NEWS
author wenzelm
Mon, 22 Jun 1998 17:26:46 +0200
changeset 5069 3ea049f7979d
parent 5059 dcdb21e53537
child 5072 255324b49a1c
permissions -rw-r--r--
isatool fixgoal;
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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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================================================
ed941505cab7 Isabelle NEWS -- history of user-visible changes;
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New in this Isabelle version
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----------------------------
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*** General Changes ***
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* Simplifier:
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 -Asm_full_simp_tac is now more aggressive:
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  1. It will sometimes reorient premises if that increases their power to
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     simplify.
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  2. It does no longer proceed strictly from left to right but may also
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     rotate premises to achieve further simplification.
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  For compatibility reasons there is now Asm_lr_simp_tac which is like the
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  old Asm_full_simp_tac in that it does not rotate premises.
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* Changed wrapper mechanism for the classical reasoner now allows for
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selected deletion of wrappers, by introduction of names for wrapper
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functionals.  This implies that addbefore, addSbefore, addaltern, and
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addSaltern now take a pair (name, tactic) as argument, and that adding
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two tactics with the same name overwrites the first one (emitting a
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warning).
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  type wrapper = (int -> tactic) -> (int -> tactic)
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  setWrapper, setSWrapper, compWrapper and compSWrapper are replaced by
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  addWrapper, addSWrapper: claset * (string * wrapper) -> claset
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  delWrapper, delSWrapper: claset *  string            -> claset
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  getWrapper is renamed to appWrappers, getSWrapper to appSWrappers;
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* new toplevel commands `Goal' and `Goalw' that improve upon `goal' and
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`goalw': the theory is no longer needed as an explicit argument - the current
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theory is used; assumptions are no longer returned at the ML-level unless one
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of them starts with ==> or !!. It is recommended to convert to these new
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commands.
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* inductive definitions now handle disjunctive premises correctly (HOL
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and ZF);
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* new toplevel commands 'thm' and 'thms' for retrieving theorems from
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the current theory context;
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* new toplevel commands `Goal' and `Goalw' that improve upon `goal'
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and `goalw': the theory is no longer needed as an explicit argument -
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the current theory is used; assumptions are no longer returned at the
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ML-level unless one of them starts with ==> or !!; it is recommended
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to convert to these new commands using isatool fixgoal (as usual,
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backup your sources first!);
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* new theory section 'nonterminals';
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* new theory section 'setup';
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*** HOL ***
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* HOL/record: now includes concrete syntax for record terms (still
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lacks important theorems, like surjective pairing and split);
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* new force_tac (and its derivations Force_tac, force): combines
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rewriting and classical reasoning (and whatever other tools) similarly
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to auto_tac, but is aimed to solve the given subgoal totally;
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* added option_map_eq_Some to simpset() and claset()
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* New theory HOL/Update of function updates:
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  f[a:=b] == %x. if x=a then b else f x
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* New directory HOL/UNITY: Chandy and Misra's UNITY formalism
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* split_all_tac is now much faster and fails if there is nothing to
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split.  Existing (fragile) proofs may require adaption because the
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order and the names of the automatically generated variables have
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changed.  split_all_tac has moved within claset() from usafe wrappers
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to safe wrappers, which means that !!-bound variables are splitted
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much more aggressively, and safe_tac and clarify_tac now split such
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variables.  If this splitting is not appropriate, use delSWrapper
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"split_all_tac".
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* added disj_not1 = "(~P | Q) = (P --> Q)" to the default simpset;
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* HOL/Arithmetic:
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  - removed 'pred' (predecessor) function
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  - generalized some theorems about n-1
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  - Many new laws about "div" and "mod"
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  - New laws about greatest common divisors (see theory ex/Primes)
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* HOL/Relation: renamed the relational operatotr r^-1 "converse"
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instead of "inverse";
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* recdef can now declare non-recursive functions, with {} supplied as
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the well-founded relation;
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* expand_if, expand_split, expand_sum_case and expand_nat_case are now called
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  split_if, split_split, split_sum_case and split_nat_case
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  (to go with add/delsplits).
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* Simplifier:
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 -Rewrite rules for case distinctions can now be added permanently to the
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  default simpset using Addsplits just like Addsimps. They can be removed via
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  Delsplits just like Delsimps. Lower-case versions are also available.
