NEWS
author wenzelm
Mon May 31 19:08:26 1999 +0200 (1999-05-31)
changeset 6751 0e346c73828c
parent 6671 677713791bd8
child 6795 35f214e73668
permissions -rw-r--r--
Isabelle manuals now also available as PDF;
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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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* HOL/typedef: fixed type inference for representing set; type
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arguments now have to occur explicitly on the rhs as type constraints;
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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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* Isabelle manuals now also available as PDF;
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* improved browser info generation: better HTML markup (including
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colors), graph views in several sizes; isatool usedir now provides a
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proper interface for user theories (via -P option);
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* theory loader rewritten from scratch (may not be fully
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bug-compatible); old loadpath variable has been replaced by show_path,
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add_path, del_path, reset_path functions; new operations such as
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update_thy, touch_thy, remove_thy (see also isatool doc ref);
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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 '$ISABELLE_HOME';
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* new flag show_tags controls display of tags of theorems (which are
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basically just comments that may be attached by some tools);
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* improved isatool install: option -k creates KDE application icon,
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option -p DIR installs standalone binaries;
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* added ML_PLATFORM setting (useful for cross-platform installations);
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more robust handling of platform specific ML images for SML/NJ;
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* Isamode 2.6 requires patch to accomodate change of Isabelle font
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mode and goal output format:
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diff -r Isamode-2.6/elisp/isa-load.el Isamode/elisp/isa-load.el
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244c244
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<       (list (isa-getenv "ISABELLE") "-msymbols" logic-name)
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---
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>       (list (isa-getenv "ISABELLE") "-misabelle_font" "-msymbols" logic-name)
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diff -r Isabelle-2.6/elisp/isa-proofstate.el Isamode/elisp/isa-proofstate.el
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181c181
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< (defconst proofstate-proofstart-regexp "^Level [0-9]+$"
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---
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> (defconst proofstate-proofstart-regexp "^Level [0-9]+"
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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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* New bounded quantifier syntax (input only):
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  ! x < y. P, ! x <= y. P, ? x < y. P, ? x <= y. P
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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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* HOL/typedef: fixed type inference for representing set; type
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arguments now have to occur explicitly on the rhs as type constraints;
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* HOL/recdef (TFL): requires theory Recdef; 'congs' syntax now expects
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comma separated list of theorem names rather than an ML expression;
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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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* AxClass.axclass_tac lost the theory argument;
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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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wenzelm@5217
   353
Consider using isatool fixdatatype to adapt your theories and proof
wenzelm@5217
   354
scripts to the new package (backup your sources first!).
wenzelm@5217
   355
wenzelm@5217
   356
wenzelm@5726
   357
* HOL/record package: considerably improved implementation; now
wenzelm@5726
   358
includes concrete syntax for record types, terms, updates; theorems
wenzelm@5726
   359
for surjective pairing and splitting !!-bound record variables; proof
wenzelm@5726
   360
support is as follows:
wenzelm@5726
   361
wenzelm@5726
   362
  1) standard conversions (selectors or updates applied to record
wenzelm@5726
   363
constructor terms) are part of the standard simpset;
wenzelm@5726
   364
wenzelm@5726
   365
  2) inject equations of the form ((x, y) = (x', y')) == x=x' & y=y' are
wenzelm@5726
   366
made part of standard simpset and claset via addIffs;
wenzelm@5726
   367
wenzelm@5726
   368
  3) a tactic for record field splitting (record_split_tac) is part of
wenzelm@5726
   369
the standard claset (addSWrapper);
wenzelm@5726
   370
wenzelm@5726
   371
To get a better idea about these rules you may retrieve them via
wenzelm@5726
   372
something like 'thms "foo.simps"' or 'thms "foo.iffs"', where "foo" is
wenzelm@5726
   373
the name of your record type.
wenzelm@5726
   374
wenzelm@5726
   375
The split tactic 3) conceptually simplifies by the following rule:
wenzelm@5726
   376
wenzelm@5726
   377
  "(!!x. PROP ?P x) == (!!a b. PROP ?P (a, b))"
wenzelm@5726
   378
wenzelm@5726
   379
Thus any record variable that is bound by meta-all will automatically
wenzelm@5726
   380
blow up into some record constructor term, consequently the
wenzelm@5726
   381
simplifications of 1), 2) apply.  Thus force_tac, auto_tac etc. shall
wenzelm@5726
   382
solve record problems automatically.
wenzelm@5726
   383
berghofe@5214
   384
wenzelm@5125
   385
* reorganized the main HOL image: HOL/Integ and String loaded by
wenzelm@5125
   386
default; theory Main includes everything;
wenzelm@5125
   387
paulson@5650
   388
* automatic simplification of integer sums and comparisons, using cancellation;
paulson@5650
   389
oheimb@5526
   390
* added option_map_eq_Some and not_Some_eq to the default simpset and claset;
wenzelm@5127
   391
wenzelm@5127
   392
* added disj_not1 = "(~P | Q) = (P --> Q)" to the default simpset;
wenzelm@5127
   393
wenzelm@5127
   394
* many new identities for unions, intersections, set difference, etc.;
wenzelm@5127
   395
wenzelm@5127
   396
* expand_if, expand_split, expand_sum_case and expand_nat_case are now
wenzelm@5127
   397
called split_if, split_split, split_sum_case and split_nat_case (to go
wenzelm@5127
   398
with add/delsplits);
wenzelm@5125
   399
wenzelm@5127
   400
* HOL/Prod introduces simplification procedure unit_eq_proc rewriting
wenzelm@5127
   401
(?x::unit) = (); this is made part of the default simpset, which COULD
wenzelm@5127
   402
MAKE EXISTING PROOFS FAIL under rare circumstances (consider
wenzelm@5207
   403
'Delsimprocs [unit_eq_proc];' as last resort); also note that
wenzelm@5207
   404
unit_abs_eta_conv is added in order to counter the effect of
wenzelm@5207
   405
unit_eq_proc on (%u::unit. f u), replacing it by f rather than by
wenzelm@5207
   406
%u.f();
wenzelm@5125
   407
wenzelm@5217
   408
* HOL/Fun INCOMPATIBILITY: `inj_onto' is now called `inj_on' (which
wenzelm@5217
   409
makes more sense);
berghofe@5109
   410
paulson@5475
   411
* HOL/Set INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
   412
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
   413
  disjointness reasoning but breaking a few old proofs.
