NEWS
author ballarin
Fri Aug 29 15:40:11 2003 +0200 (2003-08-29)
changeset 14175 dbd16ebaf907
parent 14173 a3690aeb79d4
child 14199 d3b8d972a488
permissions -rw-r--r--
Method rule_tac understands Isar contexts: documentation.
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Isabelle NEWS -- history user-relevant changes
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==============================================
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New in this Isabelle release
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----------------------------
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*** General ***
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* Pure: Greek letters (except small lambda, \<lambda>), as well as gothic
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  (\<aa>...\<zz>\<AA>...\<ZZ>), caligraphic (\<A>...\<Z>), and euler
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  (\<a>...\<z>), are now considered normal letters, and can therefore
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  be used anywhere where an ASCII letter (a...zA...Z) has until
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  now. COMPATIBILITY: This obviously changes the parsing of some
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  terms, especially where a symbol has been used as a binder, say
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  '\<Pi>x. ...', which is now a type error since \<Pi>x will be parsed
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  as an identifier.  Fix it by inserting a space around former
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  symbols.  Call 'isatool fixgreek' to try to fix parsing errors in
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  existing theory and ML files.
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*** Isar ***
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* Tactic emulation methods ?rule_tac, cut_tac, subgoal_tac and thin_tac:
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  - Now understand static (Isar) contexts.  As a consequence, users of Isar
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    locales are no longer forced to write Isar proof scripts.
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    For details see Isar Reference Manual, paragraph 4.3.2: Further tactic
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    emulations.
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  - INCOMPATIBILITY: names of variables to be instantiated may no
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    longer be enclosed in quotes.  Instead, precede variable names containing
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    dots with `?'.  This is consistent with the instantiation attribute
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    "where".
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* HOL: Tactic emulation methods induct_tac and case_tac understand static
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  (Isar) contexts.
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*** HOL ***
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* 'specification' command added, allowing for definition by
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specification.
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New in Isabelle2003 (May 2003)
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--------------------------------
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*** General ***
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* Provers/simplifier:
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  - Completely reimplemented method simp (ML: Asm_full_simp_tac):
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    Assumptions are now subject to complete mutual simplification,
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    not just from left to right. The simplifier now preserves
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    the order of assumptions.
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    Potential INCOMPATIBILITY:
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    -- simp sometimes diverges where the old version did
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       not, e.g. invoking simp on the goal
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        [| P (f x); y = x; f x = f y |] ==> Q
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       now gives rise to the infinite reduction sequence
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        P(f x) --(f x = f y)--> P(f y) --(y = x)--> P(f x) --(f x = f y)--> ...
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       Using "simp (asm_lr)" (ML: Asm_lr_simp_tac) instead often solves this
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       kind of problem.
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    -- Tactics combining classical reasoner and simplification (such as auto)
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       are also affected by this change, because many of them rely on
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       simp. They may sometimes diverge as well or yield a different numbers
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       of subgoals. Try to use e.g. force, fastsimp, or safe instead of auto
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       in case of problems. Sometimes subsequent calls to the classical
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       reasoner will fail because a preceeding call to the simplifier too
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       eagerly simplified the goal, e.g. deleted redundant premises.
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  - The simplifier trace now shows the names of the applied rewrite rules
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  - You can limit the number of recursive invocations of the simplifier
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    during conditional rewriting (where the simplifie tries to solve the
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    conditions before applying the rewrite rule):
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    ML "simp_depth_limit := n"
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    where n is an integer. Thus you can force termination where previously
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    the simplifier would diverge.
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  - Accepts free variables as head terms in congruence rules.  Useful in Isar.
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  - No longer aborts on failed congruence proof.  Instead, the
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    congruence is ignored.
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* Pure: New generic framework for extracting programs from constructive
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  proofs. See HOL/Extraction.thy for an example instantiation, as well
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  as HOL/Extraction for some case studies.
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* Pure: The main goal of the proof state is no longer shown by default, only
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the subgoals. This behaviour is controlled by a new flag.
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   PG menu: Isabelle/Isar -> Settings -> Show Main Goal
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(ML: Proof.show_main_goal).
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* Pure: You can find all matching introduction rules for subgoal 1, i.e. all
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rules whose conclusion matches subgoal 1:
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      PG menu: Isabelle/Isar -> Show me -> matching rules
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The rules are ordered by how closely they match the subgoal.
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In particular, rules that solve a subgoal outright are displayed first
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(or rather last, the way they are printed).
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(ML: ProofGeneral.print_intros())
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* Pure: New flag trace_unify_fail causes unification to print
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diagnostic information (PG: in trace buffer) when it fails. This is
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useful for figuring out why single step proofs like rule, erule or
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assumption failed.
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* Pure: Locale specifications now produce predicate definitions
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according to the body of text (covering assumptions modulo local
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definitions); predicate "loc_axioms" covers newly introduced text,
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while "loc" is cumulative wrt. all included locale expressions; the
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latter view is presented only on export into the global theory
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context; potential INCOMPATIBILITY, use "(open)" option to fall back
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on the old view without predicates;
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* Pure: predefined locales "var" and "struct" are useful for sharing
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parameters (as in CASL, for example); just specify something like
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``var x + var y + struct M'' as import;
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* Pure: improved thms_containing: proper indexing of facts instead of
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raw theorems; check validity of results wrt. current name space;
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include local facts of proof configuration (also covers active
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locales), cover fixed variables in index; may use "_" in term
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specification; an optional limit for the number of printed facts may
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be given (the default is 40);
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* Pure: disallow duplicate fact bindings within new-style theory files
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(batch-mode only);
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* Provers: improved induct method: assumptions introduced by case
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"foo" are split into "foo.hyps" (from the rule) and "foo.prems" (from
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the goal statement); "foo" still refers to all facts collectively;
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* Provers: the function blast.overloaded has been removed: all constants
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are regarded as potentially overloaded, which improves robustness in exchange
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for slight decrease in efficiency;
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* Provers/linorder: New generic prover for transitivity reasoning over
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linear orders.  Note: this prover is not efficient!
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* Isar: preview of problems to finish 'show' now produce an error
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rather than just a warning (in interactive mode);
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*** HOL ***
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* arith(_tac)
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 - Produces a counter example if it cannot prove a goal.
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   Note that the counter example may be spurious if the goal is not a formula
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   of quantifier-free linear arithmetic.
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   In ProofGeneral the counter example appears in the trace buffer.
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 - Knows about div k and mod k where k is a numeral of type nat or int.
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 - Calls full Presburger arithmetic (by Amine Chaieb) if quantifier-free
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   linear arithmetic fails. This takes account of quantifiers and divisibility.
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   Presburger arithmetic can also be called explicitly via presburger(_tac). 
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* simp's arithmetic capabilities have been enhanced a bit: it now
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takes ~= in premises into account (by performing a case split);
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* simp reduces "m*(n div m) + n mod m" to n, even if the two summands
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are distributed over a sum of terms;
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* New tactic "trans_tac" and method "trans" instantiate
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Provers/linorder.ML for axclasses "order" and "linorder" (predicates
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"<=", "<" and "="). 
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* function INCOMPATIBILITIES: Pi-sets have been redefined and moved from main 
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HOL to Library/FuncSet; constant "Fun.op o" is now called "Fun.comp";
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* 'typedef' command has new option "open" to suppress the set
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definition;
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* functions Min and Max on finite sets have been introduced (theory
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Finite_Set);
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* attribute [symmetric] now works for relations as well; it turns
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(x,y) : R^-1 into (y,x) : R, and vice versa;
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* induct over a !!-quantified statement (say !!x1..xn):
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  each "case" automatically performs "fix x1 .. xn" with exactly those names.
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* Map: `empty' is no longer a constant but a syntactic abbreviation for
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%x. None. Warning: empty_def now refers to the previously hidden definition
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of the empty set.
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* Algebra: formalization of classical algebra.  Intended as base for
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any algebraic development in Isabelle.  Currently covers group theory
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(up to Sylow's theorem) and ring theory (Universal Property of
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Univariate Polynomials).  Contributions welcome;
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* GroupTheory: deleted, since its material has been moved to Algebra;
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* Complex: new directory of the complex numbers with numeric constants, 
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nonstandard complex numbers, and some complex analysis, standard and 
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nonstandard (Jacques Fleuriot);
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* HOL-Complex: new image for analysis, replacing HOL-Real and HOL-Hyperreal;
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* Hyperreal: introduced Gauge integration and hyperreal logarithms (Jacques 
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Fleuriot);
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* Real/HahnBanach: updated and adapted to locales;
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* NumberTheory: added Gauss's law of quadratic reciprocity (by Avigad,
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Gray and Kramer);
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* UNITY: added the Meier-Sanders theory of progress sets;
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* MicroJava: bytecode verifier and lightweight bytecode verifier
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as abstract algorithms, instantiated to the JVM;
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* Bali: Java source language formalization. Type system, operational
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semantics, axiomatic semantics. Supported language features:
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classes, interfaces, objects,virtual methods, static methods,
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static/instance fields, arrays, access modifiers, definite
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assignment, exceptions.
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*** ZF ***
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* ZF/Constructible: consistency proof for AC (Gödel's constructible
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universe, etc.);
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* Main ZF: virtually all theories converted to new-style format;
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*** ML ***
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* Pure: Tactic.prove provides sane interface for internal proofs;
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omits the infamous "standard" operation, so this is more appropriate
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than prove_goalw_cterm in many situations (e.g. in simprocs);
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* Pure: improved error reporting of simprocs;
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* Provers: Simplifier.simproc(_i) provides sane interface for setting
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up simprocs;
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*** Document preparation ***
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* uses \par instead of \\ for line breaks in theory text. This may
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shift some page breaks in large documents. To get the old behaviour
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use \renewcommand{\isanewline}{\mbox{}\\\mbox{}} in root.tex.
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* minimized dependencies of isabelle.sty and isabellesym.sty on 
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other packages
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* \<euro> now needs package babel/greek instead of marvosym (which
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broke \Rightarrow)
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* normal size for \<zero>...\<nine> (uses \mathbf instead of 
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textcomp package)
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New in Isabelle2002 (March 2002)
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--------------------------------
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*** Document preparation ***
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* greatly simplified document preparation setup, including more
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graceful interpretation of isatool usedir -i/-d/-D options, and more
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instructive isatool mkdir; users should basically be able to get
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started with "isatool mkdir HOL Test && isatool make"; alternatively,
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users may run a separate document processing stage manually like this:
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"isatool usedir -D output HOL Test && isatool document Test/output";
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* theory dependency graph may now be incorporated into documents;
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isatool usedir -g true will produce session_graph.eps/.pdf for use
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with \includegraphics of LaTeX;
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* proper spacing of consecutive markup elements, especially text
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blocks after section headings;
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* support bold style (for single symbols only), input syntax is like
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this: "\<^bold>\<alpha>" or "\<^bold>A";
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* \<bullet> is now output as bold \cdot by default, which looks much
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better in printed text;
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* added default LaTeX bindings for \<tturnstile> and \<TTurnstile>;
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note that these symbols are currently unavailable in Proof General /
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X-Symbol; new symbols \<zero>, \<one>, ..., \<nine>, and \<euro>;
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* isatool latex no longer depends on changed TEXINPUTS, instead
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isatool document copies the Isabelle style files to the target
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location;
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*** Isar ***
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* Pure/Provers: improved proof by cases and induction;
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  - 'case' command admits impromptu naming of parameters (such as
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    "case (Suc n)");
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  - 'induct' method divinates rule instantiation from the inductive
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    claim; no longer requires excessive ?P bindings for proper
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    instantiation of cases;
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  - 'induct' method properly enumerates all possibilities of set/type
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    rules; as a consequence facts may be also passed through *type*
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    rules without further ado;
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  - 'induct' method now derives symbolic cases from the *rulified*
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    rule (before it used to rulify cases stemming from the internal
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    atomized version); this means that the context of a non-atomic
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    statement becomes is included in the hypothesis, avoiding the
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    slightly cumbersome show "PROP ?case" form;
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  - 'induct' may now use elim-style induction rules without chaining
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    facts, using ``missing'' premises from the goal state; this allows
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    rules stemming from inductive sets to be applied in unstructured
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    scripts, while still benefitting from proper handling of non-atomic
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    statements; NB: major inductive premises need to be put first, all
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    the rest of the goal is passed through the induction;
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  - 'induct' proper support for mutual induction involving non-atomic
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    rule statements (uses the new concept of simultaneous goals, see
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    below);
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  - append all possible rule selections, but only use the first
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    success (no backtracking);
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  - removed obsolete "(simplified)" and "(stripped)" options of methods;
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  - undeclared rule case names default to numbers 1, 2, 3, ...;
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  - added 'print_induct_rules' (covered by help item in recent Proof
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    General versions);
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  - moved induct/cases attributes to Pure, methods to Provers;
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  - generic method setup instantiated for FOL and HOL;
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* Pure: support multiple simultaneous goal statements, for example
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"have a: A and b: B" (same for 'theorem' etc.); being a pure
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meta-level mechanism, this acts as if several individual goals had
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been stated separately; in particular common proof methods need to be
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repeated in order to cover all claims; note that a single elimination
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step is *not* sufficient to establish the two conjunctions, so this
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fails:
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  assume "A & B" then have A and B ..   (*".." fails*)
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better use "obtain" in situations as above; alternative refer to
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multi-step methods like 'auto', 'simp_all', 'blast+' etc.;
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* Pure: proper integration with ``locales''; unlike the original
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version by Florian Kammüller, Isar locales package high-level proof
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contexts rather than raw logical ones (e.g. we admit to include
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attributes everywhere); operations on locales include merge and
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rename; support for implicit arguments (``structures''); simultaneous
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type-inference over imports and text; see also HOL/ex/Locales.thy for
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some examples;
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* Pure: the following commands have been ``localized'', supporting a
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target locale specification "(in name)": 'lemma', 'theorem',
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'corollary', 'lemmas', 'theorems', 'declare'; the results will be
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stored both within the locale and at the theory level (exported and
wenzelm@12707
   355
qualified by the locale name);
wenzelm@12707
   356
wenzelm@12964
   357
* Pure: theory goals may now be specified in ``long'' form, with
wenzelm@12964
   358
ad-hoc contexts consisting of arbitrary locale elements. for example
wenzelm@12964
   359
``lemma foo: fixes x assumes "A x" shows "B x"'' (local syntax and
wenzelm@12964
   360
definitions may be given, too); the result is a meta-level rule with
wenzelm@12964
   361
the context elements being discharged in the obvious way;
wenzelm@12964
   362
wenzelm@12964
   363
* Pure: new proof command 'using' allows to augment currently used
wenzelm@12964
   364
facts after a goal statement ('using' is syntactically analogous to
wenzelm@12964
   365
'apply', but acts on the goal's facts only); this allows chained facts
wenzelm@12964
   366
to be separated into parts given before and after a claim, as in
wenzelm@12964
   367
``from a and b have C using d and e <proof>'';
wenzelm@12078
   368
wenzelm@11722
   369
* Pure: renamed "antecedent" case to "rule_context";
wenzelm@11722
   370
wenzelm@12964
   371
* Pure: new 'judgment' command records explicit information about the
wenzelm@12964
   372
object-logic embedding (used by several tools internally); no longer
wenzelm@12964
   373
use hard-wired "Trueprop";
wenzelm@12964
   374
wenzelm@11738
   375
* Pure: added 'corollary' command;
wenzelm@11738
   376
wenzelm@11722
   377
* Pure: fixed 'token_translation' command;
wenzelm@11722
   378
wenzelm@11899
   379
* Pure: removed obsolete 'exported' attribute;
wenzelm@11899
   380
wenzelm@11933
   381
* Pure: dummy pattern "_" in is/let is now automatically lifted over
wenzelm@11933
   382
bound variables: "ALL x. P x --> Q x" (is "ALL x. _ --> ?C x")
wenzelm@11899
   383
supersedes more cumbersome ... (is "ALL x. _ x --> ?C x");
wenzelm@11899
   384
wenzelm@11952
   385
* Pure: method 'atomize' presents local goal premises as object-level
wenzelm@11952
   386
statements (atomic meta-level propositions); setup controlled via
wenzelm@11952
   387
rewrite rules declarations of 'atomize' attribute; example
wenzelm@11952
   388
application: 'induct' method with proper rule statements in improper
wenzelm@11952
   389
proof *scripts*;
wenzelm@11952
   390
wenzelm@12106
   391
* Pure: emulation of instantiation tactics (rule_tac, cut_tac, etc.)
wenzelm@12106
   392
now consider the syntactic context of assumptions, giving a better
wenzelm@12106
   393
chance to get type-inference of the arguments right (this is
wenzelm@12106
   394
especially important for locales);
wenzelm@12106
   395
wenzelm@12312
   396
* Pure: "sorry" no longer requires quick_and_dirty in interactive
wenzelm@12312
   397
mode;
wenzelm@12312
   398
wenzelm@12405
   399
* Pure/obtain: the formal conclusion "thesis", being marked as
wenzelm@12405
   400
``internal'', may no longer be reference directly in the text;
wenzelm@12405
   401
potential INCOMPATIBILITY, may need to use "?thesis" in rare
wenzelm@12405
   402
situations;
wenzelm@12405
   403
wenzelm@12405
   404
* Pure: generic 'sym' attribute which declares a rule both as pure
wenzelm@12405
   405
'elim?' and for the 'symmetric' operation;
wenzelm@12405
   406
wenzelm@12877
   407
* Pure: marginal comments ``--'' may now occur just anywhere in the
wenzelm@12877
   408
text; the fixed correlation with particular command syntax has been
wenzelm@12877
   409
discontinued;
wenzelm@12877
   410
berghofe@13023
   411
* Pure: new method 'rules' is particularly well-suited for proof
berghofe@13023
   412
search in intuitionistic logic; a bit slower than 'blast' or 'fast',
berghofe@13023
   413
but often produces more compact proof terms with less detours;
berghofe@13023
   414
wenzelm@12364
   415
* Pure/Provers/classical: simplified integration with pure rule
wenzelm@12364
   416
attributes and methods; the classical "intro?/elim?/dest?"
