NEWS
author wenzelm
Mon Oct 04 21:34:20 1999 +0200 (1999-10-04)
changeset 7691 b7e8277fa088
parent 7647 2ceddd91cd0a
child 7780 099742c562aa
permissions -rw-r--r--
added BVC;
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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: The THEN and ELSE parts of conditional expressions (if P then x else y)
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are no longer simplified.  (This allows the simplifier to unfold recursive
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functional programs.)  To restore the old behaviour, declare
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    Delcongs [if_weak_cong];
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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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* HOL/List: the constructors of type list are now Nil and Cons;
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* Simplifier: the type of the infix ML functions
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	setSSolver addSSolver setSolver addSolver
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is now  simpset * solver -> simpset  where `solver' is a new abstract type
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for packaging solvers. A solver is created via
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	mk_solver: string -> (thm list -> int -> tactic) -> solver
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where the string argument is only a comment.
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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', `int', and `real' in HOL (see below); it can, should and
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will be instantiated for other types and logics as well.
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* The simplifier now accepts rewrite rules with flexible heads, eg
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     hom ?f ==> ?f(?x+?y) = ?f ?x + ?f ?y
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  They are applied like any rule with a non-pattern lhs, i.e. by first-order
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  matching.
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*** General ***
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* new Isabelle/Isar subsystem provides an alternative to traditional
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tactical theorem proving; together with the ProofGeneral/isar user
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interface it offers an interactive environment for developing human
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readable proof documents (Isar == Intelligible semi-automated
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reasoning); see isatool doc isar-ref and
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http://isabelle.in.tum.de/Isar/ for more information;
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* native support for Proof General, both for classic Isabelle and
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Isabelle/Isar (the latter is slightly better supported and more
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robust);
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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, use/update_thy_only (see also
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isatool doc ref);
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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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* path element specification '~~' refers to '$ISABELLE_HOME';
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* in locales, the "assumes" and "defines" parts may be omitted if
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empty;
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* new print_mode "xsymbols" for extended symbol support (e.g. genuine
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long arrows);
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* new print_mode "HTML";
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* new flag show_tags controls display of tags of theorems (which are
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basically just comments that may be attached by some tools);
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* Isamode 2.6 requires patch to accomodate change of Isabelle font
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mode and goal output format:
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diff -r Isamode-2.6/elisp/isa-load.el Isamode/elisp/isa-load.el
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244c244
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<       (list (isa-getenv "ISABELLE") "-msymbols" logic-name)
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---
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>       (list (isa-getenv "ISABELLE") "-misabelle_font" "-msymbols" logic-name)
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diff -r Isabelle-2.6/elisp/isa-proofstate.el Isamode/elisp/isa-proofstate.el
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181c181
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< (defconst proofstate-proofstart-regexp "^Level [0-9]+$"
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---
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> (defconst proofstate-proofstart-regexp "^Level [0-9]+"
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* function bind_thms stores lists of theorems (cf. bind_thm);
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* new shorthand tactics ftac, eatac, datac, fatac;
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* qed (and friends) now accept "" as result name; in that case the
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result is not stored, but proper checks and presentation of the result
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still apply;
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*** HOL ***
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** HOL arithmetic **
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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/Numeral provides a generic theory of numerals (encoded
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efficiently as bit strings); setup for types nat/int/real is in place;
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INCOMPATIBILITY: since numeral syntax is now polymorphic, rather than
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int, existing theories and proof scripts may require a few additional
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type constraints;
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* integer division and remainder can now be performed on constant
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arguments;
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* many properties of integer multiplication, division and remainder
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are now available;
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* An interface to the Stanford Validity Checker (SVC) is available through the
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tactic svc_tac.  Propositional tautologies and theorems of linear arithmetic
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are proved automatically.  SVC must be installed separately, and its results
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must be TAKEN ON TRUST (Isabelle does not check the proofs, but tags any
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invocation of the underlying oracle).  For SVC see
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  http://verify.stanford.edu/SVC
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* IsaMakefile: the HOL-Real target now builds an actual image;
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** HOL misc **
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* HOL/Real/HahnBanach: the Hahn-Banach theorem for real vector spaces
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(in Isabelle/Isar) -- by Gertrud Bauer;
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* HOL/BCV: generic model of bytecode verification, i.e. data-flow
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analysis for assembly languages with subtypes;
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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/datatype: Now also handles arbitrarily branching datatypes
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  (using function types) such as
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  datatype 'a tree = Atom 'a | Branch "nat => 'a tree"
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* HOL/record: record_simproc (part of the default simpset) takes care
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of selectors applied to updated records; record_split_tac is no longer
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part of the default claset; update_defs may now be removed from the
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simpset in many cases; COMPATIBILITY: old behavior achieved by
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  claset_ref () := claset() addSWrapper record_split_wrapper;
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  Delsimprocs [record_simproc]
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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): 'congs' syntax now expects comma separated list of theorem
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names rather than an ML expression;
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* HOL/defer_recdef (TFL): like recdef but the well-founded relation can be
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supplied later.  Program schemes can be defined, such as
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    "While B C s = (if B s then While B C (C s) else s)"
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where the well-founded relation can be chosen after B and C have been given.
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* HOL/List: the constructors of type list are now Nil and Cons;
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INCOMPATIBILITY: while [] and infix # syntax is still there, of
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course, ML tools referring to List.list.op # etc. have to be adapted;
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* HOL_quantifiers flag superseded by "HOL" print mode, which is
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disabled by default; run isabelle with option -m HOL to get back to
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the original Gordon/HOL-style output;
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* HOL/Ord.thy: new bounded quantifier syntax (input only): ALL x<y. P,
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ALL x<=y. P, EX x<y. P, EX x<=y. P;
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* HOL basic syntax simplified (more orthogonal): all variants of
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All/Ex now support plain / symbolic / HOL notation; plain syntax for
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Eps operator is provided as well: "SOME x. P[x]";
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* HOL/Sum.thy: sum_case has been moved to HOL/Datatype;
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* HOL/Univ.thy: infix syntax <*>, <+>, <**>, <+> eliminated and made
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thus available for user theories;
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* HOLCF/IOA/Sequents: renamed 'Cons' to 'Consq' to avoid clash with
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HOL/List; hardly an INCOMPATIBILITY since '>>' syntax is used all the
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time;
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* HOL: new tactic smp_tac: int -> int -> tactic, which applies spec several
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  times and then mp
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*** LK ***
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* the notation <<...>> is now available as a notation for sequences of
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formulas;
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* the simplifier is now installed
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* the axiom system has been generalized (thanks to Soren Heilmann) 
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* the classical reasoner now has a default rule database
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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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* structures Vartab / Termtab (instances of TableFun) offer efficient
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tables indexed by indexname_ord / term_ord (compatible with aconv);
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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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* theory loader actions may be traced via new ThyInfo.add_hook
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interface (see src/Pure/Thy/thy_info.ML); example application: keep
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your own database of information attached to *whole* theories -- as
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opposed to intra-theory data slots offered via TheoryDataFun;
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* proper handling of dangling sort hypotheses (at last!);
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Thm.strip_shyps and Drule.strip_shyps_warning take care of removing
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extra sort hypotheses that can be witnessed from the type signature;
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the force_strip_shyps is gone, any remaining shyps are simply left in
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the theorem (with a warning issued by strip_shyps_warning);
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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;
oheimb@4649
   353
wenzelm@5705
   354
* Classical reasoner: addbefore/addSbefore now have APPEND/ORELSE
wenzelm@5726
   355
semantics; addbefore now affects only the unsafe part of step_tac
wenzelm@5726
   356
etc.; this affects addss/auto_tac/force_tac, so EXISTING PROOFS MAY
wenzelm@5726
   357
FAIL, but proofs should be fixable easily, e.g. by replacing Auto_tac
wenzelm@5726
   358
by Force_tac;
oheimb@5524
   359
wenzelm@5726
   360
* Classical reasoner: setwrapper to setWrapper and compwrapper to
wenzelm@5726
   361
compWrapper; added safe wrapper (and access functions for it);
oheimb@5524
   362
wenzelm@5127
   363
* HOL/split_all_tac is now much faster and fails if there is nothing
wenzelm@5726
   364
to split.  Some EXISTING PROOFS MAY REQUIRE ADAPTION because the order
wenzelm@5726
   365
and the names of the automatically generated variables have changed.
