--- a/ANNOUNCE Sat Apr 17 13:56:59 2004 +0200
+++ b/ANNOUNCE Sat Apr 17 14:51:00 2004 +0200
@@ -1,46 +1,43 @@
-Subject: Announcing Isabelle2003
+Subject: Announcing Isabelle2004
To: isabelle-users@cl.cam.ac.uk
-Isabelle2003 is now available.
+Isabelle2004 is now available.
This release provides many improvements and a few substantial advances over
-Isabelle2002. The most prominent highlights of Isabelle2003 are as follows
+Isabelle2003. The most prominent highlights of Isabelle2004 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)
+* New theory Ring_and_Field with over 250 basic numerical laws,
+ all proved in axiomatic type classes for semirings, rings and fields.
+
+* Type "rat" of the rational numbers available in HOL-Complex.
- * 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 locale "ring" for non-commutative rings in HOL-Algebra.
- * New command to find all rules whose conclusion matches the current goal.
+* New theory of matrices with an application to linear programming in
+ HOL-Matrix.
- * New command to trace why unification failed.
+* Improved locales (named proof contexts), instantiation of locales.
- * 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)
+* Improved handling of linear and partial orders in simplifier.
+
+* New "specification" command for definition by specification.
- * 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)
+* New Isar command "finalconsts" prevents constants being given a definition
+ later.
+
+* Command "arith" now generates counterexamples for reals as well.
- * 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)
+* New "quickcheck" command to search for counterexamples of executable goals.
+ (see HOL/ex/Quickcheck_Examples.thy)
- * HOL/NumberTheory: added Gauss's law of quadratic reciprocity. (Avigad,
- Gray and Kramer)
+* New "refute" command to search for finite countermodels of goals.
+ (see HOL/ex/Refute_Examples.thy)
- * ZF/Constructible: Gödel's proof of the relative consistency of the axiom
- of choice is mechanized using Isabelle/ZF, following Kunen's well-known
- textbook "Set Theory". (Paulson)
+* Presentation and x-symbol enhancements, greek letters and sub/superscripts
+ allowed in identifiers.
+
You may get Isabelle2003 from the following mirror sites: