NEWS
author berghofe
Tue Oct 01 15:03:28 2002 +0200 (2002-10-01)
changeset 13618 12290bdce807
parent 13613 531f1f524848
child 13643 c82298745c20
permissions -rw-r--r--
Added some comments on new simplifier.
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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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* Provers/simplifier:
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  - Completely reimplemented 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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    -- Asm_full_simp_tac sometimes diverges where the old version did
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       not, e.g. invoking Asm_full_simp_tac 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 Asm_lr_simp_tac (or "simp (asm_lr)" in Isabelle/Isar) instead
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      often solves this kind of problem.
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    -- Tactics combining classical reasoner and simplification (such
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       as auto) are also affected by this change, because many of them
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       rely on Asm_full_simp_tac. They may sometimes diverge as well
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       or yield a different numbers of subgoals. Try to use e.g. force,
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       fastsimp, or safe instead of auto in case of problems. Sometimes
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       subsequent calls to the classical reasoner will fail because a
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       preceeding call to the simplifier too eagerly simplified the
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       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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* 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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* 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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* 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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* arith(_tac) now produces a counter example if it cannot prove a theorem.
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  In ProofGeneral the counter example appears in the trace buffer.
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* arith(_tac) does now know about div k and mod k where k is a numeral
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of type nat or int. It can solve simple goals like
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  "0 < n ==> n div 2 < (n::nat)"
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but fails if divisibility plays a role like in
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  "n div 2 + (n+1) div 2 = (n::nat)"
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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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* 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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* GroupTheory: converted to Isar theories, using locales with implicit structures;
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* Real/HahnBanach: updated and adapted to locales;
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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: many 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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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
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qualified by the locale name);
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* Pure: theory goals may now be specified in ``long'' form, with
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ad-hoc contexts consisting of arbitrary locale elements. for example
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``lemma foo: fixes x assumes "A x" shows "B x"'' (local syntax and
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definitions may be given, too); the result is a meta-level rule with
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the context elements being discharged in the obvious way;
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* Pure: new proof command 'using' allows to augment currently used
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facts after a goal statement ('using' is syntactically analogous to
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'apply', but acts on the goal's facts only); this allows chained facts
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to be separated into parts given before and after a claim, as in
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``from a and b have C using d and e <proof>'';
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* Pure: renamed "antecedent" case to "rule_context";
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* Pure: new 'judgment' command records explicit information about the
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object-logic embedding (used by several tools internally); no longer
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use hard-wired "Trueprop";
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* Pure: added 'corollary' command;
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* Pure: fixed 'token_translation' command;
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* Pure: removed obsolete 'exported' attribute;
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* Pure: dummy pattern "_" in is/let is now automatically lifted over
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bound variables: "ALL x. P x --> Q x" (is "ALL x. _ --> ?C x")
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supersedes more cumbersome ... (is "ALL x. _ x --> ?C x");
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* Pure: method 'atomize' presents local goal premises as object-level
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statements (atomic meta-level propositions); setup controlled via
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rewrite rules declarations of 'atomize' attribute; example
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application: 'induct' method with proper rule statements in improper
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proof *scripts*;
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* Pure: emulation of instantiation tactics (rule_tac, cut_tac, etc.)
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now consider the syntactic context of assumptions, giving a better
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chance to get type-inference of the arguments right (this is
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especially important for locales);
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* Pure: "sorry" no longer requires quick_and_dirty in interactive
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mode;
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* Pure/obtain: the formal conclusion "thesis", being marked as
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``internal'', may no longer be reference directly in the text;
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potential INCOMPATIBILITY, may need to use "?thesis" in rare
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situations;
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* Pure: generic 'sym' attribute which declares a rule both as pure
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'elim?' and for the 'symmetric' operation;
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* Pure: marginal comments ``--'' may now occur just anywhere in the
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text; the fixed correlation with particular command syntax has been
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discontinued;
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* Pure: new method 'rules' is particularly well-suited for proof
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search in intuitionistic logic; a bit slower than 'blast' or 'fast',
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but often produces more compact proof terms with less detours;
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* Pure/Provers/classical: simplified integration with pure rule
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attributes and methods; the classical "intro?/elim?/dest?"
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declarations coincide with the pure ones; the "rule" method no longer
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includes classically swapped intros; "intro" and "elim" methods no
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longer pick rules from the context; also got rid of ML declarations
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AddXIs/AddXEs/AddXDs; all of this has some potential for
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INCOMPATIBILITY;
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* Provers/classical: attribute 'swapped' produces classical inversions
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of introduction rules;
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* Provers/simplifier: 'simplified' attribute may refer to explicit
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rules instead of full simplifier context; 'iff' attribute handles
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conditional rules;
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* HOL: 'typedef' now allows alternative names for Rep/Abs morphisms;
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* HOL: 'recdef' now fails on unfinished automated proofs, use
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"(permissive)" option to recover old behavior;
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* HOL: 'inductive' no longer features separate (collective) attributes
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for 'intros' (was found too confusing);
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* HOL: properly declared induction rules less_induct and
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wf_induct_rule;
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*** HOL ***
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* HOL: moved over to sane numeral syntax; the new policy is as
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follows:
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  - 0 and 1 are polymorphic constants, which are defined on any
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  numeric type (nat, int, real etc.);
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  - 2, 3, 4, ... and -1, -2, -3, ... are polymorphic numerals, based
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  binary representation internally;
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  - type nat has special constructor Suc, and generally prefers Suc 0
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  over 1::nat and Suc (Suc 0) over 2::nat;
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This change may cause significant problems of INCOMPATIBILITY; here
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are some hints on converting existing sources:
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  - due to the new "num" token, "-0" and "-1" etc. are now atomic
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  entities, so expressions involving "-" (unary or binary minus) need
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  to be spaced properly;
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  - existing occurrences of "1" may need to be constraint "1::nat" or
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  even replaced by Suc 0; similar for old "2";
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  - replace "#nnn" by "nnn", and "#-nnn" by "-nnn";
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  - remove all special provisions on numerals in proofs;
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* HOL: simp rules nat_number expand numerals on nat to Suc/0
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representation (depends on bin_arith_simps in the default context);
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* HOL: symbolic syntax for x^2 (numeral 2);
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* HOL: the class of all HOL types is now called "type" rather than
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"term"; INCOMPATIBILITY, need to adapt references to this type class
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in axclass/classes, instance/arities, and (usually rare) occurrences
wenzelm@12335
   352
in typings (of consts etc.); internally the class is called
wenzelm@12335
   353
"HOL.type", ML programs should refer to HOLogic.typeS;
wenzelm@12335
   354
wenzelm@12280
   355
* HOL/record package improvements:
wenzelm@12280
   356
  - new derived operations "fields" to build a partial record section,
wenzelm@12280
   357
    "extend" to promote a fixed record to a record scheme, and
wenzelm@12280
   358
    "truncate" for the reverse; cf. theorems "xxx.defs", which are *not*
wenzelm@12280
   359
    declared as simp by default;
wenzelm@12587
   360
  - shared operations ("more", "fields", etc.) now need to be always
wenzelm@12587
   361
    qualified) --- potential INCOMPATIBILITY;
wenzelm@12280
   362
  - removed "make_scheme" operations (use "make" with "extend") --
wenzelm@12280
   363
    INCOMPATIBILITY;
wenzelm@11937
   364
  - removed "more" class (simply use "term") -- INCOMPATIBILITY;
wenzelm@12253
   365
  - provides cases/induct rules for use with corresponding Isar
wenzelm@12253
   366
    methods (for concrete records, record schemes, concrete more
wenzelm@12280
   367
    parts, and schematic more parts -- in that order);
wenzelm@11930
   368
  - internal definitions directly based on a light-weight abstract
wenzelm@11930
   369
    theory of product types over typedef rather than datatype;
wenzelm@11930
   370
berghofe@13023
   371
* HOL: generic code generator for generating executable ML code from
berghofe@13023
   372
specifications; specific support for HOL constructs such as inductive
berghofe@13023
   373
datatypes and sets, as well as recursive functions; can be invoked
berghofe@13023
   374
via 'generate_code' theory section;
berghofe@13023
   375
wenzelm@11933
   376
* HOL: canonical cases/induct rules for n-tuples (n = 3..7);
wenzelm@11933
   377
wenzelm@11802
   378
* HOL: concrete setsum syntax "\<Sum>i:A. b" == "setsum (%i. b) A"
wenzelm@11802
   379
(beware of argument permutation!);
wenzelm@11802
   380
wenzelm@11657
   381
* HOL: linorder_less_split superseded by linorder_cases;
wenzelm@11657
   382
wenzelm@12917
   383
* HOL/List: "nodups" renamed to "distinct";
nipkow@12889
   384
wenzelm@11633
   385
* HOL: added "The" definite description operator; move Hilbert's "Eps"
wenzelm@11633
   386
to peripheral theory "Hilbert_Choice";
wenzelm@11437
   387
wenzelm@11572
   388
* HOL: made split_all_tac safe; EXISTING PROOFS MAY FAIL OR LOOP, so
wenzelm@11572
   389
in this (rare) case use:
wenzelm@11572
   390
wenzelm@11572
   391
  delSWrapper "split_all_tac"
wenzelm@11572
   392
  addSbefore ("unsafe_split_all_tac", unsafe_split_all_tac)
wenzelm@11572
   393
wenzelm@11572
   394
* HOL: added safe wrapper "split_conv_tac" to claset; EXISTING PROOFS
wenzelm@11474
   395
MAY FAIL;
nipkow@11361
   396
wenzelm@11572
   397
* HOL: introduced f^n = f o ... o f; warning: due to the limits of
wenzelm@11572
   398
Isabelle's type classes, ^ on functions and relations has too general
wenzelm@11572
   399
a domain, namely ('a * 'b) set and 'a => 'b; this means that it may be
wenzelm@11572
   400
necessary to attach explicit type constraints;
nipkow@11307
   401
wenzelm@12917
   402
* HOL/Relation: the prefix name of the infix "O" has been changed from
wenzelm@12917
   403
"comp" to "rel_comp"; INCOMPATIBILITY: a few theorems have been
wenzelm@12917
   404
renamed accordingly (eg "compI" -> "rel_compI").
nipkow@12489
   405
wenzelm@11487
   406
* HOL: syntax translations now work properly with numerals and records
wenzelm@11487
   407
expressions;
wenzelm@11474
   408
wenzelm@12457
   409
* HOL: bounded abstraction now uses syntax "%" / "\<lambda>" instead
wenzelm@12457
   410
of "lam" -- INCOMPATIBILITY;
wenzelm@11474
   411
wenzelm@11933
   412
* HOL: got rid of some global declarations (potential INCOMPATIBILITY
wenzelm@11933
   413
for ML tools): const "()" renamed "Product_Type.Unity", type "unit"
wenzelm@11933
   414
renamed "Product_Type.unit";
wenzelm@11611
   415
nipkow@12564
   416
* HOL: renamed rtrancl_into_rtrancl2 to converse_rtrancl_into_rtrancl
nipkow@12564
   417
