NEWS
author wenzelm
Tue Jul 02 15:54:21 2002 +0200 (2002-07-02)
changeset 13280 306ef3aef61b
parent 13190 172f65d0c3d1
child 13284 20c818c966e6
permissions -rw-r--r--
* improved thms_containing: proper indexing of facts instead of raw
theorems; check validity of results wrt. current name space; include
local facts of proof configuration (also covers active locales);
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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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* improved thms_containing: proper indexing of facts instead of raw
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theorems; check validity of results wrt. current name space; include
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local facts of proof configuration (also covers active locales);
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*** HOL ***
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* arith(_tac) does now know about div k and mod k where k is a numeral of
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  type nat. It can solve simple goals like "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:
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  it now takes ~= in premises into account (by performing a case split).
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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
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in typings (of consts etc.); internally the class is called
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"HOL.type", ML programs should refer to HOLogic.typeS;
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* HOL/record package improvements:
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  - new derived operations "fields" to build a partial record section,
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    "extend" to promote a fixed record to a record scheme, and
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    "truncate" for the reverse; cf. theorems "xxx.defs", which are *not*
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    declared as simp by default;
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  - shared operations ("more", "fields", etc.) now need to be always
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    qualified) --- potential INCOMPATIBILITY;
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  - removed "make_scheme" operations (use "make" with "extend") --
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    INCOMPATIBILITY;
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  - removed "more" class (simply use "term") -- INCOMPATIBILITY;
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  - provides cases/induct rules for use with corresponding Isar
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    methods (for concrete records, record schemes, concrete more
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    parts, and schematic more parts -- in that order);
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  - internal definitions directly based on a light-weight abstract
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    theory of product types over typedef rather than datatype;
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* HOL: generic code generator for generating executable ML code from
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specifications; specific support for HOL constructs such as inductive
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datatypes and sets, as well as recursive functions; can be invoked
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via 'generate_code' theory section;
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* HOL: canonical cases/induct rules for n-tuples (n = 3..7);
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* HOL: concrete setsum syntax "\<Sum>i:A. b" == "setsum (%i. b) A"
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(beware of argument permutation!);
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* HOL: linorder_less_split superseded by linorder_cases;
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* HOL/List: "nodups" renamed to "distinct";
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* HOL: added "The" definite description operator; move Hilbert's "Eps"
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to peripheral theory "Hilbert_Choice";
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* HOL: made split_all_tac safe; EXISTING PROOFS MAY FAIL OR LOOP, so
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in this (rare) case use:
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  delSWrapper "split_all_tac"
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  addSbefore ("unsafe_split_all_tac", unsafe_split_all_tac)
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* HOL: added safe wrapper "split_conv_tac" to claset; EXISTING PROOFS
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MAY FAIL;
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* HOL: introduced f^n = f o ... o f; warning: due to the limits of
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Isabelle's type classes, ^ on functions and relations has too general
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a domain, namely ('a * 'b) set and 'a => 'b; this means that it may be
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necessary to attach explicit type constraints;
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* HOL/Relation: the prefix name of the infix "O" has been changed from
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"comp" to "rel_comp"; INCOMPATIBILITY: a few theorems have been
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renamed accordingly (eg "compI" -> "rel_compI").
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* HOL: syntax translations now work properly with numerals and records
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expressions;
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* HOL: bounded abstraction now uses syntax "%" / "\<lambda>" instead
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of "lam" -- INCOMPATIBILITY;
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* HOL: got rid of some global declarations (potential INCOMPATIBILITY
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for ML tools): const "()" renamed "Product_Type.Unity", type "unit"
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renamed "Product_Type.unit";
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* HOL: renamed rtrancl_into_rtrancl2 to converse_rtrancl_into_rtrancl
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* HOL: removed obsolete theorem "optionE" (use "option.exhaust", or
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the "cases" method);
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* HOL/GroupTheory: group theory examples including Sylow's theorem (by
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Florian Kammüller);
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* HOL/IMP: updated and converted to new-style theory format; several
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parts turned into readable document, with proper Isar proof texts and
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some explanations (by Gerwin Klein);
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* HOL-Real: added Complex_Numbers (by Gertrud Bauer);
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* HOL-Hyperreal is now a logic image;
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*** HOLCF ***
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* Isar: consts/constdefs supports mixfix syntax for continuous
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operations;
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* Isar: domain package adapted to new-style theory format, e.g. see
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HOLCF/ex/Dnat.thy;
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* theory Lift: proper use of rep_datatype lift instead of ML hacks --
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potential INCOMPATIBILITY; now use plain induct_tac instead of former
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lift.induct_tac, always use UU instead of Undef;
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* HOLCF/IMP: updated and converted to new-style theory;
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*** ZF ***
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* Isar: proper integration of logic-specific tools and packages,
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including theory commands '(co)inductive', '(co)datatype',
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'rep_datatype', 'inductive_cases', as well as methods 'ind_cases',
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'induct_tac', 'case_tac', and 'typecheck' (with attribute 'TC');
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* theory Main no longer includes AC; for the Axiom of Choice, base
wenzelm@12622
   346
your theory on Main_ZFC;
wenzelm@12622
   347
wenzelm@12622
   348
* the integer library now covers quotients and remainders, with many
wenzelm@12622
   349
laws relating division to addition, multiplication, etc.;
paulson@12563
   350
wenzelm@12280
   351
* ZF/UNITY: Chandy and Misra's UNITY is now available in ZF, giving a
wenzelm@12280
   352
typeless version of the formalism;
wenzelm@12280
   353
wenzelm@13025
   354
* ZF/AC, Coind, IMP, Resid: updated and converted to new-style theory
wenzelm@13025
   355
format;
wenzelm@12608
   356
wenzelm@12280
   357
* ZF/Induct: new directory for examples of inductive definitions,
wenzelm@12608
   358
including theory Multiset for multiset orderings; converted to
wenzelm@12608
   359
new-style theory format;
wenzelm@12177
   360
wenzelm@13025
   361
* ZF: many new theorems about lists, ordinals, etc.;
paulson@12850
   362
wenzelm@11474
   363
wenzelm@11474
   364
*** General ***
wenzelm@11474
   365
wenzelm@12280
   366
* Pure/kernel: meta-level proof terms (by Stefan Berghofer); reference
wenzelm@12280
   367
variable proof controls level of detail: 0 = no proofs (only oracle
wenzelm@12280
   368
dependencies), 1 = lemma dependencies, 2 = compact proof terms; see
wenzelm@12280
   369
also ref manual for further ML interfaces;
wenzelm@12280
   370
wenzelm@12280
   371
* Pure/axclass: removed obsolete ML interface
wenzelm@12280
   372
goal_subclass/goal_arity;
wenzelm@12280
   373
wenzelm@12280
   374
* Pure/syntax: new token syntax "num" for plain numerals (without "#"
wenzelm@12280
   375
of "xnum"); potential INCOMPATIBILITY, since -0, -1 etc. are now
wenzelm@12280
   376
separate tokens, so expressions involving minus need to be spaced
wenzelm@12280
   377
properly;
wenzelm@12280
   378
wenzelm@12312
   379
* Pure/syntax: support non-oriented infixes, using keyword "infix"
wenzelm@12312
   380
rather than "infixl" or "infixr";
wenzelm@12312
   381
wenzelm@12312
   382
* Pure/syntax: concrete syntax for dummy type variables admits genuine
wenzelm@12312
   383
sort constraint specifications in type inference; e.g. "x::_::foo"
wenzelm@12312
   384
ensures that the type of "x" is of sort "foo" (but not necessarily a
wenzelm@12312
   385
type variable);
wenzelm@12280
   386
wenzelm@12280
   387
* Pure/syntax: print modes "type_brackets" and "no_type_brackets"
wenzelm@12280
   388
control output of nested => (types); the default behavior is
wenzelm@12280
   389
"type_brackets";
wenzelm@12280
   390
wenzelm@12280
   391
* Pure/syntax: builtin parse translation for "_constify" turns valued
wenzelm@11817
   392
tokens into AST constants;
wenzelm@11474
   393
wenzelm@12280
   394
* Pure/syntax: prefer later declarations of translations and print
wenzelm@12280
   395
translation functions; potential INCOMPATIBILITY: need to reverse
wenzelm@12280
   396
multiple declarations for same syntax element constant;
wenzelm@12280
   397
wenzelm@12832
   398
* Pure/show_hyps reset by default (in accordance to existing Isar
wenzelm@12832
   399
practice);
wenzelm@12832
   400
wenzelm@12280
   401
* Provers/classical: renamed addaltern to addafter, addSaltern to
wenzelm@12280
   402
addSafter;
wenzelm@12280
   403
wenzelm@12280
   404
* Provers/clasimp: ``iff'' declarations now handle conditional rules
wenzelm@12280
   405
as well;
wenzelm@12253
   406
wenzelm@12538
   407
* system: tested support for MacOS X; should be able to get Isabelle +
wenzelm@12538
   408
Proof General to work in a plain Terminal after installing Poly/ML
wenzelm@12538
   409
(e.g. from the Isabelle distribution area) and GNU bash alone
wenzelm@12538
   410
(e.g. from http://www.apple.com); full X11, XEmacs and X-Symbol
wenzelm@12538
   411
support requires further installations, e.g. from
wenzelm@12538
   412
http://fink.sourceforge.net/);
wenzelm@12538
   413
wenzelm@12280
   414
* system: support Poly/ML 4.1.1 (able to manage larger heaps);
wenzelm@11551
   415
wenzelm@12753
   416
* system: reduced base memory usage by Poly/ML (approx. 20 MB instead
wenzelm@12753
   417
of 40 MB), cf. ML_OPTIONS;
wenzelm@12753
   418
wenzelm@11633
   419
* system: Proof General keywords specification is now part of the
wenzelm@11633
   420
Isabelle distribution (see etc/isar-keywords.el);
wenzelm@11633
   421
wenzelm@12728
   422
* system: support for persistent Proof General sessions (refrain from
wenzelm@12728
   423
outdating all loaded theories on startup); user may create writable
wenzelm@12728
   424
logic images like this: ``isabelle -q HOL Test'';
wenzelm@12597
   425
wenzelm@11551
   426
* system: smart selection of Isabelle process versus Isabelle
wenzelm@11572
   427
interface, accommodates case-insensitive file systems (e.g. HFS+); may
wenzelm@11572
   428
run both "isabelle" and "Isabelle" even if file names are badly
wenzelm@11572
   429
damaged (executable inspects the case of the first letter of its own
wenzelm@11572
   430
name); added separate "isabelle-process" and "isabelle-interface";
wenzelm@11551
   431
wenzelm@12472
   432
* system: refrain from any attempt at filtering input streams; no
wenzelm@12472
   433
longer support ``8bit'' encoding of old isabelle font, instead proper
wenzelm@12472
   434
iso-latin characters may now be used; the related isatools
wenzelm@12472
   435
"symbolinput" and "nonascii" have disappeared as well;
wenzelm@12472
   436
wenzelm@12472
   437
* system: removed old "xterm" interface (the print modes "xterm" and
wenzelm@12472
   438
"xterm_color" are still available for direct use in a suitable
wenzelm@12472
   439
terminal);
wenzelm@12472
   440
paulson@11314
   441
oheimb@11169
   442
wenzelm@11062
   443
New in Isabelle99-2 (February 2001)
wenzelm@11062
   444
-----------------------------------
wenzelm@11062
   445
nipkow@10224
   446
*** Overview of INCOMPATIBILITIES ***
nipkow@10224
   447
paulson@11241
   448
* HOL: please note that theories in the Library and elsewhere often use the
paulson@11241
   449
new-style (Isar) format; to refer to their theorems in an ML script you must
wenzelm@12622
   450
bind them to ML identifers by e.g.      val thm_name = thm "thm_name";
paulson@11241
   451
wenzelm@11043
   452
* HOL: inductive package no longer splits induction rule aggressively,
wenzelm@11043
   453
but only as far as specified by the introductions given; the old
oheimb@11130
   454
format may be recovered via ML function complete_split_rule or attribute
wenzelm@11043
   455
'split_rule (complete)';
wenzelm@11043
   456
wenzelm@10998
   457
* HOL: induct renamed to lfp_induct, lfp_Tarski to lfp_unfold,
wenzelm@10998
   458
gfp_Tarski to gfp_unfold;
nipkow@10224
   459
paulson@10288
   460
* HOL: contrapos, contrapos2 renamed to contrapos_nn, contrapos_pp;
paulson@10288
   461
wenzelm@10858
   462
* HOL: infix "dvd" now has priority 50 rather than 70 (because it is a
wenzelm@10858
   463
relation); infix "^^" has been renamed "``"; infix "``" has been
wenzelm@10858
   464
renamed "`"; "univalent" has been renamed "single_valued";
nipkow@10793
   465
wenzelm@10998
   466
* HOL/Real: "rinv" and "hrinv" replaced by overloaded "inverse"
wenzelm@10998
   467
operation;
wenzelm@10998
   468
nipkow@10868
   469
* HOLCF: infix "`" has been renamed "$"; the symbol syntax is \<cdot>;
nipkow@10856
   470
wenzelm@10391
   471
* Isar: 'obtain' no longer declares "that" fact as simp/intro;
wenzelm@10391
   472
wenzelm@10401
   473
* Isar/HOL: method 'induct' now handles non-atomic goals; as a
wenzelm@10401
   474
consequence, it is no longer monotonic wrt. the local goal context
wenzelm@10401
   475
(which is now passed through the inductive cases);
wenzelm@10401
   476
wenzelm@10976
   477
* Document preparation: renamed standard symbols \<ll> to \<lless> and
wenzelm@10976
   478
\<gg> to \<ggreater>;
wenzelm@10976
   479
nipkow@10224
   480
wenzelm@10245
   481
*** Document preparation ***
wenzelm@10245
   482
wenzelm@10858
   483
* \isabellestyle{NAME} selects version of Isabelle output (currently
wenzelm@10858
   484
available: are "it" for near math-mode best-style output, "sl" for
wenzelm@10858
   485
slanted text style, and "tt" for plain type-writer; if no
wenzelm@10858
   486
\isabellestyle command is given, output is according to slanted
wenzelm@10858
   487
type-writer);
wenzelm@10858
   488
wenzelm@10322
   489
* support sub/super scripts (for single symbols only), input syntax is
wenzelm@10322
   490
like this: "A\<^sup>*" or "A\<^sup>\<star>";
wenzelm@10322
   491
wenzelm@10858
   492
* some more standard symbols; see Appendix A of the system manual for
wenzelm@11062
   493
the complete list of symbols defined in isabellesym.sty;
wenzelm@10858
   494
wenzelm@10998
   495
* improved isabelle style files; more abstract symbol implementation
wenzelm@10998
   496
(should now use \isamath{...} and \isatext{...} in custom symbol
wenzelm@10998
   497
definitions);
wenzelm@10998
   498
wenzelm@10634
   499
* antiquotation @{goals} and @{subgoals} for output of *dynamic* goals
wenzelm@10634
   500
state; Note that presentation of goal states does not conform to
wenzelm@10634
   501
actual human-readable proof documents.  Please do not include goal
wenzelm@10634
   502
states into document output unless you really know what you are doing!