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 -The rule split_if is now part of the default simpset. This means that
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  the simplifier will eliminate all ocurrences of if-then-else in the
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  conclusion of a goal. To prevent this, you can either remove split_if
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  completely from the default simpset by `Delsplits [split_if]' or
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  remove it in a specific call of the simplifier using
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  `... delsplits [split_if]'.
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  You can also add/delete other case splitting rules to/from the default
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  simpset: every datatype generates suitable rules `split_t_case' and
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  `split_t_case_asm' (where t is the name of the datatype).
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* new theory Vimage (inverse image of a function, syntax f-``B);
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* many new identities for unions, intersections, set difference, etc.;
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*** ZF ***
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* in  let x=t in u(x), neither t nor u(x) has to be an FOL term.
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*** Internal changes ***
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* improved the theory data mechanism to support encapsulation (data
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kind name replaced by private Object.kind, acting as authorization
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key); new type-safe user interface via functor TheoryDataFun;
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7b4c2a153738 * improved the theory data mechanism to support real encapsulation;
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7b4c2a153738 * improved the theory data mechanism to support real encapsulation;
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New in Isabelle98 (January 1998)
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--------------------------------
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*** Overview of INCOMPATIBILITIES (see below for more details) ***
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* changed lexical syntax of terms / types: dots made part of long
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identifiers, e.g. "%x.x" no longer possible, should be "%x. x";
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* simpset (and claset) reference variable replaced by functions
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simpset / simpset_ref;
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* no longer supports theory aliases (via merge) and non-trivial
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implicit merge of thms' signatures;
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* most internal names of constants changed due to qualified names;
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* changed Pure/Sequence interface (see Pure/seq.ML);
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*** General Changes ***
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* hierachically structured name spaces (for consts, types, axms, thms
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etc.); new lexical class 'longid' (e.g. Foo.bar.x) may render much of
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old input syntactically incorrect (e.g. "%x.x"); COMPATIBILITY:
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isatool fixdots ensures space after dots (e.g. "%x. x"); set
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long_names for fully qualified output names; NOTE: ML programs
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(special tactics, packages etc.) referring to internal names may have
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to be adapted to cope with fully qualified names; in case of severe
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backward campatibility problems try setting 'global_names' at compile
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time to have enrything declared within a flat name space; one may also
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fine tune name declarations in theories via the 'global' and 'local'
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section;
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* reimplemented the implicit simpset and claset using the new anytype
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data filed in signatures; references simpset:simpset ref etc. are
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replaced by functions simpset:unit->simpset and
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simpset_ref:unit->simpset ref; COMPATIBILITY: use isatool fixclasimp
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to patch your ML files accordingly;
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* HTML output now includes theory graph data for display with Java
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applet or isatool browser; data generated automatically via isatool
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usedir (see -i option, ISABELLE_USEDIR_OPTIONS);
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* defs may now be conditional; improved rewrite_goals_tac to handle
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conditional equations;
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* defs now admits additional type arguments, using TYPE('a) syntax;
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* theory aliases via merge (e.g. M=A+B+C) no longer supported, always
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creates a new theory node; implicit merge of thms' signatures is
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restricted to 'trivial' ones; COMPATIBILITY: one may have to use
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transfer:theory->thm->thm in (rare) cases;
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* improved handling of draft signatures / theories; draft thms (and
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ctyps, cterms) are automatically promoted to real ones;
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* slightly changed interfaces for oracles: admit many per theory, named
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(e.g. oracle foo = mlfun), additional name argument for invoke_oracle;
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* print_goals: optional output of const types (set show_consts and
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show_types);
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* improved output of warnings (###) and errors (***);
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* subgoal_tac displays a warning if the new subgoal has type variables;
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* removed old README and Makefiles;
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* replaced print_goals_ref hook by print_current_goals_fn and result_error_fn;
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* removed obsolete init_pps and init_database;
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* deleted the obsolete tactical STATE, which was declared by
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    fun STATE tacfun st = tacfun st st;
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* cd and use now support path variables, e.g. $ISABELLE_HOME, or ~
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(which abbreviates $HOME);
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* changed Pure/Sequence interface (see Pure/seq.ML); COMPATIBILITY:
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use isatool fixseq to adapt your ML programs (this works for fully
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qualified references to the Sequence structure only!);
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* use_thy no longer requires writable current directory; it always
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reloads .ML *and* .thy file, if either one is out of date;
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*** Classical Reasoner ***
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* Clarify_tac, clarify_tac, clarify_step_tac, Clarify_step_tac: new
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tactics that use classical reasoning to simplify a subgoal without
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splitting it into several subgoals;
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* Safe_tac: like safe_tac but uses the default claset;
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*** Simplifier ***
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* added simplification meta rules:
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    (asm_)(full_)simplify: simpset -> thm -> thm;
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* simplifier.ML no longer part of Pure -- has to be loaded by object
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logics (again);
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* added prems argument to simplification procedures;
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* HOL, FOL, ZF: added infix function `addsplits':
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  instead of `<simpset> setloop (split_tac <thms>)'
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  you can simply write `<simpset> addsplits <thms>'
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*** Syntax ***
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* TYPE('a) syntax for type reflection terms;
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* no longer handles consts with name "" -- declare as 'syntax' instead;
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* pretty printer: changed order of mixfix annotation preference (again!);
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* Pure: fixed idt/idts vs. pttrn/pttrns syntactic categories;
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*** HOL ***
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* HOL: there is a new splitter `split_asm_tac' that can be used e.g. 
