NEWS
author wenzelm
Wed Dec 13 16:21:40 2000 +0100 (2000-12-13)
changeset 10664 da5373fa06de
parent 10634 b4c3af8ebada
child 10726 e12b81140945
permissions -rw-r--r--
* print modes "brackets" and "no_brackets" control output of nested =>
(types) and ==> (props); the default behaviour is "brackets";
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Isabelle NEWS -- history user-relevant changes
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==============================================
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*** Overview of INCOMPATIBILITIES ***
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* HOL/Real: "rinv" and "hrinv" replaced by overloaded "inverse"
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function;
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* HOL: induct renamed to lfp_induct;
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* HOL: contrapos, contrapos2 renamed to contrapos_nn, contrapos_pp;
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* Isar: 'obtain' no longer declares "that" fact as simp/intro;
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* Isar/HOL: method 'induct' now handles non-atomic goals; as a
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consequence, it is no longer monotonic wrt. the local goal context
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(which is now passed through the inductive cases);
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*** Document preparation ***
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* improved isabelle style files; more abstract symbol implementation
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(should now use \isamath{...} and \isatext{...} in custom symbol
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definitions);
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* support sub/super scripts (for single symbols only), input syntax is
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like this: "A\<^sup>*" or "A\<^sup>\<star>";
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* antiquotation @{goals} and @{subgoals} for output of *dynamic* goals
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state; Note that presentation of goal states does not conform to
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actual human-readable proof documents.  Please do not include goal
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states into document output unless you really know what you are doing!
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*** Isar ***
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* Pure: Isar now suffers initial goal statements to contain unbound
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schematic variables (this does not conform to actual readable proof
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documents, due to unpredictable outcome and non-compositional proof
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checking); users who know what they are doing may use schematic goals
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for Prolog-style synthesis of proven results;
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* Pure: assumption method (an implicit finishing) now handles actual
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rules as well;
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* Pure: improved 'obtain' --- moved to Pure, insert "that" into
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initial goal, declare "that" only as Pure intro (only for single
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steps); the "that" rule assumption may now be involved in implicit
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finishing, thus ".." becomes a feasible for trivial obtains;
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* Pure: default proof step now includes 'intro_classes'; thus trivial
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instance proofs may be performed by "..";
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* Pure: ?thesis / ?this / "..." now work for pure meta-level
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statements as well;
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* HOL: improved method 'induct' --- now handles non-atomic goals
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(potential INCOMPATIBILITY); tuned error handling;
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* HOL: cases and induct rules now provide explicit hints about the
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number of facts to be consumed (0 for "type" and 1 for "set" rules);
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any remaining facts are inserted into the goal verbatim;
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*** HOL ***
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* HOL/Library: a collection of generic theories to be used together
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with main HOL; the theory loader path already includes this directory
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by default; the following existing theories have been moved here:
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HOL/Induct/Multiset, HOL/Induct/Acc (as Accessible_Part), HOL/While
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(as While_Combinator), HOL/Lex/Prefix (as List_Prefix);
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* HOL basics: added overloaded operations "inverse" and "divide"
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(infix "/"), syntax for generic "abs" operation;
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* HOL/typedef: simplified package, provide more useful rules (see also
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HOL/subset.thy);
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*** CTT ***
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* CTT: x-symbol support for Pi, Sigma, -->, : (membership); note that
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"lam" is displayed as TWO lambda-symbols
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* CTT: theory Main now available, containing everything (that is, Bool
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and Arith);
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*** General ***
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* print modes "brackets" and "no_brackets" control output of nested =>
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(types) and ==> (props); the default behaviour is "brackets";
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* system: support Poly/ML 4.0 (current beta versions);
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* Pure: the Simplifier has been implemented properly as a derived rule
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outside of the actual kernel (at last!); the overall performance
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penalty in practical applications is about 50%, while reliability of
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the Isabelle inference kernel has been greatly improved;
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* Provers: fast_tac (and friends) now handle actual object-logic rules
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as assumptions as well;
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New in Isabelle99-1 (October 2000)
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----------------------------------
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*** Overview of INCOMPATIBILITIES ***
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* HOL: simplification of natural numbers is much changed; to partly
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recover the old behaviour (e.g. to prevent n+n rewriting to #2*n)
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issue the following ML commands:
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  Delsimprocs Nat_Numeral_Simprocs.cancel_numerals;
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  Delsimprocs [Nat_Numeral_Simprocs.combine_numerals];
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* HOL: simplification no longer dives into case-expressions; this is
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controlled by "t.weak_case_cong" for each datatype t;
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* HOL: nat_less_induct renamed to less_induct;
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* HOL: systematic renaming of the SOME (Eps) rules, may use isatool
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fixsome to patch .thy and .ML sources automatically;
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  select_equality  -> some_equality
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  select_eq_Ex     -> some_eq_ex
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  selectI2EX       -> someI2_ex
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  selectI2         -> someI2
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  selectI          -> someI
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  select1_equality -> some1_equality
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  Eps_sym_eq       -> some_sym_eq_trivial
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  Eps_eq           -> some_eq_trivial
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* HOL: exhaust_tac on datatypes superceded by new generic case_tac;
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* HOL: removed obsolete theorem binding expand_if (refer to split_if
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instead);
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* HOL: the recursion equations generated by 'recdef' are now called
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f.simps instead of f.rules;
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* HOL: qed_spec_mp now also handles bounded ALL as well;
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* HOL: 0 is now overloaded, so the type constraint ":: nat" may
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sometimes be needed;
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* HOL: the constant for "f``x" is now "image" rather than "op ``";
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* HOL: the constant for "f-``x" is now "vimage" rather than "op -``";
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* HOL: the disjoint sum is now "<+>" instead of "Plus"; the cartesian
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product is now "<*>" instead of "Times"; the lexicographic product is
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now "<*lex*>" instead of "**";
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* HOL: theory Sexp is now in HOL/Induct examples (it used to be part
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of main HOL, but was unused); better use HOL's datatype package;
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* HOL: removed "symbols" syntax for constant "override" of theory Map;
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the old syntax may be recovered as follows:
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  syntax (symbols)
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    override  :: "('a ~=> 'b) => ('a ~=> 'b) => ('a ~=> 'b)"
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      (infixl "\\<oplus>" 100)
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* HOL/Real: "rabs" replaced by overloaded "abs" function;
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* HOL/ML: even fewer consts are declared as global (see theories Ord,
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Lfp, Gfp, WF); this only affects ML packages that refer to const names
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internally;
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* HOL and ZF: syntax for quotienting wrt an equivalence relation
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changed from A/r to A//r;
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* ZF: new treatment of arithmetic (nat & int) may break some old
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proofs;
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* Isar: renamed some attributes (RS -> THEN, simplify -> simplified,
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rulify -> rule_format, elimify -> elim_format, ...);
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* Isar/Provers: intro/elim/dest attributes changed; renamed
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intro/intro!/intro!! flags to intro!/intro/intro? (in most cases, one
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should have to change intro!! to intro? only); replaced "delrule" by
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"rule del";
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* Isar/HOL: renamed "intrs" to "intros" in inductive definitions;
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* Provers: strengthened force_tac by using new first_best_tac;
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* LaTeX document preparation: several changes of isabelle.sty (see
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lib/texinputs);
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*** Document preparation ***
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* formal comments (text blocks etc.) in new-style theories may now
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contain antiquotations of thm/prop/term/typ/text to be presented
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according to latex print mode; concrete syntax is like this:
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@{term[show_types] "f(x) = a + x"};
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* isatool mkdir provides easy setup of Isabelle session directories,
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including proper document sources;
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* generated LaTeX sources are now deleted after successful run
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(isatool document -c); may retain a copy somewhere else via -D option
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of isatool usedir;
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* isatool usedir -D now lets isatool latex -o sty update the Isabelle
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style files, achieving self-contained LaTeX sources and simplifying
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LaTeX debugging;
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* old-style theories now produce (crude) LaTeX output as well;
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* browser info session directories are now self-contained (may be put
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on WWW server seperately); improved graphs of nested sessions; removed
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graph for 'all sessions';
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* several improvements in isabelle style files; \isabellestyle{it}
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produces fake math mode output; \isamarkupheader is now \section by
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default; see lib/texinputs/isabelle.sty etc.;
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*** Isar ***
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* Isar/Pure: local results and corresponding term bindings are now
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subject to Hindley-Milner polymorphism (similar to ML); this
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accommodates incremental type-inference very nicely;
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* Isar/Pure: new derived language element 'obtain' supports
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generalized existence reasoning;
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* Isar/Pure: new calculational elements 'moreover' and 'ultimately'
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support accumulation of results, without applying any rules yet;
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useful to collect intermediate results without explicit name
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references, and for use with transitivity rules with more than 2
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premises;
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* Isar/Pure: scalable support for case-analysis type proofs: new
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'case' language element refers to local contexts symbolically, as
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produced by certain proof methods; internally, case names are attached
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to theorems as "tags";
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* Isar/Pure: theory command 'hide' removes declarations from
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class/type/const name spaces;
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* Isar/Pure: theory command 'defs' supports option "(overloaded)" to
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indicate potential overloading;
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* Isar/Pure: changed syntax of local blocks from {{ }} to { };
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* Isar/Pure: syntax of sorts made 'inner', i.e. have to write
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"{a,b,c}" instead of {a,b,c};
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* Isar/Pure now provides its own version of intro/elim/dest
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attributes; useful for building new logics, but beware of confusion
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with the version in Provers/classical;
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* Isar/Pure: the local context of (non-atomic) goals is provided via
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case name 'antecedent';
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* Isar/Pure: removed obsolete 'transfer' attribute (transfer of thms
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to the current context is now done automatically);
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* Isar/Pure: theory command 'method_setup' provides a simple interface
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for definining proof methods in ML;
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* Isar/Provers: intro/elim/dest attributes changed; renamed
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intro/intro!/intro!! flags to intro!/intro/intro? (INCOMPATIBILITY, in
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most cases, one should have to change intro!! to intro? only);
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replaced "delrule" by "rule del";
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* Isar/Provers: new 'hypsubst' method, plain 'subst' method and
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'symmetric' attribute (the latter supercedes [RS sym]);
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* Isar/Provers: splitter support (via 'split' attribute and 'simp'
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method modifier); 'simp' method: 'only:' modifier removes loopers as
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well (including splits);
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* Isar/Provers: Simplifier and Classical methods now support all kind
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of modifiers used in the past, including 'cong', 'iff', etc.
