NEWS
author wenzelm
Tue Jul 04 01:12:42 2000 +0200 (2000-07-04)
changeset 9239 b31c2132176a
parent 9229 a7c6ea7e57de
child 9288 06a55195741b
permissions -rw-r--r--
* added 'nothing' --- the empty list of theorems;
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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: simplification of natural numbers is much changed; to partly
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recover the old behaviour (e.g. to prevent n+n rewriting to #2*n)
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issue the following ML commands:
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  Delsimprocs Nat_Numeral_Simprocs.cancel_numerals;
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  Delsimprocs [Nat_Numeral_Simprocs.combine_numerals];
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* HOL: 0 is now overloaded, so the type constraint ::nat may sometimes be
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needed;
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* HOL: the constant for f``x is now "image" rather than "op ``";
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* HOL: the cartesian product is now "<*>" instead of "Times"; the
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lexicographic product is now "<*lex*>" instead of "**";
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* HOL: exhaust_tac on datatypes superceded by new generic case_tac;
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* HOL: simplification no longer dives into case-expressions
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* HOL: the recursion equations generated by 'recdef' are now called
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f.simps instead of f.rules;
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* HOL: theory Sexp now in HOL/Induct examples (used to be part of main
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HOL, but was unused); should better use HOL's datatype package anyway;
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* HOL/Real: "rabs" replaced by overloaded "abs" function;
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* HOL/ML: even fewer consts are declared as global (see theories Ord,
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Lfp, Gfp, WF); this only affects ML packages that refer to const names
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internally;
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* Isar: changed syntax of local blocks from {{ }} to { };
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* Provers: Blast_tac now warns of and ignores "weak elimination rules" e.g.
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  [| inj ?f;          ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
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use instead the strong form,
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  [| inj ?f; ~ ?W ==> ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
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In HOL, FOR and ZF the function cla_make_elim will create such rules
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from destruct-rules;
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* ML: renamed flags Syntax.trace_norm_ast to Syntax.trace_ast; global
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timing flag supersedes proof_timing and Toplevel.trace;
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* ML: PureThy.add_thms/add_axioms/add_defs return theorems as well;
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* LaTeX: several improvements of isabelle.sty;
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*** Document preparation ***
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* formal comments (text blocks etc.) in new-style theories may now
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contain antiquotations of thm/prop/term/typ to be presented according
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to latex print mode; concrete syntax is like this: @{term[show_types]
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"f(x) = a + x"};
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* isatool mkdir provides easy setup of Isabelle session directories,
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including proper document sources;
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* generated LaTeX sources are now deleted after successful run
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(isatool document -c); may retain a copy somewhere else via -D option
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of isatool usedir;
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* isatool usedir -D now lets isatool latex -o sty update the Isabelle
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style files, achieving self-contained LaTeX sources;
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* old-style theories now produce (crude) LaTeX output as well;
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* browser info session directories are now self-contained (may be put
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on WWW server seperately);
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*** Isar ***
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* Pure: local results and corresponding term bindings are now subject
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to Hindley-Milner polymorphism (similar to ML); this accommodates
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incremental type-inference nicely;
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* Pure: new 'obtain' language element supports generalized existence
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reasoning;
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* Pure: new calculational elements 'moreover' and 'ultimately' support
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plain accumulation of results, without applying any rules yet;
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* Pure: scalable support for case-analysis type proofs: new 'case'
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language element refers to local contexts symbolically, as produced by
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certain proof methods; internally, case names are attached to theorems
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as "tags";
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* Pure: changed syntax of local blocks from {{ }} to { };
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* Pure: syntax of sorts made inner, i.e. have to write "{a, b, c}"
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instead of {a, b, c};
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* Pure now provides its own version of intro/elim/dest attributes;
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useful for building new logics, but beware of confusion with the
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Provers/classical ones;
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* Pure: the local context of (non-atomic) goals is provided via case
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name 'antecedent';
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* Pure: removed obsolete 'transfer' attribute (transfer of thms to the
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current context is now done automatically);
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* Pure: theory command 'hide' removes declarations from
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class/type/const name spaces;
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* Pure: theory command 'method_setup' provides a simple interface for
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definining proof methods in ML;
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* Provers: splitter support (via 'split' attribute and 'simp' method
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modifier); 'simp' method: 'only:' modifier removes loopers as well
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(including splits);
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* HOL: new proof method 'cases' and improved version of 'induct' now
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support named cases; major packages (inductive, datatype, primrec,
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recdef) support case names and properly name parameters;
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* HOL: removed 'case_split' thm binding, should use 'cases' proof
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method anyway;
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* HOL/Calculation: new rules for substitution in inequalities
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(monotonicity conditions are extracted to be proven terminally);
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* names of theorems etc. may be natural numbers as well;
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* Provers: intro/elim/dest attributes: changed ! / !! flags to ? / ??;
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* 'pr' command: optional goals_limit argument; no longer prints theory
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contexts, but only proof states;
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* diagnostic commands 'pr', 'thm', 'prop', 'term', 'typ' admit
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additional print modes to be specified; e.g. "pr(latex)" will print
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proof state according to the Isabelle LaTeX style;
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* improved support for emulating tactic scripts, including proof
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methods 'tactic', 'res_inst_tac' etc., 'subgoal_tac', and 'case_tac' /
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'induct_tac' (for HOL datatypes);
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* simplified (more robust) goal selection of proof methods: 1st goal,
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all goals, or explicit goal specifier (tactic emulation); thus 'proof
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method scripts' have to be in depth-first order;
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* tuned 'let' syntax: replaced 'as' keyword by 'and';
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* removed 'help' command, which hasn't been too helpful anyway; should
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instead use individual commands for printing items (print_commands,
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print_methods etc.);
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* added 'nothing' --- the empty list of theorems;
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*** HOL ***
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* HOL/Prolog: a (bare-bones) implementation of Lambda-Prolog
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* HOL/Algebra: new theory of rings and univariate polynomials, by
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Clemens Ballarin;
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* HOL/record: fixed select-update simplification procedure to handle
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extended records as well; admit "r" as field name;
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* HOL/ex: new theory Factorization proving the Fundamental Theorem of
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Arithmetic, by Thomas M Rasmussen;
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* HOL/ex/Multiquote: multiple nested quotations and anti-quotations --
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basically a generalized version of de-Bruijn representation; very
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useful in avoiding lifting all operations;
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* HOL/Real: "rabs" replaced by overloaded "abs" function;
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* HOL: 0 is now overloaded over the new sort "zero", allowing its use with
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other numeric types and also as the identity of groups, rings, etc.;
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* HOL: new axclass plus_ac0 for addition with the AC-laws and 0 as identity.
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Types nat and int belong to this axclass;
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* greatly improved simplification involving numerals of type nat, int, real:
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   (i + #8 + j) = Suc k simplifies to  #7 + (i + j) = k
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   i*j + k + j*#3*i     simplifies to  #4*(i*j) + k
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  two terms #m*u and #n*u are replaced by #(m+n)*u
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    (where #m, #n and u can implicitly be 1; this is simproc combine_numerals)
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  and the term/formula #m*u+x ~~ #n*u+y simplifies simplifies to #(m-n)+x ~~ y
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    or x ~~ #(n-m)+y, where ~~ is one of = < <= or - (simproc cancel_numerals);
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* HOL: new version of "case_tac" subsumes both boolean case split and
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"exhaust_tac" on datatypes; INCOMPATIBILITY: exhaust_tac no longer
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exists, may define val exhaust_tac = case_tac for ad-hoc portability;
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* HOL: simplification no longer dives into case-expressions: only the
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selector expression is simplified, but not the remaining arms. To
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enable full simplification of case-expressions for datatype t, you
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need to remove t.weak_case_cong from the simpset, either permanently
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(Delcongs[thm"t.weak_case_cong"];) or locally (delcongs [...]).
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* HOL/recdef: the recursion equations generated by 'recdef' for
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function 'f' are now called f.simps instead of f.rules; if all
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termination conditions are proved automatically, these simplification
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rules are added to the simpset, as in primrec; rules may be named
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individually as well, resulting in a separate list of theorems for
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each equation;
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* HOL: new (overloaded) notation for the set of elements below/above some
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element: {..u}, {..u(}, {l..}, {)l..}. See theory SetInterval.