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  with `addloop' of the simplifier to faciliate case splitting in premises.
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* HOL/TLA: Stephan Merz's formalization of Lamport's Temporal Logic of Actions;
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* HOL/Auth: new protocol proofs including some for the Internet
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  protocol TLS;
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* HOL/Map: new theory of `maps' a la VDM;
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* HOL/simplifier: simplification procedures nat_cancel_sums for
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cancelling out common nat summands from =, <, <= (in)equalities, or
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differences; simplification procedures nat_cancel_factor for
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cancelling common factor from =, <, <= (in)equalities over natural
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sums; nat_cancel contains both kinds of procedures, it is installed by
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default in Arith.thy -- this COULD MAKE EXISTING PROOFS FAIL;
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* HOL/simplifier: terms of the form
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  `? x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x)'  (or t=x)
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  are rewritten to
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  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t)',
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  and those of the form
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  `! x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x) --> R(x)'  (or t=x)
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  are rewritten to
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  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t) --> R(t)',
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* HOL/datatype
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  Each datatype `t' now comes with a theorem `split_t_case' of the form
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  P(t_case f1 ... fn x) =
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     ( (!y1 ... ym1. x = C1 y1 ... ym1 --> P(f1 y1 ... ym1)) &
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        ...
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       (!y1 ... ymn. x = Cn y1 ... ymn --> P(f1 y1 ... ymn))
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     )
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  and a theorem `split_t_case_asm' of the form
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  P(t_case f1 ... fn x) =
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    ~( (? y1 ... ym1. x = C1 y1 ... ym1 & ~P(f1 y1 ... ym1)) |
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        ...
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       (? y1 ... ymn. x = Cn y1 ... ymn & ~P(f1 y1 ... ymn))
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     )
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  which can be added to a simpset via `addsplits'. The existing theorems
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  expand_list_case and expand_option_case have been renamed to
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  split_list_case and split_option_case.
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* HOL/Arithmetic:
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  - `pred n' is automatically converted to `n-1'.
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    Users are strongly encouraged not to use `pred' any longer,
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    because it will disappear altogether at some point.
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  - Users are strongly encouraged to write "0 < n" rather than
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    "n ~= 0". Theorems and proof tools have been modified towards this
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    `standard'.
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* HOL/Lists:
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  the function "set_of_list" has been renamed "set" (and its theorems too);
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  the function "nth" now takes its arguments in the reverse order and
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  has acquired the infix notation "!" as in "xs!n".
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* HOL/Set: UNIV is now a constant and is no longer translated to Compl{};
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* HOL/Set: The operator (UN x.B x) now abbreviates (UN x:UNIV. B x) and its
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  specialist theorems (like UN1_I) are gone.  Similarly for (INT x.B x);
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* HOL/record: extensible records with schematic structural subtyping
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(single inheritance); EXPERIMENTAL version demonstrating the encoding,
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still lacks various theorems and concrete record syntax;
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*** HOLCF ***
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* removed "axioms" and "generated by" sections;
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* replaced "ops" section by extended "consts" section, which is capable of
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  handling the continuous function space "->" directly;
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* domain package:
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  . proves theorems immediately and stores them in the theory,
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  . creates hierachical name space,
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  . now uses normal mixfix annotations (instead of cinfix...),
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  . minor changes to some names and values (for consistency),
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  . e.g. cases -> casedist, dists_eq -> dist_eqs, [take_lemma] -> take_lemmas,
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  . separator between mutual domain defs: changed "," to "and",
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  . improved handling of sort constraints;  now they have to
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    appear on the left-hand side of the equations only;
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* fixed LAM <x,y,zs>.b syntax;
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* added extended adm_tac to simplifier in HOLCF -- can now discharge
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adm (%x. P (t x)), where P is chainfinite and t continuous;
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*** FOL and ZF ***
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* FOL: there is a new splitter `split_asm_tac' that can be used e.g. 