wenzelm@5726
   366
split_all_tac has moved within claset() from unsafe wrappers to safe
wenzelm@5726
   367
wrappers, which means that !!-bound variables are split much more
wenzelm@5726
   368
aggressively, and safe_tac and clarify_tac now split such variables.
wenzelm@5726
   369
If this splitting is not appropriate, use delSWrapper "split_all_tac".
wenzelm@5726
   370
Note: the same holds for record_split_tac, which does the job of
wenzelm@5726
   371
split_all_tac for record fields.
wenzelm@5127
   372
wenzelm@5726
   373
* HOL/Simplifier: Rewrite rules for case distinctions can now be added
wenzelm@5726
   374
permanently to the default simpset using Addsplits just like
wenzelm@5726
   375
Addsimps. They can be removed via Delsplits just like
wenzelm@5726
   376
Delsimps. Lower-case versions are also available.
wenzelm@5127
   377
wenzelm@5726
   378
* HOL/Simplifier: The rule split_if is now part of the default
wenzelm@5726
   379
simpset. This means that the simplifier will eliminate all occurrences
wenzelm@5726
   380
of if-then-else in the conclusion of a goal. To prevent this, you can
wenzelm@5726
   381
either remove split_if completely from the default simpset by
wenzelm@5726
   382
`Delsplits [split_if]' or remove it in a specific call of the
wenzelm@5726
   383
simplifier using `... delsplits [split_if]'.  You can also add/delete
wenzelm@5726
   384
other case splitting rules to/from the default simpset: every datatype
wenzelm@5726
   385
generates suitable rules `split_t_case' and `split_t_case_asm' (where
wenzelm@5726
   386
t is the name of the datatype).
wenzelm@5127
   387
wenzelm@5726
   388
* Classical reasoner / Simplifier combination: new force_tac (and
wenzelm@5127
   389
derivatives Force_tac, force) combines rewriting and classical
wenzelm@5127
   390
reasoning (and whatever other tools) similarly to auto_tac, but is
wenzelm@5726
   391
aimed to solve the given subgoal completely.
wenzelm@5127
   392
wenzelm@5127
   393
wenzelm@5127
   394
*** General ***
wenzelm@5127
   395
wenzelm@5217
   396
* new top-level commands `Goal' and `Goalw' that improve upon `goal'
wenzelm@5127
   397
and `goalw': the theory is no longer needed as an explicit argument -
wenzelm@5127
   398
the current theory context is used; assumptions are no longer returned
wenzelm@5127
   399
at the ML-level unless one of them starts with ==> or !!; it is
wenzelm@5217
   400
recommended to convert to these new commands using isatool fixgoal
wenzelm@5217
   401
(backup your sources first!);
wenzelm@4842
   402
wenzelm@5217
   403
* new top-level commands 'thm' and 'thms' for retrieving theorems from
wenzelm@5207
   404
the current theory context, and 'theory' to lookup stored theories;
paulson@4806
   405
paulson@5722
   406
* new theory section 'locale' for declaring constants, assumptions and
paulson@5722
   407
definitions that have local scope;
paulson@5722
   408
wenzelm@5127
   409
* new theory section 'nonterminals' for purely syntactic types;
wenzelm@4858
   410
wenzelm@5127
   411
* new theory section 'setup' for generic ML setup functions
wenzelm@5127
   412
(e.g. package initialization);
wenzelm@4869
   413
wenzelm@5131
   414
* the distribution now includes Isabelle icons: see
wenzelm@5131
   415
lib/logo/isabelle-{small,tiny}.xpm;
wenzelm@5131
   416
wenzelm@5363
   417
* isatool install - install binaries with absolute references to
wenzelm@5363
   418
ISABELLE_HOME/bin;
wenzelm@5363
   419
wenzelm@5572
   420
* isatool logo -- create instances of the Isabelle logo (as EPS);
wenzelm@5572
   421
wenzelm@5407
   422
* print mode 'emacs' reserved for Isamode;
wenzelm@5407
   423
wenzelm@5726
   424
* support multiple print (ast) translations per constant name;
wenzelm@5726
   425
wenzelm@6925
   426
* theorems involving oracles are now printed with a suffixed [!];
wenzelm@6925
   427
wenzelm@4711
   428
paulson@4661
   429
*** HOL ***
paulson@4661
   430
wenzelm@5710
   431
* there is now a tutorial on Isabelle/HOL (do 'isatool doc tutorial');
nipkow@5709
   432
wenzelm@5217
   433
* HOL/inductive package reorganized and improved: now supports mutual
paulson@5267
   434
definitions such as
wenzelm@5217
   435
wenzelm@5217
   436
  inductive EVEN ODD
wenzelm@5217
   437
    intrs
wenzelm@5217
   438
      null "0 : EVEN"
wenzelm@5217
   439
      oddI "n : EVEN ==> Suc n : ODD"
wenzelm@5217
   440
      evenI "n : ODD ==> Suc n : EVEN"
wenzelm@5217
   441
wenzelm@5217
   442
new theorem list "elims" contains an elimination rule for each of the
wenzelm@5217
   443
recursive sets; inductive definitions now handle disjunctive premises
wenzelm@5217
   444
correctly (also ZF);
berghofe@5214
   445
wenzelm@5217
   446
INCOMPATIBILITIES: requires Inductive as an ancestor; component
wenzelm@5217
   447
"mutual_induct" no longer exists - the induction rule is always
wenzelm@5217
   448
contained in "induct";
wenzelm@5217
   449
wenzelm@5217
   450
wenzelm@5217
   451
* HOL/datatype package re-implemented and greatly improved: now
paulson@5267
   452
supports mutually recursive datatypes such as
wenzelm@5217
   453
wenzelm@5217
   454
  datatype
wenzelm@5217
   455
    'a aexp = IF_THEN_ELSE ('a bexp) ('a aexp) ('a aexp)
wenzelm@5217
   456
            | SUM ('a aexp) ('a aexp)
wenzelm@5217
   457
            | DIFF ('a aexp) ('a aexp)
wenzelm@5217
   458
            | NUM 'a
wenzelm@5217
   459
  and
wenzelm@5217
   460
    'a bexp = LESS ('a aexp) ('a aexp)
wenzelm@5217
   461
            | AND ('a bexp) ('a bexp)
wenzelm@5217
   462
            | OR ('a bexp) ('a bexp)
wenzelm@5217
   463
paulson@5267
   464
as well as indirectly recursive datatypes such as
berghofe@5214
   465
wenzelm@5217
   466
  datatype
wenzelm@5217
   467
    ('a, 'b) term = Var 'a
wenzelm@5217
   468
                  | App 'b ((('a, 'b) term) list)
berghofe@5214
   469
wenzelm@5217
   470
The new tactic  mutual_induct_tac [<var_1>, ..., <var_n>] i  performs
wenzelm@5217
   471
induction on mutually / indirectly recursive datatypes.
