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Whitehead problem

the problem of whether an abelian group ๐ด satisfying Extยน(๐ด,โ„ค)=0 is necessarily free, now known to be independent of ZFC
Thing mathematical_problem Q2905020
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Whitehead problem

Summary

Whitehead problem is a mathematical problem[1]. It draws 12 Wikipedia views per month (mathematical_problem category, ranking #77 of 128).[2]

Key Facts

  • Whitehead problem's instance of is recorded as mathematical problem[3].
  • Whitehead problem's instance of is recorded as mathematical concept[4].
  • J. H. C. Whitehead is named after Whitehead problem[5].
  • Whitehead problem's Freebase ID is recorded as /m/01f4tv[6].
  • Whitehead problem's Microsoft Academic ID is recorded as 17274925[7].

Why It Matters

Whitehead problem draws 12 Wikipedia views per month (mathematical_problem category, ranking #77 of 128).[2]

References

Programmatic citations โ€” every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [3] โ†‘ . wikidata.org.
  2. [4] โ†‘ . wikidata.org.
  3. [5] โ†‘ . wikidata.org.
  4. [6] โ†‘ . wikidata.org.
  5. [7] โ†‘ . wikidata.org.

Class ancestry

  1. [1] โ†‘ . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] โ†‘ . Wikimedia Foundation. dumps.wikimedia.org.

๐Ÿ“‘ 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). Whitehead problem. Retrieved May 3, 2026, from https://4ort.xyz/entity/whitehead-problem
MLA “Whitehead problem.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/whitehead-problem.
BibTeX @misc{4ortxyz_whitehead-problem_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Whitehead problem}}, year = {2026}, url = {https://4ort.xyz/entity/whitehead-problem}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Whitehead problem — https://4ort.xyz/entity/whitehead-problem (retrieved 2026-05-03)

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