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Isabelle

higher-order logic (HOL) automated theorem prover
CreativeWork proof_assistant Q460340
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Isabelle

Summary

Isabelle is a proof assistant[1]. Isabelle has Wikipedia articles in 7 language editions, a strong signal of global cultural recognition.[2]

Key Facts

  • Isabelle's instance of is recorded as proof assistant[3].
  • Isabelle's instance of is recorded as free software[4].
  • Isabelle's developer is recorded as Technical University of Munich[5].
  • Isabelle's developer is recorded as University of Cambridge[6].
  • Isabelle's copyright license is recorded as BSD licenses[7].
  • Isabelle's programmed in is recorded as Standard ML[8].
  • Isabelle's programmed in is recorded as Scala[9].
  • Isabelle's operating system is recorded as Q3251801[10].
  • Isabelle's operating system is recorded as Microsoft Windows[11].
  • Isabelle's operating system is recorded as macOS[12].
  • Isabelle is used for mathematics[13].
  • 1986 marks the founding of Isabelle[14].
  • Isabelle's official website is recorded as http://isabelle.in.tum.de/[15].
  • Isabelle's readable file format is recorded as Isabelle file format[16].
  • Isabelle's writable file format is recorded as Isabelle file format[17].
  • Isabelle's Stack Exchange tag is recorded as https://proofassistants.stackexchange.com/tags/isabelle[18].
  • Isabelle's Stack Exchange tag is recorded as https://stackoverflow.com/tags/isabelle[19].
  • Isabelle's IRC channel URL is recorded as irc://irc.libera.chat/#isabelle[20].
  • Isabelle's maintained by WikiProject is recorded as WikiProject Software[21].
  • Isabelle's copyright status is recorded as copyrighted[22].

Why It Matters

Isabelle has Wikipedia articles in 7 language editions, a strong signal of global cultural recognition.[2]

Isabelle has been cited as an influence by Lean[23], an open-source software[24], founded in 2013[25].

FAQs

Who did Isabelle influence?

Isabelle has been cited as an influence by Lean[23].

Related Entities

free software Lean macOS mathematics Microsoft Windows Scala Standard ML Tobias Nipkow

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] ↑ . isabelle.in.tum.de. Retrieved . isabelle.in.tum.de. Provenance: wikidata.org.
  4. [6] ↑ . isabelle.in.tum.de. Retrieved . isabelle.in.tum.de. Provenance: wikidata.org.
  5. [7] ↑ . isabelle.in.tum.de. Retrieved . isabelle.in.tum.de. Provenance: wikidata.org.
  6. [8] ↑ . Open Hub. Retrieved . openhub.net. Provenance: wikidata.org.
  7. [9] ↑ . wikidata.org.
  8. [10] ↑ . isabelle.in.tum.de. Retrieved . isabelle.in.tum.de. Provenance: wikidata.org.
  9. [11] ↑ . isabelle.in.tum.de. Retrieved . isabelle.in.tum.de. Provenance: wikidata.org.
  10. [12] ↑ . isabelle.in.tum.de. Retrieved . isabelle.in.tum.de. Provenance: wikidata.org.
  11. [13] ↑ . wikidata.org.
  12. [14] ↑ . wikidata.org.
  13. [15] ↑ . wikidata.org.
  14. [16] ↑ . isabelle.in.tum.de. Retrieved . isabelle.in.tum.de. Provenance: wikidata.org.
  15. [17] ↑ . isabelle.in.tum.de. Retrieved . isabelle.in.tum.de. Provenance: wikidata.org.
  16. [18] ↑ . wikidata.org.
  17. [19] ↑ . wikidata.org.
  18. [20] ↑ . wikidata.org.
  19. [21] ↑ . wikidata.org.
  20. [22] ↑ . wikidata.org.

Inverse relationships (entities pointing at this one)

  1. [23] ↑ . wikidata.org. → on this site

Inline context (facts about related entities)

  1. [24] ↑ . Wikidata. wikidata.org. → on this site
  2. [25] ↑ . Wikidata. wikidata.org. → on this site

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] ↑ . 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). Isabelle. Retrieved May 3, 2026, from https://4ort.xyz/entity/isabelle-q460340
MLA “Isabelle.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/isabelle-q460340.
BibTeX @misc{4ortxyz_isabelle-q460340_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Isabelle}}, year = {2026}, url = {https://4ort.xyz/entity/isabelle-q460340}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Isabelle — https://4ort.xyz/entity/isabelle-q460340 (retrieved 2026-05-03)

Canonical URL: https://4ort.xyz/entity/isabelle-q460340 · Last refreshed:

Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

  1. 5w ago · The Anome · 2026-06-09 view diff on Wikidata ↗
    Programmed in → Standard ML, Scala
    Instance of → —
    Official website → http://isabelle.in.tum.de/
    Operating system → Q3251801, Microsoft Windows, macOS
    + 16 other properties edited (see Wikidata diff for full list)
    "/* wbsetclaim-update:2||1 */ [[Property:P31]]: [[Q140136520]]"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.