wenzelm@8729:
wenzelm@5363: Isabelle NEWS -- history user-relevant changes
wenzelm@5363: ==============================================
wenzelm@2553:
wenzelm@8015: New in this Isabelle version
wenzelm@8015: ----------------------------
wenzelm@8015:
paulson@8014: *** Overview of INCOMPATIBILITIES (see below for more details) ***
paulson@8014:
wenzelm@8848: * HOL: simplification of natural numbers is much changed; to partly
wenzelm@8848: recover the old behaviour (e.g. to prevent n+n rewriting to #2*n)
wenzelm@8848: issue the following ML commands:
wenzelm@8848:
wenzelm@8848: Delsimprocs Nat_Numeral_Simprocs.cancel_numerals;
wenzelm@8848: Delsimprocs [Nat_Numeral_Simprocs.combine_numerals];
paulson@8788:
paulson@8967: * HOL: 0 is now overloaded, so the type constraint ::nat may sometimes be
paulson@8967: needed;
paulson@8967:
wenzelm@8729: * HOL: the constant for f``x is now "image" rather than "op ``";
paulson@8014:
wenzelm@8729: * HOL: the cartesian product is now "<*>" instead of "Times"; the
wenzelm@8729: lexicographic product is now "<*lex*>" instead of "**";
nipkow@8705:
wenzelm@8518: * HOL: exhaust_tac on datatypes superceded by new generic case_tac;
wenzelm@8440:
nipkow@8603: * HOL: simplification no longer dives into case-expressions
nipkow@8603:
wenzelm@8655: * HOL: the recursion equations generated by 'recdef' are now called
wenzelm@8655: f.simps instead of f.rules;
nipkow@8626:
wenzelm@8848: * HOL: theory Sexp now in HOL/Induct examples (used to be part of main
wenzelm@8848: HOL, but was unused); should better use HOL's datatype package anyway;
wenzelm@8848:
wenzelm@8848: * HOL/Real: "rabs" replaced by overloaded "abs" function;
wenzelm@8848:
wenzelm@8887: * HOL/ML: even fewer consts are declared as global (see theories Ord,
wenzelm@8887: Lfp, Gfp, WF); this only affects ML packages that refer to const names
wenzelm@8887: internally;
wenzelm@8887:
wenzelm@8921: * Isar: changed syntax of local blocks from {{ }} to { };
wenzelm@8921:
wenzelm@8994: * ML: renamed flags Syntax.trace_norm_ast to Syntax.trace_ast; global
wenzelm@8994: timing flag supersedes proof_timing and Toplevel.trace;
wenzelm@8994:
wenzelm@8518: * ML: PureThy.add_thms/add_axioms/add_defs return theorems as well;
wenzelm@8440:
wenzelm@8729: * LaTeX: several improvements of isabelle.sty;
wenzelm@8729:
paulson@8014:
wenzelm@8487: *** Document preparation ***
wenzelm@8358:
wenzelm@8358: * isatool mkdir provides easy setup of Isabelle session directories,
wenzelm@8518: including proper document sources;
wenzelm@8358:
wenzelm@8358: * generated LaTeX sources are now deleted after successful run
wenzelm@8358: (isatool document -c); may retain a copy somewhere else via -D option
wenzelm@8358: of isatool usedir;
wenzelm@8358:
wenzelm@8566: * isatool usedir -D now lets isatool latex -o sty update the Isabelle
wenzelm@8566: style files, achieving self-contained LaTeX sources;
wenzelm@8566:
wenzelm@8518: * old-style theories now produce (crude) LaTeX output as well;
wenzelm@8358:
wenzelm@8358:
wenzelm@8184: *** Isar ***
wenzelm@8184:
wenzelm@8621: * Pure: local results and corresponding term bindings are now subject
wenzelm@8621: to Hindley-Milner polymorphism (similar to ML); this accommodates
wenzelm@8621: incremental type-inference nicely;
wenzelm@8283:
wenzelm@8621: * Pure: new 'obtain' language element supports generalized existence
wenzelm@8621: reasoning;
wenzelm@8621:
wenzelm@8621: * Pure: new calculational elements 'moreover' and 'ultimately' support
wenzelm@8621: plain accumulation of results, without applying any rules yet;
wenzelm@8184:
wenzelm@8487: * Pure: scalable support for case-analysis type proofs: new 'case'
wenzelm@8440: language element refers to local contexts symbolically, as produced by
wenzelm@8440: certain proof methods; internally, case names are attached to theorems
wenzelm@8440: as "tags";
wenzelm@8440:
wenzelm@8921: * Pure: changed syntax of local blocks from {{ }} to { };
wenzelm@8921:
wenzelm@8921: * Pure: syntax of sorts made inner, i.e. have to write "{a, b, c}"
wenzelm@8921: instead of {a, b, c};
wenzelm@8921:
wenzelm@8621: * Pure now provides its own version of intro/elim/dest attributes;
wenzelm@8621: useful for building new logics, but beware of confusion with the
wenzelm@8621: Provers/classical ones;
wenzelm@8621:
wenzelm@8991: * Pure: the local context of (non-atomic) goals is provided via case
wenzelm@8991: name 'antecedent';
wenzelm@8991:
wenzelm@9011: * Pure: removed obsolete 'transfer' attribute (transfer of thms to the
wenzelm@9011: current context is now done automatically);
wenzelm@9011:
wenzelm@8487: * Provers: splitter support (via 'split' attribute and 'simp' method
wenzelm@8487: modifier); 'simp' method: 'only:' modifier removes loopers as well
wenzelm@8487: (including splits);
wenzelm@8487:
wenzelm@8440: * HOL: new proof method 'cases' and improved version of 'induct' now
wenzelm@8440: support named cases; major packages (inductive, datatype, primrec,
wenzelm@8440: recdef) support case names and properly name parameters;
wenzelm@8440:
wenzelm@8440: * HOL: removed 'case_split' thm binding, should use 'cases' proof
wenzelm@8283: method anyway;
wenzelm@8283:
wenzelm@8440: * names of theorems etc. may be natural numbers as well;
wenzelm@8283:
wenzelm@8518: * Provers: intro/elim/dest attributes: changed ! / !! flags to ? / ??;
wenzelm@8283:
wenzelm@8887: * 'pr' command: optional goals_limit argument; no longer prints theory
wenzelm@8887: contexts, but only proof states;
wenzelm@8487:
wenzelm@8487: * diagnostic commands 'pr', 'thm', 'prop', 'term', 'typ' admit
wenzelm@8518: additional print modes to be specified; e.g. "pr(latex)" will print
wenzelm@8518: proof state according to the Isabelle LaTeX style;
wenzelm@8487:
wenzelm@8534: * improved support for emulating tactic scripts, including proof
wenzelm@8534: methods 'tactic', 'res_inst_tac' etc., 'subgoal_tac', and 'case_tac' /
wenzelm@8534: 'induct_tac' (for HOL datatypes);
wenzelm@8534:
wenzelm@8673: * simplified (more robust) goal selection of proof methods: 1st goal,
wenzelm@8673: all goals, or explicit goal specifier (tactic emulation); thus 'proof
wenzelm@8673: method scripts' have to be in depth-first order;
wenzelm@8673:
wenzelm@8673: * tuned 'let' syntax: replace 'as' keyword by 'and';
wenzelm@8534:
wenzelm@8729: * theory command 'hide' removes declarations from class/type/const
wenzelm@8729: name spaces;
wenzelm@8729:
wenzelm@8184:
paulson@8014: *** HOL ***
paulson@8014:
oheimb@9028: * HOL/Prolog: a (bare-bones) implementation of Lambda-Prolog
oheimb@9028:
wenzelm@8518: * HOL/Algebra: new theory of rings and univariate polynomials, by
wenzelm@8518: Clemens Ballarin;
paulson@8014:
wenzelm@8271: * HOL/record: fixed select-update simplification procedure to handle
wenzelm@8283: extended records as well; admit "r" as field name;
wenzelm@8271:
paulson@8392: * HOL/ex: new theory Factorization proving the Fundamental Theorem of
paulson@8392: Arithmetic, by Thomas M Rasmussen;
wenzelm@8007:
wenzelm@8570: * HOL/ex/Multiquote: multiple nested quotations and anti-quotations --
wenzelm@8570: basically a generalized version of de-Bruijn representation; very
wenzelm@8570: useful in avoiding lifting all operations;
wenzelm@8570:
wenzelm@8848: * HOL/Real: "rabs" replaced by overloaded "abs" function;
wenzelm@8848:
paulson@8967: * HOL: 0 is now overloaded over the new sort "zero", allowing its use with
paulson@8967: other numeric types and also as the identity of groups, rings, etc.;
paulson@8967:
paulson@8967: * HOL: new axclass plus_ac0 for addition with the AC-laws and 0 as identity.
paulson@8967: Types nat and int belong to this axclass;
paulson@8967:
paulson@8832: * greatly improved simplification involving numerals of type nat & int, e.g.
paulson@8788: (i + #8 + j) = Suc k simplifies to #7 + (i + j) = k
paulson@8832: i*j + k + j*#3*i simplifies to #4*(i*j) + k
paulson@8832: two terms #m*u and #n*u are replaced by #(m+n)*u
paulson@8832: (where #m, #n and u can implicitly be 1; this is simproc combine_numerals)
paulson@8832: and the term/formula #m*u+x ~~ #n*u+y simplifies simplifies to #(m-n)+x ~~ y
paulson@8832: or x ~~ #(n-m)+y, where ~~ is one of = < <= or - (simproc cancel_numerals);
paulson@8736:
wenzelm@8848: * HOL: new version of "case_tac" subsumes both boolean case split and
wenzelm@8440: "exhaust_tac" on datatypes; INCOMPATIBILITY: exhaust_tac no longer
wenzelm@8518: exists, may define val exhaust_tac = case_tac for ad-hoc portability;
wenzelm@8440:
wenzelm@8848: * HOL: simplification no longer dives into case-expressions: only the
wenzelm@8848: selector expression is simplified, but not the remaining arms. To
wenzelm@8848: enable full simplification of case-expressions for datatype t, you
wenzelm@8848: need to remove t.weak_case_cong from the simpset, either permanently
nipkow@8603: (Delcongs[thm"t.weak_case_cong"];) or locally (delcongs [...]).