wenzelm@10322
   503
wenzelm@11062
   504
* proper indentation of antiquoted output with proportional LaTeX
wenzelm@11062
   505
fonts;
wenzelm@10862
   506
wenzelm@11050
   507
* no_document ML operator temporarily disables LaTeX document
wenzelm@11050
   508
generation;
wenzelm@11050
   509
wenzelm@11062
   510
* isatool unsymbolize tunes sources for plain ASCII communication;
wenzelm@11062
   511
wenzelm@10322
   512
wenzelm@10306
   513
*** Isar ***
wenzelm@10306
   514
wenzelm@10547
   515
* Pure: Isar now suffers initial goal statements to contain unbound
wenzelm@10547
   516
schematic variables (this does not conform to actual readable proof
wenzelm@10547
   517
documents, due to unpredictable outcome and non-compositional proof
wenzelm@10547
   518
checking); users who know what they are doing may use schematic goals
wenzelm@10547
   519
for Prolog-style synthesis of proven results;
wenzelm@10547
   520
wenzelm@10391
   521
* Pure: assumption method (an implicit finishing) now handles actual
wenzelm@10391
   522
rules as well;
wenzelm@10391
   523
wenzelm@10391
   524
* Pure: improved 'obtain' --- moved to Pure, insert "that" into
wenzelm@10391
   525
initial goal, declare "that" only as Pure intro (only for single
wenzelm@10391
   526
steps); the "that" rule assumption may now be involved in implicit
wenzelm@10391
   527
finishing, thus ".." becomes a feasible for trivial obtains;
wenzelm@10391
   528
wenzelm@10391
   529
* Pure: default proof step now includes 'intro_classes'; thus trivial
wenzelm@10391
   530
instance proofs may be performed by "..";
wenzelm@10391
   531
wenzelm@10391
   532
* Pure: ?thesis / ?this / "..." now work for pure meta-level
wenzelm@10391
   533
statements as well;
wenzelm@10306
   534
wenzelm@11097
   535
* Pure: more robust selection of calculational rules;
wenzelm@11097
   536
wenzelm@10858
   537
* Pure: the builtin notion of 'finished' goal now includes the ==-refl
wenzelm@10858
   538
rule (as well as the assumption rule);
wenzelm@10858
   539
wenzelm@10858
   540
* Pure: 'thm_deps' command visualizes dependencies of theorems and
wenzelm@10858
   541
lemmas, using the graph browser tool;
wenzelm@10858
   542
wenzelm@10944
   543
* Pure: predict failure of "show" in interactive mode;
wenzelm@10944
   544
wenzelm@11016
   545
* Pure: 'thms_containing' now takes actual terms as arguments;
wenzelm@11016
   546
wenzelm@10401
   547
* HOL: improved method 'induct' --- now handles non-atomic goals
wenzelm@10401
   548
(potential INCOMPATIBILITY); tuned error handling;
wenzelm@10401
   549
wenzelm@10557
   550
* HOL: cases and induct rules now provide explicit hints about the
wenzelm@10547
   551
number of facts to be consumed (0 for "type" and 1 for "set" rules);
wenzelm@10547
   552
any remaining facts are inserted into the goal verbatim;
wenzelm@10547
   553
wenzelm@10858
   554
* HOL: local contexts (aka cases) may now contain term bindings as
wenzelm@10858
   555
well; the 'cases' and 'induct' methods new provide a ?case binding for
wenzelm@10858
   556
the result to be shown in each case;
wenzelm@10858
   557
wenzelm@10770
   558
* HOL: added 'recdef_tc' command;
wenzelm@10770
   559
wenzelm@11016
   560
* isatool convert assists in eliminating legacy ML scripts;
wenzelm@11016
   561
wenzelm@10306
   562
wenzelm@10245
   563
*** HOL ***
wenzelm@10245
   564
wenzelm@10245
   565
* HOL/Library: a collection of generic theories to be used together
wenzelm@10245
   566
with main HOL; the theory loader path already includes this directory
wenzelm@10245
   567
by default; the following existing theories have been moved here:
wenzelm@10245
   568
HOL/Induct/Multiset, HOL/Induct/Acc (as Accessible_Part), HOL/While
wenzelm@10337
   569
(as While_Combinator), HOL/Lex/Prefix (as List_Prefix);
wenzelm@10245
   570
wenzelm@10966
   571
* HOL/Unix: "Some aspects of Unix file-system security", a typical
wenzelm@10966
   572
modelling and verification task performed in Isabelle/HOL +
wenzelm@10966
   573
Isabelle/Isar + Isabelle document preparation (by Markus Wenzel).
wenzelm@10966
   574
wenzelm@11094
   575
* HOL/Algebra: special summation operator SUM no longer exists, it has
wenzelm@11094
   576
been replaced by setsum; infix 'assoc' now has priority 50 (like
wenzelm@11094
   577
'dvd'); axiom 'one_not_zero' has been moved from axclass 'ring' to
wenzelm@11094
   578
'domain', this makes the theory consistent with mathematical
wenzelm@11094
   579
literature;
wenzelm@11094
   580
wenzelm@10514
   581
* HOL basics: added overloaded operations "inverse" and "divide"
wenzelm@10726
   582
(infix "/"), syntax for generic "abs" operation, generic summation
wenzelm@11094
   583
operator \<Sum>;
wenzelm@10452
   584
wenzelm@10391
   585
* HOL/typedef: simplified package, provide more useful rules (see also
wenzelm@10391
   586
HOL/subset.thy);
wenzelm@10391
   587
wenzelm@10915
   588
* HOL/datatype: induction rule for arbitrarily branching datatypes is
wenzelm@10915
   589
now expressed as a proper nested rule (old-style tactic scripts may
wenzelm@10915
   590
require atomize_strip_tac to cope with non-atomic premises);
wenzelm@10915
   591
wenzelm@10915
   592
* HOL: renamed theory "Prod" to "Product_Type", renamed "split" rule
wenzelm@10915
   593
to "split_conv" (old name still available for compatibility);
wenzelm@10915
   594
wenzelm@10915
   595
* HOL: improved concrete syntax for strings (e.g. allows translation
wenzelm@10915
   596
rules with string literals);
wenzelm@10915
   597
paulson@12245
   598
* HOL-Real-Hyperreal: this extends HOL-Real with the hyperreals
paulson@12245
   599
 and Fleuriot's mechanization of analysis, including the transcendental
paulson@12245
   600
 functions for the reals;
paulson@10756
   601
wenzelm@11094
   602
* HOL/Real, HOL/Hyperreal: improved arithmetic simplification;
wenzelm@10391
   603
wenzelm@10858
   604
paulson@10474
   605
*** CTT ***
paulson@10474
   606
wenzelm@10547
   607
* CTT: x-symbol support for Pi, Sigma, -->, : (membership); note that
wenzelm@10547
   608
"lam" is displayed as TWO lambda-symbols
paulson@10474
   609
wenzelm@10547
   610
* CTT: theory Main now available, containing everything (that is, Bool
wenzelm@10547
   611
and Arith);
wenzelm@10547
   612
paulson@10474
   613
wenzelm@10391
   614
*** General ***
wenzelm@10391
   615
wenzelm@10547
   616
* Pure: the Simplifier has been implemented properly as a derived rule
wenzelm@10547
   617
outside of the actual kernel (at last!); the overall performance
wenzelm@10547
   618
penalty in practical applications is about 50%, while reliability of
wenzelm@10547
   619
the Isabelle inference kernel has been greatly improved;
wenzelm@10547
   620
wenzelm@11112
   621
* print modes "brackets" and "no_brackets" control output of nested =>
wenzelm@11112
   622
(types) and ==> (props); the default behaviour is "brackets";
wenzelm@11112
   623
wenzelm@10391
   624
* Provers: fast_tac (and friends) now handle actual object-logic rules
wenzelm@10391
   625
as assumptions as well;
wenzelm@10391
   626
wenzelm@11124
   627
* system: support Poly/ML 4.0;
wenzelm@11124
   628
wenzelm@11124
   629
* system: isatool install handles KDE version 1 or 2;
wenzelm@11124
   630
wenzelm@10391
   631
wenzelm@10245
   632
wenzelm@10103
   633
New in Isabelle99-1 (October 2000)
wenzelm@10103
   634
----------------------------------
wenzelm@8015
   635
wenzelm@10003
   636
*** Overview of INCOMPATIBILITIES ***
paulson@8014
   637
wenzelm@8848
   638
* HOL: simplification of natural numbers is much changed; to partly
wenzelm@8848
   639
recover the old behaviour (e.g. to prevent n+n rewriting to #2*n)
wenzelm@8848
   640
issue the following ML commands:
wenzelm@8848
   641
wenzelm@8848
   642
  Delsimprocs Nat_Numeral_Simprocs.cancel_numerals;
wenzelm@8848
   643
  Delsimprocs [Nat_Numeral_Simprocs.combine_numerals];
paulson@8788
   644
wenzelm@10129
   645
* HOL: simplification no longer dives into case-expressions; this is
wenzelm@10129
   646
controlled by "t.weak_case_cong" for each datatype t;
wenzelm@10003
   647
wenzelm@10003
   648
* HOL: nat_less_induct renamed to less_induct;
wenzelm@10003
   649
wenzelm@10003
   650
* HOL: systematic renaming of the SOME (Eps) rules, may use isatool
wenzelm@10003
   651
fixsome to patch .thy and .ML sources automatically;
paulson@8967
   652
wenzelm@10003
   653
  select_equality  -> some_equality
wenzelm@10003
   654
  select_eq_Ex     -> some_eq_ex
wenzelm@10003
   655
  selectI2EX       -> someI2_ex
wenzelm@10003
   656
  selectI2         -> someI2
wenzelm@10003
   657
  selectI          -> someI
wenzelm@10003
   658
  select1_equality -> some1_equality
wenzelm@10003
   659
  Eps_sym_eq       -> some_sym_eq_trivial
wenzelm@10003
   660
  Eps_eq           -> some_eq_trivial
wenzelm@10003
   661
wenzelm@10003
   662
* HOL: exhaust_tac on datatypes superceded by new generic case_tac;
wenzelm@10003
   663
wenzelm@10003
   664
* HOL: removed obsolete theorem binding expand_if (refer to split_if
wenzelm@10003
   665
instead);
wenzelm@10003
   666
wenzelm@10003
   667
* HOL: the recursion equations generated by 'recdef' are now called
wenzelm@10003
   668
f.simps instead of f.rules;
wenzelm@10003
   669
wenzelm@10003
   670
* HOL: qed_spec_mp now also handles bounded ALL as well;
wenzelm@10003
   671
wenzelm@10003
   672
* HOL: 0 is now overloaded, so the type constraint ":: nat" may
wenzelm@10003
   673
sometimes be needed;
wenzelm@10003
   674
wenzelm@10003
   675
* HOL: the constant for "f``x" is now "image" rather than "op ``";
paulson@8014
   676
paulson@10065
   677
* HOL: the constant for "f-``x" is now "vimage" rather than "op -``";
paulson@10065
   678
wenzelm@9330
   679
* HOL: the disjoint sum is now "<+>" instead of "Plus"; the cartesian
wenzelm@9330
   680
product is now "<*>" instead of "Times"; the lexicographic product is
wenzelm@9330
   681
now "<*lex*>" instead of "**";
nipkow@8705
   682
wenzelm@10003
   683
* HOL: theory Sexp is now in HOL/Induct examples (it used to be part
wenzelm@10003
   684
of main HOL, but was unused); better use HOL's datatype package;
paulson@9971
   685
wenzelm@10137
   686
* HOL: removed "symbols" syntax for constant "override" of theory Map;
wenzelm@10137
   687
the old syntax may be recovered as follows:
wenzelm@10137
   688
wenzelm@10137
   689
  syntax (symbols)
wenzelm@10137
   690
    override  :: "('a ~=> 'b) => ('a ~=> 'b) => ('a ~=> 'b)"
wenzelm@10137
   691
      (infixl "\\<oplus>" 100)
wenzelm@10137
   692
wenzelm@8848
   693
* HOL/Real: "rabs" replaced by overloaded "abs" function;
wenzelm@8848
   694
wenzelm@8887
   695
* HOL/ML: even fewer consts are declared as global (see theories Ord,
wenzelm@8887
   696
Lfp, Gfp, WF); this only affects ML packages that refer to const names
wenzelm@8887
   697
internally;
wenzelm@8887
   698
wenzelm@10003
   699
* HOL and ZF: syntax for quotienting wrt an equivalence relation
wenzelm@10003
   700
changed from A/r to A//r;
wenzelm@9908
   701
wenzelm@10003
   702
* ZF: new treatment of arithmetic (nat & int) may break some old
wenzelm@10003
   703
proofs;
wenzelm@8921
   704
wenzelm@10003
   705
* Isar: renamed some attributes (RS -> THEN, simplify -> simplified,
wenzelm@10003
   706
rulify -> rule_format, elimify -> elim_format, ...);
paulson@9542
   707
wenzelm@9941
   708
* Isar/Provers: intro/elim/dest attributes changed; renamed
wenzelm@9941
   709
intro/intro!/intro!! flags to intro!/intro/intro? (in most cases, one
wenzelm@9937
   710
should have to change intro!! to intro? only); replaced "delrule" by
wenzelm@9937
   711
"rule del";
wenzelm@9437
   712
wenzelm@9612
   713
* Isar/HOL: renamed "intrs" to "intros" in inductive definitions;
wenzelm@9612
   714
wenzelm@9437
   715
* Provers: strengthened force_tac by using new first_best_tac;
oheimb@9402
   716
wenzelm@10003
   717
* LaTeX document preparation: several changes of isabelle.sty (see
wenzelm@10003
   718
lib/texinputs);
wenzelm@8729
   719
paulson@8014
   720
wenzelm@8487
   721
*** Document preparation ***
wenzelm@8358
   722
wenzelm@9198
   723
* formal comments (text blocks etc.) in new-style theories may now
wenzelm@9753
   724
contain antiquotations of thm/prop/term/typ/text to be presented
wenzelm@9753
   725
according to latex print mode; concrete syntax is like this:
wenzelm@9753
   726
@{term[show_types] "f(x) = a + x"};
wenzelm@9198
   727
wenzelm@8358
   728
* isatool mkdir provides easy setup of Isabelle session directories,
wenzelm@8518
   729
including proper document sources;
wenzelm@8358
   730
wenzelm@8358
   731
* generated LaTeX sources are now deleted after successful run
wenzelm@8358
   732
(isatool document -c); may retain a copy somewhere else via -D option
wenzelm@8358
   733
of isatool usedir;
wenzelm@8358
   734
wenzelm@8566
   735
* isatool usedir -D now lets isatool latex -o sty update the Isabelle
wenzelm@10003
   736
style files, achieving self-contained LaTeX sources and simplifying
wenzelm@10003
   737
LaTeX debugging;
wenzelm@8566
   738
wenzelm@8518
   739
* old-style theories now produce (crude) LaTeX output as well;
wenzelm@8358
   740
wenzelm@9057
   741
* browser info session directories are now self-contained (may be put
wenzelm@9437
   742
on WWW server seperately); improved graphs of nested sessions; removed
wenzelm@9437
   743
graph for 'all sessions';
wenzelm@9057
   744
wenzelm@10003
   745
* several improvements in isabelle style files; \isabellestyle{it}
wenzelm@10003
   746
produces fake math mode output; \isamarkupheader is now \section by
wenzelm@10003
   747
default; see lib/texinputs/isabelle.sty etc.;
wenzelm@9489
   748
wenzelm@8358
   749
wenzelm@8184
   750
*** Isar ***
wenzelm@8184
   751
wenzelm@10003
   752
* Isar/Pure: local results and corresponding term bindings are now
wenzelm@10003
   753
subject to Hindley-Milner polymorphism (similar to ML); this
wenzelm@10003
   754
accommodates incremental type-inference very nicely;
wenzelm@8283
   755
wenzelm@10003
   756
* Isar/Pure: new derived language element 'obtain' supports
wenzelm@10003
   757
generalized existence reasoning;
wenzelm@8621
   758
wenzelm@10003
   759
* Isar/Pure: new calculational elements 'moreover' and 'ultimately'
wenzelm@10003
   760
support accumulation of results, without applying any rules yet;
wenzelm@10003
   761
useful to collect intermediate results without explicit name
wenzelm@10003
   762
references, and for use with transitivity rules with more than 2
wenzelm@10003
   763
premises;
wenzelm@8184
   764
wenzelm@10003
   765
* Isar/Pure: scalable support for case-analysis type proofs: new
wenzelm@10003
   766
'case' language element refers to local contexts symbolically, as
wenzelm@10003
   767
produced by certain proof methods; internally, case names are attached
wenzelm@10003
   768
to theorems as "tags";
wenzelm@8440
   769
wenzelm@10003
   770
* Isar/Pure: theory command 'hide' removes declarations from
wenzelm@9330
   771
class/type/const name spaces;
wenzelm@9330
   772
wenzelm@10003
   773
* Isar/Pure: theory command 'defs' supports option "(overloaded)" to
wenzelm@9330
   774
indicate potential overloading;
wenzelm@9330
   775
wenzelm@10003
   776
* Isar/Pure: changed syntax of local blocks from {{ }} to { };
wenzelm@8621
   777
wenzelm@10003
   778
* Isar/Pure: syntax of sorts made 'inner', i.e. have to write
wenzelm@10003
   779
"{a,b,c}" instead of {a,b,c};
wenzelm@9011
   780
wenzelm@10003
   781
* Isar/Pure now provides its own version of intro/elim/dest
wenzelm@10003
   782
attributes; useful for building new logics, but beware of confusion
wenzelm@10003
   783
with the version in Provers/classical;
wenzelm@9612
   784
wenzelm@10003
   785
* Isar/Pure: the local context of (non-atomic) goals is provided via
wenzelm@10003
   786
case name 'antecedent';
wenzelm@8440
   787
wenzelm@10003
   788
* Isar/Pure: removed obsolete 'transfer' attribute (transfer of thms
wenzelm@10003
   789
to the current context is now done automatically);
wenzelm@9383
   790
wenzelm@10003
   791
* Isar/Pure: theory command 'method_setup' provides a simple interface
wenzelm@10003
   792
for definining proof methods in ML;
wenzelm@9612
   793
wenzelm@10003
   794
* Isar/Provers: intro/elim/dest attributes changed; renamed
wenzelm@9941
   795
intro/intro!/intro!! flags to intro!/intro/intro? (INCOMPATIBILITY, in
wenzelm@9941
   796
most cases, one should have to change intro!! to intro? only);
wenzelm@9941
   797
replaced "delrule" by "rule del";
wenzelm@8283
   798
wenzelm@10003
   799
* Isar/Provers: new 'hypsubst' method, plain 'subst' method and
wenzelm@10003
   800
'symmetric' attribute (the latter supercedes [RS sym]);
wenzelm@10003
   801
wenzelm@10003
   802
* Isar/Provers: splitter support (via 'split' attribute and 'simp'
wenzelm@10003
   803
method modifier); 'simp' method: 'only:' modifier removes loopers as
wenzelm@10003
   804
well (including splits);
wenzelm@10003
   805
wenzelm@10003
   806
* Isar/Provers: Simplifier and Classical methods now support all kind
wenzelm@10003
   807
of modifiers used in the past, including 'cong', 'iff', etc.