4189
b8c7a6bc6c16 added split_prem_tac
oheimb
parents: 4178
diff changeset
   352
  with `addloop' of the simplifier to faciliate case splitting in premises.
b8c7a6bc6c16 added split_prem_tac
oheimb
parents: 4178
diff changeset
   353
3744
wenzelm
parents: 3719
diff changeset
   354
* qed_spec_mp, qed_goal_spec_mp, qed_goalw_spec_mp are available, as
wenzelm
parents: 3719
diff changeset
   355
in HOL, they strip ALL and --> from proved theorems;
wenzelm
parents: 3719
diff changeset
   356
3719
6a142dab2a08 Safe_tac; qed_spec_mp in FOL
paulson
parents: 3715
diff changeset
   357
3579
8bd9b4b3b61d *** empty log message ***
wenzelm
parents: 3570
diff changeset
   358
3006
wenzelm
parents: 3002
diff changeset
   359
New in Isabelle94-8 (May 1997)
wenzelm
parents: 3002
diff changeset
   360
------------------------------
2654
6efa602921d1 *** empty log message ***
wenzelm
parents: 2653
diff changeset
   361
3002
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   362
*** General Changes ***
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   363
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   364
* new utilities to build / run / maintain Isabelle etc. (in parts
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   365
still somewhat experimental); old Makefiles etc. still functional;
2971
c1e1e8406fb2 *** empty log message ***
wenzelm
parents: 2927
diff changeset
   366
3205
816a1f9fd620 *** empty log message ***
wenzelm
parents: 3116
diff changeset
   367
* new 'Isabelle System Manual';
816a1f9fd620 *** empty log message ***
wenzelm
parents: 3116
diff changeset
   368
2825
a94dba60d5f2 *** empty log message ***
wenzelm
parents: 2773
diff changeset
   369
* INSTALL text, together with ./configure and ./build scripts;
2773
36fdd908a26c *** empty log message ***
wenzelm
parents: 2756
diff changeset
   370
3006
wenzelm
parents: 3002
diff changeset
   371
* reimplemented type inference for greater efficiency, better error
wenzelm
parents: 3002
diff changeset
   372
messages and clean internal interface;
3002
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   373
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   374
* prlim command for dealing with lots of subgoals (an easier way of
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   375
setting goals_limit);
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   376
3006
wenzelm
parents: 3002
diff changeset
   377
wenzelm
parents: 3002
diff changeset
   378
*** Syntax ***
3002
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   379
3116
b890bae4273e *** empty log message ***
wenzelm
parents: 3107
diff changeset
   380
* supports alternative (named) syntax tables (parser and pretty
b890bae4273e *** empty log message ***
wenzelm
parents: 3107
diff changeset
   381
printer); internal interface is provided by add_modesyntax(_i);
b890bae4273e *** empty log message ***
wenzelm
parents: 3107
diff changeset
   382
3002
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   383
* Pure, FOL, ZF, HOL, HOLCF now support symbolic input and output; to
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   384
be used in conjunction with the Isabelle symbol font; uses the
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   385
"symbols" syntax table;
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   386
2705
d6e83a02061d *** empty log message ***
wenzelm
parents: 2654
diff changeset
   387
* added token_translation interface (may translate name tokens in
2756
643cba384a61 *** empty log message ***
wenzelm
parents: 2747
diff changeset
   388
arbitrary ways, dependent on their type (free, bound, tfree, ...) and
3116
b890bae4273e *** empty log message ***
wenzelm
parents: 3107
diff changeset
   389
the current print_mode); IMPORTANT: user print translation functions
b890bae4273e *** empty log message ***
wenzelm
parents: 3107
diff changeset
   390
are responsible for marking newly introduced bounds
b890bae4273e *** empty log message ***
wenzelm
parents: 3107
diff changeset
   391
(Syntax.mark_boundT);
2705
d6e83a02061d *** empty log message ***
wenzelm
parents: 2654
diff changeset
   392
2730
865995b744f5 *** empty log message ***
wenzelm
parents: 2726
diff changeset
   393
* token translations for modes "xterm" and "xterm_color" that display
3006
wenzelm
parents: 3002
diff changeset
   394
names in bold, underline etc. or colors (which requires a color
wenzelm
parents: 3002
diff changeset
   395
version of xterm);
2730
865995b744f5 *** empty log message ***
wenzelm
parents: 2726
diff changeset
   396
3002
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   397
* infixes may now be declared with names independent of their syntax;
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   398
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   399
* added typed_print_translation (like print_translation, but may
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   400
access type of constant);
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   401
3006
wenzelm
parents: 3002
diff changeset
   402
3002
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   403
*** Classical Reasoner ***
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   404
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   405
Blast_tac: a new tactic!  It is often more powerful than fast_tac, but has
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   406
some limitations.  Blast_tac...