wenzelm@12924
   418
* HOL: removed obsolete theorem "optionE" (use "option.exhaust", or
wenzelm@12924
   419
the "cases" method);
wenzelm@12924
   420
wenzelm@12597
   421
* HOL/GroupTheory: group theory examples including Sylow's theorem (by
wenzelm@12597
   422
Florian Kammüller);
wenzelm@12597
   423
wenzelm@12608
   424
* HOL/IMP: updated and converted to new-style theory format; several
wenzelm@12608
   425
parts turned into readable document, with proper Isar proof texts and
wenzelm@12608
   426
some explanations (by Gerwin Klein);
wenzelm@12597
   427
wenzelm@12734
   428
* HOL-Real: added Complex_Numbers (by Gertrud Bauer);
wenzelm@12734
   429
wenzelm@12690
   430
* HOL-Hyperreal is now a logic image;
wenzelm@12690
   431
wenzelm@11611
   432
wenzelm@12022
   433
*** HOLCF ***
wenzelm@12022
   434
wenzelm@12622
   435
* Isar: consts/constdefs supports mixfix syntax for continuous
wenzelm@12622
   436
operations;
wenzelm@12622
   437
wenzelm@12622
   438
* Isar: domain package adapted to new-style theory format, e.g. see
wenzelm@12622
   439
HOLCF/ex/Dnat.thy;
wenzelm@12622
   440
wenzelm@12622
   441
* theory Lift: proper use of rep_datatype lift instead of ML hacks --
wenzelm@12280
   442
potential INCOMPATIBILITY; now use plain induct_tac instead of former
wenzelm@12280
   443
lift.induct_tac, always use UU instead of Undef;
wenzelm@12022
   444
wenzelm@12597
   445
* HOLCF/IMP: updated and converted to new-style theory;
wenzelm@12597
   446
wenzelm@12022
   447
wenzelm@11474
   448
*** ZF ***
wenzelm@11474
   449
wenzelm@12622
   450
* Isar: proper integration of logic-specific tools and packages,
wenzelm@12622
   451
including theory commands '(co)inductive', '(co)datatype',
wenzelm@12622
   452
'rep_datatype', 'inductive_cases', as well as methods 'ind_cases',
wenzelm@12622
   453
'induct_tac', 'case_tac', and 'typecheck' (with attribute 'TC');
wenzelm@12622
   454
wenzelm@12622
   455
* theory Main no longer includes AC; for the Axiom of Choice, base
wenzelm@12622
   456
your theory on Main_ZFC;
wenzelm@12622
   457
wenzelm@12622
   458
* the integer library now covers quotients and remainders, with many
wenzelm@12622
   459
laws relating division to addition, multiplication, etc.;
paulson@12563
   460
wenzelm@12280
   461
* ZF/UNITY: Chandy and Misra's UNITY is now available in ZF, giving a
wenzelm@12280
   462
typeless version of the formalism;
wenzelm@12280
   463
wenzelm@13025
   464
* ZF/AC, Coind, IMP, Resid: updated and converted to new-style theory
wenzelm@13025
   465
format;
wenzelm@12608
   466
wenzelm@12280
   467
* ZF/Induct: new directory for examples of inductive definitions,
wenzelm@12608
   468
including theory Multiset for multiset orderings; converted to
wenzelm@12608
   469
new-style theory format;
wenzelm@12177
   470
wenzelm@13025
   471
* ZF: many new theorems about lists, ordinals, etc.;
paulson@12850
   472
wenzelm@11474
   473
wenzelm@11474
   474
*** General ***
wenzelm@11474
   475
wenzelm@12280
   476
* Pure/kernel: meta-level proof terms (by Stefan Berghofer); reference
wenzelm@12280
   477
variable proof controls level of detail: 0 = no proofs (only oracle
wenzelm@12280
   478
dependencies), 1 = lemma dependencies, 2 = compact proof terms; see
wenzelm@12280
   479
also ref manual for further ML interfaces;
wenzelm@12280
   480
wenzelm@12280
   481
* Pure/axclass: removed obsolete ML interface
wenzelm@12280
   482
goal_subclass/goal_arity;
wenzelm@12280
   483
wenzelm@12280
   484
* Pure/syntax: new token syntax "num" for plain numerals (without "#"
wenzelm@12280
   485
of "xnum"); potential INCOMPATIBILITY, since -0, -1 etc. are now
wenzelm@12280
   486
separate tokens, so expressions involving minus need to be spaced
wenzelm@12280
   487
properly;
wenzelm@12280
   488
wenzelm@12312
   489
* Pure/syntax: support non-oriented infixes, using keyword "infix"
wenzelm@12312
   490
rather than "infixl" or "infixr";
wenzelm@12312
   491
wenzelm@12312
   492
* Pure/syntax: concrete syntax for dummy type variables admits genuine
wenzelm@12312
   493
sort constraint specifications in type inference; e.g. "x::_::foo"
wenzelm@12312
   494
ensures that the type of "x" is of sort "foo" (but not necessarily a
wenzelm@12312
   495
type variable);
wenzelm@12280
   496
wenzelm@12280
   497
* Pure/syntax: print modes "type_brackets" and "no_type_brackets"
wenzelm@12280
   498
control output of nested => (types); the default behavior is
wenzelm@12280
   499
"type_brackets";
wenzelm@12280
   500
wenzelm@12280
   501
* Pure/syntax: builtin parse translation for "_constify" turns valued
wenzelm@11817
   502
tokens into AST constants;
wenzelm@11474
   503
wenzelm@12280
   504
* Pure/syntax: prefer later declarations of translations and print
wenzelm@12280
   505
translation functions; potential INCOMPATIBILITY: need to reverse
wenzelm@12280
   506
multiple declarations for same syntax element constant;
wenzelm@12280
   507
wenzelm@12832
   508
* Pure/show_hyps reset by default (in accordance to existing Isar
wenzelm@12832
   509
practice);
wenzelm@12832
   510
wenzelm@12280
   511
* Provers/classical: renamed addaltern to addafter, addSaltern to
wenzelm@12280
   512
addSafter;
wenzelm@12280
   513
wenzelm@12280
   514
* Provers/clasimp: ``iff'' declarations now handle conditional rules
wenzelm@12280
   515
as well;
wenzelm@12253
   516
wenzelm@12538
   517
* system: tested support for MacOS X; should be able to get Isabelle +
wenzelm@12538
   518
Proof General to work in a plain Terminal after installing Poly/ML
wenzelm@12538
   519
(e.g. from the Isabelle distribution area) and GNU bash alone
wenzelm@12538
   520
(e.g. from http://www.apple.com); full X11, XEmacs and X-Symbol
wenzelm@12538
   521
support requires further installations, e.g. from
wenzelm@12538
   522
http://fink.sourceforge.net/);
wenzelm@12538
   523
wenzelm@12280
   524
* system: support Poly/ML 4.1.1 (able to manage larger heaps);
wenzelm@11551
   525
wenzelm@12753
   526
* system: reduced base memory usage by Poly/ML (approx. 20 MB instead
wenzelm@12753
   527
of 40 MB), cf. ML_OPTIONS;
wenzelm@12753
   528
wenzelm@11633
   529
* system: Proof General keywords specification is now part of the
wenzelm@11633
   530
Isabelle distribution (see etc/isar-keywords.el);
wenzelm@11633
   531
wenzelm@12728
   532
* system: support for persistent Proof General sessions (refrain from
wenzelm@12728
   533
outdating all loaded theories on startup); user may create writable
wenzelm@12728
   534
logic images like this: ``isabelle -q HOL Test'';
wenzelm@12597
   535
wenzelm@11551
   536
* system: smart selection of Isabelle process versus Isabelle
wenzelm@11572
   537
interface, accommodates case-insensitive file systems (e.g. HFS+); may
wenzelm@11572
   538
run both "isabelle" and "Isabelle" even if file names are badly
wenzelm@11572
   539
damaged (executable inspects the case of the first letter of its own
wenzelm@11572
   540
name); added separate "isabelle-process" and "isabelle-interface";
wenzelm@11551
   541
wenzelm@12472
   542
* system: refrain from any attempt at filtering input streams; no
wenzelm@12472
   543
longer support ``8bit'' encoding of old isabelle font, instead proper
wenzelm@12472
   544
iso-latin characters may now be used; the related isatools
wenzelm@12472
   545
"symbolinput" and "nonascii" have disappeared as well;
wenzelm@12472
   546
wenzelm@12472
   547
* system: removed old "xterm" interface (the print modes "xterm" and
wenzelm@12472
   548
"xterm_color" are still available for direct use in a suitable
wenzelm@12472
   549
terminal);
wenzelm@12472
   550
paulson@11314
   551
oheimb@11169
   552
wenzelm@11062
   553
New in Isabelle99-2 (February 2001)
wenzelm@11062
   554
-----------------------------------
wenzelm@11062
   555
nipkow@10224
   556
*** Overview of INCOMPATIBILITIES ***
nipkow@10224
   557
paulson@11241
   558
* HOL: please note that theories in the Library and elsewhere often use the
paulson@11241
   559
new-style (Isar) format; to refer to their theorems in an ML script you must
wenzelm@12622
   560
bind them to ML identifers by e.g.      val thm_name = thm "thm_name";
paulson@11241
   561
wenzelm@11043
   562
* HOL: inductive package no longer splits induction rule aggressively,
wenzelm@11043
   563
but only as far as specified by the introductions given; the old
oheimb@11130
   564
format may be recovered via ML function complete_split_rule or attribute
wenzelm@11043
   565
'split_rule (complete)';
wenzelm@11043
   566
wenzelm@10998
   567
* HOL: induct renamed to lfp_induct, lfp_Tarski to lfp_unfold,
wenzelm@10998
   568
gfp_Tarski to gfp_unfold;
nipkow@10224
   569
paulson@10288
   570
* HOL: contrapos, contrapos2 renamed to contrapos_nn, contrapos_pp;
paulson@10288
   571
wenzelm@10858
   572
* HOL: infix "dvd" now has priority 50 rather than 70 (because it is a
wenzelm@10858
   573
relation); infix "^^" has been renamed "``"; infix "``" has been
wenzelm@10858
   574
renamed "`"; "univalent" has been renamed "single_valued";
nipkow@10793
   575
wenzelm@10998
   576
* HOL/Real: "rinv" and "hrinv" replaced by overloaded "inverse"
wenzelm@10998
   577
operation;
wenzelm@10998
   578
nipkow@10868
   579
* HOLCF: infix "`" has been renamed "$"; the symbol syntax is \<cdot>;
nipkow@10856
   580
wenzelm@10391
   581
* Isar: 'obtain' no longer declares "that" fact as simp/intro;
wenzelm@10391
   582
wenzelm@10401
   583
* Isar/HOL: method 'induct' now handles non-atomic goals; as a
wenzelm@10401
   584
consequence, it is no longer monotonic wrt. the local goal context
wenzelm@10401
   585
(which is now passed through the inductive cases);
wenzelm@10401
   586
wenzelm@10976
   587
* Document preparation: renamed standard symbols \<ll> to \<lless> and
wenzelm@10976
   588
\<gg> to \<ggreater>;
wenzelm@10976
   589
nipkow@10224
   590
wenzelm@10245
   591
*** Document preparation ***
wenzelm@10245
   592
wenzelm@10858
   593
* \isabellestyle{NAME} selects version of Isabelle output (currently
wenzelm@10858
   594
available: are "it" for near math-mode best-style output, "sl" for
wenzelm@10858
   595
slanted text style, and "tt" for plain type-writer; if no
wenzelm@10858
   596
\isabellestyle command is given, output is according to slanted
wenzelm@10858
   597
type-writer);
wenzelm@10858
   598
wenzelm@10322
   599
* support sub/super scripts (for single symbols only), input syntax is
wenzelm@10322
   600
like this: "A\<^sup>*" or "A\<^sup>\<star>";
wenzelm@10322
   601
wenzelm@10858
   602
* some more standard symbols; see Appendix A of the system manual for
wenzelm@11062
   603
the complete list of symbols defined in isabellesym.sty;
wenzelm@10858
   604
wenzelm@10998
   605
* improved isabelle style files; more abstract symbol implementation
wenzelm@10998
   606
(should now use \isamath{...} and \isatext{...} in custom symbol
wenzelm@10998
   607
definitions);
wenzelm@10998
   608
wenzelm@10634
   609
* antiquotation @{goals} and @{subgoals} for output of *dynamic* goals
wenzelm@10634
   610
state; Note that presentation of goal states does not conform to
wenzelm@10634
   611
actual human-readable proof documents.  Please do not include goal
wenzelm@10634
   612
states into document output unless you really know what you are doing!
wenzelm@10322
   613
wenzelm@11062
   614
* proper indentation of antiquoted output with proportional LaTeX
wenzelm@11062
   615
fonts;
wenzelm@10862
   616
wenzelm@11050
   617
* no_document ML operator temporarily disables LaTeX document
wenzelm@11050
   618
generation;
wenzelm@11050
   619
wenzelm@11062
   620
* isatool unsymbolize tunes sources for plain ASCII communication;
wenzelm@11062
   621
wenzelm@10322
   622
wenzelm@10306
   623
*** Isar ***
wenzelm@10306
   624
wenzelm@10547
   625
* Pure: Isar now suffers initial goal statements to contain unbound
wenzelm@10547
   626
schematic variables (this does not conform to actual readable proof
wenzelm@10547
   627
documents, due to unpredictable outcome and non-compositional proof
wenzelm@10547
   628
checking); users who know what they are doing may use schematic goals
wenzelm@10547
   629
for Prolog-style synthesis of proven results;
wenzelm@10547
   630
wenzelm@10391
   631
* Pure: assumption method (an implicit finishing) now handles actual
wenzelm@10391
   632
rules as well;
wenzelm@10391
   633
wenzelm@10391
   634
* Pure: improved 'obtain' --- moved to Pure, insert "that" into
wenzelm@10391
   635
initial goal, declare "that" only as Pure intro (only for single
wenzelm@10391
   636
steps); the "that" rule assumption may now be involved in implicit
wenzelm@10391
   637
finishing, thus ".." becomes a feasible for trivial obtains;
wenzelm@10391
   638
wenzelm@10391
   639
* Pure: default proof step now includes 'intro_classes'; thus trivial
wenzelm@10391
   640
instance proofs may be performed by "..";
wenzelm@10391
   641
wenzelm@10391
   642
* Pure: ?thesis / ?this / "..." now work for pure meta-level
wenzelm@10391
   643
statements as well;
wenzelm@10306
   644
wenzelm@11097
   645
* Pure: more robust selection of calculational rules;
wenzelm@11097
   646
wenzelm@10858
   647
* Pure: the builtin notion of 'finished' goal now includes the ==-refl
wenzelm@10858
   648
rule (as well as the assumption rule);
wenzelm@10858
   649
wenzelm@10858
   650
* Pure: 'thm_deps' command visualizes dependencies of theorems and
wenzelm@10858
   651
lemmas, using the graph browser tool;
wenzelm@10858
   652
wenzelm@10944
   653
* Pure: predict failure of "show" in interactive mode;
wenzelm@10944
   654
wenzelm@11016
   655
* Pure: 'thms_containing' now takes actual terms as arguments;
wenzelm@11016
   656
wenzelm@10401
   657
* HOL: improved method 'induct' --- now handles non-atomic goals
wenzelm@10401
   658
(potential INCOMPATIBILITY); tuned error handling;
wenzelm@10401
   659
wenzelm@10557
   660
* HOL: cases and induct rules now provide explicit hints about the
wenzelm@10547
   661
number of facts to be consumed (0 for "type" and 1 for "set" rules);
wenzelm@10547
   662
any remaining facts are inserted into the goal verbatim;
wenzelm@10547
   663
wenzelm@10858
   664
* HOL: local contexts (aka cases) may now contain term bindings as
wenzelm@10858
   665
well; the 'cases' and 'induct' methods new provide a ?case binding for
wenzelm@10858
   666
the result to be shown in each case;
wenzelm@10858
   667
wenzelm@10770
   668
* HOL: added 'recdef_tc' command;
wenzelm@10770
   669
wenzelm@11016
   670
* isatool convert assists in eliminating legacy ML scripts;
wenzelm@11016
   671
wenzelm@10306
   672
wenzelm@10245
   673
*** HOL ***
wenzelm@10245
   674
wenzelm@10245
   675
* HOL/Library: a collection of generic theories to be used together
wenzelm@10245
   676
with main HOL; the theory loader path already includes this directory
wenzelm@10245
   677
by default; the following existing theories have been moved here:
wenzelm@10245
   678
HOL/Induct/Multiset, HOL/Induct/Acc (as Accessible_Part), HOL/While
wenzelm@10337
   679
(as While_Combinator), HOL/Lex/Prefix (as List_Prefix);
wenzelm@10245
   680
wenzelm@10966
   681
* HOL/Unix: "Some aspects of Unix file-system security", a typical
wenzelm@10966
   682
modelling and verification task performed in Isabelle/HOL +
wenzelm@10966
   683
Isabelle/Isar + Isabelle document preparation (by Markus Wenzel).
wenzelm@10966
   684
wenzelm@11094
   685
* HOL/Algebra: special summation operator SUM no longer exists, it has
wenzelm@11094
   686
been replaced by setsum; infix 'assoc' now has priority 50 (like
wenzelm@11094
   687
'dvd'); axiom 'one_not_zero' has been moved from axclass 'ring' to
wenzelm@11094
   688
'domain', this makes the theory consistent with mathematical
wenzelm@11094
   689
literature;
wenzelm@11094
   690
wenzelm@10514
   691
* HOL basics: added overloaded operations "inverse" and "divide"
wenzelm@10726
   692
(infix "/"), syntax for generic "abs" operation, generic summation
wenzelm@11094
   693
operator \<Sum>;
wenzelm@10452
   694
wenzelm@10391
   695
* HOL/typedef: simplified package, provide more useful rules (see also
wenzelm@10391
   696
HOL/subset.thy);
wenzelm@10391
   697
wenzelm@10915
   698
* HOL/datatype: induction rule for arbitrarily branching datatypes is
wenzelm@10915
   699
now expressed as a proper nested rule (old-style tactic scripts may
wenzelm@10915
   700
require atomize_strip_tac to cope with non-atomic premises);
wenzelm@10915
   701
wenzelm@10915
   702
* HOL: renamed theory "Prod" to "Product_Type", renamed "split" rule
wenzelm@10915
   703
to "split_conv" (old name still available for compatibility);
wenzelm@10915
   704
wenzelm@10915
   705
* HOL: improved concrete syntax for strings (e.g. allows translation
wenzelm@10915
   706
rules with string literals);
wenzelm@10915
   707
paulson@12245
   708
* HOL-Real-Hyperreal: this extends HOL-Real with the hyperreals
paulson@12245
   709
 and Fleuriot's mechanization of analysis, including the transcendental
paulson@12245
   710
 functions for the reals;
paulson@10756
   711
wenzelm@11094
   712
* HOL/Real, HOL/Hyperreal: improved arithmetic simplification;
wenzelm@10391
   713
wenzelm@10858
   714
paulson@10474
   715