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* HOL: theorems impI, allI, ballI bound as "strip";
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* theory Sexp now in HOL/Induct examples (used to be part of main HOL,
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but was unused);
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* fewer consts declared as global (e.g. have to refer to "Lfp.lfp"
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instead of "lfp" internally; affects ML packages only);
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*** General ***
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* improved name spaces: ambiguous output is qualified; support for
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hiding of names;
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* compression of ML heaps images may now be controlled via -c option
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of isabelle and isatool usedir (currently only observed by Poly/ML);
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* provide TAGS file for Isabelle sources;
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* ML: renamed flags Syntax.trace_norm_ast to Syntax.trace_ast; global
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timing flag supersedes proof_timing and Toplevel.trace;
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* ML: new combinators |>> and |>>> for incremental transformations
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with secondary results (e.g. certain theory extensions):
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New in Isabelle99 (October 1999)
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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/datatype: mutual_induct_tac no longer exists --
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  use induct_tac "x_1 ... x_n" instead of mutual_induct_tac ["x_1", ..., "x_n"]
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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); for further information see isatool doc isar-ref,
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src/HOL/Isar_examples and http://isabelle.in.tum.de/Isar/
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* improved presentation of theories: 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); actual document
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preparation based on (PDF)LaTeX is available as well (for new-style
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theories only); see isatool doc system for more information;
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* native support for Proof General, both for classic Isabelle and
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Isabelle/Isar;
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* ML function thm_deps visualizes dependencies of theorems and lemmas,
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using the graph browser tool;
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* Isabelle manuals now also available as PDF;
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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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* the settings environment is now statically scoped, i.e. it is never
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created again in sub-processes invoked from isabelle, isatool, or
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Isabelle;
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* path element specification '~~' refers to '$ISABELLE_HOME';
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* in locales, the "assumes" and "defines" parts may be omitted if
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empty;
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* new print_mode "xsymbols" for extended symbol support (e.g. genuine
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long arrows);
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* new print_mode "HTML";
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* new flag show_tags controls display of tags of theorems (which are
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basically just comments that may be attached by some tools);
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* Isamode 2.6 requires patch to accomodate change of Isabelle font
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mode and goal output format:
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diff -r Isamode-2.6/elisp/isa-load.el Isamode/elisp/isa-load.el
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244c244
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<       (list (isa-getenv "ISABELLE") "-msymbols" logic-name)
wenzelm@6461
   351
---
wenzelm@6533
   352
>       (list (isa-getenv "ISABELLE") "-misabelle_font" "-msymbols" logic-name)
wenzelm@6461
   353
diff -r Isabelle-2.6/elisp/isa-proofstate.el Isamode/elisp/isa-proofstate.el
wenzelm@6461
   354
181c181
wenzelm@6461
   355
< (defconst proofstate-proofstart-regexp "^Level [0-9]+$"
wenzelm@6461
   356
---
wenzelm@6461
   357
> (defconst proofstate-proofstart-regexp "^Level [0-9]+"
wenzelm@6461
   358
wenzelm@7450
   359
* function bind_thms stores lists of theorems (cf. bind_thm);
wenzelm@7450
   360
wenzelm@7593
   361
* new shorthand tactics ftac, eatac, datac, fatac;
wenzelm@7593
   362
wenzelm@7593
   363
* qed (and friends) now accept "" as result name; in that case the
wenzelm@7986
   364
theorem is not stored, but proper checks and presentation of the
wenzelm@7986
   365
result still apply;
wenzelm@7593
   366
wenzelm@7805
   367
* theorem database now also indexes constants "Trueprop", "all",
wenzelm@7805
   368
"==>", "=="; thus thms_containing, findI etc. may retrieve more rules;
wenzelm@7805
   369
oheimb@6028
   370
nipkow@6057
   371
*** HOL ***
nipkow@6057
   372
wenzelm@7215
   373
** HOL arithmetic **
wenzelm@7215
   374
wenzelm@6343
   375
* There are now decision procedures for linear arithmetic over nat and
wenzelm@6343
   376
int:
nipkow@6131
   377
wenzelm@6343
   378
1. arith_tac copes with arbitrary formulae involving `=', `<', `<=',
wenzelm@6343
   379
`+', `-', `Suc', `min', `max' and numerical constants; other subterms
wenzelm@6343
   380
are treated as atomic; subformulae not involving type `nat' or `int'
wenzelm@6343
   381
are ignored; quantified subformulae are ignored unless they are
wenzelm@6343
   382
positive universal or negative existential. The tactic has to be
wenzelm@6343
   383
invoked by hand and can be a little bit slow. In particular, the
wenzelm@6343
   384
running time is exponential in the number of occurrences of `min' and
wenzelm@6343
   385
`max', and `-' on `nat'.
nipkow@6131
   386
wenzelm@6343
   387
2. fast_arith_tac is a cut-down version of arith_tac: it only takes
wenzelm@6343
   388
(negated) (in)equalities among the premises and the conclusion into
wenzelm@6343
   389
account (i.e. no compound formulae) and does not know about `min' and
wenzelm@6343
   390
`max', and `-' on `nat'. It is fast and is used automatically by the
wenzelm@6343
   391
simplifier.
nipkow@6131
   392
wenzelm@6343
   393
NB: At the moment, these decision procedures do not cope with mixed
wenzelm@6343
   394
nat/int formulae where the two parts interact, such as `m < n ==>
wenzelm@6343
   395
int(m) < int(n)'.
oheimb@6028
   396
wenzelm@7215
   397
* HOL/Numeral provides a generic theory of numerals (encoded
wenzelm@7313
   398
efficiently as bit strings); setup for types nat/int/real is in place;
wenzelm@7215
   399
INCOMPATIBILITY: since numeral syntax is now polymorphic, rather than
wenzelm@7215
   400
int, existing theories and proof scripts may require a few additional
wenzelm@7215
   401
type constraints;
wenzelm@7215
   402
wenzelm@7215
   403
* integer division and remainder can now be performed on constant
wenzelm@7215
   404
arguments;
paulson@7157
   405
wenzelm@7215
   406
* many properties of integer multiplication, division and remainder
wenzelm@7215
   407
are now available;
paulson@6922
   408
paulson@7287
   409
* An interface to the Stanford Validity Checker (SVC) is available through the
paulson@7287
   410
tactic svc_tac.  Propositional tautologies and theorems of linear arithmetic
paulson@7287
   411
are proved automatically.  SVC must be installed separately, and its results
paulson@7287
   412
must be TAKEN ON TRUST (Isabelle does not check the proofs, but tags any
paulson@7287
   413
invocation of the underlying oracle).  For SVC see
paulson@7444
   414
  http://verify.stanford.edu/SVC
paulson@6922
   415
wenzelm@7125
   416
* IsaMakefile: the HOL-Real target now builds an actual image;
wenzelm@7125
   417
wenzelm@7215
   418
wenzelm@7215
   419
** HOL misc **
wenzelm@7215
   420
wenzelm@7595
   421
* HOL/Real/HahnBanach: the Hahn-Banach theorem for real vector spaces
wenzelm@7595
   422
(in Isabelle/Isar) -- by Gertrud Bauer;
wenzelm@7595
   423
wenzelm@7691
   424
* HOL/BCV: generic model of bytecode verification, i.e. data-flow
wenzelm@7691
   425
analysis for assembly languages with subtypes;
wenzelm@7691
   426
wenzelm@6278
   427
* HOL/TLA (Lamport's Temporal Logic of Actions): major reorganization
wenzelm@6278
   428
-- avoids syntactic ambiguities and treats state, transition, and
wenzelm@6278
   429
temporal levels more uniformly; introduces INCOMPATIBILITIES due to
wenzelm@6278
   430
changed syntax and (many) tactics;
wenzelm@6278
   431
wenzelm@7791
   432
* HOL/inductive: Now also handles more general introduction rules such
wenzelm@7791
   433
  as "ALL y. (y, x) : r --> y : acc r ==> x : acc r"; monotonicity
wenzelm@7791
   434
  theorems are now maintained within the theory (maintained via the
wenzelm@7791
   435
  "mono" attribute);
berghofe@7780
   436
wenzelm@7238
   437
* HOL/datatype: Now also handles arbitrarily branching datatypes
wenzelm@7238
   438
  (using function types) such as
wenzelm@7238
   439
wenzelm@7238
   440
  datatype 'a tree = Atom 'a | Branch "nat => 'a tree"
berghofe@7047
   441
wenzelm@7326
   442
* HOL/record: record_simproc (part of the default simpset) takes care
wenzelm@7326
   443
of selectors applied to updated records; record_split_tac is no longer
wenzelm@7327
   444
part of the default claset; update_defs may now be removed from the
wenzelm@7327
   445
simpset in many cases; COMPATIBILITY: old behavior achieved by
wenzelm@7326
   446
wenzelm@7326
   447
  claset_ref () := claset() addSWrapper record_split_wrapper;
wenzelm@7326
   448
  Delsimprocs [record_simproc]
wenzelm@7326
   449
wenzelm@6386
   450
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
   451
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
   452
paulson@7287
   453
* HOL/recdef (TFL): 'congs' syntax now expects comma separated list of theorem
paulson@7287
   454
names rather than an ML expression;
paulson@7287
   455
paulson@7287
   456
* HOL/defer_recdef (TFL): like recdef but the well-founded relation can be
paulson@7287
   457
supplied later.  Program schemes can be defined, such as
paulson@7287
   458
    "While B C s = (if B s then While B C (C s) else s)"
paulson@7287
   459
where the well-founded relation can be chosen after B and C have been given.