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   407
  + ignores addss, addbefore, addafter; this restriction is intrinsic
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   408
  + ignores elimination rules that don't have the correct format
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   409
	(the conclusion MUST be a formula variable)
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   410
  + ignores types, which can make HOL proofs fail
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   411
  + rules must not require higher-order unification, e.g. apply_type in ZF
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   412
    [message "Function Var's argument not a bound variable" relates to this]
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   413
  + its proof strategy is more general but can actually be slower
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   414
3107
wenzelm
parents: 3042
diff changeset
   415
* substitution with equality assumptions no longer permutes other
wenzelm
parents: 3042
diff changeset
   416
assumptions;
3002
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   417
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   418
* minor changes in semantics of addafter (now called addaltern); renamed
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   419
setwrapper to setWrapper and compwrapper to compWrapper; added safe wrapper
3107
wenzelm
parents: 3042
diff changeset
   420
(and access functions for it);
3002
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   421
3317
2cfb98c49c42 adapted entry for addss, addSss
oheimb
parents: 3316
diff changeset
   422
* improved combination of classical reasoner and simplifier: 
2cfb98c49c42 adapted entry for addss, addSss
oheimb
parents: 3316
diff changeset
   423
  + functions for handling clasimpsets
2cfb98c49c42 adapted entry for addss, addSss
oheimb
parents: 3316
diff changeset
   424
  + improvement of addss: now the simplifier is called _after_ the
2cfb98c49c42 adapted entry for addss, addSss
oheimb
parents: 3316
diff changeset
   425
    safe steps.
2cfb98c49c42 adapted entry for addss, addSss
oheimb
parents: 3316
diff changeset
   426
  + safe variant of addss called addSss: uses safe simplifications
2cfb98c49c42 adapted entry for addss, addSss
oheimb
parents: 3316
diff changeset
   427
    _during_ the safe steps. It is more complete as it allows multiple 
2cfb98c49c42 adapted entry for addss, addSss
oheimb
parents: 3316
diff changeset
   428
    instantiations of unknowns (e.g. with slow_tac).
3006
wenzelm
parents: 3002
diff changeset
   429
3002
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   430
*** Simplifier ***
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   431
3006
wenzelm
parents: 3002
diff changeset
   432
* added interface for simplification procedures (functions that
wenzelm
parents: 3002
diff changeset
   433
produce *proven* rewrite rules on the fly, depending on current
wenzelm
parents: 3002
diff changeset
   434
redex);
wenzelm
parents: 3002
diff changeset
   435
wenzelm
parents: 3002
diff changeset
   436
* ordering on terms as parameter (used for ordered rewriting);
wenzelm
parents: 3002
diff changeset
   437
3107
wenzelm
parents: 3042
diff changeset
   438
* new functions delcongs, deleqcongs, and Delcongs. richer rep_ss;
3002
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   439
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   440
* the solver is now split into a safe and an unsafe part.
