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Sommerfeld identity

theorem
Intangible theorem Q784909
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Sommerfeld identity

Summary

Sommerfeld identity is a theorem[1]. It draws 13 Wikipedia views per month (theorem category, ranking #266 of 1,306).[2]

Key Facts

  • Sommerfeld identity's instance of is recorded as theorem[3].
  • Arnold Sommerfeld is named after Sommerfeld identity[4].
  • Sommerfeld identity's Freebase ID is recorded as /m/09rvyy[5].
  • Sommerfeld identity's defining formula is recorded as f(z + u) = f(z + v) = f(z)[6].
  • Sommerfeld identity's maintained by WikiProject is recorded as WikiProject Mathematics[7].
  • Sommerfeld identity's Microsoft Academic ID is recorded as 2777650409[8].

Why It Matters

Sommerfeld identity draws 13 Wikipedia views per month (theorem category, ranking #266 of 1,306).[2] It has Wikipedia articles in 5 language editions, a strong signal of global cultural recognition.[9]

Related Entities

Arnold Sommerfeld

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). Sommerfeld identity. Retrieved May 3, 2026, from https://4ort.xyz/entity/sommerfeld-identity
MLA “Sommerfeld identity.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/sommerfeld-identity.
BibTeX @misc{4ortxyz_sommerfeld-identity_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Sommerfeld identity}}, year = {2026}, url = {https://4ort.xyz/entity/sommerfeld-identity}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Sommerfeld identity — https://4ort.xyz/entity/sommerfeld-identity (retrieved 2026-05-03)

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