wenzelm@12364
   417
declarations coincide with the pure ones; the "rule" method no longer
wenzelm@12364
   418
includes classically swapped intros; "intro" and "elim" methods no
wenzelm@12364
   419
longer pick rules from the context; also got rid of ML declarations
wenzelm@12364
   420
AddXIs/AddXEs/AddXDs; all of this has some potential for
wenzelm@12364
   421
INCOMPATIBILITY;
wenzelm@12364
   422
wenzelm@12405
   423
* Provers/classical: attribute 'swapped' produces classical inversions
wenzelm@12405
   424
of introduction rules;
wenzelm@12405
   425
wenzelm@12364
   426
* Provers/simplifier: 'simplified' attribute may refer to explicit
wenzelm@12364
   427
rules instead of full simplifier context; 'iff' attribute handles
wenzelm@12364
   428
conditional rules;
wenzelm@11936
   429
wenzelm@11745
   430
* HOL: 'typedef' now allows alternative names for Rep/Abs morphisms;
wenzelm@11745
   431
wenzelm@11690
   432
* HOL: 'recdef' now fails on unfinished automated proofs, use
wenzelm@11633
   433
"(permissive)" option to recover old behavior;
wenzelm@11633
   434
wenzelm@11933
   435
* HOL: 'inductive' no longer features separate (collective) attributes
wenzelm@11933
   436
for 'intros' (was found too confusing);
wenzelm@11933
   437
wenzelm@12405
   438
* HOL: properly declared induction rules less_induct and
wenzelm@12405
   439
wf_induct_rule;
wenzelm@12405
   440
kleing@11788
   441
wenzelm@11474
   442
*** HOL ***
wenzelm@11474
   443
wenzelm@11702
   444
* HOL: moved over to sane numeral syntax; the new policy is as
wenzelm@11702
   445
follows:
wenzelm@11702
   446
wenzelm@11702
   447
  - 0 and 1 are polymorphic constants, which are defined on any
wenzelm@11702
   448
  numeric type (nat, int, real etc.);
wenzelm@11702
   449
wenzelm@11702
   450
  - 2, 3, 4, ... and -1, -2, -3, ... are polymorphic numerals, based
wenzelm@11702
   451
  binary representation internally;
wenzelm@11702
   452
wenzelm@11702
   453
  - type nat has special constructor Suc, and generally prefers Suc 0
wenzelm@11702
   454
  over 1::nat and Suc (Suc 0) over 2::nat;
wenzelm@11702
   455
wenzelm@12364
   456
This change may cause significant problems of INCOMPATIBILITY; here
wenzelm@12364
   457
are some hints on converting existing sources:
wenzelm@11702
   458
wenzelm@11702
   459
  - due to the new "num" token, "-0" and "-1" etc. are now atomic
wenzelm@11702
   460
  entities, so expressions involving "-" (unary or binary minus) need
wenzelm@11702
   461
  to be spaced properly;
wenzelm@11702
   462
wenzelm@11702
   463
  - existing occurrences of "1" may need to be constraint "1::nat" or
wenzelm@11702
   464
  even replaced by Suc 0; similar for old "2";
wenzelm@11702
   465
wenzelm@11702
   466
  - replace "#nnn" by "nnn", and "#-nnn" by "-nnn";
wenzelm@11702
   467
wenzelm@11702
   468
  - remove all special provisions on numerals in proofs;
wenzelm@11702
   469
wenzelm@13042
   470
* HOL: simp rules nat_number expand numerals on nat to Suc/0
wenzelm@12837
   471
representation (depends on bin_arith_simps in the default context);
wenzelm@12837
   472
wenzelm@12736
   473
* HOL: symbolic syntax for x^2 (numeral 2);
wenzelm@12736
   474
wenzelm@12335
   475
* HOL: the class of all HOL types is now called "type" rather than
wenzelm@12335
   476
"term"; INCOMPATIBILITY, need to adapt references to this type class
wenzelm@12335
   477
in axclass/classes, instance/arities, and (usually rare) occurrences
wenzelm@12335
   478
in typings (of consts etc.); internally the class is called
wenzelm@12335
   479
"HOL.type", ML programs should refer to HOLogic.typeS;
wenzelm@12335
   480
wenzelm@12280
   481
* HOL/record package improvements:
wenzelm@12280
   482
  - new derived operations "fields" to build a partial record section,
wenzelm@12280
   483
    "extend" to promote a fixed record to a record scheme, and
wenzelm@12280
   484
    "truncate" for the reverse; cf. theorems "xxx.defs", which are *not*
wenzelm@12280
   485
    declared as simp by default;
wenzelm@12587
   486
  - shared operations ("more", "fields", etc.) now need to be always
wenzelm@12587
   487
    qualified) --- potential INCOMPATIBILITY;
wenzelm@12280
   488
  - removed "make_scheme" operations (use "make" with "extend") --
wenzelm@12280
   489
    INCOMPATIBILITY;
wenzelm@11937
   490
  - removed "more" class (simply use "term") -- INCOMPATIBILITY;
wenzelm@12253
   491
  - provides cases/induct rules for use with corresponding Isar
wenzelm@12253
   492
    methods (for concrete records, record schemes, concrete more
wenzelm@12280
   493
    parts, and schematic more parts -- in that order);
wenzelm@11930
   494
  - internal definitions directly based on a light-weight abstract
wenzelm@11930
   495
    theory of product types over typedef rather than datatype;
wenzelm@11930
   496
berghofe@13023
   497
* HOL: generic code generator for generating executable ML code from
berghofe@13023
   498
specifications; specific support for HOL constructs such as inductive
berghofe@13023
   499
datatypes and sets, as well as recursive functions; can be invoked
berghofe@13023
   500
via 'generate_code' theory section;
berghofe@13023
   501
wenzelm@11933
   502
* HOL: canonical cases/induct rules for n-tuples (n = 3..7);
wenzelm@11933
   503
paulson@13824
   504
* HOL: consolidated and renamed several theories.  In particular:
paulson@13824
   505
	Ord.thy has been absorbed into HOL.thy
paulson@13824
   506
	String.thy has been absorbed into List.thy
paulson@13824
   507
 
wenzelm@11802
   508
* HOL: concrete setsum syntax "\<Sum>i:A. b" == "setsum (%i. b) A"
wenzelm@11802
   509
(beware of argument permutation!);
wenzelm@11802
   510
wenzelm@11657
   511
* HOL: linorder_less_split superseded by linorder_cases;
wenzelm@11657
   512
wenzelm@12917
   513
* HOL/List: "nodups" renamed to "distinct";
nipkow@12889
   514
wenzelm@11633
   515
* HOL: added "The" definite description operator; move Hilbert's "Eps"
paulson@13824
   516
to peripheral theory "Hilbert_Choice"; some INCOMPATIBILITIES:
paulson@13824
   517
  - Ex_def has changed, now need to use some_eq_ex
wenzelm@11437
   518
wenzelm@11572
   519
* HOL: made split_all_tac safe; EXISTING PROOFS MAY FAIL OR LOOP, so
wenzelm@11572
   520
in this (rare) case use:
wenzelm@11572
   521
wenzelm@11572
   522
  delSWrapper "split_all_tac"
wenzelm@11572
   523
  addSbefore ("unsafe_split_all_tac", unsafe_split_all_tac)
wenzelm@11572
   524
wenzelm@11572
   525
* HOL: added safe wrapper "split_conv_tac" to claset; EXISTING PROOFS
wenzelm@11474
   526
MAY FAIL;
nipkow@11361
   527
wenzelm@11572
   528
* HOL: introduced f^n = f o ... o f; warning: due to the limits of
wenzelm@11572
   529
Isabelle's type classes, ^ on functions and relations has too general
wenzelm@11572
   530
a domain, namely ('a * 'b) set and 'a => 'b; this means that it may be
wenzelm@11572
   531
necessary to attach explicit type constraints;
nipkow@11307
   532
wenzelm@12917
   533
* HOL/Relation: the prefix name of the infix "O" has been changed from
wenzelm@12917
   534
"comp" to "rel_comp"; INCOMPATIBILITY: a few theorems have been
wenzelm@12917
   535
renamed accordingly (eg "compI" -> "rel_compI").
nipkow@12489
   536
wenzelm@11487
   537
* HOL: syntax translations now work properly with numerals and records
wenzelm@11487
   538
expressions;
wenzelm@11474
   539
wenzelm@12457
   540
* HOL: bounded abstraction now uses syntax "%" / "\<lambda>" instead
wenzelm@12457
   541
of "lam" -- INCOMPATIBILITY;
wenzelm@11474
   542
wenzelm@11933
   543
* HOL: got rid of some global declarations (potential INCOMPATIBILITY
wenzelm@11933
   544
for ML tools): const "()" renamed "Product_Type.Unity", type "unit"
wenzelm@11933
   545
renamed "Product_Type.unit";
wenzelm@11611
   546
nipkow@12564
   547
* HOL: renamed rtrancl_into_rtrancl2 to converse_rtrancl_into_rtrancl
nipkow@12564
   548
wenzelm@12924
   549
* HOL: removed obsolete theorem "optionE" (use "option.exhaust", or
wenzelm@12924
   550
the "cases" method);
wenzelm@12924
   551
wenzelm@12597
   552
* HOL/GroupTheory: group theory examples including Sylow's theorem (by
wenzelm@12597
   553
Florian Kammüller);
wenzelm@12597
   554
wenzelm@12608
   555
* HOL/IMP: updated and converted to new-style theory format; several
wenzelm@12608
   556
parts turned into readable document, with proper Isar proof texts and
wenzelm@12608
   557
some explanations (by Gerwin Klein);
wenzelm@12597
   558
wenzelm@12734
   559
* HOL-Real: added Complex_Numbers (by Gertrud Bauer);
wenzelm@12734
   560
wenzelm@12690
   561
* HOL-Hyperreal is now a logic image;
wenzelm@12690
   562
wenzelm@11611
   563
wenzelm@12022
   564
*** HOLCF ***
wenzelm@12022
   565
wenzelm@12622
   566
* Isar: consts/constdefs supports mixfix syntax for continuous
wenzelm@12622
   567
operations;
wenzelm@12622
   568
wenzelm@12622
   569
* Isar: domain package adapted to new-style theory format, e.g. see
wenzelm@12622
   570
HOLCF/ex/Dnat.thy;
wenzelm@12622
   571
wenzelm@12622
   572
* theory Lift: proper use of rep_datatype lift instead of ML hacks --
wenzelm@12280
   573
potential INCOMPATIBILITY; now use plain induct_tac instead of former
wenzelm@12280
   574
lift.induct_tac, always use UU instead of Undef;
wenzelm@12022
   575
wenzelm@12597
   576
* HOLCF/IMP: updated and converted to new-style theory;
wenzelm@12597
   577
wenzelm@12022
   578
wenzelm@11474
   579
*** ZF ***
wenzelm@11474
   580
wenzelm@12622
   581
* Isar: proper integration of logic-specific tools and packages,
wenzelm@12622
   582
including theory commands '(co)inductive', '(co)datatype',
wenzelm@12622
   583
'rep_datatype', 'inductive_cases', as well as methods 'ind_cases',
wenzelm@12622
   584
'induct_tac', 'case_tac', and 'typecheck' (with attribute 'TC');
wenzelm@12622
   585
wenzelm@12622
   586
* theory Main no longer includes AC; for the Axiom of Choice, base
wenzelm@12622
   587
your theory on Main_ZFC;
wenzelm@12622
   588
wenzelm@12622
   589
* the integer library now covers quotients and remainders, with many
wenzelm@12622
   590
laws relating division to addition, multiplication, etc.;
paulson@12563
   591
wenzelm@12280
   592
* ZF/UNITY: Chandy and Misra's UNITY is now available in ZF, giving a
wenzelm@12280
   593
typeless version of the formalism;
wenzelm@12280
   594
wenzelm@13025
   595
* ZF/AC, Coind, IMP, Resid: updated and converted to new-style theory
wenzelm@13025
   596
format;
wenzelm@12608
   597
wenzelm@12280
   598
* ZF/Induct: new directory for examples of inductive definitions,
wenzelm@12608
   599
including theory Multiset for multiset orderings; converted to
wenzelm@12608
   600
new-style theory format;
wenzelm@12177
   601
wenzelm@13025
   602
* ZF: many new theorems about lists, ordinals, etc.;
paulson@12850
   603
wenzelm@11474
   604
wenzelm@11474
   605
*** General ***
wenzelm@11474
   606
wenzelm@12280
   607
* Pure/kernel: meta-level proof terms (by Stefan Berghofer); reference
wenzelm@12280
   608
variable proof controls level of detail: 0 = no proofs (only oracle
wenzelm@12280
   609
dependencies), 1 = lemma dependencies, 2 = compact proof terms; see
wenzelm@12280
   610
also ref manual for further ML interfaces;
wenzelm@12280
   611
wenzelm@12280
   612
* Pure/axclass: removed obsolete ML interface
wenzelm@12280
   613
goal_subclass/goal_arity;
wenzelm@12280
   614
wenzelm@12280
   615
* Pure/syntax: new token syntax "num" for plain numerals (without "#"
wenzelm@12280
   616
of "xnum"); potential INCOMPATIBILITY, since -0, -1 etc. are now
wenzelm@12280
   617
separate tokens, so expressions involving minus need to be spaced
wenzelm@12280
   618
properly;
wenzelm@12280
   619
wenzelm@12312
   620
* Pure/syntax: support non-oriented infixes, using keyword "infix"
wenzelm@12312
   621
rather than "infixl" or "infixr";
wenzelm@12312
   622
wenzelm@12312
   623
* Pure/syntax: concrete syntax for dummy type variables admits genuine
wenzelm@12312
   624
sort constraint specifications in type inference; e.g. "x::_::foo"
wenzelm@12312
   625
ensures that the type of "x" is of sort "foo" (but not necessarily a
wenzelm@12312
   626
type variable);
wenzelm@12280
   627
wenzelm@12280
   628
* Pure/syntax: print modes "type_brackets" and "no_type_brackets"
wenzelm@12280
   629
control output of nested => (types); the default behavior is
wenzelm@12280
   630
"type_brackets";
wenzelm@12280
   631
wenzelm@12280
   632
* Pure/syntax: builtin parse translation for "_constify" turns valued
wenzelm@11817
   633
tokens into AST constants;
wenzelm@11474
   634
wenzelm@12280
   635
* Pure/syntax: prefer later declarations of translations and print
wenzelm@12280
   636
translation functions; potential INCOMPATIBILITY: need to reverse
wenzelm@12280
   637
multiple declarations for same syntax element constant;
wenzelm@12280
   638
wenzelm@12832
   639
* Pure/show_hyps reset by default (in accordance to existing Isar
wenzelm@12832
   640
practice);
wenzelm@12832
   641
wenzelm@12280
   642
* Provers/classical: renamed addaltern to addafter, addSaltern to
wenzelm@12280
   643
addSafter;
wenzelm@12280
   644
wenzelm@12280
   645
* Provers/clasimp: ``iff'' declarations now handle conditional rules
wenzelm@12280
   646
as well;
wenzelm@12253
   647
wenzelm@12538
   648
* system: tested support for MacOS X; should be able to get Isabelle +
wenzelm@12538
   649
Proof General to work in a plain Terminal after installing Poly/ML
wenzelm@12538
   650
(e.g. from the Isabelle distribution area) and GNU bash alone
wenzelm@12538
   651
(e.g. from http://www.apple.com); full X11, XEmacs and X-Symbol
wenzelm@12538
   652
support requires further installations, e.g. from
wenzelm@12538
   653
http://fink.sourceforge.net/);
wenzelm@12538
   654
wenzelm@12280
   655
* system: support Poly/ML 4.1.1 (able to manage larger heaps);
wenzelm@11551
   656
wenzelm@12753
   657
* system: reduced base memory usage by Poly/ML (approx. 20 MB instead
wenzelm@12753
   658
of 40 MB), cf. ML_OPTIONS;
wenzelm@12753
   659
wenzelm@11633
   660
* system: Proof General keywords specification is now part of the
wenzelm@11633
   661
Isabelle distribution (see etc/isar-keywords.el);
wenzelm@11633
   662
wenzelm@12728
   663
* system: support for persistent Proof General sessions (refrain from
wenzelm@12728
   664
outdating all loaded theories on startup); user may create writable
wenzelm@12728
   665
logic images like this: ``isabelle -q HOL Test'';
wenzelm@12597
   666
wenzelm@11551
   667
* system: smart selection of Isabelle process versus Isabelle
wenzelm@11572
   668
interface, accommodates case-insensitive file systems (e.g. HFS+); may
wenzelm@11572
   669
run both "isabelle" and "Isabelle" even if file names are badly
wenzelm@11572
   670
damaged (executable inspects the case of the first letter of its own
wenzelm@11572
   671
name); added separate "isabelle-process" and "isabelle-interface";
wenzelm@11551
   672
wenzelm@12472
   673
* system: refrain from any attempt at filtering input streams; no
wenzelm@12472
   674
longer support ``8bit'' encoding of old isabelle font, instead proper
wenzelm@12472
   675
iso-latin characters may now be used; the related isatools
wenzelm@12472
   676
"symbolinput" and "nonascii" have disappeared as well;
wenzelm@12472
   677
wenzelm@12472
   678
* system: removed old "xterm" interface (the print modes "xterm" and
wenzelm@12472
   679
"xterm_color" are still available for direct use in a suitable
wenzelm@12472
   680
terminal);
wenzelm@12472
   681
paulson@11314
   682
oheimb@11169
   683
wenzelm@11062
   684
New in Isabelle99-2 (February 2001)
wenzelm@11062
   685
-----------------------------------
wenzelm@11062
   686
nipkow@10224
   687
*** Overview of INCOMPATIBILITIES ***
nipkow@10224
   688
paulson@11241
   689
* HOL: please note that theories in the Library and elsewhere often use the
paulson@11241
   690
new-style (Isar) format; to refer to their theorems in an ML script you must
wenzelm@12622
   691
bind them to ML identifers by e.g.      val thm_name = thm "thm_name";
paulson@11241
   692
wenzelm@11043
   693
* HOL: inductive package no longer splits induction rule aggressively,
wenzelm@11043
   694
but only as far as specified by the introductions given; the old
oheimb@11130
   695
format may be recovered via ML function complete_split_rule or attribute
wenzelm@11043
   696
'split_rule (complete)';
wenzelm@11043
   697
wenzelm@10998
   698
* HOL: induct renamed to lfp_induct, lfp_Tarski to lfp_unfold,
wenzelm@10998
   699
gfp_Tarski to gfp_unfold;
nipkow@10224
   700
paulson@10288
   701
* HOL: contrapos, contrapos2 renamed to contrapos_nn, contrapos_pp;
paulson@10288
   702
wenzelm@10858
   703
* HOL: infix "dvd" now has priority 50 rather than 70 (because it is a
wenzelm@10858
   704
relation); infix "^^" has been renamed "``"; infix "``" has been
wenzelm@10858
   705
renamed "`"; "univalent" has been renamed "single_valued";
nipkow@10793
   706
wenzelm@10998
   707
* HOL/Real: "rinv" and "hrinv" replaced by overloaded "inverse"
wenzelm@10998
   708
operation;
wenzelm@10998
   709
nipkow@10868
   710
* HOLCF: infix "`" has been renamed "$"; the symbol syntax is \<cdot>;
nipkow@10856
   711
wenzelm@10391
   712
* Isar: 'obtain' no longer declares "that" fact as simp/intro;
wenzelm@10391
   713
wenzelm@10401
   714
* Isar/HOL: method 'induct' now handles non-atomic goals; as a
wenzelm@10401
   715
consequence, it is no longer monotonic wrt. the local goal context
wenzelm@10401
   716
(which is now passed through the inductive cases);
wenzelm@10401
   717
wenzelm@10976
   718
* Document preparation: renamed standard symbols \<ll> to \<lless> and
wenzelm@10976
   719
\<gg> to \<ggreater>;
wenzelm@10976
   720
nipkow@10224
   721
wenzelm@10245
   722
*** Document preparation ***
wenzelm@10245
   723
wenzelm@10858
   724
* \isabellestyle{NAME} selects version of Isabelle output (currently
wenzelm@10858
   725
available: are "it" for near math-mode best-style output, "sl" for
wenzelm@10858
   726
slanted text style, and "tt" for plain type-writer; if no
wenzelm@10858
   727
\isabellestyle command is given, output is according to slanted
wenzelm@10858
   728
type-writer);
wenzelm@10858
   729
wenzelm@10322
   730
* support sub/super scripts (for single symbols only), input syntax is
wenzelm@10322
   731
like this: "A\<^sup>*" or "A\<^sup>\<star>";
wenzelm@10322
   732
wenzelm@10858
   733
* some more standard symbols; see Appendix A of the system manual for
wenzelm@11062
   734
the complete list of symbols defined in isabellesym.sty;
wenzelm@10858
   735
wenzelm@10998
   736
* improved isabelle style files; more abstract symbol implementation
wenzelm@10998
   737
(should now use \isamath{...} and \isatext{...} in custom symbol
wenzelm@10998
   738
definitions);
wenzelm@10998
   739
wenzelm@10634
   740
* antiquotation @{goals} and @{subgoals} for output of *dynamic* goals
wenzelm@10634
   741
state; Note that presentation of goal states does not conform to
wenzelm@10634
   742
actual human-readable proof documents.  Please do not include goal
wenzelm@10634
   743
states into document output unless you really know what you are doing!