wenzelm@10003
   808
wenzelm@10003
   809
* Isar/Provers: added 'fastsimp' and 'clarsimp' methods (combination
wenzelm@10003
   810
of Simplifier and Classical reasoner);
wenzelm@10003
   811
wenzelm@10003
   812
* Isar/HOL: new proof method 'cases' and improved version of 'induct'
wenzelm@10003
   813
now support named cases; major packages (inductive, datatype, primrec,
wenzelm@10003
   814
recdef) support case names and properly name parameters;
wenzelm@9612
   815
wenzelm@10003
   816
* Isar/HOL: new transitivity rules for substitution in inequalities --
wenzelm@10003
   817
monotonicity conditions are extracted to be proven at end of
wenzelm@10003
   818
calculations;
wenzelm@10003
   819
wenzelm@10003
   820
* Isar/HOL: removed 'case_split' thm binding, should use 'cases' proof
wenzelm@10003
   821
method anyway;
wenzelm@10003
   822
wenzelm@10003
   823
* Isar/HOL: removed old expand_if = split_if; theorems if_splits =
wenzelm@10003
   824
split_if split_if_asm; datatype package provides theorems foo.splits =
wenzelm@10003
   825
foo.split foo.split_asm for each datatype;
wenzelm@10003
   826
wenzelm@10003
   827
* Isar/HOL: tuned inductive package, rename "intrs" to "intros"
wenzelm@10003
   828
(potential INCOMPATIBILITY), emulation of mk_cases feature for proof
wenzelm@10003
   829
scripts: new 'inductive_cases' command and 'ind_cases' method; (Note:
wenzelm@10003
   830
use "(cases (simplified))" method in proper proof texts);
wenzelm@10003
   831
wenzelm@10003
   832
* Isar/HOL: added global 'arith_split' attribute for 'arith' method;
wenzelm@10003
   833
wenzelm@10003
   834
* Isar: names of theorems etc. may be natural numbers as well;
wenzelm@10003
   835
wenzelm@10003
   836
* Isar: 'pr' command: optional arguments for goals_limit and
wenzelm@9724
   837
ProofContext.prems_limit; no longer prints theory contexts, but only
wenzelm@9724
   838
proof states;
wenzelm@8487
   839
wenzelm@10003
   840
* Isar: diagnostic commands 'pr', 'thm', 'prop', 'term', 'typ' admit
wenzelm@8518
   841
additional print modes to be specified; e.g. "pr(latex)" will print
wenzelm@8518
   842
proof state according to the Isabelle LaTeX style;
wenzelm@8487
   843
wenzelm@10003
   844
* Isar: improved support for emulating tactic scripts, including proof
wenzelm@9612
   845
methods 'rule_tac' etc., 'cut_tac', 'thin_tac', 'subgoal_tac',
wenzelm@9612
   846
'rename_tac', 'rotate_tac', 'tactic', and 'case_tac' / 'induct_tac'
wenzelm@9612
   847
(for HOL datatypes);
wenzelm@8534
   848
wenzelm@10003
   849
* Isar: simplified (more robust) goal selection of proof methods: 1st
wenzelm@10003
   850
goal, all goals, or explicit goal specifier (tactic emulation); thus
wenzelm@10003
   851
'proof method scripts' have to be in depth-first order;
wenzelm@8673
   852
wenzelm@10003
   853
* Isar: tuned 'let' syntax: replaced 'as' keyword by 'and';
wenzelm@8729
   854
wenzelm@10003
   855
* Isar: removed 'help' command, which hasn't been too helpful anyway;
wenzelm@10003
   856
should instead use individual commands for printing items
wenzelm@10003
   857
(print_commands, print_methods etc.);
wenzelm@9224
   858
wenzelm@10003
   859
* Isar: added 'nothing' --- the empty list of theorems;
wenzelm@9239
   860
wenzelm@8184
   861
paulson@8014
   862
*** HOL ***
paulson@8014
   863
wenzelm@10080
   864
* HOL/MicroJava: formalization of a fragment of Java, together with a
wenzelm@10080
   865
corresponding virtual machine and a specification of its bytecode
wenzelm@10080
   866
verifier and a lightweight bytecode verifier, including proofs of
wenzelm@10080
   867
type-safety; by Gerwin Klein, Tobias Nipkow, David von Oheimb, and
wenzelm@10080
   868
Cornelia Pusch (see also the homepage of project Bali at
wenzelm@10080
   869
http://isabelle.in.tum.de/Bali/);
wenzelm@10080
   870
wenzelm@8518
   871
* HOL/Algebra: new theory of rings and univariate polynomials, by
wenzelm@8518
   872
Clemens Ballarin;
paulson@8014
   873
wenzelm@10157
   874
* HOL/NumberTheory: fundamental Theorem of Arithmetic, Chinese
wenzelm@10003
   875
Remainder Theorem, Fermat/Euler Theorem, Wilson's Theorem, by Thomas M
wenzelm@10003
   876
Rasmussen;
wenzelm@8570
   877
wenzelm@10157
   878
* HOL/Lattice: fundamental concepts of lattice theory and order
wenzelm@10157
   879
structures, including duals, properties of bounds versus algebraic
wenzelm@10157
   880
laws, lattice operations versus set-theoretic ones, the Knaster-Tarski
wenzelm@10157
   881
Theorem for complete lattices etc.; may also serve as a demonstration
wenzelm@10157
   882
for abstract algebraic reasoning using axiomatic type classes, and
wenzelm@10157
   883
mathematics-style proof in Isabelle/Isar; by Markus Wenzel;
wenzelm@10157
   884
wenzelm@10003
   885
* HOL/Prolog: a (bare-bones) implementation of Lambda-Prolog, by David
wenzelm@10003
   886
von Oheimb;
paulson@9542
   887
wenzelm@10164
   888
* HOL/IMPP: extension of IMP with local variables and mutually
wenzelm@10164
   889
recursive procedures, by David von Oheimb;
wenzelm@10164
   890
wenzelm@10003
   891
* HOL/Lambda: converted into new-style theory and document;
paulson@9542
   892
wenzelm@10003
   893
* HOL/ex/Multiquote: example of multiple nested quotations and
wenzelm@10003
   894
anti-quotations -- basically a generalized version of de-Bruijn
wenzelm@10003
   895
representation; very useful in avoiding lifting of operations;
wenzelm@8848
   896
wenzelm@9612
   897
* HOL/record: added general record equality rule to simpset; fixed
wenzelm@9612
   898
select-update simplification procedure to handle extended records as
wenzelm@9612
   899
well; admit "r" as field name;
paulson@9542
   900
paulson@8967
   901
* HOL: 0 is now overloaded over the new sort "zero", allowing its use with
paulson@8967
   902
other numeric types and also as the identity of groups, rings, etc.;
paulson@8967
   903
paulson@8967
   904
* HOL: new axclass plus_ac0 for addition with the AC-laws and 0 as identity.
paulson@8967
   905
Types nat and int belong to this axclass;
paulson@8967
   906
wenzelm@10003
   907
* HOL: greatly improved simplification involving numerals of type nat, int, real:
paulson@8788
   908
   (i + #8 + j) = Suc k simplifies to  #7 + (i + j) = k
paulson@8832
   909
   i*j + k + j*#3*i     simplifies to  #4*(i*j) + k
paulson@8832
   910
  two terms #m*u and #n*u are replaced by #(m+n)*u
paulson@8832
   911
    (where #m, #n and u can implicitly be 1; this is simproc combine_numerals)
paulson@8832
   912
  and the term/formula #m*u+x ~~ #n*u+y simplifies simplifies to #(m-n)+x ~~ y
paulson@8832
   913
    or x ~~ #(n-m)+y, where ~~ is one of = < <= or - (simproc cancel_numerals);
paulson@8736
   914
wenzelm@10003
   915
* HOL: meson_tac is available (previously in ex/meson.ML); it is a
wenzelm@10003
   916
powerful prover for predicate logic but knows nothing of clasets; see
wenzelm@10003
   917
ex/mesontest.ML and ex/mesontest2.ML for example applications;
paulson@9835
   918
wenzelm@8848
   919
* HOL: new version of "case_tac" subsumes both boolean case split and
wenzelm@8440
   920
"exhaust_tac" on datatypes; INCOMPATIBILITY: exhaust_tac no longer
wenzelm@8518
   921
exists, may define val exhaust_tac = case_tac for ad-hoc portability;
wenzelm@8440
   922
wenzelm@8848
   923
* HOL: simplification no longer dives into case-expressions: only the
wenzelm@10129
   924
selector expression is simplified, but not the remaining arms; to
wenzelm@10129
   925
enable full simplification of case-expressions for datatype t, you may
wenzelm@10129
   926
remove t.weak_case_cong from the simpset, either globally (Delcongs
wenzelm@10129
   927
[thm"t.weak_case_cong"];) or locally (delcongs [...]).
nipkow@8603
   928
wenzelm@8848
   929
* HOL/recdef: the recursion equations generated by 'recdef' for
wenzelm@8848
   930
function 'f' are now called f.simps instead of f.rules; if all
wenzelm@8848
   931
termination conditions are proved automatically, these simplification
wenzelm@8848
   932
rules are added to the simpset, as in primrec; rules may be named
wenzelm@8848
   933
individually as well, resulting in a separate list of theorems for
wenzelm@8848
   934
each equation;
wenzelm@8848
   935
wenzelm@9489
   936
* HOL/While is a new theory that provides a while-combinator. It
wenzelm@9489
   937
permits the definition of tail-recursive functions without the
wenzelm@9489
   938
provision of a termination measure. The latter is necessary once the
wenzelm@9489
   939
invariant proof rule for while is applied.
nipkow@9457
   940
wenzelm@10003
   941
* HOL: new (overloaded) notation for the set of elements below/above
wenzelm@10003
   942
some element: {..u}, {..u(}, {l..}, {)l..}. See theory SetInterval.
nipkow@8925
   943
wenzelm@8848
   944
* HOL: theorems impI, allI, ballI bound as "strip";
wenzelm@8848
   945
wenzelm@10003
   946
* HOL: new tactic induct_thm_tac: thm -> string -> int -> tactic
nipkow@9746
   947
induct_tac th "x1 ... xn" expects th to have a conclusion of the form
nipkow@9746
   948
P v1 ... vn and abbreviates res_inst_tac [("v1","x1"),...,("vn","xn")] th;
nipkow@9746
   949
wenzelm@10003
   950
* HOL/Real: "rabs" replaced by overloaded "abs" function;
nipkow@9737
   951
wenzelm@10003
   952
* HOL: theory Sexp now in HOL/Induct examples (it used to be part of
wenzelm@10003
   953
main HOL, but was unused);
nipkow@8626
   954
wenzelm@10003
   955
* HOL: fewer consts declared as global (e.g. have to refer to
wenzelm@10003
   956
"Lfp.lfp" instead of "lfp" internally; affects ML packages only);
wenzelm@8887
   957
wenzelm@10003
   958
* HOL: tuned AST representation of nested pairs, avoiding bogus output
wenzelm@10003
   959
in case of overlap with user translations (e.g. judgements over
wenzelm@10003
   960
tuples); (note that the underlying logical represenation is still
wenzelm@10003
   961
bogus);
wenzelm@9349
   962
nipkow@8412
   963
paulson@9542
   964
*** ZF ***
paulson@9542
   965
wenzelm@10003
   966
* ZF: simplification automatically cancels common terms in arithmetic
wenzelm@10003
   967
expressions over nat and int;
paulson@9542
   968
wenzelm@10003
   969
* ZF: new treatment of nat to minimize type-checking: all operators
wenzelm@10003
   970
coerce their operands to a natural number using the function natify,
wenzelm@10003
   971
making the algebraic laws unconditional;
paulson@9542
   972
wenzelm@10003
   973
* ZF: as above, for int: operators coerce their operands to an integer
wenzelm@10003
   974
using the function intify;
paulson@9542
   975
wenzelm@10003
   976
* ZF: the integer library now contains many of the usual laws for the
wenzelm@10003
   977
orderings, including $<=, and monotonicity laws for $+ and $*;
paulson@9542
   978
wenzelm@10003
   979
* ZF: new example ZF/ex/NatSum to demonstrate integer arithmetic
wenzelm@10003
   980
simplification;
paulson@9388
   981
wenzelm@10003
   982
* FOL and ZF: AddIffs now available, giving theorems of the form P<->Q
wenzelm@10003
   983
to the simplifier and classical reasoner simultaneously;
paulson@9388
   984
paulson@9388
   985
wenzelm@8358
   986
*** General ***
wenzelm@8358
   987
wenzelm@10003
   988
* Provers: blast_tac now handles actual object-logic rules as
wenzelm@10003
   989
assumptions; note that auto_tac uses blast_tac internally as well;
wenzelm@10003
   990
wenzelm@10003
   991
* Provers: new functions rulify/rulify_no_asm: thm -> thm for turning
wenzelm@10003
   992
outer -->/All/Ball into ==>/!!; qed_spec_mp now uses rulify_no_asm;
wenzelm@10003
   993
wenzelm@9941
   994
* Provers: delrules now handles destruct rules as well (no longer need
wenzelm@9941
   995
explicit make_elim);
wenzelm@9941
   996
wenzelm@10003
   997
* Provers: Blast_tac now warns of and ignores "weak elimination rules" e.g.