wenzelm@6563
   460
wenzelm@7215
   461
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
   462
INCOMPATIBILITY: while [] and infix # syntax is still there, of
wenzelm@7215
   463
course, ML tools referring to List.list.op # etc. have to be adapted;
wenzelm@7215
   464
wenzelm@7238
   465
* HOL_quantifiers flag superseded by "HOL" print mode, which is
wenzelm@7238
   466
disabled by default; run isabelle with option -m HOL to get back to
wenzelm@7238
   467
the original Gordon/HOL-style output;
wenzelm@7238
   468
wenzelm@7238
   469
* HOL/Ord.thy: new bounded quantifier syntax (input only): ALL x<y. P,
wenzelm@7238
   470
ALL x<=y. P, EX x<y. P, EX x<=y. P;
wenzelm@7238
   471
wenzelm@7238
   472
* HOL basic syntax simplified (more orthogonal): all variants of
wenzelm@7238
   473
All/Ex now support plain / symbolic / HOL notation; plain syntax for
wenzelm@7238
   474
Eps operator is provided as well: "SOME x. P[x]";
wenzelm@7238
   475
berghofe@7320
   476
* HOL/Sum.thy: sum_case has been moved to HOL/Datatype;
wenzelm@7261
   477
wenzelm@7280
   478
* HOL/Univ.thy: infix syntax <*>, <+>, <**>, <+> eliminated and made
wenzelm@7280
   479
thus available for user theories;
wenzelm@7280
   480
wenzelm@7300
   481
* HOLCF/IOA/Sequents: renamed 'Cons' to 'Consq' to avoid clash with
wenzelm@7300
   482
HOL/List; hardly an INCOMPATIBILITY since '>>' syntax is used all the
wenzelm@7300
   483
time;
wenzelm@7300
   484
wenzelm@7986
   485
* HOL: new tactic smp_tac: int -> int -> tactic, which applies spec
wenzelm@7986
   486
several times and then mp;
oheimb@7492
   487
wenzelm@7215
   488
paulson@7113
   489
*** LK ***
paulson@7113
   490
wenzelm@7215
   491
* the notation <<...>> is now available as a notation for sequences of
wenzelm@7215
   492
formulas;
paulson@7113
   493
paulson@7113
   494
* the simplifier is now installed
paulson@7113
   495
wenzelm@8729
   496
* the axiom system has been generalized (thanks to Soren Heilmann)
paulson@7113
   497
paulson@7113
   498
* the classical reasoner now has a default rule database
paulson@7113
   499
paulson@7113
   500
paulson@6064
   501
*** ZF ***
paulson@6064
   502
paulson@6064
   503
* new primrec section allows primitive recursive functions to be given
wenzelm@6269
   504
directly (as in HOL) over datatypes and the natural numbers;
paulson@6064
   505
wenzelm@6269
   506
* new tactics induct_tac and exhaust_tac for induction (or case
wenzelm@6269
   507
analysis) over datatypes and the natural numbers;
paulson@6064
   508
paulson@6064
   509
* the datatype declaration of type T now defines the recursor T_rec;
paulson@6064
   510
paulson@6141
   511
* simplification automatically does freeness reasoning for datatype
wenzelm@6269
   512
constructors;
paulson@6141
   513
wenzelm@6269
   514
* automatic type-inference, with AddTCs command to insert new
wenzelm@6269
   515
type-checking rules;
paulson@6155
   516
wenzelm@6269
   517
* datatype introduction rules are now added as Safe Introduction rules
wenzelm@6269
   518
to the claset;
paulson@6155
   519
wenzelm@6269
   520
* the syntax "if P then x else y" is now available in addition to
wenzelm@6269
   521
if(P,x,y);
wenzelm@6269
   522
paulson@6069
   523
wenzelm@6343
   524
*** Internal programming interfaces ***
wenzelm@6343
   525
wenzelm@7919
   526
* tuned simplifier trace output; new flag debug_simp;
wenzelm@7919
   527
wenzelm@7420
   528
* structures Vartab / Termtab (instances of TableFun) offer efficient
wenzelm@7420
   529
tables indexed by indexname_ord / term_ord (compatible with aconv);
wenzelm@7420
   530
wenzelm@6386
   531
* AxClass.axclass_tac lost the theory argument;
wenzelm@6386
   532
wenzelm@6343
   533
* tuned current_goals_markers semantics: begin / end goal avoids
wenzelm@6343
   534
printing empty lines;
wenzelm@6343
   535
wenzelm@6343
   536
* removed prs and prs_fn hook, which was broken because it did not
wenzelm@6343
   537
include \n in its semantics, forcing writeln to add one
wenzelm@6343
   538
uncoditionally; replaced prs_fn by writeln_fn; consider std_output:
wenzelm@6343
   539
string -> unit if you really want to output text without newline;
wenzelm@6343
   540
wenzelm@6343
   541
* Symbol.output subject to print mode; INCOMPATIBILITY: defaults to
wenzelm@6343
   542
plain output, interface builders may have to enable 'isabelle_font'
wenzelm@6343
   543
mode to get Isabelle font glyphs as before;
wenzelm@6343
   544
wenzelm@6343
   545
* refined token_translation interface; INCOMPATIBILITY: output length
wenzelm@6343
   546
now of type real instead of int;
wenzelm@6343
   547
wenzelm@7196
   548
* theory loader actions may be traced via new ThyInfo.add_hook
wenzelm@7196
   549
interface (see src/Pure/Thy/thy_info.ML); example application: keep
wenzelm@7196
   550
your own database of information attached to *whole* theories -- as
wenzelm@7196
   551
opposed to intra-theory data slots offered via TheoryDataFun;
wenzelm@7196
   552
wenzelm@7647
   553
* proper handling of dangling sort hypotheses (at last!);
wenzelm@7647
   554
Thm.strip_shyps and Drule.strip_shyps_warning take care of removing
wenzelm@7647
   555
extra sort hypotheses that can be witnessed from the type signature;
wenzelm@7986
   556
the force_strip_shyps flag is gone, any remaining shyps are simply
wenzelm@7986
   557
left in the theorem (with a warning issued by strip_shyps_warning);
wenzelm@7647
   558
wenzelm@6343
   559
paulson@6064
   560
wenzelm@5781
   561
New in Isabelle98-1 (October 1998)
wenzelm@5781
   562
----------------------------------
wenzelm@5781
   563
wenzelm@5127
   564
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4842
   565
wenzelm@5726
   566
* several changes of automated proof tools;
wenzelm@5373
   567
wenzelm@5726
   568
* HOL: major changes to the inductive and datatype packages, including
wenzelm@5726
   569
some minor incompatibilities of theory syntax;
berghofe@5214
   570
wenzelm@5726
   571
* HOL: renamed r^-1 to 'converse' from 'inverse'; 'inj_onto' is now
wenzelm@5217
   572
called `inj_on';
paulson@5160
   573
nipkow@5275
   574
* HOL: removed duplicate thms in Arith:
nipkow@5275
   575
  less_imp_add_less  should be replaced by  trans_less_add1
nipkow@5275
   576
  le_imp_add_le      should be replaced by  trans_le_add1
paulson@5160
   577
wenzelm@5726
   578
* HOL: unary minus is now overloaded (new type constraints may be
wenzelm@5726
   579
required);
paulson@5490
   580
wenzelm@5726
   581
* HOL and ZF: unary minus for integers is now #- instead of #~.  In
wenzelm@5726
   582
ZF, expressions such as n#-1 must be changed to n#- 1, since #-1 is
wenzelm@5726
   583
now taken as an integer constant.
paulson@5541
   584
wenzelm@5726
   585
* Pure: ML function 'theory_of' renamed to 'theory';
wenzelm@5397
   586
wenzelm@5363
   587
wenzelm@5127
   588
*** Proof tools ***
nipkow@4880
   589
nipkow@5657
   590
* Simplifier:
nipkow@5657
   591
  1. Asm_full_simp_tac is now more aggressive.
nipkow@5657
   592
     1. It will sometimes reorient premises if that increases their power to
nipkow@5657
   593
        simplify.
nipkow@5657
   594
     2. It does no longer proceed strictly from left to right but may also
nipkow@5657
   595
        rotate premises to achieve further simplification.
nipkow@5657
   596
     For compatibility reasons there is now Asm_lr_simp_tac which is like the
nipkow@5657
   597
     old Asm_full_simp_tac in that it does not rotate premises.
nipkow@5657
   598
  2. The simplifier now knows a little bit about nat-arithmetic.
nipkow@4880
   599
wenzelm@5127
   600
* Classical reasoner: wrapper mechanism for the classical reasoner now
wenzelm@5127
   601
allows for selected deletion of wrappers, by introduction of names for
wenzelm@5127
   602
wrapper functionals.  This implies that addbefore, addSbefore,
wenzelm@5127
   603
addaltern, and addSaltern now take a pair (name, tactic) as argument,
wenzelm@5127
   604
and that adding two tactics with the same name overwrites the first
wenzelm@5127
   605
one (emitting a warning).
oheimb@4824
   606
  type wrapper = (int -> tactic) -> (int -> tactic)
oheimb@4649
   607
  setWrapper, setSWrapper, compWrapper and compSWrapper are replaced by
oheimb@4824
   608
  addWrapper, addSWrapper: claset * (string * wrapper) -> claset
oheimb@4824
   609
  delWrapper, delSWrapper: claset *  string            -> claset
oheimb@4649
   610
  getWrapper is renamed to appWrappers, getSWrapper to appSWrappers;
oheimb@4649
   611
wenzelm@5705
   612
* Classical reasoner: addbefore/addSbefore now have APPEND/ORELSE
wenzelm@5726
   613
semantics; addbefore now affects only the unsafe part of step_tac
wenzelm@5726
   614
etc.; this affects addss/auto_tac/force_tac, so EXISTING PROOFS MAY
wenzelm@5726
   615
FAIL, but proofs should be fixable easily, e.g. by replacing Auto_tac
wenzelm@5726
   616
by Force_tac;
oheimb@5524
   617
wenzelm@5726
   618
* Classical reasoner: setwrapper to setWrapper and compwrapper to
wenzelm@5726
   619
compWrapper; added safe wrapper (and access functions for it);
oheimb@5524
   620
wenzelm@5127
   621
* HOL/split_all_tac is now much faster and fails if there is nothing
wenzelm@5726
   622
to split.  Some EXISTING PROOFS MAY REQUIRE ADAPTION because the order
wenzelm@5726
   623
and the names of the automatically generated variables have changed.
wenzelm@5726
   624
split_all_tac has moved within claset() from unsafe wrappers to safe
wenzelm@5726
   625
wrappers, which means that !!-bound variables are split much more
wenzelm@5726
   626
aggressively, and safe_tac and clarify_tac now split such variables.
wenzelm@5726
   627
If this splitting is not appropriate, use delSWrapper "split_all_tac".
wenzelm@5726
   628
Note: the same holds for record_split_tac, which does the job of
wenzelm@5726
   629
split_all_tac for record fields.
wenzelm@5127
   630
wenzelm@5726
   631
* HOL/Simplifier: Rewrite rules for case distinctions can now be added
wenzelm@5726
   632
permanently to the default simpset using Addsplits just like
wenzelm@5726
   633
Addsimps. They can be removed via Delsplits just like
wenzelm@5726
   634
Delsimps. Lower-case versions are also available.
