1 Subject: Announcing Isabelle2003 
1 Subject: Announcing Isabelle2004 
2 To: isabelleusers@cl.cam.ac.uk 
2 To: isabelleusers@cl.cam.ac.uk 
3 
3 
4 Isabelle2003 is now available. 
4 Isabelle2004 is now available. 
5 
5 
6 This release provides many improvements and a few substantial advances over 
6 This release provides many improvements and a few substantial advances over 
7 Isabelle2002. The most prominent highlights of Isabelle2003 are as follows 
7 Isabelle2003. The most prominent highlights of Isabelle2004 are as follows 
8 (see the NEWS of the distribution for more details): 
8 (see the NEWS of the distribution for more details): 
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9 
10 * New framework for extracting programs from constructive proofs in HOL. 

11 (Berghofer) 

12 
10 
13 * Improved simplifier. The premises of a goal are completely 
11 * New theory Ring_and_Field with over 250 basic numerical laws, 
14 interreduced, ie simplified wrt each other. (Berghofer) 
12 all proved in axiomatic type classes for semirings, rings and fields. 
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13 
16 * Presburger arithmetic. Method arith can deal with quantified formulae over 
14 * Type "rat" of the rational numbers available in HOLComplex. 
17 nat and int, and with mod, div and dvd wrt a numeral. (Chaieb and Nipkow) 

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15 
19 * New command to find all rules whose conclusion matches the current goal. 
16 * New locale "ring" for noncommutative rings in HOLAlgebra. 
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17 
21 * New command to trace why unification failed. 
18 * New theory of matrices with an application to linear programming in 

19 HOLMatrix. 
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23 * Locales (named proof contexts). The new implementation is fully 
21 * Improved locales (named proof contexts), instantiation of locales. 
24 integrated with Isar's notion of proof context, and locale specifications 

25 produce predicate definitions that allow to work with locales in more 

26 flexible ways. (Wenzel) 

27 
22 
28 * HOL/Algebra: proofs in classical algebra. Intended as a base for all 
23 * Improved handling of linear and partial orders in simplifier. 
29 algebraic developments in HOL. Currently covers group and ring theory. 
24 
30 (Ballarin, Kammüller, Paulson) 
25 * New "specification" command for definition by specification. 
31 
26 
32 * HOL/Complex defines the type "complex" of the complex numbers, with numeric 
27 * New Isar command "finalconsts" prevents constants being given a definition 
33 constants and some complex analysis, including nonstandard analysis. The 
28 later. 
34 image HOLComplex should be used for developments involving the real 

35 numbers too. Gauge integration and hyperreal logarithms have recently 

36 been added. (Fleuriot) 

37 
29 
38 * HOL/NumberTheory: added Gauss's law of quadratic reciprocity. (Avigad, 
30 * Command "arith" now generates counterexamples for reals as well. 
39 Gray and Kramer) 

40 
31 
41 * ZF/Constructible: Gödel's proof of the relative consistency of the axiom 
32 * New "quickcheck" command to search for counterexamples of executable goals. 
42 of choice is mechanized using Isabelle/ZF, following Kunen's wellknown 
33 (see HOL/ex/Quickcheck_Examples.thy) 
43 textbook "Set Theory". (Paulson) 
34 

35 * New "refute" command to search for finite countermodels of goals. 

36 (see HOL/ex/Refute_Examples.thy) 

37 

38 * Presentation and xsymbol enhancements, greek letters and sub/superscripts 

39 allowed in identifiers. 

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44 
41 
45 You may get Isabelle2003 from the following mirror sites: 
42 You may get Isabelle2003 from the following mirror sites: 
46 
43 
47 Cambridge (UK) http://www.cl.cam.ac.uk/Research/HVG/Isabelle/dist/ 
44 Cambridge (UK) http://www.cl.cam.ac.uk/Research/HVG/Isabelle/dist/ 
48 Munich (Germany) http://isabelle.in.tum.de/dist/ 
45 Munich (Germany) http://isabelle.in.tum.de/dist/ 