For the purposes of the license agreement in the file COPYRIGHT, a 

'contributor' is anybody who is listed in this file (CONTRIBUTORS) or 

who is listed as an author in one of the source files of this Isabelle

distribution.

Contributions to Isabelle 2007

------------------------------

* August 2007: Brian Huffman, PSU

  HOL/Library/Boolean_Algebra and HOL/Library/Numeral_Type

* June 2007: Amine Chaieb, TUM

  Semiring normalization and Groebner Bases

* June 2007: Joe Hurd, Oxford

  Metis theorem-prover

* 2006/2007: Kong W. Susanto, Cambridge

  HOL: Metis prover integration.

* 2006/2007: Florian Haftmann, TUM

  Pure: generic code generator framework.

  Pure: class package.

  HOL: theory tuning, code generator setup.

* November 2006: Lukas Bulwahn, TUM

  HOL/function: method "lexicographic_order".

* October 2006: Stefan Hohe, TUM

  HOL-Algebra: ideals and quotients over rings.

* August 2006: Amine Chaieb, TUM

  Experimental support for generic reflection and reification in HOL.

* July 2006: Rafal Kolanski, NICTA

  Hex (0xFF) and binary (0b1011) numerals.

* May 2006: Klaus Aehlig, LMU

  Command 'normal_form': normalization by evaluation.

* May 2006: Amine Chaieb, TUM

  HOL-Complex: Ferrante and Rackoff Algorithm for linear real

  arithmetic.

* February 2006: Benjamin Porter, NICTA

  HOL and HOL-Complex: generalised mean value theorem, continuum is

  not denumerable, harmonic and arithmetic series, and denumerability

  of rationals.

* October 2005: Martin Wildmoser, TUM

  Sketch for Isar 'guess' element.

Contributions to Isabelle 2005

------------------------------

* September 2005: Lukas Bulwahn and Bernhard Haeupler, TUM

  HOL-Complex: Formalization of Taylor series.

* September 2005: Stephan Merz, Alwen Tiu, QSL Loria

  Components for SAT solver method using zChaff.

* September 2005: Ning Zhang and Christian Urban, LMU Munich

  A Chinese theory.

* September 2005: Bernhard Haeupler, TUM

  Method comm_ring for proving equalities in commutative rings.

* July/August 2005: Jeremy Avigad, Carnegie Mellon University

  Various improvements of the HOL and HOL-Complex library.

* July 2005: Florian Zuleger, Johannes Hoelzl, and Simon Funke, TUM

  Some structured proofs about completeness of real numbers.

* May 2005: Rafal Kolanski and Gerwin Klein, NICTA

  Improved retrieval of facts from theory/proof context.

* February 2005: Lucas Dixon, University of Edinburgh

  Improved subst method.

* 2005: Brian Huffman, OGI

  Various improvements of HOLCF.

  Some improvements of the HOL-Complex library.

* 2005: Claire Quigley and Jia Meng, University of Cambridge

  Some support for asynchronous communication with external provers

  (experimental).

* 2005: Florian Haftmann, TUM

  Contributions to document 'sugar'.

  Various ML combinators, notably linear functional transformations.

  Some cleanup of ML legacy.

  Additional antiquotations.

  Improved Isabelle web site.

* 2004/2005: David Aspinall, University of Edinburgh

  Various elements of XML and PGIP based communication with user

  interfaces (experimental).

* 2004/2005: Gerwin Klein, NICTA

  Contributions to document 'sugar'.

  Improved Isabelle web site.

  Improved HTML presentation of theories.

* 2004/2005: Clemens Ballarin, TUM

  Provers: tools for transitive relations and quasi orders.

  Improved version of locales, notably interpretation of locales.

  Improved version of HOL-Algebra.

* 2004/2005: Amine Chaieb, TUM

  Improved version of HOL presburger method.

* 2004/2005: Steven Obua, TUM

  Improved version of HOL/Import, support for HOL-Light.

  Improved version of HOL-Complex-Matrix.

  Pure/defs: more sophisticated checks on well-formedness of overloading.

  Pure/Tools: an experimental evaluator for lambda terms.

* 2004/2005: Norbert Schirmer, TUM

  Contributions to document 'sugar'.

  Improved version of HOL/record.

* 2004/2005: Sebastian Skalberg, TUM

  Improved version of HOL/Import.

  Some internal ML reorganizations.

* 2004/2005: Tjark Weber, TUM

  SAT solver method using zChaff.

  Improved version of HOL/refute.

$Id$