wenzelm@5127
   635
wenzelm@5726
   636
* HOL/Simplifier: The rule split_if is now part of the default
wenzelm@5726
   637
simpset. This means that the simplifier will eliminate all occurrences
wenzelm@5726
   638
of if-then-else in the conclusion of a goal. To prevent this, you can
wenzelm@5726
   639
either remove split_if completely from the default simpset by
wenzelm@5726
   640
`Delsplits [split_if]' or remove it in a specific call of the
wenzelm@5726
   641
simplifier using `... delsplits [split_if]'.  You can also add/delete
wenzelm@5726
   642
other case splitting rules to/from the default simpset: every datatype
wenzelm@5726
   643
generates suitable rules `split_t_case' and `split_t_case_asm' (where
wenzelm@5726
   644
t is the name of the datatype).
wenzelm@5127
   645
wenzelm@5726
   646
* Classical reasoner / Simplifier combination: new force_tac (and
wenzelm@5127
   647
derivatives Force_tac, force) combines rewriting and classical
wenzelm@5127
   648
reasoning (and whatever other tools) similarly to auto_tac, but is
wenzelm@5726
   649
aimed to solve the given subgoal completely.
wenzelm@5127
   650
wenzelm@5127
   651
wenzelm@5127
   652
*** General ***
wenzelm@5127
   653
wenzelm@5217
   654
* new top-level commands `Goal' and `Goalw' that improve upon `goal'
wenzelm@5127
   655
and `goalw': the theory is no longer needed as an explicit argument -
wenzelm@5127
   656
the current theory context is used; assumptions are no longer returned
wenzelm@5127
   657
at the ML-level unless one of them starts with ==> or !!; it is
wenzelm@5217
   658
recommended to convert to these new commands using isatool fixgoal
wenzelm@5217
   659
(backup your sources first!);
wenzelm@4842
   660
wenzelm@5217
   661
* new top-level commands 'thm' and 'thms' for retrieving theorems from
wenzelm@5207
   662
the current theory context, and 'theory' to lookup stored theories;
paulson@4806
   663
paulson@5722
   664
* new theory section 'locale' for declaring constants, assumptions and
paulson@5722
   665
definitions that have local scope;
paulson@5722
   666
wenzelm@5127
   667
* new theory section 'nonterminals' for purely syntactic types;
wenzelm@4858
   668
wenzelm@5127
   669
* new theory section 'setup' for generic ML setup functions
wenzelm@5127
   670
(e.g. package initialization);
wenzelm@4869
   671
wenzelm@5131
   672
* the distribution now includes Isabelle icons: see
wenzelm@5131
   673
lib/logo/isabelle-{small,tiny}.xpm;
wenzelm@5131
   674
wenzelm@5363
   675
* isatool install - install binaries with absolute references to
wenzelm@5363
   676
ISABELLE_HOME/bin;
wenzelm@5363
   677
wenzelm@5572
   678
* isatool logo -- create instances of the Isabelle logo (as EPS);
wenzelm@5572
   679
wenzelm@5407
   680
* print mode 'emacs' reserved for Isamode;
wenzelm@5407
   681
wenzelm@5726
   682
* support multiple print (ast) translations per constant name;
wenzelm@5726
   683
wenzelm@6925
   684
* theorems involving oracles are now printed with a suffixed [!];
wenzelm@6925
   685
wenzelm@4711
   686
paulson@4661
   687
*** HOL ***
paulson@4661
   688
wenzelm@5710
   689
* there is now a tutorial on Isabelle/HOL (do 'isatool doc tutorial');
nipkow@5709
   690
wenzelm@5217
   691
* HOL/inductive package reorganized and improved: now supports mutual
paulson@5267
   692
definitions such as
wenzelm@5217
   693
wenzelm@5217
   694
  inductive EVEN ODD
wenzelm@5217
   695
    intrs
wenzelm@5217
   696
      null "0 : EVEN"
wenzelm@5217
   697
      oddI "n : EVEN ==> Suc n : ODD"
wenzelm@5217
   698
      evenI "n : ODD ==> Suc n : EVEN"
wenzelm@5217
   699
wenzelm@5217
   700
new theorem list "elims" contains an elimination rule for each of the
wenzelm@5217
   701
recursive sets; inductive definitions now handle disjunctive premises
wenzelm@5217
   702
correctly (also ZF);
berghofe@5214
   703
wenzelm@5217
   704
INCOMPATIBILITIES: requires Inductive as an ancestor; component
wenzelm@5217
   705
"mutual_induct" no longer exists - the induction rule is always
wenzelm@5217
   706
contained in "induct";
wenzelm@5217
   707
wenzelm@5217
   708
wenzelm@5217
   709
* HOL/datatype package re-implemented and greatly improved: now
paulson@5267
   710
supports mutually recursive datatypes such as
wenzelm@5217
   711
wenzelm@5217
   712
  datatype
wenzelm@5217
   713
    'a aexp = IF_THEN_ELSE ('a bexp) ('a aexp) ('a aexp)
wenzelm@5217
   714
            | SUM ('a aexp) ('a aexp)
wenzelm@5217
   715
            | DIFF ('a aexp) ('a aexp)
wenzelm@5217
   716
            | NUM 'a
wenzelm@5217
   717
  and
wenzelm@5217
   718
    'a bexp = LESS ('a aexp) ('a aexp)
wenzelm@5217
   719
            | AND ('a bexp) ('a bexp)
wenzelm@5217
   720
            | OR ('a bexp) ('a bexp)
wenzelm@5217
   721
paulson@5267
   722
as well as indirectly recursive datatypes such as
berghofe@5214
   723
wenzelm@5217
   724
  datatype
wenzelm@5217
   725
    ('a, 'b) term = Var 'a
wenzelm@5217
   726
                  | App 'b ((('a, 'b) term) list)
berghofe@5214
   727
wenzelm@5217
   728
The new tactic  mutual_induct_tac [<var_1>, ..., <var_n>] i  performs
wenzelm@5217
   729
induction on mutually / indirectly recursive datatypes.
wenzelm@5217
   730
wenzelm@5217
   731
Primrec equations are now stored in theory and can be accessed via
wenzelm@5217
   732
<function_name>.simps.
wenzelm@5217
   733
wenzelm@5217
   734
INCOMPATIBILITIES:
berghofe@5214
   735
wenzelm@5217
   736
  - Theories using datatypes must now have theory Datatype as an
wenzelm@5217
   737
    ancestor.
wenzelm@5217
   738
  - The specific <typename>.induct_tac no longer exists - use the
wenzelm@5217
   739
    generic induct_tac instead.
berghofe@5226
   740
  - natE has been renamed to nat.exhaust - use exhaust_tac
wenzelm@5217
   741
    instead of res_inst_tac ... natE. Note that the variable
berghofe@5226
   742
    names in nat.exhaust differ from the names in natE, this
wenzelm@5217
   743
    may cause some "fragile" proofs to fail.
wenzelm@5217
   744
  - The theorems split_<typename>_case and split_<typename>_case_asm
wenzelm@5217
   745
    have been renamed to <typename>.split and <typename>.split_asm.
wenzelm@5217
   746
  - Since default sorts of type variables are now handled correctly,
wenzelm@5217
   747
    some datatype definitions may have to be annotated with explicit
wenzelm@5217
   748
    sort constraints.
wenzelm@5217
   749
  - Primrec definitions no longer require function name and type
wenzelm@5217
   750
    of recursive argument.
berghofe@5214
   751
wenzelm@5217
   752
Consider using isatool fixdatatype to adapt your theories and proof
wenzelm@5217
   753
scripts to the new package (backup your sources first!).
wenzelm@5217
   754
wenzelm@5217
   755
wenzelm@5726
   756
* HOL/record package: considerably improved implementation; now
wenzelm@5726
   757
includes concrete syntax for record types, terms, updates; theorems
wenzelm@5726
   758
for surjective pairing and splitting !!-bound record variables; proof
wenzelm@5726
   759
support is as follows:
wenzelm@5726
   760
wenzelm@5726
   761
  1) standard conversions (selectors or updates applied to record
wenzelm@5726
   762
constructor terms) are part of the standard simpset;
wenzelm@5726
   763
wenzelm@5726
   764
  2) inject equations of the form ((x, y) = (x', y')) == x=x' & y=y' are
wenzelm@5726
   765
made part of standard simpset and claset via addIffs;
wenzelm@5726
   766
wenzelm@5726
   767
  3) a tactic for record field splitting (record_split_tac) is part of
wenzelm@5726
   768
the standard claset (addSWrapper);
wenzelm@5726
   769
wenzelm@5726
   770
To get a better idea about these rules you may retrieve them via
wenzelm@5726
   771
something like 'thms "foo.simps"' or 'thms "foo.iffs"', where "foo" is
wenzelm@5726
   772
the name of your record type.
wenzelm@5726
   773
wenzelm@5726
   774
The split tactic 3) conceptually simplifies by the following rule:
wenzelm@5726
   775
wenzelm@5726
   776
  "(!!x. PROP ?P x) == (!!a b. PROP ?P (a, b))"
wenzelm@5726
   777
wenzelm@5726
   778
Thus any record variable that is bound by meta-all will automatically
wenzelm@5726
   779
blow up into some record constructor term, consequently the
wenzelm@5726
   780
simplifications of 1), 2) apply.  Thus force_tac, auto_tac etc. shall
wenzelm@5726
   781
solve record problems automatically.