*** CTT ***
paulson@10474
   716
wenzelm@10547
   717
* CTT: x-symbol support for Pi, Sigma, -->, : (membership); note that
wenzelm@10547
   718
"lam" is displayed as TWO lambda-symbols
paulson@10474
   719
wenzelm@10547
   720
* CTT: theory Main now available, containing everything (that is, Bool
wenzelm@10547
   721
and Arith);
wenzelm@10547
   722
paulson@10474
   723
wenzelm@10391
   724
*** General ***
wenzelm@10391
   725
wenzelm@10547
   726
* Pure: the Simplifier has been implemented properly as a derived rule
wenzelm@10547
   727
outside of the actual kernel (at last!); the overall performance
wenzelm@10547
   728
penalty in practical applications is about 50%, while reliability of
wenzelm@10547
   729
the Isabelle inference kernel has been greatly improved;
wenzelm@10547
   730
wenzelm@11112
   731
* print modes "brackets" and "no_brackets" control output of nested =>
wenzelm@11112
   732
(types) and ==> (props); the default behaviour is "brackets";
wenzelm@11112
   733
wenzelm@10391
   734
* Provers: fast_tac (and friends) now handle actual object-logic rules
wenzelm@10391
   735
as assumptions as well;
wenzelm@10391
   736
wenzelm@11124
   737
* system: support Poly/ML 4.0;
wenzelm@11124
   738
wenzelm@11124
   739
* system: isatool install handles KDE version 1 or 2;
wenzelm@11124
   740
wenzelm@10391
   741
wenzelm@10245
   742
wenzelm@10103
   743
New in Isabelle99-1 (October 2000)
wenzelm@10103
   744
----------------------------------
wenzelm@8015
   745
wenzelm@10003
   746
*** Overview of INCOMPATIBILITIES ***
paulson@8014
   747
wenzelm@8848
   748
* HOL: simplification of natural numbers is much changed; to partly
wenzelm@8848
   749
recover the old behaviour (e.g. to prevent n+n rewriting to #2*n)
wenzelm@8848
   750
issue the following ML commands:
wenzelm@8848
   751
wenzelm@8848
   752
  Delsimprocs Nat_Numeral_Simprocs.cancel_numerals;
wenzelm@8848
   753
  Delsimprocs [Nat_Numeral_Simprocs.combine_numerals];
paulson@8788
   754
wenzelm@10129
   755
* HOL: simplification no longer dives into case-expressions; this is
wenzelm@10129
   756
controlled by "t.weak_case_cong" for each datatype t;
wenzelm@10003
   757
wenzelm@10003
   758
* HOL: nat_less_induct renamed to less_induct;
wenzelm@10003
   759
wenzelm@10003
   760
* HOL: systematic renaming of the SOME (Eps) rules, may use isatool
wenzelm@10003
   761
fixsome to patch .thy and .ML sources automatically;
paulson@8967
   762
wenzelm@10003
   763
  select_equality  -> some_equality
wenzelm@10003
   764
  select_eq_Ex     -> some_eq_ex
wenzelm@10003
   765
  selectI2EX       -> someI2_ex
wenzelm@10003
   766
  selectI2         -> someI2
wenzelm@10003
   767
  selectI          -> someI
wenzelm@10003
   768
  select1_equality -> some1_equality
wenzelm@10003
   769
  Eps_sym_eq       -> some_sym_eq_trivial
wenzelm@10003
   770
  Eps_eq           -> some_eq_trivial
wenzelm@10003
   771
wenzelm@10003
   772
* HOL: exhaust_tac on datatypes superceded by new generic case_tac;
wenzelm@10003
   773
wenzelm@10003
   774
* HOL: removed obsolete theorem binding expand_if (refer to split_if
wenzelm@10003
   775
instead);
wenzelm@10003
   776
wenzelm@10003
   777
* HOL: the recursion equations generated by 'recdef' are now called
wenzelm@10003
   778
f.simps instead of f.rules;
wenzelm@10003
   779
wenzelm@10003
   780
* HOL: qed_spec_mp now also handles bounded ALL as well;
wenzelm@10003
   781
wenzelm@10003
   782
* HOL: 0 is now overloaded, so the type constraint ":: nat" may
wenzelm@10003
   783
sometimes be needed;
wenzelm@10003
   784
wenzelm@10003
   785
* HOL: the constant for "f``x" is now "image" rather than "op ``";
paulson@8014
   786
paulson@10065
   787
* HOL: the constant for "f-``x" is now "vimage" rather than "op -``";
paulson@10065
   788
wenzelm@9330
   789
* HOL: the disjoint sum is now "<+>" instead of "Plus"; the cartesian
wenzelm@9330
   790
product is now "<*>" instead of "Times"; the lexicographic product is
wenzelm@9330
   791
now "<*lex*>" instead of "**";
nipkow@8705
   792
wenzelm@10003
   793
* HOL: theory Sexp is now in HOL/Induct examples (it used to be part
wenzelm@10003
   794
of main HOL, but was unused); better use HOL's datatype package;
paulson@9971
   795
wenzelm@10137
   796
* HOL: removed "symbols" syntax for constant "override" of theory Map;
wenzelm@10137
   797
the old syntax may be recovered as follows:
wenzelm@10137
   798
wenzelm@10137
   799
  syntax (symbols)
wenzelm@10137
   800
    override  :: "('a ~=> 'b) => ('a ~=> 'b) => ('a ~=> 'b)"
wenzelm@10137
   801
      (infixl "\\<oplus>" 100)
wenzelm@10137
   802
wenzelm@8848
   803
* HOL/Real: "rabs" replaced by overloaded "abs" function;
wenzelm@8848
   804
wenzelm@8887
   805
* HOL/ML: even fewer consts are declared as global (see theories Ord,
wenzelm@8887
   806
Lfp, Gfp, WF); this only affects ML packages that refer to const names
wenzelm@8887
   807
internally;
wenzelm@8887
   808
wenzelm@10003
   809
* HOL and ZF: syntax for quotienting wrt an equivalence relation
wenzelm@10003
   810
changed from A/r to A//r;
wenzelm@9908
   811
wenzelm@10003
   812
* ZF: new treatment of arithmetic (nat & int) may break some old
wenzelm@10003
   813
proofs;
wenzelm@8921
   814
wenzelm@10003
   815
* Isar: renamed some attributes (RS -> THEN, simplify -> simplified,
wenzelm@10003
   816
rulify -> rule_format, elimify -> elim_format, ...);
paulson@9542
   817
wenzelm@9941
   818
* Isar/Provers: intro/elim/dest attributes changed; renamed
wenzelm@9941
   819
intro/intro!/intro!! flags to intro!/intro/intro? (in most cases, one
wenzelm@9937
   820
should have to change intro!! to intro? only); replaced "delrule" by
wenzelm@9937
   821
"rule del";
wenzelm@9437
   822
wenzelm@9612
   823
* Isar/HOL: renamed "intrs" to "intros" in inductive definitions;
wenzelm@9612
   824
wenzelm@9437
   825
* Provers: strengthened force_tac by using new first_best_tac;
oheimb@9402
   826
wenzelm@10003
   827
* LaTeX document preparation: several changes of isabelle.sty (see
wenzelm@10003
   828
lib/texinputs);
wenzelm@8729
   829
paulson@8014
   830
wenzelm@8487
   831
*** Document preparation ***
wenzelm@8358
   832
wenzelm@9198
   833
* formal comments (text blocks etc.) in new-style theories may now
wenzelm@9753
   834
contain antiquotations of thm/prop/term/typ/text to be presented
wenzelm@9753
   835
according to latex print mode; concrete syntax is like this:
wenzelm@9753
   836
@{term[show_types] "f(x) = a + x"};
wenzelm@9198
   837
wenzelm@8358
   838
* isatool mkdir provides easy setup of Isabelle session directories,
wenzelm@8518
   839
including proper document sources;
wenzelm@8358
   840
wenzelm@8358
   841
* generated LaTeX sources are now deleted after successful run
wenzelm@8358
   842
(isatool document -c); may retain a copy somewhere else via -D option
wenzelm@8358
   843
of isatool usedir;
wenzelm@8358
   844
wenzelm@8566
   845
* isatool usedir -D now lets isatool latex -o sty update the Isabelle
wenzelm@10003
   846
style files, achieving self-contained LaTeX sources and simplifying
wenzelm@10003
   847
LaTeX debugging;
wenzelm@8566
   848
wenzelm@8518
   849
* old-style theories now produce (crude) LaTeX output as well;
wenzelm@8358
   850
wenzelm@9057
   851
* browser info session directories are now self-contained (may be put
wenzelm@9437
   852
on WWW server seperately); improved graphs of nested sessions; removed
wenzelm@9437
   853
graph for 'all sessions';
wenzelm@9057
   854
wenzelm@10003
   855
* several improvements in isabelle style files; \isabellestyle{it}
wenzelm@10003
   856
produces fake math mode output; \isamarkupheader is now \section by
wenzelm@10003
   857
default; see lib/texinputs/isabelle.sty etc.;
wenzelm@9489
   858
wenzelm@8358
   859
wenzelm@8184
   860
*** Isar ***
wenzelm@8184
   861
wenzelm@10003
   862
* Isar/Pure: local results and corresponding term bindings are now
wenzelm@10003
   863
subject to Hindley-Milner polymorphism (similar to ML); this
wenzelm@10003
   864
accommodates incremental type-inference very nicely;
wenzelm@8283
   865
wenzelm@10003
   866
* Isar/Pure: new derived language element 'obtain' supports
wenzelm@10003
   867
generalized existence reasoning;
wenzelm@8621
   868
wenzelm@10003
   869
* Isar/Pure: new calculational elements 'moreover' and 'ultimately'
wenzelm@10003
   870
support accumulation of results, without applying any rules yet;
wenzelm@10003
   871
useful to collect intermediate results without explicit name
wenzelm@10003
   872
references, and for use with transitivity rules with more than 2
wenzelm@10003
   873
premises;
wenzelm@8184
   874
wenzelm@10003
   875
* Isar/Pure: scalable support for case-analysis type proofs: new
wenzelm@10003
   876
'case' language element refers to local contexts symbolically, as
wenzelm@10003
   877
produced by certain proof methods; internally, case names are attached
wenzelm@10003
   878
to theorems as "tags";
wenzelm@8440
   879
wenzelm@10003
   880
* Isar/Pure: theory command 'hide' removes declarations from
wenzelm@9330
   881
class/type/const name spaces;
wenzelm@9330
   882
wenzelm@10003
   883
* Isar/Pure: theory command 'defs' supports option "(overloaded)" to
wenzelm@9330
   884
indicate potential overloading;
wenzelm@9330
   885
wenzelm@10003
   886
* Isar/Pure: changed syntax of local blocks from {{ }} to { };
wenzelm@8621
   887
wenzelm@10003
   888
* Isar/Pure: syntax of sorts made 'inner', i.e. have to write
wenzelm@10003
   889
"{a,b,c}" instead of {a,b,c};
wenzelm@9011
   890
wenzelm@10003
   891
* Isar/Pure now provides its own version of intro/elim/dest
wenzelm@10003
   892
attributes; useful for building new logics, but beware of confusion
wenzelm@10003
   893
with the version in Provers/classical;
wenzelm@9612
   894
wenzelm@10003
   895
* Isar/Pure: the local context of (non-atomic) goals is provided via
wenzelm@10003
   896
case name 'antecedent';
wenzelm@8440
   897
wenzelm@10003
   898
* Isar/Pure: removed obsolete 'transfer' attribute (transfer of thms
wenzelm@10003
   899
to the current context is now done automatically);
wenzelm@9383
   900
wenzelm@10003
   901
* Isar/Pure: theory command 'method_setup' provides a simple interface
wenzelm@10003
   902
for definining proof methods in ML;
wenzelm@9612
   903
wenzelm@10003
   904
* Isar/Provers: intro/elim/dest attributes changed; renamed
wenzelm@9941
   905
intro/intro!/intro!! flags to intro!/intro/intro? (INCOMPATIBILITY, in
wenzelm@9941
   906
most cases, one should have to change intro!! to intro? only);
wenzelm@9941
   907
replaced "delrule" by "rule del";
wenzelm@8283
   908
wenzelm@10003
   909
* Isar/Provers: new 'hypsubst' method, plain 'subst' method and
wenzelm@10003
   910
'symmetric' attribute (the latter supercedes [RS sym]);
wenzelm@10003
   911
wenzelm@10003
   912
* Isar/Provers: splitter support (via 'split' attribute and 'simp'
wenzelm@10003
   913
method modifier); 'simp' method: 'only:' modifier removes loopers as
wenzelm@10003
   914
well (including splits);
wenzelm@10003
   915
wenzelm@10003
   916
* Isar/Provers: Simplifier and Classical methods now support all kind
wenzelm@10003
   917
of modifiers used in the past, including 'cong', 'iff', etc.
wenzelm@10003
   918
wenzelm@10003
   919
* Isar/Provers: added 'fastsimp' and 'clarsimp' methods (combination
wenzelm@10003
   920
of Simplifier and Classical reasoner);
wenzelm@10003
   921
wenzelm@10003
   922
* Isar/HOL: new proof method 'cases' and improved version of 'induct'
wenzelm@10003
   923
now support named cases; major packages (inductive, datatype, primrec,
wenzelm@10003
   924
recdef) support case names and properly name parameters;
wenzelm@9612
   925
wenzelm@10003
   926
* Isar/HOL: new transitivity rules for substitution in inequalities --
wenzelm@10003
   927
monotonicity conditions are extracted to be proven at end of
wenzelm@10003
   928
calculations;
wenzelm@10003
   929
wenzelm@10003
   930
* Isar/HOL: removed 'case_split' thm binding, should use 'cases' proof
wenzelm@10003
   931
method anyway;
wenzelm@10003
   932
wenzelm@10003
   933
* Isar/HOL: removed old expand_if = split_if; theorems if_splits =
wenzelm@10003
   934
split_if split_if_asm; datatype package provides theorems foo.splits =
wenzelm@10003
   935
foo.split foo.split_asm for each datatype;
wenzelm@10003
   936
wenzelm@10003
   937
* Isar/HOL: tuned inductive package, rename "intrs" to "intros"
wenzelm@10003
   938
(potential INCOMPATIBILITY), emulation of mk_cases feature for proof
wenzelm@10003
   939
scripts: new 'inductive_cases' command and 'ind_cases' method; (Note:
wenzelm@10003
   940
use "(cases (simplified))" method in proper proof texts);
wenzelm@10003
   941
wenzelm@10003
   942
* Isar/HOL: added global 'arith_split' attribute for 'arith' method;
wenzelm@10003
   943
wenzelm@10003
   944
* Isar: names of theorems etc. may be natural numbers as well;
wenzelm@10003
   945
wenzelm@10003
   946
* Isar: 'pr' command: optional arguments for goals_limit and
wenzelm@9724
   947
ProofContext.prems_limit; no longer prints theory contexts, but only
wenzelm@9724
   948
proof states;
wenzelm@8487
   949
wenzelm@10003
   950
* Isar: diagnostic commands 'pr', 'thm', 'prop', 'term', 'typ' admit
wenzelm@8518
   951
additional print modes to be specified; e.g. "pr(latex)" will print
wenzelm@8518
   952
proof state according to the Isabelle LaTeX style;
wenzelm@8487
   953
wenzelm@10003
   954
* Isar: improved support for emulating tactic scripts, including proof
wenzelm@9612
   955
methods 'rule_tac' etc., 'cut_tac', 'thin_tac', 'subgoal_tac',
wenzelm@9612
   956
'rename_tac', 'rotate_tac', 'tactic', and 'case_tac' / 'induct_tac'
wenzelm@9612
   957
(for HOL datatypes);
wenzelm@8534
   958
wenzelm@10003
   959
* Isar: simplified (more robust) goal selection of proof methods: 1st
wenzelm@10003
   960
goal, all goals, or explicit goal specifier (tactic emulation); thus
wenzelm@10003
   961
'proof method scripts' have to be in depth-first order;
wenzelm@8673
   962
wenzelm@10003
   963
* Isar: tuned 'let' syntax: replaced 'as' keyword by 'and';
wenzelm@8729
   964
wenzelm@10003
   965
* Isar: removed 'help' command, which hasn't been too helpful anyway;
wenzelm@10003
   966
should instead use individual commands for printing items
wenzelm@10003
   967
(print_commands, print_methods etc.);
wenzelm@9224
   968
wenzelm@10003
   969
* Isar: added 'nothing' --- the empty list of theorems;
wenzelm@9239
   970
wenzelm@8184
   971
paulson@8014
   972
*** HOL ***
paulson@8014
   973
wenzelm@10080
   974
* HOL/MicroJava: formalization of a fragment of Java, together with a
wenzelm@10080
   975
corresponding virtual machine and a specification of its bytecode
wenzelm@10080
   976
verifier and a lightweight bytecode verifier, including proofs of
wenzelm@10080
   977
type-safety; by Gerwin Klein, Tobias Nipkow, David von Oheimb, and
wenzelm@10080
   978
Cornelia Pusch (see also the homepage of project Bali at
wenzelm@10080
   979
http://isabelle.in.tum.de/Bali/);
wenzelm@10080
   980
wenzelm@8518
   981
* HOL/Algebra: new theory of rings and univariate polynomials, by
wenzelm@8518
   982
Clemens Ballarin;
paulson@8014
   983
wenzelm@10157
   984
* HOL/NumberTheory: fundamental Theorem of Arithmetic, Chinese
wenzelm@10003
   985
Remainder Theorem, Fermat/Euler Theorem, Wilson's Theorem, by Thomas M
wenzelm@10003
   986
Rasmussen;
wenzelm@8570
   987
wenzelm@10157
   988
* HOL/Lattice: fundamental concepts of lattice theory and order
wenzelm@10157
   989
structures, including duals, properties of bounds versus algebraic
wenzelm@10157
   990
laws, lattice operations versus set-theoretic ones, the Knaster-Tarski
wenzelm@10157
   991
Theorem for complete lattices etc.; may also serve as a demonstration
wenzelm@10157
   992
for abstract algebraic reasoning using axiomatic type classes, and
wenzelm@10157
   993
mathematics-style proof in Isabelle/Isar; by Markus Wenzel;
wenzelm@10157
   994
wenzelm@10003
   995
* HOL/Prolog: a (bare-bones) implementation of Lambda-Prolog, by David
wenzelm@10003
   996
von Oheimb;
paulson@9542
   997
wenzelm@10164
   998
* HOL/IMPP: extension of IMP with local variables and mutually
wenzelm@10164
   999
recursive procedures, by David von Oheimb;
wenzelm@10164
  1000
wenzelm@10003
  1001
* HOL/Lambda: converted into new-style theory and document;
paulson@9542
  1002
wenzelm@10003
  1003
* HOL/ex/Multiquote: example of multiple nested quotations and
wenzelm@10003
  1004
anti-quotations -- basically a generalized version of de-Bruijn
wenzelm@10003
  1005
representation; very useful in avoiding lifting of operations;
wenzelm@8848
  1006
wenzelm@9612
  1007
* HOL/record: added general record equality rule to simpset; fixed
wenzelm@9612
  1008
select-update simplification procedure to handle extended records as
wenzelm@9612
  1009
well; admit "r" as field name;
paulson@9542
  1010
paulson@8967
  1011
* HOL: 0 is now overloaded over the new sort "zero", allowing its use with
paulson@8967
  1012
other numeric types and also as the identity of groups, rings, etc.;
paulson@8967
  1013
paulson@8967
  1014
* HOL: new axclass plus_ac0 for addition with the AC-laws and 0 as identity.