nipkow@8603:
wenzelm@8848: * HOL/recdef: the recursion equations generated by 'recdef' for
wenzelm@8848: function 'f' are now called f.simps instead of f.rules; if all
wenzelm@8848: termination conditions are proved automatically, these simplification
wenzelm@8848: rules are added to the simpset, as in primrec; rules may be named
wenzelm@8848: individually as well, resulting in a separate list of theorems for
wenzelm@8848: each equation;
wenzelm@8848:
nipkow@8925: * HOL: new (overloaded) notation for the set of elements below/above some
nipkow@8925: element: {..u}, {..u(}, {l..}, {)l..}. See theory SetInterval.
nipkow@8925:
wenzelm@8848: * HOL: theorems impI, allI, ballI bound as "strip";
wenzelm@8848:
wenzelm@8848: * theory Sexp now in HOL/Induct examples (used to be part of main HOL,
wenzelm@8848: but was unused);
nipkow@8626:
wenzelm@8887: * fewer consts declared as global (e.g. have to refer to "Lfp.lfp"
wenzelm@8887: instead of "lfp" internally; affects ML packages only);
wenzelm@8887:
nipkow@8412:
wenzelm@8358: *** General ***
wenzelm@8358:
wenzelm@8729: * improved name spaces: ambiguous output is qualified; support for
wenzelm@8729: hiding of names;
wenzelm@8729:
wenzelm@8358: * compression of ML heaps images may now be controlled via -c option
wenzelm@8518: of isabelle and isatool usedir (currently only observed by Poly/ML);
wenzelm@8358:
wenzelm@8994: * ML: renamed flags Syntax.trace_norm_ast to Syntax.trace_ast; global
wenzelm@8994: timing flag supersedes proof_timing and Toplevel.trace;
wenzelm@8994:
wenzelm@8518: * ML: new combinators |>> and |>>> for incremental transformations
wenzelm@8518: with secondary results (e.g. certain theory extensions):
wenzelm@8440:
wenzelm@8358:
wenzelm@8015:
wenzelm@7986: New in Isabelle99 (October 1999)
wenzelm@7986: --------------------------------
oheimb@4649:
paulson@5931: *** Overview of INCOMPATIBILITIES (see below for more details) ***
paulson@5931:
paulson@6922: * HOL: The THEN and ELSE parts of conditional expressions (if P then x else y)
paulson@6922: are no longer simplified. (This allows the simplifier to unfold recursive
paulson@6922: functional programs.) To restore the old behaviour, declare
wenzelm@7215:
wenzelm@7215: Delcongs [if_weak_cong];
paulson@6922:
wenzelm@6269: * HOL: Removed the obsolete syntax "Compl A"; use -A for set
wenzelm@6269: complement;
paulson@5931:
wenzelm@6269: * HOL: the predicate "inj" is now defined by translation to "inj_on";
paulson@6174:
berghofe@7847: * HOL/datatype: mutual_induct_tac no longer exists --
berghofe@7847: use induct_tac "x_1 ... x_n" instead of mutual_induct_tac ["x_1", ..., "x_n"]
berghofe@7847:
wenzelm@6386: * HOL/typedef: fixed type inference for representing set; type
wenzelm@6386: arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386:
wenzelm@6269: * ZF: The con_defs part of an inductive definition may no longer refer
wenzelm@6269: to constants declared in the same theory;
nipkow@6057:
wenzelm@6269: * HOL, ZF: the function mk_cases, generated by the inductive
wenzelm@6269: definition package, has lost an argument. To simplify its result, it
wenzelm@6269: uses the default simpset instead of a supplied list of theorems.
paulson@6141:
wenzelm@7215: * HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215:
nipkow@7619: * Simplifier: the type of the infix ML functions
wenzelm@8729: setSSolver addSSolver setSolver addSolver
nipkow@7619: is now simpset * solver -> simpset where `solver' is a new abstract type
nipkow@7619: for packaging solvers. A solver is created via
wenzelm@8729: mk_solver: string -> (thm list -> int -> tactic) -> solver
nipkow@7619: where the string argument is only a comment.
nipkow@6057:
wenzelm@7647:
paulson@6069: *** Proof tools ***
paulson@6069:
wenzelm@6343: * Provers/Arith/fast_lin_arith.ML contains a functor for creating a
wenzelm@6343: decision procedure for linear arithmetic. Currently it is used for
wenzelm@7593: types `nat', `int', and `real' in HOL (see below); it can, should and
wenzelm@7593: will be instantiated for other types and logics as well.
paulson@6069:
nipkow@7324: * The simplifier now accepts rewrite rules with flexible heads, eg
nipkow@7324: hom ?f ==> ?f(?x+?y) = ?f ?x + ?f ?y
nipkow@7324: They are applied like any rule with a non-pattern lhs, i.e. by first-order
nipkow@7324: matching.
paulson@6069:
wenzelm@7593:
paulson@6014: *** General ***
paulson@6014:
wenzelm@7986: * New Isabelle/Isar subsystem provides an alternative to traditional
wenzelm@7215: tactical theorem proving; together with the ProofGeneral/isar user
wenzelm@7215: interface it offers an interactive environment for developing human
wenzelm@7215: readable proof documents (Isar == Intelligible semi-automated
wenzelm@7886: reasoning); for further information see isatool doc isar-ref,
wenzelm@7986: src/HOL/Isar_examples and http://isabelle.in.tum.de/Isar/
wenzelm@7886:
wenzelm@7886: * improved presentation of theories: better HTML markup (including
wenzelm@7886: colors), graph views in several sizes; isatool usedir now provides a
wenzelm@7886: proper interface for user theories (via -P option); actual document
wenzelm@7886: preparation based on (PDF)LaTeX is available as well (for new-style
wenzelm@7886: theories only); see isatool doc system for more information;
wenzelm@7215:
wenzelm@7252: * native support for Proof General, both for classic Isabelle and
wenzelm@7986: Isabelle/Isar;
wenzelm@7215:
wenzelm@7791: * ML function thm_deps visualizes dependencies of theorems and lemmas,
wenzelm@7791: using the graph browser tool;
wenzelm@7791:
wenzelm@6751: * Isabelle manuals now also available as PDF;
wenzelm@6751:
wenzelm@6449: * theory loader rewritten from scratch (may not be fully
wenzelm@6449: bug-compatible); old loadpath variable has been replaced by show_path,
wenzelm@6671: add_path, del_path, reset_path functions; new operations such as
wenzelm@7593: update_thy, touch_thy, remove_thy, use/update_thy_only (see also
wenzelm@7593: isatool doc ref);
wenzelm@6449:
wenzelm@7215: * improved isatool install: option -k creates KDE application icon,
wenzelm@7215: option -p DIR installs standalone binaries;
wenzelm@7215:
wenzelm@7215: * added ML_PLATFORM setting (useful for cross-platform installations);
wenzelm@7215: more robust handling of platform specific ML images for SML/NJ;
wenzelm@7215:
wenzelm@7886: * the settings environment is now statically scoped, i.e. it is never
wenzelm@7986: created again in sub-processes invoked from isabelle, isatool, or
wenzelm@7886: Isabelle;
wenzelm@7886:
wenzelm@7215: * path element specification '~~' refers to '$ISABELLE_HOME';
wenzelm@7215:
wenzelm@6343: * in locales, the "assumes" and "defines" parts may be omitted if
wenzelm@6343: empty;
wenzelm@5973:
wenzelm@6269: * new print_mode "xsymbols" for extended symbol support (e.g. genuine
wenzelm@6269: long arrows);
wenzelm@6259:
wenzelm@6343: * new print_mode "HTML";
wenzelm@6343:
wenzelm@6343: * new flag show_tags controls display of tags of theorems (which are
wenzelm@6343: basically just comments that may be attached by some tools);
wenzelm@6343:
wenzelm@6461: * Isamode 2.6 requires patch to accomodate change of Isabelle font
wenzelm@6461: mode and goal output format:
wenzelm@6461:
wenzelm@6461: diff -r Isamode-2.6/elisp/isa-load.el Isamode/elisp/isa-load.el
wenzelm@6461: 244c244
wenzelm@6461: < (list (isa-getenv "ISABELLE") "-msymbols" logic-name)
wenzelm@6461: ---
wenzelm@6533: > (list (isa-getenv "ISABELLE") "-misabelle_font" "-msymbols" logic-name)
wenzelm@6461: diff -r Isabelle-2.6/elisp/isa-proofstate.el Isamode/elisp/isa-proofstate.el
wenzelm@6461: 181c181
wenzelm@6461: < (defconst proofstate-proofstart-regexp "^Level [0-9]+$"
wenzelm@6461: ---
wenzelm@6461: > (defconst proofstate-proofstart-regexp "^Level [0-9]+"
wenzelm@6461:
wenzelm@7450: * function bind_thms stores lists of theorems (cf. bind_thm);
wenzelm@7450:
wenzelm@7593: * new shorthand tactics ftac, eatac, datac, fatac;
wenzelm@7593:
wenzelm@7593: * qed (and friends) now accept "" as result name; in that case the
wenzelm@7986: theorem is not stored, but proper checks and presentation of the
wenzelm@7986: result still apply;
wenzelm@7593:
wenzelm@7805: * theorem database now also indexes constants "Trueprop", "all",
wenzelm@7805: "==>", "=="; thus thms_containing, findI etc. may retrieve more rules;
wenzelm@7805:
oheimb@6028:
nipkow@6057: *** HOL ***
nipkow@6057:
wenzelm@7215: ** HOL arithmetic **
wenzelm@7215:
wenzelm@6343: * There are now decision procedures for linear arithmetic over nat and
wenzelm@6343: int:
nipkow@6131:
wenzelm@6343: 1. arith_tac copes with arbitrary formulae involving `=', `<', `<=',
wenzelm@6343: `+', `-', `Suc', `min', `max' and numerical constants; other subterms
wenzelm@6343: are treated as atomic; subformulae not involving type `nat' or `int'
wenzelm@6343: are ignored; quantified subformulae are ignored unless they are
wenzelm@6343: positive universal or negative existential. The tactic has to be
wenzelm@6343: invoked by hand and can be a little bit slow. In particular, the
wenzelm@6343: running time is exponential in the number of occurrences of `min' and
wenzelm@6343: `max', and `-' on `nat'.
