NEWS
author wenzelm
Wed Jun 07 14:20:16 2000 +0200 (2000-06-07)
changeset 9052 7db48fe85b05
parent 9028 8a1ec8f05f14
child 9057 af1ca1acf292
permissions -rw-r--r--
provide TAGS file for Isabelle sources;
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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* HOL: exhaust_tac on datatypes superceded by new generic case_tac;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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* 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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* 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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*** 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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* 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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* 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: replace 'as' keyword by 'and';
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* theory command 'hide' removes declarations from class/type/const
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name spaces;
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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, e.g.
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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 '$ISABELLE_HOME';
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* in locales, the "assumes" and "defines" parts may be omitted if
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empty;
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* new print_mode "xsymbols" for extended symbol support (e.g. genuine
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long arrows);
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* new print_mode "HTML";
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* new flag show_tags controls display of tags of theorems (which are
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basically just comments that may be attached by some tools);
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* Isamode 2.6 requires patch to accomodate change of Isabelle font
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mode and goal output format:
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diff -r Isamode-2.6/elisp/isa-load.el Isamode/elisp/isa-load.el
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244c244
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<       (list (isa-getenv "ISABELLE") "-msymbols" logic-name)
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---
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>       (list (isa-getenv "ISABELLE") "-misabelle_font" "-msymbols" logic-name)
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diff -r Isabelle-2.6/elisp/isa-proofstate.el Isamode/elisp/isa-proofstate.el
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181c181
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< (defconst proofstate-proofstart-regexp "^Level [0-9]+$"
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---
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> (defconst proofstate-proofstart-regexp "^Level [0-9]+"
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* function bind_thms stores lists of theorems (cf. bind_thm);
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* new shorthand tactics ftac, eatac, datac, fatac;
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* qed (and friends) now accept "" as result name; in that case the
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theorem is not stored, but proper checks and presentation of the
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result still apply;
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* theorem database now also indexes constants "Trueprop", "all",
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"==>", "=="; thus thms_containing, findI etc. may retrieve more rules;
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*** HOL ***
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** HOL arithmetic **
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* There are now decision procedures for linear arithmetic over nat and
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int:
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1. arith_tac copes with arbitrary formulae involving `=', `<', `<=',
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`+', `-', `Suc', `min', `max' and numerical constants; other subterms
wenzelm@6343
   353
are treated as atomic; subformulae not involving type `nat' or `int'
wenzelm@6343
   354
are ignored; quantified subformulae are ignored unless they are
wenzelm@6343
   355
positive universal or negative existential. The tactic has to be
wenzelm@6343
   356
invoked by hand and can be a little bit slow. In particular, the
wenzelm@6343
   357
running time is exponential in the number of occurrences of `min' and
wenzelm@6343
   358
`max', and `-' on `nat'.
nipkow@6131
   359
wenzelm@6343
   360
2. fast_arith_tac is a cut-down version of arith_tac: it only takes
wenzelm@6343
   361
(negated) (in)equalities among the premises and the conclusion into
wenzelm@6343
   362
account (i.e. no compound formulae) and does not know about `min' and
wenzelm@6343
   363
`max', and `-' on `nat'. It is fast and is used automatically by the
wenzelm@6343
   364
simplifier.
nipkow@6131
   365
wenzelm@6343
   366
NB: At the moment, these decision procedures do not cope with mixed
wenzelm@6343
   367
nat/int formulae where the two parts interact, such as `m < n ==>
wenzelm@6343
   368
int(m) < int(n)'.
oheimb@6028
   369
wenzelm@7215
   370
* HOL/Numeral provides a generic theory of numerals (encoded
wenzelm@7313
   371
efficiently as bit strings); setup for types nat/int/real is in place;
wenzelm@7215
   372
INCOMPATIBILITY: since numeral syntax is now polymorphic, rather than
wenzelm@7215
   373
int, existing theories and proof scripts may require a few additional
wenzelm@7215
   374
type constraints;
wenzelm@7215
   375
wenzelm@7215
   376
* integer division and remainder can now be performed on constant
wenzelm@7215
   377
arguments;
paulson@7157
   378
wenzelm@7215
   379
* many properties of integer multiplication, division and remainder
wenzelm@7215
   380
are now available;
paulson@6922
   381
paulson@7287
   382
* An interface to the Stanford Validity Checker (SVC) is available through the
paulson@7287
   383
tactic svc_tac.  Propositional tautologies and theorems of linear arithmetic
paulson@7287
   384
are proved automatically.  SVC must be installed separately, and its results
paulson@7287
   385
must be TAKEN ON TRUST (Isabelle does not check the proofs, but tags any
paulson@7287
   386
invocation of the underlying oracle).  For SVC see
paulson@7444
   387
  http://verify.stanford.edu/SVC
paulson@6922
   388
wenzelm@7125
   389
* IsaMakefile: the HOL-Real target now builds an actual image;
wenzelm@7125
   390
wenzelm@7215
   391
wenzelm@7215
   392
** HOL misc **
wenzelm@7215
   393
wenzelm@7595
   394
* HOL/Real/HahnBanach: the Hahn-Banach theorem for real vector spaces
wenzelm@7595
   395
(in Isabelle/Isar) -- by Gertrud Bauer;
wenzelm@7595
   396
wenzelm@7691
   397
* HOL/BCV: generic model of bytecode verification, i.e. data-flow
wenzelm@7691
   398
analysis for assembly languages with subtypes;
wenzelm@7691
   399
wenzelm@6278
   400
* HOL/TLA (Lamport's Temporal Logic of Actions): major reorganization
wenzelm@6278
   401
-- avoids syntactic ambiguities and treats state, transition, and
wenzelm@6278
   402
temporal levels more uniformly; introduces INCOMPATIBILITIES due to
wenzelm@6278
   403
changed syntax and (many) tactics;
wenzelm@6278
   404
wenzelm@7791
   405
* HOL/inductive: Now also handles more general introduction rules such
wenzelm@7791
   406
  as "ALL y. (y, x) : r --> y : acc r ==> x : acc r"; monotonicity
wenzelm@7791
   407
  theorems are now maintained within the theory (maintained via the
wenzelm@7791
   408
  "mono" attribute);
berghofe@7780
   409
wenzelm@7238
   410
* HOL/datatype: Now also handles arbitrarily branching datatypes
wenzelm@7238
   411
  (using function types) such as
wenzelm@7238
   412
wenzelm@7238
   413
  datatype 'a tree = Atom 'a | Branch "nat => 'a tree"
berghofe@7047
   414
wenzelm@7326
   415
* HOL/record: record_simproc (part of the default simpset) takes care
wenzelm@7326
   416
of selectors applied to updated records; record_split_tac is no longer
wenzelm@7327
   417
part of the default claset; update_defs may now be removed from the
wenzelm@7327
   418
simpset in many cases; COMPATIBILITY: old behavior achieved by
wenzelm@7326
   419
wenzelm@7326
   420
  claset_ref () := claset() addSWrapper record_split_wrapper;
wenzelm@7326
   421
  Delsimprocs [record_simproc]
wenzelm@7326
   422
wenzelm@6386
   423
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
   424
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
   425
paulson@7287
   426
* HOL/recdef (TFL): 'congs' syntax now expects comma separated list of theorem
paulson@7287
   427
names rather than an ML expression;
paulson@7287
   428
paulson@7287
   429
* HOL/defer_recdef (TFL): like recdef but the well-founded relation can be
paulson@7287
   430
supplied later.  Program schemes can be defined, such as
paulson@7287
   431
    "While B C s = (if B s then While B C (C s) else s)"
paulson@7287
   432
where the well-founded relation can be chosen after B and C have been given.