paulson@5267
   414
wenzelm@5217
   415
* HOL/Relation INCOMPATIBILITY: renamed the relational operator r^-1
wenzelm@5217
   416
to 'converse' from 'inverse' (for compatibility with ZF and some
wenzelm@5217
   417
literature);
wenzelm@5085
   418
wenzelm@5127
   419
* HOL/recdef can now declare non-recursive functions, with {} supplied as
wenzelm@5127
   420
the well-founded relation;
oheimb@4838
   421
paulson@5490
   422
* HOL/Set INCOMPATIBILITY: the complement of set A is now written -A instead of
paulson@5490
   423
    Compl A.  The "Compl" syntax remains available as input syntax for this
paulson@5490
   424
    release ONLY.
paulson@5490
   425
wenzelm@5127
   426
* HOL/Update: new theory of function updates:
wenzelm@5127
   427
    f(a:=b) == %x. if x=a then b else f x
wenzelm@5127
   428
may also be iterated as in f(a:=b,c:=d,...);
nipkow@5077
   429
wenzelm@5127
   430
* HOL/Vimage: new theory for inverse image of a function, syntax f-``B;
paulson@4899
   431
nipkow@5282
   432
* HOL/List:
nipkow@5282
   433
  - new function list_update written xs[i:=v] that updates the i-th
nipkow@5282
   434
    list position. May also be iterated as in xs[i:=a,j:=b,...].
nipkow@5428
   435
  - new function `upt' written [i..j(] which generates the list
nipkow@5428
   436
    [i,i+1,...,j-1], i.e. the upper bound is excluded. To include the upper
nipkow@5428
   437
    bound write [i..j], which is a shorthand for [i..j+1(].
nipkow@5282
   438
  - new lexicographic orderings and corresponding wellfoundedness theorems.
paulson@4779
   439
wenzelm@5127
   440
* HOL/Arith:
wenzelm@5127
   441
  - removed 'pred' (predecessor) function;
wenzelm@5127
   442
  - generalized some theorems about n-1;
wenzelm@5127
   443
  - many new laws about "div" and "mod";
wenzelm@5127
   444
  - new laws about greatest common divisors (see theory ex/Primes);
oheimb@4766
   445
wenzelm@5127
   446
* HOL/Relation: renamed the relational operator r^-1 "converse"
wenzelm@4842
   447
instead of "inverse";
wenzelm@4711
   448
nipkow@5651
   449
* HOL/Induct/Multiset: a theory of multisets, including the wellfoundedness
nipkow@5651
   450
  of the multiset ordering;
nipkow@5651
   451
wenzelm@5127
   452
* directory HOL/Real: a construction of the reals using Dedekind cuts
nipkow@5651
   453
  (not included by default);
nipkow@4835
   454
wenzelm@5127
   455
* directory HOL/UNITY: Chandy and Misra's UNITY formalism;
wenzelm@4711
   456
nipkow@5651
   457
* directory HOL/Hoare: a new version of Hoare logic which permits many-sorted
nipkow@5651
   458
  programs, i.e. different program variables may have different types.
nipkow@5651
   459
paulson@5142
   460
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
   461
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
   462
  Now rew can involve either definitions or equalities (either == or =).
wenzelm@5002
   463
wenzelm@5363
   464
paulson@4879
   465
*** ZF ***
paulson@4879
   466
paulson@5332
   467
* theory Main includes everything; INCOMPATIBILITY: theory ZF.thy contains
paulson@5332
   468
  only the theorems proved on ZF.ML;
paulson@5160
   469
paulson@5475
   470
* ZF INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
   471
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
   472
  disjointness reasoning but breaking a few old proofs.
paulson@5267
   473
paulson@5160
   474
* ZF/Update: new theory of function updates
paulson@5160
   475
    with default rewrite rule  f(x:=y) ` z = if(z=x, y, f`z)
paulson@5160
   476
  may also be iterated as in f(a:=b,c:=d,...);
paulson@5160
   477
paulson@4879
   478
* in  let x=t in u(x), neither t nor u(x) has to be an FOL term.
oheimb@4649
   479
paulson@5142
   480
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
   481
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
   482
  Now rew can involve either definitions or equalities (either == or =).
