Barbier's theorem

theorem that every curve of constant width has perimeter π times its width
Intangible theorem Q1188048
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Barbier's theorem

Summary

Barbier's theorem is a theorem[1]. It draws 10 Wikipedia views per month (theorem category, ranking #267 of 1,306).[2]

Key Facts

  • Barbier's theorem's instance of is recorded as theorem[3].
  • Joseph-Émile Barbier is named after Barbier's theorem[4].
  • Barbier's theorem's part of is recorded as list of theorems[5].
  • Barbier's theorem's Freebase ID is recorded as /m/02s2wc[6].
  • Barbier's theorem's statement describes is recorded as curve of constant width[7].
  • Barbier's theorem's MathWorld ID is recorded as BarbiersTheorem[8].
  • Barbier's theorem's maintained by WikiProject is recorded as WikiProject Mathematics[9].
  • Barbier's theorem's Microsoft Academic ID is recorded as 2780286829[10].

Why It Matters

Barbier's theorem draws 10 Wikipedia views per month (theorem category, ranking #267 of 1,306).[2] It has Wikipedia articles in 13 language editions, a strong signal of global cultural recognition.[11]

📑 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). Barbier's theorem. Retrieved May 3, 2026, from https://4ort.xyz/entity/barbier-s-theorem
MLA “Barbier's theorem.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/barbier-s-theorem.
BibTeX @misc{4ortxyz_barbier-s-theorem_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Barbier's theorem}}, year = {2026}, url = {https://4ort.xyz/entity/barbier-s-theorem}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Barbier's theorem — https://4ort.xyz/entity/barbier-s-theorem (retrieved 2026-05-03)

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