wenzelm@6563
   433
wenzelm@7215
   434
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
   435
INCOMPATIBILITY: while [] and infix # syntax is still there, of
wenzelm@7215
   436
course, ML tools referring to List.list.op # etc. have to be adapted;
wenzelm@7215
   437
wenzelm@7238
   438
* HOL_quantifiers flag superseded by "HOL" print mode, which is
wenzelm@7238
   439
disabled by default; run isabelle with option -m HOL to get back to
wenzelm@7238
   440
the original Gordon/HOL-style output;
wenzelm@7238
   441
wenzelm@7238
   442
* HOL/Ord.thy: new bounded quantifier syntax (input only): ALL x<y. P,
wenzelm@7238
   443
ALL x<=y. P, EX x<y. P, EX x<=y. P;
wenzelm@7238
   444
wenzelm@7238
   445
* HOL basic syntax simplified (more orthogonal): all variants of
wenzelm@7238
   446
All/Ex now support plain / symbolic / HOL notation; plain syntax for
wenzelm@7238
   447
Eps operator is provided as well: "SOME x. P[x]";
wenzelm@7238
   448
berghofe@7320
   449
* HOL/Sum.thy: sum_case has been moved to HOL/Datatype;
wenzelm@7261
   450
wenzelm@7280
   451
* HOL/Univ.thy: infix syntax <*>, <+>, <**>, <+> eliminated and made
wenzelm@7280
   452
thus available for user theories;
wenzelm@7280
   453
wenzelm@7300
   454
* HOLCF/IOA/Sequents: renamed 'Cons' to 'Consq' to avoid clash with
wenzelm@7300
   455
HOL/List; hardly an INCOMPATIBILITY since '>>' syntax is used all the
wenzelm@7300
   456
time;
wenzelm@7300
   457
wenzelm@7986
   458
* HOL: new tactic smp_tac: int -> int -> tactic, which applies spec
wenzelm@7986
   459
several times and then mp;
oheimb@7492
   460
wenzelm@7215
   461
paulson@7113
   462
*** LK ***
paulson@7113
   463
wenzelm@7215
   464
* the notation <<...>> is now available as a notation for sequences of
wenzelm@7215
   465
formulas;
paulson@7113
   466
paulson@7113
   467
* the simplifier is now installed
paulson@7113
   468
wenzelm@8729
   469
* the axiom system has been generalized (thanks to Soren Heilmann)
paulson@7113
   470
paulson@7113
   471
* the classical reasoner now has a default rule database
paulson@7113
   472
paulson@7113
   473
paulson@6064
   474
*** ZF ***
paulson@6064
   475
paulson@6064
   476
* new primrec section allows primitive recursive functions to be given
wenzelm@6269
   477
directly (as in HOL) over datatypes and the natural numbers;
paulson@6064
   478
wenzelm@6269
   479
* new tactics induct_tac and exhaust_tac for induction (or case
wenzelm@6269
   480
analysis) over datatypes and the natural numbers;
paulson@6064
   481
paulson@6064
   482
* the datatype declaration of type T now defines the recursor T_rec;
paulson@6064
   483
paulson@6141
   484
* simplification automatically does freeness reasoning for datatype
wenzelm@6269
   485
constructors;
paulson@6141
   486
wenzelm@6269
   487
* automatic type-inference, with AddTCs command to insert new
wenzelm@6269
   488
type-checking rules;
paulson@6155
   489
wenzelm@6269
   490
* datatype introduction rules are now added as Safe Introduction rules
wenzelm@6269
   491
to the claset;
paulson@6155
   492
wenzelm@6269
   493
* the syntax "if P then x else y" is now available in addition to
wenzelm@6269
   494
if(P,x,y);
wenzelm@6269
   495
paulson@6069
   496
wenzelm@6343
   497
*** Internal programming interfaces ***
wenzelm@6343
   498
wenzelm@7919
   499
* tuned simplifier trace output; new flag debug_simp;
wenzelm@7919
   500
wenzelm@7420
   501
* structures Vartab / Termtab (instances of TableFun) offer efficient
wenzelm@7420
   502
tables indexed by indexname_ord / term_ord (compatible with aconv);
wenzelm@7420
   503
wenzelm@6386
   504
* AxClass.axclass_tac lost the theory argument;
wenzelm@6386
   505
wenzelm@6343
   506
* tuned current_goals_markers semantics: begin / end goal avoids
wenzelm@6343
   507
printing empty lines;
wenzelm@6343
   508
wenzelm@6343
   509
* removed prs and prs_fn hook, which was broken because it did not
wenzelm@6343
   510
include \n in its semantics, forcing writeln to add one
wenzelm@6343
   511
uncoditionally; replaced prs_fn by writeln_fn; consider std_output:
wenzelm@6343
   512
string -> unit if you really want to output text without newline;
wenzelm@6343
   513
wenzelm@6343
   514
* Symbol.output subject to print mode; INCOMPATIBILITY: defaults to
wenzelm@6343
   515
plain output, interface builders may have to enable 'isabelle_font'
wenzelm@6343
   516
mode to get Isabelle font glyphs as before;
wenzelm@6343
   517
wenzelm@6343
   518
* refined token_translation interface; INCOMPATIBILITY: output length
wenzelm@6343
   519
now of type real instead of int;
wenzelm@6343
   520
wenzelm@7196
   521
* theory loader actions may be traced via new ThyInfo.add_hook
wenzelm@7196
   522
interface (see src/Pure/Thy/thy_info.ML); example application: keep
wenzelm@7196
   523
your own database of information attached to *whole* theories -- as
wenzelm@7196
   524
opposed to intra-theory data slots offered via TheoryDataFun;
wenzelm@7196
   525
wenzelm@7647
   526
* proper handling of dangling sort hypotheses (at last!);
wenzelm@7647
   527
Thm.strip_shyps and Drule.strip_shyps_warning take care of removing
wenzelm@7647
   528
extra sort hypotheses that can be witnessed from the type signature;
wenzelm@7986
   529
the force_strip_shyps flag is gone, any remaining shyps are simply
wenzelm@7986
   530
left in the theorem (with a warning issued by strip_shyps_warning);
wenzelm@7647
   531
wenzelm@6343
   532
paulson@6064
   533
wenzelm@5781
   534
New in Isabelle98-1 (October 1998)
wenzelm@5781
   535
----------------------------------
wenzelm@5781
   536
wenzelm@5127
   537
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4842
   538
wenzelm@5726
   539
* several changes of automated proof tools;
wenzelm@5373
   540
wenzelm@5726
   541
* HOL: major changes to the inductive and datatype packages, including
wenzelm@5726
   542
some minor incompatibilities of theory syntax;
berghofe@5214
   543
wenzelm@5726
   544
* HOL: renamed r^-1 to 'converse' from 'inverse'; 'inj_onto' is now
wenzelm@5217
   545
called `inj_on';
paulson@5160
   546
nipkow@5275
   547
* HOL: removed duplicate thms in Arith:
nipkow@5275
   548
  less_imp_add_less  should be replaced by  trans_less_add1
nipkow@5275
   549
  le_imp_add_le      should be replaced by  trans_le_add1
paulson@5160
   550
wenzelm@5726
   551
* HOL: unary minus is now overloaded (new type constraints may be
wenzelm@5726
   552
required);
paulson@5490
   553
wenzelm@5726
   554
* HOL and ZF: unary minus for integers is now #- instead of #~.  In
wenzelm@5726
   555
ZF, expressions such as n#-1 must be changed to n#- 1, since #-1 is
wenzelm@5726
   556
now taken as an integer constant.
paulson@5541
   557
wenzelm@5726
   558
* Pure: ML function 'theory_of' renamed to 'theory';
wenzelm@5397
   559
wenzelm@5363
   560
wenzelm@5127
   561
*** Proof tools ***
nipkow@4880
   562
nipkow@5657
   563
* Simplifier:
nipkow@5657
   564
  1. Asm_full_simp_tac is now more aggressive.
nipkow@5657
   565
     1. It will sometimes reorient premises if that increases their power to
nipkow@5657
   566
        simplify.
nipkow@5657
   567
     2. It does no longer proceed strictly from left to right but may also
nipkow@5657
   568
        rotate premises to achieve further simplification.
nipkow@5657
   569
     For compatibility reasons there is now Asm_lr_simp_tac which is like the
nipkow@5657
   570
     old Asm_full_simp_tac in that it does not rotate premises.
nipkow@5657
   571
  2. The simplifier now knows a little bit about nat-arithmetic.
nipkow@4880
   572
wenzelm@5127
   573
* Classical reasoner: wrapper mechanism for the classical reasoner now
wenzelm@5127
   574
allows for selected deletion of wrappers, by introduction of names for
wenzelm@5127
   575
wrapper functionals.  This implies that addbefore, addSbefore,
wenzelm@5127
   576
addaltern, and addSaltern now take a pair (name, tactic) as argument,
wenzelm@5127
   577
and that adding two tactics with the same name overwrites the first
wenzelm@5127
   578
one (emitting a warning).
