NEWS
author wenzelm
Mon Jan 21 17:03:38 2002 +0100 (2002-01-21)
changeset 12832 c31b44286a8a
parent 12777 70b2651af635
child 12837 74ce01905e57
permissions -rw-r--r--
* Pure/show_hyps reset by default (in accordance to existing Isar practice);
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Isabelle NEWS -- history user-relevant changes
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==============================================
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New in Isabelle2002 (January 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 Test && isatool make";
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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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  - 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; e.g. see HOL/ex/Locales.thy;
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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 now support ad-hoc contexts, which are discharged
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in the result, as in ``lemma (assumes A and B) K: A .''; syntax
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coincides with that of a locale body;
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* Pure: renamed "antecedent" case to "rule_context";
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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/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: 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: 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: 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 "comp"
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to "rel_comp"; INCOMPATIBILITY: a few theorems have been renamed accordingly
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(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/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
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your theory on Main_ZFC;
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* the integer library now covers quotients and remainders, with many
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laws relating division to addition, multiplication, etc.;
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* ZF/UNITY: Chandy and Misra's UNITY is now available in ZF, giving a
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typeless version of the formalism;
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* ZF/AC, Coind, IMP, Resid: updated and converted to new-style theory format;
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* ZF/Induct: new directory for examples of inductive definitions,
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including theory Multiset for multiset orderings; converted to
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new-style theory format;
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*** General ***
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* Pure/kernel: meta-level proof terms (by Stefan Berghofer); reference
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variable proof controls level of detail: 0 = no proofs (only oracle
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dependencies), 1 = lemma dependencies, 2 = compact proof terms; see
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also ref manual for further ML interfaces;
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* Pure/axclass: removed obsolete ML interface
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goal_subclass/goal_arity;
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* Pure/syntax: new token syntax "num" for plain numerals (without "#"
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of "xnum"); potential INCOMPATIBILITY, since -0, -1 etc. are now
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separate tokens, so expressions involving minus need to be spaced
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properly;
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* Pure/syntax: support non-oriented infixes, using keyword "infix"
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rather than "infixl" or "infixr";
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* Pure/syntax: concrete syntax for dummy type variables admits genuine
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sort constraint specifications in type inference; e.g. "x::_::foo"
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ensures that the type of "x" is of sort "foo" (but not necessarily a
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type variable);
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* Pure/syntax: print modes "type_brackets" and "no_type_brackets"
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control output of nested => (types); the default behavior is
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"type_brackets";
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* Pure/syntax: builtin parse translation for "_constify" turns valued
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tokens into AST constants;
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* Pure/syntax: prefer later declarations of translations and print
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translation functions; potential INCOMPATIBILITY: need to reverse
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multiple declarations for same syntax element constant;
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* Pure/show_hyps reset by default (in accordance to existing Isar
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practice);
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* Provers/classical: renamed addaltern to addafter, addSaltern to
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addSafter;
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* Provers/clasimp: ``iff'' declarations now handle conditional rules
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as well;
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* system: tested support for MacOS X; should be able to get Isabelle +
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Proof General to work in a plain Terminal after installing Poly/ML
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(e.g. from the Isabelle distribution area) and GNU bash alone
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(e.g. from http://www.apple.com); full X11, XEmacs and X-Symbol
wenzelm@12538
   348
support requires further installations, e.g. from
wenzelm@12538
   349
http://fink.sourceforge.net/);
wenzelm@12538
   350
wenzelm@12280
   351
* system: support Poly/ML 4.1.1 (able to manage larger heaps);
wenzelm@11551
   352
wenzelm@12753
   353
* system: reduced base memory usage by Poly/ML (approx. 20 MB instead
wenzelm@12753
   354
of 40 MB), cf. ML_OPTIONS;
wenzelm@12753
   355
wenzelm@11633
   356
* system: Proof General keywords specification is now part of the
wenzelm@11633
   357
Isabelle distribution (see etc/isar-keywords.el);
wenzelm@11633
   358
wenzelm@12728
   359
* system: support for persistent Proof General sessions (refrain from
wenzelm@12728
   360
outdating all loaded theories on startup); user may create writable
wenzelm@12728
   361
logic images like this: ``isabelle -q HOL Test'';
wenzelm@12597
   362
wenzelm@11551
   363
* system: smart selection of Isabelle process versus Isabelle
wenzelm@11572
   364
interface, accommodates case-insensitive file systems (e.g. HFS+); may
wenzelm@11572
   365
run both "isabelle" and "Isabelle" even if file names are badly
wenzelm@11572
   366
damaged (executable inspects the case of the first letter of its own
wenzelm@11572
   367
name); added separate "isabelle-process" and "isabelle-interface";
wenzelm@11551
   368
wenzelm@12472
   369
* system: refrain from any attempt at filtering input streams; no
wenzelm@12472
   370
longer support ``8bit'' encoding of old isabelle font, instead proper
wenzelm@12472
   371
iso-latin characters may now be used; the related isatools
wenzelm@12472
   372
"symbolinput" and "nonascii" have disappeared as well;
wenzelm@12472
   373
wenzelm@12472
   374
* system: removed old "xterm" interface (the print modes "xterm" and
wenzelm@12472
   375
"xterm_color" are still available for direct use in a suitable
wenzelm@12472
   376
terminal);
wenzelm@12472
   377
paulson@11314
   378
oheimb@11169
   379
wenzelm@11062
   380
New in Isabelle99-2 (February 2001)
wenzelm@11062
   381
-----------------------------------
wenzelm@11062
   382
nipkow@10224
   383
*** Overview of INCOMPATIBILITIES ***
nipkow@10224
   384
paulson@11241
   385
* HOL: please note that theories in the Library and elsewhere often use the
paulson@11241
   386
new-style (Isar) format; to refer to their theorems in an ML script you must
wenzelm@12622
   387
bind them to ML identifers by e.g.      val thm_name = thm "thm_name";
paulson@11241
   388
wenzelm@11043
   389
* HOL: inductive package no longer splits induction rule aggressively,
wenzelm@11043
   390
but only as far as specified by the introductions given; the old
oheimb@11130
   391
format may be recovered via ML function complete_split_rule or attribute
wenzelm@11043
   392
'split_rule (complete)';
wenzelm@11043
   393
wenzelm@10998
   394
* HOL: induct renamed to lfp_induct, lfp_Tarski to lfp_unfold,
wenzelm@10998
   395
gfp_Tarski to gfp_unfold;
nipkow@10224
   396
paulson@10288
   397
* HOL: contrapos, contrapos2 renamed to contrapos_nn, contrapos_pp;
paulson@10288
   398
wenzelm@10858
   399
* HOL: infix "dvd" now has priority 50 rather than 70 (because it is a
wenzelm@10858
   400
relation); infix "^^" has been renamed "``"; infix "``" has been
wenzelm@10858
   401
renamed "`"; "univalent" has been renamed "single_valued";
nipkow@10793
   402
wenzelm@10998
   403
* HOL/Real: "rinv" and "hrinv" replaced by overloaded "inverse"
wenzelm@10998
   404
operation;
wenzelm@10998
   405
nipkow@10868
   406
* HOLCF: infix "`" has been renamed "$"; the symbol syntax is \<cdot>;
nipkow@10856
   407
wenzelm@10391
   408
* Isar: 'obtain' no longer declares "that" fact as simp/intro;
wenzelm@10391
   409
wenzelm@10401
   410
* Isar/HOL: method 'induct' now handles non-atomic goals; as a
wenzelm@10401
   411
consequence, it is no longer monotonic wrt. the local goal context
wenzelm@10401
   412
(which is now passed through the inductive cases);
wenzelm@10401
   413
wenzelm@10976
   414
* Document preparation: renamed standard symbols \<ll> to \<lless> and
wenzelm@10976
   415
\<gg> to \<ggreater>;
wenzelm@10976
   416
nipkow@10224
   417
wenzelm@10245
   418
*** Document preparation ***
wenzelm@10245
   419
wenzelm@10858
   420
* \isabellestyle{NAME} selects version of Isabelle output (currently
wenzelm@10858
   421
available: are "it" for near math-mode best-style output, "sl" for
wenzelm@10858
   422
slanted text style, and "tt" for plain type-writer; if no
wenzelm@10858
   423
\isabellestyle command is given, output is according to slanted
wenzelm@10858
   424
type-writer);
wenzelm@10858
   425
wenzelm@10322
   426
* support sub/super scripts (for single symbols only), input syntax is
wenzelm@10322
   427
like this: "A\<^sup>*" or "A\<^sup>\<star>";
wenzelm@10322
   428
wenzelm@10858
   429
* some more standard symbols; see Appendix A of the system manual for
wenzelm@11062
   430
the complete list of symbols defined in isabellesym.sty;
wenzelm@10858
   431
wenzelm@10998
   432
* improved isabelle style files; more abstract symbol implementation
wenzelm@10998
   433
(should now use \isamath{...} and \isatext{...} in custom symbol
wenzelm@10998
   434
definitions);
wenzelm@10998
   435
wenzelm@10634
   436
* antiquotation @{goals} and @{subgoals} for output of *dynamic* goals
wenzelm@10634
   437
state; Note that presentation of goal states does not conform to
wenzelm@10634
   438
actual human-readable proof documents.  Please do not include goal
wenzelm@10634
   439
states into document output unless you really know what you are doing!
wenzelm@10322
   440
wenzelm@11062
   441
* proper indentation of antiquoted output with proportional LaTeX
wenzelm@11062
   442
fonts;
wenzelm@10862
   443
wenzelm@11050
   444
* no_document ML operator temporarily disables LaTeX document
wenzelm@11050
   445
generation;
wenzelm@11050
   446
wenzelm@11062
   447
* isatool unsymbolize tunes sources for plain ASCII communication;
wenzelm@11062
   448
wenzelm@10322
   449
wenzelm@10306
   450
*** Isar ***
wenzelm@10306
   451
wenzelm@10547
   452
* Pure: Isar now suffers initial goal statements to contain unbound
wenzelm@10547
   453
schematic variables (this does not conform to actual readable proof
wenzelm@10547
   454
documents, due to unpredictable outcome and non-compositional proof
wenzelm@10547
   455
checking); users who know what they are doing may use schematic goals
wenzelm@10547
   456
for Prolog-style synthesis of proven results;
wenzelm@10547
   457
wenzelm@10391
   458
* Pure: assumption method (an implicit finishing) now handles actual
wenzelm@10391
   459
rules as well;
wenzelm@10391
   460
wenzelm@10391
   461
* Pure: improved 'obtain' --- moved to Pure, insert "that" into
wenzelm@10391
   462
initial goal, declare "that" only as Pure intro (only for single
wenzelm@10391
   463
steps); the "that" rule assumption may now be involved in implicit
wenzelm@10391
   464
finishing, thus ".." becomes a feasible for trivial obtains;
wenzelm@10391
   465
wenzelm@10391
   466
* Pure: default proof step now includes 'intro_classes'; thus trivial
wenzelm@10391
   467
instance proofs may be performed by "..";
wenzelm@10391
   468
wenzelm@10391
   469
* Pure: ?thesis / ?this / "..." now work for pure meta-level
wenzelm@10391
   470
statements as well;
wenzelm@10306
   471
wenzelm@11097
   472
* Pure: more robust selection of calculational rules;
wenzelm@11097
   473
wenzelm@10858
   474
* Pure: the builtin notion of 'finished' goal now includes the ==-refl
wenzelm@10858
   475
rule (as well as the assumption rule);
wenzelm@10858
   476
wenzelm@10858
   477
* Pure: 'thm_deps' command visualizes dependencies of theorems and
wenzelm@10858
   478
lemmas, using the graph browser tool;
wenzelm@10858
   479
wenzelm@10944
   480
* Pure: predict failure of "show" in interactive mode;
wenzelm@10944
   481
wenzelm@11016
   482
* Pure: 'thms_containing' now takes actual terms as arguments;
wenzelm@11016
   483
wenzelm@10401
   484
* HOL: improved method 'induct' --- now handles non-atomic goals
wenzelm@10401
   485
(potential INCOMPATIBILITY); tuned error handling;
wenzelm@10401
   486
wenzelm@10557
   487
* HOL: cases and induct rules now provide explicit hints about the
wenzelm@10547
   488
number of facts to be consumed (0 for "type" and 1 for "set" rules);
wenzelm@10547
   489
any remaining facts are inserted into the goal verbatim;
wenzelm@10547
   490
wenzelm@10858
   491
* HOL: local contexts (aka cases) may now contain term bindings as
wenzelm@10858
   492
well; the 'cases' and 'induct' methods new provide a ?case binding for
wenzelm@10858
   493
the result to be shown in each case;
wenzelm@10858
   494
wenzelm@10770
   495
* HOL: added 'recdef_tc' command;
wenzelm@10770
   496
wenzelm@11016
   497
* isatool convert assists in eliminating legacy ML scripts;
wenzelm@11016
   498
wenzelm@10306
   499
wenzelm@10245
   500
*** HOL ***
wenzelm@10245
   501
wenzelm@10245
   502
* HOL/Library: a collection of generic theories to be used together
wenzelm@10245
   503
with main HOL; the theory loader path already includes this directory
wenzelm@10245
   504
by default; the following existing theories have been moved here:
wenzelm@10245
   505
HOL/Induct/Multiset, HOL/Induct/Acc (as Accessible_Part), HOL/While
wenzelm@10337
   506
(as While_Combinator), HOL/Lex/Prefix (as List_Prefix);
wenzelm@10245
   507
wenzelm@10966
   508
* HOL/Unix: "Some aspects of Unix file-system security", a typical
wenzelm@10966
   509
modelling and verification task performed in Isabelle/HOL +
wenzelm@10966
   510
Isabelle/Isar + Isabelle document preparation (by Markus Wenzel).
