NEWS
author wenzelm
Wed Mar 10 16:31:33 1999 +0100 (1999-03-10)
changeset 6343 97c697a32b73
parent 6278 37b76155a49e
child 6386 e9e8af97f48f
permissions -rw-r--r--
updated;
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Isabelle NEWS -- history user-relevant changes
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==============================================
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New in this Isabelle version
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----------------------------
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*** Overview of INCOMPATIBILITIES (see below for more details) ***
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* HOL: Removed the obsolete syntax "Compl A"; use -A for set
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complement;
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* HOL: the predicate "inj" is now defined by translation to "inj_on";
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* ZF: The con_defs part of an inductive definition may no longer refer
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to constants declared in the same theory;
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* HOL, ZF: the function mk_cases, generated by the inductive
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definition package, has lost an argument.  To simplify its result, it
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uses the default simpset instead of a supplied list of theorems.
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*** Proof tools ***
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* Provers/Arith/fast_lin_arith.ML contains a functor for creating a
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decision procedure for linear arithmetic. Currently it is used for
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types `nat' and `int' in HOL (see below) but can, should and will be
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instantiated for other types and logics as well.
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*** General ***
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* in locales, the "assumes" and "defines" parts may be omitted if
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empty;
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* new print_mode "xsymbols" for extended symbol support (e.g. genuine
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long arrows);
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* new print_mode "HTML";
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* path element specification '~~' refers to '$ISABELLE_HOME';
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* new flag show_tags controls display of tags of theorems (which are
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basically just comments that may be attached by some tools);
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*** HOL ***
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* There are now decision procedures for linear arithmetic over nat and
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int:
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1. arith_tac copes with arbitrary formulae involving `=', `<', `<=',
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`+', `-', `Suc', `min', `max' and numerical constants; other subterms
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are treated as atomic; subformulae not involving type `nat' or `int'
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are ignored; quantified subformulae are ignored unless they are
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positive universal or negative existential. The tactic has to be
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invoked by hand and can be a little bit slow. In particular, the
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running time is exponential in the number of occurrences of `min' and
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`max', and `-' on `nat'.
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2. fast_arith_tac is a cut-down version of arith_tac: it only takes
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(negated) (in)equalities among the premises and the conclusion into
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account (i.e. no compound formulae) and does not know about `min' and
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`max', and `-' on `nat'. It is fast and is used automatically by the
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simplifier.
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NB: At the moment, these decision procedures do not cope with mixed
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nat/int formulae where the two parts interact, such as `m < n ==>
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int(m) < int(n)'.
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* HOL/TLA (Lamport's Temporal Logic of Actions): major reorganization
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-- avoids syntactic ambiguities and treats state, transition, and
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temporal levels more uniformly; introduces INCOMPATIBILITIES due to
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changed syntax and (many) tactics;
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*** ZF ***
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* new primrec section allows primitive recursive functions to be given
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directly (as in HOL) over datatypes and the natural numbers;
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* new tactics induct_tac and exhaust_tac for induction (or case
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analysis) over datatypes and the natural numbers;
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* the datatype declaration of type T now defines the recursor T_rec;
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* simplification automatically does freeness reasoning for datatype
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constructors;
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* automatic type-inference, with AddTCs command to insert new
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type-checking rules;
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* datatype introduction rules are now added as Safe Introduction rules
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to the claset;
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* the syntax "if P then x else y" is now available in addition to
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if(P,x,y);
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*** Internal programming interfaces ***
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* tuned current_goals_markers semantics: begin / end goal avoids
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printing empty lines;
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* removed prs and prs_fn hook, which was broken because it did not
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include \n in its semantics, forcing writeln to add one
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uncoditionally; replaced prs_fn by writeln_fn; consider std_output:
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string -> unit if you really want to output text without newline;
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* Symbol.output subject to print mode; INCOMPATIBILITY: defaults to
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plain output, interface builders may have to enable 'isabelle_font'
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mode to get Isabelle font glyphs as before;
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* refined token_translation interface; INCOMPATIBILITY: output length
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now of type real instead of int;
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New in Isabelle98-1 (October 1998)
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----------------------------------
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*** Overview of INCOMPATIBILITIES (see below for more details) ***
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* several changes of automated proof tools;
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* HOL: major changes to the inductive and datatype packages, including
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some minor incompatibilities of theory syntax;
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* HOL: renamed r^-1 to 'converse' from 'inverse'; 'inj_onto' is now
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called `inj_on';
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* HOL: removed duplicate thms in Arith:
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  less_imp_add_less  should be replaced by  trans_less_add1
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  le_imp_add_le      should be replaced by  trans_le_add1
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* HOL: unary minus is now overloaded (new type constraints may be
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required);
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* HOL and ZF: unary minus for integers is now #- instead of #~.  In
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ZF, expressions such as n#-1 must be changed to n#- 1, since #-1 is
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now taken as an integer constant.
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* Pure: ML function 'theory_of' renamed to 'theory';
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*** Proof tools ***
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* Simplifier:
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  1. 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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  2. The simplifier now knows a little bit about nat-arithmetic.
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* Classical reasoner: wrapper mechanism for the classical reasoner now
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allows for selected deletion of wrappers, by introduction of names for
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wrapper functionals.  This implies that addbefore, addSbefore,
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addaltern, and addSaltern now take a pair (name, tactic) as argument,
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and that adding two tactics with the same name overwrites the first
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one (emitting a 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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* Classical reasoner: addbefore/addSbefore now have APPEND/ORELSE
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semantics; addbefore now affects only the unsafe part of step_tac
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etc.; this affects addss/auto_tac/force_tac, so EXISTING PROOFS MAY
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FAIL, but proofs should be fixable easily, e.g. by replacing Auto_tac
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by Force_tac;
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* Classical reasoner: setwrapper to setWrapper and compwrapper to
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compWrapper; added safe wrapper (and access functions for it);
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* HOL/split_all_tac is now much faster and fails if there is nothing
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to split.  Some EXISTING PROOFS MAY REQUIRE ADAPTION because the order
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and the names of the automatically generated variables have changed.
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split_all_tac has moved within claset() from unsafe wrappers to safe
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wrappers, which means that !!-bound variables are split much more
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aggressively, and safe_tac and clarify_tac now split such variables.