oheimb@4824
   579
  type wrapper = (int -> tactic) -> (int -> tactic)
oheimb@4649
   580
  setWrapper, setSWrapper, compWrapper and compSWrapper are replaced by
oheimb@4824
   581
  addWrapper, addSWrapper: claset * (string * wrapper) -> claset
oheimb@4824
   582
  delWrapper, delSWrapper: claset *  string            -> claset
oheimb@4649
   583
  getWrapper is renamed to appWrappers, getSWrapper to appSWrappers;
oheimb@4649
   584
wenzelm@5705
   585
* Classical reasoner: addbefore/addSbefore now have APPEND/ORELSE
wenzelm@5726
   586
semantics; addbefore now affects only the unsafe part of step_tac
wenzelm@5726
   587
etc.; this affects addss/auto_tac/force_tac, so EXISTING PROOFS MAY
wenzelm@5726
   588
FAIL, but proofs should be fixable easily, e.g. by replacing Auto_tac
wenzelm@5726
   589
by Force_tac;
oheimb@5524
   590
wenzelm@5726
   591
* Classical reasoner: setwrapper to setWrapper and compwrapper to
wenzelm@5726
   592
compWrapper; added safe wrapper (and access functions for it);
oheimb@5524
   593
wenzelm@5127
   594
* HOL/split_all_tac is now much faster and fails if there is nothing
wenzelm@5726
   595
to split.  Some EXISTING PROOFS MAY REQUIRE ADAPTION because the order
wenzelm@5726
   596
and the names of the automatically generated variables have changed.
wenzelm@5726
   597
split_all_tac has moved within claset() from unsafe wrappers to safe
wenzelm@5726
   598
wrappers, which means that !!-bound variables are split much more
wenzelm@5726
   599
aggressively, and safe_tac and clarify_tac now split such variables.
wenzelm@5726
   600
If this splitting is not appropriate, use delSWrapper "split_all_tac".
wenzelm@5726
   601
Note: the same holds for record_split_tac, which does the job of
wenzelm@5726
   602
split_all_tac for record fields.
wenzelm@5127
   603
wenzelm@5726
   604
* HOL/Simplifier: Rewrite rules for case distinctions can now be added
wenzelm@5726
   605
permanently to the default simpset using Addsplits just like
wenzelm@5726
   606
Addsimps. They can be removed via Delsplits just like
wenzelm@5726
   607
Delsimps. Lower-case versions are also available.
wenzelm@5127
   608
wenzelm@5726
   609
* HOL/Simplifier: The rule split_if is now part of the default
wenzelm@5726
   610
simpset. This means that the simplifier will eliminate all occurrences
wenzelm@5726
   611
of if-then-else in the conclusion of a goal. To prevent this, you can
wenzelm@5726
   612
either remove split_if completely from the default simpset by
wenzelm@5726
   613
`Delsplits [split_if]' or remove it in a specific call of the
wenzelm@5726
   614
simplifier using `... delsplits [split_if]'.  You can also add/delete
wenzelm@5726
   615
other case splitting rules to/from the default simpset: every datatype
wenzelm@5726
   616
generates suitable rules `split_t_case' and `split_t_case_asm' (where
wenzelm@5726
   617
t is the name of the datatype).
wenzelm@5127
   618
wenzelm@5726
   619
* Classical reasoner / Simplifier combination: new force_tac (and
wenzelm@5127
   620
derivatives Force_tac, force) combines rewriting and classical
wenzelm@5127
   621
reasoning (and whatever other tools) similarly to auto_tac, but is
wenzelm@5726
   622
aimed to solve the given subgoal completely.
wenzelm@5127
   623
wenzelm@5127
   624
wenzelm@5127
   625
*** General ***
wenzelm@5127
   626
wenzelm@5217
   627
* new top-level commands `Goal' and `Goalw' that improve upon `goal'
wenzelm@5127
   628
and `goalw': the theory is no longer needed as an explicit argument -
wenzelm@5127
   629
the current theory context is used; assumptions are no longer returned
wenzelm@5127
   630
at the ML-level unless one of them starts with ==> or !!; it is
wenzelm@5217
   631
recommended to convert to these new commands using isatool fixgoal
wenzelm@5217
   632
(backup your sources first!);
wenzelm@4842
   633
wenzelm@5217
   634
* new top-level commands 'thm' and 'thms' for retrieving theorems from
wenzelm@5207
   635
the current theory context, and 'theory' to lookup stored theories;
paulson@4806
   636
paulson@5722
   637
* new theory section 'locale' for declaring constants, assumptions and
paulson@5722
   638
definitions that have local scope;
paulson@5722
   639
wenzelm@5127
   640
* new theory section 'nonterminals' for purely syntactic types;
wenzelm@4858
   641
wenzelm@5127
   642
* new theory section 'setup' for generic ML setup functions
wenzelm@5127
   643
(e.g. package initialization);
wenzelm@4869
   644
wenzelm@5131
   645
* the distribution now includes Isabelle icons: see
wenzelm@5131
   646
lib/logo/isabelle-{small,tiny}.xpm;
wenzelm@5131
   647
wenzelm@5363
   648
* isatool install - install binaries with absolute references to
wenzelm@5363
   649
ISABELLE_HOME/bin;
wenzelm@5363
   650
wenzelm@5572
   651
* isatool logo -- create instances of the Isabelle logo (as EPS);
wenzelm@5572
   652
wenzelm@5407
   653
* print mode 'emacs' reserved for Isamode;
wenzelm@5407
   654
wenzelm@5726
   655
* support multiple print (ast) translations per constant name;
wenzelm@5726
   656
wenzelm@6925
   657
* theorems involving oracles are now printed with a suffixed [!];
wenzelm@6925
   658
wenzelm@4711
   659
paulson@4661
   660
*** HOL ***
paulson@4661
   661
wenzelm@5710
   662
* there is now a tutorial on Isabelle/HOL (do 'isatool doc tutorial');
nipkow@5709
   663
wenzelm@5217
   664
* HOL/inductive package reorganized and improved: now supports mutual
paulson@5267
   665
definitions such as
wenzelm@5217
   666
wenzelm@5217
   667
  inductive EVEN ODD
wenzelm@5217
   668
    intrs
wenzelm@5217
   669
      null "0 : EVEN"
wenzelm@5217
   670
      oddI "n : EVEN ==> Suc n : ODD"
wenzelm@5217
   671
      evenI "n : ODD ==> Suc n : EVEN"
wenzelm@5217
   672
wenzelm@5217
   673
new theorem list "elims" contains an elimination rule for each of the
wenzelm@5217
   674
recursive sets; inductive definitions now handle disjunctive premises
wenzelm@5217
   675
correctly (also ZF);
berghofe@5214
   676
wenzelm@5217
   677
INCOMPATIBILITIES: requires Inductive as an ancestor; component
wenzelm@5217
   678
"mutual_induct" no longer exists - the induction rule is always
wenzelm@5217
   679
contained in "induct";
wenzelm@5217
   680
wenzelm@5217
   681
wenzelm@5217
   682
* HOL/datatype package re-implemented and greatly improved: now
paulson@5267
   683
supports mutually recursive datatypes such as
wenzelm@5217
   684
wenzelm@5217
   685
  datatype
wenzelm@5217
   686
    'a aexp = IF_THEN_ELSE ('a bexp) ('a aexp) ('a aexp)
wenzelm@5217
   687
            | SUM ('a aexp) ('a aexp)
wenzelm@5217
   688
            | DIFF ('a aexp) ('a aexp)
wenzelm@5217
   689
            | NUM 'a
wenzelm@5217
   690
  and
wenzelm@5217
   691
    'a bexp = LESS ('a aexp) ('a aexp)
wenzelm@5217
   692
            | AND ('a bexp) ('a bexp)
wenzelm@5217
   693
            | OR ('a bexp) ('a bexp)
wenzelm@5217
   694
paulson@5267
   695
as well as indirectly recursive datatypes such as
berghofe@5214
   696
wenzelm@5217
   697
  datatype
wenzelm@5217
   698
    ('a, 'b) term = Var 'a
wenzelm@5217
   699
                  | App 'b ((('a, 'b) term) list)
berghofe@5214
   700
wenzelm@5217
   701
The new tactic  mutual_induct_tac [<var_1>, ..., <var_n>] i  performs
wenzelm@5217
   702
induction on mutually / indirectly recursive datatypes.
wenzelm@5217
   703
wenzelm@5217
   704
Primrec equations are now stored in theory and can be accessed via
wenzelm@5217
   705
<function_name>.simps.
wenzelm@5217
   706
wenzelm@5217
   707
INCOMPATIBILITIES:
berghofe@5214
   708
wenzelm@5217
   709
  - Theories using datatypes must now have theory Datatype as an
wenzelm@5217
   710
    ancestor.
wenzelm@5217
   711
  - The specific <typename>.induct_tac no longer exists - use the
wenzelm@5217
   712
    generic induct_tac instead.
