Bayes' theorem

theorem describing the probability of an event based on prior knowledge of conditions that might be related to the event
Intangible theorem Q182505
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Summary

Bayes' theorem is a theorem[1]. It ranks in the top 0.15% of theorem entities by monthly Wikipedia readership (16,401 views/month, #2 of 1,306).[2]

Key Facts

  • Discoverer or inventor: Thomas Bayes[3]
  • Named after: Thomas Bayes[4]
  • Part of: list of theorems[5]
  • Commons category: Bayes' theorem[6]
  • Time of discovery or invention: 1763[7]
  • Main subject: conditional probability[8]
  • Used by: Bayesian statistics[9], naive Bayes classifier[10], Bayesian probability[11]
  • Studied by: probability theory[12], Bayesian statistics[13]
  • On focus list of Wikimedia project: Wikipedia:Vital articles/Level/4[14]
  • Maintained by WikiProject: WikiProject Mathematics[15]

Body

Influence

Things named for Bayes' theorem include Bayesian spam filtering[16], an algorithm[17].

Why It Matters

Bayes' theorem has Wikipedia articles in 28 language editions, a strong signal of global cultural recognition.[18] It is known by 88 alternative names across languages and contexts.[19]

It has been cited as an influence by Bayesian confidence propagation neural network[20].

Entities named for it include Bayesian spam filtering[16], an algorithm[17].

FAQs

Who did Bayes' theorem influence?

Bayes' theorem has been cited as an influence by Bayesian confidence propagation neural network[20].

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] ↑ . 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.

Inverse relationships (entities pointing at this one)

  1. [20] ↑ . wikidata.org. → on this site
  2. [16] ↑ . wikidata.org. → on this site

Inline context (facts about related entities)

  1. [17] ↑ . 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. [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). Bayes' theorem. Retrieved October 16, 2026, from https://4ort.xyz/entity/bayes-theorem
MLA “Bayes' theorem.” 4ort.xyz Knowledge Graph, 4ort.xyz, 16 Oct. 2026, https://4ort.xyz/entity/bayes-theorem.
BibTeX @misc{4ortxyz_bayes-theorem_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Bayes' theorem}}, year = {2026}, url = {https://4ort.xyz/entity/bayes-theorem}, note = {Accessed: 2026-10-16}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Bayes' theorem — https://4ort.xyz/entity/bayes-theorem (retrieved 2026-10-16)

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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. 14w ago · Nyuhn · 2026-07-10 view diff on Wikidata ↗
    P14541 → ['3Ab5DB', '2k6jCH']
    "/* wbeditentity-update:0| */ QuickStatements 3.0 [[:toollabs:qs-dev/batch/40849|batch #40849]]: ZGBK ID"
  2. 17w ago · Yirba · 2026-06-20 view diff on Wikidata ↗
    Used by → —
    Instance of → theorem
    Part of → —
    Maintained by wikiproject → WikiProject Mathematics
    + 11 other properties edited (see Wikidata diff for full list)
    "/* wbeditentity-update:0| */ QuickStatements 3.0 [[:toollabs:qs-dev/batch/37444|batch #37444]]: Encyclopedia of China (Third Edition) ID (2026) (P14541) 2"
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