NEWS
author wenzelm
Tue, 03 Jun 1997 16:38:58 +0200
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ed941505cab7 Isabelle NEWS -- history of user-visible changes;
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Isabelle NEWS -- history of user-visible changes
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================================================
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New in Isabelle94-8 (May 1997)
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------------------------------
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*** General Changes ***
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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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* new 'Isabelle System Manual';
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* INSTALL text, together with ./configure and ./build scripts;
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* reimplemented type inference for greater efficiency, better error
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messages and clean internal interface;
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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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*** Syntax ***
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* 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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* added token_translation interface (may translate name tokens in
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arbitrary ways, dependent on their type (free, bound, tfree, ...) and
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the current print_mode); IMPORTANT: user print translation functions
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are responsible for marking newly introduced bounds
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(Syntax.mark_boundT);
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* token translations for modes "xterm" and "xterm_color" that display
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names in bold, underline etc. or colors (which requires a color
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version of xterm);
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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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*** Classical Reasoner ***
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Blast_tac: a new tactic!  It is often more powerful than fast_tac, but has
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some limitations.  Blast_tac...
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  + ignores addss, addbefore, addafter; this restriction is intrinsic
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  + ignores elimination rules that don't have the correct format
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	(the conclusion MUST be a formula variable)
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  + ignores types, which can make HOL proofs fail
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  + rules must not require higher-order unification, e.g. apply_type in ZF
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    [message "Function Var's argument not a bound variable" relates to this]
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  + its proof strategy is more general but can actually be slower
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* substitution with equality assumptions no longer permutes other
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assumptions;
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* minor changes in semantics of addafter (now called addaltern); renamed
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setwrapper to setWrapper and compwrapper to compWrapper; added safe wrapper
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(and access functions for it);
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* improved combination of classical reasoner and simplifier: 
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  + functions for handling clasimpsets
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  + improvement of addss: now the simplifier is called _after_ the
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    safe steps.
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  + safe variant of addss called addSss: uses safe simplifications
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    _during_ the safe steps. It is more complete as it allows multiple 
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    instantiations of unknowns (e.g. with slow_tac).
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*** Simplifier ***
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* added interface for simplification procedures (functions that
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produce *proven* rewrite rules on the fly, depending on current
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redex);
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* ordering on terms as parameter (used for ordered rewriting);
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* new functions delcongs, deleqcongs, and Delcongs. richer rep_ss;
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* 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
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functions setsolver and addsolver have been renamed to setSolver and
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addSolver; added safe_asm_full_simp_tac;
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*** HOL ***
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* a generic induction tactic `induct_tac' which works for all datatypes and
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also for type `nat';
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* a generic case distinction tactic `exhaust_tac' which works for all
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datatypes and also for type `nat';
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* each datatype comes with a function `size';
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* patterns in case expressions allow tuple patterns as arguments to
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constructors, for example `case x of [] => ... | (x,y,z)#ps => ...';
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* primrec now also works with type nat;
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* recdef: a new declaration form, allows general recursive functions to be
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defined in theory files.  See HOL/ex/Fib, HOL/ex/Primes, HOL/Subst/Unify.
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* the constant for negation has been renamed from "not" to "Not" to
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harmonize with FOL, ZF, LK, etc.;
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* HOL/ex/LFilter theory of a corecursive "filter" functional for
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infinite lists;
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* HOL/Modelcheck demonstrates invocation of model checker oracle;
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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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* more examples in HOL/MiniML and HOL/Auth;
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* more default rewrite rules for quantifiers, union/intersection;
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* a new constant `arbitrary == @x.False';
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* HOLCF/IOA replaces old HOL/IOA;
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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 internal 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 derived as theorems --> no visible changes ;
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*** ZF ***
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* ZF now has Fast_tac, Simp_tac and Auto_tac.  Union_iff is a now a default
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rewrite rule; this may affect some proofs.  eq_cs is gone but can be put back
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as ZF_cs addSIs [equalityI];
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New in Isabelle94-7 (November 96)
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---------------------------------
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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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* 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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* greatly reduced 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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$Id$