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birthday problem

mathematical problem
Thing mathematical_problem Q339000
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birthday problem

Summary

birthday problem is a mathematical problem[1]. It ranks in the top 2% of mathematical_problem entities by monthly Wikipedia readership (12,993 views/month).[2]

Key Facts

  • birthday problem's instance of is recorded as mathematical problem[3].
  • birthday problem's Commons category is recorded as Birthday paradox[4].
  • birthday problem's main subject is probability[5].
  • birthday problem's described by source is recorded as Security Engineering: A Guide to Building Dependable Distributed Systems, 2nd edition[6].
  • birthday problem's maintained by WikiProject is recorded as WikiProject Mathematics[7].

Body

Definition and Type

birthday problem's instance of is recorded as mathematical problem[3].

Influence

Things named for birthday problem include birthday attack[8], a type of cryptographic attack[9].

Why It Matters

birthday problem ranks in the top 2% of mathematical_problem entities by monthly Wikipedia readership (12,993 views/month).[2] It has Wikipedia articles in 26 language editions, a strong signal of global cultural recognition.[10] It is known by 58 alternative names across languages and contexts.[11]

Entities named for it include birthday attack[8], a type of cryptographic attack[9].

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.

Inverse relationships (entities pointing at this one)

  1. [8] ↑ . wikidata.org. → on this site

Inline context (facts about related entities)

  1. [9] ↑ . 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. [10] ↑ . Wikidata sitelinks. wikidata.org.
  3. [11] ↑ . 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). birthday problem. Retrieved October 1, 2026, from https://4ort.xyz/entity/birthday-problem
MLA “birthday problem.” 4ort.xyz Knowledge Graph, 4ort.xyz, 1 Oct. 2026, https://4ort.xyz/entity/birthday-problem.
BibTeX @misc{4ortxyz_birthday-problem_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{birthday problem}}, year = {2026}, url = {https://4ort.xyz/entity/birthday-problem}, note = {Accessed: 2026-10-01}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): birthday problem — https://4ort.xyz/entity/birthday-problem (retrieved 2026-10-01)

Canonical URL: https://4ort.xyz/entity/birthday-problem · 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. 25d ago · VGMaintenanceBot bot · 2026-09-08 view diff on Wikidata ↗
    Instance of → mathematical problem
    Maintained by wikiproject → WikiProject Mathematics
    Instance of → —
    Main subject → probability
    + 2 other properties edited (see Wikidata diff for full list)
    "/* wbsetqualifier-add:1| */ [[Property:P9675]]: 9599, Add qualifier to Rosetta Code page ID `Birthday_problem`"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.