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   441
This should be invisible for the normal user, except that the
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   442
functions setsolver and addsolver have been renamed to setSolver and
3107
wenzelm
parents: 3042
diff changeset
   443
addSolver; added safe_asm_full_simp_tac;
3002
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   444
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   445
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   446
*** HOL ***
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   447
3042
21cd332b65d3 induct_tac
nipkow
parents: 3006
diff changeset
   448
* a generic induction tactic `induct_tac' which works for all datatypes and
3107
wenzelm
parents: 3042
diff changeset
   449
also for type `nat';
3042
21cd332b65d3 induct_tac
nipkow
parents: 3006
diff changeset
   450
3316
nipkow
parents: 3227
diff changeset
   451
* a generic case distinction tactic `exhaust_tac' which works for all
nipkow
parents: 3227
diff changeset
   452
datatypes and also for type `nat';
nipkow
parents: 3227
diff changeset
   453
nipkow
parents: 3227
diff changeset
   454
* each datatype comes with a function `size';
nipkow
parents: 3227
diff changeset
   455
3002
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   456
* patterns in case expressions allow tuple patterns as arguments to
3107
wenzelm
parents: 3042
diff changeset
   457
constructors, for example `case x of [] => ... | (x,y,z)#ps => ...';
3002
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   458
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   459
* primrec now also works with type nat;
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   460
3338
b99d750f6a37 Added recdef
paulson
parents: 3321
diff changeset
   461
* recdef: a new declaration form, allows general recursive functions to be
b99d750f6a37 Added recdef
paulson
parents: 3321
diff changeset
   462
defined in theory files.  See HOL/ex/Fib, HOL/ex/Primes, HOL/Subst/Unify.
b99d750f6a37 Added recdef
paulson
parents: 3321
diff changeset
   463
3002
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   464
* the constant for negation has been renamed from "not" to "Not" to
3107
wenzelm
parents: 3042
diff changeset
   465
harmonize with FOL, ZF, LK, etc.;
3002
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   466
3107
wenzelm
parents: 3042
diff changeset
   467
* HOL/ex/LFilter theory of a corecursive "filter" functional for
wenzelm
parents: 3042
diff changeset
   468
infinite lists;
3002
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   469
3227
9190438471ea *** empty log message ***
wenzelm
parents: 3205
diff changeset
   470
* HOL/Modelcheck demonstrates invocation of model checker oracle;
9190438471ea *** empty log message ***
wenzelm
parents: 3205
diff changeset
   471
3002
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   472
* HOL/ex/Ring.thy declares cring_simp, which solves equational
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   473
problems in commutative rings, using axiomatic type classes for + and *;
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   474
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   475
* more examples in HOL/MiniML and HOL/Auth;
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   476
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   477
* more default rewrite rules for quantifiers, union/intersection;
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   478
3321
c609a0119fd8 arbitrary
nipkow
parents: 3317
diff changeset
   479
* a new constant `arbitrary == @x.False';
c609a0119fd8 arbitrary
nipkow
parents: 3317
diff changeset
   480
3107
wenzelm
parents: 3042
diff changeset
   481
* HOLCF/IOA replaces old HOL/IOA;
wenzelm
parents: 3042
diff changeset
   482
2653
f1a6997cdc06 described changes for HOLCF-Version without rules and arities
slotosch
parents: 2649
diff changeset
   483
* HOLCF changes: derived all rules and arities 
f1a6997cdc06 described changes for HOLCF-Version without rules and arities
slotosch
parents: 2649
diff changeset
   484
  + axiomatic type classes instead of classes 
f1a6997cdc06 described changes for HOLCF-Version without rules and arities
slotosch
parents: 2649
diff changeset
   485
  + typedef instead of faking type definitions
2747
9fdc1461085f Tidied and updated
paulson
parents: 2732
diff changeset
   486
  + eliminated the internal constants less_fun, less_cfun, UU_fun, UU_cfun etc.