wenzelm@10322
   744
wenzelm@11062
   745
* proper indentation of antiquoted output with proportional LaTeX
wenzelm@11062
   746
fonts;
wenzelm@10862
   747
wenzelm@11050
   748
* no_document ML operator temporarily disables LaTeX document
wenzelm@11050
   749
generation;
wenzelm@11050
   750
wenzelm@11062
   751
* isatool unsymbolize tunes sources for plain ASCII communication;
wenzelm@11062
   752
wenzelm@10322
   753
wenzelm@10306
   754
*** Isar ***
wenzelm@10306
   755
wenzelm@10547
   756
* Pure: Isar now suffers initial goal statements to contain unbound
wenzelm@10547
   757
schematic variables (this does not conform to actual readable proof
wenzelm@10547
   758
documents, due to unpredictable outcome and non-compositional proof
wenzelm@10547
   759
checking); users who know what they are doing may use schematic goals
wenzelm@10547
   760
for Prolog-style synthesis of proven results;
wenzelm@10547
   761
wenzelm@10391
   762
* Pure: assumption method (an implicit finishing) now handles actual
wenzelm@10391
   763
rules as well;
wenzelm@10391
   764
wenzelm@10391
   765
* Pure: improved 'obtain' --- moved to Pure, insert "that" into
wenzelm@10391
   766
initial goal, declare "that" only as Pure intro (only for single
wenzelm@10391
   767
steps); the "that" rule assumption may now be involved in implicit
wenzelm@10391
   768
finishing, thus ".." becomes a feasible for trivial obtains;
wenzelm@10391
   769
wenzelm@10391
   770
* Pure: default proof step now includes 'intro_classes'; thus trivial
wenzelm@10391
   771
instance proofs may be performed by "..";
wenzelm@10391
   772
wenzelm@10391
   773
* Pure: ?thesis / ?this / "..." now work for pure meta-level
wenzelm@10391
   774
statements as well;
wenzelm@10306
   775
wenzelm@11097
   776
* Pure: more robust selection of calculational rules;
wenzelm@11097
   777
wenzelm@10858
   778
* Pure: the builtin notion of 'finished' goal now includes the ==-refl
wenzelm@10858
   779
rule (as well as the assumption rule);
wenzelm@10858
   780
wenzelm@10858
   781
* Pure: 'thm_deps' command visualizes dependencies of theorems and
wenzelm@10858
   782
lemmas, using the graph browser tool;
wenzelm@10858
   783
wenzelm@10944
   784
* Pure: predict failure of "show" in interactive mode;
wenzelm@10944
   785
wenzelm@11016
   786
* Pure: 'thms_containing' now takes actual terms as arguments;
wenzelm@11016
   787
wenzelm@10401
   788
* HOL: improved method 'induct' --- now handles non-atomic goals
wenzelm@10401
   789
(potential INCOMPATIBILITY); tuned error handling;
wenzelm@10401
   790
wenzelm@10557
   791
* HOL: cases and induct rules now provide explicit hints about the
wenzelm@10547
   792
number of facts to be consumed (0 for "type" and 1 for "set" rules);
wenzelm@10547
   793
any remaining facts are inserted into the goal verbatim;
wenzelm@10547
   794
wenzelm@10858
   795
* HOL: local contexts (aka cases) may now contain term bindings as
wenzelm@10858
   796
well; the 'cases' and 'induct' methods new provide a ?case binding for
wenzelm@10858
   797
the result to be shown in each case;
wenzelm@10858
   798
wenzelm@10770
   799
* HOL: added 'recdef_tc' command;
wenzelm@10770
   800
wenzelm@11016
   801
* isatool convert assists in eliminating legacy ML scripts;
wenzelm@11016
   802
wenzelm@10306
   803
wenzelm@10245
   804
*** HOL ***
wenzelm@10245
   805
wenzelm@10245
   806
* HOL/Library: a collection of generic theories to be used together
wenzelm@10245
   807
with main HOL; the theory loader path already includes this directory
wenzelm@10245
   808
by default; the following existing theories have been moved here:
wenzelm@10245
   809
HOL/Induct/Multiset, HOL/Induct/Acc (as Accessible_Part), HOL/While
wenzelm@10337
   810
(as While_Combinator), HOL/Lex/Prefix (as List_Prefix);
wenzelm@10245
   811
wenzelm@10966
   812
* HOL/Unix: "Some aspects of Unix file-system security", a typical
wenzelm@10966
   813
modelling and verification task performed in Isabelle/HOL +
wenzelm@10966
   814
Isabelle/Isar + Isabelle document preparation (by Markus Wenzel).
wenzelm@10966
   815
wenzelm@11094
   816
* HOL/Algebra: special summation operator SUM no longer exists, it has
wenzelm@11094
   817
been replaced by setsum; infix 'assoc' now has priority 50 (like
wenzelm@11094
   818
'dvd'); axiom 'one_not_zero' has been moved from axclass 'ring' to
wenzelm@11094
   819
'domain', this makes the theory consistent with mathematical
wenzelm@11094
   820
literature;
wenzelm@11094
   821
wenzelm@10514
   822
* HOL basics: added overloaded operations "inverse" and "divide"
wenzelm@10726
   823
(infix "/"), syntax for generic "abs" operation, generic summation
wenzelm@11094
   824
operator \<Sum>;
wenzelm@10452
   825
wenzelm@10391
   826
* HOL/typedef: simplified package, provide more useful rules (see also
wenzelm@10391
   827
HOL/subset.thy);
wenzelm@10391
   828
wenzelm@10915
   829
* HOL/datatype: induction rule for arbitrarily branching datatypes is
wenzelm@10915
   830
now expressed as a proper nested rule (old-style tactic scripts may
wenzelm@10915
   831
require atomize_strip_tac to cope with non-atomic premises);
wenzelm@10915
   832
wenzelm@10915
   833
* HOL: renamed theory "Prod" to "Product_Type", renamed "split" rule
wenzelm@10915
   834
to "split_conv" (old name still available for compatibility);
wenzelm@10915
   835
wenzelm@10915
   836
* HOL: improved concrete syntax for strings (e.g. allows translation
wenzelm@10915
   837
rules with string literals);
wenzelm@10915
   838
paulson@12245
   839
* HOL-Real-Hyperreal: this extends HOL-Real with the hyperreals
paulson@12245
   840
 and Fleuriot's mechanization of analysis, including the transcendental
paulson@12245
   841
 functions for the reals;
paulson@10756
   842
wenzelm@11094
   843
* HOL/Real, HOL/Hyperreal: improved arithmetic simplification;
wenzelm@10391
   844
wenzelm@10858
   845
paulson@10474
   846
*** CTT ***
paulson@10474
   847
wenzelm@10547
   848
* CTT: x-symbol support for Pi, Sigma, -->, : (membership); note that
wenzelm@10547
   849
"lam" is displayed as TWO lambda-symbols
paulson@10474
   850
wenzelm@10547
   851
* CTT: theory Main now available, containing everything (that is, Bool
wenzelm@10547
   852
and Arith);
wenzelm@10547
   853
paulson@10474
   854
wenzelm@10391
   855
*** General ***
wenzelm@10391
   856
wenzelm@10547
   857
* Pure: the Simplifier has been implemented properly as a derived rule
wenzelm@10547
   858
outside of the actual kernel (at last!); the overall performance
wenzelm@10547
   859
penalty in practical applications is about 50%, while reliability of
wenzelm@10547
   860
the Isabelle inference kernel has been greatly improved;
wenzelm@10547
   861
wenzelm@11112
   862
* print modes "brackets" and "no_brackets" control output of nested =>
wenzelm@11112
   863
(types) and ==> (props); the default behaviour is "brackets";
wenzelm@11112
   864
wenzelm@10391
   865
* Provers: fast_tac (and friends) now handle actual object-logic rules
wenzelm@10391
   866
as assumptions as well;
wenzelm@10391
   867
wenzelm@11124
   868
* system: support Poly/ML 4.0;
wenzelm@11124
   869
wenzelm@11124
   870
* system: isatool install handles KDE version 1 or 2;
wenzelm@11124
   871
wenzelm@10391
   872
wenzelm@10245
   873
wenzelm@10103
   874
New in Isabelle99-1 (October 2000)
wenzelm@10103
   875
----------------------------------
wenzelm@8015
   876
wenzelm@10003
   877
*** Overview of INCOMPATIBILITIES ***
paulson@8014
   878
wenzelm@8848
   879
* HOL: simplification of natural numbers is much changed; to partly
wenzelm@8848
   880
recover the old behaviour (e.g. to prevent n+n rewriting to #2*n)
wenzelm@8848
   881
issue the following ML commands:
wenzelm@8848
   882
wenzelm@8848
   883
  Delsimprocs Nat_Numeral_Simprocs.cancel_numerals;
wenzelm@8848
   884
  Delsimprocs [Nat_Numeral_Simprocs.combine_numerals];
paulson@8788
   885
wenzelm@10129
   886
* HOL: simplification no longer dives into case-expressions; this is
wenzelm@10129
   887
controlled by "t.weak_case_cong" for each datatype t;
wenzelm@10003
   888
wenzelm@10003
   889
* HOL: nat_less_induct renamed to less_induct;
wenzelm@10003
   890
wenzelm@10003
   891
* HOL: systematic renaming of the SOME (Eps) rules, may use isatool
wenzelm@10003
   892
fixsome to patch .thy and .ML sources automatically;
paulson@8967
   893
wenzelm@10003
   894
  select_equality  -> some_equality
wenzelm@10003
   895
  select_eq_Ex     -> some_eq_ex
wenzelm@10003
   896
  selectI2EX       -> someI2_ex
wenzelm@10003
   897
  selectI2         -> someI2
wenzelm@10003
   898
  selectI          -> someI
wenzelm@10003
   899
  select1_equality -> some1_equality
wenzelm@10003
   900
  Eps_sym_eq       -> some_sym_eq_trivial
wenzelm@10003
   901
  Eps_eq           -> some_eq_trivial
wenzelm@10003
   902
wenzelm@10003
   903
* HOL: exhaust_tac on datatypes superceded by new generic case_tac;
wenzelm@10003
   904
wenzelm@10003
   905
* HOL: removed obsolete theorem binding expand_if (refer to split_if
wenzelm@10003
   906
instead);
wenzelm@10003
   907
wenzelm@10003
   908
* HOL: the recursion equations generated by 'recdef' are now called
wenzelm@10003
   909
f.simps instead of f.rules;
wenzelm@10003
   910
wenzelm@10003
   911
* HOL: qed_spec_mp now also handles bounded ALL as well;
wenzelm@10003
   912
wenzelm@10003
   913
* HOL: 0 is now overloaded, so the type constraint ":: nat" may
wenzelm@10003
   914
sometimes be needed;
wenzelm@10003
   915
wenzelm@10003
   916
* HOL: the constant for "f``x" is now "image" rather than "op ``";
paulson@8014
   917
paulson@10065
   918
* HOL: the constant for "f-``x" is now "vimage" rather than "op -``";
paulson@10065
   919
wenzelm@9330
   920
* HOL: the disjoint sum is now "<+>" instead of "Plus"; the cartesian
wenzelm@9330
   921
product is now "<*>" instead of "Times"; the lexicographic product is
wenzelm@9330
   922
now "<*lex*>" instead of "**";
nipkow@8705
   923
wenzelm@10003
   924
* HOL: theory Sexp is now in HOL/Induct examples (it used to be part
wenzelm@10003
   925
of main HOL, but was unused); better use HOL's datatype package;
paulson@9971
   926
wenzelm@10137
   927
* HOL: removed "symbols" syntax for constant "override" of theory Map;
wenzelm@10137
   928
the old syntax may be recovered as follows:
wenzelm@10137
   929
wenzelm@10137
   930
  syntax (symbols)
wenzelm@10137
   931
    override  :: "('a ~=> 'b) => ('a ~=> 'b) => ('a ~=> 'b)"
wenzelm@10137
   932
      (infixl "\\<oplus>" 100)
wenzelm@10137
   933
wenzelm@8848
   934
* HOL/Real: "rabs" replaced by overloaded "abs" function;
wenzelm@8848
   935
wenzelm@8887
   936
* HOL/ML: even fewer consts are declared as global (see theories Ord,
wenzelm@8887
   937
Lfp, Gfp, WF); this only affects ML packages that refer to const names
wenzelm@8887
   938
internally;
wenzelm@8887
   939
wenzelm@10003
   940
* HOL and ZF: syntax for quotienting wrt an equivalence relation
wenzelm@10003
   941
changed from A/r to A//r;
wenzelm@9908
   942
wenzelm@10003
   943
* ZF: new treatment of arithmetic (nat & int) may break some old
wenzelm@10003
   944
proofs;
wenzelm@8921
   945
wenzelm@10003
   946
* Isar: renamed some attributes (RS -> THEN, simplify -> simplified,
wenzelm@10003
   947
rulify -> rule_format, elimify -> elim_format, ...);
paulson@9542
   948
wenzelm@9941
   949
* Isar/Provers: intro/elim/dest attributes changed; renamed
wenzelm@9941
   950
intro/intro!/intro!! flags to intro!/intro/intro? (in most cases, one
wenzelm@9937
   951
should have to change intro!! to intro? only); replaced "delrule" by
wenzelm@9937
   952
"rule del";
wenzelm@9437
   953
wenzelm@9612
   954
* Isar/HOL: renamed "intrs" to "intros" in inductive definitions;
wenzelm@9612
   955
wenzelm@9437
   956
* Provers: strengthened force_tac by using new first_best_tac;
oheimb@9402
   957
wenzelm@10003
   958
* LaTeX document preparation: several changes of isabelle.sty (see
wenzelm@10003
   959
lib/texinputs);
wenzelm@8729
   960
paulson@8014
   961
wenzelm@8487
   962
*** Document preparation ***
wenzelm@8358
   963
wenzelm@9198
   964
* formal comments (text blocks etc.) in new-style theories may now
wenzelm@9753
   965
contain antiquotations of thm/prop/term/typ/text to be presented
wenzelm@9753
   966
according to latex print mode; concrete syntax is like this:
wenzelm@9753
   967
@{term[show_types] "f(x) = a + x"};
wenzelm@9198
   968
wenzelm@8358
   969
* isatool mkdir provides easy setup of Isabelle session directories,
wenzelm@8518
   970
including proper document sources;
wenzelm@8358
   971
wenzelm@8358
   972
* generated LaTeX sources are now deleted after successful run
wenzelm@8358
   973
(isatool document -c); may retain a copy somewhere else via -D option
wenzelm@8358
   974
of isatool usedir;
wenzelm@8358
   975
wenzelm@8566
   976
* isatool usedir -D now lets isatool latex -o sty update the Isabelle
wenzelm@10003
   977
style files, achieving self-contained LaTeX sources and simplifying
wenzelm@10003
   978
LaTeX debugging;
wenzelm@8566
   979
wenzelm@8518
   980
* old-style theories now produce (crude) LaTeX output as well;
wenzelm@8358
   981
wenzelm@9057
   982
* browser info session directories are now self-contained (may be put
wenzelm@9437
   983
on WWW server seperately); improved graphs of nested sessions; removed
wenzelm@9437
   984
graph for 'all sessions';
wenzelm@9057
   985
wenzelm@10003
   986
* several improvements in isabelle style files; \isabellestyle{it}
wenzelm@10003
   987
produces fake math mode output; \isamarkupheader is now \section by
wenzelm@10003
   988
default; see lib/texinputs/isabelle.sty etc.;
wenzelm@9489
   989
wenzelm@8358
   990
wenzelm@8184
   991
*** Isar ***
wenzelm@8184
   992
wenzelm@10003
   993
* Isar/Pure: local results and corresponding term bindings are now
wenzelm@10003
   994
subject to Hindley-Milner polymorphism (similar to ML); this
wenzelm@10003
   995
accommodates incremental type-inference very nicely;
wenzelm@8283
   996
wenzelm@10003
   997
* Isar/Pure: new derived language element 'obtain' supports
wenzelm@10003
   998
generalized existence reasoning;
wenzelm@8621
   999
wenzelm@10003
  1000
* Isar/Pure: new calculational elements 'moreover' and 'ultimately'
wenzelm@10003
  1001
support accumulation of results, without applying any rules yet;
wenzelm@10003
  1002
useful to collect intermediate results without explicit name
wenzelm@10003
  1003
references, and for use with transitivity rules with more than 2
wenzelm@10003
  1004
premises;
wenzelm@8184
  1005
wenzelm@10003
  1006
* Isar/Pure: scalable support for case-analysis type proofs: new
wenzelm@10003
  1007
'case' language element refers to local contexts symbolically, as
wenzelm@10003
  1008
produced by certain proof methods; internally, case names are attached
wenzelm@10003
  1009
to theorems as "tags";
wenzelm@8440
  1010
wenzelm@10003
  1011
* Isar/Pure: theory command 'hide' removes declarations from
wenzelm@9330
  1012
class/type/const name spaces;
wenzelm@9330
  1013
wenzelm@10003
  1014
* Isar/Pure: theory command 'defs' supports option "(overloaded)" to
wenzelm@9330
  1015
indicate potential overloading;
wenzelm@9330
  1016
wenzelm@10003
  1017
* Isar/Pure: changed syntax of local blocks from {{ }} to { };
wenzelm@8621
  1018
wenzelm@10003
  1019
* Isar/Pure: syntax of sorts made 'inner', i.e. have to write
wenzelm@10003
  1020
"{a,b,c}" instead of {a,b,c};
wenzelm@9011
  1021
wenzelm@10003
  1022
* Isar/Pure now provides its own version of intro/elim/dest
wenzelm@10003
  1023
attributes; useful for building new logics, but beware of confusion
wenzelm@10003
  1024
with the version in Provers/classical;
wenzelm@9612
  1025
wenzelm@10003
  1026
* Isar/Pure: the local context of (non-atomic) goals is provided via
wenzelm@10003
  1027
case name 'antecedent';
wenzelm@8440
  1028
wenzelm@10003
  1029
* Isar/Pure: removed obsolete 'transfer' attribute (transfer of thms
wenzelm@10003
  1030
to the current context is now done automatically);
wenzelm@9383
  1031
wenzelm@10003
  1032
* Isar/Pure: theory command 'method_setup' provides a simple interface
wenzelm@10003
  1033
for definining proof methods in ML;
wenzelm@9612
  1034
wenzelm@10003
  1035
* Isar/Provers: intro/elim/dest attributes changed; renamed
wenzelm@9941
  1036
intro/intro!/intro!! flags to intro!/intro/intro? (INCOMPATIBILITY, in
wenzelm@9941
  1037
most cases, one should have to change intro!! to intro? only);
wenzelm@9941
  1038
replaced "delrule" by "rule del";
wenzelm@8283
  1039
wenzelm@10003
  1040
* Isar/Provers: new 'hypsubst' method, plain 'subst' method and
wenzelm@10003
  1041
'symmetric' attribute (the latter supercedes [RS sym]);
wenzelm@10003
  1042
wenzelm@10003
  1043
* Isar/Provers: splitter support (via 'split' attribute and 'simp'
wenzelm@10003
  1044
method modifier); 'simp' method: 'only:' modifier removes loopers as
wenzelm@10003
  1045
well (including splits);
wenzelm@10003
  1046
wenzelm@10003
  1047
* Isar/Provers: Simplifier and Classical methods now support all kind
wenzelm@10003
  1048
of modifiers used in the past, including 'cong', 'iff', etc.
