NEWS
author wenzelm
Fri, 28 Feb 1997 16:54:32 +0100
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================================================
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New in Isabelle94-8 (really-soon-now 1997 FIXME)
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* HOLCF changes: derived all rules and arities 
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  + axiomatic type classes instead of classes 
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  + typedef instead of faking type definitions
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  + eliminated the initernal constants less_fun, less_cfun, UU_fun, UU_cfun etc.
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  + new axclasses cpo,chfin,flat with flat<chfin<pcpo<cpo<po
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  + eliminated the types void, one, tr
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  + use unit lift and bool lift (with translations) instead of one and tr
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  + eliminated blift from Lift3.thy (use Def instead of blift)
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  all eliminated rules are derivd as theorems --> no visible changes 
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* simplifier: new functions delcongs, deleqcongs, and Delcongs. richer rep_ss.
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* simplifier: the solver is now split into a safe and an unsafe part.
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  This should be invisible for the normal user, except that the functions
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  setsolver and addsolver have been renamed to setSolver and addSolver.
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  added safe_asm_full_simp_tac. 
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* classical reasoner: little changes in semantics of addafter (now: addaltern),
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  renamed setwrapper to setWrapper, addwrapper to addWrapper
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  added safe wrapper (and access functions for it)
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* improved combination of classical reasoner and simplifier: 
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  new addss, auto_tac, functions for handling clasimpsets, ...
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  Now, the simplification is safe (therefore moved to safe_step_tac) and thus
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  more complete, as multiple instantiation of unknowns (with slow_tac) possible
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  COULD MAKE EXISTING PROOFS FAIL; in case of problems with unstable old proofs:
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                                   use unsafe_addss and unsafe_auto_tac
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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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New in Isabelle94-4
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* greatly space requirements;
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* theory files (.thy) no longer require \...\ escapes at line breaks;
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* searchable theorem database (see the section "Retrieving theorems" on 
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page 8 of the Reference Manual);
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* new examples, including Grabczewski's monumental case study of the
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Axiom of Choice;
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* The previous version of HOL renamed to Old_HOL;
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* The new version of HOL (previously called CHOL) uses a curried syntax 
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for functions.  Application looks like f a b instead of f(a,b);
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* Mutually recursive inductive definitions finally work in HOL;
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* In ZF, pattern-matching on tuples is now available in all abstractions and
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translates to the operator "split";
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New in Isabelle94-3
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* new infix operator, addss, allowing the classical reasoner to 
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perform simplification at each step of its search.  Example:
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	fast_tac (cs addss ss)
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* a new logic, CHOL, the same as HOL, but with a curried syntax 
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for functions.  Application looks like f a b instead of f(a,b).  Also pairs 
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look like (a,b) instead of <a,b>;
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* PLEASE NOTE: CHOL will eventually replace HOL!
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* In CHOL, pattern-matching on tuples is now available in all abstractions.
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It translates to the operator "split".  A new theory of integers is available;
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* In ZF, integer numerals now denote two's-complement binary integers.
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Arithmetic operations can be performed by rewriting.  See ZF/ex/Bin.ML;
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* Many new examples: I/O automata, Church-Rosser theorem, equivalents 
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of the Axiom of Choice;
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New in Isabelle94-2
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* Significantly faster resolution;  
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* the different sections in a .thy file can now be mixed and repeated
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freely;
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* Database of theorems for FOL, HOL and ZF.  New
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commands including qed, qed_goal and bind_thm store theorems in the database.
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* Simple database queries: return a named theorem (get_thm) or all theorems of
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a given theory (thms_of), or find out what theory a theorem was proved in
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(theory_of_thm);
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* Bugs fixed in the inductive definition and datatype packages;
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* The classical reasoner provides deepen_tac and depth_tac, making FOL_dup_cs
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and HOL_dup_cs obsolete;
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* Syntactic ambiguities caused by the new treatment of syntax in Isabelle94-1
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have been removed;
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* Simpler definition of function space in ZF;
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* new results about cardinal and ordinal arithmetic in ZF;
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* 'subtype' facility in HOL for introducing new types as subsets of existing
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types;
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2553
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$Id$