Alexander horned sphere

topological embedding of a 2-dimensional sphere in 3-space whose interior is a 3-ball but whose exterior is not simply connected
Thing injection Q1361755
Alexander horned sphere
No machine-readable author provided. BernardH~commonswiki assumed (based on copyright claims). · Public Domain · Wikimedia
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Alexander horned sphere

Summary

Alexander horned sphere is an injection[1]. It draws 195 Wikipedia views per month (injection category, ranking #1 of 1).[2]

Key Facts

  • Alexander horned sphere is credited with the discovery of James Waddell Alexander II[3].
  • Alexander horned sphere's video is recorded as Construcción de esfera de Alexander con cuernos.gif[4].
  • Alexander horned sphere's image is recorded as Alexander horned sphere.png[5].
  • Alexander horned sphere's instance of is recorded as injection[6].
  • Alexander horned sphere's instance of is recorded as embedding[7].
  • Alexander horned sphere's instance of is recorded as mathematical concept[8].
  • James Waddell Alexander II is named after Alexander horned sphere[9].
  • Alexander horned sphere's Commons category is recorded as Horned sphere[10].
  • Alexander horned sphere's time of discovery or invention is recorded as +1921-00-00T00:00:00Z[11].
  • Alexander horned sphere's Freebase ID is recorded as /m/032wdw[12].
  • Alexander horned sphere's Encyclopædia Britannica Online ID is recorded as topic/Alexanders-horned-sphere[13].
  • Alexander horned sphere's MathWorld ID is recorded as AlexandersHornedSphere[14].
  • Alexander horned sphere's schematic is recorded as Alexander horned sphere construction (Alexander 1924).jpg[15].
  • Alexander horned sphere's maintained by WikiProject is recorded as WikiProject Mathematics[16].
  • Alexander horned sphere's Microsoft Academic ID is recorded as 9211678[17].

Body

Works and Contributions

Alexander horned sphere is credited with the discovery of James Waddell Alexander II[3].

Why It Matters

Alexander horned sphere draws 195 Wikipedia views per month (injection category, ranking #1 of 1).[2] It has Wikipedia articles in 11 language editions, a strong signal of global cultural recognition.[18] It is known by 7 alternative names across languages and contexts.[19]

References

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

Direct Wikidata claims

  1. [4] . wikidata.org.
  2. [5] . wikidata.org.
  3. [6] . wikidata.org.
  4. [7] . wikidata.org.
  5. [8] . wikidata.org.
  6. [3] . wikidata.org.
  7. [9] . wikidata.org.
  8. [10] . wikidata.org.
  9. [11] . wikidata.org.
  10. [12] . Freebase Data Dumps. wikidata.org.
  11. [13] . wikidata.org.
  12. [14] . wikidata.org.
  13. [15] . wikidata.org.
  14. [16] . wikidata.org.
  15. [17] . wikidata.org.

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). Alexander horned sphere. Retrieved May 3, 2026, from https://4ort.xyz/entity/alexander-horned-sphere
MLA “Alexander horned sphere.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/alexander-horned-sphere.
BibTeX @misc{4ortxyz_alexander-horned-sphere_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Alexander horned sphere}}, year = {2026}, url = {https://4ort.xyz/entity/alexander-horned-sphere}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Alexander horned sphere — https://4ort.xyz/entity/alexander-horned-sphere (retrieved 2026-05-03)

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