paulson@5142
   483
paulson@5160
   484
* case_tac provided for compatibility with HOL
paulson@5160
   485
    (like the old excluded_middle_tac, but with subgoals swapped)
paulson@5160
   486
wenzelm@4842
   487
wenzelm@5127
   488
*** Internal programming interfaces ***
wenzelm@5002
   489
wenzelm@5251
   490
* Pure: several new basic modules made available for general use, see
wenzelm@5251
   491
also src/Pure/README;
wenzelm@5207
   492
wenzelm@5008
   493
* improved the theory data mechanism to support encapsulation (data
wenzelm@5008
   494
kind name replaced by private Object.kind, acting as authorization
wenzelm@5373
   495
key); new type-safe user interface via functor TheoryDataFun; generic
wenzelm@5373
   496
print_data function becomes basically useless;
wenzelm@5002
   497
wenzelm@5251
   498
* removed global_names compatibility flag -- all theory declarations
wenzelm@5251
   499
are qualified by default;
wenzelm@5251
   500
wenzelm@5085
   501
* module Pure/Syntax now offers quote / antiquote translation
wenzelm@5085
   502
functions (useful for Hoare logic etc. with implicit dependencies);
wenzelm@5373
   503
see HOL/ex/Antiquote for an example use;
wenzelm@5085
   504
wenzelm@5127
   505
* Simplifier now offers conversions (asm_)(full_)rewrite: simpset ->
wenzelm@5127
   506
cterm -> thm;
wenzelm@5127
   507
wenzelm@5207
   508
* new tactical CHANGED_GOAL for checking that a tactic modifies a
wenzelm@5207
   509
subgoal;
paulson@5142
   510
wenzelm@5251
   511
* Display.print_goals function moved to Locale.print_goals;
wenzelm@5251
   512
wenzelm@5731
   513
* standard print function for goals supports current_goals_markers
wenzelm@5731
   514
variable for marking begin of proof, end of proof, start of goal; the
wenzelm@5731
   515
default is ("", "", ""); setting current_goals_markers := ("<proof>",
wenzelm@5731
   516
"</proof>", "<goal>") causes SGML like tagged proof state printing,
wenzelm@5731
   517
for example;
wenzelm@5731
   518
wenzelm@5002
   519
wenzelm@5002
   520
wenzelm@4410
   521
New in Isabelle98 (January 1998)
wenzelm@4410
   522
--------------------------------
wenzelm@4410
   523
wenzelm@4410
   524
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4410
   525
wenzelm@4410
   526
* changed lexical syntax of terms / types: dots made part of long
wenzelm@4410
   527
identifiers, e.g. "%x.x" no longer possible, should be "%x. x";
wenzelm@4410
   528
wenzelm@4410
   529
* simpset (and claset) reference variable replaced by functions
wenzelm@4410
   530
simpset / simpset_ref;
wenzelm@4410
   531
wenzelm@4410
   532
* no longer supports theory aliases (via merge) and non-trivial
wenzelm@4410
   533
implicit merge of thms' signatures;
wenzelm@4410
   534
wenzelm@4410
   535
* most internal names of constants changed due to qualified names;
wenzelm@4410
   536
wenzelm@4410
   537
* changed Pure/Sequence interface (see Pure/seq.ML);
wenzelm@4410
   538
wenzelm@3454
   539
paulson@3715
   540
*** General Changes ***
paulson@3715
   541
wenzelm@4174
   542
* hierachically structured name spaces (for consts, types, axms, thms
wenzelm@3943
   543
etc.); new lexical class 'longid' (e.g. Foo.bar.x) may render much of
wenzelm@4108
   544
old input syntactically incorrect (e.g. "%x.x"); COMPATIBILITY:
wenzelm@4108
   545
isatool fixdots ensures space after dots (e.g. "%x. x"); set
wenzelm@4174
   546
long_names for fully qualified output names; NOTE: ML programs
wenzelm@4174
   547
(special tactics, packages etc.) referring to internal names may have
wenzelm@4174
   548
to be adapted to cope with fully qualified names; in case of severe
wenzelm@4174
   549
backward campatibility problems try setting 'global_names' at compile
wenzelm@4174
   550
time to have enrything declared within a flat name space; one may also
wenzelm@4174
   551
fine tune name declarations in theories via the 'global' and 'local'
wenzelm@4174
   552
section;
wenzelm@4108
   553
wenzelm@4108
   554
* reimplemented the implicit simpset and claset using the new anytype
wenzelm@4108
   555
data filed in signatures; references simpset:simpset ref etc. are
wenzelm@4108
   556
replaced by functions simpset:unit->simpset and
wenzelm@4108
   557
simpset_ref:unit->simpset ref; COMPATIBILITY: use isatool fixclasimp
wenzelm@4108
   558
to patch your ML files accordingly;
paulson@3856
   559
wenzelm@3857
   560
* HTML output now includes theory graph data for display with Java
wenzelm@3857
   561
applet or isatool browser; data generated automatically via isatool
wenzelm@3901
   562
usedir (see -i option, ISABELLE_USEDIR_OPTIONS);
wenzelm@3857
   563
paulson@3856
   564
* defs may now be conditional; improved rewrite_goals_tac to handle
paulson@3856
   565
conditional equations;
paulson@3856
   566
wenzelm@4174
   567
* defs now admits additional type arguments, using TYPE('a) syntax;
wenzelm@4174
   568
wenzelm@3901
   569
* theory aliases via merge (e.g. M=A+B+C) no longer supported, always
wenzelm@3901
   570
creates a new theory node; implicit merge of thms' signatures is
wenzelm@4112
   571
restricted to 'trivial' ones; COMPATIBILITY: one may have to use
wenzelm@3901
   572
transfer:theory->thm->thm in (rare) cases;
wenzelm@3901
   573
wenzelm@3968
   574
* improved handling of draft signatures / theories; draft thms (and
