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.

* Robust treatment of concrete syntax for different logical entities;

mixfix syntax in local proof context.

* Type declarations and notation within local theory context.

* HOL: package for quotient types.

* HOL code generation: simple concept for abstract datatypes obeying

invariants (e.g. red-black trees).

* HOL: new development of the Reals using Cauchy Sequences.

* HOL: reorganization of abstract algebra type class hierarchy.

* HOL: substantial reorganization of main library and related tools.

* HOLCF: reorganization of 'domain' package.

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/