What is Isabelle?
Isabelle is a generic proof assistant. It allows mathematical formulas to be expressed in a formal language and provides tools for proving those formulas in a logical calculus. Isabelle is developed at University of Cambridge (Larry Paulson), Technische Universität München (Tobias Nipkow) and Université Paris-Sud (Makarius Wenzel). See the Isabelle overview for a brief introduction.
Now available: Isabelle2012
Download for 32-bit Linux
Download for Mac OS X
Download for WindowsSome highlights:
- Improved Isabelle/jEdit Prover IDE (PIDE).
- Support for block-structured specification contexts.
- Discontinued old code generator.
- Updated manuals:
prog-prove,isar-ref,implementation,system. - HOL: type
'a setis proper type constructor again. - HOL: improved representation of numerals.
- HOL: new transfer and lifting packages, improved quotient package.
- HOL tool enhancements: Quickcheck, Nitpick, Sledgehammer.
- HOL library enhancements, including HOL-Library and HOL-Probability.
- HOL: more TPTP support.
- Re-implementation of HOL-Import for HOL-Light.
- ZF: some modernization of notation and proofs.
- System integration: improved support of Windows platform.
See also the cumulative NEWS.
Distribution & Support
Isabelle is distributed for free under the BSD license. It includes source and binary packages and documentation, see the detailed installation instructions. A vast collection of Isabelle examples and applications is available from the Archive of Formal Proofs.
Support is available by ample documentation, the Isabelle community Wiki, and the following mailing lists:
- {isabelle-users} AT [cl.cam.ac.uk] provides a forum for Isabelle users to discuss problems, exchange information, and make announcements. Users of official Isabelle releases should subscribe or see the archive (also available via Google groups).
- {isabelle-dev} AT [in.tum.de] covers the Isabelle development process, including intermediate repository versions, and administrative issues concerning the website or testing infrastructure. Early adopters of development snapshots or repository versions should subscribe or see the archive (also available at mail-archive.com or gmane.org).