paulson@8967
  1015
Types nat and int belong to this axclass;
paulson@8967
  1016
wenzelm@10003
  1017
* HOL: greatly improved simplification involving numerals of type nat, int, real:
paulson@8788
  1018
   (i + #8 + j) = Suc k simplifies to  #7 + (i + j) = k
paulson@8832
  1019
   i*j + k + j*#3*i     simplifies to  #4*(i*j) + k
paulson@8832
  1020
  two terms #m*u and #n*u are replaced by #(m+n)*u
paulson@8832
  1021
    (where #m, #n and u can implicitly be 1; this is simproc combine_numerals)
paulson@8832
  1022
  and the term/formula #m*u+x ~~ #n*u+y simplifies simplifies to #(m-n)+x ~~ y
paulson@8832
  1023
    or x ~~ #(n-m)+y, where ~~ is one of = < <= or - (simproc cancel_numerals);
paulson@8736
  1024
wenzelm@10003
  1025
* HOL: meson_tac is available (previously in ex/meson.ML); it is a
wenzelm@10003
  1026
powerful prover for predicate logic but knows nothing of clasets; see
wenzelm@10003
  1027
ex/mesontest.ML and ex/mesontest2.ML for example applications;
paulson@9835
  1028
wenzelm@8848
  1029
* HOL: new version of "case_tac" subsumes both boolean case split and
wenzelm@8440
  1030
"exhaust_tac" on datatypes; INCOMPATIBILITY: exhaust_tac no longer
wenzelm@8518
  1031
exists, may define val exhaust_tac = case_tac for ad-hoc portability;
wenzelm@8440
  1032
wenzelm@8848
  1033
* HOL: simplification no longer dives into case-expressions: only the
wenzelm@10129
  1034
selector expression is simplified, but not the remaining arms; to
wenzelm@10129
  1035
enable full simplification of case-expressions for datatype t, you may
wenzelm@10129
  1036
remove t.weak_case_cong from the simpset, either globally (Delcongs
wenzelm@10129
  1037
[thm"t.weak_case_cong"];) or locally (delcongs [...]).
nipkow@8603
  1038
wenzelm@8848
  1039
* HOL/recdef: the recursion equations generated by 'recdef' for
wenzelm@8848
  1040
function 'f' are now called f.simps instead of f.rules; if all
wenzelm@8848
  1041
termination conditions are proved automatically, these simplification
wenzelm@8848
  1042
rules are added to the simpset, as in primrec; rules may be named
wenzelm@8848
  1043
individually as well, resulting in a separate list of theorems for
wenzelm@8848
  1044
each equation;
wenzelm@8848
  1045
wenzelm@9489
  1046
* HOL/While is a new theory that provides a while-combinator. It
wenzelm@9489
  1047
permits the definition of tail-recursive functions without the
wenzelm@9489
  1048
provision of a termination measure. The latter is necessary once the
wenzelm@9489
  1049
invariant proof rule for while is applied.
nipkow@9457
  1050
wenzelm@10003
  1051
* HOL: new (overloaded) notation for the set of elements below/above
wenzelm@10003
  1052
some element: {..u}, {..u(}, {l..}, {)l..}. See theory SetInterval.
nipkow@8925
  1053
wenzelm@8848
  1054
* HOL: theorems impI, allI, ballI bound as "strip";
wenzelm@8848
  1055
wenzelm@10003
  1056
* HOL: new tactic induct_thm_tac: thm -> string -> int -> tactic
nipkow@9746
  1057
induct_tac th "x1 ... xn" expects th to have a conclusion of the form
nipkow@9746
  1058
P v1 ... vn and abbreviates res_inst_tac [("v1","x1"),...,("vn","xn")] th;
nipkow@9746
  1059
wenzelm@10003
  1060
* HOL/Real: "rabs" replaced by overloaded "abs" function;
nipkow@9737
  1061
wenzelm@10003
  1062
* HOL: theory Sexp now in HOL/Induct examples (it used to be part of
wenzelm@10003
  1063
main HOL, but was unused);
nipkow@8626
  1064
wenzelm@10003
  1065
* HOL: fewer consts declared as global (e.g. have to refer to
wenzelm@10003
  1066
"Lfp.lfp" instead of "lfp" internally; affects ML packages only);
wenzelm@8887
  1067
wenzelm@10003
  1068
* HOL: tuned AST representation of nested pairs, avoiding bogus output
wenzelm@10003
  1069
in case of overlap with user translations (e.g. judgements over
wenzelm@10003
  1070
tuples); (note that the underlying logical represenation is still
wenzelm@10003
  1071
bogus);
wenzelm@9349
  1072
nipkow@8412
  1073
paulson@9542
  1074
*** ZF ***
paulson@9542
  1075
wenzelm@10003
  1076
* ZF: simplification automatically cancels common terms in arithmetic
wenzelm@10003
  1077
expressions over nat and int;
paulson@9542
  1078
wenzelm@10003
  1079
* ZF: new treatment of nat to minimize type-checking: all operators
wenzelm@10003
  1080
coerce their operands to a natural number using the function natify,
wenzelm@10003
  1081
making the algebraic laws unconditional;
paulson@9542
  1082
wenzelm@10003
  1083
* ZF: as above, for int: operators coerce their operands to an integer
wenzelm@10003
  1084
using the function intify;
paulson@9542
  1085
wenzelm@10003
  1086
* ZF: the integer library now contains many of the usual laws for the
wenzelm@10003
  1087
orderings, including $<=, and monotonicity laws for $+ and $*;
paulson@9542
  1088
wenzelm@10003
  1089
* ZF: new example ZF/ex/NatSum to demonstrate integer arithmetic
wenzelm@10003
  1090
simplification;
paulson@9388
  1091
wenzelm@10003
  1092
* FOL and ZF: AddIffs now available, giving theorems of the form P<->Q
wenzelm@10003
  1093
to the simplifier and classical reasoner simultaneously;
paulson@9388
  1094
paulson@9388
  1095
wenzelm@8358
  1096
*** General ***
wenzelm@8358
  1097
wenzelm@10003
  1098
* Provers: blast_tac now handles actual object-logic rules as
wenzelm@10003
  1099
assumptions; note that auto_tac uses blast_tac internally as well;
wenzelm@10003
  1100
wenzelm@10003
  1101
* Provers: new functions rulify/rulify_no_asm: thm -> thm for turning
wenzelm@10003
  1102
outer -->/All/Ball into ==>/!!; qed_spec_mp now uses rulify_no_asm;
wenzelm@10003
  1103
wenzelm@9941
  1104
* Provers: delrules now handles destruct rules as well (no longer need
wenzelm@9941
  1105
explicit make_elim);
wenzelm@9941
  1106
wenzelm@10003
  1107
* Provers: Blast_tac now warns of and ignores "weak elimination rules" e.g.
wenzelm@10003
  1108
  [| inj ?f;          ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
wenzelm@10003
  1109
use instead the strong form,
wenzelm@10003
  1110
  [| inj ?f; ~ ?W ==> ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
wenzelm@10003
  1111
in HOL, FOL and ZF the function cla_make_elim will create such rules
wenzelm@10003
  1112
from destruct-rules;
wenzelm@9489
  1113
wenzelm@9709
  1114
* Provers: Simplifier.easy_setup provides a fast path to basic
wenzelm@9709
  1115
Simplifier setup for new object-logics;
wenzelm@9709
  1116
wenzelm@9709
  1117
* Pure: AST translation rules no longer require constant head on LHS;
wenzelm@9349
  1118
wenzelm@9709
  1119
* Pure: improved name spaces: ambiguous output is qualified; support
wenzelm@9709
  1120
for hiding of names;
wenzelm@8729
  1121
wenzelm@10003
  1122
* system: smart setup of canonical ML_HOME, ISABELLE_INTERFACE, and
wenzelm@10003
  1123
XSYMBOL_HOME; no longer need to do manual configuration in most
wenzelm@10003
  1124
situations;
wenzelm@10003
  1125
wenzelm@9709
  1126
* system: compression of ML heaps images may now be controlled via -c
wenzelm@9709
  1127
option of isabelle and isatool usedir (currently only observed by
wenzelm@9709
  1128
Poly/ML);
wenzelm@8358
  1129
wenzelm@9981
  1130
* system: isatool installfonts may handle X-Symbol fonts as well (very
wenzelm@9981
  1131
useful for remote X11);
wenzelm@9981
  1132
wenzelm@9709
  1133
* system: provide TAGS file for Isabelle sources;
wenzelm@9052
  1134
wenzelm@9288
  1135
* ML: infix 'OF' is a version of 'MRS' with more appropriate argument
wenzelm@9288
  1136
order;
wenzelm@9288
  1137
wenzelm@8994
  1138
* ML: renamed flags Syntax.trace_norm_ast to Syntax.trace_ast; global
wenzelm@8994
  1139
timing flag supersedes proof_timing and Toplevel.trace;
wenzelm@8994
  1140
wenzelm@10003
  1141
* ML: new combinators |>> and |>>> for incremental transformations
wenzelm@10003
  1142
with secondary results (e.g. certain theory extensions):
wenzelm@10003
  1143
wenzelm@9330
  1144
* ML: PureThy.add_defs gets additional argument to indicate potential
wenzelm@9330
  1145
overloading (usually false);
wenzelm@9330
  1146
wenzelm@10003
  1147
* ML: PureThy.add_thms/add_axioms/add_defs now return theorems as
wenzelm@10003
  1148
results;
wenzelm@8440
  1149
wenzelm@8358
  1150
wenzelm@8015
  1151
wenzelm@7986
  1152
New in Isabelle99 (October 1999)
wenzelm@7986
  1153
--------------------------------
oheimb@4649
  1154
paulson@5931
  1155
*** Overview of INCOMPATIBILITIES (see below for more details) ***
paulson@5931
  1156
paulson@6922
  1157
* HOL: The THEN and ELSE parts of conditional expressions (if P then x else y)
paulson@6922
  1158
are no longer simplified.  (This allows the simplifier to unfold recursive
paulson@6922
  1159
functional programs.)  To restore the old behaviour, declare
wenzelm@7215
  1160
wenzelm@7215
  1161
    Delcongs [if_weak_cong];
paulson@6922
  1162
wenzelm@6269
  1163
* HOL: Removed the obsolete syntax "Compl A"; use -A for set
wenzelm@6269
  1164
complement;
paulson@5931
  1165
wenzelm@6269
  1166
* HOL: the predicate "inj" is now defined by translation to "inj_on";
paulson@6174
  1167
berghofe@7847
  1168
* HOL/datatype: mutual_induct_tac no longer exists --
berghofe@7847
  1169
  use induct_tac "x_1 ... x_n" instead of mutual_induct_tac ["x_1", ..., "x_n"]
berghofe@7847
  1170
wenzelm@6386
  1171
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
  1172
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
  1173
wenzelm@6269
  1174
* ZF: The con_defs part of an inductive definition may no longer refer
wenzelm@6269
  1175
to constants declared in the same theory;
nipkow@6057
  1176
wenzelm@6269
  1177
* HOL, ZF: the function mk_cases, generated by the inductive
wenzelm@6269
  1178
definition package, has lost an argument.  To simplify its result, it
wenzelm@6269
  1179
uses the default simpset instead of a supplied list of theorems.
paulson@6141
  1180
wenzelm@7215
  1181
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
  1182
nipkow@7619
  1183
* Simplifier: the type of the infix ML functions
wenzelm@8729
  1184
        setSSolver addSSolver setSolver addSolver
nipkow@7619
  1185
is now  simpset * solver -> simpset  where `solver' is a new abstract type
nipkow@7619
  1186
for packaging solvers. A solver is created via
wenzelm@8729
  1187
        mk_solver: string -> (thm list -> int -> tactic) -> solver
nipkow@7619
  1188
where the string argument is only a comment.
nipkow@6057
  1189
wenzelm@7647
  1190
paulson@6069
  1191
*** Proof tools ***
paulson@6069
  1192
wenzelm@6343
  1193
* Provers/Arith/fast_lin_arith.ML contains a functor for creating a
wenzelm@6343
  1194
decision procedure for linear arithmetic. Currently it is used for
wenzelm@7593
  1195
types `nat', `int', and `real' in HOL (see below); it can, should and
wenzelm@7593
  1196
will be instantiated for other types and logics as well.
paulson@6069
  1197
nipkow@7324
  1198
* The simplifier now accepts rewrite rules with flexible heads, eg
nipkow@7324
  1199
     hom ?f ==> ?f(?x+?y) = ?f ?x + ?f ?y
nipkow@7324
  1200
  They are applied like any rule with a non-pattern lhs, i.e. by first-order
nipkow@7324
  1201
  matching.
paulson@6069
  1202
wenzelm@7593
  1203
paulson@6014
  1204
*** General ***
paulson@6014
  1205
wenzelm@7986
  1206
* New Isabelle/Isar subsystem provides an alternative to traditional
wenzelm@7215
  1207
tactical theorem proving; together with the ProofGeneral/isar user
wenzelm@7215
  1208
interface it offers an interactive environment for developing human
wenzelm@7215
  1209
readable proof documents (Isar == Intelligible semi-automated
wenzelm@7886
  1210
reasoning); for further information see isatool doc isar-ref,
wenzelm@7986
  1211
src/HOL/Isar_examples and http://isabelle.in.tum.de/Isar/
wenzelm@7886
  1212
wenzelm@9612
  1213
* improved and simplified presentation of theories: better HTML markup
wenzelm@9612
  1214
(including colors), graph views in several sizes; isatool usedir now
wenzelm@9612
  1215
provides a proper interface for user theories (via -P option); actual
wenzelm@9612
  1216
document preparation based on (PDF)LaTeX is available as well (for
wenzelm@9612
  1217
new-style theories only); see isatool doc system for more information;
wenzelm@7215
  1218
wenzelm@7252
  1219
* native support for Proof General, both for classic Isabelle and
wenzelm@7986
  1220
Isabelle/Isar;
wenzelm@7215
  1221
wenzelm@7791
  1222
* ML function thm_deps visualizes dependencies of theorems and lemmas,
wenzelm@7791
  1223
using the graph browser tool;
wenzelm@7791
  1224
wenzelm@6751
  1225
* Isabelle manuals now also available as PDF;
wenzelm@6751
  1226
wenzelm@6449
  1227
* theory loader rewritten from scratch (may not be fully
wenzelm@6449
  1228
bug-compatible); old loadpath variable has been replaced by show_path,
wenzelm@6671
  1229
add_path, del_path, reset_path functions; new operations such as
wenzelm@7593
  1230
update_thy, touch_thy, remove_thy, use/update_thy_only (see also
wenzelm@7593
  1231
isatool doc ref);
wenzelm@6449
  1232
wenzelm@7215
  1233
* improved isatool install: option -k creates KDE application icon,
wenzelm@7215
  1234
option -p DIR installs standalone binaries;
wenzelm@7215
  1235
wenzelm@7215
  1236
* added ML_PLATFORM setting (useful for cross-platform installations);
wenzelm@7215
  1237
more robust handling of platform specific ML images for SML/NJ;
wenzelm@7215
  1238
wenzelm@7886
  1239
* the settings environment is now statically scoped, i.e. it is never
wenzelm@7986
  1240
created again in sub-processes invoked from isabelle, isatool, or
wenzelm@7886
  1241
Isabelle;
wenzelm@7886
  1242
wenzelm@7215
  1243
* path element specification '~~' refers to '$ISABELLE_HOME';
wenzelm@7215
  1244
wenzelm@6343
  1245
* in locales, the "assumes" and "defines" parts may be omitted if
wenzelm@6343
  1246
empty;
wenzelm@5973
  1247
wenzelm@6269
  1248
* new print_mode "xsymbols" for extended symbol support (e.g. genuine
wenzelm@6269
  1249
long arrows);
wenzelm@6259
  1250
wenzelm@6343
  1251
* new print_mode "HTML";
wenzelm@6343
  1252
wenzelm@6343
  1253
* new flag show_tags controls display of tags of theorems (which are
wenzelm@6343
  1254
basically just comments that may be attached by some tools);
wenzelm@6343
  1255
wenzelm@6461
  1256
* Isamode 2.6 requires patch to accomodate change of Isabelle font
wenzelm@6461
  1257
mode and goal output format:
wenzelm@6461
  1258
wenzelm@6461
  1259
diff -r Isamode-2.6/elisp/isa-load.el Isamode/elisp/isa-load.el
wenzelm@6461
  1260
244c244
wenzelm@6461
  1261
<       (list (isa-getenv "ISABELLE") "-msymbols" logic-name)
wenzelm@6461
  1262
---
wenzelm@6533
  1263
>       (list (isa-getenv "ISABELLE") "-misabelle_font" "-msymbols" logic-name)
wenzelm@6461
  1264
diff -r Isabelle-2.6/elisp/isa-proofstate.el Isamode/elisp/isa-proofstate.el
wenzelm@6461
  1265
181c181
wenzelm@6461
  1266
< (defconst proofstate-proofstart-regexp "^Level [0-9]+$"
wenzelm@6461
  1267
---
wenzelm@6461
  1268
> (defconst proofstate-proofstart-regexp "^Level [0-9]+"
wenzelm@6461
  1269
wenzelm@7450
  1270
* function bind_thms stores lists of theorems (cf. bind_thm);
wenzelm@7450
  1271
wenzelm@7593
  1272
* new shorthand tactics ftac, eatac, datac, fatac;
wenzelm@7593
  1273
wenzelm@7593
  1274
* qed (and friends) now accept "" as result name; in that case the
wenzelm@7986
  1275
theorem is not stored, but proper checks and presentation of the
wenzelm@7986
  1276
result still apply;
wenzelm@7593
  1277
wenzelm@7805
  1278
* theorem database now also indexes constants "Trueprop", "all",
wenzelm@7805
  1279
"==>", "=="; thus thms_containing, findI etc. may retrieve more rules;
wenzelm@7805
  1280
oheimb@6028
  1281
nipkow@6057
  1282
*** HOL ***
nipkow@6057
  1283
wenzelm@7215
  1284
** HOL arithmetic **
wenzelm@7215
  1285
wenzelm@6343
  1286
* There are now decision procedures for linear arithmetic over nat and
wenzelm@6343
  1287
int:
nipkow@6131
  1288
wenzelm@6343
  1289
1. arith_tac copes with arbitrary formulae involving `=', `<', `<=',
wenzelm@6343
  1290
`+', `-', `Suc', `min', `max' and numerical constants; other subterms
wenzelm@6343
  1291
are treated as atomic; subformulae not involving type `nat' or `int'
wenzelm@6343
  1292
are ignored; quantified subformulae are ignored unless they are
wenzelm@6343
  1293
positive universal or negative existential. The tactic has to be
wenzelm@6343
  1294
invoked by hand and can be a little bit slow. In particular, the
wenzelm@6343
  1295
running time is exponential in the number of occurrences of `min' and
wenzelm@6343
  1296
`max', and `-' on `nat'.