nipkow@6131:
wenzelm@6343: 2. fast_arith_tac is a cut-down version of arith_tac: it only takes
wenzelm@6343: (negated) (in)equalities among the premises and the conclusion into
wenzelm@6343: account (i.e. no compound formulae) and does not know about `min' and
wenzelm@6343: `max', and `-' on `nat'. It is fast and is used automatically by the
wenzelm@6343: simplifier.
nipkow@6131:
wenzelm@6343: NB: At the moment, these decision procedures do not cope with mixed
wenzelm@6343: nat/int formulae where the two parts interact, such as `m < n ==>
wenzelm@6343: int(m) < int(n)'.
oheimb@6028:
wenzelm@7215: * HOL/Numeral provides a generic theory of numerals (encoded
wenzelm@7313: efficiently as bit strings); setup for types nat/int/real is in place;
wenzelm@7215: INCOMPATIBILITY: since numeral syntax is now polymorphic, rather than
wenzelm@7215: int, existing theories and proof scripts may require a few additional
wenzelm@7215: type constraints;
wenzelm@7215:
wenzelm@7215: * integer division and remainder can now be performed on constant
wenzelm@7215: arguments;
paulson@7157:
wenzelm@7215: * many properties of integer multiplication, division and remainder
wenzelm@7215: are now available;
paulson@6922:
paulson@7287: * An interface to the Stanford Validity Checker (SVC) is available through the
paulson@7287: tactic svc_tac. Propositional tautologies and theorems of linear arithmetic
paulson@7287: are proved automatically. SVC must be installed separately, and its results
paulson@7287: must be TAKEN ON TRUST (Isabelle does not check the proofs, but tags any
paulson@7287: invocation of the underlying oracle). For SVC see
paulson@7444: http://verify.stanford.edu/SVC
paulson@6922:
wenzelm@7125: * IsaMakefile: the HOL-Real target now builds an actual image;
wenzelm@7125:
wenzelm@7215:
wenzelm@7215: ** HOL misc **
wenzelm@7215:
wenzelm@7595: * HOL/Real/HahnBanach: the Hahn-Banach theorem for real vector spaces
wenzelm@7595: (in Isabelle/Isar) -- by Gertrud Bauer;
wenzelm@7595:
wenzelm@7691: * HOL/BCV: generic model of bytecode verification, i.e. data-flow
wenzelm@7691: analysis for assembly languages with subtypes;
wenzelm@7691:
wenzelm@6278: * HOL/TLA (Lamport's Temporal Logic of Actions): major reorganization
wenzelm@6278: -- avoids syntactic ambiguities and treats state, transition, and
wenzelm@6278: temporal levels more uniformly; introduces INCOMPATIBILITIES due to
wenzelm@6278: changed syntax and (many) tactics;
wenzelm@6278:
wenzelm@7791: * HOL/inductive: Now also handles more general introduction rules such
wenzelm@7791: as "ALL y. (y, x) : r --> y : acc r ==> x : acc r"; monotonicity
wenzelm@7791: theorems are now maintained within the theory (maintained via the
wenzelm@7791: "mono" attribute);
berghofe@7780:
wenzelm@7238: * HOL/datatype: Now also handles arbitrarily branching datatypes
wenzelm@7238: (using function types) such as
wenzelm@7238:
wenzelm@7238: datatype 'a tree = Atom 'a | Branch "nat => 'a tree"
berghofe@7047:
wenzelm@7326: * HOL/record: record_simproc (part of the default simpset) takes care
wenzelm@7326: of selectors applied to updated records; record_split_tac is no longer
wenzelm@7327: part of the default claset; update_defs may now be removed from the
wenzelm@7327: simpset in many cases; COMPATIBILITY: old behavior achieved by
wenzelm@7326:
wenzelm@7326: claset_ref () := claset() addSWrapper record_split_wrapper;
wenzelm@7326: Delsimprocs [record_simproc]
wenzelm@7326:
wenzelm@6386: * HOL/typedef: fixed type inference for representing set; type
wenzelm@6386: arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386:
paulson@7287: * HOL/recdef (TFL): 'congs' syntax now expects comma separated list of theorem
paulson@7287: names rather than an ML expression;
paulson@7287:
paulson@7287: * HOL/defer_recdef (TFL): like recdef but the well-founded relation can be
paulson@7287: supplied later. Program schemes can be defined, such as
paulson@7287: "While B C s = (if B s then While B C (C s) else s)"
paulson@7287: where the well-founded relation can be chosen after B and C have been given.
wenzelm@6563:
wenzelm@7215: * HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215: INCOMPATIBILITY: while [] and infix # syntax is still there, of
wenzelm@7215: course, ML tools referring to List.list.op # etc. have to be adapted;
wenzelm@7215:
wenzelm@7238: * HOL_quantifiers flag superseded by "HOL" print mode, which is
wenzelm@7238: disabled by default; run isabelle with option -m HOL to get back to
wenzelm@7238: the original Gordon/HOL-style output;
wenzelm@7238:
wenzelm@7238: * HOL/Ord.thy: new bounded quantifier syntax (input only): ALL x, <+>, <**>, <+> eliminated and made
wenzelm@7280: thus available for user theories;
wenzelm@7280:
wenzelm@7300: * HOLCF/IOA/Sequents: renamed 'Cons' to 'Consq' to avoid clash with
wenzelm@7300: HOL/List; hardly an INCOMPATIBILITY since '>>' syntax is used all the
wenzelm@7300: time;
wenzelm@7300:
wenzelm@7986: * HOL: new tactic smp_tac: int -> int -> tactic, which applies spec
wenzelm@7986: several times and then mp;
oheimb@7492:
wenzelm@7215:
paulson@7113: *** LK ***
paulson@7113:
wenzelm@7215: * the notation <<...>> is now available as a notation for sequences of
wenzelm@7215: formulas;
paulson@7113:
paulson@7113: * the simplifier is now installed
paulson@7113:
wenzelm@8729: * the axiom system has been generalized (thanks to Soren Heilmann)
paulson@7113:
paulson@7113: * the classical reasoner now has a default rule database
paulson@7113:
paulson@7113:
paulson@6064: *** ZF ***
paulson@6064:
paulson@6064: * new primrec section allows primitive recursive functions to be given
wenzelm@6269: directly (as in HOL) over datatypes and the natural numbers;
paulson@6064:
wenzelm@6269: * new tactics induct_tac and exhaust_tac for induction (or case
wenzelm@6269: analysis) over datatypes and the natural numbers;
paulson@6064:
paulson@6064: * the datatype declaration of type T now defines the recursor T_rec;
paulson@6064:
paulson@6141: * simplification automatically does freeness reasoning for datatype
wenzelm@6269: constructors;
paulson@6141:
wenzelm@6269: * automatic type-inference, with AddTCs command to insert new
wenzelm@6269: type-checking rules;
paulson@6155:
wenzelm@6269: * datatype introduction rules are now added as Safe Introduction rules
wenzelm@6269: to the claset;
paulson@6155:
wenzelm@6269: * the syntax "if P then x else y" is now available in addition to
wenzelm@6269: if(P,x,y);
wenzelm@6269:
paulson@6069:
wenzelm@6343: *** Internal programming interfaces ***
wenzelm@6343:
wenzelm@7919: * tuned simplifier trace output; new flag debug_simp;
wenzelm@7919:
wenzelm@7420: * structures Vartab / Termtab (instances of TableFun) offer efficient
wenzelm@7420: tables indexed by indexname_ord / term_ord (compatible with aconv);
wenzelm@7420:
wenzelm@6386: * AxClass.axclass_tac lost the theory argument;
wenzelm@6386:
wenzelm@6343: * tuned current_goals_markers semantics: begin / end goal avoids
wenzelm@6343: printing empty lines;
wenzelm@6343:
wenzelm@6343: * removed prs and prs_fn hook, which was broken because it did not
wenzelm@6343: include \n in its semantics, forcing writeln to add one
wenzelm@6343: uncoditionally; replaced prs_fn by writeln_fn; consider std_output:
wenzelm@6343: string -> unit if you really want to output text without newline;
wenzelm@6343:
wenzelm@6343: * Symbol.output subject to print mode; INCOMPATIBILITY: defaults to
wenzelm@6343: plain output, interface builders may have to enable 'isabelle_font'
wenzelm@6343: mode to get Isabelle font glyphs as before;
wenzelm@6343:
wenzelm@6343: * refined token_translation interface; INCOMPATIBILITY: output length
wenzelm@6343: now of type real instead of int;
wenzelm@6343:
wenzelm@7196: * theory loader actions may be traced via new ThyInfo.add_hook
wenzelm@7196: interface (see src/Pure/Thy/thy_info.ML); example application: keep
wenzelm@7196: your own database of information attached to *whole* theories -- as
wenzelm@7196: opposed to intra-theory data slots offered via TheoryDataFun;
wenzelm@7196:
wenzelm@7647: * proper handling of dangling sort hypotheses (at last!);
wenzelm@7647: Thm.strip_shyps and Drule.strip_shyps_warning take care of removing
wenzelm@7647: extra sort hypotheses that can be witnessed from the type signature;
wenzelm@7986: the force_strip_shyps flag is gone, any remaining shyps are simply
wenzelm@7986: left in the theorem (with a warning issued by strip_shyps_warning);
wenzelm@7647:
wenzelm@6343:
paulson@6064:
wenzelm@5781: New in Isabelle98-1 (October 1998)
wenzelm@5781: ----------------------------------
wenzelm@5781:
wenzelm@5127: *** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4842:
wenzelm@5726: * several changes of automated proof tools;
wenzelm@5373:
wenzelm@5726: * HOL: major changes to the inductive and datatype packages, including
wenzelm@5726: some minor incompatibilities of theory syntax;
berghofe@5214:
wenzelm@5726: * HOL: renamed r^-1 to 'converse' from 'inverse'; 'inj_onto' is now
wenzelm@5217: called `inj_on';
paulson@5160:
nipkow@5275: * HOL: removed duplicate thms in Arith:
nipkow@5275: less_imp_add_less should be replaced by trans_less_add1
nipkow@5275: le_imp_add_le should be replaced by trans_le_add1
paulson@5160:
wenzelm@5726: * HOL: unary minus is now overloaded (new type constraints may be
wenzelm@5726: required);
paulson@5490:
wenzelm@5726: * HOL and ZF: unary minus for integers is now #- instead of #~. In
wenzelm@5726: ZF, expressions such as n#-1 must be changed to n#- 1, since #-1 is
wenzelm@5726: now taken as an integer constant.
