Subject: Announcing Isabelle2009-2
To: isabelle-users@cl.cam.ac.uk
Isabelle2009-2 is now available.
This release improves upon Isabelle2009-1 in many respects, see the
NEWS file in the distribution for more details. Some notable changes
are:
* Explicit proof terms for type class reasoning.
* Authentic syntax for *all* logical entities (type classes, type
constructors, term constants): provides simple and robust
correspondence between formal entities and concrete syntax.
* HOL: Package for constructing quotient types.
* HOL: Code generation now with simple concept for abstract
datatypes obeying invariants; applications for typical data structures
(e.g. search trees) can be found in the library.
* HOL: New development of the Reals using Cauchy Sequences.
* HOL: Reorganization of abstract algebra type class hierarchy.
* Commands 'types', 'typedecl' and 'typedef' now work within a local theory
context -- without introducing dependencies on parameters or
assumptions.
You may get Isabelle2009-2 from the following mirror sites:
Cambridge (UK) http://www.cl.cam.ac.uk/research/hvg/Isabelle/
Munich (Germany) http://isabelle.in.tum.de/
Sydney (Australia) http://mirror.cse.unsw.edu.au/pub/isabelle/