wenzelm@5217
   472
wenzelm@5217
   473
Primrec equations are now stored in theory and can be accessed via
wenzelm@5217
   474
<function_name>.simps.
wenzelm@5217
   475
wenzelm@5217
   476
INCOMPATIBILITIES:
berghofe@5214
   477
wenzelm@5217
   478
  - Theories using datatypes must now have theory Datatype as an
wenzelm@5217
   479
    ancestor.
wenzelm@5217
   480
  - The specific <typename>.induct_tac no longer exists - use the
wenzelm@5217
   481
    generic induct_tac instead.
berghofe@5226
   482
  - natE has been renamed to nat.exhaust - use exhaust_tac
wenzelm@5217
   483
    instead of res_inst_tac ... natE. Note that the variable
berghofe@5226
   484
    names in nat.exhaust differ from the names in natE, this
wenzelm@5217
   485
    may cause some "fragile" proofs to fail.
wenzelm@5217
   486
  - The theorems split_<typename>_case and split_<typename>_case_asm
wenzelm@5217
   487
    have been renamed to <typename>.split and <typename>.split_asm.
wenzelm@5217
   488
  - Since default sorts of type variables are now handled correctly,
wenzelm@5217
   489
    some datatype definitions may have to be annotated with explicit
wenzelm@5217
   490
    sort constraints.
wenzelm@5217
   491
  - Primrec definitions no longer require function name and type
wenzelm@5217
   492
    of recursive argument.
berghofe@5214
   493
wenzelm@5217
   494
Consider using isatool fixdatatype to adapt your theories and proof
wenzelm@5217
   495
scripts to the new package (backup your sources first!).
wenzelm@5217
   496
wenzelm@5217
   497
wenzelm@5726
   498
* HOL/record package: considerably improved implementation; now
wenzelm@5726
   499
includes concrete syntax for record types, terms, updates; theorems
wenzelm@5726
   500
for surjective pairing and splitting !!-bound record variables; proof
wenzelm@5726
   501
support is as follows:
wenzelm@5726
   502
wenzelm@5726
   503
  1) standard conversions (selectors or updates applied to record
wenzelm@5726
   504
constructor terms) are part of the standard simpset;
wenzelm@5726
   505
wenzelm@5726
   506
  2) inject equations of the form ((x, y) = (x', y')) == x=x' & y=y' are
wenzelm@5726
   507
made part of standard simpset and claset via addIffs;
wenzelm@5726
   508
wenzelm@5726
   509
  3) a tactic for record field splitting (record_split_tac) is part of
wenzelm@5726
   510
the standard claset (addSWrapper);
wenzelm@5726
   511
wenzelm@5726
   512
To get a better idea about these rules you may retrieve them via
wenzelm@5726
   513
something like 'thms "foo.simps"' or 'thms "foo.iffs"', where "foo" is
wenzelm@5726
   514
the name of your record type.
wenzelm@5726
   515
wenzelm@5726
   516
The split tactic 3) conceptually simplifies by the following rule:
wenzelm@5726
   517
wenzelm@5726
   518
  "(!!x. PROP ?P x) == (!!a b. PROP ?P (a, b))"
wenzelm@5726
   519
wenzelm@5726
   520
Thus any record variable that is bound by meta-all will automatically
wenzelm@5726
   521
blow up into some record constructor term, consequently the
wenzelm@5726
   522
simplifications of 1), 2) apply.  Thus force_tac, auto_tac etc. shall
wenzelm@5726
   523
solve record problems automatically.
wenzelm@5726
   524
berghofe@5214
   525
wenzelm@5125
   526
* reorganized the main HOL image: HOL/Integ and String loaded by
wenzelm@5125
   527
default; theory Main includes everything;
wenzelm@5125
   528
paulson@5650
   529
* automatic simplification of integer sums and comparisons, using cancellation;
paulson@5650
   530
oheimb@5526
   531
* added option_map_eq_Some and not_Some_eq to the default simpset and claset;
wenzelm@5127
   532
wenzelm@5127
   533
* added disj_not1 = "(~P | Q) = (P --> Q)" to the default simpset;
wenzelm@5127
   534
wenzelm@5127
   535
* many new identities for unions, intersections, set difference, etc.;
wenzelm@5127
   536
wenzelm@5127
   537
* expand_if, expand_split, expand_sum_case and expand_nat_case are now
wenzelm@5127
   538
called split_if, split_split, split_sum_case and split_nat_case (to go
wenzelm@5127
   539
with add/delsplits);
wenzelm@5125
   540
wenzelm@5127
   541
* HOL/Prod introduces simplification procedure unit_eq_proc rewriting
wenzelm@5127
   542
(?x::unit) = (); this is made part of the default simpset, which COULD
wenzelm@5127
   543
MAKE EXISTING PROOFS FAIL under rare circumstances (consider
wenzelm@5207
   544
'Delsimprocs [unit_eq_proc];' as last resort); also note that
wenzelm@5207
   545
unit_abs_eta_conv is added in order to counter the effect of
wenzelm@5207
   546
unit_eq_proc on (%u::unit. f u), replacing it by f rather than by
wenzelm@5207
   547
%u.f();
wenzelm@5125
   548
wenzelm@5217
   549
* HOL/Fun INCOMPATIBILITY: `inj_onto' is now called `inj_on' (which
wenzelm@5217
   550
makes more sense);
berghofe@5109
   551
paulson@5475
   552
* HOL/Set INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
   553
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
   554
  disjointness reasoning but breaking a few old proofs.
paulson@5267
   555
wenzelm@5217
   556
* HOL/Relation INCOMPATIBILITY: renamed the relational operator r^-1
wenzelm@5217
   557
to 'converse' from 'inverse' (for compatibility with ZF and some
wenzelm@5217
   558
literature);
wenzelm@5085
   559
wenzelm@5127
   560
* HOL/recdef can now declare non-recursive functions, with {} supplied as
wenzelm@5127
   561
the well-founded relation;
oheimb@4838
   562
paulson@5490
   563
* HOL/Set INCOMPATIBILITY: the complement of set A is now written -A instead of
paulson@5490
   564
    Compl A.  The "Compl" syntax remains available as input syntax for this
paulson@5490
   565
    release ONLY.