wenzelm@10003
   998
  [| inj ?f;          ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
wenzelm@10003
   999
use instead the strong form,
wenzelm@10003
  1000
  [| inj ?f; ~ ?W ==> ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
wenzelm@10003
  1001
in HOL, FOL and ZF the function cla_make_elim will create such rules
wenzelm@10003
  1002
from destruct-rules;
wenzelm@9489
  1003
wenzelm@9709
  1004
* Provers: Simplifier.easy_setup provides a fast path to basic
wenzelm@9709
  1005
Simplifier setup for new object-logics;
wenzelm@9709
  1006
wenzelm@9709
  1007
* Pure: AST translation rules no longer require constant head on LHS;
wenzelm@9349
  1008
wenzelm@9709
  1009
* Pure: improved name spaces: ambiguous output is qualified; support
wenzelm@9709
  1010
for hiding of names;
wenzelm@8729
  1011
wenzelm@10003
  1012
* system: smart setup of canonical ML_HOME, ISABELLE_INTERFACE, and
wenzelm@10003
  1013
XSYMBOL_HOME; no longer need to do manual configuration in most
wenzelm@10003
  1014
situations;
wenzelm@10003
  1015
wenzelm@9709
  1016
* system: compression of ML heaps images may now be controlled via -c
wenzelm@9709
  1017
option of isabelle and isatool usedir (currently only observed by
wenzelm@9709
  1018
Poly/ML);
wenzelm@8358
  1019
wenzelm@9981
  1020
* system: isatool installfonts may handle X-Symbol fonts as well (very
wenzelm@9981
  1021
useful for remote X11);
wenzelm@9981
  1022
wenzelm@9709
  1023
* system: provide TAGS file for Isabelle sources;
wenzelm@9052
  1024
wenzelm@9288
  1025
* ML: infix 'OF' is a version of 'MRS' with more appropriate argument
wenzelm@9288
  1026
order;
wenzelm@9288
  1027
wenzelm@8994
  1028
* ML: renamed flags Syntax.trace_norm_ast to Syntax.trace_ast; global
wenzelm@8994
  1029
timing flag supersedes proof_timing and Toplevel.trace;
wenzelm@8994
  1030
wenzelm@10003
  1031
* ML: new combinators |>> and |>>> for incremental transformations
wenzelm@10003
  1032
with secondary results (e.g. certain theory extensions):
wenzelm@10003
  1033
wenzelm@9330
  1034
* ML: PureThy.add_defs gets additional argument to indicate potential
wenzelm@9330
  1035
overloading (usually false);
wenzelm@9330
  1036
wenzelm@10003
  1037
* ML: PureThy.add_thms/add_axioms/add_defs now return theorems as
wenzelm@10003
  1038
results;
wenzelm@8440
  1039
wenzelm@8358
  1040
wenzelm@8015
  1041
wenzelm@7986
  1042
New in Isabelle99 (October 1999)
wenzelm@7986
  1043
--------------------------------
oheimb@4649
  1044
paulson@5931
  1045
*** Overview of INCOMPATIBILITIES (see below for more details) ***
paulson@5931
  1046
paulson@6922
  1047
* HOL: The THEN and ELSE parts of conditional expressions (if P then x else y)
paulson@6922
  1048
are no longer simplified.  (This allows the simplifier to unfold recursive
paulson@6922
  1049
functional programs.)  To restore the old behaviour, declare
wenzelm@7215
  1050
wenzelm@7215
  1051
    Delcongs [if_weak_cong];
paulson@6922
  1052
wenzelm@6269
  1053
* HOL: Removed the obsolete syntax "Compl A"; use -A for set
wenzelm@6269
  1054
complement;
paulson@5931
  1055
wenzelm@6269
  1056
* HOL: the predicate "inj" is now defined by translation to "inj_on";
paulson@6174
  1057
berghofe@7847
  1058
* HOL/datatype: mutual_induct_tac no longer exists --
berghofe@7847
  1059
  use induct_tac "x_1 ... x_n" instead of mutual_induct_tac ["x_1", ..., "x_n"]
berghofe@7847
  1060
wenzelm@6386
  1061
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
  1062
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
  1063
wenzelm@6269
  1064
* ZF: The con_defs part of an inductive definition may no longer refer
wenzelm@6269
  1065
to constants declared in the same theory;
nipkow@6057
  1066
wenzelm@6269
  1067
* HOL, ZF: the function mk_cases, generated by the inductive
wenzelm@6269
  1068
definition package, has lost an argument.  To simplify its result, it
wenzelm@6269
  1069
uses the default simpset instead of a supplied list of theorems.
paulson@6141
  1070
wenzelm@7215
  1071
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
  1072
nipkow@7619
  1073
* Simplifier: the type of the infix ML functions
wenzelm@8729
  1074
        setSSolver addSSolver setSolver addSolver
nipkow@7619
  1075
is now  simpset * solver -> simpset  where `solver' is a new abstract type
nipkow@7619
  1076
for packaging solvers. A solver is created via
wenzelm@8729
  1077
        mk_solver: string -> (thm list -> int -> tactic) -> solver
nipkow@7619
  1078
where the string argument is only a comment.
nipkow@6057
  1079
wenzelm@7647
  1080
paulson@6069
  1081
*** Proof tools ***
paulson@6069
  1082
wenzelm@6343
  1083
* Provers/Arith/fast_lin_arith.ML contains a functor for creating a
wenzelm@6343
  1084
decision procedure for linear arithmetic. Currently it is used for
wenzelm@7593
  1085
types `nat', `int', and `real' in HOL (see below); it can, should and
wenzelm@7593
  1086
will be instantiated for other types and logics as well.
paulson@6069
  1087
nipkow@7324
  1088
* The simplifier now accepts rewrite rules with flexible heads, eg
nipkow@7324
  1089
     hom ?f ==> ?f(?x+?y) = ?f ?x + ?f ?y
nipkow@7324
  1090
  They are applied like any rule with a non-pattern lhs, i.e. by first-order
nipkow@7324
  1091
  matching.
paulson@6069
  1092
wenzelm@7593
  1093
paulson@6014
  1094
*** General ***
paulson@6014
  1095
wenzelm@7986
  1096
* New Isabelle/Isar subsystem provides an alternative to traditional
wenzelm@7215
  1097
tactical theorem proving; together with the ProofGeneral/isar user
wenzelm@7215
  1098
interface it offers an interactive environment for developing human
wenzelm@7215
  1099
readable proof documents (Isar == Intelligible semi-automated
wenzelm@7886
  1100
reasoning); for further information see isatool doc isar-ref,
wenzelm@7986
  1101
src/HOL/Isar_examples and http://isabelle.in.tum.de/Isar/
wenzelm@7886
  1102
wenzelm@9612
  1103
* improved and simplified presentation of theories: better HTML markup
wenzelm@9612
  1104
(including colors), graph views in several sizes; isatool usedir now
wenzelm@9612
  1105
provides a proper interface for user theories (via -P option); actual
wenzelm@9612
  1106
document preparation based on (PDF)LaTeX is available as well (for
wenzelm@9612
  1107
new-style theories only); see isatool doc system for more information;
wenzelm@7215
  1108
wenzelm@7252
  1109
* native support for Proof General, both for classic Isabelle and
wenzelm@7986
  1110
Isabelle/Isar;
wenzelm@7215
  1111
wenzelm@7791
  1112
* ML function thm_deps visualizes dependencies of theorems and lemmas,
wenzelm@7791
  1113
using the graph browser tool;
wenzelm@7791
  1114
wenzelm@6751
  1115
* Isabelle manuals now also available as PDF;
wenzelm@6751
  1116
wenzelm@6449
  1117
* theory loader rewritten from scratch (may not be fully
wenzelm@6449
  1118
bug-compatible); old loadpath variable has been replaced by show_path,
wenzelm@6671
  1119
add_path, del_path, reset_path functions; new operations such as
wenzelm@7593
  1120
update_thy, touch_thy, remove_thy, use/update_thy_only (see also
wenzelm@7593
  1121
isatool doc ref);
wenzelm@6449
  1122
wenzelm@7215
  1123
* improved isatool install: option -k creates KDE application icon,
wenzelm@7215
  1124
option -p DIR installs standalone binaries;
wenzelm@7215
  1125
wenzelm@7215
  1126
* added ML_PLATFORM setting (useful for cross-platform installations);
wenzelm@7215
  1127
more robust handling of platform specific ML images for SML/NJ;
wenzelm@7215
  1128
wenzelm@7886
  1129
* the settings environment is now statically scoped, i.e. it is never
wenzelm@7986
  1130
created again in sub-processes invoked from isabelle, isatool, or
wenzelm@7886
  1131
Isabelle;
wenzelm@7886
  1132
wenzelm@7215
  1133
* path element specification '~~' refers to '$ISABELLE_HOME';
wenzelm@7215
  1134
wenzelm@6343
  1135
* in locales, the "assumes" and "defines" parts may be omitted if
wenzelm@6343
  1136
empty;
wenzelm@5973
  1137
wenzelm@6269
  1138
* new print_mode "xsymbols" for extended symbol support (e.g. genuine
wenzelm@6269
  1139
long arrows);
wenzelm@6259
  1140
wenzelm@6343
  1141
* new print_mode "HTML";
wenzelm@6343
  1142
wenzelm@6343
  1143
* new flag show_tags controls display of tags of theorems (which are
wenzelm@6343
  1144
basically just comments that may be attached by some tools);
wenzelm@6343
  1145
wenzelm@6461
  1146
* Isamode 2.6 requires patch to accomodate change of Isabelle font
wenzelm@6461
  1147
mode and goal output format:
wenzelm@6461
  1148
wenzelm@6461
  1149
diff -r Isamode-2.6/elisp/isa-load.el Isamode/elisp/isa-load.el
wenzelm@6461
  1150
244c244
wenzelm@6461
  1151
<       (list (isa-getenv "ISABELLE") "-msymbols" logic-name)
wenzelm@6461
  1152
---
wenzelm@6533
  1153
>       (list (isa-getenv "ISABELLE") "-misabelle_font" "-msymbols" logic-name)
wenzelm@6461
  1154
diff -r Isabelle-2.6/elisp/isa-proofstate.el Isamode/elisp/isa-proofstate.el
wenzelm@6461
  1155
181c181
wenzelm@6461
  1156
< (defconst proofstate-proofstart-regexp "^Level [0-9]+$"
wenzelm@6461
  1157
---
wenzelm@6461
  1158
> (defconst proofstate-proofstart-regexp "^Level [0-9]+"
wenzelm@6461
  1159
wenzelm@7450
  1160
* function bind_thms stores lists of theorems (cf. bind_thm);
wenzelm@7450
  1161
wenzelm@7593
  1162
* new shorthand tactics ftac, eatac, datac, fatac;
wenzelm@7593
  1163
wenzelm@7593
  1164
* qed (and friends) now accept "" as result name; in that case the
wenzelm@7986
  1165
theorem is not stored, but proper checks and presentation of the
wenzelm@7986
  1166
result still apply;
wenzelm@7593
  1167
wenzelm@7805
  1168
* theorem database now also indexes constants "Trueprop", "all",
wenzelm@7805
  1169
"==>", "=="; thus thms_containing, findI etc. may retrieve more rules;
wenzelm@7805
  1170
oheimb@6028
  1171
nipkow@6057
  1172
*** HOL ***
nipkow@6057
  1173
wenzelm@7215
  1174
** HOL arithmetic **
wenzelm@7215
  1175
wenzelm@6343
  1176
* There are now decision procedures for linear arithmetic over nat and
wenzelm@6343
  1177
int:
nipkow@6131
  1178
wenzelm@6343
  1179
1. arith_tac copes with arbitrary formulae involving `=', `<', `<=',
wenzelm@6343
  1180
`+', `-', `Suc', `min', `max' and numerical constants; other subterms
wenzelm@6343
  1181
are treated as atomic; subformulae not involving type `nat' or `int'
wenzelm@6343
  1182
are ignored; quantified subformulae are ignored unless they are
wenzelm@6343
  1183
positive universal or negative existential. The tactic has to be
wenzelm@6343
  1184
invoked by hand and can be a little bit slow. In particular, the
wenzelm@6343
  1185
running time is exponential in the number of occurrences of `min' and
wenzelm@6343
  1186
`max', and `-' on `nat'.
nipkow@6131
  1187
wenzelm@6343
  1188
2. fast_arith_tac is a cut-down version of arith_tac: it only takes
wenzelm@6343
  1189
(negated) (in)equalities among the premises and the conclusion into
wenzelm@6343
  1190
account (i.e. no compound formulae) and does not know about `min' and
wenzelm@6343
  1191
`max', and `-' on `nat'. It is fast and is used automatically by the
wenzelm@6343
  1192
simplifier.
nipkow@6131
  1193
wenzelm@6343
  1194
NB: At the moment, these decision procedures do not cope with mixed
wenzelm@6343
  1195
nat/int formulae where the two parts interact, such as `m < n ==>
wenzelm@6343
  1196
int(m) < int(n)'.
oheimb@6028
  1197
wenzelm@7215
  1198
* HOL/Numeral provides a generic theory of numerals (encoded
wenzelm@7313
  1199
efficiently as bit strings); setup for types nat/int/real is in place;
wenzelm@7215
  1200
INCOMPATIBILITY: since numeral syntax is now polymorphic, rather than
wenzelm@7215
  1201
int, existing theories and proof scripts may require a few additional
wenzelm@7215
  1202
type constraints;
wenzelm@7215
  1203
wenzelm@7215
  1204
* integer division and remainder can now be performed on constant
wenzelm@7215
  1205
arguments;
paulson@7157
  1206
wenzelm@7215
  1207
* many properties of integer multiplication, division and remainder
wenzelm@7215
  1208
are now available;
paulson@6922
  1209
paulson@7287
  1210
* An interface to the Stanford Validity Checker (SVC) is available through the
paulson@7287
  1211
tactic svc_tac.  Propositional tautologies and theorems of linear arithmetic
paulson@7287
  1212
are proved automatically.  SVC must be installed separately, and its results
paulson@7287
  1213
must be TAKEN ON TRUST (Isabelle does not check the proofs, but tags any
paulson@7287
  1214
invocation of the underlying oracle).  For SVC see
paulson@7444
  1215
  http://verify.stanford.edu/SVC
paulson@6922
  1216
wenzelm@7125
  1217
* IsaMakefile: the HOL-Real target now builds an actual image;
wenzelm@7125
  1218
wenzelm@7215
  1219
wenzelm@7215
  1220
** HOL misc **
wenzelm@7215
  1221
wenzelm@7595
  1222
* HOL/Real/HahnBanach: the Hahn-Banach theorem for real vector spaces
wenzelm@7595
  1223
(in Isabelle/Isar) -- by Gertrud Bauer;
wenzelm@7595
  1224
wenzelm@7691
  1225
* HOL/BCV: generic model of bytecode verification, i.e. data-flow
wenzelm@7691
  1226
analysis for assembly languages with subtypes;
wenzelm@7691
  1227
wenzelm@6278
  1228
* HOL/TLA (Lamport's Temporal Logic of Actions): major reorganization
wenzelm@6278
  1229
-- avoids syntactic ambiguities and treats state, transition, and
wenzelm@6278
  1230
temporal levels more uniformly; introduces INCOMPATIBILITIES due to
wenzelm@6278
  1231
changed syntax and (many) tactics;
wenzelm@6278
  1232
wenzelm@7791
  1233
* HOL/inductive: Now also handles more general introduction rules such
wenzelm@7791
  1234
  as "ALL y. (y, x) : r --> y : acc r ==> x : acc r"; monotonicity
wenzelm@7791
  1235
  theorems are now maintained within the theory (maintained via the
wenzelm@7791
  1236
  "mono" attribute);
berghofe@7780
  1237
wenzelm@7238
  1238
* HOL/datatype: Now also handles arbitrarily branching datatypes
wenzelm@7238
  1239
  (using function types) such as
wenzelm@7238
  1240
wenzelm@7238
  1241
  datatype 'a tree = Atom 'a | Branch "nat => 'a tree"
berghofe@7047
  1242
wenzelm@7326
  1243
* HOL/record: record_simproc (part of the default simpset) takes care
wenzelm@7326
  1244
of selectors applied to updated records; record_split_tac is no longer
wenzelm@7327
  1245
part of the default claset; update_defs may now be removed from the
wenzelm@7327
  1246
simpset in many cases; COMPATIBILITY: old behavior achieved by
wenzelm@7326
  1247
wenzelm@7326
  1248
  claset_ref () := claset() addSWrapper record_split_wrapper;
wenzelm@7326
  1249
  Delsimprocs [record_simproc]
wenzelm@7326
  1250
wenzelm@6386
  1251
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
  1252
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
  1253
paulson@7287
  1254
* HOL/recdef (TFL): 'congs' syntax now expects comma separated list of theorem
paulson@7287
  1255
names rather than an ML expression;
paulson@7287
  1256
paulson@7287
  1257
* HOL/defer_recdef (TFL): like recdef but the well-founded relation can be
paulson@7287
  1258
supplied later.  Program schemes can be defined, such as
paulson@7287
  1259
    "While B C s = (if B s then While B C (C s) else s)"
paulson@7287
  1260
where the well-founded relation can be chosen after B and C have been given.