wenzelm@10003
  1049
wenzelm@10003
  1050
* Isar/Provers: added 'fastsimp' and 'clarsimp' methods (combination
wenzelm@10003
  1051
of Simplifier and Classical reasoner);
wenzelm@10003
  1052
wenzelm@10003
  1053
* Isar/HOL: new proof method 'cases' and improved version of 'induct'
wenzelm@10003
  1054
now support named cases; major packages (inductive, datatype, primrec,
wenzelm@10003
  1055
recdef) support case names and properly name parameters;
wenzelm@9612
  1056
wenzelm@10003
  1057
* Isar/HOL: new transitivity rules for substitution in inequalities --
wenzelm@10003
  1058
monotonicity conditions are extracted to be proven at end of
wenzelm@10003
  1059
calculations;
wenzelm@10003
  1060
wenzelm@10003
  1061
* Isar/HOL: removed 'case_split' thm binding, should use 'cases' proof
wenzelm@10003
  1062
method anyway;
wenzelm@10003
  1063
wenzelm@10003
  1064
* Isar/HOL: removed old expand_if = split_if; theorems if_splits =
wenzelm@10003
  1065
split_if split_if_asm; datatype package provides theorems foo.splits =
wenzelm@10003
  1066
foo.split foo.split_asm for each datatype;
wenzelm@10003
  1067
wenzelm@10003
  1068
* Isar/HOL: tuned inductive package, rename "intrs" to "intros"
wenzelm@10003
  1069
(potential INCOMPATIBILITY), emulation of mk_cases feature for proof
wenzelm@10003
  1070
scripts: new 'inductive_cases' command and 'ind_cases' method; (Note:
wenzelm@10003
  1071
use "(cases (simplified))" method in proper proof texts);
wenzelm@10003
  1072
wenzelm@10003
  1073
* Isar/HOL: added global 'arith_split' attribute for 'arith' method;
wenzelm@10003
  1074
wenzelm@10003
  1075
* Isar: names of theorems etc. may be natural numbers as well;
wenzelm@10003
  1076
wenzelm@10003
  1077
* Isar: 'pr' command: optional arguments for goals_limit and
wenzelm@9724
  1078
ProofContext.prems_limit; no longer prints theory contexts, but only
wenzelm@9724
  1079
proof states;
wenzelm@8487
  1080
wenzelm@10003
  1081
* Isar: diagnostic commands 'pr', 'thm', 'prop', 'term', 'typ' admit
wenzelm@8518
  1082
additional print modes to be specified; e.g. "pr(latex)" will print
wenzelm@8518
  1083
proof state according to the Isabelle LaTeX style;
wenzelm@8487
  1084
wenzelm@10003
  1085
* Isar: improved support for emulating tactic scripts, including proof
wenzelm@9612
  1086
methods 'rule_tac' etc., 'cut_tac', 'thin_tac', 'subgoal_tac',
wenzelm@9612
  1087
'rename_tac', 'rotate_tac', 'tactic', and 'case_tac' / 'induct_tac'
wenzelm@9612
  1088
(for HOL datatypes);
wenzelm@8534
  1089
wenzelm@10003
  1090
* Isar: simplified (more robust) goal selection of proof methods: 1st
wenzelm@10003
  1091
goal, all goals, or explicit goal specifier (tactic emulation); thus
wenzelm@10003
  1092
'proof method scripts' have to be in depth-first order;
wenzelm@8673
  1093
wenzelm@10003
  1094
* Isar: tuned 'let' syntax: replaced 'as' keyword by 'and';
wenzelm@8729
  1095
wenzelm@10003
  1096
* Isar: removed 'help' command, which hasn't been too helpful anyway;
wenzelm@10003
  1097
should instead use individual commands for printing items
wenzelm@10003
  1098
(print_commands, print_methods etc.);
wenzelm@9224
  1099
wenzelm@10003
  1100
* Isar: added 'nothing' --- the empty list of theorems;
wenzelm@9239
  1101
wenzelm@8184
  1102
paulson@8014
  1103
*** HOL ***
paulson@8014
  1104
wenzelm@10080
  1105
* HOL/MicroJava: formalization of a fragment of Java, together with a
wenzelm@10080
  1106
corresponding virtual machine and a specification of its bytecode
wenzelm@10080
  1107
verifier and a lightweight bytecode verifier, including proofs of
wenzelm@10080
  1108
type-safety; by Gerwin Klein, Tobias Nipkow, David von Oheimb, and
wenzelm@10080
  1109
Cornelia Pusch (see also the homepage of project Bali at
wenzelm@10080
  1110
http://isabelle.in.tum.de/Bali/);
wenzelm@10080
  1111
wenzelm@8518
  1112
* HOL/Algebra: new theory of rings and univariate polynomials, by
wenzelm@8518
  1113
Clemens Ballarin;
paulson@8014
  1114
wenzelm@10157
  1115
* HOL/NumberTheory: fundamental Theorem of Arithmetic, Chinese
wenzelm@10003
  1116
Remainder Theorem, Fermat/Euler Theorem, Wilson's Theorem, by Thomas M
wenzelm@10003
  1117
Rasmussen;
wenzelm@8570
  1118
wenzelm@10157
  1119
* HOL/Lattice: fundamental concepts of lattice theory and order
wenzelm@10157
  1120
structures, including duals, properties of bounds versus algebraic
wenzelm@10157
  1121
laws, lattice operations versus set-theoretic ones, the Knaster-Tarski
wenzelm@10157
  1122
Theorem for complete lattices etc.; may also serve as a demonstration
wenzelm@10157
  1123
for abstract algebraic reasoning using axiomatic type classes, and
wenzelm@10157
  1124
mathematics-style proof in Isabelle/Isar; by Markus Wenzel;
wenzelm@10157
  1125
wenzelm@10003
  1126
* HOL/Prolog: a (bare-bones) implementation of Lambda-Prolog, by David
wenzelm@10003
  1127
von Oheimb;
paulson@9542
  1128
wenzelm@10164
  1129
* HOL/IMPP: extension of IMP with local variables and mutually
wenzelm@10164
  1130
recursive procedures, by David von Oheimb;
wenzelm@10164
  1131
wenzelm@10003
  1132
* HOL/Lambda: converted into new-style theory and document;
paulson@9542
  1133
wenzelm@10003
  1134
* HOL/ex/Multiquote: example of multiple nested quotations and
wenzelm@10003
  1135
anti-quotations -- basically a generalized version of de-Bruijn
wenzelm@10003
  1136
representation; very useful in avoiding lifting of operations;
wenzelm@8848
  1137
wenzelm@9612
  1138
* HOL/record: added general record equality rule to simpset; fixed
wenzelm@9612
  1139
select-update simplification procedure to handle extended records as
wenzelm@9612
  1140
well; admit "r" as field name;
paulson@9542
  1141
paulson@8967
  1142
* HOL: 0 is now overloaded over the new sort "zero", allowing its use with
paulson@8967
  1143
other numeric types and also as the identity of groups, rings, etc.;
paulson@8967
  1144
paulson@8967
  1145
* HOL: new axclass plus_ac0 for addition with the AC-laws and 0 as identity.
paulson@8967
  1146
Types nat and int belong to this axclass;
paulson@8967
  1147
wenzelm@10003
  1148
* HOL: greatly improved simplification involving numerals of type nat, int, real:
paulson@8788
  1149
   (i + #8 + j) = Suc k simplifies to  #7 + (i + j) = k
paulson@8832
  1150
   i*j + k + j*#3*i     simplifies to  #4*(i*j) + k
paulson@8832
  1151
  two terms #m*u and #n*u are replaced by #(m+n)*u
paulson@8832
  1152
    (where #m, #n and u can implicitly be 1; this is simproc combine_numerals)
paulson@8832
  1153
  and the term/formula #m*u+x ~~ #n*u+y simplifies simplifies to #(m-n)+x ~~ y
paulson@8832
  1154
    or x ~~ #(n-m)+y, where ~~ is one of = < <= or - (simproc cancel_numerals);
paulson@8736
  1155
wenzelm@10003
  1156
* HOL: meson_tac is available (previously in ex/meson.ML); it is a
wenzelm@10003
  1157
powerful prover for predicate logic but knows nothing of clasets; see
wenzelm@10003
  1158
ex/mesontest.ML and ex/mesontest2.ML for example applications;
paulson@9835
  1159
wenzelm@8848
  1160
* HOL: new version of "case_tac" subsumes both boolean case split and
wenzelm@8440
  1161
"exhaust_tac" on datatypes; INCOMPATIBILITY: exhaust_tac no longer
wenzelm@8518
  1162
exists, may define val exhaust_tac = case_tac for ad-hoc portability;
wenzelm@8440
  1163
wenzelm@8848
  1164
* HOL: simplification no longer dives into case-expressions: only the
wenzelm@10129
  1165
selector expression is simplified, but not the remaining arms; to
wenzelm@10129
  1166
enable full simplification of case-expressions for datatype t, you may
wenzelm@10129
  1167
remove t.weak_case_cong from the simpset, either globally (Delcongs
wenzelm@10129
  1168
[thm"t.weak_case_cong"];) or locally (delcongs [...]).
nipkow@8603
  1169
wenzelm@8848
  1170
* HOL/recdef: the recursion equations generated by 'recdef' for
wenzelm@8848
  1171
function 'f' are now called f.simps instead of f.rules; if all
wenzelm@8848
  1172
termination conditions are proved automatically, these simplification
wenzelm@8848
  1173
rules are added to the simpset, as in primrec; rules may be named
wenzelm@8848
  1174
individually as well, resulting in a separate list of theorems for
wenzelm@8848
  1175
each equation;
wenzelm@8848
  1176
wenzelm@9489
  1177
* HOL/While is a new theory that provides a while-combinator. It
wenzelm@9489
  1178
permits the definition of tail-recursive functions without the
wenzelm@9489
  1179
provision of a termination measure. The latter is necessary once the
wenzelm@9489
  1180
invariant proof rule for while is applied.
nipkow@9457
  1181
wenzelm@10003
  1182
* HOL: new (overloaded) notation for the set of elements below/above
wenzelm@10003
  1183
some element: {..u}, {..u(}, {l..}, {)l..}. See theory SetInterval.
nipkow@8925
  1184
wenzelm@8848
  1185
* HOL: theorems impI, allI, ballI bound as "strip";
wenzelm@8848
  1186
wenzelm@10003
  1187
* HOL: new tactic induct_thm_tac: thm -> string -> int -> tactic
nipkow@9746
  1188
induct_tac th "x1 ... xn" expects th to have a conclusion of the form
nipkow@9746
  1189
P v1 ... vn and abbreviates res_inst_tac [("v1","x1"),...,("vn","xn")] th;
nipkow@9746
  1190
wenzelm@10003
  1191
* HOL/Real: "rabs" replaced by overloaded "abs" function;
nipkow@9737
  1192
wenzelm@10003
  1193
* HOL: theory Sexp now in HOL/Induct examples (it used to be part of
wenzelm@10003
  1194
main HOL, but was unused);
nipkow@8626
  1195
wenzelm@10003
  1196
* HOL: fewer consts declared as global (e.g. have to refer to
wenzelm@10003
  1197
"Lfp.lfp" instead of "lfp" internally; affects ML packages only);
wenzelm@8887
  1198
wenzelm@10003
  1199
* HOL: tuned AST representation of nested pairs, avoiding bogus output
wenzelm@10003
  1200
in case of overlap with user translations (e.g. judgements over
wenzelm@10003
  1201
tuples); (note that the underlying logical represenation is still
wenzelm@10003
  1202
bogus);
wenzelm@9349
  1203
nipkow@8412
  1204
paulson@9542
  1205
*** ZF ***
paulson@9542
  1206
wenzelm@10003
  1207
* ZF: simplification automatically cancels common terms in arithmetic
wenzelm@10003
  1208
expressions over nat and int;
paulson@9542
  1209
wenzelm@10003
  1210
* ZF: new treatment of nat to minimize type-checking: all operators
wenzelm@10003
  1211
coerce their operands to a natural number using the function natify,
wenzelm@10003
  1212
making the algebraic laws unconditional;
paulson@9542
  1213
wenzelm@10003
  1214
* ZF: as above, for int: operators coerce their operands to an integer
wenzelm@10003
  1215
using the function intify;
paulson@9542
  1216
wenzelm@10003
  1217
* ZF: the integer library now contains many of the usual laws for the
wenzelm@10003
  1218
orderings, including $<=, and monotonicity laws for $+ and $*;
paulson@9542
  1219
wenzelm@10003
  1220
* ZF: new example ZF/ex/NatSum to demonstrate integer arithmetic
wenzelm@10003
  1221
simplification;
paulson@9388
  1222
wenzelm@10003
  1223
* FOL and ZF: AddIffs now available, giving theorems of the form P<->Q
wenzelm@10003
  1224
to the simplifier and classical reasoner simultaneously;
paulson@9388
  1225
paulson@9388
  1226
wenzelm@8358
  1227
*** General ***
wenzelm@8358
  1228
wenzelm@10003
  1229
* Provers: blast_tac now handles actual object-logic rules as
wenzelm@10003
  1230
assumptions; note that auto_tac uses blast_tac internally as well;
wenzelm@10003
  1231
wenzelm@10003
  1232
* Provers: new functions rulify/rulify_no_asm: thm -> thm for turning
wenzelm@10003
  1233
outer -->/All/Ball into ==>/!!; qed_spec_mp now uses rulify_no_asm;
wenzelm@10003
  1234
wenzelm@9941
  1235
* Provers: delrules now handles destruct rules as well (no longer need
wenzelm@9941
  1236
explicit make_elim);
wenzelm@9941
  1237
wenzelm@10003
  1238
* Provers: Blast_tac now warns of and ignores "weak elimination rules" e.g.
wenzelm@10003
  1239
  [| inj ?f;          ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
wenzelm@10003
  1240
use instead the strong form,
wenzelm@10003
  1241
  [| inj ?f; ~ ?W ==> ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
wenzelm@10003
  1242
in HOL, FOL and ZF the function cla_make_elim will create such rules
wenzelm@10003
  1243
from destruct-rules;
wenzelm@9489
  1244
wenzelm@9709
  1245
* Provers: Simplifier.easy_setup provides a fast path to basic
wenzelm@9709
  1246
Simplifier setup for new object-logics;
wenzelm@9709
  1247
wenzelm@9709
  1248
* Pure: AST translation rules no longer require constant head on LHS;
wenzelm@9349
  1249
wenzelm@9709
  1250
* Pure: improved name spaces: ambiguous output is qualified; support
wenzelm@9709
  1251
for hiding of names;
wenzelm@8729
  1252
wenzelm@10003
  1253
* system: smart setup of canonical ML_HOME, ISABELLE_INTERFACE, and
wenzelm@10003
  1254
XSYMBOL_HOME; no longer need to do manual configuration in most
wenzelm@10003
  1255
situations;
wenzelm@10003
  1256
wenzelm@9709
  1257
* system: compression of ML heaps images may now be controlled via -c
wenzelm@9709
  1258
option of isabelle and isatool usedir (currently only observed by
wenzelm@9709
  1259
Poly/ML);
wenzelm@8358
  1260
wenzelm@9981
  1261
* system: isatool installfonts may handle X-Symbol fonts as well (very
wenzelm@9981
  1262
useful for remote X11);
wenzelm@9981
  1263
wenzelm@9709
  1264
* system: provide TAGS file for Isabelle sources;
wenzelm@9052
  1265
wenzelm@9288
  1266
* ML: infix 'OF' is a version of 'MRS' with more appropriate argument
wenzelm@9288
  1267
order;
wenzelm@9288
  1268
wenzelm@8994
  1269
* ML: renamed flags Syntax.trace_norm_ast to Syntax.trace_ast; global
wenzelm@8994
  1270
timing flag supersedes proof_timing and Toplevel.trace;
wenzelm@8994
  1271
wenzelm@10003
  1272
* ML: new combinators |>> and |>>> for incremental transformations
wenzelm@10003
  1273
with secondary results (e.g. certain theory extensions):
wenzelm@10003
  1274
wenzelm@9330
  1275
* ML: PureThy.add_defs gets additional argument to indicate potential
wenzelm@9330
  1276
overloading (usually false);
wenzelm@9330
  1277
wenzelm@10003
  1278
* ML: PureThy.add_thms/add_axioms/add_defs now return theorems as
wenzelm@10003
  1279
results;
wenzelm@8440
  1280
wenzelm@8358
  1281
wenzelm@8015
  1282
wenzelm@7986
  1283
New in Isabelle99 (October 1999)
wenzelm@7986
  1284
--------------------------------
oheimb@4649
  1285
paulson@5931
  1286
*** Overview of INCOMPATIBILITIES (see below for more details) ***
paulson@5931
  1287
paulson@6922
  1288
* HOL: The THEN and ELSE parts of conditional expressions (if P then x else y)
paulson@6922
  1289
are no longer simplified.  (This allows the simplifier to unfold recursive
paulson@6922
  1290
functional programs.)  To restore the old behaviour, declare
wenzelm@7215
  1291
wenzelm@7215
  1292
    Delcongs [if_weak_cong];
paulson@6922
  1293
wenzelm@6269
  1294
* HOL: Removed the obsolete syntax "Compl A"; use -A for set
wenzelm@6269
  1295
complement;
paulson@5931
  1296
wenzelm@6269
  1297
* HOL: the predicate "inj" is now defined by translation to "inj_on";
paulson@6174
  1298
berghofe@7847
  1299
* HOL/datatype: mutual_induct_tac no longer exists --
berghofe@7847
  1300
  use induct_tac "x_1 ... x_n" instead of mutual_induct_tac ["x_1", ..., "x_n"]
berghofe@7847
  1301
wenzelm@6386
  1302
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
  1303
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
  1304
wenzelm@6269
  1305
* ZF: The con_defs part of an inductive definition may no longer refer
wenzelm@6269
  1306
to constants declared in the same theory;
nipkow@6057
  1307
wenzelm@6269
  1308
* HOL, ZF: the function mk_cases, generated by the inductive
wenzelm@6269
  1309
definition package, has lost an argument.  To simplify its result, it
wenzelm@6269
  1310
uses the default simpset instead of a supplied list of theorems.