wenzelm@10966
   511
wenzelm@11094
   512
* HOL/Algebra: special summation operator SUM no longer exists, it has
wenzelm@11094
   513
been replaced by setsum; infix 'assoc' now has priority 50 (like
wenzelm@11094
   514
'dvd'); axiom 'one_not_zero' has been moved from axclass 'ring' to
wenzelm@11094
   515
'domain', this makes the theory consistent with mathematical
wenzelm@11094
   516
literature;
wenzelm@11094
   517
wenzelm@10514
   518
* HOL basics: added overloaded operations "inverse" and "divide"
wenzelm@10726
   519
(infix "/"), syntax for generic "abs" operation, generic summation
wenzelm@11094
   520
operator \<Sum>;
wenzelm@10452
   521
wenzelm@10391
   522
* HOL/typedef: simplified package, provide more useful rules (see also
wenzelm@10391
   523
HOL/subset.thy);
wenzelm@10391
   524
wenzelm@10915
   525
* HOL/datatype: induction rule for arbitrarily branching datatypes is
wenzelm@10915
   526
now expressed as a proper nested rule (old-style tactic scripts may
wenzelm@10915
   527
require atomize_strip_tac to cope with non-atomic premises);
wenzelm@10915
   528
wenzelm@10915
   529
* HOL: renamed theory "Prod" to "Product_Type", renamed "split" rule
wenzelm@10915
   530
to "split_conv" (old name still available for compatibility);
wenzelm@10915
   531
wenzelm@10915
   532
* HOL: improved concrete syntax for strings (e.g. allows translation
wenzelm@10915
   533
rules with string literals);
wenzelm@10915
   534
paulson@12245
   535
* HOL-Real-Hyperreal: this extends HOL-Real with the hyperreals
paulson@12245
   536
 and Fleuriot's mechanization of analysis, including the transcendental
paulson@12245
   537
 functions for the reals;
paulson@10756
   538
wenzelm@11094
   539
* HOL/Real, HOL/Hyperreal: improved arithmetic simplification;
wenzelm@10391
   540
wenzelm@10858
   541
paulson@10474
   542
*** CTT ***
paulson@10474
   543
wenzelm@10547
   544
* CTT: x-symbol support for Pi, Sigma, -->, : (membership); note that
wenzelm@10547
   545
"lam" is displayed as TWO lambda-symbols
paulson@10474
   546
wenzelm@10547
   547
* CTT: theory Main now available, containing everything (that is, Bool
wenzelm@10547
   548
and Arith);
wenzelm@10547
   549
paulson@10474
   550
wenzelm@10391
   551
*** General ***
wenzelm@10391
   552
wenzelm@10547
   553
* Pure: the Simplifier has been implemented properly as a derived rule
wenzelm@10547
   554
outside of the actual kernel (at last!); the overall performance
wenzelm@10547
   555
penalty in practical applications is about 50%, while reliability of
wenzelm@10547
   556
the Isabelle inference kernel has been greatly improved;
wenzelm@10547
   557
wenzelm@11112
   558
* print modes "brackets" and "no_brackets" control output of nested =>
wenzelm@11112
   559
(types) and ==> (props); the default behaviour is "brackets";
wenzelm@11112
   560
wenzelm@10391
   561
* Provers: fast_tac (and friends) now handle actual object-logic rules
wenzelm@10391
   562
as assumptions as well;
wenzelm@10391
   563
wenzelm@11124
   564
* system: support Poly/ML 4.0;
wenzelm@11124
   565
wenzelm@11124
   566
* system: isatool install handles KDE version 1 or 2;
wenzelm@11124
   567
wenzelm@10391
   568
wenzelm@10245
   569
wenzelm@10103
   570
New in Isabelle99-1 (October 2000)
wenzelm@10103
   571
----------------------------------
wenzelm@8015
   572
wenzelm@10003
   573
*** Overview of INCOMPATIBILITIES ***
paulson@8014
   574
wenzelm@8848
   575
* HOL: simplification of natural numbers is much changed; to partly
wenzelm@8848
   576
recover the old behaviour (e.g. to prevent n+n rewriting to #2*n)
wenzelm@8848
   577
issue the following ML commands:
wenzelm@8848
   578
wenzelm@8848
   579
  Delsimprocs Nat_Numeral_Simprocs.cancel_numerals;
wenzelm@8848
   580
  Delsimprocs [Nat_Numeral_Simprocs.combine_numerals];
paulson@8788
   581
wenzelm@10129
   582
* HOL: simplification no longer dives into case-expressions; this is
wenzelm@10129
   583
controlled by "t.weak_case_cong" for each datatype t;
wenzelm@10003
   584
wenzelm@10003
   585
* HOL: nat_less_induct renamed to less_induct;
wenzelm@10003
   586
wenzelm@10003
   587
* HOL: systematic renaming of the SOME (Eps) rules, may use isatool
wenzelm@10003
   588
fixsome to patch .thy and .ML sources automatically;
paulson@8967
   589
wenzelm@10003
   590
  select_equality  -> some_equality
wenzelm@10003
   591
  select_eq_Ex     -> some_eq_ex
wenzelm@10003
   592
  selectI2EX       -> someI2_ex
wenzelm@10003
   593
  selectI2         -> someI2
wenzelm@10003
   594
  selectI          -> someI
wenzelm@10003
   595
  select1_equality -> some1_equality
wenzelm@10003
   596
  Eps_sym_eq       -> some_sym_eq_trivial
wenzelm@10003
   597
  Eps_eq           -> some_eq_trivial
wenzelm@10003
   598
wenzelm@10003
   599
* HOL: exhaust_tac on datatypes superceded by new generic case_tac;
wenzelm@10003
   600
wenzelm@10003
   601
* HOL: removed obsolete theorem binding expand_if (refer to split_if
wenzelm@10003
   602
instead);
wenzelm@10003
   603
wenzelm@10003
   604
* HOL: the recursion equations generated by 'recdef' are now called
wenzelm@10003
   605
f.simps instead of f.rules;
wenzelm@10003
   606
wenzelm@10003
   607
* HOL: qed_spec_mp now also handles bounded ALL as well;
wenzelm@10003
   608
wenzelm@10003
   609
* HOL: 0 is now overloaded, so the type constraint ":: nat" may
wenzelm@10003
   610
sometimes be needed;
wenzelm@10003
   611
wenzelm@10003
   612
* HOL: the constant for "f``x" is now "image" rather than "op ``";
paulson@8014
   613
paulson@10065
   614
* HOL: the constant for "f-``x" is now "vimage" rather than "op -``";
paulson@10065
   615
wenzelm@9330
   616
* HOL: the disjoint sum is now "<+>" instead of "Plus"; the cartesian
wenzelm@9330
   617
product is now "<*>" instead of "Times"; the lexicographic product is
wenzelm@9330
   618
now "<*lex*>" instead of "**";
nipkow@8705
   619
wenzelm@10003
   620
* HOL: theory Sexp is now in HOL/Induct examples (it used to be part
wenzelm@10003
   621
of main HOL, but was unused); better use HOL's datatype package;
paulson@9971
   622
wenzelm@10137
   623
* HOL: removed "symbols" syntax for constant "override" of theory Map;
wenzelm@10137
   624
the old syntax may be recovered as follows:
wenzelm@10137
   625
wenzelm@10137
   626
  syntax (symbols)
wenzelm@10137
   627
    override  :: "('a ~=> 'b) => ('a ~=> 'b) => ('a ~=> 'b)"
wenzelm@10137
   628
      (infixl "\\<oplus>" 100)
wenzelm@10137
   629
wenzelm@8848
   630
* HOL/Real: "rabs" replaced by overloaded "abs" function;
wenzelm@8848
   631
wenzelm@8887
   632
* HOL/ML: even fewer consts are declared as global (see theories Ord,
wenzelm@8887
   633
Lfp, Gfp, WF); this only affects ML packages that refer to const names
wenzelm@8887
   634
internally;
wenzelm@8887
   635
wenzelm@10003
   636
* HOL and ZF: syntax for quotienting wrt an equivalence relation
wenzelm@10003
   637
changed from A/r to A//r;
wenzelm@9908
   638
wenzelm@10003
   639
* ZF: new treatment of arithmetic (nat & int) may break some old
wenzelm@10003
   640
proofs;
wenzelm@8921
   641
wenzelm@10003
   642
* Isar: renamed some attributes (RS -> THEN, simplify -> simplified,
wenzelm@10003
   643
rulify -> rule_format, elimify -> elim_format, ...);
paulson@9542
   644
wenzelm@9941
   645
* Isar/Provers: intro/elim/dest attributes changed; renamed
wenzelm@9941
   646
intro/intro!/intro!! flags to intro!/intro/intro? (in most cases, one
wenzelm@9937
   647
should have to change intro!! to intro? only); replaced "delrule" by
wenzelm@9937
   648
"rule del";
wenzelm@9437
   649
wenzelm@9612
   650
* Isar/HOL: renamed "intrs" to "intros" in inductive definitions;
wenzelm@9612
   651
wenzelm@9437
   652
* Provers: strengthened force_tac by using new first_best_tac;
oheimb@9402
   653
wenzelm@10003
   654
* LaTeX document preparation: several changes of isabelle.sty (see
wenzelm@10003
   655
lib/texinputs);
wenzelm@8729
   656
paulson@8014
   657
wenzelm@8487
   658
*** Document preparation ***
wenzelm@8358
   659
wenzelm@9198
   660
* formal comments (text blocks etc.) in new-style theories may now
wenzelm@9753
   661
contain antiquotations of thm/prop/term/typ/text to be presented
wenzelm@9753
   662
according to latex print mode; concrete syntax is like this:
wenzelm@9753
   663
@{term[show_types] "f(x) = a + x"};
wenzelm@9198
   664
wenzelm@8358
   665
* isatool mkdir provides easy setup of Isabelle session directories,
wenzelm@8518
   666
including proper document sources;
wenzelm@8358
   667
wenzelm@8358
   668
* generated LaTeX sources are now deleted after successful run
wenzelm@8358
   669
(isatool document -c); may retain a copy somewhere else via -D option
wenzelm@8358
   670
of isatool usedir;
wenzelm@8358
   671
wenzelm@8566
   672
* isatool usedir -D now lets isatool latex -o sty update the Isabelle
wenzelm@10003
   673
style files, achieving self-contained LaTeX sources and simplifying
wenzelm@10003
   674
LaTeX debugging;
wenzelm@8566
   675
wenzelm@8518
   676
* old-style theories now produce (crude) LaTeX output as well;
wenzelm@8358
   677
wenzelm@9057
   678
* browser info session directories are now self-contained (may be put
wenzelm@9437
   679
on WWW server seperately); improved graphs of nested sessions; removed
wenzelm@9437
   680
graph for 'all sessions';
wenzelm@9057
   681
wenzelm@10003
   682
* several improvements in isabelle style files; \isabellestyle{it}
wenzelm@10003
   683
produces fake math mode output; \isamarkupheader is now \section by
wenzelm@10003
   684
default; see lib/texinputs/isabelle.sty etc.;
wenzelm@9489
   685
wenzelm@8358
   686
wenzelm@8184
   687
*** Isar ***
wenzelm@8184
   688
wenzelm@10003
   689
* Isar/Pure: local results and corresponding term bindings are now
wenzelm@10003
   690
subject to Hindley-Milner polymorphism (similar to ML); this
wenzelm@10003
   691
accommodates incremental type-inference very nicely;
wenzelm@8283
   692
wenzelm@10003
   693
* Isar/Pure: new derived language element 'obtain' supports
wenzelm@10003
   694
generalized existence reasoning;
wenzelm@8621
   695
wenzelm@10003
   696
* Isar/Pure: new calculational elements 'moreover' and 'ultimately'
wenzelm@10003
   697
support accumulation of results, without applying any rules yet;
wenzelm@10003
   698
useful to collect intermediate results without explicit name
wenzelm@10003
   699
references, and for use with transitivity rules with more than 2
wenzelm@10003
   700
premises;
wenzelm@8184
   701
wenzelm@10003
   702
* Isar/Pure: scalable support for case-analysis type proofs: new
wenzelm@10003
   703
'case' language element refers to local contexts symbolically, as
wenzelm@10003
   704
produced by certain proof methods; internally, case names are attached
wenzelm@10003
   705
to theorems as "tags";
wenzelm@8440
   706
wenzelm@10003
   707
* Isar/Pure: theory command 'hide' removes declarations from
wenzelm@9330
   708
class/type/const name spaces;
wenzelm@9330
   709
wenzelm@10003
   710
* Isar/Pure: theory command 'defs' supports option "(overloaded)" to
wenzelm@9330
   711
indicate potential overloading;
wenzelm@9330
   712
wenzelm@10003
   713
* Isar/Pure: changed syntax of local blocks from {{ }} to { };
wenzelm@8621
   714
wenzelm@10003
   715
* Isar/Pure: syntax of sorts made 'inner', i.e. have to write
wenzelm@10003
   716
"{a,b,c}" instead of {a,b,c};
wenzelm@9011
   717
wenzelm@10003
   718
* Isar/Pure now provides its own version of intro/elim/dest
wenzelm@10003
   719
attributes; useful for building new logics, but beware of confusion
wenzelm@10003
   720
with the version in Provers/classical;
wenzelm@9612
   721
wenzelm@10003
   722
* Isar/Pure: the local context of (non-atomic) goals is provided via
wenzelm@10003
   723
case name 'antecedent';
wenzelm@8440
   724
wenzelm@10003
   725
* Isar/Pure: removed obsolete 'transfer' attribute (transfer of thms
wenzelm@10003
   726
to the current context is now done automatically);
wenzelm@9383
   727
wenzelm@10003
   728
* Isar/Pure: theory command 'method_setup' provides a simple interface
wenzelm@10003
   729
for definining proof methods in ML;
wenzelm@9612
   730
wenzelm@10003
   731
* Isar/Provers: intro/elim/dest attributes changed; renamed
wenzelm@9941
   732
intro/intro!/intro!! flags to intro!/intro/intro? (INCOMPATIBILITY, in
wenzelm@9941
   733
most cases, one should have to change intro!! to intro? only);
wenzelm@9941
   734
replaced "delrule" by "rule del";
wenzelm@8283
   735
wenzelm@10003
   736
* Isar/Provers: new 'hypsubst' method, plain 'subst' method and
wenzelm@10003
   737
'symmetric' attribute (the latter supercedes [RS sym]);
wenzelm@10003
   738
wenzelm@10003
   739
* Isar/Provers: splitter support (via 'split' attribute and 'simp'
wenzelm@10003
   740
method modifier); 'simp' method: 'only:' modifier removes loopers as
wenzelm@10003
   741
well (including splits);
wenzelm@10003
   742
wenzelm@10003
   743
* Isar/Provers: Simplifier and Classical methods now support all kind
wenzelm@10003
   744
of modifiers used in the past, including 'cong', 'iff', etc.