wenzelm@6563
  1261
wenzelm@7215
  1262
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
  1263
INCOMPATIBILITY: while [] and infix # syntax is still there, of
wenzelm@7215
  1264
course, ML tools referring to List.list.op # etc. have to be adapted;
wenzelm@7215
  1265
wenzelm@7238
  1266
* HOL_quantifiers flag superseded by "HOL" print mode, which is
wenzelm@7238
  1267
disabled by default; run isabelle with option -m HOL to get back to
wenzelm@7238
  1268
the original Gordon/HOL-style output;
wenzelm@7238
  1269
wenzelm@7238
  1270
* HOL/Ord.thy: new bounded quantifier syntax (input only): ALL x<y. P,
wenzelm@7238
  1271
ALL x<=y. P, EX x<y. P, EX x<=y. P;
wenzelm@7238
  1272
wenzelm@7238
  1273
* HOL basic syntax simplified (more orthogonal): all variants of
wenzelm@7238
  1274
All/Ex now support plain / symbolic / HOL notation; plain syntax for
wenzelm@7238
  1275
Eps operator is provided as well: "SOME x. P[x]";
wenzelm@7238
  1276
berghofe@7320
  1277
* HOL/Sum.thy: sum_case has been moved to HOL/Datatype;
wenzelm@7261
  1278
wenzelm@7280
  1279
* HOL/Univ.thy: infix syntax <*>, <+>, <**>, <+> eliminated and made
wenzelm@7280
  1280
thus available for user theories;
wenzelm@7280
  1281
wenzelm@7300
  1282
* HOLCF/IOA/Sequents: renamed 'Cons' to 'Consq' to avoid clash with
wenzelm@7300
  1283
HOL/List; hardly an INCOMPATIBILITY since '>>' syntax is used all the
wenzelm@7300
  1284
time;
wenzelm@7300
  1285
wenzelm@7986
  1286
* HOL: new tactic smp_tac: int -> int -> tactic, which applies spec
wenzelm@7986
  1287
several times and then mp;
oheimb@7492
  1288
wenzelm@7215
  1289
paulson@7113
  1290
*** LK ***
paulson@7113
  1291
wenzelm@7215
  1292
* the notation <<...>> is now available as a notation for sequences of
wenzelm@7215
  1293
formulas;
paulson@7113
  1294
paulson@7113
  1295
* the simplifier is now installed
paulson@7113
  1296
wenzelm@8729
  1297
* the axiom system has been generalized (thanks to Soren Heilmann)
paulson@7113
  1298
paulson@7113
  1299
* the classical reasoner now has a default rule database
paulson@7113
  1300
paulson@7113
  1301
paulson@6064
  1302
*** ZF ***
paulson@6064
  1303
paulson@6064
  1304
* new primrec section allows primitive recursive functions to be given
wenzelm@6269
  1305
directly (as in HOL) over datatypes and the natural numbers;
paulson@6064
  1306
wenzelm@6269
  1307
* new tactics induct_tac and exhaust_tac for induction (or case
wenzelm@6269
  1308
analysis) over datatypes and the natural numbers;
paulson@6064
  1309
paulson@6064
  1310
* the datatype declaration of type T now defines the recursor T_rec;
paulson@6064
  1311
paulson@6141
  1312
* simplification automatically does freeness reasoning for datatype
wenzelm@6269
  1313
constructors;
paulson@6141
  1314
wenzelm@6269
  1315
* automatic type-inference, with AddTCs command to insert new
wenzelm@6269
  1316
type-checking rules;
paulson@6155
  1317
wenzelm@6269
  1318
* datatype introduction rules are now added as Safe Introduction rules
wenzelm@6269
  1319
to the claset;
paulson@6155
  1320
wenzelm@6269
  1321
* the syntax "if P then x else y" is now available in addition to
wenzelm@6269
  1322
if(P,x,y);
wenzelm@6269
  1323
paulson@6069
  1324
wenzelm@6343
  1325
*** Internal programming interfaces ***
wenzelm@6343
  1326
wenzelm@7919
  1327
* tuned simplifier trace output; new flag debug_simp;
wenzelm@7919
  1328
wenzelm@7420
  1329
* structures Vartab / Termtab (instances of TableFun) offer efficient
wenzelm@7420
  1330
tables indexed by indexname_ord / term_ord (compatible with aconv);
wenzelm@7420
  1331
wenzelm@6386
  1332
* AxClass.axclass_tac lost the theory argument;
wenzelm@6386
  1333
wenzelm@6343
  1334
* tuned current_goals_markers semantics: begin / end goal avoids
wenzelm@6343
  1335
printing empty lines;
wenzelm@6343
  1336
wenzelm@6343
  1337
* removed prs and prs_fn hook, which was broken because it did not
wenzelm@6343
  1338
include \n in its semantics, forcing writeln to add one
wenzelm@6343
  1339
uncoditionally; replaced prs_fn by writeln_fn; consider std_output:
wenzelm@6343
  1340
string -> unit if you really want to output text without newline;
wenzelm@6343
  1341
wenzelm@6343
  1342
* Symbol.output subject to print mode; INCOMPATIBILITY: defaults to
wenzelm@6343
  1343
plain output, interface builders may have to enable 'isabelle_font'
wenzelm@6343
  1344
mode to get Isabelle font glyphs as before;
wenzelm@6343
  1345
wenzelm@6343
  1346
* refined token_translation interface; INCOMPATIBILITY: output length
wenzelm@6343
  1347
now of type real instead of int;
wenzelm@6343
  1348
wenzelm@7196
  1349
* theory loader actions may be traced via new ThyInfo.add_hook
wenzelm@7196
  1350
interface (see src/Pure/Thy/thy_info.ML); example application: keep
wenzelm@7196
  1351
your own database of information attached to *whole* theories -- as
wenzelm@7196
  1352
opposed to intra-theory data slots offered via TheoryDataFun;
wenzelm@7196
  1353
wenzelm@7647
  1354
* proper handling of dangling sort hypotheses (at last!);
wenzelm@7647
  1355
Thm.strip_shyps and Drule.strip_shyps_warning take care of removing
wenzelm@7647
  1356
extra sort hypotheses that can be witnessed from the type signature;
wenzelm@7986
  1357
the force_strip_shyps flag is gone, any remaining shyps are simply
wenzelm@7986
  1358
left in the theorem (with a warning issued by strip_shyps_warning);
wenzelm@7647
  1359
wenzelm@6343
  1360
paulson@6064
  1361
wenzelm@5781
  1362
New in Isabelle98-1 (October 1998)
wenzelm@5781
  1363
----------------------------------
wenzelm@5781
  1364
wenzelm@5127
  1365
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4842
  1366
wenzelm@5726
  1367
* several changes of automated proof tools;
wenzelm@5373
  1368
wenzelm@5726
  1369
* HOL: major changes to the inductive and datatype packages, including
wenzelm@5726
  1370
some minor incompatibilities of theory syntax;
berghofe@5214
  1371
wenzelm@5726
  1372
* HOL: renamed r^-1 to 'converse' from 'inverse'; 'inj_onto' is now
wenzelm@5217
  1373
called `inj_on';
paulson@5160
  1374
nipkow@5275
  1375
* HOL: removed duplicate thms in Arith:
nipkow@5275
  1376
  less_imp_add_less  should be replaced by  trans_less_add1
nipkow@5275
  1377
  le_imp_add_le      should be replaced by  trans_le_add1
paulson@5160
  1378
wenzelm@5726
  1379
* HOL: unary minus is now overloaded (new type constraints may be
wenzelm@5726
  1380
required);
paulson@5490
  1381
wenzelm@5726
  1382
* HOL and ZF: unary minus for integers is now #- instead of #~.  In
wenzelm@5726
  1383
ZF, expressions such as n#-1 must be changed to n#- 1, since #-1 is
wenzelm@5726
  1384
now taken as an integer constant.
paulson@5541
  1385
wenzelm@5726
  1386
* Pure: ML function 'theory_of' renamed to 'theory';
wenzelm@5397
  1387
wenzelm@5363
  1388
wenzelm@5127
  1389
*** Proof tools ***
nipkow@4880
  1390
nipkow@5657
  1391
* Simplifier:
nipkow@5657
  1392
  1. Asm_full_simp_tac is now more aggressive.
nipkow@5657
  1393
     1. It will sometimes reorient premises if that increases their power to
nipkow@5657
  1394
        simplify.
nipkow@5657
  1395
     2. It does no longer proceed strictly from left to right but may also
nipkow@5657
  1396
        rotate premises to achieve further simplification.
nipkow@5657
  1397
     For compatibility reasons there is now Asm_lr_simp_tac which is like the
nipkow@5657
  1398
     old Asm_full_simp_tac in that it does not rotate premises.
nipkow@5657
  1399
  2. The simplifier now knows a little bit about nat-arithmetic.
nipkow@4880
  1400
wenzelm@5127
  1401
* Classical reasoner: wrapper mechanism for the classical reasoner now
wenzelm@5127
  1402
allows for selected deletion of wrappers, by introduction of names for
wenzelm@5127
  1403
wrapper functionals.  This implies that addbefore, addSbefore,
wenzelm@5127
  1404
addaltern, and addSaltern now take a pair (name, tactic) as argument,
wenzelm@5127
  1405
and that adding two tactics with the same name overwrites the first
wenzelm@5127
  1406
one (emitting a warning).
oheimb@4824
  1407
  type wrapper = (int -> tactic) -> (int -> tactic)
oheimb@4649
  1408
  setWrapper, setSWrapper, compWrapper and compSWrapper are replaced by
oheimb@4824
  1409
  addWrapper, addSWrapper: claset * (string * wrapper) -> claset
oheimb@4824
  1410
  delWrapper, delSWrapper: claset *  string            -> claset
oheimb@4649
  1411
  getWrapper is renamed to appWrappers, getSWrapper to appSWrappers;
oheimb@4649
  1412
wenzelm@5705
  1413
* Classical reasoner: addbefore/addSbefore now have APPEND/ORELSE
wenzelm@5726
  1414
semantics; addbefore now affects only the unsafe part of step_tac
wenzelm@5726
  1415
etc.; this affects addss/auto_tac/force_tac, so EXISTING PROOFS MAY
wenzelm@5726
  1416
FAIL, but proofs should be fixable easily, e.g. by replacing Auto_tac
wenzelm@5726
  1417
by Force_tac;
oheimb@5524
  1418
wenzelm@5726
  1419
* Classical reasoner: setwrapper to setWrapper and compwrapper to
wenzelm@5726
  1420
compWrapper; added safe wrapper (and access functions for it);
oheimb@5524
  1421
wenzelm@5127
  1422
* HOL/split_all_tac is now much faster and fails if there is nothing
wenzelm@5726
  1423
to split.  Some EXISTING PROOFS MAY REQUIRE ADAPTION because the order
wenzelm@5726
  1424
and the names of the automatically generated variables have changed.
wenzelm@5726
  1425
split_all_tac has moved within claset() from unsafe wrappers to safe
wenzelm@5726
  1426
wrappers, which means that !!-bound variables are split much more
wenzelm@5726
  1427
aggressively, and safe_tac and clarify_tac now split such variables.
wenzelm@5726
  1428
If this splitting is not appropriate, use delSWrapper "split_all_tac".
wenzelm@5726
  1429
Note: the same holds for record_split_tac, which does the job of
wenzelm@5726
  1430
split_all_tac for record fields.
wenzelm@5127
  1431
wenzelm@5726
  1432
* HOL/Simplifier: Rewrite rules for case distinctions can now be added
wenzelm@5726
  1433
permanently to the default simpset using Addsplits just like
wenzelm@5726
  1434
Addsimps. They can be removed via Delsplits just like
wenzelm@5726
  1435
Delsimps. Lower-case versions are also available.
wenzelm@5127
  1436
wenzelm@5726
  1437
* HOL/Simplifier: The rule split_if is now part of the default
wenzelm@5726
  1438
simpset. This means that the simplifier will eliminate all occurrences
wenzelm@5726
  1439
of if-then-else in the conclusion of a goal. To prevent this, you can
wenzelm@5726
  1440
either remove split_if completely from the default simpset by
wenzelm@5726
  1441
`Delsplits [split_if]' or remove it in a specific call of the
wenzelm@5726
  1442
simplifier using `... delsplits [split_if]'.  You can also add/delete
wenzelm@5726
  1443
other case splitting rules to/from the default simpset: every datatype
wenzelm@5726
  1444
generates suitable rules `split_t_case' and `split_t_case_asm' (where
wenzelm@5726
  1445
t is the name of the datatype).
wenzelm@5127
  1446
wenzelm@5726
  1447
* Classical reasoner / Simplifier combination: new force_tac (and
wenzelm@5127
  1448
derivatives Force_tac, force) combines rewriting and classical
wenzelm@5127
  1449
reasoning (and whatever other tools) similarly to auto_tac, but is
wenzelm@5726
  1450
aimed to solve the given subgoal completely.