paulson@5541:
wenzelm@5726: * Pure: ML function 'theory_of' renamed to 'theory';
wenzelm@5397:
wenzelm@5363:
wenzelm@5127: *** Proof tools ***
nipkow@4880:
nipkow@5657: * Simplifier:
nipkow@5657: 1. Asm_full_simp_tac is now more aggressive.
nipkow@5657: 1. It will sometimes reorient premises if that increases their power to
nipkow@5657: simplify.
nipkow@5657: 2. It does no longer proceed strictly from left to right but may also
nipkow@5657: rotate premises to achieve further simplification.
nipkow@5657: For compatibility reasons there is now Asm_lr_simp_tac which is like the
nipkow@5657: old Asm_full_simp_tac in that it does not rotate premises.
nipkow@5657: 2. The simplifier now knows a little bit about nat-arithmetic.
nipkow@4880:
wenzelm@5127: * Classical reasoner: wrapper mechanism for the classical reasoner now
wenzelm@5127: allows for selected deletion of wrappers, by introduction of names for
wenzelm@5127: wrapper functionals. This implies that addbefore, addSbefore,
wenzelm@5127: addaltern, and addSaltern now take a pair (name, tactic) as argument,
wenzelm@5127: and that adding two tactics with the same name overwrites the first
wenzelm@5127: one (emitting a warning).
oheimb@4824: type wrapper = (int -> tactic) -> (int -> tactic)
oheimb@4649: setWrapper, setSWrapper, compWrapper and compSWrapper are replaced by
oheimb@4824: addWrapper, addSWrapper: claset * (string * wrapper) -> claset
oheimb@4824: delWrapper, delSWrapper: claset * string -> claset
oheimb@4649: getWrapper is renamed to appWrappers, getSWrapper to appSWrappers;
oheimb@4649:
wenzelm@5705: * Classical reasoner: addbefore/addSbefore now have APPEND/ORELSE
wenzelm@5726: semantics; addbefore now affects only the unsafe part of step_tac
wenzelm@5726: etc.; this affects addss/auto_tac/force_tac, so EXISTING PROOFS MAY
wenzelm@5726: FAIL, but proofs should be fixable easily, e.g. by replacing Auto_tac
wenzelm@5726: by Force_tac;
oheimb@5524:
wenzelm@5726: * Classical reasoner: setwrapper to setWrapper and compwrapper to
wenzelm@5726: compWrapper; added safe wrapper (and access functions for it);
oheimb@5524:
wenzelm@5127: * HOL/split_all_tac is now much faster and fails if there is nothing
wenzelm@5726: to split. Some EXISTING PROOFS MAY REQUIRE ADAPTION because the order
wenzelm@5726: and the names of the automatically generated variables have changed.
wenzelm@5726: split_all_tac has moved within claset() from unsafe wrappers to safe
wenzelm@5726: wrappers, which means that !!-bound variables are split much more
wenzelm@5726: aggressively, and safe_tac and clarify_tac now split such variables.
wenzelm@5726: If this splitting is not appropriate, use delSWrapper "split_all_tac".
wenzelm@5726: Note: the same holds for record_split_tac, which does the job of
wenzelm@5726: split_all_tac for record fields.
wenzelm@5127:
wenzelm@5726: * HOL/Simplifier: Rewrite rules for case distinctions can now be added
wenzelm@5726: permanently to the default simpset using Addsplits just like
wenzelm@5726: Addsimps. They can be removed via Delsplits just like
wenzelm@5726: Delsimps. Lower-case versions are also available.
wenzelm@5127:
wenzelm@5726: * HOL/Simplifier: The rule split_if is now part of the default
wenzelm@5726: simpset. This means that the simplifier will eliminate all occurrences
wenzelm@5726: of if-then-else in the conclusion of a goal. To prevent this, you can
wenzelm@5726: either remove split_if completely from the default simpset by
wenzelm@5726: `Delsplits [split_if]' or remove it in a specific call of the
wenzelm@5726: simplifier using `... delsplits [split_if]'. You can also add/delete
wenzelm@5726: other case splitting rules to/from the default simpset: every datatype
wenzelm@5726: generates suitable rules `split_t_case' and `split_t_case_asm' (where
wenzelm@5726: t is the name of the datatype).
wenzelm@5127:
wenzelm@5726: * Classical reasoner / Simplifier combination: new force_tac (and
wenzelm@5127: derivatives Force_tac, force) combines rewriting and classical
wenzelm@5127: reasoning (and whatever other tools) similarly to auto_tac, but is
wenzelm@5726: aimed to solve the given subgoal completely.
wenzelm@5127:
wenzelm@5127:
wenzelm@5127: *** General ***
wenzelm@5127:
wenzelm@5217: * new top-level commands `Goal' and `Goalw' that improve upon `goal'
wenzelm@5127: and `goalw': the theory is no longer needed as an explicit argument -
wenzelm@5127: the current theory context is used; assumptions are no longer returned
wenzelm@5127: at the ML-level unless one of them starts with ==> or !!; it is
wenzelm@5217: recommended to convert to these new commands using isatool fixgoal
wenzelm@5217: (backup your sources first!);
wenzelm@4842:
wenzelm@5217: * new top-level commands 'thm' and 'thms' for retrieving theorems from
wenzelm@5207: the current theory context, and 'theory' to lookup stored theories;
paulson@4806:
paulson@5722: * new theory section 'locale' for declaring constants, assumptions and
paulson@5722: definitions that have local scope;
paulson@5722:
wenzelm@5127: * new theory section 'nonterminals' for purely syntactic types;
wenzelm@4858:
wenzelm@5127: * new theory section 'setup' for generic ML setup functions
wenzelm@5127: (e.g. package initialization);
wenzelm@4869:
wenzelm@5131: * the distribution now includes Isabelle icons: see
wenzelm@5131: lib/logo/isabelle-{small,tiny}.xpm;
wenzelm@5131:
wenzelm@5363: * isatool install - install binaries with absolute references to
wenzelm@5363: ISABELLE_HOME/bin;
wenzelm@5363:
wenzelm@5572: * isatool logo -- create instances of the Isabelle logo (as EPS);
wenzelm@5572:
wenzelm@5407: * print mode 'emacs' reserved for Isamode;
wenzelm@5407:
wenzelm@5726: * support multiple print (ast) translations per constant name;
wenzelm@5726:
wenzelm@6925: * theorems involving oracles are now printed with a suffixed [!];
wenzelm@6925:
wenzelm@4711:
paulson@4661: *** HOL ***
paulson@4661:
wenzelm@5710: * there is now a tutorial on Isabelle/HOL (do 'isatool doc tutorial');
nipkow@5709:
wenzelm@5217: * HOL/inductive package reorganized and improved: now supports mutual
paulson@5267: definitions such as
wenzelm@5217:
wenzelm@5217: inductive EVEN ODD
wenzelm@5217: intrs
wenzelm@5217: null "0 : EVEN"
wenzelm@5217: oddI "n : EVEN ==> Suc n : ODD"
wenzelm@5217: evenI "n : ODD ==> Suc n : EVEN"
wenzelm@5217:
wenzelm@5217: new theorem list "elims" contains an elimination rule for each of the
wenzelm@5217: recursive sets; inductive definitions now handle disjunctive premises
wenzelm@5217: correctly (also ZF);
berghofe@5214:
wenzelm@5217: INCOMPATIBILITIES: requires Inductive as an ancestor; component
wenzelm@5217: "mutual_induct" no longer exists - the induction rule is always
wenzelm@5217: contained in "induct";
wenzelm@5217:
wenzelm@5217:
wenzelm@5217: * HOL/datatype package re-implemented and greatly improved: now
paulson@5267: supports mutually recursive datatypes such as
wenzelm@5217:
wenzelm@5217: datatype
wenzelm@5217: 'a aexp = IF_THEN_ELSE ('a bexp) ('a aexp) ('a aexp)
wenzelm@5217: | SUM ('a aexp) ('a aexp)
wenzelm@5217: | DIFF ('a aexp) ('a aexp)
wenzelm@5217: | NUM 'a
wenzelm@5217: and
wenzelm@5217: 'a bexp = LESS ('a aexp) ('a aexp)
wenzelm@5217: | AND ('a bexp) ('a bexp)
wenzelm@5217: | OR ('a bexp) ('a bexp)
wenzelm@5217:
paulson@5267: as well as indirectly recursive datatypes such as
berghofe@5214:
wenzelm@5217: datatype
wenzelm@5217: ('a, 'b) term = Var 'a
wenzelm@5217: | App 'b ((('a, 'b) term) list)
berghofe@5214:
wenzelm@5217: The new tactic mutual_induct_tac [, ..., ] i performs
wenzelm@5217: induction on mutually / indirectly recursive datatypes.