wenzelm@10003
   745
wenzelm@10003
   746
* Isar/Provers: added 'fastsimp' and 'clarsimp' methods (combination
wenzelm@10003
   747
of Simplifier and Classical reasoner);
wenzelm@10003
   748
wenzelm@10003
   749
* Isar/HOL: new proof method 'cases' and improved version of 'induct'
wenzelm@10003
   750
now support named cases; major packages (inductive, datatype, primrec,
wenzelm@10003
   751
recdef) support case names and properly name parameters;
wenzelm@9612
   752
wenzelm@10003
   753
* Isar/HOL: new transitivity rules for substitution in inequalities --
wenzelm@10003
   754
monotonicity conditions are extracted to be proven at end of
wenzelm@10003
   755
calculations;
wenzelm@10003
   756
wenzelm@10003
   757
* Isar/HOL: removed 'case_split' thm binding, should use 'cases' proof
wenzelm@10003
   758
method anyway;
wenzelm@10003
   759
wenzelm@10003
   760
* Isar/HOL: removed old expand_if = split_if; theorems if_splits =
wenzelm@10003
   761
split_if split_if_asm; datatype package provides theorems foo.splits =
wenzelm@10003
   762
foo.split foo.split_asm for each datatype;
wenzelm@10003
   763
wenzelm@10003
   764
* Isar/HOL: tuned inductive package, rename "intrs" to "intros"
wenzelm@10003
   765
(potential INCOMPATIBILITY), emulation of mk_cases feature for proof
wenzelm@10003
   766
scripts: new 'inductive_cases' command and 'ind_cases' method; (Note:
wenzelm@10003
   767
use "(cases (simplified))" method in proper proof texts);
wenzelm@10003
   768
wenzelm@10003
   769
* Isar/HOL: added global 'arith_split' attribute for 'arith' method;
wenzelm@10003
   770
wenzelm@10003
   771
* Isar: names of theorems etc. may be natural numbers as well;
wenzelm@10003
   772
wenzelm@10003
   773
* Isar: 'pr' command: optional arguments for goals_limit and
wenzelm@9724
   774
ProofContext.prems_limit; no longer prints theory contexts, but only
wenzelm@9724
   775
proof states;
wenzelm@8487
   776
wenzelm@10003
   777
* Isar: diagnostic commands 'pr', 'thm', 'prop', 'term', 'typ' admit
wenzelm@8518
   778
additional print modes to be specified; e.g. "pr(latex)" will print
wenzelm@8518
   779
proof state according to the Isabelle LaTeX style;
wenzelm@8487
   780
wenzelm@10003
   781
* Isar: improved support for emulating tactic scripts, including proof
wenzelm@9612
   782
methods 'rule_tac' etc., 'cut_tac', 'thin_tac', 'subgoal_tac',
wenzelm@9612
   783
'rename_tac', 'rotate_tac', 'tactic', and 'case_tac' / 'induct_tac'
wenzelm@9612
   784
(for HOL datatypes);
wenzelm@8534
   785
wenzelm@10003
   786
* Isar: simplified (more robust) goal selection of proof methods: 1st
wenzelm@10003
   787
goal, all goals, or explicit goal specifier (tactic emulation); thus
wenzelm@10003
   788
'proof method scripts' have to be in depth-first order;
wenzelm@8673
   789
wenzelm@10003
   790
* Isar: tuned 'let' syntax: replaced 'as' keyword by 'and';
wenzelm@8729
   791
wenzelm@10003
   792
* Isar: removed 'help' command, which hasn't been too helpful anyway;
wenzelm@10003
   793
should instead use individual commands for printing items
wenzelm@10003
   794
(print_commands, print_methods etc.);
wenzelm@9224
   795
wenzelm@10003
   796
* Isar: added 'nothing' --- the empty list of theorems;
wenzelm@9239
   797
wenzelm@8184
   798
paulson@8014
   799
*** HOL ***
paulson@8014
   800
wenzelm@10080
   801
* HOL/MicroJava: formalization of a fragment of Java, together with a
wenzelm@10080
   802
corresponding virtual machine and a specification of its bytecode
wenzelm@10080
   803
verifier and a lightweight bytecode verifier, including proofs of
wenzelm@10080
   804
type-safety; by Gerwin Klein, Tobias Nipkow, David von Oheimb, and
wenzelm@10080
   805
Cornelia Pusch (see also the homepage of project Bali at
wenzelm@10080
   806
http://isabelle.in.tum.de/Bali/);
wenzelm@10080
   807
wenzelm@8518
   808
* HOL/Algebra: new theory of rings and univariate polynomials, by
wenzelm@8518
   809
Clemens Ballarin;
paulson@8014
   810
wenzelm@10157
   811
* HOL/NumberTheory: fundamental Theorem of Arithmetic, Chinese
wenzelm@10003
   812
Remainder Theorem, Fermat/Euler Theorem, Wilson's Theorem, by Thomas M
wenzelm@10003
   813
Rasmussen;
wenzelm@8570
   814
wenzelm@10157
   815
* HOL/Lattice: fundamental concepts of lattice theory and order
wenzelm@10157
   816
structures, including duals, properties of bounds versus algebraic
wenzelm@10157
   817
laws, lattice operations versus set-theoretic ones, the Knaster-Tarski
wenzelm@10157
   818
Theorem for complete lattices etc.; may also serve as a demonstration
wenzelm@10157
   819
for abstract algebraic reasoning using axiomatic type classes, and
wenzelm@10157
   820
mathematics-style proof in Isabelle/Isar; by Markus Wenzel;
wenzelm@10157
   821
wenzelm@10003
   822
* HOL/Prolog: a (bare-bones) implementation of Lambda-Prolog, by David
wenzelm@10003
   823
von Oheimb;
paulson@9542
   824
wenzelm@10164
   825
* HOL/IMPP: extension of IMP with local variables and mutually
wenzelm@10164
   826
recursive procedures, by David von Oheimb;
wenzelm@10164
   827
wenzelm@10003
   828
* HOL/Lambda: converted into new-style theory and document;
paulson@9542
   829
wenzelm@10003
   830
* HOL/ex/Multiquote: example of multiple nested quotations and
wenzelm@10003
   831
anti-quotations -- basically a generalized version of de-Bruijn
wenzelm@10003
   832
representation; very useful in avoiding lifting of operations;
wenzelm@8848
   833
wenzelm@9612
   834
* HOL/record: added general record equality rule to simpset; fixed
wenzelm@9612
   835
select-update simplification procedure to handle extended records as
wenzelm@9612
   836
well; admit "r" as field name;
paulson@9542
   837
paulson@8967
   838
* HOL: 0 is now overloaded over the new sort "zero", allowing its use with
paulson@8967
   839
other numeric types and also as the identity of groups, rings, etc.;
paulson@8967
   840
paulson@8967
   841
* HOL: new axclass plus_ac0 for addition with the AC-laws and 0 as identity.
paulson@8967
   842
Types nat and int belong to this axclass;
paulson@8967
   843
wenzelm@10003
   844
* HOL: greatly improved simplification involving numerals of type nat, int, real:
paulson@8788
   845
   (i + #8 + j) = Suc k simplifies to  #7 + (i + j) = k
paulson@8832
   846
   i*j + k + j*#3*i     simplifies to  #4*(i*j) + k
paulson@8832
   847
  two terms #m*u and #n*u are replaced by #(m+n)*u
paulson@8832
   848
    (where #m, #n and u can implicitly be 1; this is simproc combine_numerals)
paulson@8832
   849
  and the term/formula #m*u+x ~~ #n*u+y simplifies simplifies to #(m-n)+x ~~ y
paulson@8832
   850
    or x ~~ #(n-m)+y, where ~~ is one of = < <= or - (simproc cancel_numerals);
paulson@8736
   851
wenzelm@10003
   852
* HOL: meson_tac is available (previously in ex/meson.ML); it is a
wenzelm@10003
   853
powerful prover for predicate logic but knows nothing of clasets; see
wenzelm@10003
   854
ex/mesontest.ML and ex/mesontest2.ML for example applications;
paulson@9835
   855
wenzelm@8848
   856
* HOL: new version of "case_tac" subsumes both boolean case split and
wenzelm@8440
   857
"exhaust_tac" on datatypes; INCOMPATIBILITY: exhaust_tac no longer
wenzelm@8518
   858
exists, may define val exhaust_tac = case_tac for ad-hoc portability;
wenzelm@8440
   859
wenzelm@8848
   860
* HOL: simplification no longer dives into case-expressions: only the
wenzelm@10129
   861
selector expression is simplified, but not the remaining arms; to
wenzelm@10129
   862
enable full simplification of case-expressions for datatype t, you may
wenzelm@10129
   863
remove t.weak_case_cong from the simpset, either globally (Delcongs
wenzelm@10129
   864
[thm"t.weak_case_cong"];) or locally (delcongs [...]).
nipkow@8603
   865
wenzelm@8848
   866
* HOL/recdef: the recursion equations generated by 'recdef' for
wenzelm@8848
   867
function 'f' are now called f.simps instead of f.rules; if all
wenzelm@8848
   868
termination conditions are proved automatically, these simplification
wenzelm@8848
   869
rules are added to the simpset, as in primrec; rules may be named
wenzelm@8848
   870
individually as well, resulting in a separate list of theorems for
wenzelm@8848
   871
each equation;
wenzelm@8848
   872
wenzelm@9489
   873
* HOL/While is a new theory that provides a while-combinator. It
wenzelm@9489
   874
permits the definition of tail-recursive functions without the
wenzelm@9489
   875
provision of a termination measure. The latter is necessary once the
wenzelm@9489
   876
invariant proof rule for while is applied.
nipkow@9457
   877
wenzelm@10003
   878
* HOL: new (overloaded) notation for the set of elements below/above
wenzelm@10003
   879
some element: {..u}, {..u(}, {l..}, {)l..}. See theory SetInterval.
nipkow@8925
   880
wenzelm@8848
   881
* HOL: theorems impI, allI, ballI bound as "strip";
wenzelm@8848
   882
wenzelm@10003
   883
* HOL: new tactic induct_thm_tac: thm -> string -> int -> tactic
nipkow@9746
   884
induct_tac th "x1 ... xn" expects th to have a conclusion of the form
nipkow@9746
   885
P v1 ... vn and abbreviates res_inst_tac [("v1","x1"),...,("vn","xn")] th;
nipkow@9746
   886
wenzelm@10003
   887
* HOL/Real: "rabs" replaced by overloaded "abs" function;
nipkow@9737
   888
wenzelm@10003
   889
* HOL: theory Sexp now in HOL/Induct examples (it used to be part of
wenzelm@10003
   890
main HOL, but was unused);
nipkow@8626
   891
wenzelm@10003
   892
* HOL: fewer consts declared as global (e.g. have to refer to
wenzelm@10003
   893
"Lfp.lfp" instead of "lfp" internally; affects ML packages only);
wenzelm@8887
   894
wenzelm@10003
   895
* HOL: tuned AST representation of nested pairs, avoiding bogus output
wenzelm@10003
   896
in case of overlap with user translations (e.g. judgements over
wenzelm@10003
   897
tuples); (note that the underlying logical represenation is still
wenzelm@10003
   898
bogus);
wenzelm@9349
   899
nipkow@8412
   900
paulson@9542
   901
*** ZF ***
paulson@9542
   902
wenzelm@10003
   903
* ZF: simplification automatically cancels common terms in arithmetic
wenzelm@10003
   904
expressions over nat and int;
paulson@9542
   905
wenzelm@10003
   906
* ZF: new treatment of nat to minimize type-checking: all operators
wenzelm@10003
   907
coerce their operands to a natural number using the function natify,
wenzelm@10003
   908
making the algebraic laws unconditional;
paulson@9542
   909
wenzelm@10003
   910
* ZF: as above, for int: operators coerce their operands to an integer
wenzelm@10003
   911
using the function intify;
paulson@9542
   912
wenzelm@10003
   913
* ZF: the integer library now contains many of the usual laws for the
wenzelm@10003
   914
orderings, including $<=, and monotonicity laws for $+ and $*;
paulson@9542
   915
wenzelm@10003
   916
* ZF: new example ZF/ex/NatSum to demonstrate integer arithmetic
wenzelm@10003
   917
simplification;
paulson@9388
   918
wenzelm@10003
   919
* FOL and ZF: AddIffs now available, giving theorems of the form P<->Q
wenzelm@10003
   920
to the simplifier and classical reasoner simultaneously;
paulson@9388
   921
paulson@9388
   922
wenzelm@8358
   923
*** General ***
wenzelm@8358
   924
wenzelm@10003
   925
* Provers: blast_tac now handles actual object-logic rules as
wenzelm@10003
   926
assumptions; note that auto_tac uses blast_tac internally as well;
wenzelm@10003
   927
wenzelm@10003
   928
* Provers: new functions rulify/rulify_no_asm: thm -> thm for turning
wenzelm@10003
   929
outer -->/All/Ball into ==>/!!; qed_spec_mp now uses rulify_no_asm;
wenzelm@10003
   930
wenzelm@9941
   931
* Provers: delrules now handles destruct rules as well (no longer need
wenzelm@9941
   932
explicit make_elim);
wenzelm@9941
   933
wenzelm@10003
   934
* Provers: Blast_tac now warns of and ignores "weak elimination rules" e.g.
wenzelm@10003
   935
  [| inj ?f;          ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
wenzelm@10003
   936
use instead the strong form,
wenzelm@10003
   937
  [| inj ?f; ~ ?W ==> ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
wenzelm@10003
   938
in HOL, FOL and ZF the function cla_make_elim will create such rules
wenzelm@10003
   939
from destruct-rules;
wenzelm@9489
   940
wenzelm@9709
   941
* Provers: Simplifier.easy_setup provides a fast path to basic
wenzelm@9709
   942
Simplifier setup for new object-logics;
wenzelm@9709
   943
wenzelm@9709
   944
* Pure: AST translation rules no longer require constant head on LHS;
wenzelm@9349
   945
wenzelm@9709
   946
* Pure: improved name spaces: ambiguous output is qualified; support
wenzelm@9709
   947
for hiding of names;
wenzelm@8729
   948
wenzelm@10003
   949
* system: smart setup of canonical ML_HOME, ISABELLE_INTERFACE, and
wenzelm@10003
   950
XSYMBOL_HOME; no longer need to do manual configuration in most
wenzelm@10003
   951
situations;
wenzelm@10003
   952
wenzelm@9709
   953
* system: compression of ML heaps images may now be controlled via -c
wenzelm@9709
   954
option of isabelle and isatool usedir (currently only observed by
wenzelm@9709
   955
Poly/ML);
wenzelm@8358
   956
wenzelm@9981
   957
* system: isatool installfonts may handle X-Symbol fonts as well (very
wenzelm@9981
   958
useful for remote X11);
wenzelm@9981
   959
wenzelm@9709
   960
* system: provide TAGS file for Isabelle sources;
wenzelm@9052
   961
wenzelm@9288
   962
* ML: infix 'OF' is a version of 'MRS' with more appropriate argument
wenzelm@9288
   963
order;
wenzelm@9288
   964
wenzelm@8994
   965
* ML: renamed flags Syntax.trace_norm_ast to Syntax.trace_ast; global
wenzelm@8994
   966
timing flag supersedes proof_timing and Toplevel.trace;
wenzelm@8994
   967
wenzelm@10003
   968
* ML: new combinators |>> and |>>> for incremental transformations
wenzelm@10003
   969
with secondary results (e.g. certain theory extensions):
wenzelm@10003
   970
wenzelm@9330
   971
* ML: PureThy.add_defs gets additional argument to indicate potential
wenzelm@9330
   972
overloading (usually false);
wenzelm@9330
   973
wenzelm@10003
   974
* ML: PureThy.add_thms/add_axioms/add_defs now return theorems as
wenzelm@10003
   975
results;
wenzelm@8440
   976
wenzelm@8358
   977
wenzelm@8015
   978
wenzelm@7986
   979
New in Isabelle99 (October 1999)
wenzelm@7986
   980
--------------------------------
oheimb@4649
   981
paulson@5931
   982
*** Overview of INCOMPATIBILITIES (see below for more details) ***
paulson@5931
   983
paulson@6922
   984
* HOL: The THEN and ELSE parts of conditional expressions (if P then x else y)
paulson@6922
   985
are no longer simplified.  (This allows the simplifier to unfold recursive
paulson@6922
   986
functional programs.)  To restore the old behaviour, declare
wenzelm@7215
   987
wenzelm@7215
   988
    Delcongs [if_weak_cong];
paulson@6922
   989
wenzelm@6269
   990
* HOL: Removed the obsolete syntax "Compl A"; use -A for set
wenzelm@6269
   991
complement;
paulson@5931
   992
wenzelm@6269
   993
* HOL: the predicate "inj" is now defined by translation to "inj_on";
paulson@6174
   994
berghofe@7847
   995
* HOL/datatype: mutual_induct_tac no longer exists --
berghofe@7847
   996
  use induct_tac "x_1 ... x_n" instead of mutual_induct_tac ["x_1", ..., "x_n"]
berghofe@7847
   997
wenzelm@6386
   998
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
   999
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
  1000
wenzelm@6269
  1001
* ZF: The con_defs part of an inductive definition may no longer refer
wenzelm@6269
  1002
to constants declared in the same theory;
nipkow@6057
  1003
wenzelm@6269
  1004
* HOL, ZF: the function mk_cases, generated by the inductive
wenzelm@6269
  1005
definition package, has lost an argument.  To simplify its result, it
wenzelm@6269
  1006
uses the default simpset instead of a supplied list of theorems.