paulson@5490
   566
wenzelm@5127
   567
* HOL/Update: new theory of function updates:
wenzelm@5127
   568
    f(a:=b) == %x. if x=a then b else f x
wenzelm@5127
   569
may also be iterated as in f(a:=b,c:=d,...);
nipkow@5077
   570
wenzelm@5127
   571
* HOL/Vimage: new theory for inverse image of a function, syntax f-``B;
paulson@4899
   572
nipkow@5282
   573
* HOL/List:
nipkow@5282
   574
  - new function list_update written xs[i:=v] that updates the i-th
nipkow@5282
   575
    list position. May also be iterated as in xs[i:=a,j:=b,...].
nipkow@5428
   576
  - new function `upt' written [i..j(] which generates the list
nipkow@5428
   577
    [i,i+1,...,j-1], i.e. the upper bound is excluded. To include the upper
nipkow@5428
   578
    bound write [i..j], which is a shorthand for [i..j+1(].
nipkow@5282
   579
  - new lexicographic orderings and corresponding wellfoundedness theorems.
paulson@4779
   580
wenzelm@5127
   581
* HOL/Arith:
wenzelm@5127
   582
  - removed 'pred' (predecessor) function;
wenzelm@5127
   583
  - generalized some theorems about n-1;
wenzelm@5127
   584
  - many new laws about "div" and "mod";
wenzelm@5127
   585
  - new laws about greatest common divisors (see theory ex/Primes);
oheimb@4766
   586
wenzelm@5127
   587
* HOL/Relation: renamed the relational operator r^-1 "converse"
wenzelm@4842
   588
instead of "inverse";
wenzelm@4711
   589
nipkow@5651
   590
* HOL/Induct/Multiset: a theory of multisets, including the wellfoundedness
nipkow@5651
   591
  of the multiset ordering;
nipkow@5651
   592
wenzelm@5127
   593
* directory HOL/Real: a construction of the reals using Dedekind cuts
nipkow@5651
   594
  (not included by default);
nipkow@4835
   595
wenzelm@5127
   596
* directory HOL/UNITY: Chandy and Misra's UNITY formalism;
wenzelm@4711
   597
nipkow@5651
   598
* directory HOL/Hoare: a new version of Hoare logic which permits many-sorted
nipkow@5651
   599
  programs, i.e. different program variables may have different types.
nipkow@5651
   600
paulson@5142
   601
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
   602
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
   603
  Now rew can involve either definitions or equalities (either == or =).
wenzelm@5002
   604
wenzelm@5363
   605
paulson@4879
   606
*** ZF ***
paulson@4879
   607
paulson@5332
   608
* theory Main includes everything; INCOMPATIBILITY: theory ZF.thy contains
paulson@5332
   609
  only the theorems proved on ZF.ML;
paulson@5160
   610
paulson@5475
   611
* ZF INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
   612
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
   613
  disjointness reasoning but breaking a few old proofs.
paulson@5267
   614
paulson@5160
   615
* ZF/Update: new theory of function updates
paulson@5160
   616
    with default rewrite rule  f(x:=y) ` z = if(z=x, y, f`z)
paulson@5160
   617
  may also be iterated as in f(a:=b,c:=d,...);
paulson@5160
   618
paulson@4879
   619
* in  let x=t in u(x), neither t nor u(x) has to be an FOL term.
oheimb@4649
   620
paulson@5142
   621
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
   622
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
   623
  Now rew can involve either definitions or equalities (either == or =).
paulson@5142
   624
paulson@5160
   625
* case_tac provided for compatibility with HOL
paulson@5160
   626
    (like the old excluded_middle_tac, but with subgoals swapped)
paulson@5160
   627
wenzelm@4842
   628
wenzelm@5127
   629
*** Internal programming interfaces ***
wenzelm@5002
   630
wenzelm@5251
   631
* Pure: several new basic modules made available for general use, see
wenzelm@5251
   632
also src/Pure/README;
wenzelm@5207
   633
wenzelm@5008
   634
* improved the theory data mechanism to support encapsulation (data
wenzelm@5008
   635
kind name replaced by private Object.kind, acting as authorization
wenzelm@5373
   636
key); new type-safe user interface via functor TheoryDataFun; generic
wenzelm@5373
   637
print_data function becomes basically useless;
wenzelm@5002
   638
wenzelm@5251
   639
* removed global_names compatibility flag -- all theory declarations
wenzelm@5251
   640
are qualified by default;
wenzelm@5251
   641
wenzelm@5085
   642
* module Pure/Syntax now offers quote / antiquote translation
wenzelm@5085
   643
functions (useful for Hoare logic etc. with implicit dependencies);
wenzelm@5373
   644
see HOL/ex/Antiquote for an example use;
wenzelm@5085
   645
wenzelm@5127
   646
* Simplifier now offers conversions (asm_)(full_)rewrite: simpset ->
wenzelm@5127
   647
cterm -> thm;
wenzelm@5127
   648
wenzelm@5207
   649
* new tactical CHANGED_GOAL for checking that a tactic modifies a
wenzelm@5207
   650
subgoal;
paulson@5142
   651
wenzelm@5251
   652
* Display.print_goals function moved to Locale.print_goals;
wenzelm@5251
   653
wenzelm@5731
   654
* standard print function for goals supports current_goals_markers
wenzelm@5731
   655
variable for marking begin of proof, end of proof, start of goal; the
wenzelm@5731
   656
default is ("", "", ""); setting current_goals_markers := ("<proof>",
wenzelm@5731
   657
"</proof>", "<goal>") causes SGML like tagged proof state printing,
wenzelm@5731
   658
for example;
wenzelm@5731
   659
wenzelm@5002
   660
wenzelm@5002
   661
wenzelm@4410
   662
New in Isabelle98 (January 1998)
wenzelm@4410
   663
--------------------------------
wenzelm@4410
   664
wenzelm@4410
   665
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4410
   666
wenzelm@4410
   667
* changed lexical syntax of terms / types: dots made part of long
wenzelm@4410
   668
identifiers, e.g. "%x.x" no longer possible, should be "%x. x";
wenzelm@4410
   669
wenzelm@4410
   670
* simpset (and claset) reference variable replaced by functions
wenzelm@4410
   671
simpset / simpset_ref;
wenzelm@4410
   672
wenzelm@4410
   673
* no longer supports theory aliases (via merge) and non-trivial
wenzelm@4410
   674
implicit merge of thms' signatures;
wenzelm@4410
   675
wenzelm@4410
   676
* most internal names of constants changed due to qualified names;
wenzelm@4410
   677
wenzelm@4410
   678
* changed Pure/Sequence interface (see Pure/seq.ML);
wenzelm@4410
   679
wenzelm@3454
   680
paulson@3715
   681
*** General Changes ***
paulson@3715
   682
wenzelm@4174
   683
* hierachically structured name spaces (for consts, types, axms, thms
wenzelm@3943
   684
etc.); new lexical class 'longid' (e.g. Foo.bar.x) may render much of
wenzelm@4108
   685
old input syntactically incorrect (e.g. "%x.x"); COMPATIBILITY:
wenzelm@4108
   686
isatool fixdots ensures space after dots (e.g. "%x. x"); set
wenzelm@4174
   687
long_names for fully qualified output names; NOTE: ML programs
wenzelm@4174
   688
(special tactics, packages etc.) referring to internal names may have
wenzelm@4174
   689
to be adapted to cope with fully qualified names; in case of severe
wenzelm@4174
   690