wenzelm@3968
   575
ctyps, cterms) are automatically promoted to real ones;
wenzelm@3968
   576
wenzelm@3901
   577
* slightly changed interfaces for oracles: admit many per theory, named
wenzelm@3901
   578
(e.g. oracle foo = mlfun), additional name argument for invoke_oracle;
wenzelm@3901
   579
wenzelm@3901
   580
* print_goals: optional output of const types (set show_consts and
wenzelm@3901
   581
show_types);
wenzelm@3851
   582
wenzelm@4388
   583
* improved output of warnings (###) and errors (***);
wenzelm@3697
   584
paulson@4178
   585
* subgoal_tac displays a warning if the new subgoal has type variables;
paulson@4178
   586
paulson@3715
   587
* removed old README and Makefiles;
wenzelm@3697
   588
paulson@3856
   589
* replaced print_goals_ref hook by print_current_goals_fn and result_error_fn;
wenzelm@3670
   590
paulson@3715
   591
* removed obsolete init_pps and init_database;
paulson@3715
   592
paulson@3715
   593
* deleted the obsolete tactical STATE, which was declared by
paulson@3715
   594
    fun STATE tacfun st = tacfun st st;
paulson@3715
   595
wenzelm@4388
   596
* cd and use now support path variables, e.g. $ISABELLE_HOME, or ~
wenzelm@4388
   597
(which abbreviates $HOME);
wenzelm@4269
   598
wenzelm@4269
   599
* changed Pure/Sequence interface (see Pure/seq.ML); COMPATIBILITY:
wenzelm@4269
   600
use isatool fixseq to adapt your ML programs (this works for fully
wenzelm@4269
   601
qualified references to the Sequence structure only!);
wenzelm@4269
   602
wenzelm@4381
   603
* use_thy no longer requires writable current directory; it always
wenzelm@4381
   604
reloads .ML *and* .thy file, if either one is out of date;
wenzelm@4269
   605
paulson@3715
   606
paulson@3715
   607
*** Classical Reasoner ***
paulson@3715
   608
wenzelm@3744
   609
* Clarify_tac, clarify_tac, clarify_step_tac, Clarify_step_tac: new
wenzelm@3744
   610
tactics that use classical reasoning to simplify a subgoal without
wenzelm@3744
   611
splitting it into several subgoals;
paulson@3715
   612
paulson@3719
   613
* Safe_tac: like safe_tac but uses the default claset;
paulson@3719
   614
paulson@3715
   615
paulson@3715
   616
*** Simplifier ***
paulson@3715
   617
paulson@3715
   618
* added simplification meta rules:
paulson@3715
   619
    (asm_)(full_)simplify: simpset -> thm -> thm;
paulson@3715
   620
paulson@3715
   621
* simplifier.ML no longer part of Pure -- has to be loaded by object
paulson@3715
   622
logics (again);
paulson@3715
   623
paulson@3715
   624
* added prems argument to simplification procedures;
paulson@3715
   625
paulson@4325
   626
* HOL, FOL, ZF: added infix function `addsplits':
paulson@4325
   627
  instead of `<simpset> setloop (split_tac <thms>)'
paulson@4325
   628
  you can simply write `<simpset> addsplits <thms>'
paulson@4325
   629
paulson@3715
   630
paulson@3715
   631
*** Syntax ***
paulson@3715
   632
wenzelm@4174
   633
* TYPE('a) syntax for type reflection terms;
wenzelm@4174
   634
wenzelm@3985
   635
* no longer handles consts with name "" -- declare as 'syntax' instead;
paulson@3856
   636
paulson@3856
   637
* pretty printer: changed order of mixfix annotation preference (again!);
wenzelm@3846
   638
paulson@3715
   639
* Pure: fixed idt/idts vs. pttrn/pttrns syntactic categories;
paulson@3715
   640
paulson@3715
   641
paulson@3715
   642
*** HOL ***
paulson@3715
   643
wenzelm@5726
   644
* HOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
   645
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
   646
nipkow@4035
   647
* HOL/TLA: Stephan Merz's formalization of Lamport's Temporal Logic of Actions;
wenzelm@3985
   648
wenzelm@3985
   649
* HOL/Auth: new protocol proofs including some for the Internet
nipkow@4035
   650
  protocol TLS;
wenzelm@3985
   651
wenzelm@4125
   652
* HOL/Map: new theory of `maps' a la VDM;
nipkow@3982
   653
wenzelm@4335
   654
* HOL/simplifier: simplification procedures nat_cancel_sums for
wenzelm@4335
   655
cancelling out common nat summands from =, <, <= (in)equalities, or
wenzelm@4335
   656
differences; simplification procedures nat_cancel_factor for
wenzelm@4335
   657
cancelling common factor from =, <, <= (in)equalities over natural
wenzelm@4373
   658
sums; nat_cancel contains both kinds of procedures, it is installed by
wenzelm@4373
   659
default in Arith.thy -- this COULD MAKE EXISTING PROOFS FAIL;
wenzelm@4335
   660
nipkow@3580
   661
* HOL/simplifier: terms of the form
paulson@4325
   662
  `? x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x)'  (or t=x)
nipkow@3580
   663
  are rewritten to
nipkow@4035
   664
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t)',
nipkow@4035
   665
  and those of the form
paulson@4325
   666
  `! x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x) --> R(x)'  (or t=x)
nipkow@4035
   667
  are rewritten to
nipkow@4035
   668
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t) --> R(t)',
nipkow@4035
   669
nipkow@4035
   670
* HOL/datatype
nipkow@4035
   671
  Each datatype `t' now comes with a theorem `split_t_case' of the form
nipkow@3580
   672
nipkow@4035
   673
  P(t_case f1 ... fn x) =
nipkow@4035
   674
     ( (!y1 ... ym1. x = C1 y1 ... ym1 --> P(f1 y1 ... ym1)) &
nipkow@4035
   675
        ...