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If this splitting is not appropriate, use delSWrapper "split_all_tac".
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Note: the same holds for record_split_tac, which does the job of
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split_all_tac for record fields.
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* HOL/Simplifier: Rewrite rules for case distinctions can now be added
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permanently to the default simpset using Addsplits just like
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Addsimps. They can be removed via Delsplits just like
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Delsimps. Lower-case versions are also available.
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* HOL/Simplifier: The rule split_if is now part of the default
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simpset. This means that the simplifier will eliminate all occurrences
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of if-then-else in the conclusion of a goal. To prevent this, you can
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either remove split_if completely from the default simpset by
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`Delsplits [split_if]' or remove it in a specific call of the
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simplifier using `... delsplits [split_if]'.  You can also add/delete
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other case splitting rules to/from the default simpset: every datatype
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generates suitable rules `split_t_case' and `split_t_case_asm' (where
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t is the name of the datatype).
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* Classical reasoner / Simplifier combination: new force_tac (and
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derivatives Force_tac, force) combines rewriting and classical
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reasoning (and whatever other tools) similarly to auto_tac, but is
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aimed to solve the given subgoal completely.
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*** General ***
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* new top-level 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 context is used; assumptions are no longer returned
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at the ML-level unless one of them starts with ==> or !!; it is
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recommended to convert to these new commands using isatool fixgoal
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(backup your sources first!);
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* new top-level commands 'thm' and 'thms' for retrieving theorems from
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the current theory context, and 'theory' to lookup stored theories;
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* new theory section 'locale' for declaring constants, assumptions and
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definitions that have local scope;
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* new theory section 'nonterminals' for purely syntactic types;
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* new theory section 'setup' for generic ML setup functions
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(e.g. package initialization);
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* the distribution now includes Isabelle icons: see
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lib/logo/isabelle-{small,tiny}.xpm;
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* isatool install - install binaries with absolute references to
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ISABELLE_HOME/bin;
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* isatool logo -- create instances of the Isabelle logo (as EPS);
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* print mode 'emacs' reserved for Isamode;
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* support multiple print (ast) translations per constant name;
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*** HOL ***
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* there is now a tutorial on Isabelle/HOL (do 'isatool doc tutorial');
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* HOL/inductive package reorganized and improved: now supports mutual
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definitions such as
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  inductive EVEN ODD
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    intrs
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      null "0 : EVEN"
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      oddI "n : EVEN ==> Suc n : ODD"
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      evenI "n : ODD ==> Suc n : EVEN"
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new theorem list "elims" contains an elimination rule for each of the
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recursive sets; inductive definitions now handle disjunctive premises
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correctly (also ZF);
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INCOMPATIBILITIES: requires Inductive as an ancestor; component
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"mutual_induct" no longer exists - the induction rule is always
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contained in "induct";
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* HOL/datatype package re-implemented and greatly improved: now
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supports mutually recursive datatypes such as
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  datatype
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    'a aexp = IF_THEN_ELSE ('a bexp) ('a aexp) ('a aexp)
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            | SUM ('a aexp) ('a aexp)
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            | DIFF ('a aexp) ('a aexp)
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            | NUM 'a
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  and
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    'a bexp = LESS ('a aexp) ('a aexp)
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            | AND ('a bexp) ('a bexp)
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            | OR ('a bexp) ('a bexp)
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as well as indirectly recursive datatypes such as
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  datatype
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    ('a, 'b) term = Var 'a
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                  | App 'b ((('a, 'b) term) list)
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The new tactic  mutual_induct_tac [<var_1>, ..., <var_n>] i  performs
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induction on mutually / indirectly recursive datatypes.
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Primrec equations are now stored in theory and can be accessed via
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<function_name>.simps.
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INCOMPATIBILITIES:
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  - Theories using datatypes must now have theory Datatype as an
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    ancestor.
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  - The specific <typename>.induct_tac no longer exists - use the
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    generic induct_tac instead.
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  - natE has been renamed to nat.exhaust - use exhaust_tac
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    instead of res_inst_tac ... natE. Note that the variable
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    names in nat.exhaust differ from the names in natE, this
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    may cause some "fragile" proofs to fail.
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  - The theorems split_<typename>_case and split_<typename>_case_asm
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    have been renamed to <typename>.split and <typename>.split_asm.
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  - Since default sorts of type variables are now handled correctly,
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    some datatype definitions may have to be annotated with explicit
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    sort constraints.
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  - Primrec definitions no longer require function name and type
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    of recursive argument.
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Consider using isatool fixdatatype to adapt your theories and proof
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scripts to the new package (backup your sources first!).
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* HOL/record package: considerably improved implementation; now
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includes concrete syntax for record types, terms, updates; theorems
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for surjective pairing and splitting !!-bound record variables; proof
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support is as follows:
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  1) standard conversions (selectors or updates applied to record
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constructor terms) are part of the standard simpset;
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  2) inject equations of the form ((x, y) = (x', y')) == x=x' & y=y' are
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made part of standard simpset and claset via addIffs;
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  3) a tactic for record field splitting (record_split_tac) is part of
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the standard claset (addSWrapper);
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To get a better idea about these rules you may retrieve them via
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something like 'thms "foo.simps"' or 'thms "foo.iffs"', where "foo" is
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the name of your record type.
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The split tactic 3) conceptually simplifies by the following rule:
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  "(!!x. PROP ?P x) == (!!a b. PROP ?P (a, b))"
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Thus any record variable that is bound by meta-all will automatically
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blow up into some record constructor term, consequently the
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simplifications of 1), 2) apply.  Thus force_tac, auto_tac etc. shall
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solve record problems automatically.