paulson@6141
  1311
wenzelm@7215
  1312
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
  1313
nipkow@7619
  1314
* Simplifier: the type of the infix ML functions
wenzelm@8729
  1315
        setSSolver addSSolver setSolver addSolver
nipkow@7619
  1316
is now  simpset * solver -> simpset  where `solver' is a new abstract type
nipkow@7619
  1317
for packaging solvers. A solver is created via
wenzelm@8729
  1318
        mk_solver: string -> (thm list -> int -> tactic) -> solver
nipkow@7619
  1319
where the string argument is only a comment.
nipkow@6057
  1320
wenzelm@7647
  1321
paulson@6069
  1322
*** Proof tools ***
paulson@6069
  1323
wenzelm@6343
  1324
* Provers/Arith/fast_lin_arith.ML contains a functor for creating a
wenzelm@6343
  1325
decision procedure for linear arithmetic. Currently it is used for
wenzelm@7593
  1326
types `nat', `int', and `real' in HOL (see below); it can, should and
wenzelm@7593
  1327
will be instantiated for other types and logics as well.
paulson@6069
  1328
nipkow@7324
  1329
* The simplifier now accepts rewrite rules with flexible heads, eg
nipkow@7324
  1330
     hom ?f ==> ?f(?x+?y) = ?f ?x + ?f ?y
nipkow@7324
  1331
  They are applied like any rule with a non-pattern lhs, i.e. by first-order
nipkow@7324
  1332
  matching.
paulson@6069
  1333
wenzelm@7593
  1334
paulson@6014
  1335
*** General ***
paulson@6014
  1336
wenzelm@7986
  1337
* New Isabelle/Isar subsystem provides an alternative to traditional
wenzelm@7215
  1338
tactical theorem proving; together with the ProofGeneral/isar user
wenzelm@7215
  1339
interface it offers an interactive environment for developing human
wenzelm@7215
  1340
readable proof documents (Isar == Intelligible semi-automated
wenzelm@7886
  1341
reasoning); for further information see isatool doc isar-ref,
wenzelm@7986
  1342
src/HOL/Isar_examples and http://isabelle.in.tum.de/Isar/
wenzelm@7886
  1343
wenzelm@9612
  1344
* improved and simplified presentation of theories: better HTML markup
wenzelm@9612
  1345
(including colors), graph views in several sizes; isatool usedir now
wenzelm@9612
  1346
provides a proper interface for user theories (via -P option); actual
wenzelm@9612
  1347
document preparation based on (PDF)LaTeX is available as well (for
wenzelm@9612
  1348
new-style theories only); see isatool doc system for more information;
wenzelm@7215
  1349
wenzelm@7252
  1350
* native support for Proof General, both for classic Isabelle and
wenzelm@7986
  1351
Isabelle/Isar;
wenzelm@7215
  1352
wenzelm@7791
  1353
* ML function thm_deps visualizes dependencies of theorems and lemmas,
wenzelm@7791
  1354
using the graph browser tool;
wenzelm@7791
  1355
wenzelm@6751
  1356
* Isabelle manuals now also available as PDF;
wenzelm@6751
  1357
wenzelm@6449
  1358
* theory loader rewritten from scratch (may not be fully
wenzelm@6449
  1359
bug-compatible); old loadpath variable has been replaced by show_path,
wenzelm@6671
  1360
add_path, del_path, reset_path functions; new operations such as
wenzelm@7593
  1361
update_thy, touch_thy, remove_thy, use/update_thy_only (see also
wenzelm@7593
  1362
isatool doc ref);
wenzelm@6449
  1363
wenzelm@7215
  1364
* improved isatool install: option -k creates KDE application icon,
wenzelm@7215
  1365
option -p DIR installs standalone binaries;
wenzelm@7215
  1366
wenzelm@7215
  1367
* added ML_PLATFORM setting (useful for cross-platform installations);
wenzelm@7215
  1368
more robust handling of platform specific ML images for SML/NJ;
wenzelm@7215
  1369
wenzelm@7886
  1370
* the settings environment is now statically scoped, i.e. it is never
wenzelm@7986
  1371
created again in sub-processes invoked from isabelle, isatool, or
wenzelm@7886
  1372
Isabelle;
wenzelm@7886
  1373
wenzelm@7215
  1374
* path element specification '~~' refers to '$ISABELLE_HOME';
wenzelm@7215
  1375
wenzelm@6343
  1376
* in locales, the "assumes" and "defines" parts may be omitted if
wenzelm@6343
  1377
empty;
wenzelm@5973
  1378
wenzelm@6269
  1379
* new print_mode "xsymbols" for extended symbol support (e.g. genuine
wenzelm@6269
  1380
long arrows);
wenzelm@6259
  1381
wenzelm@6343
  1382
* new print_mode "HTML";
wenzelm@6343
  1383
wenzelm@6343
  1384
* new flag show_tags controls display of tags of theorems (which are
wenzelm@6343
  1385
basically just comments that may be attached by some tools);
wenzelm@6343
  1386
wenzelm@6461
  1387
* Isamode 2.6 requires patch to accomodate change of Isabelle font
wenzelm@6461
  1388
mode and goal output format:
wenzelm@6461
  1389
wenzelm@6461
  1390
diff -r Isamode-2.6/elisp/isa-load.el Isamode/elisp/isa-load.el
wenzelm@6461
  1391
244c244
wenzelm@6461
  1392
<       (list (isa-getenv "ISABELLE") "-msymbols" logic-name)
wenzelm@6461
  1393
---
wenzelm@6533
  1394
>       (list (isa-getenv "ISABELLE") "-misabelle_font" "-msymbols" logic-name)
wenzelm@6461
  1395
diff -r Isabelle-2.6/elisp/isa-proofstate.el Isamode/elisp/isa-proofstate.el
wenzelm@6461
  1396
181c181
wenzelm@6461
  1397
< (defconst proofstate-proofstart-regexp "^Level [0-9]+$"
wenzelm@6461
  1398
---
wenzelm@6461
  1399
> (defconst proofstate-proofstart-regexp "^Level [0-9]+"
wenzelm@6461
  1400
wenzelm@7450
  1401
* function bind_thms stores lists of theorems (cf. bind_thm);
wenzelm@7450
  1402
wenzelm@7593
  1403
* new shorthand tactics ftac, eatac, datac, fatac;
wenzelm@7593
  1404
wenzelm@7593
  1405
* qed (and friends) now accept "" as result name; in that case the
wenzelm@7986
  1406
theorem is not stored, but proper checks and presentation of the
wenzelm@7986
  1407
result still apply;
wenzelm@7593
  1408
wenzelm@7805
  1409
* theorem database now also indexes constants "Trueprop", "all",
wenzelm@7805
  1410
"==>", "=="; thus thms_containing, findI etc. may retrieve more rules;
wenzelm@7805
  1411
oheimb@6028
  1412
nipkow@6057
  1413
*** HOL ***
nipkow@6057
  1414
wenzelm@7215
  1415
** HOL arithmetic **
wenzelm@7215
  1416
wenzelm@6343
  1417
* There are now decision procedures for linear arithmetic over nat and
wenzelm@6343
  1418
int:
nipkow@6131
  1419
wenzelm@6343
  1420
1. arith_tac copes with arbitrary formulae involving `=', `<', `<=',
wenzelm@6343
  1421
`+', `-', `Suc', `min', `max' and numerical constants; other subterms
wenzelm@6343
  1422
are treated as atomic; subformulae not involving type `nat' or `int'
wenzelm@6343
  1423
are ignored; quantified subformulae are ignored unless they are
wenzelm@6343
  1424
positive universal or negative existential. The tactic has to be
wenzelm@6343
  1425
invoked by hand and can be a little bit slow. In particular, the
wenzelm@6343
  1426
running time is exponential in the number of occurrences of `min' and
wenzelm@6343
  1427
`max', and `-' on `nat'.
nipkow@6131
  1428
wenzelm@6343
  1429
2. fast_arith_tac is a cut-down version of arith_tac: it only takes
wenzelm@6343
  1430
(negated) (in)equalities among the premises and the conclusion into
wenzelm@6343
  1431
account (i.e. no compound formulae) and does not know about `min' and
wenzelm@6343
  1432
`max', and `-' on `nat'. It is fast and is used automatically by the
wenzelm@6343
  1433
simplifier.
nipkow@6131
  1434
wenzelm@6343
  1435
NB: At the moment, these decision procedures do not cope with mixed
wenzelm@6343
  1436
nat/int formulae where the two parts interact, such as `m < n ==>
wenzelm@6343
  1437
int(m) < int(n)'.
oheimb@6028
  1438
wenzelm@7215
  1439
* HOL/Numeral provides a generic theory of numerals (encoded
wenzelm@7313
  1440
efficiently as bit strings); setup for types nat/int/real is in place;
wenzelm@7215
  1441
INCOMPATIBILITY: since numeral syntax is now polymorphic, rather than
wenzelm@7215
  1442
int, existing theories and proof scripts may require a few additional
wenzelm@7215
  1443
type constraints;
wenzelm@7215
  1444
wenzelm@7215
  1445
* integer division and remainder can now be performed on constant
wenzelm@7215
  1446
arguments;
paulson@7157
  1447
wenzelm@7215
  1448
* many properties of integer multiplication, division and remainder
wenzelm@7215
  1449
are now available;
paulson@6922
  1450
paulson@7287
  1451
* An interface to the Stanford Validity Checker (SVC) is available through the
paulson@7287
  1452
tactic svc_tac.  Propositional tautologies and theorems of linear arithmetic
paulson@7287
  1453
are proved automatically.  SVC must be installed separately, and its results
paulson@7287
  1454
must be TAKEN ON TRUST (Isabelle does not check the proofs, but tags any
paulson@7287
  1455
invocation of the underlying oracle).  For SVC see
paulson@7444
  1456
  http://verify.stanford.edu/SVC
paulson@6922
  1457
wenzelm@7125
  1458
* IsaMakefile: the HOL-Real target now builds an actual image;
wenzelm@7125
  1459
wenzelm@7215
  1460
wenzelm@7215
  1461
** HOL misc **
wenzelm@7215
  1462
wenzelm@7595
  1463
* HOL/Real/HahnBanach: the Hahn-Banach theorem for real vector spaces
wenzelm@7595
  1464
(in Isabelle/Isar) -- by Gertrud Bauer;
wenzelm@7595
  1465
wenzelm@7691
  1466
* HOL/BCV: generic model of bytecode verification, i.e. data-flow
wenzelm@7691
  1467
analysis for assembly languages with subtypes;
wenzelm@7691
  1468
wenzelm@6278
  1469
* HOL/TLA (Lamport's Temporal Logic of Actions): major reorganization
wenzelm@6278
  1470
-- avoids syntactic ambiguities and treats state, transition, and
wenzelm@6278
  1471
temporal levels more uniformly; introduces INCOMPATIBILITIES due to
wenzelm@6278
  1472
changed syntax and (many) tactics;
wenzelm@6278
  1473
wenzelm@7791
  1474
* HOL/inductive: Now also handles more general introduction rules such
wenzelm@7791
  1475
  as "ALL y. (y, x) : r --> y : acc r ==> x : acc r"; monotonicity
wenzelm@7791
  1476
  theorems are now maintained within the theory (maintained via the
wenzelm@7791
  1477
  "mono" attribute);
berghofe@7780
  1478
wenzelm@7238
  1479
* HOL/datatype: Now also handles arbitrarily branching datatypes
wenzelm@7238
  1480
  (using function types) such as
wenzelm@7238
  1481
wenzelm@7238
  1482
  datatype 'a tree = Atom 'a | Branch "nat => 'a tree"
berghofe@7047
  1483
wenzelm@7326
  1484
* HOL/record: record_simproc (part of the default simpset) takes care
wenzelm@7326
  1485
of selectors applied to updated records; record_split_tac is no longer
wenzelm@7327
  1486
part of the default claset; update_defs may now be removed from the
wenzelm@7327
  1487
simpset in many cases; COMPATIBILITY: old behavior achieved by
wenzelm@7326
  1488
wenzelm@7326
  1489
  claset_ref () := claset() addSWrapper record_split_wrapper;
wenzelm@7326
  1490
  Delsimprocs [record_simproc]
wenzelm@7326
  1491
wenzelm@6386
  1492
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
  1493
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
  1494
paulson@7287
  1495
* HOL/recdef (TFL): 'congs' syntax now expects comma separated list of theorem
paulson@7287
  1496
names rather than an ML expression;
paulson@7287
  1497
paulson@7287
  1498
* HOL/defer_recdef (TFL): like recdef but the well-founded relation can be
paulson@7287
  1499
supplied later.  Program schemes can be defined, such as
paulson@7287
  1500
    "While B C s = (if B s then While B C (C s) else s)"
paulson@7287
  1501
where the well-founded relation can be chosen after B and C have been given.
wenzelm@6563
  1502
wenzelm@7215
  1503
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
  1504
INCOMPATIBILITY: while [] and infix # syntax is still there, of
wenzelm@7215
  1505
course, ML tools referring to List.list.op # etc. have to be adapted;
wenzelm@7215
  1506
wenzelm@7238
  1507
* HOL_quantifiers flag superseded by "HOL" print mode, which is
wenzelm@7238
  1508
disabled by default; run isabelle with option -m HOL to get back to
wenzelm@7238
  1509
the original Gordon/HOL-style output;
wenzelm@7238
  1510
wenzelm@7238
  1511
* HOL/Ord.thy: new bounded quantifier syntax (input only): ALL x<y. P,
wenzelm@7238
  1512
ALL x<=y. P, EX x<y. P, EX x<=y. P;
wenzelm@7238
  1513
wenzelm@7238
  1514
* HOL basic syntax simplified (more orthogonal): all variants of
wenzelm@7238
  1515
All/Ex now support plain / symbolic / HOL notation; plain syntax for
wenzelm@7238
  1516
Eps operator is provided as well: "SOME x. P[x]";
wenzelm@7238
  1517
berghofe@7320
  1518
* HOL/Sum.thy: sum_case has been moved to HOL/Datatype;
wenzelm@7261
  1519
wenzelm@7280
  1520
* HOL/Univ.thy: infix syntax <*>, <+>, <**>, <+> eliminated and made
wenzelm@7280
  1521
thus available for user theories;
wenzelm@7280
  1522
wenzelm@7300
  1523
* HOLCF/IOA/Sequents: renamed 'Cons' to 'Consq' to avoid clash with
wenzelm@7300
  1524
HOL/List; hardly an INCOMPATIBILITY since '>>' syntax is used all the
wenzelm@7300
  1525
time;
wenzelm@7300
  1526
wenzelm@7986
  1527
* HOL: new tactic smp_tac: int -> int -> tactic, which applies spec
wenzelm@7986
  1528
several times and then mp;
oheimb@7492
  1529
wenzelm@7215
  1530
paulson@7113
  1531
*** LK ***
paulson@7113
  1532
wenzelm@7215
  1533
* the notation <<...>> is now available as a notation for sequences of
wenzelm@7215
  1534
formulas;
paulson@7113
  1535
paulson@7113
  1536
* the simplifier is now installed
paulson@7113
  1537
wenzelm@8729
  1538
* the axiom system has been generalized (thanks to Soren Heilmann)
paulson@7113
  1539
paulson@7113
  1540
* the classical reasoner now has a default rule database
paulson@7113
  1541
paulson@7113
  1542
paulson@6064
  1543
*** ZF ***
paulson@6064
  1544
paulson@6064
  1545
* new primrec section allows primitive recursive functions to be given
wenzelm@6269
  1546
directly (as in HOL) over datatypes and the natural numbers;
paulson@6064
  1547
wenzelm@6269
  1548
* new tactics induct_tac and exhaust_tac for induction (or case
wenzelm@6269
  1549
analysis) over datatypes and the natural numbers;
paulson@6064
  1550
paulson@6064
  1551
* the datatype declaration of type T now defines the recursor T_rec;
paulson@6064
  1552
paulson@6141
  1553
* simplification automatically does freeness reasoning for datatype
wenzelm@6269
  1554
constructors;
paulson@6141
  1555
wenzelm@6269
  1556
* automatic type-inference, with AddTCs command to insert new
wenzelm@6269
  1557
type-checking rules;
paulson@6155
  1558
wenzelm@6269
  1559
* datatype introduction rules are now added as Safe Introduction rules
wenzelm@6269
  1560
to the claset;
paulson@6155
  1561
wenzelm@6269
  1562
* the syntax "if P then x else y" is now available in addition to
wenzelm@6269
  1563
if(P,x,y);
wenzelm@6269
  1564
paulson@6069
  1565
wenzelm@6343
  1566
*** Internal programming interfaces ***
wenzelm@6343
  1567
wenzelm@7919
  1568
* tuned simplifier trace output; new flag debug_simp;
wenzelm@7919
  1569
wenzelm@7420
  1570
* structures Vartab / Termtab (instances of TableFun) offer efficient
wenzelm@7420
  1571
tables indexed by indexname_ord / term_ord (compatible with aconv);
wenzelm@7420
  1572
wenzelm@6386
  1573
* AxClass.axclass_tac lost the theory argument;
wenzelm@6386
  1574
wenzelm@6343
  1575
* tuned current_goals_markers semantics: begin / end goal avoids
wenzelm@6343
  1576
printing empty lines;
wenzelm@6343
  1577
wenzelm@6343
  1578
* removed prs and prs_fn hook, which was broken because it did not
wenzelm@6343
  1579
include \n in its semantics, forcing writeln to add one
wenzelm@6343
  1580
uncoditionally; replaced prs_fn by writeln_fn; consider std_output:
wenzelm@6343
  1581
string -> unit if you really want to output text without newline;
wenzelm@6343
  1582
wenzelm@6343
  1583
* Symbol.output subject to print mode; INCOMPATIBILITY: defaults to
wenzelm@6343
  1584
plain output, interface builders may have to enable 'isabelle_font'
wenzelm@6343
  1585
mode to get Isabelle font glyphs as before;
wenzelm@6343
  1586
wenzelm@6343
  1587
* refined token_translation interface; INCOMPATIBILITY: output length
wenzelm@6343
  1588
now of type real instead of int;
wenzelm@6343
  1589
wenzelm@7196
  1590
* theory loader actions may be traced via new ThyInfo.add_hook
wenzelm@7196
  1591
interface (see src/Pure/Thy/thy_info.ML); example application: keep
wenzelm@7196
  1592
your own database of information attached to *whole* theories -- as
wenzelm@7196
  1593
opposed to intra-theory data slots offered via TheoryDataFun;
wenzelm@7196
  1594
wenzelm@7647
  1595
* proper handling of dangling sort hypotheses (at last!);
wenzelm@7647
  1596
Thm.strip_shyps and Drule.strip_shyps_warning take care of removing
wenzelm@7647
  1597
extra sort hypotheses that can be witnessed from the type signature;
wenzelm@7986
  1598
the force_strip_shyps flag is gone, any remaining shyps are simply
wenzelm@7986
  1599
left in the theorem (with a warning issued by strip_shyps_warning);
wenzelm@7647
  1600
wenzelm@6343
  1601
paulson@6064
  1602
wenzelm@5781
  1603
New in Isabelle98-1 (October 1998)
wenzelm@5781
  1604
----------------------------------
wenzelm@5781
  1605
wenzelm@5127
  1606
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4842
  1607
wenzelm@5726
  1608
* several changes of automated proof tools;
wenzelm@5373
  1609
wenzelm@5726
  1610
* HOL: major changes to the inductive and datatype packages, including
wenzelm@5726
  1611
some minor incompatibilities of theory syntax;
berghofe@5214
  1612
wenzelm@5726
  1613
* HOL: renamed r^-1 to 'converse' from 'inverse'; 'inj_onto' is now
wenzelm@5217
  1614
called `inj_on';
paulson@5160
  1615
nipkow@5275
  1616
* HOL: removed duplicate thms in Arith:
nipkow@5275
  1617
  less_imp_add_less  should be replaced by  trans_less_add1
nipkow@5275
  1618
  le_imp_add_le      should be replaced by  trans_le_add1
paulson@5160
  1619
wenzelm@5726
  1620
* HOL: unary minus is now overloaded (new type constraints may be
wenzelm@5726
  1621
required);
paulson@5490
  1622
wenzelm@5726
  1623
* HOL and ZF: unary minus for integers is now #- instead of #~.  In
wenzelm@5726
  1624
ZF, expressions such as n#-1 must be changed to n#- 1, since #-1 is
wenzelm@5726
  1625
now taken as an integer constant.