wenzelm@5217:
wenzelm@5217: Primrec equations are now stored in theory and can be accessed via
wenzelm@5217: .simps.
wenzelm@5217:
wenzelm@5217: INCOMPATIBILITIES:
berghofe@5214:
wenzelm@5217: - Theories using datatypes must now have theory Datatype as an
wenzelm@5217: ancestor.
wenzelm@5217: - The specific .induct_tac no longer exists - use the
wenzelm@5217: generic induct_tac instead.
berghofe@5226: - natE has been renamed to nat.exhaust - use exhaust_tac
wenzelm@5217: instead of res_inst_tac ... natE. Note that the variable
berghofe@5226: names in nat.exhaust differ from the names in natE, this
wenzelm@5217: may cause some "fragile" proofs to fail.
wenzelm@5217: - The theorems split__case and split__case_asm
wenzelm@5217: have been renamed to .split and .split_asm.
wenzelm@5217: - Since default sorts of type variables are now handled correctly,
wenzelm@5217: some datatype definitions may have to be annotated with explicit
wenzelm@5217: sort constraints.
wenzelm@5217: - Primrec definitions no longer require function name and type
wenzelm@5217: of recursive argument.
berghofe@5214:
wenzelm@5217: Consider using isatool fixdatatype to adapt your theories and proof
wenzelm@5217: scripts to the new package (backup your sources first!).
wenzelm@5217:
wenzelm@5217:
wenzelm@5726: * HOL/record package: considerably improved implementation; now
wenzelm@5726: includes concrete syntax for record types, terms, updates; theorems
wenzelm@5726: for surjective pairing and splitting !!-bound record variables; proof
wenzelm@5726: support is as follows:
wenzelm@5726:
wenzelm@5726: 1) standard conversions (selectors or updates applied to record
wenzelm@5726: constructor terms) are part of the standard simpset;
wenzelm@5726:
wenzelm@5726: 2) inject equations of the form ((x, y) = (x', y')) == x=x' & y=y' are
wenzelm@5726: made part of standard simpset and claset via addIffs;
wenzelm@5726:
wenzelm@5726: 3) a tactic for record field splitting (record_split_tac) is part of
wenzelm@5726: the standard claset (addSWrapper);
wenzelm@5726:
wenzelm@5726: To get a better idea about these rules you may retrieve them via
wenzelm@5726: something like 'thms "foo.simps"' or 'thms "foo.iffs"', where "foo" is
wenzelm@5726: the name of your record type.
wenzelm@5726:
wenzelm@5726: The split tactic 3) conceptually simplifies by the following rule:
wenzelm@5726:
wenzelm@5726: "(!!x. PROP ?P x) == (!!a b. PROP ?P (a, b))"
wenzelm@5726:
wenzelm@5726: Thus any record variable that is bound by meta-all will automatically
wenzelm@5726: blow up into some record constructor term, consequently the
wenzelm@5726: simplifications of 1), 2) apply. Thus force_tac, auto_tac etc. shall
wenzelm@5726: solve record problems automatically.
wenzelm@5726:
berghofe@5214:
wenzelm@5125: * reorganized the main HOL image: HOL/Integ and String loaded by
wenzelm@5125: default; theory Main includes everything;
wenzelm@5125:
paulson@5650: * automatic simplification of integer sums and comparisons, using cancellation;
paulson@5650:
oheimb@5526: * added option_map_eq_Some and not_Some_eq to the default simpset and claset;
wenzelm@5127:
wenzelm@5127: * added disj_not1 = "(~P | Q) = (P --> Q)" to the default simpset;
wenzelm@5127:
wenzelm@5127: * many new identities for unions, intersections, set difference, etc.;
wenzelm@5127:
wenzelm@5127: * expand_if, expand_split, expand_sum_case and expand_nat_case are now
wenzelm@5127: called split_if, split_split, split_sum_case and split_nat_case (to go
wenzelm@5127: with add/delsplits);
wenzelm@5125:
wenzelm@5127: * HOL/Prod introduces simplification procedure unit_eq_proc rewriting
wenzelm@5127: (?x::unit) = (); this is made part of the default simpset, which COULD
wenzelm@5127: MAKE EXISTING PROOFS FAIL under rare circumstances (consider
wenzelm@5207: 'Delsimprocs [unit_eq_proc];' as last resort); also note that
wenzelm@5207: unit_abs_eta_conv is added in order to counter the effect of
wenzelm@5207: unit_eq_proc on (%u::unit. f u), replacing it by f rather than by
wenzelm@5207: %u.f();
wenzelm@5125:
wenzelm@5217: * HOL/Fun INCOMPATIBILITY: `inj_onto' is now called `inj_on' (which
wenzelm@5217: makes more sense);
berghofe@5109:
paulson@5475: * HOL/Set INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475: It and 'sym RS equals0D' are now in the default claset, giving automatic
paulson@5475: disjointness reasoning but breaking a few old proofs.
paulson@5267:
wenzelm@5217: * HOL/Relation INCOMPATIBILITY: renamed the relational operator r^-1
wenzelm@5217: to 'converse' from 'inverse' (for compatibility with ZF and some
wenzelm@5217: literature);
wenzelm@5085:
wenzelm@5127: * HOL/recdef can now declare non-recursive functions, with {} supplied as
wenzelm@5127: the well-founded relation;
oheimb@4838:
paulson@5490: * HOL/Set INCOMPATIBILITY: the complement of set A is now written -A instead of
paulson@5490: Compl A. The "Compl" syntax remains available as input syntax for this
paulson@5490: release ONLY.
paulson@5490:
wenzelm@5127: * HOL/Update: new theory of function updates:
wenzelm@5127: f(a:=b) == %x. if x=a then b else f x
wenzelm@5127: may also be iterated as in f(a:=b,c:=d,...);
nipkow@5077:
wenzelm@5127: * HOL/Vimage: new theory for inverse image of a function, syntax f-``B;
paulson@4899:
nipkow@5282: * HOL/List:
nipkow@5282: - new function list_update written xs[i:=v] that updates the i-th
nipkow@5282: list position. May also be iterated as in xs[i:=a,j:=b,...].
nipkow@5428: - new function `upt' written [i..j(] which generates the list
nipkow@5428: [i,i+1,...,j-1], i.e. the upper bound is excluded. To include the upper
nipkow@5428: bound write [i..j], which is a shorthand for [i..j+1(].
nipkow@5282: - new lexicographic orderings and corresponding wellfoundedness theorems.
paulson@4779:
wenzelm@5127: * HOL/Arith:
wenzelm@5127: - removed 'pred' (predecessor) function;
wenzelm@5127: - generalized some theorems about n-1;
wenzelm@5127: - many new laws about "div" and "mod";
wenzelm@5127: - new laws about greatest common divisors (see theory ex/Primes);
oheimb@4766:
wenzelm@5127: * HOL/Relation: renamed the relational operator r^-1 "converse"
wenzelm@4842: instead of "inverse";
wenzelm@4711:
nipkow@5651: * HOL/Induct/Multiset: a theory of multisets, including the wellfoundedness
nipkow@5651: of the multiset ordering;
nipkow@5651:
wenzelm@5127: * directory HOL/Real: a construction of the reals using Dedekind cuts
nipkow@5651: (not included by default);
nipkow@4835:
wenzelm@5127: * directory HOL/UNITY: Chandy and Misra's UNITY formalism;
wenzelm@4711:
nipkow@5651: * directory HOL/Hoare: a new version of Hoare logic which permits many-sorted
nipkow@5651: programs, i.e. different program variables may have different types.
nipkow@5651:
paulson@5142: * calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142: [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308: Now rew can involve either definitions or equalities (either == or =).
wenzelm@5002:
wenzelm@5363:
paulson@4879: *** ZF ***
paulson@4879:
paulson@5332: * theory Main includes everything; INCOMPATIBILITY: theory ZF.thy contains
paulson@5332: only the theorems proved on ZF.ML;
paulson@5160:
paulson@5475: * ZF INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475: It and 'sym RS equals0D' are now in the default claset, giving automatic
paulson@5475: disjointness reasoning but breaking a few old proofs.
paulson@5267:
paulson@5160: * ZF/Update: new theory of function updates
paulson@5160: with default rewrite rule f(x:=y) ` z = if(z=x, y, f`z)
paulson@5160: may also be iterated as in f(a:=b,c:=d,...);
paulson@5160:
paulson@4879: * in let x=t in u(x), neither t nor u(x) has to be an FOL term.