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* Isar/Provers: added 'fastsimp' and 'clarsimp' methods (combination
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of Simplifier and Classical reasoner);
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* Isar/HOL: new proof method 'cases' and improved version of 'induct'
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now support named cases; major packages (inductive, datatype, primrec,
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recdef) support case names and properly name parameters;
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* Isar/HOL: new transitivity rules for substitution in inequalities --
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monotonicity conditions are extracted to be proven at end of
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calculations;
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* Isar/HOL: removed 'case_split' thm binding, should use 'cases' proof
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method anyway;
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* Isar/HOL: removed old expand_if = split_if; theorems if_splits =
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split_if split_if_asm; datatype package provides theorems foo.splits =
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foo.split foo.split_asm for each datatype;
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* Isar/HOL: tuned inductive package, rename "intrs" to "intros"
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(potential INCOMPATIBILITY), emulation of mk_cases feature for proof
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scripts: new 'inductive_cases' command and 'ind_cases' method; (Note:
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use "(cases (simplified))" method in proper proof texts);
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* Isar/HOL: added global 'arith_split' attribute for 'arith' method;
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* Isar: names of theorems etc. may be natural numbers as well;
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* Isar: 'pr' command: optional arguments for goals_limit and
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ProofContext.prems_limit; no longer prints theory contexts, but only
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proof states;
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* Isar: diagnostic commands 'pr', 'thm', 'prop', 'term', 'typ' admit
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additional print modes to be specified; e.g. "pr(latex)" will print
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proof state according to the Isabelle LaTeX style;
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* Isar: improved support for emulating tactic scripts, including proof
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methods 'rule_tac' etc., 'cut_tac', 'thin_tac', 'subgoal_tac',
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'rename_tac', 'rotate_tac', 'tactic', and 'case_tac' / 'induct_tac'
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(for HOL datatypes);
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* Isar: simplified (more robust) goal selection of proof methods: 1st
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goal, all goals, or explicit goal specifier (tactic emulation); thus
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'proof method scripts' have to be in depth-first order;
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* Isar: tuned 'let' syntax: replaced 'as' keyword by 'and';
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* Isar: removed 'help' command, which hasn't been too helpful anyway;
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should instead use individual commands for printing items
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(print_commands, print_methods etc.);
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* Isar: added 'nothing' --- the empty list of theorems;
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*** HOL ***
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* HOL/MicroJava: formalization of a fragment of Java, together with a
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corresponding virtual machine and a specification of its bytecode
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verifier and a lightweight bytecode verifier, including proofs of
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type-safety; by Gerwin Klein, Tobias Nipkow, David von Oheimb, and
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Cornelia Pusch (see also the homepage of project Bali at
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http://isabelle.in.tum.de/Bali/);
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* HOL/Algebra: new theory of rings and univariate polynomials, by
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Clemens Ballarin;
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* HOL/NumberTheory: fundamental Theorem of Arithmetic, Chinese
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Remainder Theorem, Fermat/Euler Theorem, Wilson's Theorem, by Thomas M
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Rasmussen;
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* HOL/Lattice: fundamental concepts of lattice theory and order
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structures, including duals, properties of bounds versus algebraic
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   354
laws, lattice operations versus set-theoretic ones, the Knaster-Tarski
wenzelm@10157
   355
Theorem for complete lattices etc.; may also serve as a demonstration
wenzelm@10157
   356
for abstract algebraic reasoning using axiomatic type classes, and
wenzelm@10157
   357
mathematics-style proof in Isabelle/Isar; by Markus Wenzel;
wenzelm@10157
   358
wenzelm@10003
   359
* HOL/Prolog: a (bare-bones) implementation of Lambda-Prolog, by David
wenzelm@10003
   360
von Oheimb;
paulson@9542
   361
wenzelm@10164
   362
* HOL/IMPP: extension of IMP with local variables and mutually
wenzelm@10164
   363
recursive procedures, by David von Oheimb;
wenzelm@10164
   364
wenzelm@10003
   365
* HOL/Lambda: converted into new-style theory and document;
paulson@9542
   366
wenzelm@10003
   367
* HOL/ex/Multiquote: example of multiple nested quotations and
wenzelm@10003
   368
anti-quotations -- basically a generalized version of de-Bruijn
wenzelm@10003
   369
representation; very useful in avoiding lifting of operations;
wenzelm@8848
   370
wenzelm@9612
   371
* HOL/record: added general record equality rule to simpset; fixed
wenzelm@9612
   372
select-update simplification procedure to handle extended records as
wenzelm@9612
   373
well; admit "r" as field name;
paulson@9542
   374
paulson@8967
   375
* HOL: 0 is now overloaded over the new sort "zero", allowing its use with
paulson@8967
   376
other numeric types and also as the identity of groups, rings, etc.;
paulson@8967
   377
paulson@8967
   378
* HOL: new axclass plus_ac0 for addition with the AC-laws and 0 as identity.
paulson@8967
   379
Types nat and int belong to this axclass;
paulson@8967
   380
wenzelm@10003
   381
* HOL: greatly improved simplification involving numerals of type nat, int, real:
paulson@8788
   382
   (i + #8 + j) = Suc k simplifies to  #7 + (i + j) = k
paulson@8832
   383
   i*j + k + j*#3*i     simplifies to  #4*(i*j) + k
paulson@8832
   384
  two terms #m*u and #n*u are replaced by #(m+n)*u
paulson@8832
   385
    (where #m, #n and u can implicitly be 1; this is simproc combine_numerals)
paulson@8832
   386
  and the term/formula #m*u+x ~~ #n*u+y simplifies simplifies to #(m-n)+x ~~ y
paulson@8832
   387
    or x ~~ #(n-m)+y, where ~~ is one of = < <= or - (simproc cancel_numerals);
paulson@8736
   388
wenzelm@10003
   389
* HOL: meson_tac is available (previously in ex/meson.ML); it is a
wenzelm@10003
   390
powerful prover for predicate logic but knows nothing of clasets; see
wenzelm@10003
   391
ex/mesontest.ML and ex/mesontest2.ML for example applications;
paulson@9835
   392
wenzelm@8848
   393
* HOL: new version of "case_tac" subsumes both boolean case split and
wenzelm@8440
   394
"exhaust_tac" on datatypes; INCOMPATIBILITY: exhaust_tac no longer
wenzelm@8518
   395
exists, may define val exhaust_tac = case_tac for ad-hoc portability;
wenzelm@8440
   396
wenzelm@8848
   397
* HOL: simplification no longer dives into case-expressions: only the
wenzelm@10129
   398
selector expression is simplified, but not the remaining arms; to
wenzelm@10129
   399
enable full simplification of case-expressions for datatype t, you may
wenzelm@10129
   400
remove t.weak_case_cong from the simpset, either globally (Delcongs
wenzelm@10129
   401
[thm"t.weak_case_cong"];) or locally (delcongs [...]).