paulson@5541
  1626
wenzelm@5726
  1627
* Pure: ML function 'theory_of' renamed to 'theory';
wenzelm@5397
  1628
wenzelm@5363
  1629
wenzelm@5127
  1630
*** Proof tools ***
nipkow@4880
  1631
nipkow@5657
  1632
* Simplifier:
nipkow@5657
  1633
  1. Asm_full_simp_tac is now more aggressive.
nipkow@5657
  1634
     1. It will sometimes reorient premises if that increases their power to
nipkow@5657
  1635
        simplify.
nipkow@5657
  1636
     2. It does no longer proceed strictly from left to right but may also
nipkow@5657
  1637
        rotate premises to achieve further simplification.
nipkow@5657
  1638
     For compatibility reasons there is now Asm_lr_simp_tac which is like the
nipkow@5657
  1639
     old Asm_full_simp_tac in that it does not rotate premises.
nipkow@5657
  1640
  2. The simplifier now knows a little bit about nat-arithmetic.
nipkow@4880
  1641
wenzelm@5127
  1642
* Classical reasoner: wrapper mechanism for the classical reasoner now
wenzelm@5127
  1643
allows for selected deletion of wrappers, by introduction of names for
wenzelm@5127
  1644
wrapper functionals.  This implies that addbefore, addSbefore,
wenzelm@5127
  1645
addaltern, and addSaltern now take a pair (name, tactic) as argument,
wenzelm@5127
  1646
and that adding two tactics with the same name overwrites the first
wenzelm@5127
  1647
one (emitting a warning).
oheimb@4824
  1648
  type wrapper = (int -> tactic) -> (int -> tactic)
oheimb@4649
  1649
  setWrapper, setSWrapper, compWrapper and compSWrapper are replaced by
oheimb@4824
  1650
  addWrapper, addSWrapper: claset * (string * wrapper) -> claset
oheimb@4824
  1651
  delWrapper, delSWrapper: claset *  string            -> claset
oheimb@4649
  1652
  getWrapper is renamed to appWrappers, getSWrapper to appSWrappers;
oheimb@4649
  1653
wenzelm@5705
  1654
* Classical reasoner: addbefore/addSbefore now have APPEND/ORELSE
wenzelm@5726
  1655
semantics; addbefore now affects only the unsafe part of step_tac
wenzelm@5726
  1656
etc.; this affects addss/auto_tac/force_tac, so EXISTING PROOFS MAY
wenzelm@5726
  1657
FAIL, but proofs should be fixable easily, e.g. by replacing Auto_tac
wenzelm@5726
  1658
by Force_tac;
oheimb@5524
  1659
wenzelm@5726
  1660
* Classical reasoner: setwrapper to setWrapper and compwrapper to
wenzelm@5726
  1661
compWrapper; added safe wrapper (and access functions for it);
oheimb@5524
  1662
wenzelm@5127
  1663
* HOL/split_all_tac is now much faster and fails if there is nothing
wenzelm@5726
  1664
to split.  Some EXISTING PROOFS MAY REQUIRE ADAPTION because the order
wenzelm@5726
  1665
and the names of the automatically generated variables have changed.
wenzelm@5726
  1666
split_all_tac has moved within claset() from unsafe wrappers to safe
wenzelm@5726
  1667
wrappers, which means that !!-bound variables are split much more
wenzelm@5726
  1668
aggressively, and safe_tac and clarify_tac now split such variables.
wenzelm@5726
  1669
If this splitting is not appropriate, use delSWrapper "split_all_tac".
wenzelm@5726
  1670
Note: the same holds for record_split_tac, which does the job of
wenzelm@5726
  1671
split_all_tac for record fields.
wenzelm@5127
  1672
wenzelm@5726
  1673
* HOL/Simplifier: Rewrite rules for case distinctions can now be added
wenzelm@5726
  1674
permanently to the default simpset using Addsplits just like
wenzelm@5726
  1675
Addsimps. They can be removed via Delsplits just like
wenzelm@5726
  1676
Delsimps. Lower-case versions are also available.
wenzelm@5127
  1677
wenzelm@5726
  1678
* HOL/Simplifier: The rule split_if is now part of the default
wenzelm@5726
  1679
simpset. This means that the simplifier will eliminate all occurrences
wenzelm@5726
  1680
of if-then-else in the conclusion of a goal. To prevent this, you can
wenzelm@5726
  1681
either remove split_if completely from the default simpset by
wenzelm@5726
  1682
`Delsplits [split_if]' or remove it in a specific call of the
wenzelm@5726
  1683
simplifier using `... delsplits [split_if]'.  You can also add/delete
wenzelm@5726
  1684
other case splitting rules to/from the default simpset: every datatype
wenzelm@5726
  1685
generates suitable rules `split_t_case' and `split_t_case_asm' (where
wenzelm@5726
  1686
t is the name of the datatype).
wenzelm@5127
  1687
wenzelm@5726
  1688
* Classical reasoner / Simplifier combination: new force_tac (and
wenzelm@5127
  1689
derivatives Force_tac, force) combines rewriting and classical
wenzelm@5127
  1690
reasoning (and whatever other tools) similarly to auto_tac, but is
wenzelm@5726
  1691
aimed to solve the given subgoal completely.
wenzelm@5127
  1692
wenzelm@5127
  1693
wenzelm@5127
  1694
*** General ***
wenzelm@5127
  1695
wenzelm@5217
  1696
* new top-level commands `Goal' and `Goalw' that improve upon `goal'
wenzelm@5127
  1697
and `goalw': the theory is no longer needed as an explicit argument -
wenzelm@5127
  1698
the current theory context is used; assumptions are no longer returned
wenzelm@5127
  1699
at the ML-level unless one of them starts with ==> or !!; it is
wenzelm@5217
  1700
recommended to convert to these new commands using isatool fixgoal
wenzelm@5217
  1701
(backup your sources first!);
wenzelm@4842
  1702
wenzelm@5217
  1703
* new top-level commands 'thm' and 'thms' for retrieving theorems from
wenzelm@5207
  1704
the current theory context, and 'theory' to lookup stored theories;
paulson@4806
  1705
paulson@5722
  1706
* new theory section 'locale' for declaring constants, assumptions and
paulson@5722
  1707
definitions that have local scope;
paulson@5722
  1708
wenzelm@5127
  1709
* new theory section 'nonterminals' for purely syntactic types;
wenzelm@4858
  1710
wenzelm@5127
  1711
* new theory section 'setup' for generic ML setup functions
wenzelm@5127
  1712
(e.g. package initialization);
wenzelm@4869
  1713
wenzelm@5131
  1714
* the distribution now includes Isabelle icons: see
wenzelm@5131
  1715
lib/logo/isabelle-{small,tiny}.xpm;
wenzelm@5131
  1716
wenzelm@5363
  1717
* isatool install - install binaries with absolute references to
wenzelm@5363
  1718
ISABELLE_HOME/bin;
wenzelm@5363
  1719
wenzelm@5572
  1720
* isatool logo -- create instances of the Isabelle logo (as EPS);
wenzelm@5572
  1721
wenzelm@5407
  1722
* print mode 'emacs' reserved for Isamode;
wenzelm@5407
  1723
wenzelm@5726
  1724
* support multiple print (ast) translations per constant name;
wenzelm@5726
  1725
wenzelm@6925
  1726
* theorems involving oracles are now printed with a suffixed [!];
wenzelm@6925
  1727
wenzelm@4711
  1728
paulson@4661
  1729
*** HOL ***
paulson@4661
  1730
wenzelm@5710
  1731
* there is now a tutorial on Isabelle/HOL (do 'isatool doc tutorial');
nipkow@5709
  1732
wenzelm@5217
  1733
* HOL/inductive package reorganized and improved: now supports mutual
paulson@5267
  1734
definitions such as
wenzelm@5217
  1735
wenzelm@5217
  1736
  inductive EVEN ODD
wenzelm@5217
  1737
    intrs
wenzelm@5217
  1738
      null "0 : EVEN"
wenzelm@5217
  1739
      oddI "n : EVEN ==> Suc n : ODD"
wenzelm@5217
  1740
      evenI "n : ODD ==> Suc n : EVEN"
wenzelm@5217
  1741
wenzelm@5217
  1742
new theorem list "elims" contains an elimination rule for each of the
wenzelm@5217
  1743
recursive sets; inductive definitions now handle disjunctive premises
wenzelm@5217
  1744
correctly (also ZF);
berghofe@5214
  1745
wenzelm@5217
  1746
INCOMPATIBILITIES: requires Inductive as an ancestor; component
wenzelm@5217
  1747
"mutual_induct" no longer exists - the induction rule is always
wenzelm@5217
  1748
contained in "induct";
wenzelm@5217
  1749
wenzelm@5217
  1750
wenzelm@5217
  1751
* HOL/datatype package re-implemented and greatly improved: now
paulson@5267
  1752
supports mutually recursive datatypes such as
wenzelm@5217
  1753
wenzelm@5217
  1754
  datatype
wenzelm@5217
  1755
    'a aexp = IF_THEN_ELSE ('a bexp) ('a aexp) ('a aexp)
wenzelm@5217
  1756
            | SUM ('a aexp) ('a aexp)
wenzelm@5217
  1757
            | DIFF ('a aexp) ('a aexp)
wenzelm@5217
  1758
            | NUM 'a
wenzelm@5217
  1759
  and
wenzelm@5217
  1760
    'a bexp = LESS ('a aexp) ('a aexp)
wenzelm@5217
  1761
            | AND ('a bexp) ('a bexp)
wenzelm@5217
  1762
            | OR ('a bexp) ('a bexp)
wenzelm@5217
  1763
paulson@5267
  1764
as well as indirectly recursive datatypes such as
berghofe@5214
  1765
wenzelm@5217
  1766
  datatype
wenzelm@5217
  1767
    ('a, 'b) term = Var 'a
wenzelm@5217
  1768
                  | App 'b ((('a, 'b) term) list)
berghofe@5214
  1769
wenzelm@5217
  1770
The new tactic  mutual_induct_tac [<var_1>, ..., <var_n>] i  performs
wenzelm@5217
  1771
induction on mutually / indirectly recursive datatypes.
wenzelm@5217
  1772
wenzelm@5217
  1773
Primrec equations are now stored in theory and can be accessed via
wenzelm@5217
  1774
<function_name>.simps.
wenzelm@5217
  1775
wenzelm@5217
  1776
INCOMPATIBILITIES:
berghofe@5214
  1777
wenzelm@5217
  1778
  - Theories using datatypes must now have theory Datatype as an
wenzelm@5217
  1779
    ancestor.
wenzelm@5217
  1780
  - The specific <typename>.induct_tac no longer exists - use the
wenzelm@5217
  1781
    generic induct_tac instead.
berghofe@5226
  1782
  - natE has been renamed to nat.exhaust - use exhaust_tac
wenzelm@5217
  1783
    instead of res_inst_tac ... natE. Note that the variable
berghofe@5226
  1784
    names in nat.exhaust differ from the names in natE, this
wenzelm@5217
  1785
    may cause some "fragile" proofs to fail.
wenzelm@5217
  1786
  - The theorems split_<typename>_case and split_<typename>_case_asm
wenzelm@5217
  1787
    have been renamed to <typename>.split and <typename>.split_asm.
wenzelm@5217
  1788
  - Since default sorts of type variables are now handled correctly,
wenzelm@5217
  1789
    some datatype definitions may have to be annotated with explicit
wenzelm@5217
  1790
    sort constraints.
wenzelm@5217
  1791
  - Primrec definitions no longer require function name and type
wenzelm@5217
  1792
    of recursive argument.
berghofe@5214
  1793
wenzelm@5217
  1794
Consider using isatool fixdatatype to adapt your theories and proof
wenzelm@5217
  1795
scripts to the new package (backup your sources first!).
wenzelm@5217
  1796
wenzelm@5217
  1797
wenzelm@5726
  1798
* HOL/record package: considerably improved implementation; now
wenzelm@5726
  1799
includes concrete syntax for record types, terms, updates; theorems
wenzelm@5726
  1800
for surjective pairing and splitting !!-bound record variables; proof
wenzelm@5726
  1801
support is as follows:
wenzelm@5726
  1802
wenzelm@5726
  1803
  1) standard conversions (selectors or updates applied to record
wenzelm@5726
  1804
constructor terms) are part of the standard simpset;
wenzelm@5726
  1805
wenzelm@5726
  1806
  2) inject equations of the form ((x, y) = (x', y')) == x=x' & y=y' are
wenzelm@5726
  1807
made part of standard simpset and claset via addIffs;
wenzelm@5726
  1808
wenzelm@5726
  1809
  3) a tactic for record field splitting (record_split_tac) is part of
wenzelm@5726
  1810
the standard claset (addSWrapper);
wenzelm@5726
  1811
wenzelm@5726
  1812
To get a better idea about these rules you may retrieve them via
wenzelm@5726
  1813
something like 'thms "foo.simps"' or 'thms "foo.iffs"', where "foo" is
wenzelm@5726
  1814
the name of your record type.
wenzelm@5726
  1815
wenzelm@5726
  1816
The split tactic 3) conceptually simplifies by the following rule:
wenzelm@5726
  1817
wenzelm@5726
  1818
  "(!!x. PROP ?P x) == (!!a b. PROP ?P (a, b))"
wenzelm@5726
  1819
wenzelm@5726
  1820
Thus any record variable that is bound by meta-all will automatically
wenzelm@5726
  1821
blow up into some record constructor term, consequently the
wenzelm@5726
  1822
simplifications of 1), 2) apply.  Thus force_tac, auto_tac etc. shall
wenzelm@5726
  1823
solve record problems automatically.
wenzelm@5726
  1824
berghofe@5214
  1825
wenzelm@5125
  1826
* reorganized the main HOL image: HOL/Integ and String loaded by
wenzelm@5125
  1827
default; theory Main includes everything;
wenzelm@5125
  1828
paulson@5650
  1829
* automatic simplification of integer sums and comparisons, using cancellation;
paulson@5650
  1830
oheimb@5526
  1831
* added option_map_eq_Some and not_Some_eq to the default simpset and claset;
wenzelm@5127
  1832
wenzelm@5127
  1833
* added disj_not1 = "(~P | Q) = (P --> Q)" to the default simpset;
wenzelm@5127
  1834
wenzelm@5127
  1835
* many new identities for unions, intersections, set difference, etc.;
wenzelm@5127
  1836
wenzelm@5127
  1837
* expand_if, expand_split, expand_sum_case and expand_nat_case are now
wenzelm@5127
  1838
called split_if, split_split, split_sum_case and split_nat_case (to go
wenzelm@5127
  1839
with add/delsplits);
wenzelm@5125
  1840
wenzelm@5127
  1841
* HOL/Prod introduces simplification procedure unit_eq_proc rewriting
wenzelm@5127
  1842
(?x::unit) = (); this is made part of the default simpset, which COULD
wenzelm@5127
  1843
MAKE EXISTING PROOFS FAIL under rare circumstances (consider
wenzelm@5207
  1844
'Delsimprocs [unit_eq_proc];' as last resort); also note that
wenzelm@5207
  1845
unit_abs_eta_conv is added in order to counter the effect of
wenzelm@5207
  1846
unit_eq_proc on (%u::unit. f u), replacing it by f rather than by
wenzelm@5207
  1847
%u.f();
wenzelm@5125
  1848
wenzelm@5217
  1849
* HOL/Fun INCOMPATIBILITY: `inj_onto' is now called `inj_on' (which
wenzelm@5217
  1850
makes more sense);
berghofe@5109
  1851
paulson@5475
  1852
* HOL/Set INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
  1853
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
  1854
  disjointness reasoning but breaking a few old proofs.