wenzelm@5127
  1451
wenzelm@5127
  1452
wenzelm@5127
  1453
*** General ***
wenzelm@5127
  1454
wenzelm@5217
  1455
* new top-level commands `Goal' and `Goalw' that improve upon `goal'
wenzelm@5127
  1456
and `goalw': the theory is no longer needed as an explicit argument -
wenzelm@5127
  1457
the current theory context is used; assumptions are no longer returned
wenzelm@5127
  1458
at the ML-level unless one of them starts with ==> or !!; it is
wenzelm@5217
  1459
recommended to convert to these new commands using isatool fixgoal
wenzelm@5217
  1460
(backup your sources first!);
wenzelm@4842
  1461
wenzelm@5217
  1462
* new top-level commands 'thm' and 'thms' for retrieving theorems from
wenzelm@5207
  1463
the current theory context, and 'theory' to lookup stored theories;
paulson@4806
  1464
paulson@5722
  1465
* new theory section 'locale' for declaring constants, assumptions and
paulson@5722
  1466
definitions that have local scope;
paulson@5722
  1467
wenzelm@5127
  1468
* new theory section 'nonterminals' for purely syntactic types;
wenzelm@4858
  1469
wenzelm@5127
  1470
* new theory section 'setup' for generic ML setup functions
wenzelm@5127
  1471
(e.g. package initialization);
wenzelm@4869
  1472
wenzelm@5131
  1473
* the distribution now includes Isabelle icons: see
wenzelm@5131
  1474
lib/logo/isabelle-{small,tiny}.xpm;
wenzelm@5131
  1475
wenzelm@5363
  1476
* isatool install - install binaries with absolute references to
wenzelm@5363
  1477
ISABELLE_HOME/bin;
wenzelm@5363
  1478
wenzelm@5572
  1479
* isatool logo -- create instances of the Isabelle logo (as EPS);
wenzelm@5572
  1480
wenzelm@5407
  1481
* print mode 'emacs' reserved for Isamode;
wenzelm@5407
  1482
wenzelm@5726
  1483
* support multiple print (ast) translations per constant name;
wenzelm@5726
  1484
wenzelm@6925
  1485
* theorems involving oracles are now printed with a suffixed [!];
wenzelm@6925
  1486
wenzelm@4711
  1487
paulson@4661
  1488
*** HOL ***
paulson@4661
  1489
wenzelm@5710
  1490
* there is now a tutorial on Isabelle/HOL (do 'isatool doc tutorial');
nipkow@5709
  1491
wenzelm@5217
  1492
* HOL/inductive package reorganized and improved: now supports mutual
paulson@5267
  1493
definitions such as
wenzelm@5217
  1494
wenzelm@5217
  1495
  inductive EVEN ODD
wenzelm@5217
  1496
    intrs
wenzelm@5217
  1497
      null "0 : EVEN"
wenzelm@5217
  1498
      oddI "n : EVEN ==> Suc n : ODD"
wenzelm@5217
  1499
      evenI "n : ODD ==> Suc n : EVEN"
wenzelm@5217
  1500
wenzelm@5217
  1501
new theorem list "elims" contains an elimination rule for each of the
wenzelm@5217
  1502
recursive sets; inductive definitions now handle disjunctive premises
wenzelm@5217
  1503
correctly (also ZF);
berghofe@5214
  1504
wenzelm@5217
  1505
INCOMPATIBILITIES: requires Inductive as an ancestor; component
wenzelm@5217
  1506
"mutual_induct" no longer exists - the induction rule is always
wenzelm@5217
  1507
contained in "induct";
wenzelm@5217
  1508
wenzelm@5217
  1509
wenzelm@5217
  1510
* HOL/datatype package re-implemented and greatly improved: now
paulson@5267
  1511
supports mutually recursive datatypes such as
wenzelm@5217
  1512
wenzelm@5217
  1513
  datatype
wenzelm@5217
  1514
    'a aexp = IF_THEN_ELSE ('a bexp) ('a aexp) ('a aexp)
wenzelm@5217
  1515
            | SUM ('a aexp) ('a aexp)
wenzelm@5217
  1516
            | DIFF ('a aexp) ('a aexp)
wenzelm@5217
  1517
            | NUM 'a
wenzelm@5217
  1518
  and
wenzelm@5217
  1519
    'a bexp = LESS ('a aexp) ('a aexp)
wenzelm@5217
  1520
            | AND ('a bexp) ('a bexp)
wenzelm@5217
  1521
            | OR ('a bexp) ('a bexp)
wenzelm@5217
  1522
paulson@5267
  1523
as well as indirectly recursive datatypes such as
berghofe@5214
  1524
wenzelm@5217
  1525
  datatype
wenzelm@5217
  1526
    ('a, 'b) term = Var 'a
wenzelm@5217
  1527
                  | App 'b ((('a, 'b) term) list)
berghofe@5214
  1528
wenzelm@5217
  1529
The new tactic  mutual_induct_tac [<var_1>, ..., <var_n>] i  performs
wenzelm@5217
  1530
induction on mutually / indirectly recursive datatypes.
wenzelm@5217
  1531
wenzelm@5217
  1532
Primrec equations are now stored in theory and can be accessed via
wenzelm@5217
  1533
<function_name>.simps.
wenzelm@5217
  1534
wenzelm@5217
  1535
INCOMPATIBILITIES:
berghofe@5214
  1536
wenzelm@5217
  1537
  - Theories using datatypes must now have theory Datatype as an
wenzelm@5217
  1538
    ancestor.
wenzelm@5217
  1539
  - The specific <typename>.induct_tac no longer exists - use the
wenzelm@5217
  1540
    generic induct_tac instead.
berghofe@5226
  1541
  - natE has been renamed to nat.exhaust - use exhaust_tac
wenzelm@5217
  1542
    instead of res_inst_tac ... natE. Note that the variable
berghofe@5226
  1543
    names in nat.exhaust differ from the names in natE, this
wenzelm@5217
  1544
    may cause some "fragile" proofs to fail.
wenzelm@5217
  1545
  - The theorems split_<typename>_case and split_<typename>_case_asm
wenzelm@5217
  1546
    have been renamed to <typename>.split and <typename>.split_asm.
wenzelm@5217
  1547
  - Since default sorts of type variables are now handled correctly,
wenzelm@5217
  1548
    some datatype definitions may have to be annotated with explicit
wenzelm@5217
  1549
    sort constraints.
wenzelm@5217
  1550
  - Primrec definitions no longer require function name and type
wenzelm@5217
  1551
    of recursive argument.
berghofe@5214
  1552
wenzelm@5217
  1553
Consider using isatool fixdatatype to adapt your theories and proof
wenzelm@5217
  1554
scripts to the new package (backup your sources first!).
wenzelm@5217
  1555
wenzelm@5217
  1556
wenzelm@5726
  1557
* HOL/record package: considerably improved implementation; now
wenzelm@5726
  1558
includes concrete syntax for record types, terms, updates; theorems
wenzelm@5726
  1559
for surjective pairing and splitting !!-bound record variables; proof
wenzelm@5726
  1560
support is as follows:
wenzelm@5726
  1561
wenzelm@5726
  1562
  1) standard conversions (selectors or updates applied to record
wenzelm@5726
  1563
constructor terms) are part of the standard simpset;
wenzelm@5726
  1564
wenzelm@5726
  1565
  2) inject equations of the form ((x, y) = (x', y')) == x=x' & y=y' are
wenzelm@5726
  1566
made part of standard simpset and claset via addIffs;
wenzelm@5726
  1567
wenzelm@5726
  1568
  3) a tactic for record field splitting (record_split_tac) is part of
wenzelm@5726
  1569
the standard claset (addSWrapper);
wenzelm@5726
  1570
wenzelm@5726
  1571
To get a better idea about these rules you may retrieve them via
wenzelm@5726
  1572
something like 'thms "foo.simps"' or 'thms "foo.iffs"', where "foo" is
wenzelm@5726
  1573
the name of your record type.
wenzelm@5726
  1574
wenzelm@5726
  1575
The split tactic 3) conceptually simplifies by the following rule:
wenzelm@5726
  1576
wenzelm@5726
  1577
  "(!!x. PROP ?P x) == (!!a b. PROP ?P (a, b))"
wenzelm@5726
  1578
wenzelm@5726
  1579
Thus any record variable that is bound by meta-all will automatically
wenzelm@5726
  1580
blow up into some record constructor term, consequently the
wenzelm@5726
  1581
simplifications of 1), 2) apply.  Thus force_tac, auto_tac etc. shall
wenzelm@5726
  1582
solve record problems automatically.
wenzelm@5726
  1583
berghofe@5214
  1584
wenzelm@5125
  1585
* reorganized the main HOL image: HOL/Integ and String loaded by
wenzelm@5125
  1586
default; theory Main includes everything;
wenzelm@5125
  1587
paulson@5650
  1588
* automatic simplification of integer sums and comparisons, using cancellation;
paulson@5650
  1589
oheimb@5526
  1590
* added option_map_eq_Some and not_Some_eq to the default simpset and claset;
wenzelm@5127
  1591
wenzelm@5127
  1592
* added disj_not1 = "(~P | Q) = (P --> Q)" to the default simpset;
wenzelm@5127
  1593
wenzelm@5127
  1594
* many new identities for unions, intersections, set difference, etc.;
wenzelm@5127
  1595
wenzelm@5127
  1596
* expand_if, expand_split, expand_sum_case and expand_nat_case are now
wenzelm@5127
  1597
called split_if, split_split, split_sum_case and split_nat_case (to go
wenzelm@5127
  1598
with add/delsplits);
wenzelm@5125
  1599
wenzelm@5127
  1600
* HOL/Prod introduces simplification procedure unit_eq_proc rewriting
wenzelm@5127
  1601
(?x::unit) = (); this is made part of the default simpset, which COULD
wenzelm@5127
  1602
MAKE EXISTING PROOFS FAIL under rare circumstances (consider
wenzelm@5207
  1603
'Delsimprocs [unit_eq_proc];' as last resort); also note that
wenzelm@5207
  1604
unit_abs_eta_conv is added in order to counter the effect of
wenzelm@5207
  1605
unit_eq_proc on (%u::unit. f u), replacing it by f rather than by
wenzelm@5207
  1606
%u.f();
wenzelm@5125
  1607
wenzelm@5217
  1608
* HOL/Fun INCOMPATIBILITY: `inj_onto' is now called `inj_on' (which
wenzelm@5217
  1609
makes more sense);
berghofe@5109
  1610
paulson@5475
  1611
* HOL/Set INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
  1612
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
  1613
  disjointness reasoning but breaking a few old proofs.
paulson@5267
  1614
wenzelm@5217
  1615
* HOL/Relation INCOMPATIBILITY: renamed the relational operator r^-1
wenzelm@5217
  1616
to 'converse' from 'inverse' (for compatibility with ZF and some
wenzelm@5217
  1617
literature);
wenzelm@5085
  1618
wenzelm@5127
  1619
* HOL/recdef can now declare non-recursive functions, with {} supplied as
wenzelm@5127
  1620
the well-founded relation;
oheimb@4838
  1621
paulson@5490
  1622
* HOL/Set INCOMPATIBILITY: the complement of set A is now written -A instead of
paulson@5490
  1623
    Compl A.  The "Compl" syntax remains available as input syntax for this
paulson@5490
  1624
    release ONLY.
paulson@5490
  1625
wenzelm@5127
  1626
* HOL/Update: new theory of function updates:
wenzelm@5127
  1627
    f(a:=b) == %x. if x=a then b else f x
wenzelm@5127
  1628
may also be iterated as in f(a:=b,c:=d,...);
nipkow@5077
  1629
wenzelm@5127
  1630
* HOL/Vimage: new theory for inverse image of a function, syntax f-``B;
paulson@4899
  1631
nipkow@5282
  1632
* HOL/List:
nipkow@5282
  1633
  - new function list_update written xs[i:=v] that updates the i-th
nipkow@5282
  1634
    list position. May also be iterated as in xs[i:=a,j:=b,...].
nipkow@5428
  1635
  - new function `upt' written [i..j(] which generates the list
nipkow@5428
  1636
    [i,i+1,...,j-1], i.e. the upper bound is excluded. To include the upper
nipkow@5428
  1637
    bound write [i..j], which is a shorthand for [i..j+1(].
nipkow@5282
  1638
  - new lexicographic orderings and corresponding wellfoundedness theorems.
paulson@4779
  1639
wenzelm@5127
  1640
* HOL/Arith:
wenzelm@5127
  1641
  - removed 'pred' (predecessor) function;
wenzelm@5127
  1642
  - generalized some theorems about n-1;
wenzelm@5127
  1643
  - many new laws about "div" and "mod";
wenzelm@5127
  1644
  - new laws about greatest common divisors (see theory ex/Primes);
oheimb@4766
  1645
wenzelm@5127
  1646
* HOL/Relation: renamed the relational operator r^-1 "converse"
wenzelm@4842
  1647
instead of "inverse";
wenzelm@4711
  1648
nipkow@5651
  1649
* HOL/Induct/Multiset: a theory of multisets, including the wellfoundedness
nipkow@5651
  1650
  of the multiset ordering;
nipkow@5651
  1651
wenzelm@5127
  1652
* directory HOL/Real: a construction of the reals using Dedekind cuts
nipkow@5651
  1653
  (not included by default);
nipkow@4835
  1654
wenzelm@5127
  1655
* directory HOL/UNITY: Chandy and Misra's UNITY formalism;
wenzelm@4711
  1656
nipkow@5651
  1657
* directory HOL/Hoare: a new version of Hoare logic which permits many-sorted
nipkow@5651
  1658
  programs, i.e. different program variables may have different types.
nipkow@5651
  1659
paulson@5142
  1660
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
  1661
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
  1662
  Now rew can involve either definitions or equalities (either == or =).
wenzelm@5002
  1663
wenzelm@5363
  1664
paulson@4879
  1665
*** ZF ***
paulson@4879
  1666
paulson@5332
  1667
* theory Main includes everything; INCOMPATIBILITY: theory ZF.thy contains
paulson@5332
  1668
  only the theorems proved on ZF.ML;
paulson@5160
  1669
paulson@5475
  1670
* ZF INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
  1671
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
  1672
  disjointness reasoning but breaking a few old proofs.
paulson@5267
  1673
paulson@5160
  1674
* ZF/Update: new theory of function updates
paulson@5160
  1675
    with default rewrite rule  f(x:=y) ` z = if(z=x, y, f`z)
paulson@5160
  1676
  may also be iterated as in f(a:=b,c:=d,...);
paulson@5160
  1677
paulson@4879
  1678
* in  let x=t in u(x), neither t nor u(x) has to be an FOL term.
oheimb@4649
  1679
paulson@5142
  1680
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
  1681
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
  1682
  Now rew can involve either definitions or equalities (either == or =).