nipkow@8603
   402
wenzelm@8848
   403
* HOL/recdef: the recursion equations generated by 'recdef' for
wenzelm@8848
   404
function 'f' are now called f.simps instead of f.rules; if all
wenzelm@8848
   405
termination conditions are proved automatically, these simplification
wenzelm@8848
   406
rules are added to the simpset, as in primrec; rules may be named
wenzelm@8848
   407
individually as well, resulting in a separate list of theorems for
wenzelm@8848
   408
each equation;
wenzelm@8848
   409
wenzelm@9489
   410
* HOL/While is a new theory that provides a while-combinator. It
wenzelm@9489
   411
permits the definition of tail-recursive functions without the
wenzelm@9489
   412
provision of a termination measure. The latter is necessary once the
wenzelm@9489
   413
invariant proof rule for while is applied.
nipkow@9457
   414
wenzelm@10003
   415
* HOL: new (overloaded) notation for the set of elements below/above
wenzelm@10003
   416
some element: {..u}, {..u(}, {l..}, {)l..}. See theory SetInterval.
nipkow@8925
   417
wenzelm@8848
   418
* HOL: theorems impI, allI, ballI bound as "strip";
wenzelm@8848
   419
wenzelm@10003
   420
* HOL: new tactic induct_thm_tac: thm -> string -> int -> tactic
nipkow@9746
   421
induct_tac th "x1 ... xn" expects th to have a conclusion of the form
nipkow@9746
   422
P v1 ... vn and abbreviates res_inst_tac [("v1","x1"),...,("vn","xn")] th;
nipkow@9746
   423
wenzelm@10003
   424
* HOL/Real: "rabs" replaced by overloaded "abs" function;
nipkow@9737
   425
wenzelm@10003
   426
* HOL: theory Sexp now in HOL/Induct examples (it used to be part of
wenzelm@10003
   427
main HOL, but was unused);
nipkow@8626
   428
wenzelm@10003
   429
* HOL: fewer consts declared as global (e.g. have to refer to
wenzelm@10003
   430
"Lfp.lfp" instead of "lfp" internally; affects ML packages only);
wenzelm@8887
   431
wenzelm@10003
   432
* HOL: tuned AST representation of nested pairs, avoiding bogus output
wenzelm@10003
   433
in case of overlap with user translations (e.g. judgements over
wenzelm@10003
   434
tuples); (note that the underlying logical represenation is still
wenzelm@10003
   435
bogus);
wenzelm@9349
   436
nipkow@8412
   437
paulson@9542
   438
*** ZF ***
paulson@9542
   439
wenzelm@10003
   440
* ZF: simplification automatically cancels common terms in arithmetic
wenzelm@10003
   441
expressions over nat and int;
paulson@9542
   442
wenzelm@10003
   443
* ZF: new treatment of nat to minimize type-checking: all operators
wenzelm@10003
   444
coerce their operands to a natural number using the function natify,
wenzelm@10003
   445
making the algebraic laws unconditional;
paulson@9542
   446
wenzelm@10003
   447
* ZF: as above, for int: operators coerce their operands to an integer
wenzelm@10003
   448
using the function intify;
paulson@9542
   449
wenzelm@10003
   450
* ZF: the integer library now contains many of the usual laws for the
wenzelm@10003
   451
orderings, including $<=, and monotonicity laws for $+ and $*;
paulson@9542
   452
wenzelm@10003
   453
* ZF: new example ZF/ex/NatSum to demonstrate integer arithmetic
wenzelm@10003
   454
simplification;
paulson@9388
   455
wenzelm@10003
   456
* FOL and ZF: AddIffs now available, giving theorems of the form P<->Q
wenzelm@10003
   457
to the simplifier and classical reasoner simultaneously;
paulson@9388
   458
paulson@9388
   459
wenzelm@8358
   460
*** General ***
wenzelm@8358
   461
wenzelm@10003
   462
* Provers: blast_tac now handles actual object-logic rules as
wenzelm@10003
   463
assumptions; note that auto_tac uses blast_tac internally as well;
wenzelm@10003
   464
wenzelm@10003
   465
* Provers: new functions rulify/rulify_no_asm: thm -> thm for turning
wenzelm@10003
   466
outer -->/All/Ball into ==>/!!; qed_spec_mp now uses rulify_no_asm;
wenzelm@10003
   467
wenzelm@9941
   468
* Provers: delrules now handles destruct rules as well (no longer need
wenzelm@9941
   469
explicit make_elim);
wenzelm@9941
   470
wenzelm@10003
   471
* Provers: Blast_tac now warns of and ignores "weak elimination rules" e.g.
wenzelm@10003
   472
  [| inj ?f;          ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
wenzelm@10003
   473
use instead the strong form,
wenzelm@10003
   474
  [| inj ?f; ~ ?W ==> ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
wenzelm@10003
   475
in HOL, FOL and ZF the function cla_make_elim will create such rules
wenzelm@10003
   476
from destruct-rules;
wenzelm@9489
   477
wenzelm@9709
   478
* Provers: Simplifier.easy_setup provides a fast path to basic
wenzelm@9709
   479
Simplifier setup for new object-logics;
wenzelm@9709
   480
wenzelm@9709
   481
* Pure: AST translation rules no longer require constant head on LHS;
wenzelm@9349
   482
wenzelm@9709
   483
* Pure: improved name spaces: ambiguous output is qualified; support
wenzelm@9709
   484
for hiding of names;
wenzelm@8729
   485
wenzelm@10003
   486
* system: smart setup of canonical ML_HOME, ISABELLE_INTERFACE, and
wenzelm@10003
   487
XSYMBOL_HOME; no longer need to do manual configuration in most
wenzelm@10003
   488
situations;
wenzelm@10003
   489
wenzelm@9709
   490
* system: compression of ML heaps images may now be controlled via -c
wenzelm@9709
   491
option of isabelle and isatool usedir (currently only observed by
wenzelm@9709
   492
Poly/ML);
wenzelm@8358
   493
wenzelm@9981
   494
* system: isatool installfonts may handle X-Symbol fonts as well (very
wenzelm@9981
   495
useful for remote X11);
wenzelm@9981
   496
wenzelm@9709
   497
* system: provide TAGS file for Isabelle sources;
wenzelm@9052
   498
wenzelm@9288
   499
* ML: infix 'OF' is a version of 'MRS' with more appropriate argument
wenzelm@9288
   500
order;
wenzelm@9288
   501
wenzelm@8994
   502
* ML: renamed flags Syntax.trace_norm_ast to Syntax.trace_ast; global
wenzelm@8994
   503
timing flag supersedes proof_timing and Toplevel.trace;
wenzelm@8994
   504
wenzelm@10003
   505
* ML: new combinators |>> and |>>> for incremental transformations
wenzelm@10003
   506
with secondary results (e.g. certain theory extensions):
wenzelm@10003
   507
wenzelm@9330
   508
* ML: PureThy.add_defs gets additional argument to indicate potential
wenzelm@9330
   509
overloading (usually false);
wenzelm@9330
   510
wenzelm@10003
   511
* ML: PureThy.add_thms/add_axioms/add_defs now return theorems as
wenzelm@10003
   512
results;
wenzelm@8440
   513
wenzelm@8358
   514
wenzelm@8015
   515
wenzelm@7986
   516
New in Isabelle99 (October 1999)
wenzelm@7986
   517
--------------------------------
oheimb@4649
   518
paulson@5931
   519
*** Overview of INCOMPATIBILITIES (see below for more details) ***
paulson@5931
   520
paulson@6922
   521
* HOL: The THEN and ELSE parts of conditional expressions (if P then x else y)
paulson@6922
   522
are no longer simplified.  (This allows the simplifier to unfold recursive
paulson@6922
   523
functional programs.)  To restore the old behaviour, declare
wenzelm@7215
   524
wenzelm@7215
   525
    Delcongs [if_weak_cong];
paulson@6922
   526
wenzelm@6269
   527
* HOL: Removed the obsolete syntax "Compl A"; use -A for set
wenzelm@6269
   528
complement;
paulson@5931
   529
wenzelm@6269
   530
* HOL: the predicate "inj" is now defined by translation to "inj_on";
paulson@6174
   531
berghofe@7847
   532
* HOL/datatype: mutual_induct_tac no longer exists --
berghofe@7847
   533
  use induct_tac "x_1 ... x_n" instead of mutual_induct_tac ["x_1", ..., "x_n"]
berghofe@7847
   534
wenzelm@6386
   535
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
   536
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
   537
wenzelm@6269
   538
* ZF: The con_defs part of an inductive definition may no longer refer
wenzelm@6269
   539
to constants declared in the same theory;
nipkow@6057
   540
wenzelm@6269
   541
* HOL, ZF: the function mk_cases, generated by the inductive
wenzelm@6269
   542
definition package, has lost an argument.  To simplify its result, it
wenzelm@6269
   543
uses the default simpset instead of a supplied list of theorems.
