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Barcan formula

Schema in modal logic
Intangible Formula Q3748370

Facts

5 properties
Instance of
formula
Defining formula
\forall x \Box Fx \rightarrow \Box \forall x Fx[4]
Discoverer or inventor
Ruth Barcan Marcus[2]
Maintained by WikiProject
WikiProject Mathematics[5]
Named after
Ruth Barcan Marcus[3]
🏷️ Also known as
en Barcan formula de Barcan-Formel es Fórmula de Barcan he נוסחת ברקן it Formula di Barcan
🔖 Identifiers · 4
Freebase ID
/m/01kh_j
JSTOR topic ID (archived)
barcan-formula
Microsoft Academic ID (discontinued)
38977897
NLab ID
Barcan formula

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Summary

Barcan formula is a formula[1].

References

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

Direct Wikidata claims

  1. [2] ↑ . wikidata.org.
  2. [3] ↑ . wikidata.org.
  3. [4] ↑ . wikidata.org.
  4. [5] ↑ . wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. 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). Barcan formula. Retrieved November 11, 2026, from https://4ort.xyz/entity/barcan-formula
MLA “Barcan formula.” 4ort.xyz Knowledge Graph, 4ort.xyz, 11 Nov. 2026, https://4ort.xyz/entity/barcan-formula.
BibTeX @misc{4ortxyz_barcan-formula_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Barcan formula}}, year = {2026}, url = {https://4ort.xyz/entity/barcan-formula}, note = {Accessed: 2026-11-11}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Barcan formula — https://4ort.xyz/entity/barcan-formula (retrieved 2026-11-11)

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