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Ptolemy's inequality

inequality relating the six distances between four points on a plane
Intangible mathematical_concept Q743775
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Ptolemy's inequality

Summary

Ptolemy's inequality is a mathematical concept[1]. It draws 44 Wikipedia views per month (mathematical_concept category, ranking #219 of 1,007).[2]

Key Facts

  • Ptolemy's inequality's instance of is recorded as mathematical concept[3].
  • Ptolemy's inequality's instance of is recorded as inequality[4].
  • Ptolemy is named after Ptolemy's inequality[5].
  • Ptolemy's inequality's Google Knowledge Graph ID is recorded as /g/122m42lb[6].
  • Ptolemy's inequality's Google Knowledge Graph ID is recorded as /g/120rrfcs[7].
  • Ptolemy's inequality's Microsoft Academic ID is recorded as 2776268399[8].

Why It Matters

Ptolemy's inequality draws 44 Wikipedia views per month (mathematical_concept category, ranking #219 of 1,007).[2] It has Wikipedia articles in 9 language editions, a strong signal of global cultural recognition.[9]

Related Entities

Ptolemy

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.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [9] ↑ . Wikidata sitelinks. 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). Ptolemy's inequality. Retrieved May 3, 2026, from https://4ort.xyz/entity/ptolemy-s-inequality
MLA “Ptolemy's inequality.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/ptolemy-s-inequality.
BibTeX @misc{4ortxyz_ptolemy-s-inequality_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Ptolemy's inequality}}, year = {2026}, url = {https://4ort.xyz/entity/ptolemy-s-inequality}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Ptolemy's inequality — https://4ort.xyz/entity/ptolemy-s-inequality (retrieved 2026-05-03)

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