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* reorganized the main HOL image: HOL/Integ and String loaded by
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default; theory Main includes everything;
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* automatic simplification of integer sums and comparisons, using cancellation;
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* added option_map_eq_Some and not_Some_eq to the default simpset and claset;
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* added disj_not1 = "(~P | Q) = (P --> Q)" to the default simpset;
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* many new identities for unions, intersections, set difference, etc.;
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* expand_if, expand_split, expand_sum_case and expand_nat_case are now
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called split_if, split_split, split_sum_case and split_nat_case (to go
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with add/delsplits);
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* HOL/Prod introduces simplification procedure unit_eq_proc rewriting
wenzelm@5127
   356
(?x::unit) = (); this is made part of the default simpset, which COULD
wenzelm@5127
   357
MAKE EXISTING PROOFS FAIL under rare circumstances (consider
wenzelm@5207
   358
'Delsimprocs [unit_eq_proc];' as last resort); also note that
wenzelm@5207
   359
unit_abs_eta_conv is added in order to counter the effect of
wenzelm@5207
   360
unit_eq_proc on (%u::unit. f u), replacing it by f rather than by
wenzelm@5207
   361
%u.f();
wenzelm@5125
   362
wenzelm@5217
   363
* HOL/Fun INCOMPATIBILITY: `inj_onto' is now called `inj_on' (which
wenzelm@5217
   364
makes more sense);
berghofe@5109
   365
paulson@5475
   366
* HOL/Set INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
   367
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
   368
  disjointness reasoning but breaking a few old proofs.
paulson@5267
   369
wenzelm@5217
   370
* HOL/Relation INCOMPATIBILITY: renamed the relational operator r^-1
wenzelm@5217
   371
to 'converse' from 'inverse' (for compatibility with ZF and some
wenzelm@5217
   372
literature);
wenzelm@5085
   373
wenzelm@5127
   374
* HOL/recdef can now declare non-recursive functions, with {} supplied as
wenzelm@5127
   375
the well-founded relation;
oheimb@4838
   376
paulson@5490
   377
* HOL/Set INCOMPATIBILITY: the complement of set A is now written -A instead of
paulson@5490
   378
    Compl A.  The "Compl" syntax remains available as input syntax for this
paulson@5490
   379
    release ONLY.
paulson@5490
   380
wenzelm@5127
   381
* HOL/Update: new theory of function updates:
wenzelm@5127
   382
    f(a:=b) == %x. if x=a then b else f x
wenzelm@5127
   383
may also be iterated as in f(a:=b,c:=d,...);
nipkow@5077
   384
wenzelm@5127
   385
* HOL/Vimage: new theory for inverse image of a function, syntax f-``B;
paulson@4899
   386
nipkow@5282
   387
* HOL/List:
nipkow@5282
   388
  - new function list_update written xs[i:=v] that updates the i-th
nipkow@5282
   389
    list position. May also be iterated as in xs[i:=a,j:=b,...].
nipkow@5428
   390
  - new function `upt' written [i..j(] which generates the list
nipkow@5428
   391
    [i,i+1,...,j-1], i.e. the upper bound is excluded. To include the upper
nipkow@5428
   392
    bound write [i..j], which is a shorthand for [i..j+1(].
nipkow@5282
   393
  - new lexicographic orderings and corresponding wellfoundedness theorems.
paulson@4779
   394
wenzelm@5127
   395
* HOL/Arith:
wenzelm@5127
   396
  - removed 'pred' (predecessor) function;
wenzelm@5127
   397
  - generalized some theorems about n-1;
wenzelm@5127
   398
  - many new laws about "div" and "mod";
wenzelm@5127
   399
  - new laws about greatest common divisors (see theory ex/Primes);
oheimb@4766
   400
wenzelm@5127
   401
* HOL/Relation: renamed the relational operator r^-1 "converse"
wenzelm@4842
   402
instead of "inverse";
wenzelm@4711
   403
nipkow@5651
   404
* HOL/Induct/Multiset: a theory of multisets, including the wellfoundedness
nipkow@5651
   405
  of the multiset ordering;
nipkow@5651
   406
wenzelm@5127
   407
* directory HOL/Real: a construction of the reals using Dedekind cuts
nipkow@5651
   408
  (not included by default);
nipkow@4835
   409
wenzelm@5127
   410
* directory HOL/UNITY: Chandy and Misra's UNITY formalism;
wenzelm@4711
   411
nipkow@5651
   412
* directory HOL/Hoare: a new version of Hoare logic which permits many-sorted
nipkow@5651
   413
  programs, i.e. different program variables may have different types.
nipkow@5651
   414
paulson@5142
   415
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
   416
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
   417
  Now rew can involve either definitions or equalities (either == or =).
wenzelm@5002
   418
wenzelm@5363
   419
paulson@4879
   420
*** ZF ***
paulson@4879
   421
paulson@5332
   422
* theory Main includes everything; INCOMPATIBILITY: theory ZF.thy contains
paulson@5332
   423
  only the theorems proved on ZF.ML;
paulson@5160
   424
paulson@5475
   425
* ZF INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
   426
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
   427
  disjointness reasoning but breaking a few old proofs.
paulson@5267
   428
paulson@5160
   429
* ZF/Update: new theory of function updates
paulson@5160
   430
    with default rewrite rule  f(x:=y) ` z = if(z=x, y, f`z)
paulson@5160
   431
  may also be iterated as in f(a:=b,c:=d,...);
paulson@5160
   432
paulson@4879
   433
* in  let x=t in u(x), neither t nor u(x) has to be an FOL term.
oheimb@4649
   434
paulson@5142
   435
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
   436
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
   437
  Now rew can involve either definitions or equalities (either == or =).