paulson@6141
  1007
wenzelm@7215
  1008
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
  1009
nipkow@7619
  1010
* Simplifier: the type of the infix ML functions
wenzelm@8729
  1011
        setSSolver addSSolver setSolver addSolver
nipkow@7619
  1012
is now  simpset * solver -> simpset  where `solver' is a new abstract type
nipkow@7619
  1013
for packaging solvers. A solver is created via
wenzelm@8729
  1014
        mk_solver: string -> (thm list -> int -> tactic) -> solver
nipkow@7619
  1015
where the string argument is only a comment.
nipkow@6057
  1016
wenzelm@7647
  1017
paulson@6069
  1018
*** Proof tools ***
paulson@6069
  1019
wenzelm@6343
  1020
* Provers/Arith/fast_lin_arith.ML contains a functor for creating a
wenzelm@6343
  1021
decision procedure for linear arithmetic. Currently it is used for
wenzelm@7593
  1022
types `nat', `int', and `real' in HOL (see below); it can, should and
wenzelm@7593
  1023
will be instantiated for other types and logics as well.
paulson@6069
  1024
nipkow@7324
  1025
* The simplifier now accepts rewrite rules with flexible heads, eg
nipkow@7324
  1026
     hom ?f ==> ?f(?x+?y) = ?f ?x + ?f ?y
nipkow@7324
  1027
  They are applied like any rule with a non-pattern lhs, i.e. by first-order
nipkow@7324
  1028
  matching.
paulson@6069
  1029
wenzelm@7593
  1030
paulson@6014
  1031
*** General ***
paulson@6014
  1032
wenzelm@7986
  1033
* New Isabelle/Isar subsystem provides an alternative to traditional
wenzelm@7215
  1034
tactical theorem proving; together with the ProofGeneral/isar user
wenzelm@7215
  1035
interface it offers an interactive environment for developing human
wenzelm@7215
  1036
readable proof documents (Isar == Intelligible semi-automated
wenzelm@7886
  1037
reasoning); for further information see isatool doc isar-ref,
wenzelm@7986
  1038
src/HOL/Isar_examples and http://isabelle.in.tum.de/Isar/
wenzelm@7886
  1039
wenzelm@9612
  1040
* improved and simplified presentation of theories: better HTML markup
wenzelm@9612
  1041
(including colors), graph views in several sizes; isatool usedir now
wenzelm@9612
  1042
provides a proper interface for user theories (via -P option); actual
wenzelm@9612
  1043
document preparation based on (PDF)LaTeX is available as well (for
wenzelm@9612
  1044
new-style theories only); see isatool doc system for more information;
wenzelm@7215
  1045
wenzelm@7252
  1046
* native support for Proof General, both for classic Isabelle and
wenzelm@7986
  1047
Isabelle/Isar;
wenzelm@7215
  1048
wenzelm@7791
  1049
* ML function thm_deps visualizes dependencies of theorems and lemmas,
wenzelm@7791
  1050
using the graph browser tool;
wenzelm@7791
  1051
wenzelm@6751
  1052
* Isabelle manuals now also available as PDF;
wenzelm@6751
  1053
wenzelm@6449
  1054
* theory loader rewritten from scratch (may not be fully
wenzelm@6449
  1055
bug-compatible); old loadpath variable has been replaced by show_path,
wenzelm@6671
  1056
add_path, del_path, reset_path functions; new operations such as
wenzelm@7593
  1057
update_thy, touch_thy, remove_thy, use/update_thy_only (see also
wenzelm@7593
  1058
isatool doc ref);
wenzelm@6449
  1059
wenzelm@7215
  1060
* improved isatool install: option -k creates KDE application icon,
wenzelm@7215
  1061
option -p DIR installs standalone binaries;
wenzelm@7215
  1062
wenzelm@7215
  1063
* added ML_PLATFORM setting (useful for cross-platform installations);
wenzelm@7215
  1064
more robust handling of platform specific ML images for SML/NJ;
wenzelm@7215
  1065
wenzelm@7886
  1066
* the settings environment is now statically scoped, i.e. it is never
wenzelm@7986
  1067
created again in sub-processes invoked from isabelle, isatool, or
wenzelm@7886
  1068
Isabelle;
wenzelm@7886
  1069
wenzelm@7215
  1070
* path element specification '~~' refers to '$ISABELLE_HOME';
wenzelm@7215
  1071
wenzelm@6343
  1072
* in locales, the "assumes" and "defines" parts may be omitted if
wenzelm@6343
  1073
empty;
wenzelm@5973
  1074
wenzelm@6269
  1075
* new print_mode "xsymbols" for extended symbol support (e.g. genuine
wenzelm@6269
  1076
long arrows);
wenzelm@6259
  1077
wenzelm@6343
  1078
* new print_mode "HTML";
wenzelm@6343
  1079
wenzelm@6343
  1080
* new flag show_tags controls display of tags of theorems (which are
wenzelm@6343
  1081
basically just comments that may be attached by some tools);
wenzelm@6343
  1082
wenzelm@6461
  1083
* Isamode 2.6 requires patch to accomodate change of Isabelle font
wenzelm@6461
  1084
mode and goal output format:
wenzelm@6461
  1085
wenzelm@6461
  1086
diff -r Isamode-2.6/elisp/isa-load.el Isamode/elisp/isa-load.el
wenzelm@6461
  1087
244c244
wenzelm@6461
  1088
<       (list (isa-getenv "ISABELLE") "-msymbols" logic-name)
wenzelm@6461
  1089
---
wenzelm@6533
  1090
>       (list (isa-getenv "ISABELLE") "-misabelle_font" "-msymbols" logic-name)
wenzelm@6461
  1091
diff -r Isabelle-2.6/elisp/isa-proofstate.el Isamode/elisp/isa-proofstate.el
wenzelm@6461
  1092
181c181
wenzelm@6461
  1093
< (defconst proofstate-proofstart-regexp "^Level [0-9]+$"
wenzelm@6461
  1094
---
wenzelm@6461
  1095
> (defconst proofstate-proofstart-regexp "^Level [0-9]+"
wenzelm@6461
  1096
wenzelm@7450
  1097
* function bind_thms stores lists of theorems (cf. bind_thm);
wenzelm@7450
  1098
wenzelm@7593
  1099
* new shorthand tactics ftac, eatac, datac, fatac;
wenzelm@7593
  1100
wenzelm@7593
  1101
* qed (and friends) now accept "" as result name; in that case the
wenzelm@7986
  1102
theorem is not stored, but proper checks and presentation of the
wenzelm@7986
  1103
result still apply;
wenzelm@7593
  1104
wenzelm@7805
  1105
* theorem database now also indexes constants "Trueprop", "all",
wenzelm@7805
  1106
"==>", "=="; thus thms_containing, findI etc. may retrieve more rules;
wenzelm@7805
  1107
oheimb@6028
  1108
nipkow@6057
  1109
*** HOL ***
nipkow@6057
  1110
wenzelm@7215
  1111
** HOL arithmetic **
wenzelm@7215
  1112
wenzelm@6343
  1113
* There are now decision procedures for linear arithmetic over nat and
wenzelm@6343
  1114
int:
nipkow@6131
  1115
wenzelm@6343
  1116
1. arith_tac copes with arbitrary formulae involving `=', `<', `<=',
wenzelm@6343
  1117
`+', `-', `Suc', `min', `max' and numerical constants; other subterms
wenzelm@6343
  1118
are treated as atomic; subformulae not involving type `nat' or `int'
wenzelm@6343
  1119
are ignored; quantified subformulae are ignored unless they are
wenzelm@6343
  1120
positive universal or negative existential. The tactic has to be
wenzelm@6343
  1121
invoked by hand and can be a little bit slow. In particular, the
wenzelm@6343
  1122
running time is exponential in the number of occurrences of `min' and
wenzelm@6343
  1123
`max', and `-' on `nat'.
nipkow@6131
  1124
wenzelm@6343
  1125
2. fast_arith_tac is a cut-down version of arith_tac: it only takes
wenzelm@6343
  1126
(negated) (in)equalities among the premises and the conclusion into
wenzelm@6343
  1127
account (i.e. no compound formulae) and does not know about `min' and
wenzelm@6343
  1128
`max', and `-' on `nat'. It is fast and is used automatically by the
wenzelm@6343
  1129
simplifier.
nipkow@6131
  1130
wenzelm@6343
  1131
NB: At the moment, these decision procedures do not cope with mixed
wenzelm@6343
  1132
nat/int formulae where the two parts interact, such as `m < n ==>
wenzelm@6343
  1133
int(m) < int(n)'.
oheimb@6028
  1134
wenzelm@7215
  1135
* HOL/Numeral provides a generic theory of numerals (encoded
wenzelm@7313
  1136
efficiently as bit strings); setup for types nat/int/real is in place;
wenzelm@7215
  1137
INCOMPATIBILITY: since numeral syntax is now polymorphic, rather than
wenzelm@7215
  1138
int, existing theories and proof scripts may require a few additional
wenzelm@7215
  1139
type constraints;
wenzelm@7215
  1140
wenzelm@7215
  1141
* integer division and remainder can now be performed on constant
wenzelm@7215
  1142
arguments;
paulson@7157
  1143
wenzelm@7215
  1144
* many properties of integer multiplication, division and remainder
wenzelm@7215
  1145
are now available;
paulson@6922
  1146
paulson@7287
  1147
* An interface to the Stanford Validity Checker (SVC) is available through the
paulson@7287
  1148
tactic svc_tac.  Propositional tautologies and theorems of linear arithmetic
paulson@7287
  1149
are proved automatically.  SVC must be installed separately, and its results
paulson@7287
  1150
must be TAKEN ON TRUST (Isabelle does not check the proofs, but tags any
paulson@7287
  1151
invocation of the underlying oracle).  For SVC see
paulson@7444
  1152
  http://verify.stanford.edu/SVC
paulson@6922
  1153
wenzelm@7125
  1154
* IsaMakefile: the HOL-Real target now builds an actual image;
wenzelm@7125
  1155
wenzelm@7215
  1156
wenzelm@7215
  1157
** HOL misc **
wenzelm@7215
  1158
wenzelm@7595
  1159
* HOL/Real/HahnBanach: the Hahn-Banach theorem for real vector spaces
wenzelm@7595
  1160
(in Isabelle/Isar) -- by Gertrud Bauer;
wenzelm@7595
  1161
wenzelm@7691
  1162
* HOL/BCV: generic model of bytecode verification, i.e. data-flow
wenzelm@7691
  1163
analysis for assembly languages with subtypes;
wenzelm@7691
  1164
wenzelm@6278
  1165
* HOL/TLA (Lamport's Temporal Logic of Actions): major reorganization
wenzelm@6278
  1166
-- avoids syntactic ambiguities and treats state, transition, and
wenzelm@6278
  1167
temporal levels more uniformly; introduces INCOMPATIBILITIES due to
wenzelm@6278
  1168
changed syntax and (many) tactics;
wenzelm@6278
  1169
wenzelm@7791
  1170
* HOL/inductive: Now also handles more general introduction rules such
wenzelm@7791
  1171
  as "ALL y. (y, x) : r --> y : acc r ==> x : acc r"; monotonicity
wenzelm@7791
  1172
  theorems are now maintained within the theory (maintained via the
wenzelm@7791
  1173
  "mono" attribute);
berghofe@7780
  1174
wenzelm@7238
  1175
* HOL/datatype: Now also handles arbitrarily branching datatypes
wenzelm@7238
  1176
  (using function types) such as
wenzelm@7238
  1177
wenzelm@7238
  1178
  datatype 'a tree = Atom 'a | Branch "nat => 'a tree"
berghofe@7047
  1179
wenzelm@7326
  1180
* HOL/record: record_simproc (part of the default simpset) takes care
wenzelm@7326
  1181
of selectors applied to updated records; record_split_tac is no longer
wenzelm@7327
  1182
part of the default claset; update_defs may now be removed from the
wenzelm@7327
  1183
simpset in many cases; COMPATIBILITY: old behavior achieved by
wenzelm@7326
  1184
wenzelm@7326
  1185
  claset_ref () := claset() addSWrapper record_split_wrapper;
wenzelm@7326
  1186
  Delsimprocs [record_simproc]
wenzelm@7326
  1187
wenzelm@6386
  1188
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
  1189
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
  1190
paulson@7287
  1191
* HOL/recdef (TFL): 'congs' syntax now expects comma separated list of theorem
paulson@7287
  1192
names rather than an ML expression;
paulson@7287
  1193
paulson@7287
  1194
* HOL/defer_recdef (TFL): like recdef but the well-founded relation can be
paulson@7287
  1195
supplied later.  Program schemes can be defined, such as
paulson@7287
  1196
    "While B C s = (if B s then While B C (C s) else s)"
paulson@7287
  1197
where the well-founded relation can be chosen after B and C have been given.
