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Isabelle

higher-order logic (HOL) proof assistant
CreativeWork proof_assistant Q460340

Facts

12 properties
Instance of
proof assistant, free software, automated theorem prover[2][3]
Inception
1986[13]
Official website
isabelle.in.tum.de[14]
Has use
mathematics[12]
Copyright license
BSD licenses[6]
Copyright status
copyrighted[18]
Developer
Technical University of Munich, University of Cambridge[4][5]
Maintained by WikiProject
WikiProject Software[17]
Operating system
GNU/Linux, Microsoft Windows, macOS[9][10][11]
Programmed in
Standard ML, Scala[7][8]
Readable file format
Isabelle file format[15]
Writable file format
Isabelle file format[16]
🏷️ Also known as
en Isabelle
🔖 Identifiers · 7
Image (Wikimedia Commons)
Isabelle jedit.png ↗
Freebase ID
/m/015gp5
IRC channel URL
irc://irc.libera.chat/#isabelle
NLab ID
Isabelle
Open Hub ID
isabelle
Stack Exchange tag
proofassistants.stackexchange.com, stackoverflow.com
SwMATH work ID
454

Report an error or request removal Lineage (PROV-JSON)

🔗 Connections
Developer 2
University of Cambridge, Technical University of Munich
Instance of 2
free software, proof assistant
Operating system 2
Microsoft Windows, macOS
Programmed in 2
Scala, Standard ML
Copyright license 1
BSD licenses
Created notable works 1
Tobias Nipkow
Has use 1
mathematics
Influenced 1
Lean
Maintained by WikiProject 1
WikiProject Software
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Summary

Isabelle is a proof assistant[1].

Why It Matters

Isabelle has been cited as an influence by Lean[19], an open-source software[20], founded in 2013[21].

FAQs

Who did Isabelle influence?

Isabelle has been cited as an influence by Lean[19].

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. [2] ↑ . wikidata.org.
  2. [3] ↑ . wikidata.org.
  3. [4] ↑ . isabelle.in.tum.de. Retrieved . isabelle.in.tum.de. Provenance: wikidata.org.
  4. [5] ↑ . isabelle.in.tum.de. Retrieved . isabelle.in.tum.de. Provenance: wikidata.org.
  5. [6] ↑ . isabelle.in.tum.de. Retrieved . isabelle.in.tum.de. Provenance: wikidata.org.
  6. [7] ↑ . Open Hub. Retrieved . openhub.net. Provenance: wikidata.org.
  7. [8] ↑ . wikidata.org.
  8. [9] ↑ . isabelle.in.tum.de. Retrieved . isabelle.in.tum.de. Provenance: wikidata.org.
  9. [10] ↑ . isabelle.in.tum.de. Retrieved . isabelle.in.tum.de. Provenance: wikidata.org.
  10. [11] ↑ . isabelle.in.tum.de. Retrieved . isabelle.in.tum.de. Provenance: wikidata.org.
  11. [12] ↑ . wikidata.org.
  12. [13] ↑ . wikidata.org.
  13. [14] ↑ . wikidata.org.
  14. [15] ↑ . isabelle.in.tum.de. Retrieved . isabelle.in.tum.de. Provenance: wikidata.org.
  15. [16] ↑ . isabelle.in.tum.de. Retrieved . isabelle.in.tum.de. Provenance: wikidata.org.
  16. [17] ↑ . wikidata.org.
  17. [18] ↑ . wikidata.org.

Inverse relationships (entities pointing at this one)

  1. [19] ↑ . wikidata.org. → on this site

Inline context (facts about related entities)

  1. [20] ↑ . Wikidata. wikidata.org. → on this site
  2. [21] ↑ . Wikidata. wikidata.org. → on this site

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). Isabelle. Retrieved November 6, 2026, from https://4ort.xyz/entity/isabelle-q460340
MLA “Isabelle.” 4ort.xyz Knowledge Graph, 4ort.xyz, 6 Nov. 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: 2026-11-06}}
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 2026-11-06)

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. 21w 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 → GNU/Linux, Microsoft Windows, macOS
    + 16 other properties edited (see Wikidata diff for full list)
    "/* wbsetclaim-update:2||1 */ Instance of: automated theorem prover"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.