paulson@5142
   438
paulson@5160
   439
* case_tac provided for compatibility with HOL
paulson@5160
   440
    (like the old excluded_middle_tac, but with subgoals swapped)
paulson@5160
   441
wenzelm@4842
   442
wenzelm@5127
   443
*** Internal programming interfaces ***
wenzelm@5002
   444
wenzelm@5251
   445
* Pure: several new basic modules made available for general use, see
wenzelm@5251
   446
also src/Pure/README;
wenzelm@5207
   447
wenzelm@5008
   448
* improved the theory data mechanism to support encapsulation (data
wenzelm@5008
   449
kind name replaced by private Object.kind, acting as authorization
wenzelm@5373
   450
key); new type-safe user interface via functor TheoryDataFun; generic
wenzelm@5373
   451
print_data function becomes basically useless;
wenzelm@5002
   452
wenzelm@5251
   453
* removed global_names compatibility flag -- all theory declarations
wenzelm@5251
   454
are qualified by default;
wenzelm@5251
   455
wenzelm@5085
   456
* module Pure/Syntax now offers quote / antiquote translation
wenzelm@5085
   457
functions (useful for Hoare logic etc. with implicit dependencies);
wenzelm@5373
   458
see HOL/ex/Antiquote for an example use;
wenzelm@5085
   459
wenzelm@5127
   460
* Simplifier now offers conversions (asm_)(full_)rewrite: simpset ->
wenzelm@5127
   461
cterm -> thm;
wenzelm@5127
   462
wenzelm@5207
   463
* new tactical CHANGED_GOAL for checking that a tactic modifies a
wenzelm@5207
   464
subgoal;
paulson@5142
   465
wenzelm@5251
   466
* Display.print_goals function moved to Locale.print_goals;
wenzelm@5251
   467
wenzelm@5731
   468
* standard print function for goals supports current_goals_markers
wenzelm@5731
   469
variable for marking begin of proof, end of proof, start of goal; the
wenzelm@5731
   470
default is ("", "", ""); setting current_goals_markers := ("<proof>",
wenzelm@5731
   471
"</proof>", "<goal>") causes SGML like tagged proof state printing,
wenzelm@5731
   472
for example;
wenzelm@5731
   473
wenzelm@5002
   474
wenzelm@5002
   475
wenzelm@4410
   476
New in Isabelle98 (January 1998)
wenzelm@4410
   477
--------------------------------
wenzelm@4410
   478
wenzelm@4410
   479
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4410
   480
wenzelm@4410
   481
* changed lexical syntax of terms / types: dots made part of long
wenzelm@4410
   482
identifiers, e.g. "%x.x" no longer possible, should be "%x. x";
wenzelm@4410
   483
wenzelm@4410
   484
* simpset (and claset) reference variable replaced by functions
wenzelm@4410
   485
simpset / simpset_ref;
wenzelm@4410
   486
wenzelm@4410
   487
* no longer supports theory aliases (via merge) and non-trivial
wenzelm@4410
   488
implicit merge of thms' signatures;
wenzelm@4410
   489
wenzelm@4410
   490
* most internal names of constants changed due to qualified names;
wenzelm@4410
   491
wenzelm@4410
   492
* changed Pure/Sequence interface (see Pure/seq.ML);
wenzelm@4410
   493
wenzelm@3454
   494
paulson@3715
   495
*** General Changes ***
paulson@3715
   496
wenzelm@4174
   497
* hierachically structured name spaces (for consts, types, axms, thms
wenzelm@3943
   498
etc.); new lexical class 'longid' (e.g. Foo.bar.x) may render much of
wenzelm@4108
   499
old input syntactically incorrect (e.g. "%x.x"); COMPATIBILITY:
wenzelm@4108
   500
isatool fixdots ensures space after dots (e.g. "%x. x"); set
wenzelm@4174
   501
long_names for fully qualified output names; NOTE: ML programs
wenzelm@4174
   502
(special tactics, packages etc.) referring to internal names may have
wenzelm@4174
   503
to be adapted to cope with fully qualified names; in case of severe
wenzelm@4174
   504
backward campatibility problems try setting 'global_names' at compile
wenzelm@4174
   505
time to have enrything declared within a flat name space; one may also
wenzelm@4174
   506
fine tune name declarations in theories via the 'global' and 'local'
wenzelm@4174
   507
section;
wenzelm@4108
   508
wenzelm@4108
   509
* reimplemented the implicit simpset and claset using the new anytype
wenzelm@4108
   510
data filed in signatures; references simpset:simpset ref etc. are
wenzelm@4108
   511
replaced by functions simpset:unit->simpset and
wenzelm@4108
   512
simpset_ref:unit->simpset ref; COMPATIBILITY: use isatool fixclasimp
wenzelm@4108
   513
to patch your ML files accordingly;
paulson@3856
   514
wenzelm@3857
   515
* HTML output now includes theory graph data for display with Java
wenzelm@3857
   516
applet or isatool browser; data generated automatically via isatool
wenzelm@3901
   517
usedir (see -i option, ISABELLE_USEDIR_OPTIONS);
wenzelm@3857
   518
paulson@3856
   519
* defs may now be conditional; improved rewrite_goals_tac to handle
paulson@3856
   520
conditional equations;
paulson@3856
   521
wenzelm@4174
   522
* defs now admits additional type arguments, using TYPE('a) syntax;
wenzelm@4174
   523
wenzelm@3901
   524
* theory aliases via merge (e.g. M=A+B+C) no longer supported, always
wenzelm@3901
   525
creates a new theory node; implicit merge of thms' signatures is
wenzelm@4112
   526
restricted to 'trivial' ones; COMPATIBILITY: one may have to use
wenzelm@3901
   527
transfer:theory->thm->thm in (rare) cases;
wenzelm@3901
   528
wenzelm@3968
   529
* improved handling of draft signatures / theories; draft thms (and
wenzelm@3968
   530
ctyps, cterms) are automatically promoted to real ones;
wenzelm@3968
   531
wenzelm@3901
   532
* slightly changed interfaces for oracles: admit many per theory, named
wenzelm@3901
   533
(e.g. oracle foo = mlfun), additional name argument for invoke_oracle;
wenzelm@3901
   534
wenzelm@3901
   535
* print_goals: optional output of const types (set show_consts and
wenzelm@3901
   536
show_types);
wenzelm@3851
   537
wenzelm@4388
   538
* improved output of warnings (###) and errors (***);
wenzelm@3697
   539
paulson@4178
   540
* subgoal_tac displays a warning if the new subgoal has type variables;
paulson@4178
   541
paulson@3715
   542
* removed old README and Makefiles;
wenzelm@3697
   543