wenzelm@6563
  1198
wenzelm@7215
  1199
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
  1200
INCOMPATIBILITY: while [] and infix # syntax is still there, of
wenzelm@7215
  1201
course, ML tools referring to List.list.op # etc. have to be adapted;
wenzelm@7215
  1202
wenzelm@7238
  1203
* HOL_quantifiers flag superseded by "HOL" print mode, which is
wenzelm@7238
  1204
disabled by default; run isabelle with option -m HOL to get back to
wenzelm@7238
  1205
the original Gordon/HOL-style output;
wenzelm@7238
  1206
wenzelm@7238
  1207
* HOL/Ord.thy: new bounded quantifier syntax (input only): ALL x<y. P,
wenzelm@7238
  1208
ALL x<=y. P, EX x<y. P, EX x<=y. P;
wenzelm@7238
  1209
wenzelm@7238
  1210
* HOL basic syntax simplified (more orthogonal): all variants of
wenzelm@7238
  1211
All/Ex now support plain / symbolic / HOL notation; plain syntax for
wenzelm@7238
  1212
Eps operator is provided as well: "SOME x. P[x]";
wenzelm@7238
  1213
berghofe@7320
  1214
* HOL/Sum.thy: sum_case has been moved to HOL/Datatype;
wenzelm@7261
  1215
wenzelm@7280
  1216
* HOL/Univ.thy: infix syntax <*>, <+>, <**>, <+> eliminated and made
wenzelm@7280
  1217
thus available for user theories;
wenzelm@7280
  1218
wenzelm@7300
  1219
* HOLCF/IOA/Sequents: renamed 'Cons' to 'Consq' to avoid clash with
wenzelm@7300
  1220
HOL/List; hardly an INCOMPATIBILITY since '>>' syntax is used all the
wenzelm@7300
  1221
time;
wenzelm@7300
  1222
wenzelm@7986
  1223
* HOL: new tactic smp_tac: int -> int -> tactic, which applies spec
wenzelm@7986
  1224
several times and then mp;
oheimb@7492
  1225
wenzelm@7215
  1226
paulson@7113
  1227
*** LK ***
paulson@7113
  1228
wenzelm@7215
  1229
* the notation <<...>> is now available as a notation for sequences of
wenzelm@7215
  1230
formulas;
paulson@7113
  1231
paulson@7113
  1232
* the simplifier is now installed
paulson@7113
  1233
wenzelm@8729
  1234
* the axiom system has been generalized (thanks to Soren Heilmann)
paulson@7113
  1235
paulson@7113
  1236
* the classical reasoner now has a default rule database
paulson@7113
  1237
paulson@7113
  1238
paulson@6064
  1239
*** ZF ***
paulson@6064
  1240
paulson@6064
  1241
* new primrec section allows primitive recursive functions to be given
wenzelm@6269
  1242
directly (as in HOL) over datatypes and the natural numbers;
paulson@6064
  1243
wenzelm@6269
  1244
* new tactics induct_tac and exhaust_tac for induction (or case
wenzelm@6269
  1245
analysis) over datatypes and the natural numbers;
paulson@6064
  1246
paulson@6064
  1247
* the datatype declaration of type T now defines the recursor T_rec;
paulson@6064
  1248
paulson@6141
  1249
* simplification automatically does freeness reasoning for datatype
wenzelm@6269
  1250
constructors;
paulson@6141
  1251
wenzelm@6269
  1252
* automatic type-inference, with AddTCs command to insert new
wenzelm@6269
  1253
type-checking rules;
paulson@6155
  1254
wenzelm@6269
  1255
* datatype introduction rules are now added as Safe Introduction rules
wenzelm@6269
  1256
to the claset;
paulson@6155
  1257
wenzelm@6269
  1258
* the syntax "if P then x else y" is now available in addition to
wenzelm@6269
  1259
if(P,x,y);
wenzelm@6269
  1260
paulson@6069
  1261
wenzelm@6343
  1262
*** Internal programming interfaces ***
wenzelm@6343
  1263
wenzelm@7919
  1264
* tuned simplifier trace output; new flag debug_simp;
wenzelm@7919
  1265
wenzelm@7420
  1266
* structures Vartab / Termtab (instances of TableFun) offer efficient
wenzelm@7420
  1267
tables indexed by indexname_ord / term_ord (compatible with aconv);
wenzelm@7420
  1268
wenzelm@6386
  1269
* AxClass.axclass_tac lost the theory argument;
wenzelm@6386
  1270
wenzelm@6343
  1271
* tuned current_goals_markers semantics: begin / end goal avoids
wenzelm@6343
  1272
printing empty lines;
wenzelm@6343
  1273
wenzelm@6343
  1274
* removed prs and prs_fn hook, which was broken because it did not
wenzelm@6343
  1275
include \n in its semantics, forcing writeln to add one
wenzelm@6343
  1276
uncoditionally; replaced prs_fn by writeln_fn; consider std_output:
wenzelm@6343
  1277
string -> unit if you really want to output text without newline;
wenzelm@6343
  1278
wenzelm@6343
  1279
* Symbol.output subject to print mode; INCOMPATIBILITY: defaults to
wenzelm@6343
  1280
plain output, interface builders may have to enable 'isabelle_font'
wenzelm@6343
  1281
mode to get Isabelle font glyphs as before;
wenzelm@6343
  1282
wenzelm@6343
  1283
* refined token_translation interface; INCOMPATIBILITY: output length
wenzelm@6343
  1284
now of type real instead of int;
wenzelm@6343
  1285
wenzelm@7196
  1286
* theory loader actions may be traced via new ThyInfo.add_hook
wenzelm@7196
  1287
interface (see src/Pure/Thy/thy_info.ML); example application: keep
wenzelm@7196
  1288
your own database of information attached to *whole* theories -- as
wenzelm@7196
  1289
opposed to intra-theory data slots offered via TheoryDataFun;
wenzelm@7196
  1290
wenzelm@7647
  1291
* proper handling of dangling sort hypotheses (at last!);
wenzelm@7647
  1292
Thm.strip_shyps and Drule.strip_shyps_warning take care of removing
wenzelm@7647
  1293
extra sort hypotheses that can be witnessed from the type signature;
wenzelm@7986
  1294
the force_strip_shyps flag is gone, any remaining shyps are simply
wenzelm@7986
  1295
left in the theorem (with a warning issued by strip_shyps_warning);
wenzelm@7647
  1296
wenzelm@6343
  1297
paulson@6064
  1298
wenzelm@5781
  1299
New in Isabelle98-1 (October 1998)
wenzelm@5781
  1300
----------------------------------
wenzelm@5781
  1301
wenzelm@5127
  1302
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4842
  1303
wenzelm@5726
  1304
* several changes of automated proof tools;
wenzelm@5373
  1305
wenzelm@5726
  1306
* HOL: major changes to the inductive and datatype packages, including
wenzelm@5726
  1307
some minor incompatibilities of theory syntax;
berghofe@5214
  1308
wenzelm@5726
  1309
* HOL: renamed r^-1 to 'converse' from 'inverse'; 'inj_onto' is now
wenzelm@5217
  1310
called `inj_on';
paulson@5160
  1311
nipkow@5275
  1312
* HOL: removed duplicate thms in Arith:
nipkow@5275
  1313
  less_imp_add_less  should be replaced by  trans_less_add1
nipkow@5275
  1314
  le_imp_add_le      should be replaced by  trans_le_add1
paulson@5160
  1315
wenzelm@5726
  1316
* HOL: unary minus is now overloaded (new type constraints may be
wenzelm@5726
  1317
required);
paulson@5490
  1318
wenzelm@5726
  1319
* HOL and ZF: unary minus for integers is now #- instead of #~.  In
wenzelm@5726
  1320
ZF, expressions such as n#-1 must be changed to n#- 1, since #-1 is
wenzelm@5726
  1321
now taken as an integer constant.
paulson@5541
  1322
wenzelm@5726
  1323
* Pure: ML function 'theory_of' renamed to 'theory';
wenzelm@5397
  1324
wenzelm@5363
  1325
wenzelm@5127
  1326
*** Proof tools ***
nipkow@4880
  1327
nipkow@5657
  1328
* Simplifier:
nipkow@5657
  1329
  1. Asm_full_simp_tac is now more aggressive.
nipkow@5657
  1330
     1. It will sometimes reorient premises if that increases their power to
nipkow@5657
  1331
        simplify.
nipkow@5657
  1332
     2. It does no longer proceed strictly from left to right but may also
nipkow@5657
  1333
        rotate premises to achieve further simplification.
nipkow@5657
  1334
     For compatibility reasons there is now Asm_lr_simp_tac which is like the
nipkow@5657
  1335
     old Asm_full_simp_tac in that it does not rotate premises.
nipkow@5657
  1336
  2. The simplifier now knows a little bit about nat-arithmetic.
nipkow@4880
  1337
wenzelm@5127
  1338
* Classical reasoner: wrapper mechanism for the classical reasoner now
wenzelm@5127
  1339
allows for selected deletion of wrappers, by introduction of names for
wenzelm@5127
  1340
wrapper functionals.  This implies that addbefore, addSbefore,
wenzelm@5127
  1341
addaltern, and addSaltern now take a pair (name, tactic) as argument,
wenzelm@5127
  1342
and that adding two tactics with the same name overwrites the first
wenzelm@5127
  1343
one (emitting a warning).
oheimb@4824
  1344
  type wrapper = (int -> tactic) -> (int -> tactic)
oheimb@4649
  1345
  setWrapper, setSWrapper, compWrapper and compSWrapper are replaced by
oheimb@4824
  1346
  addWrapper, addSWrapper: claset * (string * wrapper) -> claset
oheimb@4824
  1347
  delWrapper, delSWrapper: claset *  string            -> claset
oheimb@4649
  1348
  getWrapper is renamed to appWrappers, getSWrapper to appSWrappers;
oheimb@4649
  1349
wenzelm@5705
  1350
* Classical reasoner: addbefore/addSbefore now have APPEND/ORELSE
wenzelm@5726
  1351
semantics; addbefore now affects only the unsafe part of step_tac
wenzelm@5726
  1352
etc.; this affects addss/auto_tac/force_tac, so EXISTING PROOFS MAY
wenzelm@5726
  1353
FAIL, but proofs should be fixable easily, e.g. by replacing Auto_tac
wenzelm@5726
  1354
by Force_tac;
oheimb@5524
  1355
wenzelm@5726
  1356
* Classical reasoner: setwrapper to setWrapper and compwrapper to
wenzelm@5726
  1357
compWrapper; added safe wrapper (and access functions for it);
oheimb@5524
  1358
wenzelm@5127
  1359
* HOL/split_all_tac is now much faster and fails if there is nothing
wenzelm@5726
  1360
to split.  Some EXISTING PROOFS MAY REQUIRE ADAPTION because the order
wenzelm@5726
  1361
and the names of the automatically generated variables have changed.
wenzelm@5726
  1362
split_all_tac has moved within claset() from unsafe wrappers to safe
wenzelm@5726
  1363
wrappers, which means that !!-bound variables are split much more
wenzelm@5726
  1364
aggressively, and safe_tac and clarify_tac now split such variables.
wenzelm@5726
  1365
If this splitting is not appropriate, use delSWrapper "split_all_tac".
wenzelm@5726
  1366
Note: the same holds for record_split_tac, which does the job of
wenzelm@5726
  1367
split_all_tac for record fields.
wenzelm@5127
  1368
wenzelm@5726
  1369
* HOL/Simplifier: Rewrite rules for case distinctions can now be added
wenzelm@5726
  1370
permanently to the default simpset using Addsplits just like
wenzelm@5726
  1371
Addsimps. They can be removed via Delsplits just like
wenzelm@5726
  1372
Delsimps. Lower-case versions are also available.
wenzelm@5127
  1373
wenzelm@5726
  1374
* HOL/Simplifier: The rule split_if is now part of the default
wenzelm@5726
  1375
simpset. This means that the simplifier will eliminate all occurrences
wenzelm@5726
  1376
of if-then-else in the conclusion of a goal. To prevent this, you can
wenzelm@5726
  1377
either remove split_if completely from the default simpset by
wenzelm@5726
  1378
`Delsplits [split_if]' or remove it in a specific call of the
wenzelm@5726
  1379
simplifier using `... delsplits [split_if]'.  You can also add/delete
wenzelm@5726
  1380
other case splitting rules to/from the default simpset: every datatype
wenzelm@5726
  1381
generates suitable rules `split_t_case' and `split_t_case_asm' (where
wenzelm@5726
  1382
t is the name of the datatype).
wenzelm@5127
  1383
wenzelm@5726
  1384
* Classical reasoner / Simplifier combination: new force_tac (and
wenzelm@5127
  1385
derivatives Force_tac, force) combines rewriting and classical
wenzelm@5127
  1386
reasoning (and whatever other tools) similarly to auto_tac, but is
wenzelm@5726
  1387
aimed to solve the given subgoal completely.
wenzelm@5127
  1388
wenzelm@5127
  1389
wenzelm@5127
  1390
*** General ***
wenzelm@5127
  1391
wenzelm@5217
  1392
* new top-level commands `Goal' and `Goalw' that improve upon `goal'
wenzelm@5127
  1393
and `goalw': the theory is no longer needed as an explicit argument -
wenzelm@5127
  1394
the current theory context is used; assumptions are no longer returned
wenzelm@5127
  1395
at the ML-level unless one of them starts with ==> or !!; it is
wenzelm@5217
  1396
recommended to convert to these new commands using isatool fixgoal
wenzelm@5217
  1397
(backup your sources first!);
wenzelm@4842
  1398
wenzelm@5217
  1399
* new top-level commands 'thm' and 'thms' for retrieving theorems from
wenzelm@5207
  1400
the current theory context, and 'theory' to lookup stored theories;
paulson@4806
  1401
paulson@5722
  1402
* new theory section 'locale' for declaring constants, assumptions and
paulson@5722
  1403
definitions that have local scope;
paulson@5722
  1404
wenzelm@5127
  1405
* new theory section 'nonterminals' for purely syntactic types;
wenzelm@4858
  1406
wenzelm@5127
  1407
* new theory section 'setup' for generic ML setup functions
wenzelm@5127
  1408
(e.g. package initialization);
wenzelm@4869
  1409
wenzelm@5131
  1410
* the distribution now includes Isabelle icons: see
wenzelm@5131
  1411
lib/logo/isabelle-{small,tiny}.xpm;
wenzelm@5131
  1412
wenzelm@5363
  1413
* isatool install - install binaries with absolute references to
wenzelm@5363
  1414
ISABELLE_HOME/bin;
wenzelm@5363
  1415
wenzelm@5572
  1416
* isatool logo -- create instances of the Isabelle logo (as EPS);
wenzelm@5572
  1417
wenzelm@5407
  1418
* print mode 'emacs' reserved for Isamode;
wenzelm@5407
  1419
wenzelm@5726
  1420
* support multiple print (ast) translations per constant name;
wenzelm@5726
  1421
wenzelm@6925
  1422
* theorems involving oracles are now printed with a suffixed [!];
wenzelm@6925
  1423
wenzelm@4711
  1424
paulson@4661
  1425
*** HOL ***
paulson@4661
  1426
wenzelm@5710
  1427
* there is now a tutorial on Isabelle/HOL (do 'isatool doc tutorial');
nipkow@5709
  1428
wenzelm@5217
  1429
* HOL/inductive package reorganized and improved: now supports mutual
paulson@5267
  1430
definitions such as
wenzelm@5217
  1431
wenzelm@5217
  1432
  inductive EVEN ODD
wenzelm@5217
  1433
    intrs
wenzelm@5217
  1434
      null "0 : EVEN"
wenzelm@5217
  1435
      oddI "n : EVEN ==> Suc n : ODD"
wenzelm@5217
  1436
      evenI "n : ODD ==> Suc n : EVEN"
wenzelm@5217
  1437
wenzelm@5217
  1438
new theorem list "elims" contains an elimination rule for each of the
wenzelm@5217
  1439
recursive sets; inductive definitions now handle disjunctive premises
wenzelm@5217
  1440
correctly (also ZF);
berghofe@5214
  1441
wenzelm@5217
  1442
INCOMPATIBILITIES: requires Inductive as an ancestor; component
wenzelm@5217
  1443
"mutual_induct" no longer exists - the induction rule is always
wenzelm@5217
  1444
contained in "induct";
wenzelm@5217
  1445
wenzelm@5217
  1446
wenzelm@5217
  1447
* HOL/datatype package re-implemented and greatly improved: now
paulson@5267
  1448
supports mutually recursive datatypes such as
wenzelm@5217
  1449
wenzelm@5217
  1450
  datatype
wenzelm@5217
  1451
    'a aexp = IF_THEN_ELSE ('a bexp) ('a aexp) ('a aexp)
wenzelm@5217
  1452
            | SUM ('a aexp) ('a aexp)
wenzelm@5217
  1453
            | DIFF ('a aexp) ('a aexp)
wenzelm@5217
  1454
            | NUM 'a
wenzelm@5217
  1455
  and
wenzelm@5217
  1456
    'a bexp = LESS ('a aexp) ('a aexp)
wenzelm@5217
  1457
            | AND ('a bexp) ('a bexp)
wenzelm@5217
  1458
            | OR ('a bexp) ('a bexp)
wenzelm@5217
  1459
paulson@5267
  1460
as well as indirectly recursive datatypes such as
berghofe@5214
  1461
wenzelm@5217
  1462
  datatype
wenzelm@5217
  1463
    ('a, 'b) term = Var 'a
wenzelm@5217
  1464
                  | App 'b ((('a, 'b) term) list)
berghofe@5214
  1465
wenzelm@5217
  1466
The new tactic  mutual_induct_tac [<var_1>, ..., <var_n>] i  performs
wenzelm@5217
  1467
induction on mutually / indirectly recursive datatypes.