backward campatibility problems try setting 'global_names' at compile
wenzelm@4174
   691
time to have enrything declared within a flat name space; one may also
wenzelm@4174
   692
fine tune name declarations in theories via the 'global' and 'local'
wenzelm@4174
   693
section;
wenzelm@4108
   694
wenzelm@4108
   695
* reimplemented the implicit simpset and claset using the new anytype
wenzelm@4108
   696
data filed in signatures; references simpset:simpset ref etc. are
wenzelm@4108
   697
replaced by functions simpset:unit->simpset and
wenzelm@4108
   698
simpset_ref:unit->simpset ref; COMPATIBILITY: use isatool fixclasimp
wenzelm@4108
   699
to patch your ML files accordingly;
paulson@3856
   700
wenzelm@3857
   701
* HTML output now includes theory graph data for display with Java
wenzelm@3857
   702
applet or isatool browser; data generated automatically via isatool
wenzelm@3901
   703
usedir (see -i option, ISABELLE_USEDIR_OPTIONS);
wenzelm@3857
   704
paulson@3856
   705
* defs may now be conditional; improved rewrite_goals_tac to handle
paulson@3856
   706
conditional equations;
paulson@3856
   707
wenzelm@4174
   708
* defs now admits additional type arguments, using TYPE('a) syntax;
wenzelm@4174
   709
wenzelm@3901
   710
* theory aliases via merge (e.g. M=A+B+C) no longer supported, always
wenzelm@3901
   711
creates a new theory node; implicit merge of thms' signatures is
wenzelm@4112
   712
restricted to 'trivial' ones; COMPATIBILITY: one may have to use
wenzelm@3901
   713
transfer:theory->thm->thm in (rare) cases;
wenzelm@3901
   714
wenzelm@3968
   715
* improved handling of draft signatures / theories; draft thms (and
wenzelm@3968
   716
ctyps, cterms) are automatically promoted to real ones;
wenzelm@3968
   717
wenzelm@3901
   718
* slightly changed interfaces for oracles: admit many per theory, named
wenzelm@3901
   719
(e.g. oracle foo = mlfun), additional name argument for invoke_oracle;
wenzelm@3901
   720
wenzelm@3901
   721
* print_goals: optional output of const types (set show_consts and
wenzelm@3901
   722
show_types);
wenzelm@3851
   723
wenzelm@4388
   724
* improved output of warnings (###) and errors (***);
wenzelm@3697
   725
paulson@4178
   726
* subgoal_tac displays a warning if the new subgoal has type variables;
paulson@4178
   727
paulson@3715
   728
* removed old README and Makefiles;
wenzelm@3697
   729
paulson@3856
   730
* replaced print_goals_ref hook by print_current_goals_fn and result_error_fn;
wenzelm@3670
   731
paulson@3715
   732
* removed obsolete init_pps and init_database;
paulson@3715
   733
paulson@3715
   734
* deleted the obsolete tactical STATE, which was declared by
paulson@3715
   735
    fun STATE tacfun st = tacfun st st;
paulson@3715
   736
wenzelm@4388
   737
* cd and use now support path variables, e.g. $ISABELLE_HOME, or ~
wenzelm@4388
   738
(which abbreviates $HOME);
wenzelm@4269
   739
wenzelm@4269
   740
* changed Pure/Sequence interface (see Pure/seq.ML); COMPATIBILITY:
wenzelm@4269
   741
use isatool fixseq to adapt your ML programs (this works for fully
wenzelm@4269
   742
qualified references to the Sequence structure only!);
wenzelm@4269
   743
wenzelm@4381
   744
* use_thy no longer requires writable current directory; it always
wenzelm@4381
   745
reloads .ML *and* .thy file, if either one is out of date;
wenzelm@4269
   746
paulson@3715
   747
paulson@3715
   748
*** Classical Reasoner ***
paulson@3715
   749
wenzelm@3744
   750
* Clarify_tac, clarify_tac, clarify_step_tac, Clarify_step_tac: new
wenzelm@3744
   751
tactics that use classical reasoning to simplify a subgoal without
wenzelm@3744
   752
splitting it into several subgoals;
paulson@3715
   753
paulson@3719
   754
* Safe_tac: like safe_tac but uses the default claset;
paulson@3719
   755
paulson@3715
   756
paulson@3715
   757
*** Simplifier ***
paulson@3715
   758
paulson@3715
   759
* added simplification meta rules:
paulson@3715
   760
    (asm_)(full_)simplify: simpset -> thm -> thm;
paulson@3715
   761
paulson@3715
   762
* simplifier.ML no longer part of Pure -- has to be loaded by object
paulson@3715
   763
logics (again);
paulson@3715
   764
paulson@3715
   765
* added prems argument to simplification procedures;
paulson@3715
   766
paulson@4325
   767
* HOL, FOL, ZF: added infix function `addsplits':
paulson@4325
   768
  instead of `<simpset> setloop (split_tac <thms>)'
paulson@4325
   769
  you can simply write `<simpset> addsplits <thms>'
paulson@4325
   770
paulson@3715
   771
paulson@3715
   772
*** Syntax ***
paulson@3715
   773
wenzelm@4174
   774
* TYPE('a) syntax for type reflection terms;
wenzelm@4174
   775
wenzelm@3985
   776
* no longer handles consts with name "" -- declare as 'syntax' instead;
paulson@3856
   777
paulson@3856
   778
* pretty printer: changed order of mixfix annotation preference (again!);
wenzelm@3846
   779
paulson@3715
   780
* Pure: fixed idt/idts vs. pttrn/pttrns syntactic categories;
paulson@3715
   781
paulson@3715
   782
paulson@3715
   783
*** HOL ***
paulson@3715
   784
wenzelm@5726
   785
* HOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
   786
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
   787
nipkow@4035
   788
* HOL/TLA: Stephan Merz's formalization of Lamport's Temporal Logic of Actions;
wenzelm@3985
   789
wenzelm@3985
   790
* HOL/Auth: new protocol proofs including some for the Internet
nipkow@4035
   791
  protocol TLS;
wenzelm@3985
   792
wenzelm@4125
   793
* HOL/Map: new theory of `maps' a la VDM;
nipkow@3982
   794
wenzelm@4335
   795
* HOL/simplifier: simplification procedures nat_cancel_sums for
wenzelm@4335
   796
cancelling out common nat summands from =, <, <= (in)equalities, or
wenzelm@4335
   797
differences; simplification procedures nat_cancel_factor for
wenzelm@4335
   798
cancelling common factor from =, <, <= (in)equalities over natural
wenzelm@4373
   799
sums; nat_cancel contains both kinds of procedures, it is installed by
wenzelm@4373
   800
default in Arith.thy -- this COULD MAKE EXISTING PROOFS FAIL;
wenzelm@4335
   801
nipkow@3580
   802
* HOL/simplifier: terms of the form
paulson@4325
   803
  `? x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x)'  (or t=x)
nipkow@3580
   804
  are rewritten to
nipkow@4035
   805
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t)',
nipkow@4035
   806
  and those of the form
paulson@4325
   807
  `! x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x) --> R(x)'  (or t=x)
nipkow@4035
   808
  are rewritten to
nipkow@4035
   809
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t) --> R(t)',
nipkow@4035
   810
nipkow@4035
   811
* HOL/datatype
nipkow@4035
   812
  Each datatype `t' now comes with a theorem `split_t_case' of the form
nipkow@3580
   813
nipkow@4035
   814
  P(t_case f1 ... fn x) =
nipkow@4035
   815
     ( (!y1 ... ym1. x = C1 y1 ... ym1 --> P(f1 y1 ... ym1)) &
nipkow@4035
   816
        ...