paulson@3856
   544
* replaced print_goals_ref hook by print_current_goals_fn and result_error_fn;
wenzelm@3670
   545
paulson@3715
   546
* removed obsolete init_pps and init_database;
paulson@3715
   547
paulson@3715
   548
* deleted the obsolete tactical STATE, which was declared by
paulson@3715
   549
    fun STATE tacfun st = tacfun st st;
paulson@3715
   550
wenzelm@4388
   551
* cd and use now support path variables, e.g. $ISABELLE_HOME, or ~
wenzelm@4388
   552
(which abbreviates $HOME);
wenzelm@4269
   553
wenzelm@4269
   554
* changed Pure/Sequence interface (see Pure/seq.ML); COMPATIBILITY:
wenzelm@4269
   555
use isatool fixseq to adapt your ML programs (this works for fully
wenzelm@4269
   556
qualified references to the Sequence structure only!);
wenzelm@4269
   557
wenzelm@4381
   558
* use_thy no longer requires writable current directory; it always
wenzelm@4381
   559
reloads .ML *and* .thy file, if either one is out of date;
wenzelm@4269
   560
paulson@3715
   561
paulson@3715
   562
*** Classical Reasoner ***
paulson@3715
   563
wenzelm@3744
   564
* Clarify_tac, clarify_tac, clarify_step_tac, Clarify_step_tac: new
wenzelm@3744
   565
tactics that use classical reasoning to simplify a subgoal without
wenzelm@3744
   566
splitting it into several subgoals;
paulson@3715
   567
paulson@3719
   568
* Safe_tac: like safe_tac but uses the default claset;
paulson@3719
   569
paulson@3715
   570
paulson@3715
   571
*** Simplifier ***
paulson@3715
   572
paulson@3715
   573
* added simplification meta rules:
paulson@3715
   574
    (asm_)(full_)simplify: simpset -> thm -> thm;
paulson@3715
   575
paulson@3715
   576
* simplifier.ML no longer part of Pure -- has to be loaded by object
paulson@3715
   577
logics (again);
paulson@3715
   578
paulson@3715
   579
* added prems argument to simplification procedures;
paulson@3715
   580
paulson@4325
   581
* HOL, FOL, ZF: added infix function `addsplits':
paulson@4325
   582
  instead of `<simpset> setloop (split_tac <thms>)'
paulson@4325
   583
  you can simply write `<simpset> addsplits <thms>'
paulson@4325
   584
paulson@3715
   585
paulson@3715
   586
*** Syntax ***
paulson@3715
   587
wenzelm@4174
   588
* TYPE('a) syntax for type reflection terms;
wenzelm@4174
   589
wenzelm@3985
   590
* no longer handles consts with name "" -- declare as 'syntax' instead;
paulson@3856
   591
paulson@3856
   592
* pretty printer: changed order of mixfix annotation preference (again!);
wenzelm@3846
   593
paulson@3715
   594
* Pure: fixed idt/idts vs. pttrn/pttrns syntactic categories;
paulson@3715
   595
paulson@3715
   596
paulson@3715
   597
*** HOL ***
paulson@3715
   598
wenzelm@5726
   599
* HOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
   600
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
   601
nipkow@4035
   602
* HOL/TLA: Stephan Merz's formalization of Lamport's Temporal Logic of Actions;
wenzelm@3985
   603
wenzelm@3985
   604
* HOL/Auth: new protocol proofs including some for the Internet
nipkow@4035
   605
  protocol TLS;
wenzelm@3985
   606
wenzelm@4125
   607
* HOL/Map: new theory of `maps' a la VDM;
nipkow@3982
   608
wenzelm@4335
   609
* HOL/simplifier: simplification procedures nat_cancel_sums for
wenzelm@4335
   610
cancelling out common nat summands from =, <, <= (in)equalities, or
wenzelm@4335
   611
differences; simplification procedures nat_cancel_factor for
wenzelm@4335
   612
cancelling common factor from =, <, <= (in)equalities over natural
wenzelm@4373
   613
sums; nat_cancel contains both kinds of procedures, it is installed by
wenzelm@4373
   614
default in Arith.thy -- this COULD MAKE EXISTING PROOFS FAIL;
wenzelm@4335
   615
nipkow@3580
   616
* HOL/simplifier: terms of the form
paulson@4325
   617
  `? x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x)'  (or t=x)
nipkow@3580
   618
  are rewritten to
nipkow@4035
   619
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t)',
nipkow@4035
   620
  and those of the form
paulson@4325
   621
  `! x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x) --> R(x)'  (or t=x)
nipkow@4035
   622
  are rewritten to
nipkow@4035
   623
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t) --> R(t)',
nipkow@4035
   624
nipkow@4035
   625
* HOL/datatype
nipkow@4035
   626
  Each datatype `t' now comes with a theorem `split_t_case' of the form
nipkow@3580
   627
nipkow@4035
   628
  P(t_case f1 ... fn x) =
nipkow@4035
   629
     ( (!y1 ... ym1. x = C1 y1 ... ym1 --> P(f1 y1 ... ym1)) &
nipkow@4035
   630
        ...
oheimb@4189
   631
       (!y1 ... ymn. x = Cn y1 ... ymn --> P(f1 y1 ... ymn))
nipkow@4035
   632
     )
nipkow@4035
   633
oheimb@4930
   634
  and a theorem `split_t_case_asm' of the form
oheimb@4189
   635
oheimb@4189
   636
  P(t_case f1 ... fn x) =
oheimb@4189
   637
    ~( (? y1 ... ym1. x = C1 y1 ... ym1 & ~P(f1 y1 ... ym1)) |
oheimb@4189
   638
        ...
oheimb@4189
   639
       (? y1 ... ymn. x = Cn y1 ... ymn & ~P(f1 y1 ... ymn))
oheimb@4189
   640
     )
oheimb@4930
   641
  which can be added to a simpset via `addsplits'. The existing theorems
oheimb@4930
   642
  expand_list_case and expand_option_case have been renamed to
oheimb@4930
   643
  split_list_case and split_option_case.
oheimb@4189
   644
nipkow@4361
   645
* HOL/Arithmetic:
nipkow@4361
   646
  - `pred n' is automatically converted to `n-1'.
nipkow@4361
   647
    Users are strongly encouraged not to use `pred' any longer,
nipkow@4361
   648
    because it will disappear altogether at some point.
nipkow@4361
   649
  - Users are strongly encouraged to write "0 < n" rather than
nipkow@4361
   650
    "n ~= 0". Theorems and proof tools have been modified towards this
nipkow@4361
   651
    `standard'.
nipkow@4357
   652
nipkow@4502
   653
* HOL/Lists:
nipkow@4502
   654
  the function "set_of_list" has been renamed "set" (and its theorems too);
nipkow@4502
   655
  the function "nth" now takes its arguments in the reverse order and
nipkow@4502
   656
  has acquired the infix notation "!" as in "xs!n".