paulson@6141
   544
wenzelm@7215
   545
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
   546
nipkow@7619
   547
* Simplifier: the type of the infix ML functions
wenzelm@8729
   548
        setSSolver addSSolver setSolver addSolver
nipkow@7619
   549
is now  simpset * solver -> simpset  where `solver' is a new abstract type
nipkow@7619
   550
for packaging solvers. A solver is created via
wenzelm@8729
   551
        mk_solver: string -> (thm list -> int -> tactic) -> solver
nipkow@7619
   552
where the string argument is only a comment.
nipkow@6057
   553
wenzelm@7647
   554
paulson@6069
   555
*** Proof tools ***
paulson@6069
   556
wenzelm@6343
   557
* Provers/Arith/fast_lin_arith.ML contains a functor for creating a
wenzelm@6343
   558
decision procedure for linear arithmetic. Currently it is used for
wenzelm@7593
   559
types `nat', `int', and `real' in HOL (see below); it can, should and
wenzelm@7593
   560
will be instantiated for other types and logics as well.
paulson@6069
   561
nipkow@7324
   562
* The simplifier now accepts rewrite rules with flexible heads, eg
nipkow@7324
   563
     hom ?f ==> ?f(?x+?y) = ?f ?x + ?f ?y
nipkow@7324
   564
  They are applied like any rule with a non-pattern lhs, i.e. by first-order
nipkow@7324
   565
  matching.
paulson@6069
   566
wenzelm@7593
   567
paulson@6014
   568
*** General ***
paulson@6014
   569
wenzelm@7986
   570
* New Isabelle/Isar subsystem provides an alternative to traditional
wenzelm@7215
   571
tactical theorem proving; together with the ProofGeneral/isar user
wenzelm@7215
   572
interface it offers an interactive environment for developing human
wenzelm@7215
   573
readable proof documents (Isar == Intelligible semi-automated
wenzelm@7886
   574
reasoning); for further information see isatool doc isar-ref,
wenzelm@7986
   575
src/HOL/Isar_examples and http://isabelle.in.tum.de/Isar/
wenzelm@7886
   576
wenzelm@9612
   577
* improved and simplified presentation of theories: better HTML markup
wenzelm@9612
   578
(including colors), graph views in several sizes; isatool usedir now
wenzelm@9612
   579
provides a proper interface for user theories (via -P option); actual
wenzelm@9612
   580
document preparation based on (PDF)LaTeX is available as well (for
wenzelm@9612
   581
new-style theories only); see isatool doc system for more information;
wenzelm@7215
   582
wenzelm@7252
   583
* native support for Proof General, both for classic Isabelle and
wenzelm@7986
   584
Isabelle/Isar;
wenzelm@7215
   585
wenzelm@7791
   586
* ML function thm_deps visualizes dependencies of theorems and lemmas,
wenzelm@7791
   587
using the graph browser tool;
wenzelm@7791
   588
wenzelm@6751
   589
* Isabelle manuals now also available as PDF;
wenzelm@6751
   590
wenzelm@6449
   591
* theory loader rewritten from scratch (may not be fully
wenzelm@6449
   592
bug-compatible); old loadpath variable has been replaced by show_path,
wenzelm@6671
   593
add_path, del_path, reset_path functions; new operations such as
wenzelm@7593
   594
update_thy, touch_thy, remove_thy, use/update_thy_only (see also
wenzelm@7593
   595
isatool doc ref);
wenzelm@6449
   596
wenzelm@7215
   597
* improved isatool install: option -k creates KDE application icon,
wenzelm@7215
   598
option -p DIR installs standalone binaries;
wenzelm@7215
   599
wenzelm@7215
   600
* added ML_PLATFORM setting (useful for cross-platform installations);
wenzelm@7215
   601
more robust handling of platform specific ML images for SML/NJ;
wenzelm@7215
   602
wenzelm@7886
   603
* the settings environment is now statically scoped, i.e. it is never
wenzelm@7986
   604
created again in sub-processes invoked from isabelle, isatool, or
wenzelm@7886
   605
Isabelle;
wenzelm@7886
   606
wenzelm@7215
   607
* path element specification '~~' refers to '$ISABELLE_HOME';
wenzelm@7215
   608
wenzelm@6343
   609
* in locales, the "assumes" and "defines" parts may be omitted if
wenzelm@6343
   610
empty;
wenzelm@5973
   611
wenzelm@6269
   612
* new print_mode "xsymbols" for extended symbol support (e.g. genuine
wenzelm@6269
   613
long arrows);
wenzelm@6259
   614
wenzelm@6343
   615
* new print_mode "HTML";
wenzelm@6343
   616
wenzelm@6343
   617
* new flag show_tags controls display of tags of theorems (which are
wenzelm@6343
   618
basically just comments that may be attached by some tools);
wenzelm@6343
   619
wenzelm@6461
   620
* Isamode 2.6 requires patch to accomodate change of Isabelle font
wenzelm@6461
   621
mode and goal output format:
wenzelm@6461
   622
wenzelm@6461
   623
diff -r Isamode-2.6/elisp/isa-load.el Isamode/elisp/isa-load.el
wenzelm@6461
   624
244c244
wenzelm@6461
   625
<       (list (isa-getenv "ISABELLE") "-msymbols" logic-name)
wenzelm@6461
   626
---
wenzelm@6533
   627
>       (list (isa-getenv "ISABELLE") "-misabelle_font" "-msymbols" logic-name)
wenzelm@6461
   628
diff -r Isabelle-2.6/elisp/isa-proofstate.el Isamode/elisp/isa-proofstate.el
wenzelm@6461
   629
181c181
wenzelm@6461
   630
< (defconst proofstate-proofstart-regexp "^Level [0-9]+$"
wenzelm@6461
   631
---
wenzelm@6461
   632
> (defconst proofstate-proofstart-regexp "^Level [0-9]+"
wenzelm@6461
   633
wenzelm@7450
   634
* function bind_thms stores lists of theorems (cf. bind_thm);
wenzelm@7450
   635
wenzelm@7593
   636
* new shorthand tactics ftac, eatac, datac, fatac;
wenzelm@7593
   637
wenzelm@7593
   638
* qed (and friends) now accept "" as result name; in that case the
wenzelm@7986
   639
theorem is not stored, but proper checks and presentation of the
wenzelm@7986
   640
result still apply;
wenzelm@7593
   641
wenzelm@7805
   642
* theorem database now also indexes constants "Trueprop", "all",
wenzelm@7805
   643
"==>", "=="; thus thms_containing, findI etc. may retrieve more rules;
wenzelm@7805
   644
oheimb@6028
   645
nipkow@6057
   646
*** HOL ***
nipkow@6057
   647
wenzelm@7215
   648
** HOL arithmetic **
wenzelm@7215
   649
wenzelm@6343
   650
* There are now decision procedures for linear arithmetic over nat and
wenzelm@6343
   651
int:
nipkow@6131
   652
wenzelm@6343
   653
1. arith_tac copes with arbitrary formulae involving `=', `<', `<=',
wenzelm@6343
   654
`+', `-', `Suc', `min', `max' and numerical constants; other subterms
wenzelm@6343
   655
are treated as atomic; subformulae not involving type `nat' or `int'
wenzelm@6343
   656
are ignored; quantified subformulae are ignored unless they are
wenzelm@6343
   657
positive universal or negative existential. The tactic has to be
wenzelm@6343
   658
invoked by hand and can be a little bit slow. In particular, the
wenzelm@6343
   659
running time is exponential in the number of occurrences of `min' and
wenzelm@6343
   660
`max', and `-' on `nat'.
nipkow@6131
   661
wenzelm@6343
   662
2. fast_arith_tac is a cut-down version of arith_tac: it only takes
wenzelm@6343
   663
(negated) (in)equalities among the premises and the conclusion into
wenzelm@6343
   664
account (i.e. no compound formulae) and does not know about `min' and
wenzelm@6343
   665
`max', and `-' on `nat'. It is fast and is used automatically by the
wenzelm@6343
   666
simplifier.