oheimb@4189
   817
       (!y1 ... ymn. x = Cn y1 ... ymn --> P(f1 y1 ... ymn))
nipkow@4035
   818
     )
nipkow@4035
   819
oheimb@4930
   820
  and a theorem `split_t_case_asm' of the form
oheimb@4189
   821
oheimb@4189
   822
  P(t_case f1 ... fn x) =
oheimb@4189
   823
    ~( (? y1 ... ym1. x = C1 y1 ... ym1 & ~P(f1 y1 ... ym1)) |
oheimb@4189
   824
        ...
oheimb@4189
   825
       (? y1 ... ymn. x = Cn y1 ... ymn & ~P(f1 y1 ... ymn))
oheimb@4189
   826
     )
oheimb@4930
   827
  which can be added to a simpset via `addsplits'. The existing theorems
oheimb@4930
   828
  expand_list_case and expand_option_case have been renamed to
oheimb@4930
   829
  split_list_case and split_option_case.
oheimb@4189
   830
nipkow@4361
   831
* HOL/Arithmetic:
nipkow@4361
   832
  - `pred n' is automatically converted to `n-1'.
nipkow@4361
   833
    Users are strongly encouraged not to use `pred' any longer,
nipkow@4361
   834
    because it will disappear altogether at some point.
nipkow@4361
   835
  - Users are strongly encouraged to write "0 < n" rather than
nipkow@4361
   836
    "n ~= 0". Theorems and proof tools have been modified towards this
nipkow@4361
   837
    `standard'.
nipkow@4357
   838
nipkow@4502
   839
* HOL/Lists:
nipkow@4502
   840
  the function "set_of_list" has been renamed "set" (and its theorems too);
nipkow@4502
   841
  the function "nth" now takes its arguments in the reverse order and
nipkow@4502
   842
  has acquired the infix notation "!" as in "xs!n".
paulson@3570
   843
paulson@4154
   844
* HOL/Set: UNIV is now a constant and is no longer translated to Compl{};
paulson@4154
   845
paulson@4154
   846
* HOL/Set: The operator (UN x.B x) now abbreviates (UN x:UNIV. B x) and its
paulson@4154
   847
  specialist theorems (like UN1_I) are gone.  Similarly for (INT x.B x);
paulson@4154
   848
wenzelm@4575
   849
* HOL/record: extensible records with schematic structural subtyping
wenzelm@4575
   850
(single inheritance); EXPERIMENTAL version demonstrating the encoding,
wenzelm@4575
   851
still lacks various theorems and concrete record syntax;
wenzelm@4575
   852
wenzelm@4125
   853
paulson@3715
   854
*** HOLCF ***
wenzelm@3535
   855
wenzelm@4125
   856
* removed "axioms" and "generated by" sections;
wenzelm@4125
   857
oheimb@4123
   858
* replaced "ops" section by extended "consts" section, which is capable of
wenzelm@4125
   859
  handling the continuous function space "->" directly;
wenzelm@4125
   860
wenzelm@4125
   861
* domain package:
wenzelm@4125
   862
  . proves theorems immediately and stores them in the theory,
wenzelm@4125
   863
  . creates hierachical name space,
wenzelm@4125
   864
  . now uses normal mixfix annotations (instead of cinfix...),
wenzelm@4125
   865
  . minor changes to some names and values (for consistency),
wenzelm@4125
   866
  . e.g. cases -> casedist, dists_eq -> dist_eqs, [take_lemma] -> take_lemmas,
wenzelm@4125
   867
  . separator between mutual domain defs: changed "," to "and",
wenzelm@4125
   868
  . improved handling of sort constraints;  now they have to
wenzelm@4125
   869
    appear on the left-hand side of the equations only;
oheimb@4123
   870
oheimb@4123
   871
* fixed LAM <x,y,zs>.b syntax;
wenzelm@3567
   872
wenzelm@3744
   873
* added extended adm_tac to simplifier in HOLCF -- can now discharge
wenzelm@3744
   874
adm (%x. P (t x)), where P is chainfinite and t continuous;
wenzelm@3579
   875
wenzelm@3579
   876
paulson@3719
   877
*** FOL and ZF ***
paulson@3719
   878
wenzelm@5726
   879
* FOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
   880
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
   881
wenzelm@3744
   882
* qed_spec_mp, qed_goal_spec_mp, qed_goalw_spec_mp are available, as
wenzelm@3744
   883
in HOL, they strip ALL and --> from proved theorems;
wenzelm@3744
   884
paulson@3719
   885
wenzelm@3579
   886
wenzelm@3006
   887
New in Isabelle94-8 (May 1997)
wenzelm@3006
   888
------------------------------
wenzelm@2654
   889
paulson@3002
   890
*** General Changes ***
paulson@3002
   891
paulson@3002
   892
* new utilities to build / run / maintain Isabelle etc. (in parts
paulson@3002
   893
still somewhat experimental); old Makefiles etc. still functional;
wenzelm@2971
   894
wenzelm@3205
   895
* new 'Isabelle System Manual';
wenzelm@3205
   896
wenzelm@2825
   897
* INSTALL text, together with ./configure and ./build scripts;
wenzelm@2773
   898
wenzelm@3006
   899
* reimplemented type inference for greater efficiency, better error
wenzelm@3006
   900
messages and clean internal interface;
paulson@3002
   901
paulson@3002
   902
* prlim command for dealing with lots of subgoals (an easier way of
paulson@3002
   903
setting goals_limit);
paulson@3002
   904
wenzelm@3006
   905
wenzelm@3006
   906
*** Syntax ***
paulson@3002
   907
wenzelm@3116
   908
* supports alternative (named) syntax tables (parser and pretty
wenzelm@3116
   909
printer); internal interface is provided by add_modesyntax(_i);
wenzelm@3116
   910
paulson@3002
   911
* Pure, FOL, ZF, HOL, HOLCF now support symbolic input and output; to
paulson@3002
   912
be used in conjunction with the Isabelle symbol font; uses the
paulson@3002
   913
"symbols" syntax table;
paulson@3002
   914
wenzelm@2705
   915
* added token_translation interface (may translate name tokens in
wenzelm@2756
   916
arbitrary ways, dependent on their type (free, bound, tfree, ...) and
wenzelm@3116
   917
the current print_mode); IMPORTANT: user print translation functions
wenzelm@3116
   918
are responsible for marking newly introduced bounds
wenzelm@3116
   919
(Syntax.mark_boundT);
wenzelm@2705
   920
wenzelm@2730
   921
* token translations for modes "xterm" and "xterm_color" that display
wenzelm@3006
   922
names in bold, underline etc. or colors (which requires a color
wenzelm@3006
   923
version of xterm);
wenzelm@2730
   924
paulson@3002
   925
* infixes may now be declared with names independent of their syntax;
paulson@3002
   926
paulson@3002
   927
* added typed_print_translation (like print_translation, but may
paulson@3002
   928
access type of constant);
paulson@3002
   929
wenzelm@3006
   930
paulson@3002
   931
*** Classical Reasoner ***
paulson@3002
   932
paulson@3002
   933
Blast_tac: a new tactic!  It is often more powerful than fast_tac, but has
paulson@3002
   934
some limitations.  Blast_tac...
