Subject: Announcing Isabelle2003
To: isabelle-users@cl.cam.ac.uk
Isabelle2003 is now available.
This release provides many improvements and a few substantial advances over
Isabelle2002. The most prominent highlights of Isabelle2003 are as follows
(see the NEWS of the distribution for more details):
* New framework for extracting programs from constructive proofs in HOL.
(Berghofer)
* Improved simplifier. The premises of a goal are completely
interreduced, ie simplified wrt each other. (Berghofer)
* Presburger arithmetic. Method arith can deal with quantified formulae over
nat and int, and with mod, div and dvd wrt a numeral. (Chaieb and Nipkow)
* New command to find all rules whose conclusion matches the current goal.
* New command to trace why unification failed.
* Locales (named proof contexts). The new implementation is fully
integrated with Isar's notion of proof context, and locale specifications
produce predicate definitions that allow to work with locales in more
flexible ways. (Wenzel)
* HOL/Algebra: proofs in classical algebra. Intended as a base for all
algebraic developments in HOL. Currently covers group and ring theory.
(Ballarin, Kammüller, Paulson)
* HOL/Complex defines the type "complex" of the complex numbers, with numeric
constants and some complex analysis, including nonstandard analysis. The
image HOL-Complex should be used for developments involving the real
numbers too. Gauge integration and hyperreal logarithms have recently
been added. (Fleuriot)
* HOL/NumberTheory: added Gauss's law of quadratic reciprocity. (Avigad,
Gray and Kramer)
* ZF/Constructible: Gödel's proof of the relative consistency of the axiom
of choice is mechanized using Isabelle/ZF, following, Kunen's famous
textbook "Set Theory". (Paulson)
You may get Isabelle2003 from any of the following mirror sites:
Cambridge (UK) http://www.cl.cam.ac.uk/Research/HVG/Isabelle/dist/
Munich (Germany) http://isabelle.in.tum.de/dist/