nipkow@6131
   667
wenzelm@6343
   668
NB: At the moment, these decision procedures do not cope with mixed
wenzelm@6343
   669
nat/int formulae where the two parts interact, such as `m < n ==>
wenzelm@6343
   670
int(m) < int(n)'.
oheimb@6028
   671
wenzelm@7215
   672
* HOL/Numeral provides a generic theory of numerals (encoded
wenzelm@7313
   673
efficiently as bit strings); setup for types nat/int/real is in place;
wenzelm@7215
   674
INCOMPATIBILITY: since numeral syntax is now polymorphic, rather than
wenzelm@7215
   675
int, existing theories and proof scripts may require a few additional
wenzelm@7215
   676
type constraints;
wenzelm@7215
   677
wenzelm@7215
   678
* integer division and remainder can now be performed on constant
wenzelm@7215
   679
arguments;
paulson@7157
   680
wenzelm@7215
   681
* many properties of integer multiplication, division and remainder
wenzelm@7215
   682
are now available;
paulson@6922
   683
paulson@7287
   684
* An interface to the Stanford Validity Checker (SVC) is available through the
paulson@7287
   685
tactic svc_tac.  Propositional tautologies and theorems of linear arithmetic
paulson@7287
   686
are proved automatically.  SVC must be installed separately, and its results
paulson@7287
   687
must be TAKEN ON TRUST (Isabelle does not check the proofs, but tags any
paulson@7287
   688
invocation of the underlying oracle).  For SVC see
paulson@7444
   689
  http://verify.stanford.edu/SVC
paulson@6922
   690
wenzelm@7125
   691
* IsaMakefile: the HOL-Real target now builds an actual image;
wenzelm@7125
   692
wenzelm@7215
   693
wenzelm@7215
   694
** HOL misc **
wenzelm@7215
   695
wenzelm@7595
   696
* HOL/Real/HahnBanach: the Hahn-Banach theorem for real vector spaces
wenzelm@7595
   697
(in Isabelle/Isar) -- by Gertrud Bauer;
wenzelm@7595
   698
wenzelm@7691
   699
* HOL/BCV: generic model of bytecode verification, i.e. data-flow
wenzelm@7691
   700
analysis for assembly languages with subtypes;
wenzelm@7691
   701
wenzelm@6278
   702
* HOL/TLA (Lamport's Temporal Logic of Actions): major reorganization
wenzelm@6278
   703
-- avoids syntactic ambiguities and treats state, transition, and
wenzelm@6278
   704
temporal levels more uniformly; introduces INCOMPATIBILITIES due to
wenzelm@6278
   705
changed syntax and (many) tactics;
wenzelm@6278
   706
wenzelm@7791
   707
* HOL/inductive: Now also handles more general introduction rules such
wenzelm@7791
   708
  as "ALL y. (y, x) : r --> y : acc r ==> x : acc r"; monotonicity
wenzelm@7791
   709
  theorems are now maintained within the theory (maintained via the
wenzelm@7791
   710
  "mono" attribute);
berghofe@7780
   711
wenzelm@7238
   712
* HOL/datatype: Now also handles arbitrarily branching datatypes
wenzelm@7238
   713
  (using function types) such as
wenzelm@7238
   714
wenzelm@7238
   715
  datatype 'a tree = Atom 'a | Branch "nat => 'a tree"
berghofe@7047
   716
wenzelm@7326
   717
* HOL/record: record_simproc (part of the default simpset) takes care
wenzelm@7326
   718
of selectors applied to updated records; record_split_tac is no longer
wenzelm@7327
   719
part of the default claset; update_defs may now be removed from the
wenzelm@7327
   720
simpset in many cases; COMPATIBILITY: old behavior achieved by
wenzelm@7326
   721
wenzelm@7326
   722
  claset_ref () := claset() addSWrapper record_split_wrapper;
wenzelm@7326
   723
  Delsimprocs [record_simproc]
wenzelm@7326
   724
wenzelm@6386
   725
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
   726
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
   727
paulson@7287
   728
* HOL/recdef (TFL): 'congs' syntax now expects comma separated list of theorem
paulson@7287
   729
names rather than an ML expression;
paulson@7287
   730
paulson@7287
   731
* HOL/defer_recdef (TFL): like recdef but the well-founded relation can be
paulson@7287
   732
supplied later.  Program schemes can be defined, such as
paulson@7287
   733
    "While B C s = (if B s then While B C (C s) else s)"
paulson@7287
   734
where the well-founded relation can be chosen after B and C have been given.
wenzelm@6563
   735
wenzelm@7215
   736
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
   737
INCOMPATIBILITY: while [] and infix # syntax is still there, of
wenzelm@7215
   738
course, ML tools referring to List.list.op # etc. have to be adapted;
wenzelm@7215
   739
wenzelm@7238
   740
* HOL_quantifiers flag superseded by "HOL" print mode, which is
wenzelm@7238
   741
disabled by default; run isabelle with option -m HOL to get back to
wenzelm@7238
   742
the original Gordon/HOL-style output;
wenzelm@7238
   743
wenzelm@7238
   744
* HOL/Ord.thy: new bounded quantifier syntax (input only): ALL x<y. P,
wenzelm@7238
   745
ALL x<=y. P, EX x<y. P, EX x<=y. P;
wenzelm@7238
   746
wenzelm@7238
   747
* HOL basic syntax simplified (more orthogonal): all variants of
wenzelm@7238
   748
All/Ex now support plain / symbolic / HOL notation; plain syntax for
wenzelm@7238
   749
Eps operator is provided as well: "SOME x. P[x]";
wenzelm@7238
   750
berghofe@7320
   751
* HOL/Sum.thy: sum_case has been moved to HOL/Datatype;
wenzelm@7261
   752
wenzelm@7280
   753
* HOL/Univ.thy: infix syntax <*>, <+>, <**>, <+> eliminated and made
wenzelm@7280
   754
thus available for user theories;
wenzelm@7280
   755
wenzelm@7300
   756
* HOLCF/IOA/Sequents: renamed 'Cons' to 'Consq' to avoid clash with
wenzelm@7300
   757
HOL/List; hardly an INCOMPATIBILITY since '>>' syntax is used all the
wenzelm@7300
   758
time;
wenzelm@7300
   759
wenzelm@7986
   760
* HOL: new tactic smp_tac: int -> int -> tactic, which applies spec
wenzelm@7986
   761
several times and then mp;
oheimb@7492
   762
wenzelm@7215
   763
paulson@7113
   764
*** LK ***
paulson@7113
   765
wenzelm@7215
   766
* the notation <<...>> is now available as a notation for sequences of
wenzelm@7215
   767
formulas;
paulson@7113
   768
paulson@7113
   769
* the simplifier is now installed
paulson@7113
   770
wenzelm@8729
   771
* the axiom system has been generalized (thanks to Soren Heilmann)
paulson@7113
   772
paulson@7113
   773
* the classical reasoner now has a default rule database
paulson@7113
   774
paulson@7113
   775
paulson@6064
   776
*** ZF ***
paulson@6064
   777
paulson@6064
   778
* new primrec section allows primitive recursive functions to be given
wenzelm@6269
   779
directly (as in HOL) over datatypes and the natural numbers;
paulson@6064
   780
wenzelm@6269
   781
* new tactics induct_tac and exhaust_tac for induction (or case
wenzelm@6269
   782
analysis) over datatypes and the natural numbers;
paulson@6064
   783
paulson@6064
   784
* the datatype declaration of type T now defines the recursor T_rec;
paulson@6064
   785
paulson@6141
   786
* simplification automatically does freeness reasoning for datatype
wenzelm@6269
   787
constructors;
paulson@6141
   788
wenzelm@6269
   789
* automatic type-inference, with AddTCs command to insert new
wenzelm@6269
   790
type-checking rules;
paulson@6155
   791
wenzelm@6269
   792
* datatype introduction rules are now added as Safe Introduction rules
wenzelm@6269
   793
to the claset;
paulson@6155
   794
wenzelm@6269
   795
* the syntax "if P then x else y" is now available in addition to
wenzelm@6269
   796
if(P,x,y);
wenzelm@6269
   797
paulson@6069
   798
wenzelm@6343
   799
*** Internal programming interfaces ***
wenzelm@6343
   800
wenzelm@7919
   801
* tuned simplifier trace output; new flag debug_simp;
wenzelm@7919
   802
wenzelm@7420
   803
* structures Vartab / Termtab (instances of TableFun) offer efficient
wenzelm@7420
   804
tables indexed by indexname_ord / term_ord (compatible with aconv);
wenzelm@7420
   805
