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: Isabelle2011-1
Notable changes:
- Significantly improved Isabelle/jEdit Prover IDE (PIDE).
- Improved system integration with Isabelle/Scala: YXML data encoding.
- Improved parallel performance and scalability.
- Improved document preparation: embedded rail-road diagrams.
- HOL tool enhancements: Quickcheck, Nitpick, Sledgehammer, SMT/Z3 integration.
- Numerous HOL library improvements: main HOL, HOLCF, HOL-Library, Multivariate_Analysis, Probability.
- Updated and extended Isabelle/Isar reference manual.
See also the cumulative NEWS.
Download & Support
Isabelle is distributed for free under the BSD license. It includes source and binary packages and documentation, see the 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).