wenzelm@5217
  1468
wenzelm@5217
  1469
Primrec equations are now stored in theory and can be accessed via
wenzelm@5217
  1470
<function_name>.simps.
wenzelm@5217
  1471
wenzelm@5217
  1472
INCOMPATIBILITIES:
berghofe@5214
  1473
wenzelm@5217
  1474
  - Theories using datatypes must now have theory Datatype as an
wenzelm@5217
  1475
    ancestor.
wenzelm@5217
  1476
  - The specific <typename>.induct_tac no longer exists - use the
wenzelm@5217
  1477
    generic induct_tac instead.
berghofe@5226
  1478
  - natE has been renamed to nat.exhaust - use exhaust_tac
wenzelm@5217
  1479
    instead of res_inst_tac ... natE. Note that the variable
berghofe@5226
  1480
    names in nat.exhaust differ from the names in natE, this
wenzelm@5217
  1481
    may cause some "fragile" proofs to fail.
wenzelm@5217
  1482
  - The theorems split_<typename>_case and split_<typename>_case_asm
wenzelm@5217
  1483
    have been renamed to <typename>.split and <typename>.split_asm.
wenzelm@5217
  1484
  - Since default sorts of type variables are now handled correctly,
wenzelm@5217
  1485
    some datatype definitions may have to be annotated with explicit
wenzelm@5217
  1486
    sort constraints.
wenzelm@5217
  1487
  - Primrec definitions no longer require function name and type
wenzelm@5217
  1488
    of recursive argument.
berghofe@5214
  1489
wenzelm@5217
  1490
Consider using isatool fixdatatype to adapt your theories and proof
wenzelm@5217
  1491
scripts to the new package (backup your sources first!).
wenzelm@5217
  1492
wenzelm@5217
  1493
wenzelm@5726
  1494
* HOL/record package: considerably improved implementation; now
wenzelm@5726
  1495
includes concrete syntax for record types, terms, updates; theorems
wenzelm@5726
  1496
for surjective pairing and splitting !!-bound record variables; proof
wenzelm@5726
  1497
support is as follows:
wenzelm@5726
  1498
wenzelm@5726
  1499
  1) standard conversions (selectors or updates applied to record
wenzelm@5726
  1500
constructor terms) are part of the standard simpset;
wenzelm@5726
  1501
wenzelm@5726
  1502
  2) inject equations of the form ((x, y) = (x', y')) == x=x' & y=y' are
wenzelm@5726
  1503
made part of standard simpset and claset via addIffs;
wenzelm@5726
  1504
wenzelm@5726
  1505
  3) a tactic for record field splitting (record_split_tac) is part of
wenzelm@5726
  1506
the standard claset (addSWrapper);
wenzelm@5726
  1507
wenzelm@5726
  1508
To get a better idea about these rules you may retrieve them via
wenzelm@5726
  1509
something like 'thms "foo.simps"' or 'thms "foo.iffs"', where "foo" is
wenzelm@5726
  1510
the name of your record type.
wenzelm@5726
  1511
wenzelm@5726
  1512
The split tactic 3) conceptually simplifies by the following rule:
wenzelm@5726
  1513
wenzelm@5726
  1514
  "(!!x. PROP ?P x) == (!!a b. PROP ?P (a, b))"
wenzelm@5726
  1515
wenzelm@5726
  1516
Thus any record variable that is bound by meta-all will automatically
wenzelm@5726
  1517
blow up into some record constructor term, consequently the
wenzelm@5726
  1518
simplifications of 1), 2) apply.  Thus force_tac, auto_tac etc. shall
wenzelm@5726
  1519
solve record problems automatically.
wenzelm@5726
  1520
berghofe@5214
  1521
wenzelm@5125
  1522
* reorganized the main HOL image: HOL/Integ and String loaded by
wenzelm@5125
  1523
default; theory Main includes everything;
wenzelm@5125
  1524
paulson@5650
  1525
* automatic simplification of integer sums and comparisons, using cancellation;
paulson@5650
  1526
oheimb@5526
  1527
* added option_map_eq_Some and not_Some_eq to the default simpset and claset;
wenzelm@5127
  1528
wenzelm@5127
  1529
* added disj_not1 = "(~P | Q) = (P --> Q)" to the default simpset;
wenzelm@5127
  1530
wenzelm@5127
  1531
* many new identities for unions, intersections, set difference, etc.;
wenzelm@5127
  1532
wenzelm@5127
  1533
* expand_if, expand_split, expand_sum_case and expand_nat_case are now
wenzelm@5127
  1534
called split_if, split_split, split_sum_case and split_nat_case (to go
wenzelm@5127
  1535
with add/delsplits);
wenzelm@5125
  1536
wenzelm@5127
  1537
* HOL/Prod introduces simplification procedure unit_eq_proc rewriting
wenzelm@5127
  1538
(?x::unit) = (); this is made part of the default simpset, which COULD
wenzelm@5127
  1539
MAKE EXISTING PROOFS FAIL under rare circumstances (consider
wenzelm@5207
  1540
'Delsimprocs [unit_eq_proc];' as last resort); also note that
wenzelm@5207
  1541
unit_abs_eta_conv is added in order to counter the effect of
wenzelm@5207
  1542
unit_eq_proc on (%u::unit. f u), replacing it by f rather than by
wenzelm@5207
  1543
%u.f();
wenzelm@5125
  1544
wenzelm@5217
  1545
* HOL/Fun INCOMPATIBILITY: `inj_onto' is now called `inj_on' (which
wenzelm@5217
  1546
makes more sense);
berghofe@5109
  1547
paulson@5475
  1548
* HOL/Set INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
  1549
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
  1550
  disjointness reasoning but breaking a few old proofs.
paulson@5267
  1551
wenzelm@5217
  1552
* HOL/Relation INCOMPATIBILITY: renamed the relational operator r^-1
wenzelm@5217
  1553
to 'converse' from 'inverse' (for compatibility with ZF and some
wenzelm@5217
  1554
literature);
wenzelm@5085
  1555
wenzelm@5127
  1556
* HOL/recdef can now declare non-recursive functions, with {} supplied as
wenzelm@5127
  1557
the well-founded relation;
oheimb@4838
  1558
paulson@5490
  1559
* HOL/Set INCOMPATIBILITY: the complement of set A is now written -A instead of
paulson@5490
  1560
    Compl A.  The "Compl" syntax remains available as input syntax for this
paulson@5490
  1561
    release ONLY.
paulson@5490
  1562
wenzelm@5127
  1563
* HOL/Update: new theory of function updates:
wenzelm@5127
  1564
    f(a:=b) == %x. if x=a then b else f x
wenzelm@5127
  1565
may also be iterated as in f(a:=b,c:=d,...);
nipkow@5077
  1566
wenzelm@5127
  1567
* HOL/Vimage: new theory for inverse image of a function, syntax f-``B;
paulson@4899
  1568
nipkow@5282
  1569
* HOL/List:
nipkow@5282
  1570
  - new function list_update written xs[i:=v] that updates the i-th
nipkow@5282
  1571
    list position. May also be iterated as in xs[i:=a,j:=b,...].
nipkow@5428
  1572
  - new function `upt' written [i..j(] which generates the list
nipkow@5428
  1573
    [i,i+1,...,j-1], i.e. the upper bound is excluded. To include the upper
nipkow@5428
  1574
    bound write [i..j], which is a shorthand for [i..j+1(].
nipkow@5282
  1575
  - new lexicographic orderings and corresponding wellfoundedness theorems.
paulson@4779
  1576
wenzelm@5127
  1577
* HOL/Arith:
wenzelm@5127
  1578
  - removed 'pred' (predecessor) function;
wenzelm@5127
  1579
  - generalized some theorems about n-1;
wenzelm@5127
  1580
  - many new laws about "div" and "mod";
wenzelm@5127
  1581
  - new laws about greatest common divisors (see theory ex/Primes);
oheimb@4766
  1582
wenzelm@5127
  1583
* HOL/Relation: renamed the relational operator r^-1 "converse"
wenzelm@4842
  1584
instead of "inverse";
wenzelm@4711
  1585
nipkow@5651
  1586
* HOL/Induct/Multiset: a theory of multisets, including the wellfoundedness
nipkow@5651
  1587
  of the multiset ordering;
nipkow@5651
  1588
wenzelm@5127
  1589
* directory HOL/Real: a construction of the reals using Dedekind cuts
nipkow@5651
  1590
  (not included by default);
nipkow@4835
  1591
wenzelm@5127
  1592
* directory HOL/UNITY: Chandy and Misra's UNITY formalism;
wenzelm@4711
  1593
nipkow@5651
  1594
* directory HOL/Hoare: a new version of Hoare logic which permits many-sorted
nipkow@5651
  1595
  programs, i.e. different program variables may have different types.
nipkow@5651
  1596
paulson@5142
  1597
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
  1598
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
  1599
  Now rew can involve either definitions or equalities (either == or =).
wenzelm@5002
  1600
wenzelm@5363
  1601
paulson@4879
  1602
*** ZF ***
paulson@4879
  1603
paulson@5332
  1604
* theory Main includes everything; INCOMPATIBILITY: theory ZF.thy contains
paulson@5332
  1605
  only the theorems proved on ZF.ML;
paulson@5160
  1606
paulson@5475
  1607
* ZF INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
  1608
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
  1609
  disjointness reasoning but breaking a few old proofs.
paulson@5267
  1610
paulson@5160
  1611
* ZF/Update: new theory of function updates
paulson@5160
  1612
    with default rewrite rule  f(x:=y) ` z = if(z=x, y, f`z)
paulson@5160
  1613
  may also be iterated as in f(a:=b,c:=d,...);
paulson@5160
  1614
paulson@4879
  1615
* in  let x=t in u(x), neither t nor u(x) has to be an FOL term.
oheimb@4649
  1616
paulson@5142
  1617
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
  1618
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
  1619
  Now rew can involve either definitions or equalities (either == or =).