nipkow@6131
  1297
wenzelm@6343
  1298
2. fast_arith_tac is a cut-down version of arith_tac: it only takes
wenzelm@6343
  1299
(negated) (in)equalities among the premises and the conclusion into
wenzelm@6343
  1300
account (i.e. no compound formulae) and does not know about `min' and
wenzelm@6343
  1301
`max', and `-' on `nat'. It is fast and is used automatically by the
wenzelm@6343
  1302
simplifier.
nipkow@6131
  1303
wenzelm@6343
  1304
NB: At the moment, these decision procedures do not cope with mixed
wenzelm@6343
  1305
nat/int formulae where the two parts interact, such as `m < n ==>
wenzelm@6343
  1306
int(m) < int(n)'.
oheimb@6028
  1307
wenzelm@7215
  1308
* HOL/Numeral provides a generic theory of numerals (encoded
wenzelm@7313
  1309
efficiently as bit strings); setup for types nat/int/real is in place;
wenzelm@7215
  1310
INCOMPATIBILITY: since numeral syntax is now polymorphic, rather than
wenzelm@7215
  1311
int, existing theories and proof scripts may require a few additional
wenzelm@7215
  1312
type constraints;
wenzelm@7215
  1313
wenzelm@7215
  1314
* integer division and remainder can now be performed on constant
wenzelm@7215
  1315
arguments;
paulson@7157
  1316
wenzelm@7215
  1317
* many properties of integer multiplication, division and remainder
wenzelm@7215
  1318
are now available;
paulson@6922
  1319
paulson@7287
  1320
* An interface to the Stanford Validity Checker (SVC) is available through the
paulson@7287
  1321
tactic svc_tac.  Propositional tautologies and theorems of linear arithmetic
paulson@7287
  1322
are proved automatically.  SVC must be installed separately, and its results
paulson@7287
  1323
must be TAKEN ON TRUST (Isabelle does not check the proofs, but tags any
paulson@7287
  1324
invocation of the underlying oracle).  For SVC see
paulson@7444
  1325
  http://verify.stanford.edu/SVC
paulson@6922
  1326
wenzelm@7125
  1327
* IsaMakefile: the HOL-Real target now builds an actual image;
wenzelm@7125
  1328
wenzelm@7215
  1329
wenzelm@7215
  1330
** HOL misc **
wenzelm@7215
  1331
wenzelm@7595
  1332
* HOL/Real/HahnBanach: the Hahn-Banach theorem for real vector spaces
wenzelm@7595
  1333
(in Isabelle/Isar) -- by Gertrud Bauer;
wenzelm@7595
  1334
wenzelm@7691
  1335
* HOL/BCV: generic model of bytecode verification, i.e. data-flow
wenzelm@7691
  1336
analysis for assembly languages with subtypes;
wenzelm@7691
  1337
wenzelm@6278
  1338
* HOL/TLA (Lamport's Temporal Logic of Actions): major reorganization
wenzelm@6278
  1339
-- avoids syntactic ambiguities and treats state, transition, and
wenzelm@6278
  1340
temporal levels more uniformly; introduces INCOMPATIBILITIES due to
wenzelm@6278
  1341
changed syntax and (many) tactics;
wenzelm@6278
  1342
wenzelm@7791
  1343
* HOL/inductive: Now also handles more general introduction rules such
wenzelm@7791
  1344
  as "ALL y. (y, x) : r --> y : acc r ==> x : acc r"; monotonicity
wenzelm@7791
  1345
  theorems are now maintained within the theory (maintained via the
wenzelm@7791
  1346
  "mono" attribute);
berghofe@7780
  1347
wenzelm@7238
  1348
* HOL/datatype: Now also handles arbitrarily branching datatypes
wenzelm@7238
  1349
  (using function types) such as
wenzelm@7238
  1350
wenzelm@7238
  1351
  datatype 'a tree = Atom 'a | Branch "nat => 'a tree"
berghofe@7047
  1352
wenzelm@7326
  1353
* HOL/record: record_simproc (part of the default simpset) takes care
wenzelm@7326
  1354
of selectors applied to updated records; record_split_tac is no longer
wenzelm@7327
  1355
part of the default claset; update_defs may now be removed from the
wenzelm@7327
  1356
simpset in many cases; COMPATIBILITY: old behavior achieved by
wenzelm@7326
  1357
wenzelm@7326
  1358
  claset_ref () := claset() addSWrapper record_split_wrapper;
wenzelm@7326
  1359
  Delsimprocs [record_simproc]
wenzelm@7326
  1360
wenzelm@6386
  1361
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
  1362
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
  1363
paulson@7287
  1364
* HOL/recdef (TFL): 'congs' syntax now expects comma separated list of theorem
paulson@7287
  1365
names rather than an ML expression;
paulson@7287
  1366
paulson@7287
  1367
* HOL/defer_recdef (TFL): like recdef but the well-founded relation can be
paulson@7287
  1368
supplied later.  Program schemes can be defined, such as
paulson@7287
  1369
    "While B C s = (if B s then While B C (C s) else s)"
paulson@7287
  1370
where the well-founded relation can be chosen after B and C have been given.
wenzelm@6563
  1371
wenzelm@7215
  1372
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
  1373
INCOMPATIBILITY: while [] and infix # syntax is still there, of
wenzelm@7215
  1374
course, ML tools referring to List.list.op # etc. have to be adapted;
wenzelm@7215
  1375
wenzelm@7238
  1376
* HOL_quantifiers flag superseded by "HOL" print mode, which is
wenzelm@7238
  1377
disabled by default; run isabelle with option -m HOL to get back to
wenzelm@7238
  1378
the original Gordon/HOL-style output;
wenzelm@7238
  1379
wenzelm@7238
  1380
* HOL/Ord.thy: new bounded quantifier syntax (input only): ALL x<y. P,
wenzelm@7238
  1381
ALL x<=y. P, EX x<y. P, EX x<=y. P;
wenzelm@7238
  1382
wenzelm@7238
  1383
* HOL basic syntax simplified (more orthogonal): all variants of
wenzelm@7238
  1384
All/Ex now support plain / symbolic / HOL notation; plain syntax for
wenzelm@7238
  1385
Eps operator is provided as well: "SOME x. P[x]";
wenzelm@7238
  1386
berghofe@7320
  1387
* HOL/Sum.thy: sum_case has been moved to HOL/Datatype;
wenzelm@7261
  1388
wenzelm@7280
  1389
* HOL/Univ.thy: infix syntax <*>, <+>, <**>, <+> eliminated and made
wenzelm@7280
  1390
thus available for user theories;
wenzelm@7280
  1391
wenzelm@7300
  1392
* HOLCF/IOA/Sequents: renamed 'Cons' to 'Consq' to avoid clash with
wenzelm@7300
  1393
HOL/List; hardly an INCOMPATIBILITY since '>>' syntax is used all the
wenzelm@7300
  1394
time;
wenzelm@7300
  1395
wenzelm@7986
  1396
* HOL: new tactic smp_tac: int -> int -> tactic, which applies spec
wenzelm@7986
  1397
several times and then mp;
oheimb@7492
  1398
wenzelm@7215
  1399
paulson@7113
  1400
*** LK ***
paulson@7113
  1401
wenzelm@7215
  1402
* the notation <<...>> is now available as a notation for sequences of
wenzelm@7215
  1403
formulas;
paulson@7113
  1404
paulson@7113
  1405
* the simplifier is now installed
paulson@7113
  1406
wenzelm@8729
  1407
* the axiom system has been generalized (thanks to Soren Heilmann)
paulson@7113
  1408
paulson@7113
  1409
* the classical reasoner now has a default rule database
paulson@7113
  1410
paulson@7113
  1411
paulson@6064
  1412
*** ZF ***
paulson@6064
  1413
paulson@6064
  1414
* new primrec section allows primitive recursive functions to be given
wenzelm@6269
  1415
directly (as in HOL) over datatypes and the natural numbers;
paulson@6064
  1416
wenzelm@6269
  1417
* new tactics induct_tac and exhaust_tac for induction (or case
wenzelm@6269
  1418
analysis) over datatypes and the natural numbers;
paulson@6064
  1419
paulson@6064
  1420
* the datatype declaration of type T now defines the recursor T_rec;
paulson@6064
  1421
paulson@6141
  1422
* simplification automatically does freeness reasoning for datatype
wenzelm@6269
  1423
constructors;
paulson@6141
  1424
wenzelm@6269
  1425
* automatic type-inference, with AddTCs command to insert new
wenzelm@6269
  1426
type-checking rules;
paulson@6155
  1427
wenzelm@6269
  1428
* datatype introduction rules are now added as Safe Introduction rules
wenzelm@6269
  1429
to the claset;
paulson@6155
  1430
wenzelm@6269
  1431
* the syntax "if P then x else y" is now available in addition to
wenzelm@6269
  1432
if(P,x,y);
wenzelm@6269
  1433
paulson@6069
  1434
wenzelm@6343
  1435
*** Internal programming interfaces ***
wenzelm@6343
  1436
wenzelm@7919
  1437
* tuned simplifier trace output; new flag debug_simp;
wenzelm@7919
  1438
wenzelm@7420
  1439
* structures Vartab / Termtab (instances of TableFun) offer efficient
wenzelm@7420
  1440
tables indexed by indexname_ord / term_ord (compatible with aconv);
wenzelm@7420
  1441
wenzelm@6386
  1442
* AxClass.axclass_tac lost the theory argument;
wenzelm@6386
  1443
wenzelm@6343
  1444
* tuned current_goals_markers semantics: begin / end goal avoids
wenzelm@6343
  1445
printing empty lines;
wenzelm@6343
  1446
wenzelm@6343
  1447
* removed prs and prs_fn hook, which was broken because it did not
wenzelm@6343
  1448
include \n in its semantics, forcing writeln to add one
wenzelm@6343
  1449
uncoditionally; replaced prs_fn by writeln_fn; consider std_output:
wenzelm@6343
  1450
string -> unit if you really want to output text without newline;
wenzelm@6343
  1451
wenzelm@6343
  1452
* Symbol.output subject to print mode; INCOMPATIBILITY: defaults to
wenzelm@6343
  1453
plain output, interface builders may have to enable 'isabelle_font'
wenzelm@6343
  1454
mode to get Isabelle font glyphs as before;
wenzelm@6343
  1455
wenzelm@6343
  1456
* refined token_translation interface; INCOMPATIBILITY: output length
wenzelm@6343
  1457
now of type real instead of int;
wenzelm@6343
  1458
wenzelm@7196
  1459
* theory loader actions may be traced via new ThyInfo.add_hook
wenzelm@7196
  1460
interface (see src/Pure/Thy/thy_info.ML); example application: keep
wenzelm@7196
  1461
your own database of information attached to *whole* theories -- as
wenzelm@7196
  1462
opposed to intra-theory data slots offered via TheoryDataFun;
wenzelm@7196
  1463
wenzelm@7647
  1464
* proper handling of dangling sort hypotheses (at last!);
wenzelm@7647
  1465
Thm.strip_shyps and Drule.strip_shyps_warning take care of removing
wenzelm@7647
  1466
extra sort hypotheses that can be witnessed from the type signature;
wenzelm@7986
  1467
the force_strip_shyps flag is gone, any remaining shyps are simply
wenzelm@7986
  1468
left in the theorem (with a warning issued by strip_shyps_warning);
wenzelm@7647
  1469
wenzelm@6343
  1470
paulson@6064
  1471
wenzelm@5781
  1472
New in Isabelle98-1 (October 1998)
wenzelm@5781
  1473
----------------------------------
wenzelm@5781
  1474
wenzelm@5127
  1475
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4842
  1476
wenzelm@5726
  1477
* several changes of automated proof tools;
wenzelm@5373
  1478
wenzelm@5726
  1479
* HOL: major changes to the inductive and datatype packages, including
wenzelm@5726
  1480
some minor incompatibilities of theory syntax;
berghofe@5214
  1481
wenzelm@5726
  1482
* HOL: renamed r^-1 to 'converse' from 'inverse'; 'inj_onto' is now
wenzelm@5217
  1483
called `inj_on';
paulson@5160
  1484
nipkow@5275
  1485
* HOL: removed duplicate thms in Arith:
nipkow@5275
  1486
  less_imp_add_less  should be replaced by  trans_less_add1
nipkow@5275
  1487
  le_imp_add_le      should be replaced by  trans_le_add1
paulson@5160
  1488
wenzelm@5726
  1489
* HOL: unary minus is now overloaded (new type constraints may be
wenzelm@5726
  1490
required);
paulson@5490
  1491
wenzelm@5726
  1492
* HOL and ZF: unary minus for integers is now #- instead of #~.  In
wenzelm@5726
  1493
ZF, expressions such as n#-1 must be changed to n#- 1, since #-1 is
wenzelm@5726
  1494
now taken as an integer constant.
paulson@5541
  1495
wenzelm@5726
  1496
* Pure: ML function 'theory_of' renamed to 'theory';
wenzelm@5397
  1497
wenzelm@5363
  1498
wenzelm@5127
  1499
*** Proof tools ***
nipkow@4880
  1500
nipkow@5657
  1501
* Simplifier:
nipkow@5657
  1502
  1. Asm_full_simp_tac is now more aggressive.
nipkow@5657
  1503
     1. It will sometimes reorient premises if that increases their power to
nipkow@5657
  1504
        simplify.
nipkow@5657
  1505
     2. It does no longer proceed strictly from left to right but may also
nipkow@5657
  1506
        rotate premises to achieve further simplification.
nipkow@5657
  1507
     For compatibility reasons there is now Asm_lr_simp_tac which is like the
nipkow@5657
  1508
     old Asm_full_simp_tac in that it does not rotate premises.
nipkow@5657
  1509
  2. The simplifier now knows a little bit about nat-arithmetic.
nipkow@4880
  1510
wenzelm@5127
  1511
* Classical reasoner: wrapper mechanism for the classical reasoner now
wenzelm@5127
  1512
allows for selected deletion of wrappers, by introduction of names for
wenzelm@5127
  1513
wrapper functionals.  This implies that addbefore, addSbefore,
wenzelm@5127
  1514
addaltern, and addSaltern now take a pair (name, tactic) as argument,
wenzelm@5127
  1515
and that adding two tactics with the same name overwrites the first
wenzelm@5127
  1516
one (emitting a warning).
oheimb@4824
  1517
  type wrapper = (int -> tactic) -> (int -> tactic)
oheimb@4649
  1518
  setWrapper, setSWrapper, compWrapper and compSWrapper are replaced by
oheimb@4824
  1519
  addWrapper, addSWrapper: claset * (string * wrapper) -> claset
oheimb@4824
  1520
  delWrapper, delSWrapper: claset *  string            -> claset
oheimb@4649
  1521
  getWrapper is renamed to appWrappers, getSWrapper to appSWrappers;
oheimb@4649
  1522
wenzelm@5705
  1523
* Classical reasoner: addbefore/addSbefore now have APPEND/ORELSE
wenzelm@5726
  1524
semantics; addbefore now affects only the unsafe part of step_tac
wenzelm@5726
  1525
etc.; this affects addss/auto_tac/force_tac, so EXISTING PROOFS MAY
wenzelm@5726
  1526
FAIL, but proofs should be fixable easily, e.g. by replacing Auto_tac
wenzelm@5726
  1527
by Force_tac;
oheimb@5524
  1528
wenzelm@5726
  1529
* Classical reasoner: setwrapper to setWrapper and compwrapper to
wenzelm@5726
  1530
compWrapper; added safe wrapper (and access functions for it);
oheimb@5524
  1531
wenzelm@5127
  1532
* HOL/split_all_tac is now much faster and fails if there is nothing
wenzelm@5726
  1533
to split.  Some EXISTING PROOFS MAY REQUIRE ADAPTION because the order
wenzelm@5726
  1534
and the names of the automatically generated variables have changed.