2730
865995b744f5 *** empty log message ***
wenzelm
parents: 2726
diff changeset
   487
  + new axclasses cpo, chfin, flat with flat < chfin < pcpo < cpo < po
2653
f1a6997cdc06 described changes for HOLCF-Version without rules and arities
slotosch
parents: 2649
diff changeset
   488
  + eliminated the types void, one, tr
f1a6997cdc06 described changes for HOLCF-Version without rules and arities
slotosch
parents: 2649
diff changeset
   489
  + use unit lift and bool lift (with translations) instead of one and tr
f1a6997cdc06 described changes for HOLCF-Version without rules and arities
slotosch
parents: 2649
diff changeset
   490
  + eliminated blift from Lift3.thy (use Def instead of blift)
3107
wenzelm
parents: 3042
diff changeset
   491
  all eliminated rules are derived as theorems --> no visible changes ;
2649
2edc5b01e5a7 improved description of recent changes
oheimb
parents: 2639
diff changeset
   492
3006
wenzelm
parents: 3002
diff changeset
   493
3002
223e5d65faaa Reorganized under headings. Also documented Blast_tac and LFilter
paulson
parents: 2993
diff changeset
   494
*** ZF ***
2553
ed941505cab7 Isabelle NEWS -- history of user-visible changes;
wenzelm
parents:
diff changeset
   495
2865
77daca16b2f4 ZF.thy is again usable
paulson
parents: 2825
diff changeset
   496
* ZF now has Fast_tac, Simp_tac and Auto_tac.  Union_iff is a now a default
77daca16b2f4 ZF.thy is again usable
paulson
parents: 2825
diff changeset
   497
rewrite rule; this may affect some proofs.  eq_cs is gone but can be put back
77daca16b2f4 ZF.thy is again usable
paulson
parents: 2825
diff changeset
   498
as ZF_cs addSIs [equalityI];
2553
ed941505cab7 Isabelle NEWS -- history of user-visible changes;
wenzelm
parents:
diff changeset
   499
2554
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   500
2732
84fc9c3b6bf0 *** empty log message ***
wenzelm
parents: 2731
diff changeset
   501
2553
ed941505cab7 Isabelle NEWS -- history of user-visible changes;
wenzelm
parents:
diff changeset
   502
New in Isabelle94-7 (November 96)
ed941505cab7 Isabelle NEWS -- history of user-visible changes;
wenzelm
parents:
diff changeset
   503
---------------------------------
ed941505cab7 Isabelle NEWS -- history of user-visible changes;
wenzelm
parents:
diff changeset
   504
ed941505cab7 Isabelle NEWS -- history of user-visible changes;
wenzelm
parents:
diff changeset
   505
* allowing negative levels (as offsets) in prlev and choplev;
ed941505cab7 Isabelle NEWS -- history of user-visible changes;
wenzelm
parents:
diff changeset
   506
2554
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   507
* super-linear speedup for large simplifications;
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   508
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   509
* FOL, ZF and HOL now use miniscoping: rewriting pushes
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   510
quantifications in as far as possible (COULD MAKE EXISTING PROOFS
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   511
FAIL); can suppress it using the command Delsimps (ex_simps @
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   512
all_simps); De Morgan laws are also now included, by default;
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   513
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   514
* improved printing of ==>  :  ~:
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   515
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   516
* new object-logic "Sequents" adds linear logic, while replacing LK
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   517
and Modal (thanks to Sara Kalvala);
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   518
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   519
* HOL/Auth: correctness proofs for authentication protocols;
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   520
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   521
* HOL: new auto_tac combines rewriting and classical reasoning (many
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   522
examples on HOL/Auth);
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   523
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   524
* HOL: new command AddIffs for declaring theorems of the form P=Q to
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   525
the rewriter and classical reasoner simultaneously;
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   526
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wenzelm
parents: 2553
diff changeset
   527
* function uresult no longer returns theorems in "standard" format;
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   528
regain previous version by: val uresult = standard o uresult;
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   529
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wenzelm
parents: 2553
diff changeset
   530
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wenzelm
parents: 2553
diff changeset
   531
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parents: 2553
diff changeset
   532
New in Isabelle94-6
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wenzelm
parents: 2553
diff changeset
   533
-------------------
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   534
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wenzelm
parents: 2553
diff changeset
   535
* oracles -- these establish an interface between Isabelle and trusted
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   536
external reasoners, which may deliver results as theorems;
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   537
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wenzelm
parents: 2553
diff changeset
   538
* proof objects (in particular record all uses of oracles);
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   539
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wenzelm
parents: 2553
diff changeset
   540
* Simp_tac, Fast_tac, etc. that refer to implicit simpset / claset;
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   541
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wenzelm
parents: 2553
diff changeset
   542
* "constdefs" section in theory files;
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   543
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wenzelm
parents: 2553
diff changeset
   544
* "primrec" section (HOL) no longer requires names;
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wenzelm
parents: 2553
diff changeset
   545
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wenzelm
parents: 2553
diff changeset
   546
* internal type "tactic" now simply "thm -> thm Sequence.seq";
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wenzelm
parents: 2553
diff changeset
   547
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wenzelm
parents: 2553
diff changeset
   548
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wenzelm
parents: 2553
diff changeset
   549
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wenzelm
parents: 2553
diff changeset
   550
New in Isabelle94-5
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wenzelm
parents: 2553
diff changeset
   551
-------------------
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wenzelm
parents: 2553
diff changeset
   552
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wenzelm
parents: 2553
diff changeset
   553
* reduced space requirements;
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   554
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wenzelm
parents: 2553
diff changeset
   555
* automatic HTML generation from theories;
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   556
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   557
* theory files no longer require "..." (quotes) around most types;
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wenzelm
parents: 2553
diff changeset
   558
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wenzelm
parents: 2553