oheimb@4649:
paulson@5142: * calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142: [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308: Now rew can involve either definitions or equalities (either == or =).
paulson@5142:
paulson@5160: * case_tac provided for compatibility with HOL
paulson@5160: (like the old excluded_middle_tac, but with subgoals swapped)
paulson@5160:
wenzelm@4842:
wenzelm@5127: *** Internal programming interfaces ***
wenzelm@5002:
wenzelm@5251: * Pure: several new basic modules made available for general use, see
wenzelm@5251: also src/Pure/README;
wenzelm@5207:
wenzelm@5008: * improved the theory data mechanism to support encapsulation (data
wenzelm@5008: kind name replaced by private Object.kind, acting as authorization
wenzelm@5373: key); new type-safe user interface via functor TheoryDataFun; generic
wenzelm@5373: print_data function becomes basically useless;
wenzelm@5002:
wenzelm@5251: * removed global_names compatibility flag -- all theory declarations
wenzelm@5251: are qualified by default;
wenzelm@5251:
wenzelm@5085: * module Pure/Syntax now offers quote / antiquote translation
wenzelm@5085: functions (useful for Hoare logic etc. with implicit dependencies);
wenzelm@5373: see HOL/ex/Antiquote for an example use;
wenzelm@5085:
wenzelm@5127: * Simplifier now offers conversions (asm_)(full_)rewrite: simpset ->
wenzelm@5127: cterm -> thm;
wenzelm@5127:
wenzelm@5207: * new tactical CHANGED_GOAL for checking that a tactic modifies a
wenzelm@5207: subgoal;
paulson@5142:
wenzelm@5251: * Display.print_goals function moved to Locale.print_goals;
wenzelm@5251:
wenzelm@5731: * standard print function for goals supports current_goals_markers
wenzelm@5731: variable for marking begin of proof, end of proof, start of goal; the
wenzelm@5731: default is ("", "", ""); setting current_goals_markers := ("",
wenzelm@5731: "", "") causes SGML like tagged proof state printing,
wenzelm@5731: for example;
wenzelm@5731:
wenzelm@5002:
wenzelm@5002:
wenzelm@4410: New in Isabelle98 (January 1998)
wenzelm@4410: --------------------------------
wenzelm@4410:
wenzelm@4410: *** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4410:
wenzelm@4410: * changed lexical syntax of terms / types: dots made part of long
wenzelm@4410: identifiers, e.g. "%x.x" no longer possible, should be "%x. x";
wenzelm@4410:
wenzelm@4410: * simpset (and claset) reference variable replaced by functions
wenzelm@4410: simpset / simpset_ref;
wenzelm@4410:
wenzelm@4410: * no longer supports theory aliases (via merge) and non-trivial
wenzelm@4410: implicit merge of thms' signatures;
wenzelm@4410:
wenzelm@4410: * most internal names of constants changed due to qualified names;
wenzelm@4410:
wenzelm@4410: * changed Pure/Sequence interface (see Pure/seq.ML);
wenzelm@4410:
wenzelm@3454:
paulson@3715: *** General Changes ***
paulson@3715:
wenzelm@4174: * hierachically structured name spaces (for consts, types, axms, thms
wenzelm@3943: etc.); new lexical class 'longid' (e.g. Foo.bar.x) may render much of
wenzelm@4108: old input syntactically incorrect (e.g. "%x.x"); COMPATIBILITY:
wenzelm@4108: isatool fixdots ensures space after dots (e.g. "%x. x"); set
wenzelm@4174: long_names for fully qualified output names; NOTE: ML programs
wenzelm@4174: (special tactics, packages etc.) referring to internal names may have
wenzelm@4174: to be adapted to cope with fully qualified names; in case of severe
wenzelm@4174: backward campatibility problems try setting 'global_names' at compile
wenzelm@4174: time to have enrything declared within a flat name space; one may also
wenzelm@4174: fine tune name declarations in theories via the 'global' and 'local'
wenzelm@4174: section;
wenzelm@4108:
wenzelm@4108: * reimplemented the implicit simpset and claset using the new anytype
wenzelm@4108: data filed in signatures; references simpset:simpset ref etc. are
wenzelm@4108: replaced by functions simpset:unit->simpset and
wenzelm@4108: simpset_ref:unit->simpset ref; COMPATIBILITY: use isatool fixclasimp
wenzelm@4108: to patch your ML files accordingly;
paulson@3856:
wenzelm@3857: * HTML output now includes theory graph data for display with Java
wenzelm@3857: applet or isatool browser; data generated automatically via isatool
wenzelm@3901: usedir (see -i option, ISABELLE_USEDIR_OPTIONS);
wenzelm@3857:
paulson@3856: * defs may now be conditional; improved rewrite_goals_tac to handle
paulson@3856: conditional equations;
paulson@3856:
wenzelm@4174: * defs now admits additional type arguments, using TYPE('a) syntax;
wenzelm@4174:
wenzelm@3901: * theory aliases via merge (e.g. M=A+B+C) no longer supported, always
wenzelm@3901: creates a new theory node; implicit merge of thms' signatures is
wenzelm@4112: restricted to 'trivial' ones; COMPATIBILITY: one may have to use
wenzelm@3901: transfer:theory->thm->thm in (rare) cases;
wenzelm@3901:
wenzelm@3968: * improved handling of draft signatures / theories; draft thms (and
wenzelm@3968: ctyps, cterms) are automatically promoted to real ones;
wenzelm@3968:
wenzelm@3901: * slightly changed interfaces for oracles: admit many per theory, named
wenzelm@3901: (e.g. oracle foo = mlfun), additional name argument for invoke_oracle;
wenzelm@3901:
wenzelm@3901: * print_goals: optional output of const types (set show_consts and
wenzelm@3901: show_types);
wenzelm@3851:
wenzelm@4388: * improved output of warnings (###) and errors (***);
wenzelm@3697:
paulson@4178: * subgoal_tac displays a warning if the new subgoal has type variables;
paulson@4178:
paulson@3715: * removed old README and Makefiles;
wenzelm@3697:
paulson@3856: * replaced print_goals_ref hook by print_current_goals_fn and result_error_fn;
wenzelm@3670:
paulson@3715: * removed obsolete init_pps and init_database;
paulson@3715:
paulson@3715: * deleted the obsolete tactical STATE, which was declared by
paulson@3715: fun STATE tacfun st = tacfun st st;
paulson@3715:
wenzelm@4388: * cd and use now support path variables, e.g. $ISABELLE_HOME, or ~
wenzelm@4388: (which abbreviates $HOME);
wenzelm@4269:
wenzelm@4269: * changed Pure/Sequence interface (see Pure/seq.ML); COMPATIBILITY:
wenzelm@4269: use isatool fixseq to adapt your ML programs (this works for fully
wenzelm@4269: qualified references to the Sequence structure only!);
wenzelm@4269:
wenzelm@4381: * use_thy no longer requires writable current directory; it always
wenzelm@4381: reloads .ML *and* .thy file, if either one is out of date;
wenzelm@4269:
paulson@3715:
paulson@3715: *** Classical Reasoner ***
paulson@3715:
wenzelm@3744: * Clarify_tac, clarify_tac, clarify_step_tac, Clarify_step_tac: new
wenzelm@3744: tactics that use classical reasoning to simplify a subgoal without
wenzelm@3744: splitting it into several subgoals;
paulson@3715:
paulson@3719: * Safe_tac: like safe_tac but uses the default claset;
paulson@3719:
paulson@3715:
paulson@3715: *** Simplifier ***
paulson@3715:
paulson@3715: * added simplification meta rules:
paulson@3715: (asm_)(full_)simplify: simpset -> thm -> thm;
paulson@3715:
paulson@3715: * simplifier.ML no longer part of Pure -- has to be loaded by object
paulson@3715: logics (again);
paulson@3715:
paulson@3715: * added prems argument to simplification procedures;
paulson@3715:
paulson@4325: * HOL, FOL, ZF: added infix function `addsplits':
paulson@4325: instead of ` setloop (split_tac )'
paulson@4325: you can simply write ` addsplits '
paulson@4325:
paulson@3715:
paulson@3715: *** Syntax ***
paulson@3715:
wenzelm@4174: * TYPE('a) syntax for type reflection terms;
wenzelm@4174:
wenzelm@3985: * no longer handles consts with name "" -- declare as 'syntax' instead;
paulson@3856:
paulson@3856: * pretty printer: changed order of mixfix annotation preference (again!);
wenzelm@3846:
paulson@3715: * Pure: fixed idt/idts vs. pttrn/pttrns syntactic categories;
paulson@3715:
paulson@3715:
paulson@3715: *** HOL ***
paulson@3715:
wenzelm@5726: * HOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189: with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189:
nipkow@4035: * HOL/TLA: Stephan Merz's formalization of Lamport's Temporal Logic of Actions;
wenzelm@3985:
wenzelm@3985: * HOL/Auth: new protocol proofs including some for the Internet
nipkow@4035: protocol TLS;
wenzelm@3985:
wenzelm@4125: * HOL/Map: new theory of `maps' a la VDM;
nipkow@3982:
wenzelm@4335: * HOL/simplifier: simplification procedures nat_cancel_sums for
wenzelm@4335: cancelling out common nat summands from =, <, <= (in)equalities, or
wenzelm@4335: differences; simplification procedures nat_cancel_factor for
wenzelm@4335: cancelling common factor from =, <, <= (in)equalities over natural
wenzelm@4373: sums; nat_cancel contains both kinds of procedures, it is installed by
wenzelm@4373: default in Arith.thy -- this COULD MAKE EXISTING PROOFS FAIL;
wenzelm@4335:
nipkow@3580: * HOL/simplifier: terms of the form
paulson@4325: `? x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x)' (or t=x)
nipkow@3580: are rewritten to
nipkow@4035: `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t)',
nipkow@4035: and those of the form
paulson@4325: `! x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x) --> R(x)' (or t=x)
nipkow@4035: are rewritten to
nipkow@4035: `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t) --> R(t)',
nipkow@4035:
nipkow@4035: * HOL/datatype
nipkow@4035: Each datatype `t' now comes with a theorem `split_t_case' of the form
nipkow@3580:
nipkow@4035: P(t_case f1 ... fn x) =
nipkow@4035: ( (!y1 ... ym1. x = C1 y1 ... ym1 --> P(f1 y1 ... ym1)) &
nipkow@4035: ...