berghofe@5226
   713
  - natE has been renamed to nat.exhaust - use exhaust_tac
wenzelm@5217
   714
    instead of res_inst_tac ... natE. Note that the variable
berghofe@5226
   715
    names in nat.exhaust differ from the names in natE, this
wenzelm@5217
   716
    may cause some "fragile" proofs to fail.
wenzelm@5217
   717
  - The theorems split_<typename>_case and split_<typename>_case_asm
wenzelm@5217
   718
    have been renamed to <typename>.split and <typename>.split_asm.
wenzelm@5217
   719
  - Since default sorts of type variables are now handled correctly,
wenzelm@5217
   720
    some datatype definitions may have to be annotated with explicit
wenzelm@5217
   721
    sort constraints.
wenzelm@5217
   722
  - Primrec definitions no longer require function name and type
wenzelm@5217
   723
    of recursive argument.
berghofe@5214
   724
wenzelm@5217
   725
Consider using isatool fixdatatype to adapt your theories and proof
wenzelm@5217
   726
scripts to the new package (backup your sources first!).
wenzelm@5217
   727
wenzelm@5217
   728
wenzelm@5726
   729
* HOL/record package: considerably improved implementation; now
wenzelm@5726
   730
includes concrete syntax for record types, terms, updates; theorems
wenzelm@5726
   731
for surjective pairing and splitting !!-bound record variables; proof
wenzelm@5726
   732
support is as follows:
wenzelm@5726
   733
wenzelm@5726
   734
  1) standard conversions (selectors or updates applied to record
wenzelm@5726
   735
constructor terms) are part of the standard simpset;
wenzelm@5726
   736
wenzelm@5726
   737
  2) inject equations of the form ((x, y) = (x', y')) == x=x' & y=y' are
wenzelm@5726
   738
made part of standard simpset and claset via addIffs;
wenzelm@5726
   739
wenzelm@5726
   740
  3) a tactic for record field splitting (record_split_tac) is part of
wenzelm@5726
   741
the standard claset (addSWrapper);
wenzelm@5726
   742
wenzelm@5726
   743
To get a better idea about these rules you may retrieve them via
wenzelm@5726
   744
something like 'thms "foo.simps"' or 'thms "foo.iffs"', where "foo" is
wenzelm@5726
   745
the name of your record type.
wenzelm@5726
   746
wenzelm@5726
   747
The split tactic 3) conceptually simplifies by the following rule:
wenzelm@5726
   748
wenzelm@5726
   749
  "(!!x. PROP ?P x) == (!!a b. PROP ?P (a, b))"
wenzelm@5726
   750
wenzelm@5726
   751
Thus any record variable that is bound by meta-all will automatically
wenzelm@5726
   752
blow up into some record constructor term, consequently the
wenzelm@5726
   753
simplifications of 1), 2) apply.  Thus force_tac, auto_tac etc. shall
wenzelm@5726
   754
solve record problems automatically.
wenzelm@5726
   755
berghofe@5214
   756
wenzelm@5125
   757
* reorganized the main HOL image: HOL/Integ and String loaded by
wenzelm@5125
   758
default; theory Main includes everything;
wenzelm@5125
   759
paulson@5650
   760
* automatic simplification of integer sums and comparisons, using cancellation;
paulson@5650
   761
oheimb@5526
   762
* added option_map_eq_Some and not_Some_eq to the default simpset and claset;
wenzelm@5127
   763
wenzelm@5127
   764
* added disj_not1 = "(~P | Q) = (P --> Q)" to the default simpset;
wenzelm@5127
   765
wenzelm@5127
   766
* many new identities for unions, intersections, set difference, etc.;
wenzelm@5127
   767
wenzelm@5127
   768
* expand_if, expand_split, expand_sum_case and expand_nat_case are now
wenzelm@5127
   769
called split_if, split_split, split_sum_case and split_nat_case (to go
wenzelm@5127
   770
with add/delsplits);
wenzelm@5125
   771
wenzelm@5127
   772
* HOL/Prod introduces simplification procedure unit_eq_proc rewriting
wenzelm@5127
   773
(?x::unit) = (); this is made part of the default simpset, which COULD
wenzelm@5127
   774
MAKE EXISTING PROOFS FAIL under rare circumstances (consider
wenzelm@5207
   775
'Delsimprocs [unit_eq_proc];' as last resort); also note that
wenzelm@5207
   776
unit_abs_eta_conv is added in order to counter the effect of
wenzelm@5207
   777
unit_eq_proc on (%u::unit. f u), replacing it by f rather than by
wenzelm@5207
   778
%u.f();
wenzelm@5125
   779
wenzelm@5217
   780
* HOL/Fun INCOMPATIBILITY: `inj_onto' is now called `inj_on' (which
wenzelm@5217
   781
makes more sense);
berghofe@5109
   782
paulson@5475
   783
* HOL/Set INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
   784
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
   785
  disjointness reasoning but breaking a few old proofs.
paulson@5267
   786
wenzelm@5217
   787
* HOL/Relation INCOMPATIBILITY: renamed the relational operator r^-1
wenzelm@5217
   788
to 'converse' from 'inverse' (for compatibility with ZF and some
wenzelm@5217
   789
literature);
wenzelm@5085
   790
wenzelm@5127
   791
* HOL/recdef can now declare non-recursive functions, with {} supplied as
wenzelm@5127
   792
the well-founded relation;
oheimb@4838
   793
paulson@5490
   794
* HOL/Set INCOMPATIBILITY: the complement of set A is now written -A instead of
paulson@5490
   795
    Compl A.  The "Compl" syntax remains available as input syntax for this
paulson@5490
   796
    release ONLY.
paulson@5490
   797
wenzelm@5127
   798
* HOL/Update: new theory of function updates:
wenzelm@5127
   799
    f(a:=b) == %x. if x=a then b else f x
wenzelm@5127
   800
may also be iterated as in f(a:=b,c:=d,...);
nipkow@5077
   801
wenzelm@5127
   802
* HOL/Vimage: new theory for inverse image of a function, syntax f-``B;
paulson@4899
   803
nipkow@5282
   804
* HOL/List:
nipkow@5282
   805
  - new function list_update written xs[i:=v] that updates the i-th
nipkow@5282
   806
    list position. May also be iterated as in xs[i:=a,j:=b,...].
nipkow@5428
   807
  - new function `upt' written [i..j(] which generates the list
nipkow@5428
   808
    [i,i+1,...,j-1], i.e. the upper bound is excluded. To include the upper
nipkow@5428
   809
    bound write [i..j], which is a shorthand for [i..j+1(].
nipkow@5282
   810
  - new lexicographic orderings and corresponding wellfoundedness theorems.
paulson@4779
   811
wenzelm@5127
   812
* HOL/Arith:
wenzelm@5127
   813
  - removed 'pred' (predecessor) function;
wenzelm@5127
   814
  - generalized some theorems about n-1;
wenzelm@5127
   815
  - many new laws about "div" and "mod";
wenzelm@5127
   816
  - new laws about greatest common divisors (see theory ex/Primes);
oheimb@4766
   817
wenzelm@5127
   818
* HOL/Relation: renamed the relational operator r^-1 "converse"
wenzelm@4842
   819
instead of "inverse";
wenzelm@4711
   820
nipkow@5651
   821
* HOL/Induct/Multiset: a theory of multisets, including the wellfoundedness
nipkow@5651
   822
  of the multiset ordering;
nipkow@5651
   823
wenzelm@5127
   824
* directory HOL/Real: a construction of the reals using Dedekind cuts
nipkow@5651
   825
  (not included by default);
nipkow@4835
   826
wenzelm@5127
   827
* directory HOL/UNITY: Chandy and Misra's UNITY formalism;
wenzelm@4711
   828
nipkow@5651
   829
* directory HOL/Hoare: a new version of Hoare logic which permits many-sorted
nipkow@5651
   830
  programs, i.e. different program variables may have different types.
nipkow@5651
   831
paulson@5142
   832
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
   833
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
   834
  Now rew can involve either definitions or equalities (either == or =).
wenzelm@5002
   835
wenzelm@5363
   836
paulson@4879
   837
*** ZF ***
paulson@4879
   838
paulson@5332
   839
* theory Main includes everything; INCOMPATIBILITY: theory ZF.thy contains
paulson@5332
   840
  only the theorems proved on ZF.ML;
paulson@5160
   841
paulson@5475
   842
* ZF INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
   843
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
   844
  disjointness reasoning but breaking a few old proofs.