wenzelm@5726
  1535
split_all_tac has moved within claset() from unsafe wrappers to safe
wenzelm@5726
  1536
wrappers, which means that !!-bound variables are split much more
wenzelm@5726
  1537
aggressively, and safe_tac and clarify_tac now split such variables.
wenzelm@5726
  1538
If this splitting is not appropriate, use delSWrapper "split_all_tac".
wenzelm@5726
  1539
Note: the same holds for record_split_tac, which does the job of
wenzelm@5726
  1540
split_all_tac for record fields.
wenzelm@5127
  1541
wenzelm@5726
  1542
* HOL/Simplifier: Rewrite rules for case distinctions can now be added
wenzelm@5726
  1543
permanently to the default simpset using Addsplits just like
wenzelm@5726
  1544
Addsimps. They can be removed via Delsplits just like
wenzelm@5726
  1545
Delsimps. Lower-case versions are also available.
wenzelm@5127
  1546
wenzelm@5726
  1547
* HOL/Simplifier: The rule split_if is now part of the default
wenzelm@5726
  1548
simpset. This means that the simplifier will eliminate all occurrences
wenzelm@5726
  1549
of if-then-else in the conclusion of a goal. To prevent this, you can
wenzelm@5726
  1550
either remove split_if completely from the default simpset by
wenzelm@5726
  1551
`Delsplits [split_if]' or remove it in a specific call of the
wenzelm@5726
  1552
simplifier using `... delsplits [split_if]'.  You can also add/delete
wenzelm@5726
  1553
other case splitting rules to/from the default simpset: every datatype
wenzelm@5726
  1554
generates suitable rules `split_t_case' and `split_t_case_asm' (where
wenzelm@5726
  1555
t is the name of the datatype).
wenzelm@5127
  1556
wenzelm@5726
  1557
* Classical reasoner / Simplifier combination: new force_tac (and
wenzelm@5127
  1558
derivatives Force_tac, force) combines rewriting and classical
wenzelm@5127
  1559
reasoning (and whatever other tools) similarly to auto_tac, but is
wenzelm@5726
  1560
aimed to solve the given subgoal completely.
wenzelm@5127
  1561
wenzelm@5127
  1562
wenzelm@5127
  1563
*** General ***
wenzelm@5127
  1564
wenzelm@5217
  1565
* new top-level commands `Goal' and `Goalw' that improve upon `goal'
wenzelm@5127
  1566
and `goalw': the theory is no longer needed as an explicit argument -
wenzelm@5127
  1567
the current theory context is used; assumptions are no longer returned
wenzelm@5127
  1568
at the ML-level unless one of them starts with ==> or !!; it is
wenzelm@5217
  1569
recommended to convert to these new commands using isatool fixgoal
wenzelm@5217
  1570
(backup your sources first!);
wenzelm@4842
  1571
wenzelm@5217
  1572
* new top-level commands 'thm' and 'thms' for retrieving theorems from
wenzelm@5207
  1573
the current theory context, and 'theory' to lookup stored theories;
paulson@4806
  1574
paulson@5722
  1575
* new theory section 'locale' for declaring constants, assumptions and
paulson@5722
  1576
definitions that have local scope;
paulson@5722
  1577
wenzelm@5127
  1578
* new theory section 'nonterminals' for purely syntactic types;
wenzelm@4858
  1579
wenzelm@5127
  1580
* new theory section 'setup' for generic ML setup functions
wenzelm@5127
  1581
(e.g. package initialization);
wenzelm@4869
  1582
wenzelm@5131
  1583
* the distribution now includes Isabelle icons: see
wenzelm@5131
  1584
lib/logo/isabelle-{small,tiny}.xpm;
wenzelm@5131
  1585
wenzelm@5363
  1586
* isatool install - install binaries with absolute references to
wenzelm@5363
  1587
ISABELLE_HOME/bin;
wenzelm@5363
  1588
wenzelm@5572
  1589
* isatool logo -- create instances of the Isabelle logo (as EPS);
wenzelm@5572
  1590
wenzelm@5407
  1591
* print mode 'emacs' reserved for Isamode;
wenzelm@5407
  1592
wenzelm@5726
  1593
* support multiple print (ast) translations per constant name;
wenzelm@5726
  1594
wenzelm@6925
  1595
* theorems involving oracles are now printed with a suffixed [!];
wenzelm@6925
  1596
wenzelm@4711
  1597
paulson@4661
  1598
*** HOL ***
paulson@4661
  1599
wenzelm@5710
  1600
* there is now a tutorial on Isabelle/HOL (do 'isatool doc tutorial');
nipkow@5709
  1601
wenzelm@5217
  1602
* HOL/inductive package reorganized and improved: now supports mutual
paulson@5267
  1603
definitions such as
wenzelm@5217
  1604
wenzelm@5217
  1605
  inductive EVEN ODD
wenzelm@5217
  1606
    intrs
wenzelm@5217
  1607
      null "0 : EVEN"
wenzelm@5217
  1608
      oddI "n : EVEN ==> Suc n : ODD"
wenzelm@5217
  1609
      evenI "n : ODD ==> Suc n : EVEN"
wenzelm@5217
  1610
wenzelm@5217
  1611
new theorem list "elims" contains an elimination rule for each of the
wenzelm@5217
  1612
recursive sets; inductive definitions now handle disjunctive premises
wenzelm@5217
  1613
correctly (also ZF);
berghofe@5214
  1614
wenzelm@5217
  1615
INCOMPATIBILITIES: requires Inductive as an ancestor; component
wenzelm@5217
  1616
"mutual_induct" no longer exists - the induction rule is always
wenzelm@5217
  1617
contained in "induct";
wenzelm@5217
  1618
wenzelm@5217
  1619
wenzelm@5217
  1620
* HOL/datatype package re-implemented and greatly improved: now
paulson@5267
  1621
supports mutually recursive datatypes such as
wenzelm@5217
  1622
wenzelm@5217
  1623
  datatype
wenzelm@5217
  1624
    'a aexp = IF_THEN_ELSE ('a bexp) ('a aexp) ('a aexp)
wenzelm@5217
  1625
            | SUM ('a aexp) ('a aexp)
wenzelm@5217
  1626
            | DIFF ('a aexp) ('a aexp)
wenzelm@5217
  1627
            | NUM 'a
wenzelm@5217
  1628
  and
wenzelm@5217
  1629
    'a bexp = LESS ('a aexp) ('a aexp)
wenzelm@5217
  1630
            | AND ('a bexp) ('a bexp)
wenzelm@5217
  1631
            | OR ('a bexp) ('a bexp)
wenzelm@5217
  1632
paulson@5267
  1633
as well as indirectly recursive datatypes such as
berghofe@5214
  1634
wenzelm@5217
  1635
  datatype
wenzelm@5217
  1636
    ('a, 'b) term = Var 'a
wenzelm@5217
  1637
                  | App 'b ((('a, 'b) term) list)
berghofe@5214
  1638
wenzelm@5217
  1639
The new tactic  mutual_induct_tac [<var_1>, ..., <var_n>] i  performs
wenzelm@5217
  1640
induction on mutually / indirectly recursive datatypes.
wenzelm@5217
  1641
wenzelm@5217
  1642
Primrec equations are now stored in theory and can be accessed via
wenzelm@5217
  1643
<function_name>.simps.
wenzelm@5217
  1644
wenzelm@5217
  1645
INCOMPATIBILITIES:
berghofe@5214
  1646
wenzelm@5217
  1647
  - Theories using datatypes must now have theory Datatype as an
wenzelm@5217
  1648
    ancestor.
wenzelm@5217
  1649
  - The specific <typename>.induct_tac no longer exists - use the
wenzelm@5217
  1650
    generic induct_tac instead.
berghofe@5226
  1651
  - natE has been renamed to nat.exhaust - use exhaust_tac
wenzelm@5217
  1652
    instead of res_inst_tac ... natE. Note that the variable
berghofe@5226
  1653
    names in nat.exhaust differ from the names in natE, this
wenzelm@5217
  1654
    may cause some "fragile" proofs to fail.
wenzelm@5217
  1655
  - The theorems split_<typename>_case and split_<typename>_case_asm
wenzelm@5217
  1656
    have been renamed to <typename>.split and <typename>.split_asm.
wenzelm@5217
  1657
  - Since default sorts of type variables are now handled correctly,
wenzelm@5217
  1658
    some datatype definitions may have to be annotated with explicit
wenzelm@5217
  1659
    sort constraints.
wenzelm@5217
  1660
  - Primrec definitions no longer require function name and type
wenzelm@5217
  1661
    of recursive argument.
berghofe@5214
  1662
wenzelm@5217
  1663
Consider using isatool fixdatatype to adapt your theories and proof
wenzelm@5217
  1664
scripts to the new package (backup your sources first!).
wenzelm@5217
  1665
wenzelm@5217
  1666
wenzelm@5726
  1667
* HOL/record package: considerably improved implementation; now
wenzelm@5726
  1668
includes concrete syntax for record types, terms, updates; theorems
wenzelm@5726
  1669
for surjective pairing and splitting !!-bound record variables; proof
wenzelm@5726
  1670
support is as follows:
wenzelm@5726
  1671
wenzelm@5726
  1672
  1) standard conversions (selectors or updates applied to record
wenzelm@5726
  1673
constructor terms) are part of the standard simpset;
wenzelm@5726
  1674
wenzelm@5726
  1675
  2) inject equations of the form ((x, y) = (x', y')) == x=x' & y=y' are
wenzelm@5726
  1676
made part of standard simpset and claset via addIffs;
wenzelm@5726
  1677
wenzelm@5726
  1678
  3) a tactic for record field splitting (record_split_tac) is part of
wenzelm@5726
  1679
the standard claset (addSWrapper);
wenzelm@5726
  1680
wenzelm@5726
  1681
To get a better idea about these rules you may retrieve them via
wenzelm@5726
  1682
something like 'thms "foo.simps"' or 'thms "foo.iffs"', where "foo" is
wenzelm@5726
  1683
the name of your record type.
wenzelm@5726
  1684
wenzelm@5726
  1685
The split tactic 3) conceptually simplifies by the following rule:
wenzelm@5726
  1686
wenzelm@5726
  1687
  "(!!x. PROP ?P x) == (!!a b. PROP ?P (a, b))"
wenzelm@5726
  1688
wenzelm@5726
  1689
Thus any record variable that is bound by meta-all will automatically
wenzelm@5726
  1690
blow up into some record constructor term, consequently the
wenzelm@5726
  1691
simplifications of 1), 2) apply.  Thus force_tac, auto_tac etc. shall
wenzelm@5726
  1692
solve record problems automatically.
wenzelm@5726
  1693
berghofe@5214
  1694
wenzelm@5125
  1695
* reorganized the main HOL image: HOL/Integ and String loaded by
wenzelm@5125
  1696
default; theory Main includes everything;
wenzelm@5125
  1697
paulson@5650
  1698
* automatic simplification of integer sums and comparisons, using cancellation;
paulson@5650
  1699
oheimb@5526
  1700
* added option_map_eq_Some and not_Some_eq to the default simpset and claset;
wenzelm@5127
  1701
wenzelm@5127
  1702
* added disj_not1 = "(~P | Q) = (P --> Q)" to the default simpset;
wenzelm@5127
  1703
wenzelm@5127
  1704
* many new identities for unions, intersections, set difference, etc.;
wenzelm@5127
  1705
wenzelm@5127
  1706
* expand_if, expand_split, expand_sum_case and expand_nat_case are now
wenzelm@5127
  1707
called split_if, split_split, split_sum_case and split_nat_case (to go
wenzelm@5127
  1708
with add/delsplits);
wenzelm@5125
  1709
wenzelm@5127
  1710
* HOL/Prod introduces simplification procedure unit_eq_proc rewriting
wenzelm@5127
  1711
(?x::unit) = (); this is made part of the default simpset, which COULD
wenzelm@5127
  1712
MAKE EXISTING PROOFS FAIL under rare circumstances (consider
wenzelm@5207
  1713
'Delsimprocs [unit_eq_proc];' as last resort); also note that
wenzelm@5207
  1714
unit_abs_eta_conv is added in order to counter the effect of
wenzelm@5207
  1715
unit_eq_proc on (%u::unit. f u), replacing it by f rather than by
wenzelm@5207
  1716
%u.f();
wenzelm@5125
  1717
wenzelm@5217
  1718
* HOL/Fun INCOMPATIBILITY: `inj_onto' is now called `inj_on' (which
wenzelm@5217
  1719
makes more sense);
berghofe@5109
  1720
paulson@5475
  1721
* HOL/Set INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
  1722
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
  1723
  disjointness reasoning but breaking a few old proofs.
paulson@5267
  1724
wenzelm@5217
  1725
* HOL/Relation INCOMPATIBILITY: renamed the relational operator r^-1
wenzelm@5217
  1726
to 'converse' from 'inverse' (for compatibility with ZF and some
wenzelm@5217
  1727
literature);
wenzelm@5085
  1728
wenzelm@5127
  1729
* HOL/recdef can now declare non-recursive functions, with {} supplied as
wenzelm@5127
  1730
the well-founded relation;
oheimb@4838
  1731
paulson@5490
  1732
* HOL/Set INCOMPATIBILITY: the complement of set A is now written -A instead of
paulson@5490
  1733
    Compl A.  The "Compl" syntax remains available as input syntax for this
paulson@5490
  1734
    release ONLY.
paulson@5490
  1735
wenzelm@5127
  1736
* HOL/Update: new theory of function updates:
wenzelm@5127
  1737
    f(a:=b) == %x. if x=a then b else f x
wenzelm@5127
  1738
may also be iterated as in f(a:=b,c:=d,...);
nipkow@5077
  1739
wenzelm@5127
  1740
* HOL/Vimage: new theory for inverse image of a function, syntax f-``B;
paulson@4899
  1741
nipkow@5282
  1742
* HOL/List:
nipkow@5282
  1743
  - new function list_update written xs[i:=v] that updates the i-th
nipkow@5282
  1744
    list position. May also be iterated as in xs[i:=a,j:=b,...].
nipkow@5428
  1745
  - new function `upt' written [i..j(] which generates the list
nipkow@5428
  1746
    [i,i+1,...,j-1], i.e. the upper bound is excluded. To include the upper
nipkow@5428
  1747
    bound write [i..j], which is a shorthand for [i..j+1(].
nipkow@5282
  1748
  - new lexicographic orderings and corresponding wellfoundedness theorems.
paulson@4779
  1749
wenzelm@5127
  1750
* HOL/Arith:
wenzelm@5127
  1751
  - removed 'pred' (predecessor) function;
wenzelm@5127
  1752
  - generalized some theorems about n-1;
wenzelm@5127
  1753
  - many new laws about "div" and "mod";
wenzelm@5127
  1754
  - new laws about greatest common divisors (see theory ex/Primes);
oheimb@4766
  1755
wenzelm@5127
  1756
* HOL/Relation: renamed the relational operator r^-1 "converse"
wenzelm@4842
  1757
instead of "inverse";
wenzelm@4711
  1758
nipkow@5651
  1759
* HOL/Induct/Multiset: a theory of multisets, including the wellfoundedness
nipkow@5651
  1760
  of the multiset ordering;
nipkow@5651
  1761
wenzelm@5127
  1762
* directory HOL/Real: a construction of the reals using Dedekind cuts
nipkow@5651
  1763
  (not included by default);
nipkow@4835
  1764
wenzelm@5127
  1765
* directory HOL/UNITY: Chandy and Misra's UNITY formalism;
wenzelm@4711
  1766
nipkow@5651
  1767
* directory HOL/Hoare: a new version of Hoare logic which permits many-sorted
nipkow@5651
  1768
  programs, i.e. different program variables may have different types.
nipkow@5651
  1769
paulson@5142
  1770
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
  1771
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
  1772
  Now rew can involve either definitions or equalities (either == or =).
wenzelm@5002
  1773
wenzelm@5363
  1774
paulson@4879
  1775
*** ZF ***
paulson@4879
  1776
paulson@5332
  1777
* theory Main includes everything; INCOMPATIBILITY: theory ZF.thy contains
paulson@5332
  1778
  only the theorems proved on ZF.ML;
paulson@5160
  1779
paulson@5475
  1780
* ZF INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
  1781
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
  1782
  disjointness reasoning but breaking a few old proofs.
paulson@5267
  1783
paulson@5160
  1784
* ZF/Update: new theory of function updates
paulson@5160
  1785
    with default rewrite rule  f(x:=y) ` z = if(z=x, y, f`z)
paulson@5160
  1786
  may also be iterated as in f(a:=b,c:=d,...);
paulson@5160
  1787
paulson@4879
  1788
* in  let x=t in u(x), neither t nor u(x) has to be an FOL term.
