki ID is recorded as Quod_erat_demonstrandum[22].
  • Q.E.D.'s Lex ID is recorded as quod_erat_demonstrandum[23].
  • Q.E.D.'s Treccani's Enciclopedia della Matematica ID is recorded as cvd[24].
  • Q.E.D.'s Treccani's Dizionario delle Scienze Fisiche ID is recorded as q-e-d[25].

Body

Works and Contributions

Things named for Q.E.D. include Q.E.D.[26], a manga series[27], written by Motohiro Katou[28].

Why It Matters

Q.E.D. ranks in the top 4% of phrase entities by monthly Wikipedia readership (810 views/month).[2] Q.E.D. has Wikipedia articles in 27 language editions, a strong signal of global cultural recognition.[29] Q.E.D. is known by 68 alternative names across languages and contexts.[30]

Entities named for Q.E.D. include Q.E.D.[26], a manga series[27], written by Motohiro Katou[28].

References

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

Direct Wikidata claims

  1. [3] . wikidata.org.
  2. [4] . wikidata.org.
  3. [5] . wikidata.org.
  4. [6] . wikidata.org.
  5. [7] . wikidata.org.
  6. [8] . Freebase Data Dumps. wikidata.org.
  7. [9] . wikidata.org.
  8. [10] . wikidata.org.
  9. [11] . wikidata.org.
  10. [12] . wikidata.org.
  11. [13] . wikidata.org.
  12. [14] . wikidata.org.
  13. [15] . wikidata.org.
  14. [16] . wikidata.org.
  15. [17] . wikidata.org.
  16. [18] . wikidata.org.
  17. [19] . wikidata.org.
  18. [20] . wikidata.org.
  19. [21] . wikidata.org.
  20. [22] . rationalwiki.org. Retrieved . rationalwiki.org. Provenance: wikidata.org.
  21. [23] . wikidata.org.
  22. [24] . wikidata.org.
  23. [25] . wikidata.org.

Inverse relationships (entities pointing at this one)

  1. [26] . wikidata.org. → on this site

Inline context (facts about related entities)

  1. [27] . Wikidata. wikidata.org. → on this site
  2. [28] . Wikidata. wikidata.org. → on this site

Class ancestry

  1. [1] . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] . Wikimedia Foundation. dumps.wikimedia.org.
  2. [29] . Wikidata sitelinks. wikidata.org.
  3. [30] . 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). Q.E.D.. Retrieved May 3, 2026, from https://4ort.xyz/entity/q-e-d
MLA “Q.E.D..” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/q-e-d.
BibTeX @misc{4ortxyz_q-e-d_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Q.E.D.}}, year = {2026}, url = {https://4ort.xyz/entity/q-e-d}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Q.E.D. — https://4ort.xyz/entity/q-e-d (retrieved 2026-05-03)

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