paulson@5142
  1683
paulson@5160
  1684
* case_tac provided for compatibility with HOL
paulson@5160
  1685
    (like the old excluded_middle_tac, but with subgoals swapped)
paulson@5160
  1686
wenzelm@4842
  1687
wenzelm@5127
  1688
*** Internal programming interfaces ***
wenzelm@5002
  1689
wenzelm@5251
  1690
* Pure: several new basic modules made available for general use, see
wenzelm@5251
  1691
also src/Pure/README;
wenzelm@5207
  1692
wenzelm@5008
  1693
* improved the theory data mechanism to support encapsulation (data
wenzelm@5008
  1694
kind name replaced by private Object.kind, acting as authorization
wenzelm@5373
  1695
key); new type-safe user interface via functor TheoryDataFun; generic
wenzelm@5373
  1696
print_data function becomes basically useless;
wenzelm@5002
  1697
wenzelm@5251
  1698
* removed global_names compatibility flag -- all theory declarations
wenzelm@5251
  1699
are qualified by default;
wenzelm@5251
  1700
wenzelm@5085
  1701
* module Pure/Syntax now offers quote / antiquote translation
wenzelm@5085
  1702
functions (useful for Hoare logic etc. with implicit dependencies);
wenzelm@5373
  1703
see HOL/ex/Antiquote for an example use;
wenzelm@5085
  1704
wenzelm@5127
  1705
* Simplifier now offers conversions (asm_)(full_)rewrite: simpset ->
wenzelm@5127
  1706
cterm -> thm;
wenzelm@5127
  1707
wenzelm@5207
  1708
* new tactical CHANGED_GOAL for checking that a tactic modifies a
wenzelm@5207
  1709
subgoal;
paulson@5142
  1710
wenzelm@5251
  1711
* Display.print_goals function moved to Locale.print_goals;
wenzelm@5251
  1712
wenzelm@5731
  1713
* standard print function for goals supports current_goals_markers
wenzelm@5731
  1714
variable for marking begin of proof, end of proof, start of goal; the
wenzelm@5731
  1715
default is ("", "", ""); setting current_goals_markers := ("<proof>",
wenzelm@5731
  1716
"</proof>", "<goal>") causes SGML like tagged proof state printing,
wenzelm@5731
  1717
for example;
wenzelm@5731
  1718
wenzelm@5002
  1719
wenzelm@5002
  1720
wenzelm@4410
  1721
New in Isabelle98 (January 1998)
wenzelm@4410
  1722
--------------------------------
wenzelm@4410
  1723
wenzelm@4410
  1724
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4410
  1725
wenzelm@4410
  1726
* changed lexical syntax of terms / types: dots made part of long
wenzelm@4410
  1727
identifiers, e.g. "%x.x" no longer possible, should be "%x. x";
wenzelm@4410
  1728
wenzelm@4410
  1729
* simpset (and claset) reference variable replaced by functions
wenzelm@4410
  1730
simpset / simpset_ref;
wenzelm@4410
  1731
wenzelm@4410
  1732
* no longer supports theory aliases (via merge) and non-trivial
wenzelm@4410
  1733
implicit merge of thms' signatures;
wenzelm@4410
  1734
wenzelm@4410
  1735
* most internal names of constants changed due to qualified names;
wenzelm@4410
  1736
wenzelm@4410
  1737
* changed Pure/Sequence interface (see Pure/seq.ML);
wenzelm@4410
  1738
wenzelm@3454
  1739
paulson@3715
  1740
*** General Changes ***
paulson@3715
  1741
wenzelm@4174
  1742
* hierachically structured name spaces (for consts, types, axms, thms
wenzelm@3943
  1743
etc.); new lexical class 'longid' (e.g. Foo.bar.x) may render much of
wenzelm@4108
  1744
old input syntactically incorrect (e.g. "%x.x"); COMPATIBILITY:
wenzelm@4108
  1745
isatool fixdots ensures space after dots (e.g. "%x. x"); set
wenzelm@4174
  1746
long_names for fully qualified output names; NOTE: ML programs
wenzelm@4174
  1747
(special tactics, packages etc.) referring to internal names may have
wenzelm@4174
  1748
to be adapted to cope with fully qualified names; in case of severe
wenzelm@4174
  1749
backward campatibility problems try setting 'global_names' at compile
wenzelm@4174
  1750
time to have enrything declared within a flat name space; one may also
wenzelm@4174
  1751
fine tune name declarations in theories via the 'global' and 'local'
wenzelm@4174
  1752
section;
wenzelm@4108
  1753
wenzelm@4108
  1754
* reimplemented the implicit simpset and claset using the new anytype
wenzelm@4108
  1755
data filed in signatures; references simpset:simpset ref etc. are
wenzelm@4108
  1756
replaced by functions simpset:unit->simpset and
wenzelm@4108
  1757
simpset_ref:unit->simpset ref; COMPATIBILITY: use isatool fixclasimp
wenzelm@4108
  1758
to patch your ML files accordingly;
paulson@3856
  1759
wenzelm@3857
  1760
* HTML output now includes theory graph data for display with Java
wenzelm@3857
  1761
applet or isatool browser; data generated automatically via isatool
wenzelm@3901
  1762
usedir (see -i option, ISABELLE_USEDIR_OPTIONS);
wenzelm@3857
  1763
paulson@3856
  1764
* defs may now be conditional; improved rewrite_goals_tac to handle
paulson@3856
  1765
conditional equations;
paulson@3856
  1766
wenzelm@4174
  1767
* defs now admits additional type arguments, using TYPE('a) syntax;
wenzelm@4174
  1768
wenzelm@3901
  1769
* theory aliases via merge (e.g. M=A+B+C) no longer supported, always
wenzelm@3901
  1770
creates a new theory node; implicit merge of thms' signatures is
wenzelm@4112
  1771
restricted to 'trivial' ones; COMPATIBILITY: one may have to use
wenzelm@3901
  1772
transfer:theory->thm->thm in (rare) cases;
wenzelm@3901
  1773
wenzelm@3968
  1774
* improved handling of draft signatures / theories; draft thms (and
wenzelm@3968
  1775
ctyps, cterms) are automatically promoted to real ones;
wenzelm@3968
  1776
wenzelm@3901
  1777
* slightly changed interfaces for oracles: admit many per theory, named
wenzelm@3901
  1778
(e.g. oracle foo = mlfun), additional name argument for invoke_oracle;
wenzelm@3901
  1779
wenzelm@3901
  1780
* print_goals: optional output of const types (set show_consts and
wenzelm@3901
  1781
show_types);
wenzelm@3851
  1782
wenzelm@4388
  1783
* improved output of warnings (###) and errors (***);
wenzelm@3697
  1784
paulson@4178
  1785
* subgoal_tac displays a warning if the new subgoal has type variables;
paulson@4178
  1786
paulson@3715
  1787
* removed old README and Makefiles;
wenzelm@3697
  1788
paulson@3856
  1789
* replaced print_goals_ref hook by print_current_goals_fn and result_error_fn;
wenzelm@3670
  1790
paulson@3715
  1791
* removed obsolete init_pps and init_database;
paulson@3715
  1792
paulson@3715
  1793
* deleted the obsolete tactical STATE, which was declared by
paulson@3715
  1794
    fun STATE tacfun st = tacfun st st;
paulson@3715
  1795
wenzelm@4388
  1796
* cd and use now support path variables, e.g. $ISABELLE_HOME, or ~
wenzelm@4388
  1797
(which abbreviates $HOME);
wenzelm@4269
  1798
wenzelm@4269
  1799
* changed Pure/Sequence interface (see Pure/seq.ML); COMPATIBILITY:
wenzelm@4269
  1800
use isatool fixseq to adapt your ML programs (this works for fully
wenzelm@4269
  1801
qualified references to the Sequence structure only!);
wenzelm@4269
  1802
wenzelm@4381
  1803
* use_thy no longer requires writable current directory; it always
wenzelm@4381
  1804
reloads .ML *and* .thy file, if either one is out of date;
wenzelm@4269
  1805
paulson@3715
  1806
paulson@3715
  1807
*** Classical Reasoner ***
paulson@3715
  1808
wenzelm@3744
  1809
* Clarify_tac, clarify_tac, clarify_step_tac, Clarify_step_tac: new
wenzelm@3744
  1810
tactics that use classical reasoning to simplify a subgoal without
wenzelm@3744
  1811
splitting it into several subgoals;
paulson@3715
  1812
paulson@3719
  1813
* Safe_tac: like safe_tac but uses the default claset;
paulson@3719
  1814
paulson@3715
  1815
paulson@3715
  1816
*** Simplifier ***
paulson@3715
  1817
paulson@3715
  1818
* added simplification meta rules:
paulson@3715
  1819
    (asm_)(full_)simplify: simpset -> thm -> thm;
paulson@3715
  1820
paulson@3715
  1821
* simplifier.ML no longer part of Pure -- has to be loaded by object
paulson@3715
  1822
logics (again);
paulson@3715
  1823
paulson@3715
  1824
* added prems argument to simplification procedures;
paulson@3715
  1825
paulson@4325
  1826
* HOL, FOL, ZF: added infix function `addsplits':
paulson@4325
  1827
  instead of `<simpset> setloop (split_tac <thms>)'
paulson@4325
  1828
  you can simply write `<simpset> addsplits <thms>'
paulson@4325
  1829
paulson@3715
  1830
paulson@3715
  1831
*** Syntax ***
paulson@3715
  1832
wenzelm@4174
  1833
* TYPE('a) syntax for type reflection terms;
wenzelm@4174
  1834
wenzelm@3985
  1835
* no longer handles consts with name "" -- declare as 'syntax' instead;
paulson@3856
  1836
paulson@3856
  1837
* pretty printer: changed order of mixfix annotation preference (again!);
wenzelm@3846
  1838
paulson@3715
  1839
* Pure: fixed idt/idts vs. pttrn/pttrns syntactic categories;
paulson@3715
  1840
paulson@3715
  1841
paulson@3715
  1842
*** HOL ***
paulson@3715
  1843
wenzelm@5726
  1844
* HOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  1845
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
  1846
nipkow@4035
  1847
* HOL/TLA: Stephan Merz's formalization of Lamport's Temporal Logic of Actions;
wenzelm@3985
  1848
wenzelm@3985
  1849
* HOL/Auth: new protocol proofs including some for the Internet
nipkow@4035
  1850
  protocol TLS;
wenzelm@3985
  1851
wenzelm@4125
  1852
* HOL/Map: new theory of `maps' a la VDM;
nipkow@3982
  1853
wenzelm@4335
  1854
* HOL/simplifier: simplification procedures nat_cancel_sums for
wenzelm@4335
  1855
cancelling out common nat summands from =, <, <= (in)equalities, or
wenzelm@4335
  1856
differences; simplification procedures nat_cancel_factor for
wenzelm@4335
  1857
cancelling common factor from =, <, <= (in)equalities over natural
wenzelm@4373
  1858
sums; nat_cancel contains both kinds of procedures, it is installed by
wenzelm@4373
  1859
default in Arith.thy -- this COULD MAKE EXISTING PROOFS FAIL;
wenzelm@4335
  1860
nipkow@3580
  1861
* HOL/simplifier: terms of the form
paulson@4325
  1862
  `? x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x)'  (or t=x)
nipkow@3580
  1863
  are rewritten to
nipkow@4035
  1864
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t)',
nipkow@4035
  1865
  and those of the form
paulson@4325
  1866
  `! x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x) --> R(x)'  (or t=x)
nipkow@4035
  1867
  are rewritten to
nipkow@4035
  1868
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t) --> R(t)',
nipkow@4035
  1869
nipkow@4035
  1870
* HOL/datatype
nipkow@4035
  1871
  Each datatype `t' now comes with a theorem `split_t_case' of the form
nipkow@3580
  1872
nipkow@4035
  1873
  P(t_case f1 ... fn x) =
nipkow@4035
  1874
     ( (!y1 ... ym1. x = C1 y1 ... ym1 --> P(f1 y1 ... ym1)) &
nipkow@4035
  1875
        ...
oheimb@4189
  1876
       (!y1 ... ymn. x = Cn y1 ... ymn --> P(f1 y1 ... ymn))
nipkow@4035
  1877
     )
nipkow@4035
  1878
oheimb@4930
  1879
  and a theorem `split_t_case_asm' of the form
oheimb@4189
  1880
oheimb@4189
  1881
  P(t_case f1 ... fn x) =
oheimb@4189
  1882
    ~( (? y1 ... ym1. x = C1 y1 ... ym1 & ~P(f1 y1 ... ym1)) |
oheimb@4189
  1883
        ...
oheimb@4189
  1884
       (? y1 ... ymn. x = Cn y1 ... ymn & ~P(f1 y1 ... ymn))
oheimb@4189
  1885
     )
oheimb@4930
  1886
  which can be added to a simpset via `addsplits'. The existing theorems
oheimb@4930
  1887
  expand_list_case and expand_option_case have been renamed to
oheimb@4930
  1888
  split_list_case and split_option_case.
oheimb@4189
  1889
nipkow@4361
  1890
* HOL/Arithmetic:
nipkow@4361
  1891
  - `pred n' is automatically converted to `n-1'.
nipkow@4361
  1892
    Users are strongly encouraged not to use `pred' any longer,
nipkow@4361
  1893
    because it will disappear altogether at some point.
nipkow@4361
  1894
  - Users are strongly encouraged to write "0 < n" rather than
nipkow@4361
  1895
    "n ~= 0". Theorems and proof tools have been modified towards this
nipkow@4361
  1896
    `standard'.
nipkow@4357
  1897
nipkow@4502
  1898
* HOL/Lists:
nipkow@4502
  1899
  the function "set_of_list" has been renamed "set" (and its theorems too);
nipkow@4502
  1900
  the function "nth" now takes its arguments in the reverse order and
nipkow@4502
  1901
  has acquired the infix notation "!" as in "xs!n".
paulson@3570
  1902
paulson@4154
  1903
* HOL/Set: UNIV is now a constant and is no longer translated to Compl{};
paulson@4154
  1904
paulson@4154
  1905
* HOL/Set: The operator (UN x.B x) now abbreviates (UN x:UNIV. B x) and its
paulson@4154
  1906
  specialist theorems (like UN1_I) are gone.  Similarly for (INT x.B x);
paulson@4154
  1907
wenzelm@4575
  1908
* HOL/record: extensible records with schematic structural subtyping
wenzelm@4575
  1909
(single inheritance); EXPERIMENTAL version demonstrating the encoding,
wenzelm@4575
  1910
still lacks various theorems and concrete record syntax;
wenzelm@4575
  1911
wenzelm@4125
  1912
paulson@3715
  1913
*** HOLCF ***
wenzelm@3535
  1914
wenzelm@4125
  1915
* removed "axioms" and "generated by" sections;
wenzelm@4125
  1916
oheimb@4123
  1917
* replaced "ops" section by extended "consts" section, which is capable of
wenzelm@4125
  1918
  handling the continuous function space "->" directly;
wenzelm@4125
  1919
wenzelm@4125
  1920
* domain package:
wenzelm@4125
  1921
  . proves theorems immediately and stores them in the theory,
wenzelm@4125
  1922
  . creates hierachical name space,
wenzelm@4125
  1923
  . now uses normal mixfix annotations (instead of cinfix...),
wenzelm@4125
  1924
  . minor changes to some names and values (for consistency),
wenzelm@4125
  1925
  . e.g. cases -> casedist, dists_eq -> dist_eqs, [take_lemma] -> take_lemmas,
wenzelm@4125
  1926
  . separator between mutual domain defs: changed "," to "and",
wenzelm@4125
  1927
  . improved handling of sort constraints;  now they have to
wenzelm@4125
  1928
    appear on the left-hand side of the equations only;
oheimb@4123
  1929
oheimb@4123
  1930
* fixed LAM <x,y,zs>.b syntax;
wenzelm@3567
  1931
wenzelm@3744
  1932
* added extended adm_tac to simplifier in HOLCF -- can now discharge
wenzelm@3744
  1933
adm (%x. P (t x)), where P is chainfinite and t continuous;
wenzelm@3579
  1934
wenzelm@3579
  1935
paulson@3719
  1936
*** FOL and ZF ***
paulson@3719
  1937
wenzelm@5726
  1938
* FOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  1939
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
  1940
wenzelm@3744
  1941
* qed_spec_mp, qed_goal_spec_mp, qed_goalw_spec_mp are available, as
wenzelm@3744
  1942
in HOL, they strip ALL and --> from proved theorems;
wenzelm@3744
  1943
paulson@3719
  1944
wenzelm@3579
  1945
wenzelm@3006
  1946
New in Isabelle94-8 (May 1997)
wenzelm@3006
  1947
------------------------------
wenzelm@2654
  1948
paulson@3002
  1949
*** General Changes ***
paulson@3002
  1950
paulson@3002
  1951
* new utilities to build / run / maintain Isabelle etc. (in parts
paulson@3002
  1952
still somewhat experimental); old Makefiles etc. still functional;
wenzelm@2971
  1953
wenzelm@3205
  1954
* new 'Isabelle System Manual';
wenzelm@3205
  1955
wenzelm@2825
  1956
* INSTALL text, together with ./configure and ./build scripts;
wenzelm@2773
  1957
wenzelm@3006
  1958
* reimplemented type inference for greater efficiency, better error
wenzelm@3006
  1959
messages and clean internal interface;
paulson@3002
  1960
paulson@3002
  1961
* prlim command for dealing with lots of subgoals (an easier way of
paulson@3002
  1962
setting goals_limit);
paulson@3002
  1963
wenzelm@3006
  1964
wenzelm@3006
  1965
*** Syntax ***
paulson@3002
  1966
wenzelm@3116
  1967
* supports alternative (named) syntax tables (parser and pretty
wenzelm@3116
  1968
printer); internal interface is provided by add_modesyntax(_i);
wenzelm@3116
  1969
paulson@3002
  1970
* Pure, FOL, ZF, HOL, HOLCF now support symbolic input and output; to
paulson@3002
  1971
be used in conjunction with the Isabelle symbol font; uses the
paulson@3002
  1972
"symbols" syntax table;
paulson@3002
  1973
wenzelm@2705
  1974
* added token_translation interface (may translate name tokens in
wenzelm@2756
  1975
arbitrary ways, dependent on their type (free, bound, tfree, ...) and
wenzelm@3116
  1976
the current print_mode); IMPORTANT: user print translation functions
wenzelm@3116
  1977
are responsible for marking newly introduced bounds
wenzelm@3116
  1978
(Syntax.mark_boundT);
wenzelm@2705
  1979
wenzelm@2730
  1980
* token translations for modes "xterm" and "xterm_color" that display
wenzelm@3006
  1981
names in bold, underline etc. or colors (which requires a color
wenzelm@3006
  1982
version of xterm);
wenzelm@2730
  1983
paulson@3002
  1984
* infixes may now be declared with names independent of their syntax;
paulson@3002
  1985
paulson@3002
  1986
* added typed_print_translation (like print_translation, but may
paulson@3002
  1987
access type of constant);
paulson@3002
  1988
wenzelm@3006
  1989
paulson@3002
  1990
*** Classical Reasoner ***
paulson@3002
  1991
paulson@3002
  1992
Blast_tac: a new tactic!  It is often more powerful than fast_tac, but has
paulson@3002
  1993
some limitations.  Blast_tac...