oheimb@4189
   676
       (!y1 ... ymn. x = Cn y1 ... ymn --> P(f1 y1 ... ymn))
nipkow@4035
   677
     )
nipkow@4035
   678
oheimb@4930
   679
  and a theorem `split_t_case_asm' of the form
oheimb@4189
   680
oheimb@4189
   681
  P(t_case f1 ... fn x) =
oheimb@4189
   682
    ~( (? y1 ... ym1. x = C1 y1 ... ym1 & ~P(f1 y1 ... ym1)) |
oheimb@4189
   683
        ...
oheimb@4189
   684
       (? y1 ... ymn. x = Cn y1 ... ymn & ~P(f1 y1 ... ymn))
oheimb@4189
   685
     )
oheimb@4930
   686
  which can be added to a simpset via `addsplits'. The existing theorems
oheimb@4930
   687
  expand_list_case and expand_option_case have been renamed to
oheimb@4930
   688
  split_list_case and split_option_case.
oheimb@4189
   689
nipkow@4361
   690
* HOL/Arithmetic:
nipkow@4361
   691
  - `pred n' is automatically converted to `n-1'.
nipkow@4361
   692
    Users are strongly encouraged not to use `pred' any longer,
nipkow@4361
   693
    because it will disappear altogether at some point.
nipkow@4361
   694
  - Users are strongly encouraged to write "0 < n" rather than
nipkow@4361
   695
    "n ~= 0". Theorems and proof tools have been modified towards this
nipkow@4361
   696
    `standard'.
nipkow@4357
   697
nipkow@4502
   698
* HOL/Lists:
nipkow@4502
   699
  the function "set_of_list" has been renamed "set" (and its theorems too);
nipkow@4502
   700
  the function "nth" now takes its arguments in the reverse order and
nipkow@4502
   701
  has acquired the infix notation "!" as in "xs!n".
paulson@3570
   702
paulson@4154
   703
* HOL/Set: UNIV is now a constant and is no longer translated to Compl{};
paulson@4154
   704
paulson@4154
   705
* HOL/Set: The operator (UN x.B x) now abbreviates (UN x:UNIV. B x) and its
paulson@4154
   706
  specialist theorems (like UN1_I) are gone.  Similarly for (INT x.B x);
paulson@4154
   707
wenzelm@4575
   708
* HOL/record: extensible records with schematic structural subtyping
wenzelm@4575
   709
(single inheritance); EXPERIMENTAL version demonstrating the encoding,
wenzelm@4575
   710
still lacks various theorems and concrete record syntax;
wenzelm@4575
   711
wenzelm@4125
   712
paulson@3715
   713
*** HOLCF ***
wenzelm@3535
   714
wenzelm@4125
   715
* removed "axioms" and "generated by" sections;
wenzelm@4125
   716
oheimb@4123
   717
* replaced "ops" section by extended "consts" section, which is capable of
wenzelm@4125
   718
  handling the continuous function space "->" directly;
wenzelm@4125
   719
wenzelm@4125
   720
* domain package:
wenzelm@4125
   721
  . proves theorems immediately and stores them in the theory,
wenzelm@4125
   722
  . creates hierachical name space,
wenzelm@4125
   723
  . now uses normal mixfix annotations (instead of cinfix...),
wenzelm@4125
   724
  . minor changes to some names and values (for consistency),
wenzelm@4125
   725
  . e.g. cases -> casedist, dists_eq -> dist_eqs, [take_lemma] -> take_lemmas,
wenzelm@4125
   726
  . separator between mutual domain defs: changed "," to "and",
wenzelm@4125
   727
  . improved handling of sort constraints;  now they have to
wenzelm@4125
   728
    appear on the left-hand side of the equations only;
oheimb@4123
   729
oheimb@4123
   730
* fixed LAM <x,y,zs>.b syntax;
wenzelm@3567
   731
wenzelm@3744
   732
* added extended adm_tac to simplifier in HOLCF -- can now discharge
wenzelm@3744
   733
adm (%x. P (t x)), where P is chainfinite and t continuous;
wenzelm@3579
   734
wenzelm@3579
   735
paulson@3719
   736
*** FOL and ZF ***
paulson@3719
   737
wenzelm@5726
   738
* FOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
   739
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
   740
wenzelm@3744
   741
* qed_spec_mp, qed_goal_spec_mp, qed_goalw_spec_mp are available, as
wenzelm@3744
   742
in HOL, they strip ALL and --> from proved theorems;
wenzelm@3744
   743
paulson@3719
   744
wenzelm@3579
   745
wenzelm@3006
   746
New in Isabelle94-8 (May 1997)
wenzelm@3006
   747
------------------------------
wenzelm@2654
   748
paulson@3002
   749
*** General Changes ***
paulson@3002
   750
paulson@3002
   751
* new utilities to build / run / maintain Isabelle etc. (in parts
paulson@3002
   752
still somewhat experimental); old Makefiles etc. still functional;
wenzelm@2971
   753
wenzelm@3205
   754
* new 'Isabelle System Manual';
wenzelm@3205
   755
wenzelm@2825
   756
* INSTALL text, together with ./configure and ./build scripts;
wenzelm@2773
   757
wenzelm@3006
   758
* reimplemented type inference for greater efficiency, better error
wenzelm@3006
   759
messages and clean internal interface;
paulson@3002
   760
paulson@3002
   761
* prlim command for dealing with lots of subgoals (an easier way of
paulson@3002
   762
setting goals_limit);
paulson@3002
   763
wenzelm@3006
   764
wenzelm@3006
   765
*** Syntax ***
paulson@3002
   766
wenzelm@3116
