NEWS
author wenzelm
Mon, 27 Jan 1997 09:08:54 +0100
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Isabelle NEWS -- history of user-visible changes
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================================================
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New in Isabelle94-8 (??????????? 1997 FIXME)
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* HOL: primrec now also works with type nat;
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* new utilities to build / run / maintain Isabelle etc. (in parts
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still somewhat experimental); old Makefiles etc. still functional;
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* simplifier: termless order as parameter; added interface for
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simplification procedures (functions that produce *proven* rewrite
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rules on the fly, depending on current redex);
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* now supports alternative (named) syntax tables (parser and pretty
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printer); internal interface is provided by add_modesyntax(_i);
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* Pure, FOL, ZF, HOL, HOLCF now support symbolic input and output; to
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be used in conjunction with the isabelle symbol font; uses the
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"symbols" syntax table;
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* infixes may now be declared with names independent of their syntax;
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* added typed_print_translation (like print_translation, but may
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access type of constant);
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* prlim command for dealing with lots of subgoals (an easier way of
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setting goals_limit);
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* HOL/ex/Ring.thy declares cring_simp, which solves equational
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problems in commutative rings, using axiomatic type classes for + and *;
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* ZF now has Fast_tac, Simp_tac and Auto_tac.  WARNING: don't use
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ZF.thy anymore!  Contains fewer defs and could make a bogus simpset.
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Beware of Union_iff.  eq_cs is gone, can be put back as ZF_cs addSIs
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[equalityI];
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* more examples in HOL/MiniML and HOL/Auth;
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* more default rewrite rules in HOL for quantifiers, union/intersection;
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* the NEWS file;
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New in Isabelle94-7 (November 96)
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* allowing negative levels (as offsets) in prlev and choplev;
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* super-linear speedup for large simplifications;
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* FOL, ZF and HOL now use miniscoping: rewriting pushes
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quantifications in as far as possible (COULD MAKE EXISTING PROOFS
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FAIL); can suppress it using the command Delsimps (ex_simps @
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all_simps); De Morgan laws are also now included, by default;
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* improved printing of ==>  :  ~:
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* new object-logic "Sequents" adds linear logic, while replacing LK
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and Modal (thanks to Sara Kalvala);
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* HOL/Auth: correctness proofs for authentication protocols;
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* HOL: new auto_tac combines rewriting and classical reasoning (many
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examples on HOL/Auth);
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* HOL: new command AddIffs for declaring theorems of the form P=Q to
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the rewriter and classical reasoner simultaneously;
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* function uresult no longer returns theorems in "standard" format;
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regain previous version by: val uresult = standard o uresult;
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New in Isabelle94-6
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* oracles -- these establish an interface between Isabelle and trusted
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external reasoners, which may deliver results as theorems;
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* proof objects (in particular record all uses of oracles);
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* Simp_tac, Fast_tac, etc. that refer to implicit simpset / claset;
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* "constdefs" section in theory files;
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* "primrec" section (HOL) no longer requires names;
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* internal type "tactic" now simply "thm -> thm Sequence.seq";
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New in Isabelle94-5
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* reduced space requirements;
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* automatic HTML generation from theories;
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* theory files no longer require "..." (quotes) around most types;
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* new examples, including two proofs of the Church-Rosser theorem;
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* non-curried (1994) version of HOL is no longer distributed;
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$Id$