paulson@5267
   845
paulson@5160
   846
* ZF/Update: new theory of function updates
paulson@5160
   847
    with default rewrite rule  f(x:=y) ` z = if(z=x, y, f`z)
paulson@5160
   848
  may also be iterated as in f(a:=b,c:=d,...);
paulson@5160
   849
paulson@4879
   850
* in  let x=t in u(x), neither t nor u(x) has to be an FOL term.
oheimb@4649
   851
paulson@5142
   852
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
   853
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
   854
  Now rew can involve either definitions or equalities (either == or =).
paulson@5142
   855
paulson@5160
   856
* case_tac provided for compatibility with HOL
paulson@5160
   857
    (like the old excluded_middle_tac, but with subgoals swapped)
paulson@5160
   858
wenzelm@4842
   859
wenzelm@5127
   860
*** Internal programming interfaces ***
wenzelm@5002
   861
wenzelm@5251
   862
* Pure: several new basic modules made available for general use, see
wenzelm@5251
   863
also src/Pure/README;
wenzelm@5207
   864
wenzelm@5008
   865
* improved the theory data mechanism to support encapsulation (data
wenzelm@5008
   866
kind name replaced by private Object.kind, acting as authorization
wenzelm@5373
   867
key); new type-safe user interface via functor TheoryDataFun; generic
wenzelm@5373
   868
print_data function becomes basically useless;
wenzelm@5002
   869
wenzelm@5251
   870
* removed global_names compatibility flag -- all theory declarations
wenzelm@5251
   871
are qualified by default;
wenzelm@5251
   872
wenzelm@5085
   873
* module Pure/Syntax now offers quote / antiquote translation
wenzelm@5085
   874
functions (useful for Hoare logic etc. with implicit dependencies);
wenzelm@5373
   875
see HOL/ex/Antiquote for an example use;
wenzelm@5085
   876
wenzelm@5127
   877
* Simplifier now offers conversions (asm_)(full_)rewrite: simpset ->
wenzelm@5127
   878
cterm -> thm;
wenzelm@5127
   879
wenzelm@5207
   880
* new tactical CHANGED_GOAL for checking that a tactic modifies a
wenzelm@5207
   881
subgoal;
paulson@5142
   882
wenzelm@5251
   883
* Display.print_goals function moved to Locale.print_goals;
wenzelm@5251
   884
wenzelm@5731
   885
* standard print function for goals supports current_goals_markers
wenzelm@5731
   886
variable for marking begin of proof, end of proof, start of goal; the
wenzelm@5731
   887
default is ("", "", ""); setting current_goals_markers := ("<proof>",
wenzelm@5731
   888
"</proof>", "<goal>") causes SGML like tagged proof state printing,
wenzelm@5731
   889
for example;
wenzelm@5731
   890
wenzelm@5002
   891
wenzelm@5002
   892
wenzelm@4410
   893
New in Isabelle98 (January 1998)
wenzelm@4410
   894
--------------------------------
wenzelm@4410
   895
wenzelm@4410
   896
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4410
   897
wenzelm@4410
   898
* changed lexical syntax of terms / types: dots made part of long
wenzelm@4410
   899
identifiers, e.g. "%x.x" no longer possible, should be "%x. x";
wenzelm@4410
   900
wenzelm@4410
   901
* simpset (and claset) reference variable replaced by functions
wenzelm@4410
   902
simpset / simpset_ref;
wenzelm@4410
   903
wenzelm@4410
   904
* no longer supports theory aliases (via merge) and non-trivial
wenzelm@4410
   905
implicit merge of thms' signatures;
wenzelm@4410
   906
wenzelm@4410
   907
* most internal names of constants changed due to qualified names;
wenzelm@4410
   908
wenzelm@4410
   909
* changed Pure/Sequence interface (see Pure/seq.ML);
wenzelm@4410
   910
wenzelm@3454
   911
paulson@3715
   912
*** General Changes ***
paulson@3715
   913
wenzelm@4174
   914
* hierachically structured name spaces (for consts, types, axms, thms
wenzelm@3943
   915
etc.); new lexical class 'longid' (e.g. Foo.bar.x) may render much of
wenzelm@4108
   916
old input syntactically incorrect (e.g. "%x.x"); COMPATIBILITY:
wenzelm@4108
   917
isatool fixdots ensures space after dots (e.g. "%x. x"); set
wenzelm@4174
   918
long_names for fully qualified output names; NOTE: ML programs
wenzelm@4174
   919
(special tactics, packages etc.) referring to internal names may have
wenzelm@4174
   920
to be adapted to cope with fully qualified names; in case of severe
wenzelm@4174
   921
backward campatibility problems try setting 'global_names' at compile
wenzelm@4174
   922
time to have enrything declared within a flat name space; one may also
wenzelm@4174
   923
fine tune name declarations in theories via the 'global' and 'local'
wenzelm@4174
   924
section;
wenzelm@4108
   925
wenzelm@4108
   926
* reimplemented the implicit simpset and claset using the new anytype
wenzelm@4108
   927
data filed in signatures; references simpset:simpset ref etc. are
wenzelm@4108
   928
replaced by functions simpset:unit->simpset and
wenzelm@4108
   929
simpset_ref:unit->simpset ref; COMPATIBILITY: use isatool fixclasimp
wenzelm@4108
   930
to patch your ML files accordingly;
paulson@3856
   931
wenzelm@3857
   932
* HTML output now includes theory graph data for display with Java
wenzelm@3857
   933
applet or isatool browser; data generated automatically via isatool
wenzelm@3901
   934
usedir (see -i option, ISABELLE_USEDIR_OPTIONS);
wenzelm@3857
   935
paulson@3856
   936
* defs may now be conditional; improved rewrite_goals_tac to handle
paulson@3856
   937
conditional equations;
paulson@3856
   938
wenzelm@4174
   939
* defs now admits additional type arguments, using TYPE('a) syntax;
wenzelm@4174
   940
wenzelm@3901
   941
* theory aliases via merge (e.g. M=A+B+C) no longer supported, always
wenzelm@3901
   942
creates a new theory node; implicit merge of thms' signatures is
wenzelm@4112
   943
restricted to 'trivial' ones; COMPATIBILITY: one may have to use
wenzelm@3901
   944
transfer:theory->thm->thm in (rare) cases;
wenzelm@3901
   945
wenzelm@3968
   946
* improved handling of draft signatures / theories; draft thms (and
wenzelm@3968
   947
ctyps, cterms) are automatically promoted to real ones;
wenzelm@3968
   948
wenzelm@3901
   949
* slightly changed interfaces for oracles: admit many per theory, named
wenzelm@3901
   950
(e.g. oracle foo = mlfun), additional name argument for invoke_oracle;
wenzelm@3901
   951
wenzelm@3901
   952
* print_goals: optional output of const types (set show_consts and
wenzelm@3901
   953
show_types);
wenzelm@3851
   954
wenzelm@4388
   955
* improved output of warnings (###) and errors (***);
wenzelm@3697
   956
paulson@4178
   957
* subgoal_tac displays a warning if the new subgoal has type variables;
paulson@4178
   958
paulson@3715
   959
* removed old README and Makefiles;
wenzelm@3697
   960
paulson@3856
   961
* replaced print_goals_ref hook by print_current_goals_fn and result_error_fn;
wenzelm@3670
   962
paulson@3715
   963
* removed obsolete init_pps and init_database;
paulson@3715
   964
paulson@3715
   965
* deleted the obsolete tactical STATE, which was declared by
paulson@3715
   966
    fun STATE tacfun st = tacfun st st;
paulson@3715
   967
wenzelm@4388
   968
* cd and use now support path variables, e.g. $ISABELLE_HOME, or ~
wenzelm@4388
   969
(which abbreviates $HOME);
wenzelm@4269
   970
wenzelm@4269
   971
* changed Pure/Sequence interface (see Pure/seq.ML); COMPATIBILITY:
wenzelm@4269
   972
use isatool fixseq to adapt your ML programs (this works for fully
wenzelm@4269
   973
qualified references to the Sequence structure only!);