paulson@3002
   935
  + ignores addss, addbefore, addafter; this restriction is intrinsic
paulson@3002
   936
  + ignores elimination rules that don't have the correct format
wenzelm@5726
   937
        (the conclusion MUST be a formula variable)
paulson@3002
   938
  + ignores types, which can make HOL proofs fail
paulson@3002
   939
  + rules must not require higher-order unification, e.g. apply_type in ZF
paulson@3002
   940
    [message "Function Var's argument not a bound variable" relates to this]
paulson@3002
   941
  + its proof strategy is more general but can actually be slower
paulson@3002
   942
wenzelm@3107
   943
* substitution with equality assumptions no longer permutes other
wenzelm@3107
   944
assumptions;
paulson@3002
   945
paulson@3002
   946
* minor changes in semantics of addafter (now called addaltern); renamed
paulson@3002
   947
setwrapper to setWrapper and compwrapper to compWrapper; added safe wrapper
wenzelm@3107
   948
(and access functions for it);
paulson@3002
   949
wenzelm@5726
   950
* improved combination of classical reasoner and simplifier:
oheimb@3317
   951
  + functions for handling clasimpsets
oheimb@3317
   952
  + improvement of addss: now the simplifier is called _after_ the
oheimb@3317
   953
    safe steps.
oheimb@3317
   954
  + safe variant of addss called addSss: uses safe simplifications
wenzelm@5726
   955
    _during_ the safe steps. It is more complete as it allows multiple
oheimb@3317
   956
    instantiations of unknowns (e.g. with slow_tac).
wenzelm@3006
   957
paulson@3002
   958
*** Simplifier ***
paulson@3002
   959
wenzelm@3006
   960
* added interface for simplification procedures (functions that
wenzelm@3006
   961
produce *proven* rewrite rules on the fly, depending on current
wenzelm@3006
   962
redex);
wenzelm@3006
   963
wenzelm@3006
   964
* ordering on terms as parameter (used for ordered rewriting);
wenzelm@3006
   965
wenzelm@3107
   966
* new functions delcongs, deleqcongs, and Delcongs. richer rep_ss;
paulson@3002
   967
paulson@3002
   968
* the solver is now split into a safe and an unsafe part.
paulson@3002
   969
This should be invisible for the normal user, except that the
paulson@3002
   970
functions setsolver and addsolver have been renamed to setSolver and
wenzelm@3107
   971
addSolver; added safe_asm_full_simp_tac;
paulson@3002
   972
paulson@3002
   973
paulson@3002
   974
*** HOL ***
paulson@3002
   975
nipkow@3042
   976
* a generic induction tactic `induct_tac' which works for all datatypes and
wenzelm@3107
   977
also for type `nat';
nipkow@3042
   978
nipkow@3316
   979
* a generic case distinction tactic `exhaust_tac' which works for all
nipkow@3316
   980
datatypes and also for type `nat';
nipkow@3316
   981
nipkow@3316
   982
* each datatype comes with a function `size';
nipkow@3316
   983
paulson@3002
   984
* patterns in case expressions allow tuple patterns as arguments to
wenzelm@3107
   985
constructors, for example `case x of [] => ... | (x,y,z)#ps => ...';
paulson@3002
   986
paulson@3002
   987
* primrec now also works with type nat;
paulson@3002
   988
paulson@3338
   989
* recdef: a new declaration form, allows general recursive functions to be
paulson@3338
   990
defined in theory files.  See HOL/ex/Fib, HOL/ex/Primes, HOL/Subst/Unify.
paulson@3338
   991
paulson@3002
   992
* the constant for negation has been renamed from "not" to "Not" to
wenzelm@3107
   993
harmonize with FOL, ZF, LK, etc.;
paulson@3002
   994
wenzelm@3107
   995
* HOL/ex/LFilter theory of a corecursive "filter" functional for
wenzelm@3107
   996
infinite lists;
paulson@3002
   997
wenzelm@3227
   998
* HOL/Modelcheck demonstrates invocation of model checker oracle;
wenzelm@3227
   999
paulson@3002
  1000
* HOL/ex/Ring.thy declares cring_simp, which solves equational
paulson@3002
  1001
problems in commutative rings, using axiomatic type classes for + and *;
paulson@3002
  1002
paulson@3002
  1003
* more examples in HOL/MiniML and HOL/Auth;
paulson@3002
  1004
paulson@3002
  1005
* more default rewrite rules for quantifiers, union/intersection;
paulson@3002
  1006
nipkow@3321
  1007
* a new constant `arbitrary == @x.False';
nipkow@3321
  1008
wenzelm@3107
  1009
* HOLCF/IOA replaces old HOL/IOA;
wenzelm@3107
  1010
wenzelm@5726
  1011
* HOLCF changes: derived all rules and arities
wenzelm@5726
  1012
  + axiomatic type classes instead of classes
slotosch@2653
  1013
  + typedef instead of faking type definitions
paulson@2747
  1014
  + eliminated the internal constants less_fun, less_cfun, UU_fun, UU_cfun etc.