oheimb@4649
  1789
paulson@5142
  1790
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
  1791
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
  1792
  Now rew can involve either definitions or equalities (either == or =).
paulson@5142
  1793
paulson@5160
  1794
* case_tac provided for compatibility with HOL
paulson@5160
  1795
    (like the old excluded_middle_tac, but with subgoals swapped)
paulson@5160
  1796
wenzelm@4842
  1797
wenzelm@5127
  1798
*** Internal programming interfaces ***
wenzelm@5002
  1799
wenzelm@5251
  1800
* Pure: several new basic modules made available for general use, see
wenzelm@5251
  1801
also src/Pure/README;
wenzelm@5207
  1802
wenzelm@5008
  1803
* improved the theory data mechanism to support encapsulation (data
wenzelm@5008
  1804
kind name replaced by private Object.kind, acting as authorization
wenzelm@5373
  1805
key); new type-safe user interface via functor TheoryDataFun; generic
wenzelm@5373
  1806
print_data function becomes basically useless;
wenzelm@5002
  1807
wenzelm@5251
  1808
* removed global_names compatibility flag -- all theory declarations
wenzelm@5251
  1809
are qualified by default;
wenzelm@5251
  1810
wenzelm@5085
  1811
* module Pure/Syntax now offers quote / antiquote translation
wenzelm@5085
  1812
functions (useful for Hoare logic etc. with implicit dependencies);
wenzelm@5373
  1813
see HOL/ex/Antiquote for an example use;
wenzelm@5085
  1814
wenzelm@5127
  1815
* Simplifier now offers conversions (asm_)(full_)rewrite: simpset ->
wenzelm@5127
  1816
cterm -> thm;
wenzelm@5127
  1817
wenzelm@5207
  1818
* new tactical CHANGED_GOAL for checking that a tactic modifies a
wenzelm@5207
  1819
subgoal;
paulson@5142
  1820
wenzelm@5251
  1821
* Display.print_goals function moved to Locale.print_goals;
wenzelm@5251
  1822
wenzelm@5731
  1823
* standard print function for goals supports current_goals_markers
wenzelm@5731
  1824
variable for marking begin of proof, end of proof, start of goal; the
wenzelm@5731
  1825
default is ("", "", ""); setting current_goals_markers := ("<proof>",
wenzelm@5731
  1826
"</proof>", "<goal>") causes SGML like tagged proof state printing,
wenzelm@5731
  1827
for example;
wenzelm@5731
  1828
wenzelm@5002
  1829
wenzelm@5002
  1830
wenzelm@4410
  1831
New in Isabelle98 (January 1998)
wenzelm@4410
  1832
--------------------------------
wenzelm@4410
  1833
wenzelm@4410
  1834
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4410
  1835
wenzelm@4410
  1836
* changed lexical syntax of terms / types: dots made part of long
wenzelm@4410
  1837
identifiers, e.g. "%x.x" no longer possible, should be "%x. x";
wenzelm@4410
  1838
wenzelm@4410
  1839
* simpset (and claset) reference variable replaced by functions
wenzelm@4410
  1840
simpset / simpset_ref;
wenzelm@4410
  1841
wenzelm@4410
  1842
* no longer supports theory aliases (via merge) and non-trivial
wenzelm@4410
  1843
implicit merge of thms' signatures;
wenzelm@4410
  1844
wenzelm@4410
  1845
* most internal names of constants changed due to qualified names;
wenzelm@4410
  1846
wenzelm@4410
  1847
* changed Pure/Sequence interface (see Pure/seq.ML);
wenzelm@4410
  1848
wenzelm@3454
  1849
paulson@3715
  1850
*** General Changes ***
paulson@3715
  1851
wenzelm@4174
  1852
* hierachically structured name spaces (for consts, types, axms, thms
wenzelm@3943
  1853
etc.); new lexical class 'longid' (e.g. Foo.bar.x) may render much of
wenzelm@4108
  1854
old input syntactically incorrect (e.g. "%x.x"); COMPATIBILITY:
wenzelm@4108
  1855
isatool fixdots ensures space after dots (e.g. "%x. x"); set
wenzelm@4174
  1856
long_names for fully qualified output names; NOTE: ML programs
wenzelm@4174
  1857
(special tactics, packages etc.) referring to internal names may have
wenzelm@4174
  1858
to be adapted to cope with fully qualified names; in case of severe
wenzelm@4174
  1859
backward campatibility problems try setting 'global_names' at compile
wenzelm@4174
  1860
time to have enrything declared within a flat name space; one may also
wenzelm@4174
  1861
fine tune name declarations in theories via the 'global' and 'local'
wenzelm@4174
  1862
section;
wenzelm@4108
  1863
wenzelm@4108
  1864
* reimplemented the implicit simpset and claset using the new anytype
wenzelm@4108
  1865
data filed in signatures; references simpset:simpset ref etc. are
wenzelm@4108
  1866
replaced by functions simpset:unit->simpset and
wenzelm@4108
  1867
simpset_ref:unit->simpset ref; COMPATIBILITY: use isatool fixclasimp
wenzelm@4108
  1868
to patch your ML files accordingly;
paulson@3856
  1869
wenzelm@3857
  1870
* HTML output now includes theory graph data for display with Java
wenzelm@3857
  1871
applet or isatool browser; data generated automatically via isatool
wenzelm@3901
  1872
usedir (see -i option, ISABELLE_USEDIR_OPTIONS);
wenzelm@3857
  1873
paulson@3856
  1874
* defs may now be conditional; improved rewrite_goals_tac to handle
paulson@3856
  1875
conditional equations;
paulson@3856
  1876
wenzelm@4174
  1877
* defs now admits additional type arguments, using TYPE('a) syntax;
wenzelm@4174
  1878
wenzelm@3901
  1879
* theory aliases via merge (e.g. M=A+B+C) no longer supported, always
wenzelm@3901
  1880
creates a new theory node; implicit merge of thms' signatures is
wenzelm@4112
  1881
restricted to 'trivial' ones; COMPATIBILITY: one may have to use
wenzelm@3901
  1882
transfer:theory->thm->thm in (rare) cases;
wenzelm@3901
  1883
wenzelm@3968
  1884
* improved handling of draft signatures / theories; draft thms (and
wenzelm@3968
  1885
ctyps, cterms) are automatically promoted to real ones;
wenzelm@3968
  1886
wenzelm@3901
  1887
* slightly changed interfaces for oracles: admit many per theory, named
wenzelm@3901
  1888
(e.g. oracle foo = mlfun), additional name argument for invoke_oracle;
wenzelm@3901
  1889
wenzelm@3901
  1890
* print_goals: optional output of const types (set show_consts and
wenzelm@3901
  1891
show_types);
wenzelm@3851
  1892
wenzelm@4388
  1893
* improved output of warnings (###) and errors (***);
wenzelm@3697
  1894
paulson@4178
  1895
* subgoal_tac displays a warning if the new subgoal has type variables;
paulson@4178
  1896
paulson@3715
  1897
* removed old README and Makefiles;
wenzelm@3697
  1898
paulson@3856
  1899
* replaced print_goals_ref hook by print_current_goals_fn and result_error_fn;
wenzelm@3670
  1900
paulson@3715
  1901
* removed obsolete init_pps and init_database;
paulson@3715
  1902
paulson@3715
  1903
* deleted the obsolete tactical STATE, which was declared by
paulson@3715
  1904
    fun STATE tacfun st = tacfun st st;
paulson@3715
  1905
wenzelm@4388
  1906
* cd and use now support path variables, e.g. $ISABELLE_HOME, or ~
wenzelm@4388
  1907
(which abbreviates $HOME);
wenzelm@4269
  1908
wenzelm@4269
  1909
* changed Pure/Sequence interface (see Pure/seq.ML); COMPATIBILITY:
wenzelm@4269
  1910
use isatool fixseq to adapt your ML programs (this works for fully
wenzelm@4269
  1911
qualified references to the Sequence structure only!);
wenzelm@4269
  1912
wenzelm@4381
  1913
* use_thy no longer requires writable current directory; it always
wenzelm@4381
  1914
reloads .ML *and* .thy file, if either one is out of date;
wenzelm@4269
  1915
paulson@3715
  1916
paulson@3715
  1917
*** Classical Reasoner ***
paulson@3715
  1918
wenzelm@3744
  1919
* Clarify_tac, clarify_tac, clarify_step_tac, Clarify_step_tac: new
wenzelm@3744
  1920
tactics that use classical reasoning to simplify a subgoal without
wenzelm@3744
  1921
splitting it into several subgoals;
paulson@3715
  1922
paulson@3719
  1923
* Safe_tac: like safe_tac but uses the default claset;
paulson@3719
  1924
paulson@3715
  1925
paulson@3715
  1926
*** Simplifier ***
paulson@3715
  1927
paulson@3715
  1928
* added simplification meta rules:
paulson@3715
  1929
    (asm_)(full_)simplify: simpset -> thm -> thm;
paulson@3715
  1930
paulson@3715
  1931
* simplifier.ML no longer part of Pure -- has to be loaded by object
paulson@3715
  1932
logics (again);
paulson@3715
  1933
paulson@3715
  1934
* added prems argument to simplification procedures;
paulson@3715
  1935
paulson@4325
  1936
* HOL, FOL, ZF: added infix function `addsplits':
paulson@4325
  1937
  instead of `<simpset> setloop (split_tac <thms>)'
paulson@4325
  1938
  you can simply write `<simpset> addsplits <thms>'
paulson@4325
  1939
paulson@3715
  1940
paulson@3715
  1941
*** Syntax ***
paulson@3715
  1942
wenzelm@4174
  1943
* TYPE('a) syntax for type reflection terms;
wenzelm@4174
  1944
wenzelm@3985
  1945
* no longer handles consts with name "" -- declare as 'syntax' instead;
paulson@3856
  1946
paulson@3856
  1947
* pretty printer: changed order of mixfix annotation preference (again!);
wenzelm@3846
  1948
paulson@3715
  1949
* Pure: fixed idt/idts vs. pttrn/pttrns syntactic categories;
paulson@3715
  1950
paulson@3715
  1951
paulson@3715
  1952
*** HOL ***
paulson@3715
  1953
wenzelm@5726
  1954
* HOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  1955
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
  1956
nipkow@4035
  1957
* HOL/TLA: Stephan Merz's formalization of Lamport's Temporal Logic of Actions;
wenzelm@3985
  1958
wenzelm@3985
  1959
* HOL/Auth: new protocol proofs including some for the Internet
nipkow@4035
  1960
  protocol TLS;
wenzelm@3985
  1961
wenzelm@4125
  1962
* HOL/Map: new theory of `maps' a la VDM;
nipkow@3982
  1963
wenzelm@4335
  1964
* HOL/simplifier: simplification procedures nat_cancel_sums for
wenzelm@4335
  1965
cancelling out common nat summands from =, <, <= (in)equalities, or
wenzelm@4335
  1966
differences; simplification procedures nat_cancel_factor for
wenzelm@4335
  1967
cancelling common factor from =, <, <= (in)equalities over natural
wenzelm@4373
  1968
sums; nat_cancel contains both kinds of procedures, it is installed by
wenzelm@4373
  1969
default in Arith.thy -- this COULD MAKE EXISTING PROOFS FAIL;
wenzelm@4335
  1970
nipkow@3580
  1971
* HOL/simplifier: terms of the form
paulson@4325
  1972
  `? x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x)'  (or t=x)
nipkow@3580
  1973
  are rewritten to
nipkow@4035
  1974
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t)',
nipkow@4035
  1975
  and those of the form
paulson@4325
  1976
  `! x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x) --> R(x)'  (or t=x)
nipkow@4035
  1977
  are rewritten to
nipkow@4035
  1978
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t) --> R(t)',
nipkow@4035
  1979
nipkow@4035
  1980
* HOL/datatype
nipkow@4035
  1981
  Each datatype `t' now comes with a theorem `split_t_case' of the form
nipkow@3580
  1982
nipkow@4035
  1983
  P(t_case f1 ... fn x) =
nipkow@4035
  1984
     ( (!y1 ... ym1. x = C1 y1 ... ym1 --> P(f1 y1 ... ym1)) &
nipkow@4035
  1985
        ...
oheimb@4189
  1986
       (!y1 ... ymn. x = Cn y1 ... ymn --> P(f1 y1 ... ymn))
nipkow@4035
  1987
     )
nipkow@4035
  1988
oheimb@4930
  1989
  and a theorem `split_t_case_asm' of the form
oheimb@4189
  1990
oheimb@4189
  1991
  P(t_case f1 ... fn x) =
oheimb@4189
  1992
    ~( (? y1 ... ym1. x = C1 y1 ... ym1 & ~P(f1 y1 ... ym1)) |
oheimb@4189
  1993
        ...
oheimb@4189
  1994
       (? y1 ... ymn. x = Cn y1 ... ymn & ~P(f1 y1 ... ymn))
oheimb@4189
  1995
     )
oheimb@4930
  1996
  which can be added to a simpset via `addsplits'. The existing theorems
oheimb@4930
  1997
  expand_list_case and expand_option_case have been renamed to
oheimb@4930
  1998
  split_list_case and split_option_case.
oheimb@4189
  1999
nipkow@4361
  2000
* HOL/Arithmetic:
nipkow@4361
  2001
  - `pred n' is automatically converted to `n-1'.
nipkow@4361
  2002
    Users are strongly encouraged not to use `pred' any longer,
nipkow@4361
  2003
    because it will disappear altogether at some point.
nipkow@4361
  2004
  - Users are strongly encouraged to write "0 < n" rather than
nipkow@4361
  2005
    "n ~= 0". Theorems and proof tools have been modified towards this
nipkow@4361
  2006
    `standard'.
nipkow@4357
  2007
nipkow@4502
  2008
* HOL/Lists:
nipkow@4502
  2009
  the function "set_of_list" has been renamed "set" (and its theorems too);
nipkow@4502
  2010
  the function "nth" now takes its arguments in the reverse order and
nipkow@4502
  2011
  has acquired the infix notation "!" as in "xs!n".
paulson@3570
  2012
paulson@4154
  2013
* HOL/Set: UNIV is now a constant and is no longer translated to Compl{};
paulson@4154
  2014
paulson@4154
  2015
* HOL/Set: The operator (UN x.B x) now abbreviates (UN x:UNIV. B x) and its
paulson@4154
  2016
  specialist theorems (like UN1_I) are gone.  Similarly for (INT x.B x);
paulson@4154
  2017
wenzelm@4575
  2018
* HOL/record: extensible records with schematic structural subtyping
wenzelm@4575
  2019
(single inheritance); EXPERIMENTAL version demonstrating the encoding,
wenzelm@4575
  2020
still lacks various theorems and concrete record syntax;
wenzelm@4575
  2021
wenzelm@4125
  2022
paulson@3715
  2023
*** HOLCF ***
wenzelm@3535
  2024
wenzelm@4125
  2025
* removed "axioms" and "generated by" sections;
wenzelm@4125
  2026
oheimb@4123
  2027
* replaced "ops" section by extended "consts" section, which is capable of
wenzelm@4125
  2028
  handling the continuous function space "->" directly;
wenzelm@4125
  2029
wenzelm@4125
  2030
* domain package:
wenzelm@4125
  2031
  . proves theorems immediately and stores them in the theory,
wenzelm@4125
  2032
  . creates hierachical name space,
wenzelm@4125
  2033
  . now uses normal mixfix annotations (instead of cinfix...),
wenzelm@4125
  2034
  . minor changes to some names and values (for consistency),
wenzelm@4125
  2035
  . e.g. cases -> casedist, dists_eq -> dist_eqs, [take_lemma] -> take_lemmas,
wenzelm@4125
  2036
  . separator between mutual domain defs: changed "," to "and",
wenzelm@4125
  2037
  . improved handling of sort constraints;  now they have to
wenzelm@4125
  2038
    appear on the left-hand side of the equations only;
oheimb@4123
  2039
oheimb@4123
  2040
* fixed LAM <x,y,zs>.b syntax;
wenzelm@3567
  2041
wenzelm@3744
  2042
* added extended adm_tac to simplifier in HOLCF -- can now discharge
wenzelm@3744
  2043
adm (%x. P (t x)), where P is chainfinite and t continuous;
wenzelm@3579
  2044
wenzelm@3579
  2045
paulson@3719
  2046
*** FOL and ZF ***
paulson@3719
  2047
wenzelm@5726
  2048
* FOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  2049
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
  2050
wenzelm@3744
  2051
* qed_spec_mp, qed_goal_spec_mp, qed_goalw_spec_mp are available, as
wenzelm@3744
  2052
in HOL, they strip ALL and --> from proved theorems;
wenzelm@3744
  2053
paulson@3719
  2054
wenzelm@3579
  2055
wenzelm@3006
  2056
New in Isabelle94-8 (May 1997)
wenzelm@3006
  2057
------------------------------
wenzelm@2654
  2058
paulson@3002
  2059
*** General Changes ***
paulson@3002
  2060
paulson@3002
  2061
* new utilities to build / run / maintain Isabelle etc. (in parts
paulson@3002
  2062
still somewhat experimental); old Makefiles etc. still functional;
wenzelm@2971
  2063
wenzelm@3205
  2064
* new 'Isabelle System Manual';
wenzelm@3205
  2065
wenzelm@2825
  2066
* INSTALL text, together with ./configure and ./build scripts;
wenzelm@2773
  2067
wenzelm@3006
  2068
* reimplemented type inference for greater efficiency, better error
wenzelm@3006
  2069
messages and clean internal interface;
paulson@3002
  2070
paulson@3002
  2071
* prlim command for dealing with lots of subgoals (an easier way of
paulson@3002
  2072
setting goals_limit);
paulson@3002
  2073
wenzelm@3006
  2074
wenzelm@3006
  2075
*** Syntax ***
paulson@3002
  2076
wenzelm@3116
  2077
* supports alternative (named) syntax tables (parser and pretty
wenzelm@3116
  2078
printer); internal interface is provided by add_modesyntax(_i);
wenzelm@3116
  2079
paulson@3002
  2080
* Pure, FOL, ZF, HOL, HOLCF now support symbolic input and output; to
paulson@3002
  2081
be used in conjunction with the Isabelle symbol font; uses the
paulson@3002
  2082
"symbols" syntax table;
paulson@3002
  2083
wenzelm@2705
  2084
* added token_translation interface (may translate name tokens in
wenzelm@2756
  2085
arbitrary ways, dependent on their type (free, bound, tfree, ...) and
wenzelm@3116
  2086
the current print_mode); IMPORTANT: user print translation functions
wenzelm@3116
  2087
are responsible for marking newly introduced bounds
wenzelm@3116
  2088
(Syntax.mark_boundT);
wenzelm@2705
  2089
wenzelm@2730
  2090
* token translations for modes "xterm" and "xterm_color" that display
wenzelm@3006
  2091
names in bold, underline etc. or colors (which requires a color
wenzelm@3006
  2092
version of xterm);
wenzelm@2730
  2093
paulson@3002
  2094
* infixes may now be declared with names independent of their syntax;
paulson@3002
  2095
paulson@3002
  2096
* added typed_print_translation (like print_translation, but may
paulson@3002
  2097
access type of constant);
paulson@3002
  2098
wenzelm@3006
  2099
paulson@3002
  2100
*** Classical Reasoner ***
paulson@3002
  2101
paulson@3002
  2102
Blast_tac: a new tactic!  It is often more powerful than fast_tac, but has
paulson@3002
  2103
some limitations.  Blast_tac...