oheimb@4189: (!y1 ... ymn. x = Cn y1 ... ymn --> P(f1 y1 ... ymn))
nipkow@4035: )
nipkow@4035:
oheimb@4930: and a theorem `split_t_case_asm' of the form
oheimb@4189:
oheimb@4189: P(t_case f1 ... fn x) =
oheimb@4189: ~( (? y1 ... ym1. x = C1 y1 ... ym1 & ~P(f1 y1 ... ym1)) |
oheimb@4189: ...
oheimb@4189: (? y1 ... ymn. x = Cn y1 ... ymn & ~P(f1 y1 ... ymn))
oheimb@4189: )
oheimb@4930: which can be added to a simpset via `addsplits'. The existing theorems
oheimb@4930: expand_list_case and expand_option_case have been renamed to
oheimb@4930: split_list_case and split_option_case.
oheimb@4189:
nipkow@4361: * HOL/Arithmetic:
nipkow@4361: - `pred n' is automatically converted to `n-1'.
nipkow@4361: Users are strongly encouraged not to use `pred' any longer,
nipkow@4361: because it will disappear altogether at some point.
nipkow@4361: - Users are strongly encouraged to write "0 < n" rather than
nipkow@4361: "n ~= 0". Theorems and proof tools have been modified towards this
nipkow@4361: `standard'.
nipkow@4357:
nipkow@4502: * HOL/Lists:
nipkow@4502: the function "set_of_list" has been renamed "set" (and its theorems too);
nipkow@4502: the function "nth" now takes its arguments in the reverse order and
nipkow@4502: has acquired the infix notation "!" as in "xs!n".
paulson@3570:
paulson@4154: * HOL/Set: UNIV is now a constant and is no longer translated to Compl{};
paulson@4154:
paulson@4154: * HOL/Set: The operator (UN x.B x) now abbreviates (UN x:UNIV. B x) and its
paulson@4154: specialist theorems (like UN1_I) are gone. Similarly for (INT x.B x);
paulson@4154:
wenzelm@4575: * HOL/record: extensible records with schematic structural subtyping
wenzelm@4575: (single inheritance); EXPERIMENTAL version demonstrating the encoding,
wenzelm@4575: still lacks various theorems and concrete record syntax;
wenzelm@4575:
wenzelm@4125:
paulson@3715: *** HOLCF ***
wenzelm@3535:
wenzelm@4125: * removed "axioms" and "generated by" sections;
wenzelm@4125:
oheimb@4123: * replaced "ops" section by extended "consts" section, which is capable of
wenzelm@4125: handling the continuous function space "->" directly;
wenzelm@4125:
wenzelm@4125: * domain package:
wenzelm@4125: . proves theorems immediately and stores them in the theory,
wenzelm@4125: . creates hierachical name space,
wenzelm@4125: . now uses normal mixfix annotations (instead of cinfix...),
wenzelm@4125: . minor changes to some names and values (for consistency),
wenzelm@4125: . e.g. cases -> casedist, dists_eq -> dist_eqs, [take_lemma] -> take_lemmas,
wenzelm@4125: . separator between mutual domain defs: changed "," to "and",
wenzelm@4125: . improved handling of sort constraints; now they have to
wenzelm@4125: appear on the left-hand side of the equations only;
oheimb@4123:
oheimb@4123: * fixed LAM .b syntax;
wenzelm@3567:
wenzelm@3744: * added extended adm_tac to simplifier in HOLCF -- can now discharge
wenzelm@3744: adm (%x. P (t x)), where P is chainfinite and t continuous;
wenzelm@3579:
wenzelm@3579:
paulson@3719: *** FOL and ZF ***
paulson@3719:
wenzelm@5726: * FOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189: with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189:
wenzelm@3744: * qed_spec_mp, qed_goal_spec_mp, qed_goalw_spec_mp are available, as
wenzelm@3744: in HOL, they strip ALL and --> from proved theorems;
wenzelm@3744:
paulson@3719:
wenzelm@3579:
wenzelm@3006: New in Isabelle94-8 (May 1997)
wenzelm@3006: ------------------------------
wenzelm@2654:
paulson@3002: *** General Changes ***
paulson@3002:
paulson@3002: * new utilities to build / run / maintain Isabelle etc. (in parts
paulson@3002: still somewhat experimental); old Makefiles etc. still functional;
wenzelm@2971:
wenzelm@3205: * new 'Isabelle System Manual';
wenzelm@3205:
wenzelm@2825: * INSTALL text, together with ./configure and ./build scripts;
wenzelm@2773:
wenzelm@3006: * reimplemented type inference for greater efficiency, better error
wenzelm@3006: messages and clean internal interface;
paulson@3002:
paulson@3002: * prlim command for dealing with lots of subgoals (an easier way of
paulson@3002: setting goals_limit);
paulson@3002:
wenzelm@3006:
wenzelm@3006: *** Syntax ***
paulson@3002:
wenzelm@3116: * supports alternative (named) syntax tables (parser and pretty
wenzelm@3116: printer); internal interface is provided by add_modesyntax(_i);
wenzelm@3116:
paulson@3002: * Pure, FOL, ZF, HOL, HOLCF now support symbolic input and output; to
paulson@3002: be used in conjunction with the Isabelle symbol font; uses the
paulson@3002: "symbols" syntax table;
paulson@3002:
wenzelm@2705: * added token_translation interface (may translate name tokens in
wenzelm@2756: arbitrary ways, dependent on their type (free, bound, tfree, ...) and
wenzelm@3116: the current print_mode); IMPORTANT: user print translation functions
wenzelm@3116: are responsible for marking newly introduced bounds
wenzelm@3116: (Syntax.mark_boundT);
wenzelm@2705:
wenzelm@2730: * token translations for modes "xterm" and "xterm_color" that display
wenzelm@3006: names in bold, underline etc. or colors (which requires a color
wenzelm@3006: version of xterm);
wenzelm@2730:
paulson@3002: * infixes may now be declared with names independent of their syntax;
paulson@3002:
paulson@3002: * added typed_print_translation (like print_translation, but may
paulson@3002: access type of constant);
paulson@3002:
wenzelm@3006:
paulson@3002: *** Classical Reasoner ***
paulson@3002:
paulson@3002: Blast_tac: a new tactic! It is often more powerful than fast_tac, but has
paulson@3002: some limitations. Blast_tac...
paulson@3002: + ignores addss, addbefore, addafter; this restriction is intrinsic
paulson@3002: + ignores elimination rules that don't have the correct format
wenzelm@5726: (the conclusion MUST be a formula variable)
paulson@3002: + ignores types, which can make HOL proofs fail
paulson@3002: + rules must not require higher-order unification, e.g. apply_type in ZF
paulson@3002: [message "Function Var's argument not a bound variable" relates to this]
paulson@3002: + its proof strategy is more general but can actually be slower
paulson@3002:
wenzelm@3107: * substitution with equality assumptions no longer permutes other
wenzelm@3107: assumptions;
paulson@3002:
paulson@3002: * minor changes in semantics of addafter (now called addaltern); renamed
paulson@3002: setwrapper to setWrapper and compwrapper to compWrapper; added safe wrapper
wenzelm@3107: (and access functions for it);
paulson@3002:
wenzelm@5726: * improved combination of classical reasoner and simplifier:
oheimb@3317: + functions for handling clasimpsets
oheimb@3317: + improvement of addss: now the simplifier is called _after_ the
oheimb@3317: safe steps.
oheimb@3317: + safe variant of addss called addSss: uses safe simplifications
wenzelm@5726: _during_ the safe steps. It is more complete as it allows multiple
oheimb@3317: instantiations of unknowns (e.g. with slow_tac).
wenzelm@3006:
paulson@3002: *** Simplifier ***
paulson@3002:
wenzelm@3006: * added interface for simplification procedures (functions that
wenzelm@3006: produce *proven* rewrite rules on the fly, depending on current
wenzelm@3006: redex);
wenzelm@3006:
wenzelm@3006: * ordering on terms as parameter (used for ordered rewriting);
wenzelm@3006:
wenzelm@3107: * new functions delcongs, deleqcongs, and Delcongs. richer rep_ss;
paulson@3002:
paulson@3002: * the solver is now split into a safe and an unsafe part.