   767
* supports alternative (named) syntax tables (parser and pretty
wenzelm@3116
   768
printer); internal interface is provided by add_modesyntax(_i);
wenzelm@3116
   769
paulson@3002
   770
* Pure, FOL, ZF, HOL, HOLCF now support symbolic input and output; to
paulson@3002
   771
be used in conjunction with the Isabelle symbol font; uses the
paulson@3002
   772
"symbols" syntax table;
paulson@3002
   773
wenzelm@2705
   774
* added token_translation interface (may translate name tokens in
wenzelm@2756
   775
arbitrary ways, dependent on their type (free, bound, tfree, ...) and
wenzelm@3116
   776
the current print_mode); IMPORTANT: user print translation functions
wenzelm@3116
   777
are responsible for marking newly introduced bounds
wenzelm@3116
   778
(Syntax.mark_boundT);
wenzelm@2705
   779
wenzelm@2730
   780
* token translations for modes "xterm" and "xterm_color" that display
wenzelm@3006
   781
names in bold, underline etc. or colors (which requires a color
wenzelm@3006
   782
version of xterm);
wenzelm@2730
   783
paulson@3002
   784
* infixes may now be declared with names independent of their syntax;
paulson@3002
   785
paulson@3002
   786
* added typed_print_translation (like print_translation, but may
paulson@3002
   787
access type of constant);
paulson@3002
   788
wenzelm@3006
   789
paulson@3002
   790
*** Classical Reasoner ***
paulson@3002
   791
paulson@3002
   792
Blast_tac: a new tactic!  It is often more powerful than fast_tac, but has
paulson@3002
   793
some limitations.  Blast_tac...
paulson@3002
   794
  + ignores addss, addbefore, addafter; this restriction is intrinsic
paulson@3002
   795
  + ignores elimination rules that don't have the correct format
wenzelm@5726
   796
        (the conclusion MUST be a formula variable)
paulson@3002
   797
  + ignores types, which can make HOL proofs fail
paulson@3002
   798
  + rules must not require higher-order unification, e.g. apply_type in ZF
paulson@3002
   799
    [message "Function Var's argument not a bound variable" relates to this]
paulson@3002
   800
  + its proof strategy is more general but can actually be slower
paulson@3002
   801
wenzelm@3107
   802
* substitution with equality assumptions no longer permutes other
wenzelm@3107
   803
assumptions;
paulson@3002
   804
paulson@3002
   805
* minor changes in semantics of addafter (now called addaltern); renamed
paulson@3002
   806
setwrapper to setWrapper and compwrapper to compWrapper; added safe wrapper
wenzelm@3107
   807
(and access functions for it);
paulson@3002
   808
wenzelm@5726
   809
* improved combination of classical reasoner and simplifier:
oheimb@3317
   810
  + functions for handling clasimpsets
oheimb@3317
   811
  + improvement of addss: now the simplifier is called _after_ the
oheimb@3317
   812
    safe steps.
oheimb@3317
   813
  + safe variant of addss called addSss: uses safe simplifications
wenzelm@5726
   814
    _during_ the safe steps. It is more complete as it allows multiple
oheimb@3317
   815
    instantiations of unknowns (e.g. with slow_tac).
wenzelm@3006
   816
paulson@3002
   817
*** Simplifier ***
paulson@3002
   818
wenzelm@3006
   819
* added interface for simplification procedures (functions that
wenzelm@3006
   820
produce *proven* rewrite rules on the fly, depending on current
wenzelm@3006
   821
redex);
wenzelm@3006
   822
wenzelm@3006
   823
* ordering on terms as parameter (used for ordered rewriting);
wenzelm@3006
   824
wenzelm@3107
   825
* new functions delcongs, deleqcongs, and Delcongs. richer rep_ss;
paulson@3002
   826
paulson@3002
   827
* the solver is now split into a safe and an unsafe part.
paulson@3002
   828
This should be invisible for the normal user, except that the
paulson@3002
   829
functions setsolver and addsolver have been renamed to setSolver and
wenzelm@3107
   830
addSolver; added safe_asm_full_simp_tac;
paulson@3002
   831
paulson@3002
   832
paulson@3002
   833
*** HOL ***
paulson@3002
   834
nipkow@3042
   835
* a generic induction tactic `induct_tac' which works for all datatypes and
wenzelm@3107
   836
also for type `nat';
nipkow@3042
   837
nipkow@3316
   838
* a generic case distinction tactic `exhaust_tac' which works for all
nipkow@3316
   839
datatypes and also for type `nat';
nipkow@3316
   840
nipkow@3316
   841
* each datatype comes with a function `size';
nipkow@3316
   842
paulson@3002
   843
* patterns in case expressions allow tuple patterns as arguments to
wenzelm@3107
   844
constructors, for example `case x of [] => ... | (x,y,z)#ps => ...';
paulson@3002
   845
paulson@3002
   846
* primrec now also works with type nat;
paulson@3002
   847
paulson@3338
   848
* recdef: a new declaration form, allows general recursive functions to be
paulson@3338
   849
defined in theory files.  See HOL/ex/Fib, HOL/ex/Primes, HOL/Subst/Unify.