wenzelm@4269
   974
wenzelm@4381
   975
* use_thy no longer requires writable current directory; it always
wenzelm@4381
   976
reloads .ML *and* .thy file, if either one is out of date;
wenzelm@4269
   977
paulson@3715
   978
paulson@3715
   979
*** Classical Reasoner ***
paulson@3715
   980
wenzelm@3744
   981
* Clarify_tac, clarify_tac, clarify_step_tac, Clarify_step_tac: new
wenzelm@3744
   982
tactics that use classical reasoning to simplify a subgoal without
wenzelm@3744
   983
splitting it into several subgoals;
paulson@3715
   984
paulson@3719
   985
* Safe_tac: like safe_tac but uses the default claset;
paulson@3719
   986
paulson@3715
   987
paulson@3715
   988
*** Simplifier ***
paulson@3715
   989
paulson@3715
   990
* added simplification meta rules:
paulson@3715
   991
    (asm_)(full_)simplify: simpset -> thm -> thm;
paulson@3715
   992
paulson@3715
   993
* simplifier.ML no longer part of Pure -- has to be loaded by object
paulson@3715
   994
logics (again);
paulson@3715
   995
paulson@3715
   996
* added prems argument to simplification procedures;
paulson@3715
   997
paulson@4325
   998
* HOL, FOL, ZF: added infix function `addsplits':
paulson@4325
   999
  instead of `<simpset> setloop (split_tac <thms>)'
paulson@4325
  1000
  you can simply write `<simpset> addsplits <thms>'
paulson@4325
  1001
paulson@3715
  1002
paulson@3715
  1003
*** Syntax ***
paulson@3715
  1004
wenzelm@4174
  1005
* TYPE('a) syntax for type reflection terms;
wenzelm@4174
  1006
wenzelm@3985
  1007
* no longer handles consts with name "" -- declare as 'syntax' instead;
paulson@3856
  1008
paulson@3856
  1009
* pretty printer: changed order of mixfix annotation preference (again!);
wenzelm@3846
  1010
paulson@3715
  1011
* Pure: fixed idt/idts vs. pttrn/pttrns syntactic categories;
paulson@3715
  1012
paulson@3715
  1013
paulson@3715
  1014
*** HOL ***
paulson@3715
  1015
wenzelm@5726
  1016
* HOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  1017
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
  1018
nipkow@4035
  1019
* HOL/TLA: Stephan Merz's formalization of Lamport's Temporal Logic of Actions;
wenzelm@3985
  1020
wenzelm@3985
  1021
* HOL/Auth: new protocol proofs including some for the Internet
nipkow@4035
  1022
  protocol TLS;
wenzelm@3985
  1023
wenzelm@4125
  1024
* HOL/Map: new theory of `maps' a la VDM;
nipkow@3982
  1025
wenzelm@4335
  1026
* HOL/simplifier: simplification procedures nat_cancel_sums for
wenzelm@4335
  1027
cancelling out common nat summands from =, <, <= (in)equalities, or
wenzelm@4335
  1028
differences; simplification procedures nat_cancel_factor for
wenzelm@4335
  1029
cancelling common factor from =, <, <= (in)equalities over natural
wenzelm@4373
  1030
sums; nat_cancel contains both kinds of procedures, it is installed by
wenzelm@4373
  1031
default in Arith.thy -- this COULD MAKE EXISTING PROOFS FAIL;
wenzelm@4335
  1032
nipkow@3580
  1033
* HOL/simplifier: terms of the form
paulson@4325
  1034
  `? x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x)'  (or t=x)
nipkow@3580
  1035
  are rewritten to
nipkow@4035
  1036
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t)',
nipkow@4035
  1037
  and those of the form
paulson@4325
  1038
  `! x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x) --> R(x)'  (or t=x)
nipkow@4035
  1039
  are rewritten to
nipkow@4035
  1040
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t) --> R(t)',
nipkow@4035
  1041
nipkow@4035
  1042
* HOL/datatype
nipkow@4035
  1043
  Each datatype `t' now comes with a theorem `split_t_case' of the form
nipkow@3580
  1044
nipkow@4035
  1045
  P(t_case f1 ... fn x) =
nipkow@4035
  1046
     ( (!y1 ... ym1. x = C1 y1 ... ym1 --> P(f1 y1 ... ym1)) &
nipkow@4035
  1047
        ...
oheimb@4189
  1048
       (!y1 ... ymn. x = Cn y1 ... ymn --> P(f1 y1 ... ymn))
nipkow@4035
  1049
     )
nipkow@4035
  1050
oheimb@4930
  1051
  and a theorem `split_t_case_asm' of the form
oheimb@4189
  1052
oheimb@4189
  1053
  P(t_case f1 ... fn x) =
oheimb@4189
  1054
    ~( (? y1 ... ym1. x = C1 y1 ... ym1 & ~P(f1 y1 ... ym1)) |
oheimb@4189
  1055
        ...
oheimb@4189
  1056
       (? y1 ... ymn. x = Cn y1 ... ymn & ~P(f1 y1 ... ymn))
oheimb@4189
  1057
     )
oheimb@4930
  1058
  which can be added to a simpset via `addsplits'. The existing theorems
oheimb@4930
  1059
  expand_list_case and expand_option_case have been renamed to
oheimb@4930
  1060
  split_list_case and split_option_case.
oheimb@4189
  1061
nipkow@4361
  1062
* HOL/Arithmetic:
nipkow@4361
  1063
  - `pred n' is automatically converted to `n-1'.
nipkow@4361
  1064
    Users are strongly encouraged not to use `pred' any longer,
nipkow@4361
  1065
    because it will disappear altogether at some point.
nipkow@4361
  1066
  - Users are strongly encouraged to write "0 < n" rather than
nipkow@4361
  1067
    "n ~= 0". Theorems and proof tools have been modified towards this
nipkow@4361
  1068
    `standard'.
nipkow@4357
  1069
nipkow@4502
  1070
* HOL/Lists:
nipkow@4502
  1071
  the function "set_of_list" has been renamed "set" (and its theorems too);
nipkow@4502
  1072
  the function "nth" now takes its arguments in the reverse order and
nipkow@4502
  1073
  has acquired the infix notation "!" as in "xs!n".
paulson@3570
  1074
paulson@4154
  1075
* HOL/Set: UNIV is now a constant and is no longer translated to Compl{};
paulson@4154
  1076
paulson@4154
  1077
* HOL/Set: The operator (UN x.B x) now abbreviates (UN x:UNIV. B x) and its
paulson@4154
  1078
  specialist theorems (like UN1_I) are gone.  Similarly for (INT x.B x);
paulson@4154
  1079
wenzelm@4575
  1080
* HOL/record: extensible records with schematic structural subtyping
wenzelm@4575
  1081
(single inheritance); EXPERIMENTAL version demonstrating the encoding,
wenzelm@4575
  1082
still lacks various theorems and concrete record syntax;
wenzelm@4575
  1083
wenzelm@4125
  1084
paulson@3715
  1085
*** HOLCF ***
wenzelm@3535
  1086
wenzelm@4125
  1087
* removed "axioms" and "generated by" sections;
wenzelm@4125
  1088
oheimb@4123
  1089
* replaced "ops" section by extended "consts" section, which is capable of
wenzelm@4125
  1090
  handling the continuous function space "->" directly;
wenzelm@4125
  1091
wenzelm@4125
  1092
* domain package:
wenzelm@4125
  1093
  . proves theorems immediately and stores them in the theory,
wenzelm@4125
  1094
  . creates hierachical name space,
wenzelm@4125
  1095
  . now uses normal mixfix annotations (instead of cinfix...),
wenzelm@4125
  1096
  . minor changes to some names and values (for consistency),
wenzelm@4125
  1097
  . e.g. cases -> casedist, dists_eq -> dist_eqs, [take_lemma] -> take_lemmas,
wenzelm@4125
  1098
  . separator between mutual domain defs: changed "," to "and",
wenzelm@4125
  1099
  . improved handling of sort constraints;  now they have to
wenzelm@4125
  1100
    appear on the left-hand side of the equations only;
oheimb@4123
  1101
oheimb@4123
  1102
* fixed LAM <x,y,zs>.b syntax;
wenzelm@3567
  1103
wenzelm@3744
  1104
* added extended adm_tac to simplifier in HOLCF -- can now discharge
wenzelm@3744
  1105
adm (%x. P (t x)), where P is chainfinite and t continuous;
wenzelm@3579
  1106
wenzelm@3579
  1107
paulson@3719
  1108
*** FOL and ZF ***
paulson@3719
  1109
wenzelm@5726
  1110
* FOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  1111