paulson@3570
   657
paulson@4154
   658
* HOL/Set: UNIV is now a constant and is no longer translated to Compl{};
paulson@4154
   659
paulson@4154
   660
* HOL/Set: The operator (UN x.B x) now abbreviates (UN x:UNIV. B x) and its
paulson@4154
   661
  specialist theorems (like UN1_I) are gone.  Similarly for (INT x.B x);
paulson@4154
   662
wenzelm@4575
   663
* HOL/record: extensible records with schematic structural subtyping
wenzelm@4575
   664
(single inheritance); EXPERIMENTAL version demonstrating the encoding,
wenzelm@4575
   665
still lacks various theorems and concrete record syntax;
wenzelm@4575
   666
wenzelm@4125
   667
paulson@3715
   668
*** HOLCF ***
wenzelm@3535
   669
wenzelm@4125
   670
* removed "axioms" and "generated by" sections;
wenzelm@4125
   671
oheimb@4123
   672
* replaced "ops" section by extended "consts" section, which is capable of
wenzelm@4125
   673
  handling the continuous function space "->" directly;
wenzelm@4125
   674
wenzelm@4125
   675
* domain package:
wenzelm@4125
   676
  . proves theorems immediately and stores them in the theory,
wenzelm@4125
   677
  . creates hierachical name space,
wenzelm@4125
   678
  . now uses normal mixfix annotations (instead of cinfix...),
wenzelm@4125
   679
  . minor changes to some names and values (for consistency),
wenzelm@4125
   680
  . e.g. cases -> casedist, dists_eq -> dist_eqs, [take_lemma] -> take_lemmas,
wenzelm@4125
   681
  . separator between mutual domain defs: changed "," to "and",
wenzelm@4125
   682
  . improved handling of sort constraints;  now they have to
wenzelm@4125
   683
    appear on the left-hand side of the equations only;
oheimb@4123
   684
oheimb@4123
   685
* fixed LAM <x,y,zs>.b syntax;
wenzelm@3567
   686
wenzelm@3744
   687
* added extended adm_tac to simplifier in HOLCF -- can now discharge
wenzelm@3744
   688
adm (%x. P (t x)), where P is chainfinite and t continuous;
wenzelm@3579
   689
wenzelm@3579
   690
paulson@3719
   691
*** FOL and ZF ***
paulson@3719
   692
wenzelm@5726
   693
* FOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
   694
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
   695
wenzelm@3744
   696
* qed_spec_mp, qed_goal_spec_mp, qed_goalw_spec_mp are available, as
wenzelm@3744
   697
in HOL, they strip ALL and --> from proved theorems;
wenzelm@3744
   698
paulson@3719
   699
wenzelm@3579
   700
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New in Isabelle94-8 (May 1997)
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   702
------------------------------
wenzelm@2654
   703
paulson@3002
   704
*** General Changes ***
paulson@3002
   705
paulson@3002
   706
* new utilities to build / run / maintain Isabelle etc. (in parts
paulson@3002
   707
still somewhat experimental); old Makefiles etc. still functional;
wenzelm@2971
   708
wenzelm@3205
   709
* new 'Isabelle System Manual';
wenzelm@3205
   710
wenzelm@2825
   711
* INSTALL text, together with ./configure and ./build scripts;
wenzelm@2773
   712
wenzelm@3006
   713
* reimplemented type inference for greater efficiency, better error
wenzelm@3006
   714
messages and clean internal interface;
paulson@3002
   715
paulson@3002
   716
* prlim command for dealing with lots of subgoals (an easier way of
paulson@3002
   717
setting goals_limit);
paulson@3002
   718
wenzelm@3006
   719
wenzelm@3006
   720
*** Syntax ***
paulson@3002
   721
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   722
* supports alternative (named) syntax tables (parser and pretty
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   723
printer); internal interface is provided by add_modesyntax(_i);
wenzelm@3116
   724
paulson@3002
   725
* Pure, FOL, ZF, HOL, HOLCF now support symbolic input and output; to
paulson@3002
   726
be used in conjunction with the Isabelle symbol font; uses the
paulson@3002
   727
"symbols" syntax table;
paulson@3002
   728
wenzelm@2705
   729
* added token_translation interface (may translate name tokens in
wenzelm@2756
   730
arbitrary ways, dependent on their type (free, bound, tfree, ...) and
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   731
the current print_mode); IMPORTANT: user print translation functions
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   732
are responsible for marking newly introduced bounds
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   733
(Syntax.mark_boundT);
wenzelm@2705
   734
wenzelm@2730
   735
* token translations for modes "xterm" and "xterm_color" that display
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   736
names in bold, underline etc. or colors (which requires a color
wenzelm@3006
   737
version of xterm);
wenzelm@2730
   738
paulson@3002
   739
* infixes may now be declared with names independent of their syntax;
paulson@3002
   740
paulson@3002
   741
* added typed_print_translation (like print_translation, but may
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   742
access type of constant);
paulson@3002
   743
wenzelm@3006
   744
paulson@3002
   745
*** Classical Reasoner ***
paulson@3002
   746
paulson@3002
   747
Blast_tac: a new tactic!  It is often more powerful than fast_tac, but has
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   748
some limitations.  Blast_tac...
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   749
  + ignores addss, addbefore, addafter; this restriction is intrinsic
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   750
  + ignores elimination rules that don't have the correct format
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   751
        (the conclusion MUST be a formula variable)
paulson@3002
   752
  + ignores types, which can make HOL proofs fail
paulson@3002
   753
  + rules must not require higher-order unification, e.g. apply_type in ZF
paulson@3002
   754
    [message "Function Var's argument not a bound variable" relates to this]
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   755
  + its proof strategy is more general but can actually be slower
paulson@3002
   756
wenzelm@3107
   757
* substitution with equality assumptions no longer permutes other
wenzelm@3107
   758
assumptions;
paulson@3002
   759
paulson@3002
   760
* minor changes in semantics of addafter (now called addaltern); renamed
paulson@3002
   761
setwrapper to setWrapper and compwrapper to compWrapper; added safe wrapper
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   762
(and access functions for it);
paulson@3002
   763
wenzelm@5726
   764
* improved combination of classical reasoner and simplifier:
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   765
  + functions for handling clasimpsets
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   766
  + improvement of addss: now the simplifier is called _after_ the
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   767
    safe steps.