wenzelm@5726
   782
berghofe@5214
   783
wenzelm@5125
   784
* reorganized the main HOL image: HOL/Integ and String loaded by
wenzelm@5125
   785
default; theory Main includes everything;
wenzelm@5125
   786
paulson@5650
   787
* automatic simplification of integer sums and comparisons, using cancellation;
paulson@5650
   788
oheimb@5526
   789
* added option_map_eq_Some and not_Some_eq to the default simpset and claset;
wenzelm@5127
   790
wenzelm@5127
   791
* added disj_not1 = "(~P | Q) = (P --> Q)" to the default simpset;
wenzelm@5127
   792
wenzelm@5127
   793
* many new identities for unions, intersections, set difference, etc.;
wenzelm@5127
   794
wenzelm@5127
   795
* expand_if, expand_split, expand_sum_case and expand_nat_case are now
wenzelm@5127
   796
called split_if, split_split, split_sum_case and split_nat_case (to go
wenzelm@5127
   797
with add/delsplits);
wenzelm@5125
   798
wenzelm@5127
   799
* HOL/Prod introduces simplification procedure unit_eq_proc rewriting
wenzelm@5127
   800
(?x::unit) = (); this is made part of the default simpset, which COULD
wenzelm@5127
   801
MAKE EXISTING PROOFS FAIL under rare circumstances (consider
wenzelm@5207
   802
'Delsimprocs [unit_eq_proc];' as last resort); also note that
wenzelm@5207
   803
unit_abs_eta_conv is added in order to counter the effect of
wenzelm@5207
   804
unit_eq_proc on (%u::unit. f u), replacing it by f rather than by
wenzelm@5207
   805
%u.f();
wenzelm@5125
   806
wenzelm@5217
   807
* HOL/Fun INCOMPATIBILITY: `inj_onto' is now called `inj_on' (which
wenzelm@5217
   808
makes more sense);
berghofe@5109
   809
paulson@5475
   810
* HOL/Set INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
   811
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
   812
  disjointness reasoning but breaking a few old proofs.
paulson@5267
   813
wenzelm@5217
   814
* HOL/Relation INCOMPATIBILITY: renamed the relational operator r^-1
wenzelm@5217
   815
to 'converse' from 'inverse' (for compatibility with ZF and some
wenzelm@5217
   816
literature);
wenzelm@5085
   817
wenzelm@5127
   818
* HOL/recdef can now declare non-recursive functions, with {} supplied as
wenzelm@5127
   819
the well-founded relation;
oheimb@4838
   820
paulson@5490
   821
* HOL/Set INCOMPATIBILITY: the complement of set A is now written -A instead of
paulson@5490
   822
    Compl A.  The "Compl" syntax remains available as input syntax for this
paulson@5490
   823
    release ONLY.
paulson@5490
   824
wenzelm@5127
   825
* HOL/Update: new theory of function updates:
wenzelm@5127
   826
    f(a:=b) == %x. if x=a then b else f x
wenzelm@5127
   827
may also be iterated as in f(a:=b,c:=d,...);
nipkow@5077
   828
wenzelm@5127
   829
* HOL/Vimage: new theory for inverse image of a function, syntax f-``B;
paulson@4899
   830
nipkow@5282
   831
* HOL/List:
nipkow@5282
   832
  - new function list_update written xs[i:=v] that updates the i-th
nipkow@5282
   833
    list position. May also be iterated as in xs[i:=a,j:=b,...].
nipkow@5428
   834
  - new function `upt' written [i..j(] which generates the list
nipkow@5428
   835
    [i,i+1,...,j-1], i.e. the upper bound is excluded. To include the upper
nipkow@5428
   836
    bound write [i..j], which is a shorthand for [i..j+1(].
nipkow@5282
   837
  - new lexicographic orderings and corresponding wellfoundedness theorems.
paulson@4779
   838
wenzelm@5127
   839
* HOL/Arith:
wenzelm@5127
   840
  - removed 'pred' (predecessor) function;
wenzelm@5127
   841
  - generalized some theorems about n-1;
wenzelm@5127
   842
  - many new laws about "div" and "mod";
wenzelm@5127
   843
  - new laws about greatest common divisors (see theory ex/Primes);
oheimb@4766
   844
wenzelm@5127
   845
* HOL/Relation: renamed the relational operator r^-1 "converse"
wenzelm@4842
   846
instead of "inverse";
wenzelm@4711
   847
nipkow@5651
   848
* HOL/Induct/Multiset: a theory of multisets, including the wellfoundedness
nipkow@5651
   849
  of the multiset ordering;
nipkow@5651
   850
wenzelm@5127
   851
* directory HOL/Real: a construction of the reals using Dedekind cuts
nipkow@5651
   852
  (not included by default);
nipkow@4835
   853
wenzelm@5127
   854
* directory HOL/UNITY: Chandy and Misra's UNITY formalism;
wenzelm@4711
   855
nipkow@5651
   856
* directory HOL/Hoare: a new version of Hoare logic which permits many-sorted
nipkow@5651
   857
  programs, i.e. different program variables may have different types.
nipkow@5651
   858
paulson@5142
   859
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
   860
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
   861
  Now rew can involve either definitions or equalities (either == or =).
wenzelm@5002
   862
wenzelm@5363
   863
paulson@4879
   864
*** ZF ***
paulson@4879
   865
paulson@5332
   866
* theory Main includes everything; INCOMPATIBILITY: theory ZF.thy contains
paulson@5332
   867
  only the theorems proved on ZF.ML;
paulson@5160
   868
paulson@5475
   869
* ZF INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
   870
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
   871
  disjointness reasoning but breaking a few old proofs.
paulson@5267
   872
paulson@5160
   873
* ZF/Update: new theory of function updates
paulson@5160
   874
    with default rewrite rule  f(x:=y) ` z = if(z=x, y, f`z)
paulson@5160
   875
  may also be iterated as in f(a:=b,c:=d,...);
paulson@5160
   876
paulson@4879
   877
* in  let x=t in u(x), neither t nor u(x) has to be an FOL term.
oheimb@4649
   878
paulson@5142
   879
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
   880
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
   881
  Now rew can involve either definitions or equalities (either == or =).
paulson@5142
   882
paulson@5160
   883
* case_tac provided for compatibility with HOL
paulson@5160
   884
    (like the old excluded_middle_tac, but with subgoals swapped)
paulson@5160
   885
wenzelm@4842
   886
wenzelm@5127
   887
*** Internal programming interfaces ***
wenzelm@5002
   888
wenzelm@5251
   889
* Pure: several new basic modules made available for general use, see
wenzelm@5251
   890
also src/Pure/README;
wenzelm@5207
   891
wenzelm@5008
   892
* improved the theory data mechanism to support encapsulation (data
wenzelm@5008
   893
kind name replaced by private Object.kind, acting as authorization
wenzelm@5373
   894
key); new type-safe user interface via functor TheoryDataFun; generic
wenzelm@5373
   895
print_data function becomes basically useless;
wenzelm@5002
   896
wenzelm@5251
   897
* removed global_names compatibility flag -- all theory declarations
wenzelm@5251
   898
are qualified by default;
wenzelm@5251
   899
wenzelm@5085
   900
* module Pure/Syntax now offers quote / antiquote translation
wenzelm@5085
   901
functions (useful for Hoare logic etc. with implicit dependencies);
wenzelm@5373
   902
see HOL/ex/Antiquote for an example use;
wenzelm@5085
   903
wenzelm@5127
   904
* Simplifier now offers conversions (asm_)(full_)rewrite: simpset ->
wenzelm@5127
   905
cterm -> thm;
wenzelm@5127
   906
wenzelm@5207
   907
* new tactical CHANGED_GOAL for checking that a tactic modifies a
wenzelm@5207
   908
subgoal;
paulson@5142
   909
wenzelm@5251
   910
* Display.print_goals function moved to Locale.print_goals;
wenzelm@5251
   911
wenzelm@5731
   912
* standard print function for goals supports current_goals_markers
wenzelm@5731
   913
variable for marking begin of proof, end of proof, start of goal; the
wenzelm@5731
   914
default is ("", "", ""); setting current_goals_markers := ("<proof>",
wenzelm@5731
   915
"</proof>", "<goal>") causes SGML like tagged proof state printing,
wenzelm@5731
   916
for example;
wenzelm@5731
   917
wenzelm@5002
   918
wenzelm@5002
   919
wenzelm@4410
   920
New in Isabelle98 (January 1998)
wenzelm@4410
   921
--------------------------------
wenzelm@4410
   922
wenzelm@4410
   923
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4410
   924
wenzelm@4410
   925
* changed lexical syntax of terms / types: dots made part of long
wenzelm@4410
   926
identifiers, e.g. "%x.x" no longer possible, should be "%x. x";
wenzelm@4410
   927
wenzelm@4410
   928
* simpset (and claset) reference variable replaced by functions
wenzelm@4410
   929
simpset / simpset_ref;
wenzelm@4410
   930
wenzelm@4410
   931
* no longer supports theory aliases (via merge) and non-trivial
wenzelm@4410
   932
implicit merge of thms' signatures;
wenzelm@4410
   933
wenzelm@4410
   934
* most internal names of constants changed due to qualified names;
wenzelm@4410
   935
wenzelm@4410
   936
* changed Pure/Sequence interface (see Pure/seq.ML);
wenzelm@4410
   937
wenzelm@3454
   938
paulson@3715
   939
*** General Changes ***
paulson@3715
   940
wenzelm@4174
   941
* hierachically structured name spaces (for consts, types, axms, thms
wenzelm@3943
   942
etc.); new lexical class 'longid' (e.g. Foo.bar.x) may render much of