wenzelm@6386
   806
* AxClass.axclass_tac lost the theory argument;
wenzelm@6386
   807
wenzelm@6343
   808
* tuned current_goals_markers semantics: begin / end goal avoids
wenzelm@6343
   809
printing empty lines;
wenzelm@6343
   810
wenzelm@6343
   811
* removed prs and prs_fn hook, which was broken because it did not
wenzelm@6343
   812
include \n in its semantics, forcing writeln to add one
wenzelm@6343
   813
uncoditionally; replaced prs_fn by writeln_fn; consider std_output:
wenzelm@6343
   814
string -> unit if you really want to output text without newline;
wenzelm@6343
   815
wenzelm@6343
   816
* Symbol.output subject to print mode; INCOMPATIBILITY: defaults to
wenzelm@6343
   817
plain output, interface builders may have to enable 'isabelle_font'
wenzelm@6343
   818
mode to get Isabelle font glyphs as before;
wenzelm@6343
   819
wenzelm@6343
   820
* refined token_translation interface; INCOMPATIBILITY: output length
wenzelm@6343
   821
now of type real instead of int;
wenzelm@6343
   822
wenzelm@7196
   823
* theory loader actions may be traced via new ThyInfo.add_hook
wenzelm@7196
   824
interface (see src/Pure/Thy/thy_info.ML); example application: keep
wenzelm@7196
   825
your own database of information attached to *whole* theories -- as
wenzelm@7196
   826
opposed to intra-theory data slots offered via TheoryDataFun;
wenzelm@7196
   827
wenzelm@7647
   828
* proper handling of dangling sort hypotheses (at last!);
wenzelm@7647
   829
Thm.strip_shyps and Drule.strip_shyps_warning take care of removing
wenzelm@7647
   830
extra sort hypotheses that can be witnessed from the type signature;
wenzelm@7986
   831
the force_strip_shyps flag is gone, any remaining shyps are simply
wenzelm@7986
   832
left in the theorem (with a warning issued by strip_shyps_warning);
wenzelm@7647
   833
wenzelm@6343
   834
paulson@6064
   835
wenzelm@5781
   836
New in Isabelle98-1 (October 1998)
wenzelm@5781
   837
----------------------------------
wenzelm@5781
   838
wenzelm@5127
   839
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4842
   840
wenzelm@5726
   841
* several changes of automated proof tools;
wenzelm@5373
   842
wenzelm@5726
   843
* HOL: major changes to the inductive and datatype packages, including
wenzelm@5726
   844
some minor incompatibilities of theory syntax;
berghofe@5214
   845
wenzelm@5726
   846
* HOL: renamed r^-1 to 'converse' from 'inverse'; 'inj_onto' is now
wenzelm@5217
   847
called `inj_on';
paulson@5160
   848
nipkow@5275
   849
* HOL: removed duplicate thms in Arith:
nipkow@5275
   850
  less_imp_add_less  should be replaced by  trans_less_add1
nipkow@5275
   851
  le_imp_add_le      should be replaced by  trans_le_add1
paulson@5160
   852
wenzelm@5726
   853
* HOL: unary minus is now overloaded (new type constraints may be
wenzelm@5726
   854
required);
paulson@5490
   855
wenzelm@5726
   856
* HOL and ZF: unary minus for integers is now #- instead of #~.  In
wenzelm@5726
   857
ZF, expressions such as n#-1 must be changed to n#- 1, since #-1 is
wenzelm@5726
   858
now taken as an integer constant.
paulson@5541
   859
wenzelm@5726
   860
* Pure: ML function 'theory_of' renamed to 'theory';
wenzelm@5397
   861
wenzelm@5363
   862
wenzelm@5127
   863
*** Proof tools ***
nipkow@4880
   864
nipkow@5657
   865
* Simplifier:
nipkow@5657
   866
  1. Asm_full_simp_tac is now more aggressive.
nipkow@5657
   867
     1. It will sometimes reorient premises if that increases their power to
nipkow@5657
   868
        simplify.
nipkow@5657
   869
     2. It does no longer proceed strictly from left to right but may also
nipkow@5657
   870
        rotate premises to achieve further simplification.
nipkow@5657
   871
     For compatibility reasons there is now Asm_lr_simp_tac which is like the
nipkow@5657
   872
     old Asm_full_simp_tac in that it does not rotate premises.
nipkow@5657
   873
  2. The simplifier now knows a little bit about nat-arithmetic.
nipkow@4880
   874
wenzelm@5127
   875
* Classical reasoner: wrapper mechanism for the classical reasoner now
wenzelm@5127
   876
allows for selected deletion of wrappers, by introduction of names for
wenzelm@5127
   877
wrapper functionals.  This implies that addbefore, addSbefore,
wenzelm@5127
   878
addaltern, and addSaltern now take a pair (name, tactic) as argument,
wenzelm@5127
   879
and that adding two tactics with the same name overwrites the first
wenzelm@5127
   880
one (emitting a warning).
oheimb@4824
   881
  type wrapper = (int -> tactic) -> (int -> tactic)
oheimb@4649
   882
  setWrapper, setSWrapper, compWrapper and compSWrapper are replaced by
oheimb@4824
   883
  addWrapper, addSWrapper: claset * (string * wrapper) -> claset
oheimb@4824
   884
  delWrapper, delSWrapper: claset *  string            -> claset
oheimb@4649
   885
  getWrapper is renamed to appWrappers, getSWrapper to appSWrappers;
oheimb@4649
   886
wenzelm@5705
   887
* Classical reasoner: addbefore/addSbefore now have APPEND/ORELSE
wenzelm@5726
   888
semantics; addbefore now affects only the unsafe part of step_tac
wenzelm@5726
   889
etc.; this affects addss/auto_tac/force_tac, so EXISTING PROOFS MAY
wenzelm@5726
   890
FAIL, but proofs should be fixable easily, e.g. by replacing Auto_tac
wenzelm@5726
   891
by Force_tac;
oheimb@5524
   892
wenzelm@5726
   893
* Classical reasoner: setwrapper to setWrapper and compwrapper to
wenzelm@5726
   894
compWrapper; added safe wrapper (and access functions for it);
oheimb@5524
   895
wenzelm@5127
   896
* HOL/split_all_tac is now much faster and fails if there is nothing
wenzelm@5726
   897
to split.  Some EXISTING PROOFS MAY REQUIRE ADAPTION because the order
wenzelm@5726
   898
and the names of the automatically generated variables have changed.
wenzelm@5726
   899
split_all_tac has moved within claset() from unsafe wrappers to safe
wenzelm@5726
   900
wrappers, which means that !!-bound variables are split much more
wenzelm@5726
   901
aggressively, and safe_tac and clarify_tac now split such variables.
wenzelm@5726
   902
If this splitting is not appropriate, use delSWrapper "split_all_tac".
wenzelm@5726
   903
Note: the same holds for record_split_tac, which does the job of
wenzelm@5726
   904
split_all_tac for record fields.
wenzelm@5127
   905
wenzelm@5726
   906
* HOL/Simplifier: Rewrite rules for case distinctions can now be added
wenzelm@5726
   907
permanently to the default simpset using Addsplits just like
wenzelm@5726
   908
Addsimps. They can be removed via Delsplits just like
wenzelm@5726
   909
Delsimps. Lower-case versions are also available.
wenzelm@5127
   910
wenzelm@5726
   911
* HOL/Simplifier: The rule split_if is now part of the default
wenzelm@5726
   912
simpset. This means that the simplifier will eliminate all occurrences
wenzelm@5726
   913
of if-then-else in the conclusion of a goal. To prevent this, you can
wenzelm@5726
   914
either remove split_if completely from the default simpset by
wenzelm@5726
   915
`Delsplits [split_if]' or remove it in a specific call of the
wenzelm@5726
   916
simplifier using `... delsplits [split_if]'.  You can also add/delete
wenzelm@5726
   917
other case splitting rules to/from the default simpset: every datatype
wenzelm@5726
   918
generates suitable rules `split_t_case' and `split_t_case_asm' (where
wenzelm@5726
   919
t is the name of the datatype).
wenzelm@5127
   920
wenzelm@5726
   921
* Classical reasoner / Simplifier combination: new force_tac (and
wenzelm@5127
   922
derivatives Force_tac, force) combines rewriting and classical
wenzelm@5127
   923
reasoning (and whatever other tools) similarly to auto_tac, but is
wenzelm@5726
   924
aimed to solve the given subgoal completely.