paulson@3002
  1994
  + ignores addss, addbefore, addafter; this restriction is intrinsic
paulson@3002
  1995
  + ignores elimination rules that don't have the correct format
wenzelm@5726
  1996
        (the conclusion MUST be a formula variable)
paulson@3002
  1997
  + ignores types, which can make HOL proofs fail
paulson@3002
  1998
  + rules must not require higher-order unification, e.g. apply_type in ZF
paulson@3002
  1999
    [message "Function Var's argument not a bound variable" relates to this]
paulson@3002
  2000
  + its proof strategy is more general but can actually be slower
paulson@3002
  2001
wenzelm@3107
  2002
* substitution with equality assumptions no longer permutes other
wenzelm@3107
  2003
assumptions;
paulson@3002
  2004
paulson@3002
  2005
* minor changes in semantics of addafter (now called addaltern); renamed
paulson@3002
  2006
setwrapper to setWrapper and compwrapper to compWrapper; added safe wrapper
wenzelm@3107
  2007
(and access functions for it);
paulson@3002
  2008
wenzelm@5726
  2009
* improved combination of classical reasoner and simplifier:
oheimb@3317
  2010
  + functions for handling clasimpsets
oheimb@3317
  2011
  + improvement of addss: now the simplifier is called _after_ the
oheimb@3317
  2012
    safe steps.
oheimb@3317
  2013
  + safe variant of addss called addSss: uses safe simplifications
wenzelm@5726
  2014
    _during_ the safe steps. It is more complete as it allows multiple
oheimb@3317
  2015
    instantiations of unknowns (e.g. with slow_tac).
wenzelm@3006
  2016
paulson@3002
  2017
*** Simplifier ***
paulson@3002
  2018
wenzelm@3006
  2019
* added interface for simplification procedures (functions that
wenzelm@3006
  2020
produce *proven* rewrite rules on the fly, depending on current
wenzelm@3006
  2021
redex);
wenzelm@3006
  2022
wenzelm@3006
  2023
* ordering on terms as parameter (used for ordered rewriting);
wenzelm@3006
  2024
wenzelm@3107
  2025
* new functions delcongs, deleqcongs, and Delcongs. richer rep_ss;
paulson@3002
  2026
paulson@3002
  2027
* the solver is now split into a safe and an unsafe part.
paulson@3002
  2028
This should be invisible for the normal user, except that the
paulson@3002
  2029
functions setsolver and addsolver have been renamed to setSolver and
wenzelm@3107
  2030
addSolver; added safe_asm_full_simp_tac;
paulson@3002
  2031
paulson@3002
  2032
paulson@3002
  2033
*** HOL ***
paulson@3002
  2034
nipkow@3042
  2035
* a generic induction tactic `induct_tac' which works for all datatypes and
wenzelm@3107
  2036
also for type `nat';
nipkow@3042
  2037
nipkow@3316
  2038
* a generic case distinction tactic `exhaust_tac' which works for all
nipkow@3316
  2039
datatypes and also for type `nat';
nipkow@3316
  2040
nipkow@3316
  2041
* each datatype comes with a function `size';
nipkow@3316
  2042
paulson@3002
  2043
* patterns in case expressions allow tuple patterns as arguments to
wenzelm@3107
  2044
constructors, for example `case x of [] => ... | (x,y,z)#ps => ...';
paulson@3002
  2045
paulson@3002
  2046
* primrec now also works with type nat;
paulson@3002
  2047
paulson@3338
  2048
* recdef: a new declaration form, allows general recursive functions to be
paulson@3338
  2049
defined in theory files.  See HOL/ex/Fib, HOL/ex/Primes, HOL/Subst/Unify.
paulson@3338
  2050
paulson@3002
  2051
* the constant for negation has been renamed from "not" to "Not" to
wenzelm@3107
  2052
harmonize with FOL, ZF, LK, etc.;
paulson@3002
  2053
wenzelm@3107
  2054
* HOL/ex/LFilter theory of a corecursive "filter" functional for
wenzelm@3107
  2055
infinite lists;
paulson@3002
  2056
wenzelm@3227
  2057
* HOL/Modelcheck demonstrates invocation of model checker oracle;
wenzelm@3227
  2058
paulson@3002
  2059
* HOL/ex/Ring.thy declares cring_simp, which solves equational
paulson@3002
  2060
problems in commutative rings, using axiomatic type classes for + and *;
paulson@3002
  2061
paulson@3002
  2062
* more examples in HOL/MiniML and HOL/Auth;
paulson@3002
  2063
paulson@3002
  2064
* more default rewrite rules for quantifiers, union/intersection;
paulson@3002
  2065
nipkow@3321
  2066
* a new constant `arbitrary == @x.False';
nipkow@3321
  2067
wenzelm@3107
  2068
* HOLCF/IOA replaces old HOL/IOA;
wenzelm@3107
  2069
wenzelm@5726
  2070
* HOLCF changes: derived all rules and arities
wenzelm@5726
  2071
  + axiomatic type classes instead of classes
slotosch@2653
  2072
  + typedef instead of faking type definitions
paulson@2747
  2073
  + eliminated the internal constants less_fun, less_cfun, UU_fun, UU_cfun etc.
wenzelm@2730
  2074
  + new axclasses cpo, chfin, flat with flat < chfin < pcpo < cpo < po
slotosch@2653
  2075
  + eliminated the types void, one, tr
slotosch@2653
  2076
  + use unit lift and bool lift (with translations) instead of one and tr
slotosch@2653
  2077
  + eliminated blift from Lift3.thy (use Def instead of blift)
wenzelm@3107
  2078
  all eliminated rules are derived as theorems --> no visible changes ;
oheimb@2649
  2079
wenzelm@3006
  2080
paulson@3002
  2081
*** ZF ***
wenzelm@2553
  2082
paulson@2865
  2083
* ZF now has Fast_tac, Simp_tac and Auto_tac.  Union_iff is a now a default
paulson@2865
  2084
rewrite rule; this may affect some proofs.  eq_cs is gone but can be put back
paulson@2865
  2085
as ZF_cs addSIs [equalityI];
wenzelm@2553
  2086
wenzelm@2554
  2087
wenzelm@2732
  2088
wenzelm@2553
  2089
New in Isabelle94-7 (November 96)
wenzelm@2553
  2090
---------------------------------
wenzelm@2553
  2091
wenzelm@2553
  2092
* allowing negative levels (as offsets) in prlev and choplev;
wenzelm@2553
  2093
wenzelm@2554
  2094
* super-linear speedup for large simplifications;
wenzelm@2554
  2095
wenzelm@2554
  2096
* FOL, ZF and HOL now use miniscoping: rewriting pushes
wenzelm@2554
  2097
quantifications in as far as possible (COULD MAKE EXISTING PROOFS
wenzelm@2554
  2098
FAIL); can suppress it using the command Delsimps (ex_simps @
wenzelm@2554
  2099
all_simps); De Morgan laws are also now included, by default;
wenzelm@2554
  2100
wenzelm@2554
  2101
* improved printing of ==>  :  ~:
wenzelm@2554
  2102
wenzelm@2554
  2103
* new object-logic "Sequents" adds linear logic, while replacing LK
wenzelm@2554
  2104
and Modal (thanks to Sara Kalvala);
wenzelm@2554
  2105
wenzelm@2554
  2106
* HOL/Auth: correctness proofs for authentication protocols;
wenzelm@2554
  2107
wenzelm@2554
  2108
* HOL: new auto_tac combines rewriting and classical reasoning (many
wenzelm@2554
  2109
examples on HOL/Auth);
wenzelm@2554
  2110
wenzelm@2554
  2111
* HOL: new command AddIffs for declaring theorems of the form P=Q to
wenzelm@2554
  2112
the rewriter and classical reasoner simultaneously;
wenzelm@2554
  2113
wenzelm@2554
  2114
* function uresult no longer returns theorems in "standard" format;
wenzelm@2554
  2115
regain previous version by: val uresult = standard o uresult;
wenzelm@2554
  2116
wenzelm@2554
  2117
wenzelm@2554
  2118
wenzelm@2554
  2119
New in Isabelle94-6
wenzelm@2554
  2120
-------------------
wenzelm@2554
  2121
wenzelm@2554
  2122
* oracles -- these establish an interface between Isabelle and trusted
wenzelm@2554
  2123
external reasoners, which may deliver results as theorems;
wenzelm@2554
  2124
wenzelm@2554
  2125
* proof objects (in particular record all uses of oracles);
wenzelm@2554
  2126
wenzelm@2554
  2127
* Simp_tac, Fast_tac, etc. that refer to implicit simpset / claset;
wenzelm@2554
  2128
wenzelm@2554
  2129
* "constdefs" section in theory files;
wenzelm@2554
  2130
wenzelm@2554
  2131
* "primrec" section (HOL) no longer requires names;
wenzelm@2554
  2132
wenzelm@2554
  2133
* internal type "tactic" now simply "thm -> thm Sequence.seq";
wenzelm@2554
  2134
wenzelm@2554
  2135
wenzelm@2554
  2136
wenzelm@2554
  2137
New in Isabelle94-5
wenzelm@2554
  2138
-------------------
wenzelm@2554
  2139
wenzelm@2554
  2140
* reduced space requirements;
wenzelm@2554
  2141
wenzelm@2554
  2142
* automatic HTML generation from theories;
wenzelm@2554
  2143
wenzelm@2554
  2144
* theory files no longer require "..." (quotes) around most types;
wenzelm@2554
  2145
wenzelm@2554
  2146
* new examples, including two proofs of the Church-Rosser theorem;
wenzelm@2554
  2147
wenzelm@2554
  2148
* non-curried (1994) version of HOL is no longer distributed;
wenzelm@2554
  2149
wenzelm@2553
  2150
paulson@2557
  2151
paulson@2557
  2152
New in Isabelle94-4
paulson@2557
  2153
-------------------
paulson@2557
  2154
paulson@2747
  2155
* greatly reduced space requirements;
paulson@2557
  2156
paulson@2557
  2157
* theory files (.thy) no longer require \...\ escapes at line breaks;
paulson@2557
  2158
wenzelm@5726
  2159
* searchable theorem database (see the section "Retrieving theorems" on
paulson@2557
  2160
page 8 of the Reference Manual);
paulson@2557
  2161
paulson@2557
  2162
* new examples, including Grabczewski's monumental case study of the
paulson@2557
  2163
Axiom of Choice;
paulson@2557
  2164
paulson@2557
  2165
* The previous version of HOL renamed to Old_HOL;
paulson@2557
  2166
wenzelm@5726
  2167
* The new version of HOL (previously called CHOL) uses a curried syntax
paulson@2557
  2168
for functions.  Application looks like f a b instead of f(a,b);
paulson@2557
  2169
paulson@2557
  2170
* Mutually recursive inductive definitions finally work in HOL;
paulson@2557
  2171
paulson@2557
  2172
* In ZF, pattern-matching on tuples is now available in all abstractions and
paulson@2557
  2173
translates to the operator "split";
paulson@2557
  2174
paulson@2557
  2175
paulson@2557
  2176
paulson@2557
  2177
New in Isabelle94-3
paulson@2557
  2178
-------------------
paulson@2557
  2179
wenzelm@5726
  2180
* new infix operator, addss, allowing the classical reasoner to
paulson@2557
  2181
perform simplification at each step of its search.  Example:
wenzelm@5726
  2182
        fast_tac (cs addss ss)
paulson@2557
  2183
wenzelm@5726
  2184
* a new logic, CHOL, the same as HOL, but with a curried syntax
wenzelm@5726
  2185
for functions.  Application looks like f a b instead of f(a,b).  Also pairs
paulson@2557
  2186
look like (a,b) instead of <a,b>;
paulson@2557
  2187
paulson@2557
  2188
* PLEASE NOTE: CHOL will eventually replace HOL!
paulson@2557
  2189
paulson@2557
  2190
* In CHOL, pattern-matching on tuples is now available in all abstractions.
paulson@2557
  2191
It translates to the operator "split".  A new theory of integers is available;
paulson@2557
  2192
paulson@2557
  2193
* In ZF, integer numerals now denote two's-complement binary integers.
paulson@2557
  2194
Arithmetic operations can be performed by rewriting.  See ZF/ex/Bin.ML;
paulson@2557
  2195
wenzelm@5726
  2196
* Many new examples: I/O automata, Church-Rosser theorem, equivalents
paulson@2557
  2197
of the Axiom of Choice;
paulson@2557
  2198
paulson@2557
  2199
paulson@2557
  2200
paulson@2557
  2201
New in Isabelle94-2
paulson@2557
  2202
-------------------
paulson@2557
  2203
wenzelm@5726
  2204
* Significantly faster resolution;
paulson@2557
  2205
paulson@2557
  2206
* the different sections in a .thy file can now be mixed and repeated
paulson@2557
  2207
freely;
paulson@2557
  2208
paulson@2557
  2209
* Database of theorems for FOL, HOL and ZF.  New
paulson@2557
  2210
commands including qed, qed_goal and bind_thm store theorems in the database.
paulson@2557
  2211
paulson@2557
  2212
* Simple database queries: return a named theorem (get_thm) or all theorems of
paulson@2557
  2213
a given theory (thms_of), or find out what theory a theorem was proved in
paulson@2557
  2214
(theory_of_thm);
paulson@2557
  2215
paulson@2557
  2216
* Bugs fixed in the inductive definition and datatype packages;
paulson@2557
  2217
paulson@2557
  2218
* The classical reasoner provides deepen_tac and depth_tac, making FOL_dup_cs
paulson@2557
  2219
and HOL_dup_cs obsolete;
paulson@2557
  2220
paulson@2557
  2221
* Syntactic ambiguities caused by the new treatment of syntax in Isabelle94-1
paulson@2557
  2222
have been removed;
paulson@2557
  2223
paulson@2557
  2224
* Simpler definition of function space in ZF;
paulson@2557
  2225
paulson@2557
  2226
* new results about cardinal and ordinal arithmetic in ZF;
paulson@2557
  2227
paulson@2557
  2228
* 'subtype' facility in HOL for introducing new types as subsets of existing
paulson@2557
  2229
types;
paulson@2557
  2230
paulson@2557
  2231
wenzelm@2553
  2232
$Id$