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   768
  + safe variant of addss called addSss: uses safe simplifications
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   769
    _during_ the safe steps. It is more complete as it allows multiple
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   770
    instantiations of unknowns (e.g. with slow_tac).
wenzelm@3006
   771
paulson@3002
   772
*** Simplifier ***
paulson@3002
   773
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   774
* added interface for simplification procedures (functions that
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   775
produce *proven* rewrite rules on the fly, depending on current
wenzelm@3006
   776
redex);
wenzelm@3006
   777
wenzelm@3006
   778
* ordering on terms as parameter (used for ordered rewriting);
wenzelm@3006
   779
wenzelm@3107
   780
* new functions delcongs, deleqcongs, and Delcongs. richer rep_ss;
paulson@3002
   781
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   782
* the solver is now split into a safe and an unsafe part.
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   783
This should be invisible for the normal user, except that the
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   784
functions setsolver and addsolver have been renamed to setSolver and
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   785
addSolver; added safe_asm_full_simp_tac;
paulson@3002
   786
paulson@3002
   787
paulson@3002
   788
*** HOL ***
paulson@3002
   789
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   790
* a generic induction tactic `induct_tac' which works for all datatypes and
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   791
also for type `nat';
nipkow@3042
   792
nipkow@3316
   793
* a generic case distinction tactic `exhaust_tac' which works for all
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   794
datatypes and also for type `nat';
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   795
nipkow@3316
   796
* each datatype comes with a function `size';
nipkow@3316
   797
paulson@3002
   798
* patterns in case expressions allow tuple patterns as arguments to
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   799
constructors, for example `case x of [] => ... | (x,y,z)#ps => ...';
paulson@3002
   800
paulson@3002
   801
* primrec now also works with type nat;
paulson@3002
   802
paulson@3338
   803
* recdef: a new declaration form, allows general recursive functions to be
paulson@3338
   804
defined in theory files.  See HOL/ex/Fib, HOL/ex/Primes, HOL/Subst/Unify.
paulson@3338
   805
paulson@3002
   806
* the constant for negation has been renamed from "not" to "Not" to
wenzelm@3107
   807
harmonize with FOL, ZF, LK, etc.;
paulson@3002
   808
wenzelm@3107
   809
* HOL/ex/LFilter theory of a corecursive "filter" functional for
wenzelm@3107
   810
infinite lists;
paulson@3002
   811
wenzelm@3227
   812
* HOL/Modelcheck demonstrates invocation of model checker oracle;
wenzelm@3227
   813
paulson@3002
   814
* HOL/ex/Ring.thy declares cring_simp, which solves equational
paulson@3002
   815
problems in commutative rings, using axiomatic type classes for + and *;
paulson@3002
   816
paulson@3002
   817
* more examples in HOL/MiniML and HOL/Auth;
paulson@3002
   818
paulson@3002
   819
* more default rewrite rules for quantifiers, union/intersection;
paulson@3002
   820
nipkow@3321
   821
* a new constant `arbitrary == @x.False';
nipkow@3321
   822
wenzelm@3107
   823
* HOLCF/IOA replaces old HOL/IOA;
wenzelm@3107
   824
wenzelm@5726
   825
* HOLCF changes: derived all rules and arities
wenzelm@5726
   826
  + axiomatic type classes instead of classes
slotosch@2653
   827
  + typedef instead of faking type definitions
paulson@2747
   828
  + eliminated the internal constants less_fun, less_cfun, UU_fun, UU_cfun etc.
wenzelm@2730
   829
  + new axclasses cpo, chfin, flat with flat < chfin < pcpo < cpo < po
slotosch@2653
   830
  + eliminated the types void, one, tr
slotosch@2653
   831
  + use unit lift and bool lift (with translations) instead of one and tr
slotosch@2653
   832
  + eliminated blift from Lift3.thy (use Def instead of blift)
wenzelm@3107
   833
  all eliminated rules are derived as theorems --> no visible changes ;
oheimb@2649
   834
wenzelm@3006
   835
paulson@3002
   836
*** ZF ***
wenzelm@2553
   837
paulson@2865
   838
* ZF now has Fast_tac, Simp_tac and Auto_tac.  Union_iff is a now a default
paulson@2865
   839
rewrite rule; this may affect some proofs.  eq_cs is gone but can be put back
paulson@2865
   840
as ZF_cs addSIs [equalityI];
wenzelm@2553
   841
wenzelm@2554
   842
wenzelm@2732
   843
wenzelm@2553
   844
New in Isabelle94-7 (November 96)
wenzelm@2553
   845
---------------------------------
wenzelm@2553
   846
wenzelm@2553
   847
* allowing negative levels (as offsets) in prlev and choplev;
wenzelm@2553
   848
wenzelm@2554
   849
* super-linear speedup for large simplifications;
wenzelm@2554
   850
wenzelm@2554
   851
* FOL, ZF and HOL now use miniscoping: rewriting pushes
wenzelm@2554
   852
quantifications in as far as possible (COULD MAKE EXISTING PROOFS
wenzelm@2554
   853
FAIL); can suppress it using the command Delsimps (ex_simps @
wenzelm@2554
   854
all_simps); De Morgan laws are also now included, by default;
wenzelm@2554
   855
wenzelm@2554
   856
* improved printing of ==>  :  ~:
wenzelm@2554
   857
wenzelm@2554
   858
* new object-logic "Sequents" adds linear logic, while replacing LK
wenzelm@2554
   859
and Modal (thanks to Sara Kalvala);
wenzelm@2554
   860
wenzelm@2554
   861
* HOL/Auth: correctness proofs for authentication protocols;
wenzelm@2554
   862
wenzelm@2554
   863
* HOL: new auto_tac combines rewriting and classical reasoning (many
wenzelm@2554
   864
examples on HOL/Auth);
wenzelm@2554
   865
wenzelm@2554
   866