paulson@3338
   850
paulson@3002
   851
* the constant for negation has been renamed from "not" to "Not" to
wenzelm@3107
   852
harmonize with FOL, ZF, LK, etc.;
paulson@3002
   853
wenzelm@3107
   854
* HOL/ex/LFilter theory of a corecursive "filter" functional for
wenzelm@3107
   855
infinite lists;
paulson@3002
   856
wenzelm@3227
   857
* HOL/Modelcheck demonstrates invocation of model checker oracle;
wenzelm@3227
   858
paulson@3002
   859
* HOL/ex/Ring.thy declares cring_simp, which solves equational
paulson@3002
   860
problems in commutative rings, using axiomatic type classes for + and *;
paulson@3002
   861
paulson@3002
   862
* more examples in HOL/MiniML and HOL/Auth;
paulson@3002
   863
paulson@3002
   864
* more default rewrite rules for quantifiers, union/intersection;
paulson@3002
   865
nipkow@3321
   866
* a new constant `arbitrary == @x.False';
nipkow@3321
   867
wenzelm@3107
   868
* HOLCF/IOA replaces old HOL/IOA;
wenzelm@3107
   869
wenzelm@5726
   870
* HOLCF changes: derived all rules and arities
wenzelm@5726
   871
  + axiomatic type classes instead of classes
slotosch@2653
   872
  + typedef instead of faking type definitions
paulson@2747
   873
  + eliminated the internal constants less_fun, less_cfun, UU_fun, UU_cfun etc.
wenzelm@2730
   874
  + new axclasses cpo, chfin, flat with flat < chfin < pcpo < cpo < po
slotosch@2653
   875
  + eliminated the types void, one, tr
slotosch@2653
   876
  + use unit lift and bool lift (with translations) instead of one and tr
slotosch@2653
   877
  + eliminated blift from Lift3.thy (use Def instead of blift)
wenzelm@3107
   878
  all eliminated rules are derived as theorems --> no visible changes ;
oheimb@2649
   879
wenzelm@3006
   880
paulson@3002
   881
*** ZF ***
wenzelm@2553
   882
paulson@2865
   883
* ZF now has Fast_tac, Simp_tac and Auto_tac.  Union_iff is a now a default
paulson@2865
   884
rewrite rule; this may affect some proofs.  eq_cs is gone but can be put back
paulson@2865
   885
as ZF_cs addSIs [equalityI];
wenzelm@2553
   886
wenzelm@2554
   887
wenzelm@2732
   888
wenzelm@2553
   889
New in Isabelle94-7 (November 96)
wenzelm@2553
   890
---------------------------------
wenzelm@2553
   891
wenzelm@2553
   892
* allowing negative levels (as offsets) in prlev and choplev;
wenzelm@2553
   893
wenzelm@2554
   894
* super-linear speedup for large simplifications;
wenzelm@2554
   895
wenzelm@2554
   896
* FOL, ZF and HOL now use miniscoping: rewriting pushes
wenzelm@2554
   897
quantifications in as far as possible (COULD MAKE EXISTING PROOFS
wenzelm@2554
   898
FAIL); can suppress it using the command Delsimps (ex_simps @
wenzelm@2554
   899
all_simps); De Morgan laws are also now included, by default;
wenzelm@2554
   900
wenzelm@2554
   901
* improved printing of ==>  :  ~:
wenzelm@2554
   902
wenzelm@2554
   903
* new object-logic "Sequents" adds linear logic, while replacing LK
wenzelm@2554
   904
and Modal (thanks to Sara Kalvala);
wenzelm@2554
   905
wenzelm@2554
   906
* HOL/Auth: correctness proofs for authentication protocols;
wenzelm@2554
   907
wenzelm@2554
   908
* HOL: new auto_tac combines rewriting and classical reasoning (many
wenzelm@2554
   909
examples on HOL/Auth);
wenzelm@2554
   910
wenzelm@2554
   911
* HOL: new command AddIffs for declaring theorems of the form P=Q to
wenzelm@2554
   912
the rewriter and classical reasoner simultaneously;
wenzelm@2554
   913
wenzelm@2554
   914
* function uresult no longer returns theorems in "standard" format;
wenzelm@2554
   915
regain previous version by: val uresult = standard o uresult;
wenzelm@2554
   916
wenzelm@2554
   917
wenzelm@2554
   918
wenzelm@2554
   919
New in Isabelle94-6
wenzelm@2554
   920
-------------------
wenzelm@2554
   921
wenzelm@2554
   922
* oracles -- these establish an interface between Isabelle and trusted
wenzelm@2554
   923
external reasoners, which may deliver results as theorems;
wenzelm@2554
   924
wenzelm@2554
   925
* proof objects (in particular record all uses of oracles);
wenzelm@2554
   926
wenzelm@2554
   927
* Simp_tac, Fast_tac, etc. that refer to implicit simpset / claset;
wenzelm@2554
   928
wenzelm@2554
   929
* "constdefs" section in theory files;
wenzelm@2554
   930
wenzelm@2554
   931
* "primrec" section (HOL) no longer requires names;
wenzelm@2554
   932
wenzelm@2554
   933
* internal type "tactic" now simply "thm -> thm Sequence.seq";
wenzelm@2554
   934
wenzelm@2554
   935
wenzelm@2554
   936
wenzelm@2554
   937
New in Isabelle94-5
wenzelm@2554
   938
-------------------
wenzelm@2554