wenzelm@4108
   943
old input syntactically incorrect (e.g. "%x.x"); COMPATIBILITY:
wenzelm@4108
   944
isatool fixdots ensures space after dots (e.g. "%x. x"); set
wenzelm@4174
   945
long_names for fully qualified output names; NOTE: ML programs
wenzelm@4174
   946
(special tactics, packages etc.) referring to internal names may have
wenzelm@4174
   947
to be adapted to cope with fully qualified names; in case of severe
wenzelm@4174
   948
backward campatibility problems try setting 'global_names' at compile
wenzelm@4174
   949
time to have enrything declared within a flat name space; one may also
wenzelm@4174
   950
fine tune name declarations in theories via the 'global' and 'local'
wenzelm@4174
   951
section;
wenzelm@4108
   952
wenzelm@4108
   953
* reimplemented the implicit simpset and claset using the new anytype
wenzelm@4108
   954
data filed in signatures; references simpset:simpset ref etc. are
wenzelm@4108
   955
replaced by functions simpset:unit->simpset and
wenzelm@4108
   956
simpset_ref:unit->simpset ref; COMPATIBILITY: use isatool fixclasimp
wenzelm@4108
   957
to patch your ML files accordingly;
paulson@3856
   958
wenzelm@3857
   959
* HTML output now includes theory graph data for display with Java
wenzelm@3857
   960
applet or isatool browser; data generated automatically via isatool
wenzelm@3901
   961
usedir (see -i option, ISABELLE_USEDIR_OPTIONS);
wenzelm@3857
   962
paulson@3856
   963
* defs may now be conditional; improved rewrite_goals_tac to handle
paulson@3856
   964
conditional equations;
paulson@3856
   965
wenzelm@4174
   966
* defs now admits additional type arguments, using TYPE('a) syntax;
wenzelm@4174
   967
wenzelm@3901
   968
* theory aliases via merge (e.g. M=A+B+C) no longer supported, always
wenzelm@3901
   969
creates a new theory node; implicit merge of thms' signatures is
wenzelm@4112
   970
restricted to 'trivial' ones; COMPATIBILITY: one may have to use
wenzelm@3901
   971
transfer:theory->thm->thm in (rare) cases;
wenzelm@3901
   972
wenzelm@3968
   973
* improved handling of draft signatures / theories; draft thms (and
wenzelm@3968
   974
ctyps, cterms) are automatically promoted to real ones;
wenzelm@3968
   975
wenzelm@3901
   976
* slightly changed interfaces for oracles: admit many per theory, named
wenzelm@3901
   977
(e.g. oracle foo = mlfun), additional name argument for invoke_oracle;
wenzelm@3901
   978
wenzelm@3901
   979
* print_goals: optional output of const types (set show_consts and
wenzelm@3901
   980
show_types);
wenzelm@3851
   981
wenzelm@4388
   982
* improved output of warnings (###) and errors (***);
wenzelm@3697
   983
paulson@4178
   984
* subgoal_tac displays a warning if the new subgoal has type variables;
paulson@4178
   985
paulson@3715
   986
* removed old README and Makefiles;
wenzelm@3697
   987
paulson@3856
   988
* replaced print_goals_ref hook by print_current_goals_fn and result_error_fn;
wenzelm@3670
   989
paulson@3715
   990
* removed obsolete init_pps and init_database;
paulson@3715
   991
paulson@3715
   992
* deleted the obsolete tactical STATE, which was declared by
paulson@3715
   993
    fun STATE tacfun st = tacfun st st;
paulson@3715
   994
wenzelm@4388
   995
* cd and use now support path variables, e.g. $ISABELLE_HOME, or ~
wenzelm@4388
   996
(which abbreviates $HOME);
wenzelm@4269
   997
wenzelm@4269
   998
* changed Pure/Sequence interface (see Pure/seq.ML); COMPATIBILITY:
wenzelm@4269
   999
use isatool fixseq to adapt your ML programs (this works for fully
wenzelm@4269
  1000
qualified references to the Sequence structure only!);
wenzelm@4269
  1001
wenzelm@4381
  1002
* use_thy no longer requires writable current directory; it always
wenzelm@4381
  1003
reloads .ML *and* .thy file, if either one is out of date;
wenzelm@4269
  1004
paulson@3715
  1005
paulson@3715
  1006
*** Classical Reasoner ***
paulson@3715
  1007
wenzelm@3744
  1008
* Clarify_tac, clarify_tac, clarify_step_tac, Clarify_step_tac: new
wenzelm@3744
  1009
tactics that use classical reasoning to simplify a subgoal without
wenzelm@3744
  1010
splitting it into several subgoals;
paulson@3715
  1011
paulson@3719
  1012
* Safe_tac: like safe_tac but uses the default claset;
paulson@3719
  1013
paulson@3715
  1014
paulson@3715
  1015
*** Simplifier ***
paulson@3715
  1016
paulson@3715
  1017
* added simplification meta rules:
paulson@3715
  1018
    (asm_)(full_)simplify: simpset -> thm -> thm;
paulson@3715
  1019
paulson@3715
  1020
* simplifier.ML no longer part of Pure -- has to be loaded by object
paulson@3715
  1021
logics (again);
paulson@3715
  1022
paulson@3715
  1023
* added prems argument to simplification procedures;
paulson@3715
  1024
paulson@4325
  1025
* HOL, FOL, ZF: added infix function `addsplits':
paulson@4325
  1026
  instead of `<simpset> setloop (split_tac <thms>)'
paulson@4325
  1027
  you can simply write `<simpset> addsplits <thms>'
paulson@4325
  1028
paulson@3715
  1029
paulson@3715
  1030
*** Syntax ***
paulson@3715
  1031
wenzelm@4174
  1032
* TYPE('a) syntax for type reflection terms;
wenzelm@4174
  1033
wenzelm@3985
  1034
* no longer handles consts with name "" -- declare as 'syntax' instead;
paulson@3856
  1035
paulson@3856
  1036
* pretty printer: changed order of mixfix annotation preference (again!);
wenzelm@3846
  1037
paulson@3715
  1038
* Pure: fixed idt/idts vs. pttrn/pttrns syntactic categories;
paulson@3715
  1039
paulson@3715
  1040
paulson@3715
  1041
*** HOL ***
paulson@3715
  1042
wenzelm@5726
  1043
* HOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  1044
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
  1045
nipkow@4035
  1046
* HOL/TLA: Stephan Merz's formalization of Lamport's Temporal Logic of Actions;
wenzelm@3985
  1047
wenzelm@3985
  1048
* HOL/Auth: new protocol proofs including some for the Internet
nipkow@4035
  1049
  protocol TLS;
wenzelm@3985
  1050
wenzelm@4125
  1051
* HOL/Map: new theory of `maps' a la VDM;
nipkow@3982
  1052
wenzelm@4335
  1053
* HOL/simplifier: simplification procedures nat_cancel_sums for
wenzelm@4335
  1054
cancelling out common nat summands from =, <, <= (in)equalities, or
wenzelm@4335
  1055
differences; simplification procedures nat_cancel_factor for
wenzelm@4335
  1056
cancelling common factor from =, <, <= (in)equalities over natural
wenzelm@4373
  1057
sums; nat_cancel contains both kinds of procedures, it is installed by
wenzelm@4373
  1058
default in Arith.thy -- this COULD MAKE EXISTING PROOFS FAIL;
wenzelm@4335
  1059
nipkow@3580
  1060
* HOL/simplifier: terms of the form
paulson@4325
  1061
  `? x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x)'  (or t=x)
nipkow@3580
  1062
  are rewritten to
nipkow@4035
  1063
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t)',
nipkow@4035
  1064
  and those of the form
paulson@4325
  1065
  `! x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x) --> R(x)'  (or t=x)
nipkow@4035
  1066
  are rewritten to
nipkow@4035
  1067
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t) --> R(t)',
nipkow@4035
  1068
nipkow@4035
  1069
* HOL/datatype
nipkow@4035
  1070
  Each datatype `t' now comes with a theorem `split_t_case' of the form
nipkow@3580
  1071
nipkow@4035
  1072
  P(t_case f1 ... fn x) =
nipkow@4035
  1073
     ( (!y1 ... ym1. x = C1 y1 ... ym1 --> P(f1 y1 ... ym1)) &
nipkow@4035
  1074
        ...
oheimb@4189
  1075
       (!y1 ... ymn. x = Cn y1 ... ymn --> P(f1 y1 ... ymn))
nipkow@4035
  1076
     )
nipkow@4035
  1077
oheimb@4930
  1078
  and a theorem `split_t_case_asm' of the form
oheimb@4189
  1079
oheimb@4189
  1080
  P(t_case f1 ... fn x) =
oheimb@4189
  1081
    ~( (? y1 ... ym1. x = C1 y1 ... ym1 & ~P(f1 y1 ... ym1)) |
oheimb@4189
  1082
        ...
oheimb@4189
  1083
       (? y1 ... ymn. x = Cn y1 ... ymn & ~P(f1 y1 ... ymn))
oheimb@4189
  1084
     )
oheimb@4930
  1085
  which can be added to a simpset via `addsplits'. The existing theorems
oheimb@4930
  1086
  expand_list_case and expand_option_case have been renamed to
oheimb@4930
  1087
  split_list_case and split_option_case.
oheimb@4189
  1088
nipkow@4361
  1089
* HOL/Arithmetic:
nipkow@4361
  1090
  - `pred n' is automatically converted to `n-1'.
nipkow@4361
  1091
    Users are strongly encouraged not to use `pred' any longer,
nipkow@4361
  1092
    because it will disappear altogether at some point.
nipkow@4361
  1093
  - Users are strongly encouraged to write "0 < n" rather than
nipkow@4361
  1094
    "n ~= 0". Theorems and proof tools have been modified towards this
nipkow@4361
  1095
    `standard'.
nipkow@4357
  1096
nipkow@4502
  1097
* HOL/Lists:
nipkow@4502
  1098
  the function "set_of_list" has been renamed "set" (and its theorems too);
nipkow@4502
  1099
  the function "nth" now takes its arguments in the reverse order and
nipkow@4502
  1100
  has acquired the infix notation "!" as in "xs!n".