* HOL: new command AddIffs for declaring theorems of the form P=Q to
wenzelm@2554
   867
the rewriter and classical reasoner simultaneously;
wenzelm@2554
   868
wenzelm@2554
   869
* function uresult no longer returns theorems in "standard" format;
wenzelm@2554
   870
regain previous version by: val uresult = standard o uresult;
wenzelm@2554
   871
wenzelm@2554
   872
wenzelm@2554
   873
wenzelm@2554
   874
New in Isabelle94-6
wenzelm@2554
   875
-------------------
wenzelm@2554
   876
wenzelm@2554
   877
* oracles -- these establish an interface between Isabelle and trusted
wenzelm@2554
   878
external reasoners, which may deliver results as theorems;
wenzelm@2554
   879
wenzelm@2554
   880
* proof objects (in particular record all uses of oracles);
wenzelm@2554
   881
wenzelm@2554
   882
* Simp_tac, Fast_tac, etc. that refer to implicit simpset / claset;
wenzelm@2554
   883
wenzelm@2554
   884
* "constdefs" section in theory files;
wenzelm@2554
   885
wenzelm@2554
   886
* "primrec" section (HOL) no longer requires names;
wenzelm@2554
   887
wenzelm@2554
   888
* internal type "tactic" now simply "thm -> thm Sequence.seq";
wenzelm@2554
   889
wenzelm@2554
   890
wenzelm@2554
   891
wenzelm@2554
   892
New in Isabelle94-5
wenzelm@2554
   893
-------------------
wenzelm@2554
   894
wenzelm@2554
   895
* reduced space requirements;
wenzelm@2554
   896
wenzelm@2554
   897
* automatic HTML generation from theories;
wenzelm@2554
   898
wenzelm@2554
   899
* theory files no longer require "..." (quotes) around most types;
wenzelm@2554
   900
wenzelm@2554
   901
* new examples, including two proofs of the Church-Rosser theorem;
wenzelm@2554
   902
wenzelm@2554
   903
* non-curried (1994) version of HOL is no longer distributed;
wenzelm@2554
   904
wenzelm@2553
   905
paulson@2557
   906
paulson@2557
   907
New in Isabelle94-4
paulson@2557
   908
-------------------
paulson@2557
   909
paulson@2747
   910
* greatly reduced space requirements;
paulson@2557
   911
paulson@2557
   912
* theory files (.thy) no longer require \...\ escapes at line breaks;
paulson@2557
   913
wenzelm@5726
   914
* searchable theorem database (see the section "Retrieving theorems" on
paulson@2557
   915
page 8 of the Reference Manual);
paulson@2557
   916
paulson@2557
   917
* new examples, including Grabczewski's monumental case study of the
paulson@2557
   918
Axiom of Choice;
paulson@2557
   919
paulson@2557
   920
* The previous version of HOL renamed to Old_HOL;
paulson@2557
   921
wenzelm@5726
   922
* The new version of HOL (previously called CHOL) uses a curried syntax
paulson@2557
   923
for functions.  Application looks like f a b instead of f(a,b);
paulson@2557
   924
paulson@2557
   925
* Mutually recursive inductive definitions finally work in HOL;
paulson@2557
   926
paulson@2557
   927
* In ZF, pattern-matching on tuples is now available in all abstractions and
paulson@2557
   928
translates to the operator "split";
paulson@2557
   929
paulson@2557
   930
paulson@2557
   931
paulson@2557
   932
New in Isabelle94-3
paulson@2557
   933
-------------------
paulson@2557
   934
wenzelm@5726
   935
* new infix operator, addss, allowing the classical reasoner to
paulson@2557
   936
perform simplification at each step of its search.  Example:
wenzelm@5726
   937
        fast_tac (cs addss ss)
paulson@2557
   938
wenzelm@5726
   939
* a new logic, CHOL, the same as HOL, but with a curried syntax
wenzelm@5726
   940
for functions.  Application looks like f a b instead of f(a,b).  Also pairs
paulson@2557
   941
look like (a,b) instead of <a,b>;
paulson@2557
   942
paulson@2557
   943
* PLEASE NOTE: CHOL will eventually replace HOL!
paulson@2557
   944
paulson@2557
   945
* In CHOL, pattern-matching on tuples is now available in all abstractions.
paulson@2557
   946
It translates to the operator "split".  A new theory of integers is available;
paulson@2557
   947
paulson@2557
   948
* In ZF, integer numerals now denote two's-complement binary integers.
paulson@2557
   949
Arithmetic operations can be performed by rewriting.  See ZF/ex/Bin.ML;
paulson@2557
   950
wenzelm@5726
   951
* Many new examples: I/O automata, Church-Rosser theorem, equivalents
paulson@2557
   952
of the Axiom of Choice;
paulson@2557
   953
paulson@2557
   954
paulson@2557
   955
paulson@2557
   956
New in Isabelle94-2
paulson@2557
   957
-------------------
paulson@2557
   958
wenzelm@5726
   959
* Significantly faster resolution;
paulson@2557
   960
paulson@2557
   961
* the different sections in a .thy file can now be mixed and repeated
paulson@2557
   962
freely;
paulson@2557
   963
paulson@2557
   964
* Database of theorems for FOL, HOL and ZF.  New
paulson@2557
   965
commands including qed, qed_goal and bind_thm store theorems in the database.
paulson@2557
   966
paulson@2557
   967
* Simple database queries: return a named theorem (get_thm) or all theorems of
paulson@2557
   968
a given theory (thms_of), or find out what theory a theorem was proved in
paulson@2557
   969
(theory_of_thm);
paulson@2557
   970
paulson@2557
   971
* Bugs fixed in the inductive definition and datatype packages;
paulson@2557
   972
paulson@2557
   973
* The classical reasoner provides deepen_tac and depth_tac, making FOL_dup_cs
paulson@2557
   974
and HOL_dup_cs obsolete;
paulson@2557
   975
paulson@2557
   976
* Syntactic ambiguities caused by the new treatment of syntax in Isabelle94-1
paulson@2557
   977
have been removed;
paulson@2557
   978
paulson@2557
   979
* Simpler definition of function space in ZF;
paulson@2557
   980
paulson@2557
   981
* new results about cardinal and ordinal arithmetic in ZF;
paulson@2557
   982
paulson@2557
   983
* 'subtype' facility in HOL for introducing new types as subsets of existing
paulson@2557
   984
types;
paulson@2557
   985
paulson@2557
   986
wenzelm@2553
   987
$Id$