wenzelm@5127
   925
wenzelm@5127
   926
wenzelm@5127
   927
*** General ***
wenzelm@5127
   928
wenzelm@5217
   929
* new top-level commands `Goal' and `Goalw' that improve upon `goal'
wenzelm@5127
   930
and `goalw': the theory is no longer needed as an explicit argument -
wenzelm@5127
   931
the current theory context is used; assumptions are no longer returned
wenzelm@5127
   932
at the ML-level unless one of them starts with ==> or !!; it is
wenzelm@5217
   933
recommended to convert to these new commands using isatool fixgoal
wenzelm@5217
   934
(backup your sources first!);
wenzelm@4842
   935
wenzelm@5217
   936
* new top-level commands 'thm' and 'thms' for retrieving theorems from
wenzelm@5207
   937
the current theory context, and 'theory' to lookup stored theories;
paulson@4806
   938
paulson@5722
   939
* new theory section 'locale' for declaring constants, assumptions and
paulson@5722
   940
definitions that have local scope;
paulson@5722
   941
wenzelm@5127
   942
* new theory section 'nonterminals' for purely syntactic types;
wenzelm@4858
   943
wenzelm@5127
   944
* new theory section 'setup' for generic ML setup functions
wenzelm@5127
   945
(e.g. package initialization);
wenzelm@4869
   946
wenzelm@5131
   947
* the distribution now includes Isabelle icons: see
wenzelm@5131
   948
lib/logo/isabelle-{small,tiny}.xpm;
wenzelm@5131
   949
wenzelm@5363
   950
* isatool install - install binaries with absolute references to
wenzelm@5363
   951
ISABELLE_HOME/bin;
wenzelm@5363
   952
wenzelm@5572
   953
* isatool logo -- create instances of the Isabelle logo (as EPS);
wenzelm@5572
   954
wenzelm@5407
   955
* print mode 'emacs' reserved for Isamode;
wenzelm@5407
   956
wenzelm@5726
   957
* support multiple print (ast) translations per constant name;
wenzelm@5726
   958
wenzelm@6925
   959
* theorems involving oracles are now printed with a suffixed [!];
wenzelm@6925
   960
wenzelm@4711
   961
paulson@4661
   962
*** HOL ***
paulson@4661
   963
wenzelm@5710
   964
* there is now a tutorial on Isabelle/HOL (do 'isatool doc tutorial');
nipkow@5709
   965
wenzelm@5217
   966
* HOL/inductive package reorganized and improved: now supports mutual
paulson@5267
   967
definitions such as
wenzelm@5217
   968
wenzelm@5217
   969
  inductive EVEN ODD
wenzelm@5217
   970
    intrs
wenzelm@5217
   971
      null "0 : EVEN"
wenzelm@5217
   972
      oddI "n : EVEN ==> Suc n : ODD"
wenzelm@5217
   973
      evenI "n : ODD ==> Suc n : EVEN"
wenzelm@5217
   974
wenzelm@5217
   975
new theorem list "elims" contains an elimination rule for each of the
wenzelm@5217
   976
recursive sets; inductive definitions now handle disjunctive premises
wenzelm@5217
   977
correctly (also ZF);
berghofe@5214
   978
wenzelm@5217
   979
INCOMPATIBILITIES: requires Inductive as an ancestor; component
wenzelm@5217
   980
"mutual_induct" no longer exists - the induction rule is always
wenzelm@5217
   981
contained in "induct";
wenzelm@5217
   982
wenzelm@5217
   983
wenzelm@5217
   984
* HOL/datatype package re-implemented and greatly improved: now
paulson@5267
   985
supports mutually recursive datatypes such as
wenzelm@5217
   986
wenzelm@5217
   987
  datatype
wenzelm@5217
   988
    'a aexp = IF_THEN_ELSE ('a bexp) ('a aexp) ('a aexp)
wenzelm@5217
   989
            | SUM ('a aexp) ('a aexp)
wenzelm@5217
   990
            | DIFF ('a aexp) ('a aexp)
wenzelm@5217
   991
            | NUM 'a
wenzelm@5217
   992
  and
wenzelm@5217
   993
    'a bexp = LESS ('a aexp) ('a aexp)
wenzelm@5217
   994
            | AND ('a bexp) ('a bexp)
wenzelm@5217
   995
            | OR ('a bexp) ('a bexp)
wenzelm@5217
   996
paulson@5267
   997
as well as indirectly recursive datatypes such as
berghofe@5214
   998
wenzelm@5217
   999
  datatype
wenzelm@5217
  1000
    ('a, 'b) term = Var 'a
wenzelm@5217
  1001
                  | App 'b ((('a, 'b) term) list)
berghofe@5214
  1002
wenzelm@5217
  1003
The new tactic  mutual_induct_tac [<var_1>, ..., <var_n>] i  performs
wenzelm@5217
  1004
induction on mutually / indirectly recursive datatypes.
wenzelm@5217
  1005
wenzelm@5217
  1006
Primrec equations are now stored in theory and can be accessed via
wenzelm@5217
  1007
<function_name>.simps.
wenzelm@5217
  1008
wenzelm@5217
  1009
INCOMPATIBILITIES:
berghofe@5214
  1010
wenzelm@5217
  1011
  - Theories using datatypes must now have theory Datatype as an
wenzelm@5217
  1012
    ancestor.
wenzelm@5217
  1013
  - The specific <typename>.induct_tac no longer exists - use the
wenzelm@5217
  1014
    generic induct_tac instead.
berghofe@5226
  1015
  - natE has been renamed to nat.exhaust - use exhaust_tac
wenzelm@5217
  1016
    instead of res_inst_tac ... natE. Note that the variable
berghofe@5226
  1017
    names in nat.exhaust differ from the names in natE, this
wenzelm@5217
  1018
    may cause some "fragile" proofs to fail.
wenzelm@5217
  1019
  - The theorems split_<typename>_case and split_<typename>_case_asm
wenzelm@5217
  1020
    have been renamed to <typename>.split and <typename>.split_asm.
wenzelm@5217
  1021
  - Since default sorts of type variables are now handled correctly,
wenzelm@5217
  1022
    some datatype definitions may have to be annotated with explicit
wenzelm@5217
  1023
    sort constraints.
wenzelm@5217
  1024
  - Primrec definitions no longer require function name and type
wenzelm@5217
  1025
    of recursive argument.
berghofe@5214
  1026
wenzelm@5217
  1027
Consider using isatool fixdatatype to adapt your theories and proof
wenzelm@5217
  1028
scripts to the new package (backup your sources first!).
wenzelm@5217
  1029
wenzelm@5217
  1030
wenzelm@5726
  1031
* HOL/record package: considerably improved implementation; now
wenzelm@5726
  1032
includes concrete syntax for record types, terms, updates; theorems
wenzelm@5726
  1033
for surjective pairing and splitting !!-bound record variables; proof
wenzelm@5726
  1034
support is as follows:
wenzelm@5726
  1035
wenzelm@5726
  1036
  1) standard conversions (selectors or updates applied to record
wenzelm@5726
  1037
constructor terms) are part of the standard simpset;
wenzelm@5726
  1038
wenzelm@5726
  1039
  2) inject equations of the form ((x, y) = (x', y')) == x=x' & y=y' are
wenzelm@5726
  1040
made part of standard simpset and claset via addIffs;
wenzelm@5726
  1041
wenzelm@5726
  1042
  3) a tactic for record field splitting (record_split_tac) is part of
wenzelm@5726
  1043
the standard claset (addSWrapper);
wenzelm@5726
  1044
wenzelm@5726
  1045
To get a better idea about these rules you may retrieve them via
wenzelm@5726
  1046
something like 'thms "foo.simps"' or 'thms "foo.iffs"', where "foo" is
wenzelm@5726
  1047
the name of your record type.
wenzelm@5726
  1048
wenzelm@5726
  1049
The split tactic 3) conceptually simplifies by the following rule:
wenzelm@5726
  1050
wenzelm@5726
  1051
  "(!!x. PROP ?P x) == (!!a b. PROP ?P (a, b))"
wenzelm@5726
  1052
wenzelm@5726
  1053
Thus any record variable that is bound by meta-all will automatically
wenzelm@5726
  1054
blow up into some record constructor term, consequently the
wenzelm@5726
  1055
simplifications of 1), 2) apply.  Thus force_tac, auto_tac etc. shall
wenzelm@5726
  1056
solve record problems automatically.