wenzelm@2730
  1015
  + new axclasses cpo, chfin, flat with flat < chfin < pcpo < cpo < po
slotosch@2653
  1016
  + eliminated the types void, one, tr
slotosch@2653
  1017
  + use unit lift and bool lift (with translations) instead of one and tr
slotosch@2653
  1018
  + eliminated blift from Lift3.thy (use Def instead of blift)
wenzelm@3107
  1019
  all eliminated rules are derived as theorems --> no visible changes ;
oheimb@2649
  1020
wenzelm@3006
  1021
paulson@3002
  1022
*** ZF ***
wenzelm@2553
  1023
paulson@2865
  1024
* ZF now has Fast_tac, Simp_tac and Auto_tac.  Union_iff is a now a default
paulson@2865
  1025
rewrite rule; this may affect some proofs.  eq_cs is gone but can be put back
paulson@2865
  1026
as ZF_cs addSIs [equalityI];
wenzelm@2553
  1027
wenzelm@2554
  1028
wenzelm@2732
  1029
wenzelm@2553
  1030
New in Isabelle94-7 (November 96)
wenzelm@2553
  1031
---------------------------------
wenzelm@2553
  1032
wenzelm@2553
  1033
* allowing negative levels (as offsets) in prlev and choplev;
wenzelm@2553
  1034
wenzelm@2554
  1035
* super-linear speedup for large simplifications;
wenzelm@2554
  1036
wenzelm@2554
  1037
* FOL, ZF and HOL now use miniscoping: rewriting pushes
wenzelm@2554
  1038
quantifications in as far as possible (COULD MAKE EXISTING PROOFS
wenzelm@2554
  1039
FAIL); can suppress it using the command Delsimps (ex_simps @
wenzelm@2554
  1040
all_simps); De Morgan laws are also now included, by default;
wenzelm@2554
  1041
wenzelm@2554
  1042
* improved printing of ==>  :  ~:
wenzelm@2554
  1043
wenzelm@2554
  1044
* new object-logic "Sequents" adds linear logic, while replacing LK
wenzelm@2554
  1045
and Modal (thanks to Sara Kalvala);
wenzelm@2554
  1046
wenzelm@2554
  1047
* HOL/Auth: correctness proofs for authentication protocols;
wenzelm@2554
  1048
wenzelm@2554
  1049
* HOL: new auto_tac combines rewriting and classical reasoning (many
wenzelm@2554
  1050
examples on HOL/Auth);
wenzelm@2554
  1051
wenzelm@2554
  1052
* HOL: new command AddIffs for declaring theorems of the form P=Q to
wenzelm@2554
  1053
the rewriter and classical reasoner simultaneously;
wenzelm@2554
  1054
wenzelm@2554
  1055
* function uresult no longer returns theorems in "standard" format;
wenzelm@2554
  1056
regain previous version by: val uresult = standard o uresult;
wenzelm@2554
  1057
wenzelm@2554
  1058
wenzelm@2554
  1059
wenzelm@2554
  1060
New in Isabelle94-6
wenzelm@2554
  1061
-------------------
wenzelm@2554
  1062
wenzelm@2554
  1063
* oracles -- these establish an interface between Isabelle and trusted
wenzelm@2554
  1064
external reasoners, which may deliver results as theorems;
wenzelm@2554
  1065
wenzelm@2554
  1066
* proof objects (in particular record all uses of oracles);
wenzelm@2554
  1067
wenzelm@2554
  1068
* Simp_tac, Fast_tac, etc. that refer to implicit simpset / claset;
wenzelm@2554
  1069
wenzelm@2554
  1070
* "constdefs" section in theory files;
wenzelm@2554
  1071
wenzelm@2554
  1072
* "primrec" section (HOL) no longer requires names;
wenzelm@2554
  1073
wenzelm@2554
  1074
* internal type "tactic" now simply "thm -> thm Sequence.seq";
wenzelm@2554
  1075
wenzelm@2554
  1076
wenzelm@2554
  1077
wenzelm@2554
  1078
New in Isabelle94-5
wenzelm@2554
  1079
-------------------
wenzelm@2554
  1080
wenzelm@2554
  1081
* reduced space requirements;
wenzelm@2554
  1082
wenzelm@2554
  1083
* automatic HTML generation from theories;
wenzelm@2554
  1084
wenzelm@2554
  1085
* theory files no longer require "..." (quotes) around most types;
wenzelm@2554
  1086
wenzelm@2554
  1087
* new examples, including two proofs of the Church-Rosser theorem;
wenzelm@2554
  1088
wenzelm@2554
  1089
* non-curried (1994) version of HOL is no longer distributed;
wenzelm@2554
  1090
wenzelm@2553
  1091
paulson@2557
  1092
paulson@2557
  1093
New in Isabelle94-4
paulson@2557
  1094
-------------------
paulson@2557
  1095
paulson@2747
  1096
* greatly reduced space requirements;
paulson@2557
  1097
paulson@2557
  1098
* theory files (.thy) no longer require \...\ escapes at line breaks;
paulson@2557
  1099
wenzelm@5726
  1100
* searchable theorem database (see the section "Retrieving theorems" on
paulson@2557
  1101
page 8 of the Reference Manual);
paulson@2557
  1102
paulson@2557
  1103
* new examples, including Grabczewski's monumental case study of the
paulson@2557
  1104
Axiom of Choice;
paulson@2557
  1105
paulson@2557
  1106
* The previous version of HOL renamed to Old_HOL;
paulson@2557
  1107
wenzelm@5726
  1108
* The new version of HOL (previously called CHOL) uses a curried syntax
paulson@2557
  1109
for functions.  Application looks like f a b instead of f(a,b);
paulson@2557
  1110
paulson@2557
  1111
* Mutually recursive inductive definitions finally work in HOL;
paulson@2557
  1112
paulson@2557
  1113
* In ZF, pattern-matching on tuples is now available in all abstractions and
paulson@2557
  1114
translates to the operator "split";
paulson@2557
  1115
paulson@2557
  1116
paulson@2557
  1117
paulson@2557
  1118
New in Isabelle94-3
paulson@2557
  1119
-------------------
paulson@2557
  1120
wenzelm@5726
  1121
* new infix operator, addss, allowing the classical reasoner to
paulson@2557
  1122
perform simplification at each step of its search.  Example:
wenzelm@5726
  1123
        fast_tac (cs addss ss)
paulson@2557
  1124
wenzelm@5726
  1125
* a new logic, CHOL, the same as HOL, but with a curried syntax
wenzelm@5726
  1126
for functions.  Application looks like f a b instead of f(a,b).  Also pairs
paulson@2557
  1127
look like (a,b) instead of <a,b>;
paulson@2557
  1128
paulson@2557
  1129
* PLEASE NOTE: CHOL will eventually replace HOL!
paulson@2557
  1130
paulson@2557
  1131
* In CHOL, pattern-matching on tuples is now available in all abstractions.
paulson@2557
  1132
It translates to the operator "split".  A new theory of integers is available;
paulson@2557
  1133
paulson@2557
  1134
* In ZF, integer numerals now denote two's-complement binary integers.
paulson@2557
  1135
Arithmetic operations can be performed by rewriting.  See ZF/ex/Bin.ML;
paulson@2557
  1136
wenzelm@5726
  1137
* Many new examples: I/O automata, Church-Rosser theorem, equivalents
paulson@2557
  1138
of the Axiom of Choice;
paulson@2557
  1139
paulson@2557
  1140
paulson@2557
  1141
paulson@2557
  1142
New in Isabelle94-2
paulson@2557
  1143
-------------------
paulson@2557
  1144
wenzelm@5726
  1145
* Significantly faster resolution;
paulson@2557
  1146
paulson@2557
  1147
* the different sections in a .thy file can now be mixed and repeated
paulson@2557
  1148
freely;
paulson@2557
  1149
paulson@2557
  1150
* Database of theorems for FOL, HOL and ZF.  New
paulson@2557
  1151
commands including qed, qed_goal and bind_thm store theorems in the database.
paulson@2557
  1152
paulson@2557
  1153
* Simple database queries: return a named theorem (get_thm) or all theorems of
paulson@2557
  1154
a given theory (thms_of), or find out what theory a theorem was proved in
paulson@2557
  1155
(theory_of_thm);
paulson@2557
  1156
paulson@2557
  1157
* Bugs fixed in the inductive definition and datatype packages;
paulson@2557
  1158
paulson@2557
  1159
* The classical reasoner provides deepen_tac and depth_tac, making FOL_dup_cs
paulson@2557
  1160
and HOL_dup_cs obsolete;
paulson@2557
  1161
paulson@2557
  1162
* Syntactic ambiguities caused by the new treatment of syntax in Isabelle94-1
paulson@2557
  1163
have been removed;
paulson@2557
  1164
paulson@2557
  1165
* Simpler definition of function space in ZF;
paulson@2557
  1166
paulson@2557
  1167
* new results about cardinal and ordinal arithmetic in ZF;
paulson@2557
  1168
paulson@2557
  1169
* 'subtype' facility in HOL for introducing new types as subsets of existing
paulson@2557
  1170
types;
paulson@2557
  1171
paulson@2557
  1172
wenzelm@2553
  1173
$Id$