paulson@5267
  1855
wenzelm@5217
  1856
* HOL/Relation INCOMPATIBILITY: renamed the relational operator r^-1
wenzelm@5217
  1857
to 'converse' from 'inverse' (for compatibility with ZF and some
wenzelm@5217
  1858
literature);
wenzelm@5085
  1859
wenzelm@5127
  1860
* HOL/recdef can now declare non-recursive functions, with {} supplied as
wenzelm@5127
  1861
the well-founded relation;
oheimb@4838
  1862
paulson@5490
  1863
* HOL/Set INCOMPATIBILITY: the complement of set A is now written -A instead of
paulson@5490
  1864
    Compl A.  The "Compl" syntax remains available as input syntax for this
paulson@5490
  1865
    release ONLY.
paulson@5490
  1866
wenzelm@5127
  1867
* HOL/Update: new theory of function updates:
wenzelm@5127
  1868
    f(a:=b) == %x. if x=a then b else f x
wenzelm@5127
  1869
may also be iterated as in f(a:=b,c:=d,...);
nipkow@5077
  1870
wenzelm@5127
  1871
* HOL/Vimage: new theory for inverse image of a function, syntax f-``B;
paulson@4899
  1872
nipkow@5282
  1873
* HOL/List:
nipkow@5282
  1874
  - new function list_update written xs[i:=v] that updates the i-th
nipkow@5282
  1875
    list position. May also be iterated as in xs[i:=a,j:=b,...].
nipkow@5428
  1876
  - new function `upt' written [i..j(] which generates the list
nipkow@5428
  1877
    [i,i+1,...,j-1], i.e. the upper bound is excluded. To include the upper
nipkow@5428
  1878
    bound write [i..j], which is a shorthand for [i..j+1(].
nipkow@5282
  1879
  - new lexicographic orderings and corresponding wellfoundedness theorems.
paulson@4779
  1880
wenzelm@5127
  1881
* HOL/Arith:
wenzelm@5127
  1882
  - removed 'pred' (predecessor) function;
wenzelm@5127
  1883
  - generalized some theorems about n-1;
wenzelm@5127
  1884
  - many new laws about "div" and "mod";
wenzelm@5127
  1885
  - new laws about greatest common divisors (see theory ex/Primes);
oheimb@4766
  1886
wenzelm@5127
  1887
* HOL/Relation: renamed the relational operator r^-1 "converse"
wenzelm@4842
  1888
instead of "inverse";
wenzelm@4711
  1889
nipkow@5651
  1890
* HOL/Induct/Multiset: a theory of multisets, including the wellfoundedness
nipkow@5651
  1891
  of the multiset ordering;
nipkow@5651
  1892
wenzelm@5127
  1893
* directory HOL/Real: a construction of the reals using Dedekind cuts
nipkow@5651
  1894
  (not included by default);
nipkow@4835
  1895
wenzelm@5127
  1896
* directory HOL/UNITY: Chandy and Misra's UNITY formalism;
wenzelm@4711
  1897
nipkow@5651
  1898
* directory HOL/Hoare: a new version of Hoare logic which permits many-sorted
nipkow@5651
  1899
  programs, i.e. different program variables may have different types.
nipkow@5651
  1900
paulson@5142
  1901
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
  1902
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
  1903
  Now rew can involve either definitions or equalities (either == or =).
wenzelm@5002
  1904
wenzelm@5363
  1905
paulson@4879
  1906
*** ZF ***
paulson@4879
  1907
paulson@5332
  1908
* theory Main includes everything; INCOMPATIBILITY: theory ZF.thy contains
paulson@5332
  1909
  only the theorems proved on ZF.ML;
paulson@5160
  1910
paulson@5475
  1911
* ZF INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
  1912
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
  1913
  disjointness reasoning but breaking a few old proofs.
paulson@5267
  1914
paulson@5160
  1915
* ZF/Update: new theory of function updates
paulson@5160
  1916
    with default rewrite rule  f(x:=y) ` z = if(z=x, y, f`z)
paulson@5160
  1917
  may also be iterated as in f(a:=b,c:=d,...);
paulson@5160
  1918
paulson@4879
  1919
* in  let x=t in u(x), neither t nor u(x) has to be an FOL term.
oheimb@4649
  1920
paulson@5142
  1921
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
  1922
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
  1923
  Now rew can involve either definitions or equalities (either == or =).
paulson@5142
  1924
paulson@5160
  1925
* case_tac provided for compatibility with HOL
paulson@5160
  1926
    (like the old excluded_middle_tac, but with subgoals swapped)
paulson@5160
  1927
wenzelm@4842
  1928
wenzelm@5127
  1929
*** Internal programming interfaces ***
wenzelm@5002
  1930
wenzelm@5251
  1931
* Pure: several new basic modules made available for general use, see
wenzelm@5251
  1932
also src/Pure/README;
wenzelm@5207
  1933
wenzelm@5008
  1934
* improved the theory data mechanism to support encapsulation (data
wenzelm@5008
  1935
kind name replaced by private Object.kind, acting as authorization
wenzelm@5373
  1936
key); new type-safe user interface via functor TheoryDataFun; generic
wenzelm@5373
  1937
print_data function becomes basically useless;
wenzelm@5002
  1938
wenzelm@5251
  1939
* removed global_names compatibility flag -- all theory declarations
wenzelm@5251
  1940
are qualified by default;
wenzelm@5251
  1941
wenzelm@5085
  1942
* module Pure/Syntax now offers quote / antiquote translation
wenzelm@5085
  1943
functions (useful for Hoare logic etc. with implicit dependencies);
wenzelm@5373
  1944
see HOL/ex/Antiquote for an example use;
wenzelm@5085
  1945
wenzelm@5127
  1946
* Simplifier now offers conversions (asm_)(full_)rewrite: simpset ->
wenzelm@5127
  1947
cterm -> thm;
wenzelm@5127
  1948
wenzelm@5207
  1949
* new tactical CHANGED_GOAL for checking that a tactic modifies a
wenzelm@5207
  1950
subgoal;
paulson@5142
  1951
wenzelm@5251
  1952
* Display.print_goals function moved to Locale.print_goals;
wenzelm@5251
  1953
wenzelm@5731
  1954
* standard print function for goals supports current_goals_markers
wenzelm@5731
  1955
variable for marking begin of proof, end of proof, start of goal; the
wenzelm@5731
  1956
default is ("", "", ""); setting current_goals_markers := ("<proof>",
wenzelm@5731
  1957
"</proof>", "<goal>") causes SGML like tagged proof state printing,
wenzelm@5731
  1958
for example;
wenzelm@5731
  1959
wenzelm@5002
  1960
wenzelm@5002
  1961
wenzelm@4410
  1962
New in Isabelle98 (January 1998)
wenzelm@4410
  1963
--------------------------------
wenzelm@4410
  1964
wenzelm@4410
  1965
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4410
  1966
wenzelm@4410
  1967
* changed lexical syntax of terms / types: dots made part of long
wenzelm@4410
  1968
identifiers, e.g. "%x.x" no longer possible, should be "%x. x";
wenzelm@4410
  1969
wenzelm@4410
  1970
* simpset (and claset) reference variable replaced by functions
wenzelm@4410
  1971
simpset / simpset_ref;
wenzelm@4410
  1972
wenzelm@4410
  1973
* no longer supports theory aliases (via merge) and non-trivial
wenzelm@4410
  1974
implicit merge of thms' signatures;
wenzelm@4410
  1975
wenzelm@4410
  1976
* most internal names of constants changed due to qualified names;
wenzelm@4410
  1977
wenzelm@4410
  1978
* changed Pure/Sequence interface (see Pure/seq.ML);
wenzelm@4410
  1979
wenzelm@3454
  1980
paulson@3715
  1981
*** General Changes ***
paulson@3715
  1982
wenzelm@4174
  1983
* hierachically structured name spaces (for consts, types, axms, thms
wenzelm@3943
  1984
etc.); new lexical class 'longid' (e.g. Foo.bar.x) may render much of
wenzelm@4108
  1985
old input syntactically incorrect (e.g. "%x.x"); COMPATIBILITY:
wenzelm@4108
  1986
isatool fixdots ensures space after dots (e.g. "%x. x"); set
wenzelm@4174
  1987
long_names for fully qualified output names; NOTE: ML programs
wenzelm@4174
  1988
(special tactics, packages etc.) referring to internal names may have
wenzelm@4174
  1989
to be adapted to cope with fully qualified names; in case of severe
wenzelm@4174
  1990
backward campatibility problems try setting 'global_names' at compile
wenzelm@4174
  1991
time to have enrything declared within a flat name space; one may also
wenzelm@4174
  1992
fine tune name declarations in theories via the 'global' and 'local'
wenzelm@4174
  1993
section;
wenzelm@4108
  1994
wenzelm@4108
  1995
* reimplemented the implicit simpset and claset using the new anytype
wenzelm@4108
  1996
data filed in signatures; references simpset:simpset ref etc. are
wenzelm@4108
  1997
replaced by functions simpset:unit->simpset and
wenzelm@4108
  1998
simpset_ref:unit->simpset ref; COMPATIBILITY: use isatool fixclasimp
wenzelm@4108
  1999
to patch your ML files accordingly;
paulson@3856
  2000
wenzelm@3857
  2001
* HTML output now includes theory graph data for display with Java
wenzelm@3857
  2002
applet or isatool browser; data generated automatically via isatool
wenzelm@3901
  2003
usedir (see -i option, ISABELLE_USEDIR_OPTIONS);
wenzelm@3857
  2004
paulson@3856
  2005
* defs may now be conditional; improved rewrite_goals_tac to handle
paulson@3856
  2006
conditional equations;
paulson@3856
  2007
wenzelm@4174
  2008
* defs now admits additional type arguments, using TYPE('a) syntax;
wenzelm@4174
  2009
wenzelm@3901
  2010
* theory aliases via merge (e.g. M=A+B+C) no longer supported, always
wenzelm@3901
  2011
creates a new theory node; implicit merge of thms' signatures is
wenzelm@4112
  2012
restricted to 'trivial' ones; COMPATIBILITY: one may have to use
wenzelm@3901
  2013
transfer:theory->thm->thm in (rare) cases;
wenzelm@3901
  2014
wenzelm@3968
  2015
* improved handling of draft signatures / theories; draft thms (and
wenzelm@3968
  2016
ctyps, cterms) are automatically promoted to real ones;
wenzelm@3968
  2017
wenzelm@3901
  2018
* slightly changed interfaces for oracles: admit many per theory, named
wenzelm@3901
  2019
(e.g. oracle foo = mlfun), additional name argument for invoke_oracle;
wenzelm@3901
  2020
wenzelm@3901
  2021
* print_goals: optional output of const types (set show_consts and
wenzelm@3901
  2022
show_types);
wenzelm@3851
  2023
wenzelm@4388
  2024
* improved output of warnings (###) and errors (***);
wenzelm@3697
  2025
paulson@4178
  2026
* subgoal_tac displays a warning if the new subgoal has type variables;
paulson@4178
  2027
paulson@3715
  2028
* removed old README and Makefiles;
wenzelm@3697
  2029
paulson@3856
  2030
* replaced print_goals_ref hook by print_current_goals_fn and result_error_fn;
wenzelm@3670
  2031
paulson@3715
  2032
* removed obsolete init_pps and init_database;
paulson@3715
  2033
paulson@3715
  2034
* deleted the obsolete tactical STATE, which was declared by
paulson@3715
  2035
    fun STATE tacfun st = tacfun st st;
paulson@3715
  2036
wenzelm@4388
  2037
* cd and use now support path variables, e.g. $ISABELLE_HOME, or ~
wenzelm@4388
  2038
(which abbreviates $HOME);
wenzelm@4269
  2039
wenzelm@4269
  2040
* changed Pure/Sequence interface (see Pure/seq.ML); COMPATIBILITY:
wenzelm@4269
  2041
use isatool fixseq to adapt your ML programs (this works for fully
wenzelm@4269
  2042
qualified references to the Sequence structure only!);
wenzelm@4269
  2043
wenzelm@4381
  2044
* use_thy no longer requires writable current directory; it always
wenzelm@4381
  2045
reloads .ML *and* .thy file, if either one is out of date;
wenzelm@4269
  2046
paulson@3715
  2047
paulson@3715
  2048
*** Classical Reasoner ***
paulson@3715
  2049
wenzelm@3744
  2050
* Clarify_tac, clarify_tac, clarify_step_tac, Clarify_step_tac: new
wenzelm@3744
  2051
tactics that use classical reasoning to simplify a subgoal without
wenzelm@3744
  2052
splitting it into several subgoals;
paulson@3715
  2053
paulson@3719
  2054
* Safe_tac: like safe_tac but uses the default claset;
paulson@3719
  2055
paulson@3715
  2056
paulson@3715
  2057
*** Simplifier ***
paulson@3715
  2058
paulson@3715
  2059
* added simplification meta rules:
paulson@3715
  2060
    (asm_)(full_)simplify: simpset -> thm -> thm;
paulson@3715
  2061
paulson@3715
  2062
* simplifier.ML no longer part of Pure -- has to be loaded by object
paulson@3715
  2063
logics (again);
paulson@3715
  2064
paulson@3715
  2065
* added prems argument to simplification procedures;
paulson@3715
  2066
paulson@4325
  2067
* HOL, FOL, ZF: added infix function `addsplits':
paulson@4325
  2068
  instead of `<simpset> setloop (split_tac <thms>)'
paulson@4325
  2069
  you can simply write `<simpset> addsplits <thms>'
paulson@4325
  2070
paulson@3715
  2071
paulson@3715
  2072
*** Syntax ***
paulson@3715
  2073
wenzelm@4174
  2074
* TYPE('a) syntax for type reflection terms;
wenzelm@4174
  2075
wenzelm@3985
  2076
* no longer handles consts with name "" -- declare as 'syntax' instead;
paulson@3856
  2077
paulson@3856
  2078
* pretty printer: changed order of mixfix annotation preference (again!);
wenzelm@3846
  2079
paulson@3715
  2080
* Pure: fixed idt/idts vs. pttrn/pttrns syntactic categories;
paulson@3715
  2081
paulson@3715
  2082
paulson@3715
  2083
*** HOL ***
paulson@3715
  2084
wenzelm@5726
  2085
* HOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  2086
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
  2087
nipkow@4035
  2088
* HOL/TLA: Stephan Merz's formalization of Lamport's Temporal Logic of Actions;
wenzelm@3985
  2089
wenzelm@3985
  2090
* HOL/Auth: new protocol proofs including some for the Internet
nipkow@4035
  2091
  protocol TLS;
wenzelm@3985
  2092
wenzelm@4125
  2093
* HOL/Map: new theory of `maps' a la VDM;
nipkow@3982
  2094
wenzelm@4335
  2095
* HOL/simplifier: simplification procedures nat_cancel_sums for
wenzelm@4335
  2096
cancelling out common nat summands from =, <, <= (in)equalities, or
wenzelm@4335
  2097
differences; simplification procedures nat_cancel_factor for
wenzelm@4335
  2098
cancelling common factor from =, <, <= (in)equalities over natural
wenzelm@4373
  2099
sums; nat_cancel contains both kinds of procedures, it is installed by
wenzelm@4373
  2100
default in Arith.thy -- this COULD MAKE EXISTING PROOFS FAIL;
wenzelm@4335
  2101
nipkow@3580
  2102
* HOL/simplifier: terms of the form
paulson@4325
  2103
  `? x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x)'  (or t=x)
nipkow@3580
  2104
  are rewritten to
nipkow@4035
  2105
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t)',
nipkow@4035
  2106
  and those of the form
paulson@4325
  2107
  `! x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x) --> R(x)'  (or t=x)
nipkow@4035
  2108
  are rewritten to
nipkow@4035
  2109
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t) --> R(t)',
nipkow@4035
  2110
nipkow@4035
  2111
* HOL/datatype
nipkow@4035
  2112
  Each datatype `t' now comes with a theorem `split_t_case' of the form
nipkow@3580
  2113
nipkow@4035
  2114
  P(t_case f1 ... fn x) =
nipkow@4035
  2115
     ( (!y1 ... ym1. x = C1 y1 ... ym1 --> P(f1 y1 ... ym1)) &
nipkow@4035
  2116
        ...
oheimb@4189
  2117
       (!y1 ... ymn. x = Cn y1 ... ymn --> P(f1 y1 ... ymn))
nipkow@4035
  2118
     )
nipkow@4035
  2119
oheimb@4930
  2120
  and a theorem `split_t_case_asm' of the form
oheimb@4189
  2121
oheimb@4189
  2122
  P(t_case f1 ... fn x) =
oheimb@4189
  2123
    ~( (? y1 ... ym1. x = C1 y1 ... ym1 & ~P(f1 y1 ... ym1)) |
oheimb@4189
  2124
        ...
oheimb@4189
  2125
       (? y1 ... ymn. x = Cn y1 ... ymn & ~P(f1 y1 ... ymn))
oheimb@4189
  2126
     )
oheimb@4930
  2127
  which can be added to a simpset via `addsplits'. The existing theorems
oheimb@4930
  2128
  expand_list_case and expand_option_case have been renamed to
oheimb@4930
  2129
  split_list_case and split_option_case.
oheimb@4189
  2130
nipkow@4361
  2131
* HOL/Arithmetic:
nipkow@4361
  2132
  - `pred n' is automatically converted to `n-1'.
nipkow@4361
  2133
    Users are strongly encouraged not to use `pred' any longer,
nipkow@4361
  2134
    because it will disappear altogether at some point.
nipkow@4361
  2135
  - Users are strongly encouraged to write "0 < n" rather than
nipkow@4361
  2136
    "n ~= 0". Theorems and proof tools have been modified towards this
nipkow@4361
  2137
    `standard'.
nipkow@4357
  2138
nipkow@4502
  2139
* HOL/Lists:
nipkow@4502
  2140
  the function "set_of_list" has been renamed "set" (and its theorems too);
nipkow@4502
  2141
  the function "nth" now takes its arguments in the reverse order and
nipkow@4502
  2142
  has acquired the infix notation "!" as in "xs!n".