paulson@5142
  1620
paulson@5160
  1621
* case_tac provided for compatibility with HOL
paulson@5160
  1622
    (like the old excluded_middle_tac, but with subgoals swapped)
paulson@5160
  1623
wenzelm@4842
  1624
wenzelm@5127
  1625
*** Internal programming interfaces ***
wenzelm@5002
  1626
wenzelm@5251
  1627
* Pure: several new basic modules made available for general use, see
wenzelm@5251
  1628
also src/Pure/README;
wenzelm@5207
  1629
wenzelm@5008
  1630
* improved the theory data mechanism to support encapsulation (data
wenzelm@5008
  1631
kind name replaced by private Object.kind, acting as authorization
wenzelm@5373
  1632
key); new type-safe user interface via functor TheoryDataFun; generic
wenzelm@5373
  1633
print_data function becomes basically useless;
wenzelm@5002
  1634
wenzelm@5251
  1635
* removed global_names compatibility flag -- all theory declarations
wenzelm@5251
  1636
are qualified by default;
wenzelm@5251
  1637
wenzelm@5085
  1638
* module Pure/Syntax now offers quote / antiquote translation
wenzelm@5085
  1639
functions (useful for Hoare logic etc. with implicit dependencies);
wenzelm@5373
  1640
see HOL/ex/Antiquote for an example use;
wenzelm@5085
  1641
wenzelm@5127
  1642
* Simplifier now offers conversions (asm_)(full_)rewrite: simpset ->
wenzelm@5127
  1643
cterm -> thm;
wenzelm@5127
  1644
wenzelm@5207
  1645
* new tactical CHANGED_GOAL for checking that a tactic modifies a
wenzelm@5207
  1646
subgoal;
paulson@5142
  1647
wenzelm@5251
  1648
* Display.print_goals function moved to Locale.print_goals;
wenzelm@5251
  1649
wenzelm@5731
  1650
* standard print function for goals supports current_goals_markers
wenzelm@5731
  1651
variable for marking begin of proof, end of proof, start of goal; the
wenzelm@5731
  1652
default is ("", "", ""); setting current_goals_markers := ("<proof>",
wenzelm@5731
  1653
"</proof>", "<goal>") causes SGML like tagged proof state printing,
wenzelm@5731
  1654
for example;
wenzelm@5731
  1655
wenzelm@5002
  1656
wenzelm@5002
  1657
wenzelm@4410
  1658
New in Isabelle98 (January 1998)
wenzelm@4410
  1659
--------------------------------
wenzelm@4410
  1660
wenzelm@4410
  1661
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4410
  1662
wenzelm@4410
  1663
* changed lexical syntax of terms / types: dots made part of long
wenzelm@4410
  1664
identifiers, e.g. "%x.x" no longer possible, should be "%x. x";
wenzelm@4410
  1665
wenzelm@4410
  1666
* simpset (and claset) reference variable replaced by functions
wenzelm@4410
  1667
simpset / simpset_ref;
wenzelm@4410
  1668
wenzelm@4410
  1669
* no longer supports theory aliases (via merge) and non-trivial
wenzelm@4410
  1670
implicit merge of thms' signatures;
wenzelm@4410
  1671
wenzelm@4410
  1672
* most internal names of constants changed due to qualified names;
wenzelm@4410
  1673
wenzelm@4410
  1674
* changed Pure/Sequence interface (see Pure/seq.ML);
wenzelm@4410
  1675
wenzelm@3454
  1676
paulson@3715
  1677
*** General Changes ***
paulson@3715
  1678
wenzelm@4174
  1679
* hierachically structured name spaces (for consts, types, axms, thms
wenzelm@3943
  1680
etc.); new lexical class 'longid' (e.g. Foo.bar.x) may render much of
wenzelm@4108
  1681
old input syntactically incorrect (e.g. "%x.x"); COMPATIBILITY:
wenzelm@4108
  1682
isatool fixdots ensures space after dots (e.g. "%x. x"); set
wenzelm@4174
  1683
long_names for fully qualified output names; NOTE: ML programs
wenzelm@4174
  1684
(special tactics, packages etc.) referring to internal names may have
wenzelm@4174
  1685
to be adapted to cope with fully qualified names; in case of severe
wenzelm@4174
  1686
backward campatibility problems try setting 'global_names' at compile
wenzelm@4174
  1687
time to have enrything declared within a flat name space; one may also
wenzelm@4174
  1688
fine tune name declarations in theories via the 'global' and 'local'
wenzelm@4174
  1689
section;
wenzelm@4108
  1690
wenzelm@4108
  1691
* reimplemented the implicit simpset and claset using the new anytype
wenzelm@4108
  1692
data filed in signatures; references simpset:simpset ref etc. are
wenzelm@4108
  1693
replaced by functions simpset:unit->simpset and
wenzelm@4108
  1694
simpset_ref:unit->simpset ref; COMPATIBILITY: use isatool fixclasimp
wenzelm@4108
  1695
to patch your ML files accordingly;
paulson@3856
  1696
wenzelm@3857
  1697
* HTML output now includes theory graph data for display with Java
wenzelm@3857
  1698
applet or isatool browser; data generated automatically via isatool
wenzelm@3901
  1699
usedir (see -i option, ISABELLE_USEDIR_OPTIONS);
wenzelm@3857
  1700
paulson@3856
  1701
* defs may now be conditional; improved rewrite_goals_tac to handle
paulson@3856
  1702
conditional equations;
paulson@3856
  1703
wenzelm@4174
  1704
* defs now admits additional type arguments, using TYPE('a) syntax;
wenzelm@4174
  1705
wenzelm@3901
  1706
* theory aliases via merge (e.g. M=A+B+C) no longer supported, always
wenzelm@3901
  1707
creates a new theory node; implicit merge of thms' signatures is
wenzelm@4112
  1708
restricted to 'trivial' ones; COMPATIBILITY: one may have to use
wenzelm@3901
  1709
transfer:theory->thm->thm in (rare) cases;
wenzelm@3901
  1710
wenzelm@3968
  1711
* improved handling of draft signatures / theories; draft thms (and
wenzelm@3968
  1712
ctyps, cterms) are automatically promoted to real ones;
wenzelm@3968
  1713
wenzelm@3901
  1714
* slightly changed interfaces for oracles: admit many per theory, named
wenzelm@3901
  1715
(e.g. oracle foo = mlfun), additional name argument for invoke_oracle;
wenzelm@3901
  1716
wenzelm@3901
  1717
* print_goals: optional output of const types (set show_consts and
wenzelm@3901
  1718
show_types);
wenzelm@3851
  1719
wenzelm@4388
  1720
* improved output of warnings (###) and errors (***);
wenzelm@3697
  1721
paulson@4178
  1722
* subgoal_tac displays a warning if the new subgoal has type variables;
paulson@4178
  1723
paulson@3715
  1724
* removed old README and Makefiles;
wenzelm@3697
  1725
paulson@3856
  1726
* replaced print_goals_ref hook by print_current_goals_fn and result_error_fn;
wenzelm@3670
  1727
paulson@3715
  1728
* removed obsolete init_pps and init_database;
paulson@3715
  1729
paulson@3715
  1730
* deleted the obsolete tactical STATE, which was declared by
paulson@3715
  1731
    fun STATE tacfun st = tacfun st st;
paulson@3715
  1732
wenzelm@4388
  1733
* cd and use now support path variables, e.g. $ISABELLE_HOME, or ~
wenzelm@4388
  1734
(which abbreviates $HOME);
wenzelm@4269
  1735
wenzelm@4269
  1736
* changed Pure/Sequence interface (see Pure/seq.ML); COMPATIBILITY:
wenzelm@4269
  1737
use isatool fixseq to adapt your ML programs (this works for fully
wenzelm@4269
  1738
qualified references to the Sequence structure only!);
wenzelm@4269
  1739
wenzelm@4381
  1740
* use_thy no longer requires writable current directory; it always
wenzelm@4381
  1741
reloads .ML *and* .thy file, if either one is out of date;
wenzelm@4269
  1742
paulson@3715
  1743
paulson@3715
  1744
*** Classical Reasoner ***
paulson@3715
  1745
wenzelm@3744
  1746
* Clarify_tac, clarify_tac, clarify_step_tac, Clarify_step_tac: new
wenzelm@3744
  1747
tactics that use classical reasoning to simplify a subgoal without
wenzelm@3744
  1748
splitting it into several subgoals;
paulson@3715
  1749
paulson@3719
  1750
* Safe_tac: like safe_tac but uses the default claset;
paulson@3719
  1751
paulson@3715
  1752
paulson@3715
  1753
*** Simplifier ***
paulson@3715
  1754
paulson@3715
  1755
* added simplification meta rules:
paulson@3715
  1756
    (asm_)(full_)simplify: simpset -> thm -> thm;
paulson@3715
  1757
paulson@3715
  1758
* simplifier.ML no longer part of Pure -- has to be loaded by object
paulson@3715
  1759
logics (again);
paulson@3715
  1760
paulson@3715
  1761
* added prems argument to simplification procedures;
paulson@3715
  1762
paulson@4325
  1763
* HOL, FOL, ZF: added infix function `addsplits':
paulson@4325
  1764
  instead of `<simpset> setloop (split_tac <thms>)'
paulson@4325
  1765
  you can simply write `<simpset> addsplits <thms>'
paulson@4325
  1766
paulson@3715
  1767
paulson@3715
  1768
*** Syntax ***
paulson@3715
  1769
wenzelm@4174
  1770
* TYPE('a) syntax for type reflection terms;
wenzelm@4174
  1771
wenzelm@3985
  1772
* no longer handles consts with name "" -- declare as 'syntax' instead;
paulson@3856
  1773
paulson@3856
  1774
* pretty printer: changed order of mixfix annotation preference (again!);
wenzelm@3846
  1775
paulson@3715
  1776
* Pure: fixed idt/idts vs. pttrn/pttrns syntactic categories;
paulson@3715
  1777
paulson@3715
  1778
paulson@3715
  1779
*** HOL ***
paulson@3715
  1780
wenzelm@5726
  1781
* HOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  1782
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
  1783
nipkow@4035
  1784
* HOL/TLA: Stephan Merz's formalization of Lamport's Temporal Logic of Actions;
wenzelm@3985
  1785
wenzelm@3985
  1786
* HOL/Auth: new protocol proofs including some for the Internet
nipkow@4035
  1787
  protocol TLS;
wenzelm@3985
  1788
wenzelm@4125
  1789
* HOL/Map: new theory of `maps' a la VDM;
nipkow@3982
  1790
wenzelm@4335
  1791
* HOL/simplifier: simplification procedures nat_cancel_sums for
wenzelm@4335
  1792
cancelling out common nat summands from =, <, <= (in)equalities, or
wenzelm@4335
  1793
differences; simplification procedures nat_cancel_factor for
wenzelm@4335
  1794
cancelling common factor from =, <, <= (in)equalities over natural
wenzelm@4373
  1795
sums; nat_cancel contains both kinds of procedures, it is installed by
wenzelm@4373
  1796
default in Arith.thy -- this COULD MAKE EXISTING PROOFS FAIL;
wenzelm@4335
  1797
nipkow@3580
  1798
* HOL/simplifier: terms of the form
paulson@4325
  1799
  `? x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x)'  (or t=x)
nipkow@3580
  1800
  are rewritten to
nipkow@4035
  1801
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t)',
nipkow@4035
  1802
  and those of the form
paulson@4325
  1803
  `! x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x) --> R(x)'  (or t=x)
nipkow@4035
  1804
  are rewritten to
nipkow@4035
  1805
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t) --> R(t)',
nipkow@4035
  1806
nipkow@4035
  1807
* HOL/datatype
nipkow@4035
  1808
  Each datatype `t' now comes with a theorem `split_t_case' of the form
nipkow@3580
  1809
nipkow@4035
  1810
  P(t_case f1 ... fn x) =
nipkow@4035
  1811
     ( (!y1 ... ym1. x = C1 y1 ... ym1 --> P(f1 y1 ... ym1)) &
nipkow@4035
  1812
        ...
oheimb@4189
  1813
       (!y1 ... ymn. x = Cn y1 ... ymn --> P(f1 y1 ... ymn))
nipkow@4035
  1814
     )
nipkow@4035
  1815
oheimb@4930
  1816
  and a theorem `split_t_case_asm' of the form
oheimb@4189
  1817
oheimb@4189
  1818
  P(t_case f1 ... fn x) =
oheimb@4189
  1819
    ~( (? y1 ... ym1. x = C1 y1 ... ym1 & ~P(f1 y1 ... ym1)) |
oheimb@4189
  1820
        ...
oheimb@4189
  1821
       (? y1 ... ymn. x = Cn y1 ... ymn & ~P(f1 y1 ... ymn))
oheimb@4189
  1822
     )
oheimb@4930
  1823
  which can be added to a simpset via `addsplits'. The existing theorems
oheimb@4930
  1824
  expand_list_case and expand_option_case have been renamed to
oheimb@4930
  1825
  split_list_case and split_option_case.
oheimb@4189
  1826
nipkow@4361
  1827
* HOL/Arithmetic:
nipkow@4361
  1828
  - `pred n' is automatically converted to `n-1'.
nipkow@4361
  1829
    Users are strongly encouraged not to use `pred' any longer,
nipkow@4361
  1830
    because it will disappear altogether at some point.
nipkow@4361
  1831
  - Users are strongly encouraged to write "0 < n" rather than
nipkow@4361
  1832
    "n ~= 0". Theorems and proof tools have been modified towards this
nipkow@4361
  1833
    `standard'.
nipkow@4357
  1834
nipkow@4502
  1835
* HOL/Lists:
nipkow@4502
  1836
  the function "set_of_list" has been renamed "set" (and its theorems too);
nipkow@4502
  1837
  the function "nth" now takes its arguments in the reverse order and
nipkow@4502
  1838
  has acquired the infix notation "!" as in "xs!n".
paulson@3570
  1839
paulson@4154
  1840
* HOL/Set: UNIV is now a constant and is no longer translated to Compl{};
paulson@4154
  1841
paulson@4154
  1842
* HOL/Set: The operator (UN x.B x) now abbreviates (UN x:UNIV. B x) and its
paulson@4154
  1843
  specialist theorems (like UN1_I) are gone.  Similarly for (INT x.B x);
paulson@4154
  1844
wenzelm@4575
  1845
* HOL/record: extensible records with schematic structural subtyping
wenzelm@4575
  1846
(single inheritance); EXPERIMENTAL version demonstrating the encoding,
wenzelm@4575
  1847
still lacks various theorems and concrete record syntax;
wenzelm@4575
  1848
wenzelm@4125
  1849
paulson@3715
  1850
*** HOLCF ***
wenzelm@3535
  1851
wenzelm@4125
  1852
* removed "axioms" and "generated by" sections;
wenzelm@4125
  1853
oheimb@4123
  1854
* replaced "ops" section by extended "consts" section, which is capable of
wenzelm@4125
  1855
  handling the continuous function space "->" directly;
wenzelm@4125
  1856
wenzelm@4125
  1857
* domain package:
wenzelm@4125
  1858
  . proves theorems immediately and stores them in the theory,
wenzelm@4125
  1859
  . creates hierachical name space,
wenzelm@4125
  1860
  . now uses normal mixfix annotations (instead of cinfix...),
wenzelm@4125
  1861
  . minor changes to some names and values (for consistency),
wenzelm@4125
  1862
  . e.g. cases -> casedist, dists_eq -> dist_eqs, [take_lemma] -> take_lemmas,
wenzelm@4125
  1863
  . separator between mutual domain defs: changed "," to "and",
wenzelm@4125
  1864
  . improved handling of sort constraints;  now they have to
wenzelm@4125
  1865
    appear on the left-hand side of the equations only;
oheimb@4123
  1866
oheimb@4123
  1867
* fixed LAM <x,y,zs>.b syntax;
wenzelm@3567
  1868
wenzelm@3744
  1869
* added extended adm_tac to simplifier in HOLCF -- can now discharge
wenzelm@3744
  1870
adm (%x. P (t x)), where P is chainfinite and t continuous;
wenzelm@3579
  1871
wenzelm@3579
  1872
paulson@3719
  1873
*** FOL and ZF ***
paulson@3719
  1874
wenzelm@5726
  1875
* FOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  1876
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
  1877
wenzelm@3744
  1878
* qed_spec_mp, qed_goal_spec_mp, qed_goalw_spec_mp are available, as
wenzelm@3744
  1879
in HOL, they strip ALL and --> from proved theorems;
wenzelm@3744
  1880
paulson@3719
  1881
wenzelm@3579
  1882
wenzelm@3006
  1883
New in Isabelle94-8 (May 1997)
wenzelm@3006
  1884
------------------------------
wenzelm@2654
  1885
paulson@3002
  1886
*** General Changes ***
paulson@3002
  1887
paulson@3002
  1888
* new utilities to build / run / maintain Isabelle etc. (in parts
paulson@3002
  1889
still somewhat experimental); old Makefiles etc. still functional;
wenzelm@2971
  1890
wenzelm@3205
  1891
* new 'Isabelle System Manual';
wenzelm@3205
  1892
wenzelm@2825
  1893
* INSTALL text, together with ./configure and ./build scripts;
wenzelm@2773
  1894
wenzelm@3006
  1895
* reimplemented type inference for greater efficiency, better error
wenzelm@3006
  1896
messages and clean internal interface;
paulson@3002
  1897
paulson@3002
  1898
* prlim command for dealing with lots of subgoals (an easier way of
paulson@3002
  1899
setting goals_limit);
paulson@3002
  1900
wenzelm@3006
  1901
wenzelm@3006
  1902
*** Syntax ***
paulson@3002
  1903
wenzelm@3116
  1904
* supports alternative (named) syntax tables (parser and pretty
wenzelm@3116
  1905
printer); internal interface is provided by add_modesyntax(_i);
wenzelm@3116
  1906
paulson@3002
  1907
* Pure, FOL, ZF, HOL, HOLCF now support symbolic input and output; to
paulson@3002
  1908
be used in conjunction with the Isabelle symbol font; uses the
paulson@3002
  1909
"symbols" syntax table;
paulson@3002
  1910
wenzelm@2705
  1911
* added token_translation interface (may translate name tokens in
wenzelm@2756
  1912
arbitrary ways, dependent on their type (free, bound, tfree, ...) and
wenzelm@3116
  1913
the current print_mode); IMPORTANT: user print translation functions
wenzelm@3116
  1914
are responsible for marking newly introduced bounds
wenzelm@3116
  1915
(Syntax.mark_boundT);
wenzelm@2705
  1916
wenzelm@2730
  1917
* token translations for modes "xterm" and "xterm_color" that display
wenzelm@3006
  1918
names in bold, underline etc. or colors (which requires a color
wenzelm@3006
  1919
version of xterm);
wenzelm@2730
  1920
paulson@3002
  1921
* infixes may now be declared with names independent of their syntax;
paulson@3002
  1922
paulson@3002
  1923
* added typed_print_translation (like print_translation, but may
paulson@3002
  1924
access type of constant);
paulson@3002
  1925
wenzelm@3006
  1926
paulson@3002
  1927
*** Classical Reasoner ***
paulson@3002
  1928
paulson@3002
  1929
Blast_tac: a new tactic!  It is often more powerful than fast_tac, but has
paulson@3002
  1930
some limitations.  Blast_tac...