diff changeset
   559
* new examples, including two proofs of the Church-Rosser theorem;
1b160cd50130 *** empty log message ***
wenzelm
parents: 2553
diff changeset
   560
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wenzelm
parents: 2553
diff changeset
   561
* non-curried (1994) version of HOL is no longer distributed;
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wenzelm
parents: 2553
diff changeset
   562
2553
ed941505cab7 Isabelle NEWS -- history of user-visible changes;
wenzelm
parents:
diff changeset
   563
2557
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   564
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   565
New in Isabelle94-4
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   566
-------------------
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   567
2747
9fdc1461085f Tidied and updated
paulson
parents: 2732
diff changeset
   568
* greatly reduced space requirements;
2557
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   569
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   570
* theory files (.thy) no longer require \...\ escapes at line breaks;
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   571
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   572
* searchable theorem database (see the section "Retrieving theorems" on 
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   573
page 8 of the Reference Manual);
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   574
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   575
* new examples, including Grabczewski's monumental case study of the
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   576
Axiom of Choice;
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   577
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   578
* The previous version of HOL renamed to Old_HOL;
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   579
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   580
* The new version of HOL (previously called CHOL) uses a curried syntax 
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   581
for functions.  Application looks like f a b instead of f(a,b);
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   582
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   583
* Mutually recursive inductive definitions finally work in HOL;
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   584
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   585
* In ZF, pattern-matching on tuples is now available in all abstractions and
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   586
translates to the operator "split";
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   587
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   588
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   589
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   590
New in Isabelle94-3
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   591
-------------------
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   592
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   593
* new infix operator, addss, allowing the classical reasoner to 
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   594
perform simplification at each step of its search.  Example:
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   595
	fast_tac (cs addss ss)
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   596
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   597
* a new logic, CHOL, the same as HOL, but with a curried syntax 
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   598
for functions.  Application looks like f a b instead of f(a,b).  Also pairs 
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   599
look like (a,b) instead of <a,b>;
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   600
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   601
* PLEASE NOTE: CHOL will eventually replace HOL!
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   602
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   603
* In CHOL, pattern-matching on tuples is now available in all abstractions.
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   604
It translates to the operator "split".  A new theory of integers is available;
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   605
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   606
* In ZF, integer numerals now denote two's-complement binary integers.
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   607
Arithmetic operations can be performed by rewriting.  See ZF/ex/Bin.ML;
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   608
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   609
* Many new examples: I/O automata, Church-Rosser theorem, equivalents 
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   610
of the Axiom of Choice;
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   611
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   612
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   613
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   614
New in Isabelle94-2
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   615
-------------------
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   616
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   617
* Significantly faster resolution;  
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   618
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   619
* the different sections in a .thy file can now be mixed and repeated
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   620
freely;
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   621
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   622
* Database of theorems for FOL, HOL and ZF.  New
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   623
commands including qed, qed_goal and bind_thm store theorems in the database.
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   624
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   625
* Simple database queries: return a named theorem (get_thm) or all theorems of
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   626
a given theory (thms_of), or find out what theory a theorem was proved in
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   627
(theory_of_thm);
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   628
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   629
* Bugs fixed in the inductive definition and datatype packages;
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   630
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   631
* The classical reasoner provides deepen_tac and depth_tac, making FOL_dup_cs
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   632
and HOL_dup_cs obsolete;
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   633
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   634
* Syntactic ambiguities caused by the new treatment of syntax in Isabelle94-1
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   635
have been removed;
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   636
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   637
* Simpler definition of function space in ZF;
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   638
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   639
* new results about cardinal and ordinal arithmetic in ZF;
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   640
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   641
* 'subtype' facility in HOL for introducing new types as subsets of existing
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   642
types;
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   643
dffebc6ab0a1 More news items, dating back to 1995
paulson
parents: 2556
diff changeset
   644
2553
ed941505cab7 Isabelle NEWS -- history of user-visible changes;
wenzelm
parents:
diff changeset
   645
$Id$