   939
wenzelm@2554
   940
* reduced space requirements;
wenzelm@2554
   941
wenzelm@2554
   942
* automatic HTML generation from theories;
wenzelm@2554
   943
wenzelm@2554
   944
* theory files no longer require "..." (quotes) around most types;
wenzelm@2554
   945
wenzelm@2554
   946
* new examples, including two proofs of the Church-Rosser theorem;
wenzelm@2554
   947
wenzelm@2554
   948
* non-curried (1994) version of HOL is no longer distributed;
wenzelm@2554
   949
wenzelm@2553
   950
paulson@2557
   951
paulson@2557
   952
New in Isabelle94-4
paulson@2557
   953
-------------------
paulson@2557
   954
paulson@2747
   955
* greatly reduced space requirements;
paulson@2557
   956
paulson@2557
   957
* theory files (.thy) no longer require \...\ escapes at line breaks;
paulson@2557
   958
wenzelm@5726
   959
* searchable theorem database (see the section "Retrieving theorems" on
paulson@2557
   960
page 8 of the Reference Manual);
paulson@2557
   961
paulson@2557
   962
* new examples, including Grabczewski's monumental case study of the
paulson@2557
   963
Axiom of Choice;
paulson@2557
   964
paulson@2557
   965
* The previous version of HOL renamed to Old_HOL;
paulson@2557
   966
wenzelm@5726
   967
* The new version of HOL (previously called CHOL) uses a curried syntax
paulson@2557
   968
for functions.  Application looks like f a b instead of f(a,b);
paulson@2557
   969
paulson@2557
   970
* Mutually recursive inductive definitions finally work in HOL;
paulson@2557
   971
paulson@2557
   972
* In ZF, pattern-matching on tuples is now available in all abstractions and
paulson@2557
   973
translates to the operator "split";
paulson@2557
   974
paulson@2557
   975
paulson@2557
   976
paulson@2557
   977
New in Isabelle94-3
paulson@2557
   978
-------------------
paulson@2557
   979
wenzelm@5726
   980
* new infix operator, addss, allowing the classical reasoner to
paulson@2557
   981
perform simplification at each step of its search.  Example:
wenzelm@5726
   982
        fast_tac (cs addss ss)
paulson@2557
   983
wenzelm@5726
   984
* a new logic, CHOL, the same as HOL, but with a curried syntax
wenzelm@5726
   985
for functions.  Application looks like f a b instead of f(a,b).  Also pairs
paulson@2557
   986
look like (a,b) instead of <a,b>;
paulson@2557
   987
paulson@2557
   988
* PLEASE NOTE: CHOL will eventually replace HOL!
paulson@2557
   989
paulson@2557
   990
* In CHOL, pattern-matching on tuples is now available in all abstractions.
paulson@2557
   991
It translates to the operator "split".  A new theory of integers is available;
paulson@2557
   992
paulson@2557
   993
* In ZF, integer numerals now denote two's-complement binary integers.
paulson@2557
   994
Arithmetic operations can be performed by rewriting.  See ZF/ex/Bin.ML;
paulson@2557
   995
wenzelm@5726
   996
* Many new examples: I/O automata, Church-Rosser theorem, equivalents
paulson@2557
   997
of the Axiom of Choice;
paulson@2557
   998
paulson@2557
   999
paulson@2557
  1000
paulson@2557
  1001
New in Isabelle94-2
paulson@2557
  1002
-------------------
paulson@2557
  1003
wenzelm@5726
  1004
* Significantly faster resolution;
paulson@2557
  1005
paulson@2557
  1006
* the different sections in a .thy file can now be mixed and repeated
paulson@2557
  1007
freely;
paulson@2557
  1008
paulson@2557
  1009
* Database of theorems for FOL, HOL and ZF.  New
paulson@2557
  1010
commands including qed, qed_goal and bind_thm store theorems in the database.
paulson@2557
  1011
paulson@2557
  1012
* Simple database queries: return a named theorem (get_thm) or all theorems of
paulson@2557
  1013
a given theory (thms_of), or find out what theory a theorem was proved in
paulson@2557
  1014
(theory_of_thm);
paulson@2557
  1015
paulson@2557
  1016
* Bugs fixed in the inductive definition and datatype packages;
paulson@2557
  1017
paulson@2557
  1018
* The classical reasoner provides deepen_tac and depth_tac, making FOL_dup_cs
paulson@2557
  1019
and HOL_dup_cs obsolete;
paulson@2557
  1020
paulson@2557
  1021
* Syntactic ambiguities caused by the new treatment of syntax in Isabelle94-1
paulson@2557
  1022
have been removed;
paulson@2557
  1023
paulson@2557
  1024
* Simpler definition of function space in ZF;
paulson@2557
  1025
paulson@2557
  1026
* new results about cardinal and ordinal arithmetic in ZF;
paulson@2557
  1027
paulson@2557
  1028
* 'subtype' facility in HOL for introducing new types as subsets of existing
paulson@2557
  1029
types;
paulson@2557
  1030
paulson@2557
  1031
wenzelm@2553
  1032
$Id$