paulson@3002
  1931
  + ignores addss, addbefore, addafter; this restriction is intrinsic
paulson@3002
  1932
  + ignores elimination rules that don't have the correct format
wenzelm@5726
  1933
        (the conclusion MUST be a formula variable)
paulson@3002
  1934
  + ignores types, which can make HOL proofs fail
paulson@3002
  1935
  + rules must not require higher-order unification, e.g. apply_type in ZF
paulson@3002
  1936
    [message "Function Var's argument not a bound variable" relates to this]
paulson@3002
  1937
  + its proof strategy is more general but can actually be slower
paulson@3002
  1938
wenzelm@3107
  1939
* substitution with equality assumptions no longer permutes other
wenzelm@3107
  1940
assumptions;
paulson@3002
  1941
paulson@3002
  1942
* minor changes in semantics of addafter (now called addaltern); renamed
paulson@3002
  1943
setwrapper to setWrapper and compwrapper to compWrapper; added safe wrapper
wenzelm@3107
  1944
(and access functions for it);
paulson@3002
  1945
wenzelm@5726
  1946
* improved combination of classical reasoner and simplifier:
oheimb@3317
  1947
  + functions for handling clasimpsets
oheimb@3317
  1948
  + improvement of addss: now the simplifier is called _after_ the
oheimb@3317
  1949
    safe steps.
oheimb@3317
  1950
  + safe variant of addss called addSss: uses safe simplifications
wenzelm@5726
  1951
    _during_ the safe steps. It is more complete as it allows multiple
oheimb@3317
  1952
    instantiations of unknowns (e.g. with slow_tac).
wenzelm@3006
  1953
paulson@3002
  1954
*** Simplifier ***
paulson@3002
  1955
wenzelm@3006
  1956
* added interface for simplification procedures (functions that
wenzelm@3006
  1957
produce *proven* rewrite rules on the fly, depending on current
wenzelm@3006
  1958
redex);
wenzelm@3006
  1959
wenzelm@3006
  1960
* ordering on terms as parameter (used for ordered rewriting);
wenzelm@3006
  1961
wenzelm@3107
  1962
* new functions delcongs, deleqcongs, and Delcongs. richer rep_ss;
paulson@3002
  1963
paulson@3002
  1964
* the solver is now split into a safe and an unsafe part.
paulson@3002
  1965
This should be invisible for the normal user, except that the
paulson@3002
  1966
functions setsolver and addsolver have been renamed to setSolver and
wenzelm@3107
  1967
addSolver; added safe_asm_full_simp_tac;
paulson@3002
  1968
paulson@3002
  1969
paulson@3002
  1970
*** HOL ***
paulson@3002
  1971
nipkow@3042
  1972
* a generic induction tactic `induct_tac' which works for all datatypes and
wenzelm@3107
  1973
also for type `nat';
nipkow@3042
  1974
nipkow@3316
  1975
* a generic case distinction tactic `exhaust_tac' which works for all
nipkow@3316
  1976
datatypes and also for type `nat';
nipkow@3316
  1977
nipkow@3316
  1978
* each datatype comes with a function `size';
nipkow@3316
  1979
paulson@3002
  1980
* patterns in case expressions allow tuple patterns as arguments to
wenzelm@3107
  1981
constructors, for example `case x of [] => ... | (x,y,z)#ps => ...';
paulson@3002
  1982
paulson@3002
  1983
* primrec now also works with type nat;
paulson@3002
  1984
paulson@3338
  1985
* recdef: a new declaration form, allows general recursive functions to be
paulson@3338
  1986
defined in theory files.  See HOL/ex/Fib, HOL/ex/Primes, HOL/Subst/Unify.
paulson@3338
  1987
paulson@3002
  1988
* the constant for negation has been renamed from "not" to "Not" to
wenzelm@3107
  1989
harmonize with FOL, ZF, LK, etc.;
paulson@3002
  1990
wenzelm@3107
  1991
* HOL/ex/LFilter theory of a corecursive "filter" functional for
wenzelm@3107
  1992
infinite lists;
paulson@3002
  1993
wenzelm@3227
  1994
* HOL/Modelcheck demonstrates invocation of model checker oracle;
wenzelm@3227
  1995
paulson@3002
  1996
* HOL/ex/Ring.thy declares cring_simp, which solves equational
paulson@3002
  1997
problems in commutative rings, using axiomatic type classes for + and *;
paulson@3002
  1998
paulson@3002
  1999
* more examples in HOL/MiniML and HOL/Auth;
paulson@3002
  2000
paulson@3002
  2001
* more default rewrite rules for quantifiers, union/intersection;
paulson@3002
  2002
nipkow@3321
  2003
* a new constant `arbitrary == @x.False';
nipkow@3321
  2004
wenzelm@3107
  2005
* HOLCF/IOA replaces old HOL/IOA;
wenzelm@3107
  2006
wenzelm@5726
  2007
* HOLCF changes: derived all rules and arities
wenzelm@5726
  2008
  + axiomatic type classes instead of classes
slotosch@2653
  2009
  + typedef instead of faking type definitions
paulson@2747
  2010
  + eliminated the internal constants less_fun, less_cfun, UU_fun, UU_cfun etc.
wenzelm@2730
  2011
  + new axclasses cpo, chfin, flat with flat < chfin < pcpo < cpo < po
slotosch@2653
  2012
  + eliminated the types void, one, tr
slotosch@2653
  2013
  + use unit lift and bool lift (with translations) instead of one and tr
slotosch@2653
  2014
  + eliminated blift from Lift3.thy (use Def instead of blift)
wenzelm@3107
  2015
  all eliminated rules are derived as theorems --> no visible changes ;
oheimb@2649
  2016
wenzelm@3006
  2017
paulson@3002
  2018
*** ZF ***
wenzelm@2553
  2019
paulson@2865
  2020
* ZF now has Fast_tac, Simp_tac and Auto_tac.  Union_iff is a now a default
paulson@2865
  2021
rewrite rule; this may affect some proofs.  eq_cs is gone but can be put back
paulson@2865
  2022
as ZF_cs addSIs [equalityI];
wenzelm@2553
  2023
wenzelm@2554
  2024
wenzelm@2732
  2025
wenzelm@2553
  2026
New in Isabelle94-7 (November 96)
wenzelm@2553
  2027
---------------------------------
wenzelm@2553
  2028
wenzelm@2553
  2029
* allowing negative levels (as offsets) in prlev and choplev;
wenzelm@2553
  2030
wenzelm@2554
  2031
* super-linear speedup for large simplifications;
wenzelm@2554
  2032
wenzelm@2554
  2033
* FOL, ZF and HOL now use miniscoping: rewriting pushes
wenzelm@2554
  2034
quantifications in as far as possible (COULD MAKE EXISTING PROOFS
wenzelm@2554
  2035
FAIL); can suppress it using the command Delsimps (ex_simps @
wenzelm@2554
  2036
all_simps); De Morgan laws are also now included, by default;
wenzelm@2554
  2037
wenzelm@2554
  2038
* improved printing of ==>  :  ~:
wenzelm@2554
  2039
wenzelm@2554
  2040
* new object-logic "Sequents" adds linear logic, while replacing LK
wenzelm@2554
  2041
and Modal (thanks to Sara Kalvala);
wenzelm@2554
  2042
wenzelm@2554
  2043
* HOL/Auth: correctness proofs for authentication protocols;
wenzelm@2554
  2044
wenzelm@2554
  2045
* HOL: new auto_tac combines rewriting and classical reasoning (many
wenzelm@2554
  2046
examples on HOL/Auth);
wenzelm@2554
  2047
wenzelm@2554
  2048
* HOL: new command AddIffs for declaring theorems of the form P=Q to
wenzelm@2554
  2049
the rewriter and classical reasoner simultaneously;
wenzelm@2554
  2050
wenzelm@2554
  2051
* function uresult no longer returns theorems in "standard" format;
wenzelm@2554
  2052
regain previous version by: val uresult = standard o uresult;
wenzelm@2554
  2053
wenzelm@2554
  2054
wenzelm@2554
  2055
wenzelm@2554
  2056
New in Isabelle94-6
wenzelm@2554
  2057
-------------------
wenzelm@2554
  2058
wenzelm@2554
  2059
* oracles -- these establish an interface between Isabelle and trusted
wenzelm@2554
  2060
external reasoners, which may deliver results as theorems;
wenzelm@2554
  2061
wenzelm@2554
  2062
* proof objects (in particular record all uses of oracles);
wenzelm@2554
  2063
wenzelm@2554
  2064
* Simp_tac, Fast_tac, etc. that refer to implicit simpset / claset;
wenzelm@2554
  2065
wenzelm@2554
  2066
* "constdefs" section in theory files;
wenzelm@2554
  2067
wenzelm@2554
  2068
* "primrec" section (HOL) no longer requires names;
wenzelm@2554
  2069
wenzelm@2554
  2070
* internal type "tactic" now simply "thm -> thm Sequence.seq";
wenzelm@2554
  2071
wenzelm@2554
  2072
wenzelm@2554
  2073
wenzelm@2554
  2074
New in Isabelle94-5
wenzelm@2554
  2075
-------------------
wenzelm@2554
  2076
wenzelm@2554
  2077
* reduced space requirements;
wenzelm@2554
  2078
wenzelm@2554
  2079
* automatic HTML generation from theories;
wenzelm@2554
  2080
wenzelm@2554
  2081
* theory files no longer require "..." (quotes) around most types;
wenzelm@2554
  2082
wenzelm@2554
  2083
* new examples, including two proofs of the Church-Rosser theorem;
wenzelm@2554
  2084
wenzelm@2554
  2085
* non-curried (1994) version of HOL is no longer distributed;
wenzelm@2554
  2086
wenzelm@2553
  2087
paulson@2557
  2088
paulson@2557
  2089
New in Isabelle94-4
paulson@2557
  2090
-------------------
paulson@2557
  2091
paulson@2747
  2092
* greatly reduced space requirements;
paulson@2557
  2093
paulson@2557
  2094
* theory files (.thy) no longer require \...\ escapes at line breaks;
paulson@2557
  2095
wenzelm@5726
  2096
* searchable theorem database (see the section "Retrieving theorems" on
paulson@2557
  2097
page 8 of the Reference Manual);
paulson@2557
  2098
paulson@2557
  2099
* new examples, including Grabczewski's monumental case study of the
paulson@2557
  2100
Axiom of Choice;
paulson@2557
  2101
paulson@2557
  2102
* The previous version of HOL renamed to Old_HOL;
paulson@2557
  2103
wenzelm@5726
  2104
* The new version of HOL (previously called CHOL) uses a curried syntax
paulson@2557
  2105
for functions.  Application looks like f a b instead of f(a,b);
paulson@2557
  2106
paulson@2557
  2107
* Mutually recursive inductive definitions finally work in HOL;
paulson@2557
  2108
paulson@2557
  2109
* In ZF, pattern-matching on tuples is now available in all abstractions and
paulson@2557
  2110
translates to the operator "split";
paulson@2557
  2111
paulson@2557
  2112
paulson@2557
  2113
paulson@2557
  2114
New in Isabelle94-3
paulson@2557
  2115
-------------------
paulson@2557
  2116
wenzelm@5726
  2117
* new infix operator, addss, allowing the classical reasoner to
paulson@2557
  2118
perform simplification at each step of its search.  Example:
wenzelm@5726
  2119
        fast_tac (cs addss ss)
paulson@2557
  2120
wenzelm@5726
  2121
* a new logic, CHOL, the same as HOL, but with a curried syntax
wenzelm@5726
  2122
for functions.  Application looks like f a b instead of f(a,b).  Also pairs
paulson@2557
  2123
look like (a,b) instead of <a,b>;
paulson@2557
  2124
paulson@2557
  2125
* PLEASE NOTE: CHOL will eventually replace HOL!
paulson@2557
  2126
paulson@2557
  2127
* In CHOL, pattern-matching on tuples is now available in all abstractions.
paulson@2557
  2128
It translates to the operator "split".  A new theory of integers is available;
paulson@2557
  2129
paulson@2557
  2130
* In ZF, integer numerals now denote two's-complement binary integers.
paulson@2557
  2131
Arithmetic operations can be performed by rewriting.  See ZF/ex/Bin.ML;
paulson@2557
  2132
wenzelm@5726
  2133
* Many new examples: I/O automata, Church-Rosser theorem, equivalents
paulson@2557
  2134
of the Axiom of Choice;
paulson@2557
  2135
paulson@2557
  2136
paulson@2557
  2137
paulson@2557
  2138
New in Isabelle94-2
paulson@2557
  2139
-------------------
paulson@2557
  2140
wenzelm@5726
  2141
* Significantly faster resolution;
paulson@2557
  2142
paulson@2557
  2143
* the different sections in a .thy file can now be mixed and repeated
paulson@2557
  2144
freely;
paulson@2557
  2145
paulson@2557
  2146
* Database of theorems for FOL, HOL and ZF.  New
paulson@2557
  2147
commands including qed, qed_goal and bind_thm store theorems in the database.
paulson@2557
  2148
paulson@2557
  2149
* Simple database queries: return a named theorem (get_thm) or all theorems of
paulson@2557
  2150
a given theory (thms_of), or find out what theory a theorem was proved in
paulson@2557
  2151
(theory_of_thm);
paulson@2557
  2152
paulson@2557
  2153
* Bugs fixed in the inductive definition and datatype packages;
paulson@2557
  2154
paulson@2557
  2155
* The classical reasoner provides deepen_tac and depth_tac, making FOL_dup_cs
paulson@2557
  2156
and HOL_dup_cs obsolete;
paulson@2557
  2157
paulson@2557
  2158
* Syntactic ambiguities caused by the new treatment of syntax in Isabelle94-1
paulson@2557
  2159
have been removed;
paulson@2557
  2160
paulson@2557
  2161
* Simpler definition of function space in ZF;
paulson@2557
  2162
paulson@2557
  2163
* new results about cardinal and ordinal arithmetic in ZF;
paulson@2557
  2164
paulson@2557
  2165
* 'subtype' facility in HOL for introducing new types as subsets of existing
paulson@2557
  2166
types;
paulson@2557
  2167
paulson@2557
  2168
wenzelm@2553
  2169
$Id$