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
  1112
wenzelm@3744
  1113
* qed_spec_mp, qed_goal_spec_mp, qed_goalw_spec_mp are available, as
wenzelm@3744
  1114
in HOL, they strip ALL and --> from proved theorems;
wenzelm@3744
  1115
paulson@3719
  1116
wenzelm@3579
  1117
wenzelm@3006
  1118
New in Isabelle94-8 (May 1997)
wenzelm@3006
  1119
------------------------------
wenzelm@2654
  1120
paulson@3002
  1121
*** General Changes ***
paulson@3002
  1122
paulson@3002
  1123
* new utilities to build / run / maintain Isabelle etc. (in parts
paulson@3002
  1124
still somewhat experimental); old Makefiles etc. still functional;
wenzelm@2971
  1125
wenzelm@3205
  1126
* new 'Isabelle System Manual';
wenzelm@3205
  1127
wenzelm@2825
  1128
* INSTALL text, together with ./configure and ./build scripts;
wenzelm@2773
  1129
wenzelm@3006
  1130
* reimplemented type inference for greater efficiency, better error
wenzelm@3006
  1131
messages and clean internal interface;
paulson@3002
  1132
paulson@3002
  1133
* prlim command for dealing with lots of subgoals (an easier way of
paulson@3002
  1134
setting goals_limit);
paulson@3002
  1135
wenzelm@3006
  1136
wenzelm@3006
  1137
*** Syntax ***
paulson@3002
  1138
wenzelm@3116
  1139
* supports alternative (named) syntax tables (parser and pretty
wenzelm@3116
  1140
printer); internal interface is provided by add_modesyntax(_i);
wenzelm@3116
  1141
paulson@3002
  1142
* Pure, FOL, ZF, HOL, HOLCF now support symbolic input and output; to
paulson@3002
  1143
be used in conjunction with the Isabelle symbol font; uses the
paulson@3002
  1144
"symbols" syntax table;
paulson@3002
  1145
wenzelm@2705
  1146
* added token_translation interface (may translate name tokens in
wenzelm@2756
  1147
arbitrary ways, dependent on their type (free, bound, tfree, ...) and
wenzelm@3116
  1148
the current print_mode); IMPORTANT: user print translation functions
wenzelm@3116
  1149
are responsible for marking newly introduced bounds
wenzelm@3116
  1150
(Syntax.mark_boundT);
wenzelm@2705
  1151
wenzelm@2730
  1152
* token translations for modes "xterm" and "xterm_color" that display
wenzelm@3006
  1153
names in bold, underline etc. or colors (which requires a color
wenzelm@3006
  1154
version of xterm);
wenzelm@2730
  1155
paulson@3002
  1156
* infixes may now be declared with names independent of their syntax;
paulson@3002
  1157
paulson@3002
  1158
* added typed_print_translation (like print_translation, but may
paulson@3002
  1159
access type of constant);
paulson@3002
  1160
wenzelm@3006
  1161
paulson@3002
  1162
*** Classical Reasoner ***
paulson@3002
  1163
paulson@3002
  1164
Blast_tac: a new tactic!  It is often more powerful than fast_tac, but has
paulson@3002
  1165
some limitations.  Blast_tac...
paulson@3002
  1166
  + ignores addss, addbefore, addafter; this restriction is intrinsic
paulson@3002
  1167
  + ignores elimination rules that don't have the correct format
wenzelm@5726
  1168
        (the conclusion MUST be a formula variable)
paulson@3002
  1169
  + ignores types, which can make HOL proofs fail
paulson@3002
  1170
  + rules must not require higher-order unification, e.g. apply_type in ZF
paulson@3002
  1171
    [message "Function Var's argument not a bound variable" relates to this]
paulson@3002
  1172
  + its proof strategy is more general but can actually be slower
paulson@3002
  1173
wenzelm@3107
  1174
* substitution with equality assumptions no longer permutes other
wenzelm@3107
  1175
assumptions;
paulson@3002
  1176
paulson@3002
  1177
* minor changes in semantics of addafter (now called addaltern); renamed
paulson@3002
  1178
setwrapper to setWrapper and compwrapper to compWrapper; added safe wrapper
wenzelm@3107
  1179
(and access functions for it);
paulson@3002
  1180
wenzelm@5726
  1181
* improved combination of classical reasoner and simplifier:
oheimb@3317
  1182
  + functions for handling clasimpsets
oheimb@3317
  1183
  + improvement of addss: now the simplifier is called _after_ the
oheimb@3317
  1184
    safe steps.
oheimb@3317
  1185
  + safe variant of addss called addSss: uses safe simplifications
wenzelm@5726
  1186
    _during_ the safe steps. It is more complete as it allows multiple
oheimb@3317
  1187
    instantiations of unknowns (e.g. with slow_tac).
wenzelm@3006
  1188
paulson@3002
  1189
*** Simplifier ***
paulson@3002
  1190
wenzelm@3006
  1191
* added interface for simplification procedures (functions that
wenzelm@3006
  1192
produce *proven* rewrite rules on the fly, depending on current
wenzelm@3006
  1193
redex);
wenzelm@3006
  1194
wenzelm@3006
  1195
* ordering on terms as parameter (used for ordered rewriting);
wenzelm@3006
  1196
wenzelm@3107
  1197
* new functions delcongs, deleqcongs, and Delcongs. richer rep_ss;
paulson@3002
  1198
paulson@3002
  1199
* the solver is now split into a safe and an unsafe part.
paulson@3002
  1200
This should be invisible for the normal user, except that the
paulson@3002
  1201
functions setsolver and addsolver have been renamed to setSolver and
wenzelm@3107
  1202
addSolver; added safe_asm_full_simp_tac;
paulson@3002
  1203
paulson@3002
  1204
paulson@3002
  1205
*** HOL ***
paulson@3002
  1206
nipkow@3042
  1207
* a generic induction tactic `induct_tac' which works for all datatypes and
wenzelm@3107
  1208
also for type `nat';
nipkow@3042
  1209
nipkow@3316
  1210
* a generic case distinction tactic `exhaust_tac' which works for all
nipkow@3316
  1211
datatypes and also for type `nat';
nipkow@3316
  1212
nipkow@3316
  1213
* each datatype comes with a function `size';
nipkow@3316
  1214
paulson@3002
  1215
* patterns in case expressions allow tuple patterns as arguments to
wenzelm@3107
  1216
constructors, for example `case x of [] => ... | (x,y,z)#ps => ...';
paulson@3002
  1217
paulson@3002
  1218
* primrec now also works with type nat;
paulson@3002
  1219
paulson@3338
  1220
* recdef: a new declaration form, allows general recursive functions to be
paulson@3338
  1221
defined in theory files.  See HOL/ex/Fib, HOL/ex/Primes, HOL/Subst/Unify.
paulson@3338
  1222
paulson@3002
  1223
* the constant for negation has been renamed from "not" to "Not" to
wenzelm@3107
  1224
harmonize with FOL, ZF, LK, etc.;
paulson@3002
  1225
wenzelm@3107
  1226
* HOL/ex/LFilter theory of a corecursive "filter" functional for
wenzelm@3107
  1227
infinite lists;
paulson@3002
  1228
wenzelm@3227
  1229
* HOL/Modelcheck demonstrates invocation of model checker oracle;
wenzelm@3227
  1230
paulson@3002
  1231
* HOL/ex/Ring.thy declares cring_simp, which solves equational
paulson@3002
  1232
problems in commutative rings, using axiomatic type classes for + and *;
paulson@3002
  1233
paulson@3002
  1234
* more examples in HOL/MiniML and HOL/Auth;
paulson@3002
  1235
paulson@3002
  1236
* more default rewrite rules for quantifiers, union/intersection;
paulson@3002
  1237
nipkow@3321
  1238
* a new constant `arbitrary == @x.False';
nipkow@3321
  1239
wenzelm@3107
  1240
* HOLCF/IOA replaces old HOL/IOA;
wenzelm@3107
  1241
wenzelm@5726
  1242
* HOLCF changes: derived all rules and arities
wenzelm@5726
  1243
  + axiomatic type classes instead of classes
slotosch@2653
  1244
  + typedef instead of faking type definitions
paulson@2747
  1245
  + eliminated the internal constants less_fun, less_cfun, UU_fun, UU_cfun etc.