paulson@3002: This should be invisible for the normal user, except that the
paulson@3002: functions setsolver and addsolver have been renamed to setSolver and
wenzelm@3107: addSolver; added safe_asm_full_simp_tac;
paulson@3002:
paulson@3002:
paulson@3002: *** HOL ***
paulson@3002:
nipkow@3042: * a generic induction tactic `induct_tac' which works for all datatypes and
wenzelm@3107: also for type `nat';
nipkow@3042:
nipkow@3316: * a generic case distinction tactic `exhaust_tac' which works for all
nipkow@3316: datatypes and also for type `nat';
nipkow@3316:
nipkow@3316: * each datatype comes with a function `size';
nipkow@3316:
paulson@3002: * patterns in case expressions allow tuple patterns as arguments to
wenzelm@3107: constructors, for example `case x of [] => ... | (x,y,z)#ps => ...';
paulson@3002:
paulson@3002: * primrec now also works with type nat;
paulson@3002:
paulson@3338: * recdef: a new declaration form, allows general recursive functions to be
paulson@3338: defined in theory files. See HOL/ex/Fib, HOL/ex/Primes, HOL/Subst/Unify.
paulson@3338:
paulson@3002: * the constant for negation has been renamed from "not" to "Not" to
wenzelm@3107: harmonize with FOL, ZF, LK, etc.;
paulson@3002:
wenzelm@3107: * HOL/ex/LFilter theory of a corecursive "filter" functional for
wenzelm@3107: infinite lists;
paulson@3002:
wenzelm@3227: * HOL/Modelcheck demonstrates invocation of model checker oracle;
wenzelm@3227:
paulson@3002: * HOL/ex/Ring.thy declares cring_simp, which solves equational
paulson@3002: problems in commutative rings, using axiomatic type classes for + and *;
paulson@3002:
paulson@3002: * more examples in HOL/MiniML and HOL/Auth;
paulson@3002:
paulson@3002: * more default rewrite rules for quantifiers, union/intersection;
paulson@3002:
nipkow@3321: * a new constant `arbitrary == @x.False';
nipkow@3321:
wenzelm@3107: * HOLCF/IOA replaces old HOL/IOA;
wenzelm@3107:
wenzelm@5726: * HOLCF changes: derived all rules and arities
wenzelm@5726: + axiomatic type classes instead of classes
slotosch@2653: + typedef instead of faking type definitions
paulson@2747: + eliminated the internal constants less_fun, less_cfun, UU_fun, UU_cfun etc.
wenzelm@2730: + new axclasses cpo, chfin, flat with flat < chfin < pcpo < cpo < po
slotosch@2653: + eliminated the types void, one, tr
slotosch@2653: + use unit lift and bool lift (with translations) instead of one and tr
slotosch@2653: + eliminated blift from Lift3.thy (use Def instead of blift)
wenzelm@3107: all eliminated rules are derived as theorems --> no visible changes ;
oheimb@2649:
wenzelm@3006:
paulson@3002: *** ZF ***
wenzelm@2553:
paulson@2865: * ZF now has Fast_tac, Simp_tac and Auto_tac. Union_iff is a now a default
paulson@2865: rewrite rule; this may affect some proofs. eq_cs is gone but can be put back
paulson@2865: as ZF_cs addSIs [equalityI];
wenzelm@2553:
wenzelm@2554:
wenzelm@2732:
wenzelm@2553: New in Isabelle94-7 (November 96)
wenzelm@2553: ---------------------------------
wenzelm@2553:
wenzelm@2553: * allowing negative levels (as offsets) in prlev and choplev;
wenzelm@2553:
wenzelm@2554: * super-linear speedup for large simplifications;
wenzelm@2554:
wenzelm@2554: * FOL, ZF and HOL now use miniscoping: rewriting pushes
wenzelm@2554: quantifications in as far as possible (COULD MAKE EXISTING PROOFS
wenzelm@2554: FAIL); can suppress it using the command Delsimps (ex_simps @
wenzelm@2554: all_simps); De Morgan laws are also now included, by default;
wenzelm@2554:
wenzelm@2554: * improved printing of ==> : ~:
wenzelm@2554:
wenzelm@2554: * new object-logic "Sequents" adds linear logic, while replacing LK
wenzelm@2554: and Modal (thanks to Sara Kalvala);
wenzelm@2554:
wenzelm@2554: * HOL/Auth: correctness proofs for authentication protocols;
wenzelm@2554:
wenzelm@2554: * HOL: new auto_tac combines rewriting and classical reasoning (many
wenzelm@2554: examples on HOL/Auth);
wenzelm@2554:
wenzelm@2554: * HOL: new command AddIffs for declaring theorems of the form P=Q to
wenzelm@2554: the rewriter and classical reasoner simultaneously;
wenzelm@2554:
wenzelm@2554: * function uresult no longer returns theorems in "standard" format;
wenzelm@2554: regain previous version by: val uresult = standard o uresult;
wenzelm@2554:
wenzelm@2554:
wenzelm@2554:
wenzelm@2554: New in Isabelle94-6
wenzelm@2554: -------------------
wenzelm@2554:
wenzelm@2554: * oracles -- these establish an interface between Isabelle and trusted
wenzelm@2554: external reasoners, which may deliver results as theorems;
wenzelm@2554:
wenzelm@2554: * proof objects (in particular record all uses of oracles);
wenzelm@2554:
wenzelm@2554: * Simp_tac, Fast_tac, etc. that refer to implicit simpset / claset;
wenzelm@2554:
wenzelm@2554: * "constdefs" section in theory files;
wenzelm@2554:
wenzelm@2554: * "primrec" section (HOL) no longer requires names;
wenzelm@2554:
wenzelm@2554: * internal type "tactic" now simply "thm -> thm Sequence.seq";
wenzelm@2554:
wenzelm@2554:
wenzelm@2554:
wenzelm@2554: New in Isabelle94-5
wenzelm@2554: -------------------
wenzelm@2554:
wenzelm@2554: * reduced space requirements;
wenzelm@2554:
wenzelm@2554: * automatic HTML generation from theories;
wenzelm@2554:
wenzelm@2554: * theory files no longer require "..." (quotes) around most types;
wenzelm@2554:
wenzelm@2554: * new examples, including two proofs of the Church-Rosser theorem;
wenzelm@2554:
wenzelm@2554: * non-curried (1994) version of HOL is no longer distributed;
wenzelm@2554:
wenzelm@2553:
paulson@2557:
paulson@2557: New in Isabelle94-4
paulson@2557: -------------------
paulson@2557:
paulson@2747: * greatly reduced space requirements;
paulson@2557:
paulson@2557: * theory files (.thy) no longer require \...\ escapes at line breaks;
paulson@2557:
wenzelm@5726: * searchable theorem database (see the section "Retrieving theorems" on
paulson@2557: page 8 of the Reference Manual);
paulson@2557:
paulson@2557: * new examples, including Grabczewski's monumental case study of the
paulson@2557: Axiom of Choice;
paulson@2557:
paulson@2557: * The previous version of HOL renamed to Old_HOL;
paulson@2557:
wenzelm@5726: * The new version of HOL (previously called CHOL) uses a curried syntax
paulson@2557: for functions. Application looks like f a b instead of f(a,b);
paulson@2557:
paulson@2557: * Mutually recursive inductive definitions finally work in HOL;
paulson@2557:
paulson@2557: * In ZF, pattern-matching on tuples is now available in all abstractions and
paulson@2557: translates to the operator "split";
paulson@2557:
paulson@2557:
paulson@2557:
paulson@2557: New in Isabelle94-3
paulson@2557: -------------------
paulson@2557:
wenzelm@5726: * new infix operator, addss, allowing the classical reasoner to
paulson@2557: perform simplification at each step of its search. Example:
wenzelm@5726: fast_tac (cs addss ss)
paulson@2557:
wenzelm@5726: * a new logic, CHOL, the same as HOL, but with a curried syntax
wenzelm@5726: for functions. Application looks like f a b instead of f(a,b). Also pairs
paulson@2557: look like (a,b) instead of ;
paulson@2557:
paulson@2557: * PLEASE NOTE: CHOL will eventually replace HOL!
paulson@2557:
paulson@2557: * In CHOL, pattern-matching on tuples is now available in all abstractions.
paulson@2557: It translates to the operator "split". A new theory of integers is available;
paulson@2557:
paulson@2557: * In ZF, integer numerals now denote two's-complement binary integers.
paulson@2557: Arithmetic operations can be performed by rewriting. See ZF/ex/Bin.ML;
paulson@2557:
wenzelm@5726: * Many new examples: I/O automata, Church-Rosser theorem, equivalents
paulson@2557: of the Axiom of Choice;
paulson@2557:
paulson@2557:
paulson@2557:
paulson@2557: New in Isabelle94-2
paulson@2557: -------------------
paulson@2557:
wenzelm@5726: * Significantly faster resolution;
paulson@2557:
paulson@2557: * the different sections in a .thy file can now be mixed and repeated
paulson@2557: freely;
paulson@2557:
paulson@2557: * Database of theorems for FOL, HOL and ZF. New
paulson@2557: commands including qed, qed_goal and bind_thm store theorems in the database.
paulson@2557:
paulson@2557: * Simple database queries: return a named theorem (get_thm) or all theorems of
paulson@2557: a given theory (thms_of), or find out what theory a theorem was proved in
paulson@2557: (theory_of_thm);
paulson@2557:
paulson@2557: * Bugs fixed in the inductive definition and datatype packages;
paulson@2557:
paulson@2557: * The classical reasoner provides deepen_tac and depth_tac, making FOL_dup_cs
paulson@2557: and HOL_dup_cs obsolete;
paulson@2557:
paulson@2557: * Syntactic ambiguities caused by the new treatment of syntax in Isabelle94-1
paulson@2557: have been removed;
paulson@2557:
paulson@2557: * Simpler definition of function space in ZF;
paulson@2557:
paulson@2557: * new results about cardinal and ordinal arithmetic in ZF;
paulson@2557:
paulson@2557: * 'subtype' facility in HOL for introducing new types as subsets of existing
paulson@2557: types;
paulson@2557:
paulson@2557:
wenzelm@2553: $Id$