paulson@3570
  2143
paulson@4154
  2144
* HOL/Set: UNIV is now a constant and is no longer translated to Compl{};
paulson@4154
  2145
paulson@4154
  2146
* HOL/Set: The operator (UN x.B x) now abbreviates (UN x:UNIV. B x) and its
paulson@4154
  2147
  specialist theorems (like UN1_I) are gone.  Similarly for (INT x.B x);
paulson@4154
  2148
wenzelm@4575
  2149
* HOL/record: extensible records with schematic structural subtyping
wenzelm@4575
  2150
(single inheritance); EXPERIMENTAL version demonstrating the encoding,
wenzelm@4575
  2151
still lacks various theorems and concrete record syntax;
wenzelm@4575
  2152
wenzelm@4125
  2153
paulson@3715
  2154
*** HOLCF ***
wenzelm@3535
  2155
wenzelm@4125
  2156
* removed "axioms" and "generated by" sections;
wenzelm@4125
  2157
oheimb@4123
  2158
* replaced "ops" section by extended "consts" section, which is capable of
wenzelm@4125
  2159
  handling the continuous function space "->" directly;
wenzelm@4125
  2160
wenzelm@4125
  2161
* domain package:
wenzelm@4125
  2162
  . proves theorems immediately and stores them in the theory,
wenzelm@4125
  2163
  . creates hierachical name space,
wenzelm@4125
  2164
  . now uses normal mixfix annotations (instead of cinfix...),
wenzelm@4125
  2165
  . minor changes to some names and values (for consistency),
wenzelm@4125
  2166
  . e.g. cases -> casedist, dists_eq -> dist_eqs, [take_lemma] -> take_lemmas,
wenzelm@4125
  2167
  . separator between mutual domain defs: changed "," to "and",
wenzelm@4125
  2168
  . improved handling of sort constraints;  now they have to
wenzelm@4125
  2169
    appear on the left-hand side of the equations only;
oheimb@4123
  2170
oheimb@4123
  2171
* fixed LAM <x,y,zs>.b syntax;
wenzelm@3567
  2172
wenzelm@3744
  2173
* added extended adm_tac to simplifier in HOLCF -- can now discharge
wenzelm@3744
  2174
adm (%x. P (t x)), where P is chainfinite and t continuous;
wenzelm@3579
  2175
wenzelm@3579
  2176
paulson@3719
  2177
*** FOL and ZF ***
paulson@3719
  2178
wenzelm@5726
  2179
* FOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  2180
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
  2181
wenzelm@3744
  2182
* qed_spec_mp, qed_goal_spec_mp, qed_goalw_spec_mp are available, as
wenzelm@3744
  2183
in HOL, they strip ALL and --> from proved theorems;
wenzelm@3744
  2184
paulson@3719
  2185
wenzelm@3579
  2186
wenzelm@3006
  2187
New in Isabelle94-8 (May 1997)
wenzelm@3006
  2188
------------------------------
wenzelm@2654
  2189
paulson@3002
  2190
*** General Changes ***
paulson@3002
  2191
paulson@3002
  2192
* new utilities to build / run / maintain Isabelle etc. (in parts
paulson@3002
  2193
still somewhat experimental); old Makefiles etc. still functional;
wenzelm@2971
  2194
wenzelm@3205
  2195
* new 'Isabelle System Manual';
wenzelm@3205
  2196
wenzelm@2825
  2197
* INSTALL text, together with ./configure and ./build scripts;
wenzelm@2773
  2198
wenzelm@3006
  2199
* reimplemented type inference for greater efficiency, better error
wenzelm@3006
  2200
messages and clean internal interface;
paulson@3002
  2201
paulson@3002
  2202
* prlim command for dealing with lots of subgoals (an easier way of
paulson@3002
  2203
setting goals_limit);
paulson@3002
  2204
wenzelm@3006
  2205
wenzelm@3006
  2206
*** Syntax ***
paulson@3002
  2207
wenzelm@3116
  2208
* supports alternative (named) syntax tables (parser and pretty
wenzelm@3116
  2209
printer); internal interface is provided by add_modesyntax(_i);
wenzelm@3116
  2210
paulson@3002
  2211
* Pure, FOL, ZF, HOL, HOLCF now support symbolic input and output; to
paulson@3002
  2212
be used in conjunction with the Isabelle symbol font; uses the
paulson@3002
  2213
"symbols" syntax table;
paulson@3002
  2214
wenzelm@2705
  2215
* added token_translation interface (may translate name tokens in
wenzelm@2756
  2216
arbitrary ways, dependent on their type (free, bound, tfree, ...) and
wenzelm@3116
  2217
the current print_mode); IMPORTANT: user print translation functions
wenzelm@3116
  2218
are responsible for marking newly introduced bounds
wenzelm@3116
  2219
(Syntax.mark_boundT);
wenzelm@2705
  2220
wenzelm@2730
  2221
* token translations for modes "xterm" and "xterm_color" that display
wenzelm@3006
  2222
names in bold, underline etc. or colors (which requires a color
wenzelm@3006
  2223
version of xterm);
wenzelm@2730
  2224
paulson@3002
  2225
* infixes may now be declared with names independent of their syntax;
paulson@3002
  2226
paulson@3002
  2227
* added typed_print_translation (like print_translation, but may
paulson@3002
  2228
access type of constant);
paulson@3002
  2229
wenzelm@3006
  2230
paulson@3002
  2231
*** Classical Reasoner ***
paulson@3002
  2232
paulson@3002
  2233
Blast_tac: a new tactic!  It is often more powerful than fast_tac, but has
paulson@3002
  2234
some limitations.  Blast_tac...
paulson@3002
  2235
  + ignores addss, addbefore, addafter; this restriction is intrinsic
paulson@3002
  2236
  + ignores elimination rules that don't have the correct format
wenzelm@5726
  2237
        (the conclusion MUST be a formula variable)
paulson@3002
  2238
  + ignores types, which can make HOL proofs fail
paulson@3002
  2239
  + rules must not require higher-order unification, e.g. apply_type in ZF
paulson@3002
  2240
    [message "Function Var's argument not a bound variable" relates to this]
paulson@3002
  2241
  + its proof strategy is more general but can actually be slower
paulson@3002
  2242
wenzelm@3107
  2243
* substitution with equality assumptions no longer permutes other
wenzelm@3107
  2244
assumptions;
paulson@3002
  2245
paulson@3002
  2246
* minor changes in semantics of addafter (now called addaltern); renamed
paulson@3002
  2247
setwrapper to setWrapper and compwrapper to compWrapper; added safe wrapper
wenzelm@3107
  2248
(and access functions for it);
paulson@3002
  2249
wenzelm@5726
  2250
* improved combination of classical reasoner and simplifier:
oheimb@3317
  2251
  + functions for handling clasimpsets
oheimb@3317
  2252
  + improvement of addss: now the simplifier is called _after_ the
oheimb@3317
  2253
    safe steps.
oheimb@3317
  2254
  + safe variant of addss called addSss: uses safe simplifications
wenzelm@5726
  2255
    _during_ the safe steps. It is more complete as it allows multiple
oheimb@3317
  2256
    instantiations of unknowns (e.g. with slow_tac).
wenzelm@3006
  2257
paulson@3002
  2258
*** Simplifier ***
paulson@3002
  2259
wenzelm@3006
  2260
* added interface for simplification procedures (functions that
wenzelm@3006
  2261
produce *proven* rewrite rules on the fly, depending on current
wenzelm@3006
  2262
redex);
wenzelm@3006
  2263
wenzelm@3006
  2264
* ordering on terms as parameter (used for ordered rewriting);
wenzelm@3006
  2265
wenzelm@3107
  2266
* new functions delcongs, deleqcongs, and Delcongs. richer rep_ss;
paulson@3002
  2267
paulson@3002
  2268
* the solver is now split into a safe and an unsafe part.
paulson@3002
  2269
This should be invisible for the normal user, except that the
paulson@3002
  2270
functions setsolver and addsolver have been renamed to setSolver and
wenzelm@3107
  2271
addSolver; added safe_asm_full_simp_tac;
paulson@3002
  2272
paulson@3002
  2273
paulson@3002
  2274
*** HOL ***
paulson@3002
  2275
nipkow@3042
  2276
* a generic induction tactic `induct_tac' which works for all datatypes and
wenzelm@3107
  2277
also for type `nat';
nipkow@3042
  2278
nipkow@3316
  2279
* a generic case distinction tactic `exhaust_tac' which works for all
nipkow@3316
  2280
datatypes and also for type `nat';
nipkow@3316
  2281
nipkow@3316
  2282
* each datatype comes with a function `size';
nipkow@3316
  2283
paulson@3002
  2284
* patterns in case expressions allow tuple patterns as arguments to
wenzelm@3107
  2285
constructors, for example `case x of [] => ... | (x,y,z)#ps => ...';
paulson@3002
  2286
paulson@3002
  2287
* primrec now also works with type nat;
paulson@3002
  2288
paulson@3338
  2289
* recdef: a new declaration form, allows general recursive functions to be
paulson@3338
  2290
defined in theory files.  See HOL/ex/Fib, HOL/ex/Primes, HOL/Subst/Unify.
paulson@3338
  2291
paulson@3002
  2292
* the constant for negation has been renamed from "not" to "Not" to
wenzelm@3107
  2293
harmonize with FOL, ZF, LK, etc.;
paulson@3002
  2294
wenzelm@3107
  2295
* HOL/ex/LFilter theory of a corecursive "filter" functional for
wenzelm@3107
  2296
infinite lists;
paulson@3002
  2297
wenzelm@3227
  2298
* HOL/Modelcheck demonstrates invocation of model checker oracle;
wenzelm@3227
  2299
paulson@3002
  2300
* HOL/ex/Ring.thy declares cring_simp, which solves equational
paulson@3002
  2301
problems in commutative rings, using axiomatic type classes for + and *;
paulson@3002
  2302
paulson@3002
  2303
* more examples in HOL/MiniML and HOL/Auth;
paulson@3002
  2304
paulson@3002
  2305
* more default rewrite rules for quantifiers, union/intersection;
paulson@3002
  2306
nipkow@3321
  2307
* a new constant `arbitrary == @x.False';
nipkow@3321
  2308
wenzelm@3107
  2309
* HOLCF/IOA replaces old HOL/IOA;
wenzelm@3107
  2310
wenzelm@5726
  2311
* HOLCF changes: derived all rules and arities
wenzelm@5726
  2312
  + axiomatic type classes instead of classes
slotosch@2653
  2313
  + typedef instead of faking type definitions
paulson@2747
  2314
  + eliminated the internal constants less_fun, less_cfun, UU_fun, UU_cfun etc.
wenzelm@2730
  2315
  + new axclasses cpo, chfin, flat with flat < chfin < pcpo < cpo < po
slotosch@2653
  2316
  + eliminated the types void, one, tr
slotosch@2653
  2317
  + use unit lift and bool lift (with translations) instead of one and tr
slotosch@2653
  2318
  + eliminated blift from Lift3.thy (use Def instead of blift)
wenzelm@3107
  2319
  all eliminated rules are derived as theorems --> no visible changes ;
oheimb@2649
  2320
wenzelm@3006
  2321
paulson@3002
  2322
*** ZF ***
wenzelm@2553
  2323
paulson@2865
  2324
* ZF now has Fast_tac, Simp_tac and Auto_tac.  Union_iff is a now a default
paulson@2865
  2325
rewrite rule; this may affect some proofs.  eq_cs is gone but can be put back
paulson@2865
  2326
as ZF_cs addSIs [equalityI];
wenzelm@2553
  2327
wenzelm@2554
  2328
wenzelm@2732
  2329
wenzelm@2553
  2330
New in Isabelle94-7 (November 96)
wenzelm@2553
  2331
---------------------------------
wenzelm@2553
  2332
wenzelm@2553
  2333
* allowing negative levels (as offsets) in prlev and choplev;
wenzelm@2553
  2334
wenzelm@2554
  2335
* super-linear speedup for large simplifications;
wenzelm@2554
  2336
wenzelm@2554
  2337
* FOL, ZF and HOL now use miniscoping: rewriting pushes
wenzelm@2554
  2338
quantifications in as far as possible (COULD MAKE EXISTING PROOFS
wenzelm@2554
  2339
FAIL); can suppress it using the command Delsimps (ex_simps @
wenzelm@2554
  2340
all_simps); De Morgan laws are also now included, by default;
wenzelm@2554
  2341
wenzelm@2554
  2342
* improved printing of ==>  :  ~:
wenzelm@2554
  2343
wenzelm@2554
  2344
* new object-logic "Sequents" adds linear logic, while replacing LK
wenzelm@2554
  2345
and Modal (thanks to Sara Kalvala);
wenzelm@2554
  2346
wenzelm@2554
  2347
* HOL/Auth: correctness proofs for authentication protocols;
wenzelm@2554
  2348
wenzelm@2554
  2349
* HOL: new auto_tac combines rewriting and classical reasoning (many
wenzelm@2554
  2350
examples on HOL/Auth);
wenzelm@2554
  2351
wenzelm@2554
  2352
* HOL: new command AddIffs for declaring theorems of the form P=Q to
wenzelm@2554
  2353
the rewriter and classical reasoner simultaneously;
wenzelm@2554
  2354
wenzelm@2554
  2355
* function uresult no longer returns theorems in "standard" format;
wenzelm@2554
  2356
regain previous version by: val uresult = standard o uresult;
wenzelm@2554
  2357
wenzelm@2554
  2358
wenzelm@2554
  2359
wenzelm@2554
  2360
New in Isabelle94-6
wenzelm@2554
  2361
-------------------
wenzelm@2554
  2362
wenzelm@2554
  2363
* oracles -- these establish an interface between Isabelle and trusted
wenzelm@2554
  2364
external reasoners, which may deliver results as theorems;
wenzelm@2554
  2365
wenzelm@2554
  2366
* proof objects (in particular record all uses of oracles);
wenzelm@2554
  2367
wenzelm@2554
  2368
* Simp_tac, Fast_tac, etc. that refer to implicit simpset / claset;
wenzelm@2554
  2369
wenzelm@2554
  2370
* "constdefs" section in theory files;
wenzelm@2554
  2371
wenzelm@2554
  2372
* "primrec" section (HOL) no longer requires names;
wenzelm@2554
  2373
wenzelm@2554
  2374
* internal type "tactic" now simply "thm -> thm Sequence.seq";
wenzelm@2554
  2375
wenzelm@2554
  2376
wenzelm@2554
  2377
wenzelm@2554
  2378
New in Isabelle94-5
wenzelm@2554
  2379
-------------------
wenzelm@2554
  2380
wenzelm@2554
  2381
* reduced space requirements;
wenzelm@2554
  2382
wenzelm@2554
  2383
* automatic HTML generation from theories;
wenzelm@2554
  2384
wenzelm@2554
  2385
* theory files no longer require "..." (quotes) around most types;
wenzelm@2554
  2386
wenzelm@2554
  2387
* new examples, including two proofs of the Church-Rosser theorem;
wenzelm@2554
  2388
wenzelm@2554
  2389
* non-curried (1994) version of HOL is no longer distributed;
wenzelm@2554
  2390
wenzelm@2553
  2391
paulson@2557
  2392
paulson@2557
  2393
New in Isabelle94-4
paulson@2557
  2394
-------------------
paulson@2557
  2395
paulson@2747
  2396
* greatly reduced space requirements;
paulson@2557
  2397
paulson@2557
  2398
* theory files (.thy) no longer require \...\ escapes at line breaks;
paulson@2557
  2399
wenzelm@5726
  2400
* searchable theorem database (see the section "Retrieving theorems" on
paulson@2557
  2401
page 8 of the Reference Manual);
paulson@2557
  2402
paulson@2557
  2403
* new examples, including Grabczewski's monumental case study of the
paulson@2557
  2404
Axiom of Choice;
paulson@2557
  2405
paulson@2557
  2406
* The previous version of HOL renamed to Old_HOL;
paulson@2557
  2407
wenzelm@5726
  2408
* The new version of HOL (previously called CHOL) uses a curried syntax
paulson@2557
  2409
for functions.  Application looks like f a b instead of f(a,b);
paulson@2557
  2410
paulson@2557
  2411
* Mutually recursive inductive definitions finally work in HOL;
paulson@2557
  2412
paulson@2557
  2413
* In ZF, pattern-matching on tuples is now available in all abstractions and
paulson@2557
  2414
translates to the operator "split";
paulson@2557
  2415
paulson@2557
  2416
paulson@2557
  2417
paulson@2557
  2418
New in Isabelle94-3
paulson@2557
  2419
-------------------
paulson@2557
  2420
wenzelm@5726
  2421
* new infix operator, addss, allowing the classical reasoner to
paulson@2557
  2422
perform simplification at each step of its search.  Example:
wenzelm@5726
  2423
        fast_tac (cs addss ss)
paulson@2557
  2424
wenzelm@5726
  2425
* a new logic, CHOL, the same as HOL, but with a curried syntax
wenzelm@5726
  2426
for functions.  Application looks like f a b instead of f(a,b).  Also pairs
paulson@2557
  2427
look like (a,b) instead of <a,b>;
paulson@2557
  2428
paulson@2557
  2429
* PLEASE NOTE: CHOL will eventually replace HOL!
paulson@2557
  2430
paulson@2557
  2431
* In CHOL, pattern-matching on tuples is now available in all abstractions.
paulson@2557
  2432
It translates to the operator "split".  A new theory of integers is available;
paulson@2557
  2433
paulson@2557
  2434
* In ZF, integer numerals now denote two's-complement binary integers.
paulson@2557
  2435
Arithmetic operations can be performed by rewriting.  See ZF/ex/Bin.ML;
paulson@2557
  2436
wenzelm@5726
  2437
* Many new examples: I/O automata, Church-Rosser theorem, equivalents
paulson@2557
  2438
of the Axiom of Choice;
paulson@2557
  2439
paulson@2557
  2440
paulson@2557
  2441
paulson@2557
  2442
New in Isabelle94-2
paulson@2557
  2443
-------------------
paulson@2557
  2444
wenzelm@5726
  2445
* Significantly faster resolution;
paulson@2557
  2446
paulson@2557
  2447
* the different sections in a .thy file can now be mixed and repeated
paulson@2557
  2448
freely;
paulson@2557
  2449
paulson@2557
  2450
* Database of theorems for FOL, HOL and ZF.  New
paulson@2557
  2451
commands including qed, qed_goal and bind_thm store theorems in the database.
paulson@2557
  2452
paulson@2557
  2453
* Simple database queries: return a named theorem (get_thm) or all theorems of
paulson@2557
  2454
a given theory (thms_of), or find out what theory a theorem was proved in
paulson@2557
  2455
(theory_of_thm);
paulson@2557
  2456
paulson@2557
  2457
* Bugs fixed in the inductive definition and datatype packages;
paulson@2557
  2458
paulson@2557
  2459
* The classical reasoner provides deepen_tac and depth_tac, making FOL_dup_cs
paulson@2557
  2460
and HOL_dup_cs obsolete;
paulson@2557
  2461
paulson@2557
  2462
* Syntactic ambiguities caused by the new treatment of syntax in Isabelle94-1
paulson@2557
  2463
have been removed;
paulson@2557
  2464
paulson@2557
  2465
* Simpler definition of function space in ZF;
paulson@2557
  2466
paulson@2557
  2467
* new results about cardinal and ordinal arithmetic in ZF;
paulson@2557
  2468
paulson@2557
  2469
* 'subtype' facility in HOL for introducing new types as subsets of existing
paulson@2557
  2470
types;
paulson@2557
  2471
paulson@2557
  2472
wenzelm@2553
  2473
$Id$