wenzelm@2730
  1246
  + new axclasses cpo, chfin, flat with flat < chfin < pcpo < cpo < po
slotosch@2653
  1247
  + eliminated the types void, one, tr
slotosch@2653
  1248
  + use unit lift and bool lift (with translations) instead of one and tr
slotosch@2653
  1249
  + eliminated blift from Lift3.thy (use Def instead of blift)
wenzelm@3107
  1250
  all eliminated rules are derived as theorems --> no visible changes ;
oheimb@2649
  1251
wenzelm@3006
  1252
paulson@3002
  1253
*** ZF ***
wenzelm@2553
  1254
paulson@2865
  1255
* ZF now has Fast_tac, Simp_tac and Auto_tac.  Union_iff is a now a default
paulson@2865
  1256
rewrite rule; this may affect some proofs.  eq_cs is gone but can be put back
paulson@2865
  1257
as ZF_cs addSIs [equalityI];
wenzelm@2553
  1258
wenzelm@2554
  1259
wenzelm@2732
  1260
wenzelm@2553
  1261
New in Isabelle94-7 (November 96)
wenzelm@2553
  1262
---------------------------------
wenzelm@2553
  1263
wenzelm@2553
  1264
* allowing negative levels (as offsets) in prlev and choplev;
wenzelm@2553
  1265
wenzelm@2554
  1266
* super-linear speedup for large simplifications;
wenzelm@2554
  1267
wenzelm@2554
  1268
* FOL, ZF and HOL now use miniscoping: rewriting pushes
wenzelm@2554
  1269
quantifications in as far as possible (COULD MAKE EXISTING PROOFS
wenzelm@2554
  1270
FAIL); can suppress it using the command Delsimps (ex_simps @
wenzelm@2554
  1271
all_simps); De Morgan laws are also now included, by default;
wenzelm@2554
  1272
wenzelm@2554
  1273
* improved printing of ==>  :  ~:
wenzelm@2554
  1274
wenzelm@2554
  1275
* new object-logic "Sequents" adds linear logic, while replacing LK
wenzelm@2554
  1276
and Modal (thanks to Sara Kalvala);
wenzelm@2554
  1277
wenzelm@2554
  1278
* HOL/Auth: correctness proofs for authentication protocols;
wenzelm@2554
  1279
wenzelm@2554
  1280
* HOL: new auto_tac combines rewriting and classical reasoning (many
wenzelm@2554
  1281
examples on HOL/Auth);
wenzelm@2554
  1282
wenzelm@2554
  1283
* HOL: new command AddIffs for declaring theorems of the form P=Q to
wenzelm@2554
  1284
the rewriter and classical reasoner simultaneously;
wenzelm@2554
  1285
wenzelm@2554
  1286
* function uresult no longer returns theorems in "standard" format;
wenzelm@2554
  1287
regain previous version by: val uresult = standard o uresult;
wenzelm@2554
  1288
wenzelm@2554
  1289
wenzelm@2554
  1290
wenzelm@2554
  1291
New in Isabelle94-6
wenzelm@2554
  1292
-------------------
wenzelm@2554
  1293
wenzelm@2554
  1294
* oracles -- these establish an interface between Isabelle and trusted
wenzelm@2554
  1295
external reasoners, which may deliver results as theorems;
wenzelm@2554
  1296
wenzelm@2554
  1297
* proof objects (in particular record all uses of oracles);
wenzelm@2554
  1298
wenzelm@2554
  1299
* Simp_tac, Fast_tac, etc. that refer to implicit simpset / claset;
wenzelm@2554
  1300
wenzelm@2554
  1301
* "constdefs" section in theory files;
wenzelm@2554
  1302
wenzelm@2554
  1303
* "primrec" section (HOL) no longer requires names;
wenzelm@2554
  1304
wenzelm@2554
  1305
* internal type "tactic" now simply "thm -> thm Sequence.seq";
wenzelm@2554
  1306
wenzelm@2554
  1307
wenzelm@2554
  1308
wenzelm@2554
  1309
New in Isabelle94-5
wenzelm@2554
  1310
-------------------
wenzelm@2554
  1311
wenzelm@2554
  1312
* reduced space requirements;
wenzelm@2554
  1313
wenzelm@2554
  1314
* automatic HTML generation from theories;
wenzelm@2554
  1315
wenzelm@2554
  1316
* theory files no longer require "..." (quotes) around most types;
wenzelm@2554
  1317
wenzelm@2554
  1318
* new examples, including two proofs of the Church-Rosser theorem;
wenzelm@2554
  1319
wenzelm@2554
  1320
* non-curried (1994) version of HOL is no longer distributed;
wenzelm@2554
  1321
wenzelm@2553
  1322
paulson@2557
  1323
paulson@2557
  1324
New in Isabelle94-4
paulson@2557
  1325
-------------------
paulson@2557
  1326
paulson@2747
  1327
* greatly reduced space requirements;
paulson@2557
  1328
paulson@2557
  1329
* theory files (.thy) no longer require \...\ escapes at line breaks;
paulson@2557
  1330
wenzelm@5726
  1331
* searchable theorem database (see the section "Retrieving theorems" on
paulson@2557
  1332
page 8 of the Reference Manual);
paulson@2557
  1333
paulson@2557
  1334
* new examples, including Grabczewski's monumental case study of the
paulson@2557
  1335
Axiom of Choice;
paulson@2557
  1336
paulson@2557
  1337
* The previous version of HOL renamed to Old_HOL;
paulson@2557
  1338
wenzelm@5726
  1339
* The new version of HOL (previously called CHOL) uses a curried syntax
paulson@2557
  1340
for functions.  Application looks like f a b instead of f(a,b);
paulson@2557
  1341
paulson@2557
  1342
* Mutually recursive inductive definitions finally work in HOL;
paulson@2557
  1343
paulson@2557
  1344
* In ZF, pattern-matching on tuples is now available in all abstractions and
paulson@2557
  1345
translates to the operator "split";
paulson@2557
  1346
paulson@2557
  1347
paulson@2557
  1348
paulson@2557
  1349
New in Isabelle94-3
paulson@2557
  1350
-------------------
paulson@2557
  1351
wenzelm@5726
  1352
* new infix operator, addss, allowing the classical reasoner to
paulson@2557
  1353
perform simplification at each step of its search.  Example:
wenzelm@5726
  1354
        fast_tac (cs addss ss)
paulson@2557
  1355
wenzelm@5726
  1356
* a new logic, CHOL, the same as HOL, but with a curried syntax
wenzelm@5726
  1357
for functions.  Application looks like f a b instead of f(a,b).  Also pairs
paulson@2557
  1358
look like (a,b) instead of <a,b>;
paulson@2557
  1359
paulson@2557
  1360
* PLEASE NOTE: CHOL will eventually replace HOL!
paulson@2557
  1361
paulson@2557
  1362
* In CHOL, pattern-matching on tuples is now available in all abstractions.
paulson@2557
  1363
It translates to the operator "split".  A new theory of integers is available;
paulson@2557
  1364
paulson@2557
  1365
* In ZF, integer numerals now denote two's-complement binary integers.
paulson@2557
  1366
Arithmetic operations can be performed by rewriting.  See ZF/ex/Bin.ML;
paulson@2557
  1367
wenzelm@5726
  1368
* Many new examples: I/O automata, Church-Rosser theorem, equivalents
paulson@2557
  1369
of the Axiom of Choice;
paulson@2557
  1370
paulson@2557
  1371
paulson@2557
  1372
paulson@2557
  1373
New in Isabelle94-2
paulson@2557
  1374
-------------------
paulson@2557
  1375
wenzelm@5726
  1376
* Significantly faster resolution;
paulson@2557
  1377
paulson@2557
  1378
* the different sections in a .thy file can now be mixed and repeated
paulson@2557
  1379
freely;
paulson@2557
  1380
paulson@2557
  1381
* Database of theorems for FOL, HOL and ZF.  New
paulson@2557
  1382
commands including qed, qed_goal and bind_thm store theorems in the database.
paulson@2557
  1383
paulson@2557
  1384
* Simple database queries: return a named theorem (get_thm) or all theorems of
paulson@2557
  1385
a given theory (thms_of), or find out what theory a theorem was proved in
paulson@2557
  1386
(theory_of_thm);
paulson@2557
  1387
paulson@2557
  1388
* Bugs fixed in the inductive definition and datatype packages;
paulson@2557
  1389
paulson@2557
  1390
* The classical reasoner provides deepen_tac and depth_tac, making FOL_dup_cs
paulson@2557
  1391
and HOL_dup_cs obsolete;
paulson@2557
  1392
paulson@2557
  1393
* Syntactic ambiguities caused by the new treatment of syntax in Isabelle94-1
paulson@2557
  1394
have been removed;
paulson@2557
  1395
paulson@2557
  1396
* Simpler definition of function space in ZF;
paulson@2557
  1397
paulson@2557
  1398
* new results about cardinal and ordinal arithmetic in ZF;
paulson@2557
  1399
paulson@2557
  1400
* 'subtype' facility in HOL for introducing new types as subsets of existing
paulson@2557
  1401
types;
paulson@2557
  1402
paulson@2557
  1403
wenzelm@2553
  1404
$Id$