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