paulson@3570
  1101
paulson@4154
  1102
* HOL/Set: UNIV is now a constant and is no longer translated to Compl{};
paulson@4154
  1103
paulson@4154
  1104
* HOL/Set: The operator (UN x.B x) now abbreviates (UN x:UNIV. B x) and its
paulson@4154
  1105
  specialist theorems (like UN1_I) are gone.  Similarly for (INT x.B x);
paulson@4154
  1106
wenzelm@4575
  1107
* HOL/record: extensible records with schematic structural subtyping
wenzelm@4575
  1108
(single inheritance); EXPERIMENTAL version demonstrating the encoding,
wenzelm@4575
  1109
still lacks various theorems and concrete record syntax;
wenzelm@4575
  1110
wenzelm@4125
  1111
paulson@3715
  1112
*** HOLCF ***
wenzelm@3535
  1113
wenzelm@4125
  1114
* removed "axioms" and "generated by" sections;
wenzelm@4125
  1115
oheimb@4123
  1116
* replaced "ops" section by extended "consts" section, which is capable of
wenzelm@4125
  1117
  handling the continuous function space "->" directly;
wenzelm@4125
  1118
wenzelm@4125
  1119
* domain package:
wenzelm@4125
  1120
  . proves theorems immediately and stores them in the theory,
wenzelm@4125
  1121
  . creates hierachical name space,
wenzelm@4125
  1122
  . now uses normal mixfix annotations (instead of cinfix...),
wenzelm@4125
  1123
  . minor changes to some names and values (for consistency),
wenzelm@4125
  1124
  . e.g. cases -> casedist, dists_eq -> dist_eqs, [take_lemma] -> take_lemmas,
wenzelm@4125
  1125
  . separator between mutual domain defs: changed "," to "and",
wenzelm@4125
  1126
  . improved handling of sort constraints;  now they have to
wenzelm@4125
  1127
    appear on the left-hand side of the equations only;
oheimb@4123
  1128
oheimb@4123
  1129
* fixed LAM <x,y,zs>.b syntax;
wenzelm@3567
  1130
wenzelm@3744
  1131
* added extended adm_tac to simplifier in HOLCF -- can now discharge
wenzelm@3744
  1132
adm (%x. P (t x)), where P is chainfinite and t continuous;
wenzelm@3579
  1133
wenzelm@3579
  1134
paulson@3719
  1135
*** FOL and ZF ***
paulson@3719
  1136
wenzelm@5726
  1137
* FOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  1138
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
  1139
wenzelm@3744
  1140
* qed_spec_mp, qed_goal_spec_mp, qed_goalw_spec_mp are available, as
wenzelm@3744
  1141
in HOL, they strip ALL and --> from proved theorems;
wenzelm@3744
  1142
paulson@3719
  1143
wenzelm@3579
  1144
wenzelm@3006
  1145
New in Isabelle94-8 (May 1997)
wenzelm@3006
  1146
------------------------------
wenzelm@2654
  1147
paulson@3002
  1148
*** General Changes ***
paulson@3002
  1149
paulson@3002
  1150
* new utilities to build / run / maintain Isabelle etc. (in parts
paulson@3002
  1151
still somewhat experimental); old Makefiles etc. still functional;
wenzelm@2971
  1152
wenzelm@3205
  1153
* new 'Isabelle System Manual';
wenzelm@3205
  1154
wenzelm@2825
  1155
* INSTALL text, together with ./configure and ./build scripts;
wenzelm@2773
  1156
wenzelm@3006
  1157
* reimplemented type inference for greater efficiency, better error
wenzelm@3006
  1158
messages and clean internal interface;
paulson@3002
  1159
paulson@3002
  1160
* prlim command for dealing with lots of subgoals (an easier way of
paulson@3002
  1161
setting goals_limit);
paulson@3002
  1162
wenzelm@3006
  1163
wenzelm@3006
  1164
*** Syntax ***
paulson@3002
  1165
wenzelm@3116
  1166
* supports alternative (named) syntax tables (parser and pretty
wenzelm@3116
  1167
printer); internal interface is provided by add_modesyntax(_i);
wenzelm@3116
  1168
paulson@3002
  1169
* Pure, FOL, ZF, HOL, HOLCF now support symbolic input and output; to
paulson@3002
  1170
be used in conjunction with the Isabelle symbol font; uses the
paulson@3002
  1171
"symbols" syntax table;
paulson@3002
  1172
wenzelm@2705
  1173
* added token_translation interface (may translate name tokens in
wenzelm@2756
  1174
arbitrary ways, dependent on their type (free, bound, tfree, ...) and
wenzelm@3116
  1175
the current print_mode); IMPORTANT: user print translation functions
wenzelm@3116
  1176
are responsible for marking newly introduced bounds
wenzelm@3116
  1177
(Syntax.mark_boundT);
wenzelm@2705
  1178
wenzelm@2730
  1179
* token translations for modes "xterm" and "xterm_color" that display
wenzelm@3006
  1180
names in bold, underline etc. or colors (which requires a color
wenzelm@3006
  1181
version of xterm);
wenzelm@2730
  1182
paulson@3002
  1183
* infixes may now be declared with names independent of their syntax;
paulson@3002
  1184
paulson@3002
  1185
* added typed_print_translation (like print_translation, but may
paulson@3002
  1186
access type of constant);
paulson@3002
  1187
wenzelm@3006
  1188
paulson@3002
  1189
*** Classical Reasoner ***
paulson@3002
  1190
paulson@3002
  1191
Blast_tac: a new tactic!  It is often more powerful than fast_tac, but has
paulson@3002
  1192
some limitations.  Blast_tac...
paulson@3002
  1193
  + ignores addss, addbefore, addafter; this restriction is intrinsic
paulson@3002
  1194
  + ignores elimination rules that don't have the correct format
wenzelm@5726
  1195
        (the conclusion MUST be a formula variable)
paulson@3002
  1196
  + ignores types, which can make HOL proofs fail
paulson@3002
  1197
  + rules must not require higher-order unification, e.g. apply_type in ZF
paulson@3002
  1198
    [message "Function Var's argument not a bound variable" relates to this]
paulson@3002
  1199
  + its proof strategy is more general but can actually be slower
paulson@3002
  1200
wenzelm@3107
  1201
* substitution with equality assumptions no longer permutes other
wenzelm@3107
  1202
assumptions;
paulson@3002
  1203
paulson@3002
  1204
* minor changes in semantics of addafter (now called addaltern); renamed
paulson@3002
  1205
setwrapper to setWrapper and compwrapper to compWrapper; added safe wrapper
wenzelm@3107
  1206
(and access functions for it);
paulson@3002
  1207
wenzelm@5726
  1208
* improved combination of classical reasoner and simplifier:
oheimb@3317
  1209
  + functions for handling clasimpsets
oheimb@3317
  1210
  + improvement of addss: now the simplifier is called _after_ the
oheimb@3317
  1211
    safe steps.
oheimb@3317
  1212
  + safe variant of addss called addSss: uses safe simplifications
wenzelm@5726
  1213
    _during_ the safe steps. It is more complete as it allows multiple
oheimb@3317
  1214
    instantiations of unknowns (e.g. with slow_tac).
wenzelm@3006
  1215
paulson@3002
  1216
*** Simplifier ***
paulson@3002
  1217
wenzelm@3006
  1218
* added interface for simplification procedures (functions that
wenzelm@3006
  1219
produce *proven* rewrite rules on the fly, depending on current
wenzelm@3006
  1220
redex);
wenzelm@3006
  1221
wenzelm@3006
  1222
* ordering on terms as parameter (used for ordered rewriting);
wenzelm@3006
  1223
wenzelm@3107
  1224
* new functions delcongs, deleqcongs, and Delcongs. richer rep_ss;
paulson@3002
  1225
paulson@3002
  1226
* the solver is now split into a safe and an unsafe part.
paulson@3002
  1227
This should be invisible for the normal user, except that the
paulson@3002
  1228
functions setsolver and addsolver have been renamed to setSolver and
wenzelm@3107
  1229
addSolver; added safe_asm_full_simp_tac;
paulson@3002
  1230
paulson@3002
  1231
paulson@3002
  1232
*** HOL ***
paulson@3002
  1233
nipkow@3042
  1234
* a generic induction tactic `induct_tac' which works for all datatypes and
wenzelm@3107
  1235
also for type `nat';
nipkow@3042
  1236
nipkow@3316
  1237
* a generic case distinction tactic `exhaust_tac' which works for all
nipkow@3316
  1238
datatypes and also for type `nat';
nipkow@3316
  1239
nipkow@3316
  1240
* each datatype comes with a function `size';
nipkow@3316
  1241
paulson@3002
  1242
* patterns in case expressions allow tuple patterns as arguments to
wenzelm@3107
  1243
constructors, for example `case x of [] => ... | (x,y,z)#ps => ...';
paulson@3002
  1244
paulson@3002
  1245
* primrec now also works with type nat;
paulson@3002
  1246
paulson@3338
  1247
* recdef: a new declaration form, allows general recursive functions to be
paulson@3338
  1248
defined in theory files.  See HOL/ex/Fib, HOL/ex/Primes, HOL/Subst/Unify.
paulson@3338
  1249
paulson@3002
  1250
* the constant for negation has been renamed from "not" to "Not" to
wenzelm@3107
  1251
harmonize with FOL, ZF, LK, etc.;
paulson@3002
  1252
wenzelm@3107
  1253
* HOL/ex/LFilter theory of a corecursive "filter" functional for
wenzelm@3107
  1254
infinite lists;
paulson@3002
  1255
wenzelm@3227
  1256
* HOL/Modelcheck demonstrates invocation of model checker oracle;
wenzelm@3227
  1257
paulson@3002
  1258
* HOL/ex/Ring.thy declares cring_simp, which solves equational
paulson@3002
  1259
problems in commutative rings, using axiomatic type classes for + and *;
paulson@3002
  1260
paulson@3002
  1261
* more examples in HOL/MiniML and HOL/Auth;
paulson@3002
  1262
paulson@3002
  1263
* more default rewrite rules for quantifiers, union/intersection;
paulson@3002
  1264
nipkow@3321
  1265
* a new constant `arbitrary == @x.False';
nipkow@3321
  1266
wenzelm@3107
  1267
* HOLCF/IOA replaces old HOL/IOA;
wenzelm@3107
  1268
wenzelm@5726
  1269
* HOLCF changes: derived all rules and arities
wenzelm@5726
  1270
  + axiomatic type classes instead of classes
slotosch@2653
  1271
  + typedef instead of faking type definitions
paulson@2747
  1272
  + eliminated the internal constants less_fun, less_cfun, UU_fun, UU_cfun etc.