paulson@3002
  2104
  + ignores addss, addbefore, addafter; this restriction is intrinsic
paulson@3002
  2105
  + ignores elimination rules that don't have the correct format
wenzelm@5726
  2106
        (the conclusion MUST be a formula variable)
paulson@3002
  2107
  + ignores types, which can make HOL proofs fail
paulson@3002
  2108
  + rules must not require higher-order unification, e.g. apply_type in ZF
paulson@3002
  2109
    [message "Function Var's argument not a bound variable" relates to this]
paulson@3002
  2110
  + its proof strategy is more general but can actually be slower
paulson@3002
  2111
wenzelm@3107
  2112
* substitution with equality assumptions no longer permutes other
wenzelm@3107
  2113
assumptions;
paulson@3002
  2114
paulson@3002
  2115
* minor changes in semantics of addafter (now called addaltern); renamed
paulson@3002
  2116
setwrapper to setWrapper and compwrapper to compWrapper; added safe wrapper
wenzelm@3107
  2117
(and access functions for it);
paulson@3002
  2118
wenzelm@5726
  2119
* improved combination of classical reasoner and simplifier:
oheimb@3317
  2120
  + functions for handling clasimpsets
oheimb@3317
  2121
  + improvement of addss: now the simplifier is called _after_ the
oheimb@3317
  2122
    safe steps.
oheimb@3317
  2123
  + safe variant of addss called addSss: uses safe simplifications
wenzelm@5726
  2124
    _during_ the safe steps. It is more complete as it allows multiple
oheimb@3317
  2125
    instantiations of unknowns (e.g. with slow_tac).
wenzelm@3006
  2126
paulson@3002
  2127
*** Simplifier ***
paulson@3002
  2128
wenzelm@3006
  2129
* added interface for simplification procedures (functions that
wenzelm@3006
  2130
produce *proven* rewrite rules on the fly, depending on current
wenzelm@3006
  2131
redex);
wenzelm@3006
  2132
wenzelm@3006
  2133
* ordering on terms as parameter (used for ordered rewriting);
wenzelm@3006
  2134
wenzelm@3107
  2135
* new functions delcongs, deleqcongs, and Delcongs. richer rep_ss;
paulson@3002
  2136
paulson@3002
  2137
* the solver is now split into a safe and an unsafe part.
paulson@3002
  2138
This should be invisible for the normal user, except that the
paulson@3002
  2139
functions setsolver and addsolver have been renamed to setSolver and
wenzelm@3107
  2140
addSolver; added safe_asm_full_simp_tac;
paulson@3002
  2141
paulson@3002
  2142
paulson@3002
  2143
*** HOL ***
paulson@3002
  2144
nipkow@3042
  2145
* a generic induction tactic `induct_tac' which works for all datatypes and
wenzelm@3107
  2146
also for type `nat';
nipkow@3042
  2147
nipkow@3316
  2148
* a generic case distinction tactic `exhaust_tac' which works for all
nipkow@3316
  2149
datatypes and also for type `nat';
nipkow@3316
  2150
nipkow@3316
  2151
* each datatype comes with a function `size';
nipkow@3316
  2152
paulson@3002
  2153
* patterns in case expressions allow tuple patterns as arguments to
wenzelm@3107
  2154
constructors, for example `case x of [] => ... | (x,y,z)#ps => ...';
paulson@3002
  2155
paulson@3002
  2156
* primrec now also works with type nat;
paulson@3002
  2157
paulson@3338
  2158
* recdef: a new declaration form, allows general recursive functions to be
paulson@3338
  2159
defined in theory files.  See HOL/ex/Fib, HOL/ex/Primes, HOL/Subst/Unify.
paulson@3338
  2160
paulson@3002
  2161
* the constant for negation has been renamed from "not" to "Not" to
wenzelm@3107
  2162
harmonize with FOL, ZF, LK, etc.;
paulson@3002
  2163
wenzelm@3107
  2164
* HOL/ex/LFilter theory of a corecursive "filter" functional for
wenzelm@3107
  2165
infinite lists;
paulson@3002
  2166
wenzelm@3227
  2167
* HOL/Modelcheck demonstrates invocation of model checker oracle;
wenzelm@3227
  2168
paulson@3002
  2169
* HOL/ex/Ring.thy declares cring_simp, which solves equational
paulson@3002
  2170
problems in commutative rings, using axiomatic type classes for + and *;
paulson@3002
  2171
paulson@3002
  2172
* more examples in HOL/MiniML and HOL/Auth;
paulson@3002
  2173
paulson@3002
  2174
* more default rewrite rules for quantifiers, union/intersection;
paulson@3002
  2175
nipkow@3321
  2176
* a new constant `arbitrary == @x.False';
nipkow@3321
  2177
wenzelm@3107
  2178
* HOLCF/IOA replaces old HOL/IOA;
wenzelm@3107
  2179
wenzelm@5726
  2180
* HOLCF changes: derived all rules and arities
wenzelm@5726
  2181
  + axiomatic type classes instead of classes
slotosch@2653
  2182
  + typedef instead of faking type definitions
paulson@2747
  2183
  + eliminated the internal constants less_fun, less_cfun, UU_fun, UU_cfun etc.
wenzelm@2730
  2184
  + new axclasses cpo, chfin, flat with flat < chfin < pcpo < cpo < po
slotosch@2653
  2185
  + eliminated the types void, one, tr
slotosch@2653
  2186
  + use unit lift and bool lift (with translations) instead of one and tr
slotosch@2653
  2187
  + eliminated blift from Lift3.thy (use Def instead of blift)
wenzelm@3107
  2188
  all eliminated rules are derived as theorems --> no visible changes ;
oheimb@2649
  2189
wenzelm@3006
  2190
paulson@3002
  2191
*** ZF ***
wenzelm@2553
  2192
paulson@2865
  2193
* ZF now has Fast_tac, Simp_tac and Auto_tac.  Union_iff is a now a default
paulson@2865
  2194
rewrite rule; this may affect some proofs.  eq_cs is gone but can be put back
paulson@2865
  2195
as ZF_cs addSIs [equalityI];
wenzelm@2553
  2196
wenzelm@2554
  2197
wenzelm@2732
  2198
wenzelm@2553
  2199
New in Isabelle94-7 (November 96)
wenzelm@2553
  2200
---------------------------------
wenzelm@2553
  2201
wenzelm@2553
  2202
* allowing negative levels (as offsets) in prlev and choplev;
wenzelm@2553
  2203
wenzelm@2554
  2204
* super-linear speedup for large simplifications;
wenzelm@2554
  2205
wenzelm@2554
  2206
* FOL, ZF and HOL now use miniscoping: rewriting pushes
wenzelm@2554
  2207
quantifications in as far as possible (COULD MAKE EXISTING PROOFS
wenzelm@2554
  2208
FAIL); can suppress it using the command Delsimps (ex_simps @
wenzelm@2554
  2209
all_simps); De Morgan laws are also now included, by default;
wenzelm@2554
  2210
wenzelm@2554
  2211
* improved printing of ==>  :  ~:
wenzelm@2554
  2212
wenzelm@2554
  2213
* new object-logic "Sequents" adds linear logic, while replacing LK
wenzelm@2554
  2214
and Modal (thanks to Sara Kalvala);
wenzelm@2554
  2215
wenzelm@2554
  2216
* HOL/Auth: correctness proofs for authentication protocols;
wenzelm@2554
  2217
wenzelm@2554
  2218
* HOL: new auto_tac combines rewriting and classical reasoning (many
wenzelm@2554
  2219
examples on HOL/Auth);
wenzelm@2554
  2220
wenzelm@2554
  2221
* HOL: new command AddIffs for declaring theorems of the form P=Q to
wenzelm@2554
  2222
the rewriter and classical reasoner simultaneously;
wenzelm@2554
  2223
wenzelm@2554
  2224
* function uresult no longer returns theorems in "standard" format;
wenzelm@2554
  2225
regain previous version by: val uresult = standard o uresult;
wenzelm@2554
  2226
wenzelm@2554
  2227
wenzelm@2554
  2228
wenzelm@2554
  2229
New in Isabelle94-6
wenzelm@2554
  2230
-------------------
wenzelm@2554
  2231
wenzelm@2554
  2232
* oracles -- these establish an interface between Isabelle and trusted
wenzelm@2554
  2233
external reasoners, which may deliver results as theorems;
wenzelm@2554
  2234
wenzelm@2554
  2235
* proof objects (in particular record all uses of oracles);
wenzelm@2554
  2236
wenzelm@2554
  2237
* Simp_tac, Fast_tac, etc. that refer to implicit simpset / claset;
wenzelm@2554
  2238
wenzelm@2554
  2239
* "constdefs" section in theory files;
wenzelm@2554
  2240
wenzelm@2554
  2241
* "primrec" section (HOL) no longer requires names;
wenzelm@2554
  2242
wenzelm@2554
  2243
* internal type "tactic" now simply "thm -> thm Sequence.seq";
wenzelm@2554
  2244
wenzelm@2554
  2245
wenzelm@2554
  2246
wenzelm@2554
  2247
New in Isabelle94-5
wenzelm@2554
  2248
-------------------
wenzelm@2554
  2249
wenzelm@2554
  2250
* reduced space requirements;
wenzelm@2554
  2251
wenzelm@2554
  2252
* automatic HTML generation from theories;
wenzelm@2554
  2253
wenzelm@2554
  2254
* theory files no longer require "..." (quotes) around most types;
wenzelm@2554
  2255
wenzelm@2554
  2256
* new examples, including two proofs of the Church-Rosser theorem;
wenzelm@2554
  2257
wenzelm@2554
  2258
* non-curried (1994) version of HOL is no longer distributed;
wenzelm@2554
  2259
wenzelm@2553
  2260
paulson@2557
  2261
paulson@2557
  2262
New in Isabelle94-4
paulson@2557
  2263
-------------------
paulson@2557
  2264
paulson@2747
  2265
* greatly reduced space requirements;
paulson@2557
  2266
paulson@2557
  2267
* theory files (.thy) no longer require \...\ escapes at line breaks;
paulson@2557
  2268
wenzelm@5726
  2269
* searchable theorem database (see the section "Retrieving theorems" on
paulson@2557
  2270
page 8 of the Reference Manual);
paulson@2557
  2271
paulson@2557
  2272
* new examples, including Grabczewski's monumental case study of the
paulson@2557
  2273
Axiom of Choice;
paulson@2557
  2274
paulson@2557
  2275
* The previous version of HOL renamed to Old_HOL;
paulson@2557
  2276
wenzelm@5726
  2277
* The new version of HOL (previously called CHOL) uses a curried syntax
paulson@2557
  2278
for functions.  Application looks like f a b instead of f(a,b);
paulson@2557
  2279
paulson@2557
  2280
* Mutually recursive inductive definitions finally work in HOL;
paulson@2557
  2281
paulson@2557
  2282
* In ZF, pattern-matching on tuples is now available in all abstractions and
paulson@2557
  2283
translates to the operator "split";
paulson@2557
  2284
paulson@2557
  2285
paulson@2557
  2286
paulson@2557
  2287
New in Isabelle94-3
paulson@2557
  2288
-------------------
paulson@2557
  2289
wenzelm@5726
  2290
* new infix operator, addss, allowing the classical reasoner to
paulson@2557
  2291
perform simplification at each step of its search.  Example:
wenzelm@5726
  2292
        fast_tac (cs addss ss)
paulson@2557
  2293
wenzelm@5726
  2294
* a new logic, CHOL, the same as HOL, but with a curried syntax
wenzelm@5726
  2295
for functions.  Application looks like f a b instead of f(a,b).  Also pairs
paulson@2557
  2296
look like (a,b) instead of <a,b>;
paulson@2557
  2297
paulson@2557
  2298
* PLEASE NOTE: CHOL will eventually replace HOL!
paulson@2557
  2299
paulson@2557
  2300
* In CHOL, pattern-matching on tuples is now available in all abstractions.
paulson@2557
  2301
It translates to the operator "split".  A new theory of integers is available;
paulson@2557
  2302
paulson@2557
  2303
* In ZF, integer numerals now denote two's-complement binary integers.
paulson@2557
  2304
Arithmetic operations can be performed by rewriting.  See ZF/ex/Bin.ML;
paulson@2557
  2305
wenzelm@5726
  2306
* Many new examples: I/O automata, Church-Rosser theorem, equivalents
paulson@2557
  2307
of the Axiom of Choice;
paulson@2557
  2308
paulson@2557
  2309
paulson@2557
  2310
paulson@2557
  2311
New in Isabelle94-2
paulson@2557
  2312
-------------------
paulson@2557
  2313
wenzelm@5726
  2314
* Significantly faster resolution;
paulson@2557
  2315
paulson@2557
  2316
* the different sections in a .thy file can now be mixed and repeated
paulson@2557
  2317
freely;
paulson@2557
  2318
paulson@2557
  2319
* Database of theorems for FOL, HOL and ZF.  New
paulson@2557
  2320
commands including qed, qed_goal and bind_thm store theorems in the database.
paulson@2557
  2321
paulson@2557
  2322
* Simple database queries: return a named theorem (get_thm) or all theorems of
paulson@2557
  2323
a given theory (thms_of), or find out what theory a theorem was proved in
paulson@2557
  2324
(theory_of_thm);
paulson@2557
  2325
paulson@2557
  2326
* Bugs fixed in the inductive definition and datatype packages;
paulson@2557
  2327
paulson@2557
  2328
* The classical reasoner provides deepen_tac and depth_tac, making FOL_dup_cs
paulson@2557
  2329
and HOL_dup_cs obsolete;
paulson@2557
  2330
paulson@2557
  2331
* Syntactic ambiguities caused by the new treatment of syntax in Isabelle94-1
paulson@2557
  2332
have been removed;
paulson@2557
  2333
paulson@2557
  2334
* Simpler definition of function space in ZF;
paulson@2557
  2335
paulson@2557
  2336
* new results about cardinal and ordinal arithmetic in ZF;
paulson@2557
  2337
paulson@2557
  2338
* 'subtype' facility in HOL for introducing new types as subsets of existing
paulson@2557
  2339
types;
paulson@2557
  2340
paulson@2557
  2341
wenzelm@2553
  2342
$Id$