wenzelm@2730
  1273
  + new axclasses cpo, chfin, flat with flat < chfin < pcpo < cpo < po
slotosch@2653
  1274
  + eliminated the types void, one, tr
slotosch@2653
  1275
  + use unit lift and bool lift (with translations) instead of one and tr
slotosch@2653
  1276
  + eliminated blift from Lift3.thy (use Def instead of blift)
wenzelm@3107
  1277
  all eliminated rules are derived as theorems --> no visible changes ;
oheimb@2649
  1278
wenzelm@3006
  1279
paulson@3002
  1280
*** ZF ***
wenzelm@2553
  1281
paulson@2865
  1282
* ZF now has Fast_tac, Simp_tac and Auto_tac.  Union_iff is a now a default
paulson@2865
  1283
rewrite rule; this may affect some proofs.  eq_cs is gone but can be put back
paulson@2865
  1284
as ZF_cs addSIs [equalityI];
wenzelm@2553
  1285
wenzelm@2554
  1286
wenzelm@2732
  1287
wenzelm@2553
  1288
New in Isabelle94-7 (November 96)
wenzelm@2553
  1289
---------------------------------
wenzelm@2553
  1290
wenzelm@2553
  1291
* allowing negative levels (as offsets) in prlev and choplev;
wenzelm@2553
  1292
wenzelm@2554
  1293
* super-linear speedup for large simplifications;
wenzelm@2554
  1294
wenzelm@2554
  1295
* FOL, ZF and HOL now use miniscoping: rewriting pushes
wenzelm@2554
  1296
quantifications in as far as possible (COULD MAKE EXISTING PROOFS
wenzelm@2554
  1297
FAIL); can suppress it using the command Delsimps (ex_simps @
wenzelm@2554
  1298
all_simps); De Morgan laws are also now included, by default;
wenzelm@2554
  1299
wenzelm@2554
  1300
* improved printing of ==>  :  ~:
wenzelm@2554
  1301
wenzelm@2554
  1302
* new object-logic "Sequents" adds linear logic, while replacing LK
wenzelm@2554
  1303
and Modal (thanks to Sara Kalvala);
wenzelm@2554
  1304
wenzelm@2554
  1305
* HOL/Auth: correctness proofs for authentication protocols;
wenzelm@2554
  1306
wenzelm@2554
  1307
* HOL: new auto_tac combines rewriting and classical reasoning (many
wenzelm@2554
  1308
examples on HOL/Auth);
wenzelm@2554
  1309
wenzelm@2554
  1310
* HOL: new command AddIffs for declaring theorems of the form P=Q to
wenzelm@2554
  1311
the rewriter and classical reasoner simultaneously;
wenzelm@2554
  1312
wenzelm@2554
  1313
* function uresult no longer returns theorems in "standard" format;
wenzelm@2554
  1314
regain previous version by: val uresult = standard o uresult;
wenzelm@2554
  1315
wenzelm@2554
  1316
wenzelm@2554
  1317
wenzelm@2554
  1318
New in Isabelle94-6
wenzelm@2554
  1319
-------------------
wenzelm@2554
  1320
wenzelm@2554
  1321
* oracles -- these establish an interface between Isabelle and trusted
wenzelm@2554
  1322
external reasoners, which may deliver results as theorems;
wenzelm@2554
  1323
wenzelm@2554
  1324
* proof objects (in particular record all uses of oracles);
wenzelm@2554
  1325
wenzelm@2554
  1326
* Simp_tac, Fast_tac, etc. that refer to implicit simpset / claset;
wenzelm@2554
  1327
wenzelm@2554
  1328
* "constdefs" section in theory files;
wenzelm@2554
  1329
wenzelm@2554
  1330
* "primrec" section (HOL) no longer requires names;
wenzelm@2554
  1331
wenzelm@2554
  1332
* internal type "tactic" now simply "thm -> thm Sequence.seq";
wenzelm@2554
  1333
wenzelm@2554
  1334
wenzelm@2554
  1335
wenzelm@2554
  1336
New in Isabelle94-5
wenzelm@2554
  1337
-------------------
wenzelm@2554
  1338
wenzelm@2554
  1339
* reduced space requirements;
wenzelm@2554
  1340
wenzelm@2554
  1341
* automatic HTML generation from theories;
wenzelm@2554
  1342
wenzelm@2554
  1343
* theory files no longer require "..." (quotes) around most types;
wenzelm@2554
  1344
wenzelm@2554
  1345
* new examples, including two proofs of the Church-Rosser theorem;
wenzelm@2554
  1346
wenzelm@2554
  1347
* non-curried (1994) version of HOL is no longer distributed;
wenzelm@2554
  1348
wenzelm@2553
  1349
paulson@2557
  1350
paulson@2557
  1351
New in Isabelle94-4
paulson@2557
  1352
-------------------
paulson@2557
  1353
paulson@2747
  1354
* greatly reduced space requirements;
paulson@2557
  1355
paulson@2557
  1356
* theory files (.thy) no longer require \...\ escapes at line breaks;
paulson@2557
  1357
wenzelm@5726
  1358
* searchable theorem database (see the section "Retrieving theorems" on
paulson@2557
  1359
page 8 of the Reference Manual);
paulson@2557
  1360
paulson@2557
  1361
* new examples, including Grabczewski's monumental case study of the
paulson@2557
  1362
Axiom of Choice;
paulson@2557
  1363
paulson@2557
  1364
* The previous version of HOL renamed to Old_HOL;
paulson@2557
  1365
wenzelm@5726
  1366
* The new version of HOL (previously called CHOL) uses a curried syntax
paulson@2557
  1367
for functions.  Application looks like f a b instead of f(a,b);
paulson@2557
  1368
paulson@2557
  1369
* Mutually recursive inductive definitions finally work in HOL;
paulson@2557
  1370
paulson@2557
  1371
* In ZF, pattern-matching on tuples is now available in all abstractions and
paulson@2557
  1372
translates to the operator "split";
paulson@2557
  1373
paulson@2557
  1374
paulson@2557
  1375
paulson@2557
  1376
New in Isabelle94-3
paulson@2557
  1377
-------------------
paulson@2557
  1378
wenzelm@5726
  1379
* new infix operator, addss, allowing the classical reasoner to
paulson@2557
  1380
perform simplification at each step of its search.  Example:
wenzelm@5726
  1381
        fast_tac (cs addss ss)
paulson@2557
  1382
wenzelm@5726
  1383
* a new logic, CHOL, the same as HOL, but with a curried syntax
wenzelm@5726
  1384
for functions.  Application looks like f a b instead of f(a,b).  Also pairs
paulson@2557
  1385
look like (a,b) instead of <a,b>;
paulson@2557
  1386
paulson@2557
  1387
* PLEASE NOTE: CHOL will eventually replace HOL!
paulson@2557
  1388
paulson@2557
  1389
* In CHOL, pattern-matching on tuples is now available in all abstractions.
paulson@2557
  1390
It translates to the operator "split".  A new theory of integers is available;
paulson@2557
  1391
paulson@2557
  1392
* In ZF, integer numerals now denote two's-complement binary integers.
paulson@2557
  1393
Arithmetic operations can be performed by rewriting.  See ZF/ex/Bin.ML;
paulson@2557
  1394
wenzelm@5726
  1395
* Many new examples: I/O automata, Church-Rosser theorem, equivalents
paulson@2557
  1396
of the Axiom of Choice;
paulson@2557
  1397
paulson@2557
  1398
paulson@2557
  1399
paulson@2557
  1400
New in Isabelle94-2
paulson@2557
  1401
-------------------
paulson@2557
  1402
wenzelm@5726
  1403
* Significantly faster resolution;
paulson@2557
  1404
paulson@2557
  1405
* the different sections in a .thy file can now be mixed and repeated
paulson@2557
  1406
freely;
paulson@2557
  1407
paulson@2557
  1408
* Database of theorems for FOL, HOL and ZF.  New
paulson@2557
  1409
commands including qed, qed_goal and bind_thm store theorems in the database.
paulson@2557
  1410
paulson@2557
  1411
* Simple database queries: return a named theorem (get_thm) or all theorems of
paulson@2557
  1412
a given theory (thms_of), or find out what theory a theorem was proved in
paulson@2557
  1413
(theory_of_thm);
paulson@2557
  1414
paulson@2557
  1415
* Bugs fixed in the inductive definition and datatype packages;
paulson@2557
  1416
paulson@2557
  1417
* The classical reasoner provides deepen_tac and depth_tac, making FOL_dup_cs
paulson@2557
  1418
and HOL_dup_cs obsolete;
paulson@2557
  1419
paulson@2557
  1420
* Syntactic ambiguities caused by the new treatment of syntax in Isabelle94-1
paulson@2557
  1421
have been removed;
paulson@2557
  1422
paulson@2557
  1423
* Simpler definition of function space in ZF;
paulson@2557
  1424
paulson@2557
  1425
* new results about cardinal and ordinal arithmetic in ZF;
paulson@2557
  1426
paulson@2557
  1427
* 'subtype' facility in HOL for introducing new types as subsets of existing
paulson@2557
  1428
types;
paulson@2557
  1429
paulson@2557
  1430
wenzelm@2553
  1431
$Id$