wenzelm@5726
  1057
berghofe@5214
  1058
wenzelm@5125
  1059
* reorganized the main HOL image: HOL/Integ and String loaded by
wenzelm@5125
  1060
default; theory Main includes everything;
wenzelm@5125
  1061
paulson@5650
  1062
* automatic simplification of integer sums and comparisons, using cancellation;
paulson@5650
  1063
oheimb@5526
  1064
* added option_map_eq_Some and not_Some_eq to the default simpset and claset;
wenzelm@5127
  1065
wenzelm@5127
  1066
* added disj_not1 = "(~P | Q) = (P --> Q)" to the default simpset;
wenzelm@5127
  1067
wenzelm@5127
  1068
* many new identities for unions, intersections, set difference, etc.;
wenzelm@5127
  1069
wenzelm@5127
  1070
* expand_if, expand_split, expand_sum_case and expand_nat_case are now
wenzelm@5127
  1071
called split_if, split_split, split_sum_case and split_nat_case (to go
wenzelm@5127
  1072
with add/delsplits);
wenzelm@5125
  1073
wenzelm@5127
  1074
* HOL/Prod introduces simplification procedure unit_eq_proc rewriting
wenzelm@5127
  1075
(?x::unit) = (); this is made part of the default simpset, which COULD
wenzelm@5127
  1076
MAKE EXISTING PROOFS FAIL under rare circumstances (consider
wenzelm@5207
  1077
'Delsimprocs [unit_eq_proc];' as last resort); also note that
wenzelm@5207
  1078
unit_abs_eta_conv is added in order to counter the effect of
wenzelm@5207
  1079
unit_eq_proc on (%u::unit. f u), replacing it by f rather than by
wenzelm@5207
  1080
%u.f();
wenzelm@5125
  1081
wenzelm@5217
  1082
* HOL/Fun INCOMPATIBILITY: `inj_onto' is now called `inj_on' (which
wenzelm@5217
  1083
makes more sense);
berghofe@5109
  1084
paulson@5475
  1085
* HOL/Set INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
  1086
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
  1087
  disjointness reasoning but breaking a few old proofs.
paulson@5267
  1088
wenzelm@5217
  1089
* HOL/Relation INCOMPATIBILITY: renamed the relational operator r^-1
wenzelm@5217
  1090
to 'converse' from 'inverse' (for compatibility with ZF and some
wenzelm@5217
  1091
literature);
wenzelm@5085
  1092
wenzelm@5127
  1093
* HOL/recdef can now declare non-recursive functions, with {} supplied as
wenzelm@5127
  1094
the well-founded relation;
oheimb@4838
  1095
paulson@5490
  1096
* HOL/Set INCOMPATIBILITY: the complement of set A is now written -A instead of
paulson@5490
  1097
    Compl A.  The "Compl" syntax remains available as input syntax for this
paulson@5490
  1098
    release ONLY.
paulson@5490
  1099
wenzelm@5127
  1100
* HOL/Update: new theory of function updates:
wenzelm@5127
  1101
    f(a:=b) == %x. if x=a then b else f x
wenzelm@5127
  1102
may also be iterated as in f(a:=b,c:=d,...);
nipkow@5077
  1103
wenzelm@5127
  1104
* HOL/Vimage: new theory for inverse image of a function, syntax f-``B;
paulson@4899
  1105
nipkow@5282
  1106
* HOL/List:
nipkow@5282
  1107
  - new function list_update written xs[i:=v] that updates the i-th
nipkow@5282
  1108
    list position. May also be iterated as in xs[i:=a,j:=b,...].
nipkow@5428
  1109
  - new function `upt' written [i..j(] which generates the list
nipkow@5428
  1110
    [i,i+1,...,j-1], i.e. the upper bound is excluded. To include the upper
nipkow@5428
  1111
    bound write [i..j], which is a shorthand for [i..j+1(].
nipkow@5282
  1112
  - new lexicographic orderings and corresponding wellfoundedness theorems.
paulson@4779
  1113
wenzelm@5127
  1114
* HOL/Arith:
wenzelm@5127
  1115
  - removed 'pred' (predecessor) function;
wenzelm@5127
  1116
  - generalized some theorems about n-1;
wenzelm@5127
  1117
  - many new laws about "div" and "mod";
wenzelm@5127
  1118
  - new laws about greatest common divisors (see theory ex/Primes);
oheimb@4766
  1119
wenzelm@5127
  1120
* HOL/Relation: renamed the relational operator r^-1 "converse"
wenzelm@4842
  1121
instead of "inverse";
wenzelm@4711
  1122
nipkow@5651
  1123
* HOL/Induct/Multiset: a theory of multisets, including the wellfoundedness
nipkow@5651
  1124
  of the multiset ordering;
nipkow@5651
  1125
wenzelm@5127
  1126
* directory HOL/Real: a construction of the reals using Dedekind cuts
nipkow@5651
  1127
  (not included by default);
nipkow@4835
  1128
wenzelm@5127
  1129
* directory HOL/UNITY: Chandy and Misra's UNITY formalism;
wenzelm@4711
  1130
nipkow@5651
  1131
* directory HOL/Hoare: a new version of Hoare logic which permits many-sorted
nipkow@5651
  1132
  programs, i.e. different program variables may have different types.
nipkow@5651
  1133
paulson@5142
  1134
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
  1135
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
  1136
  Now rew can involve either definitions or equalities (either == or =).
wenzelm@5002
  1137
wenzelm@5363
  1138
paulson@4879
  1139
*** ZF ***
paulson@4879
  1140
paulson@5332
  1141
* theory Main includes everything; INCOMPATIBILITY: theory ZF.thy contains
paulson@5332
  1142
  only the theorems proved on ZF.ML;
paulson@5160
  1143
paulson@5475
  1144
* ZF INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
  1145
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
  1146
  disjointness reasoning but breaking a few old proofs.
paulson@5267
  1147
paulson@5160
  1148
* ZF/Update: new theory of function updates
paulson@5160
  1149
    with default rewrite rule  f(x:=y) ` z = if(z=x, y, f`z)
paulson@5160
  1150
  may also be iterated as in f(a:=b,c:=d,...);
paulson@5160
  1151
paulson@4879
  1152
* in  let x=t in u(x), neither t nor u(x) has to be an FOL term.
oheimb@4649
  1153
paulson@5142
  1154
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
  1155
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
  1156
  Now rew can involve either definitions or equalities (either == or =).
paulson@5142
  1157
paulson@5160
  1158
* case_tac provided for compatibility with HOL
paulson@5160
  1159
    (like the old excluded_middle_tac, but with subgoals swapped)
paulson@5160
  1160
wenzelm@4842
  1161
wenzelm@5127
  1162
*** Internal programming interfaces ***
wenzelm@5002
  1163
wenzelm@5251
  1164
* Pure: several new basic modules made available for general use, see
wenzelm@5251
  1165
also src/Pure/README;
wenzelm@5207
  1166
wenzelm@5008
  1167
* improved the theory data mechanism to support encapsulation (data
wenzelm@5008
  1168
kind name replaced by private Object.kind, acting as authorization
wenzelm@5373
  1169
key); new type-safe user interface via functor TheoryDataFun; generic
wenzelm@5373
  1170
print_data function becomes basically useless;
wenzelm@5002
  1171
wenzelm@5251
  1172
* removed global_names compatibility flag -- all theory declarations
wenzelm@5251
  1173
are qualified by default;
wenzelm@5251
  1174
wenzelm@5085
  1175
* module Pure/Syntax now offers quote / antiquote translation
wenzelm@5085
  1176
functions (useful for Hoare logic etc. with implicit dependencies);
wenzelm@5373
  1177
see HOL/ex/Antiquote for an example use;
wenzelm@5085
  1178
wenzelm@5127
  1179
* Simplifier now offers conversions (asm_)(full_)rewrite: simpset ->
wenzelm@5127
  1180
cterm -> thm;
wenzelm@5127
  1181
wenzelm@5207
  1182
* new tactical CHANGED_GOAL for checking that a tactic modifies a
wenzelm@5207
  1183
subgoal;
paulson@5142
  1184
wenzelm@5251
  1185
* Display.print_goals function moved to Locale.print_goals;
wenzelm@5251
  1186
wenzelm@5731
  1187
* standard print function for goals supports current_goals_markers
wenzelm@5731
  1188
variable for marking begin of proof, end of proof, start of goal; the
wenzelm@5731
  1189
default is ("", "", ""); setting current_goals_markers := ("<proof>",
wenzelm@5731
  1190
"</proof>", "<goal>") causes SGML like tagged proof state printing,
wenzelm@5731
  1191
for example;
wenzelm@5731
  1192
wenzelm@5002
  1193
wenzelm@5002
  1194
wenzelm@4410
  1195
New in Isabelle98 (January 1998)
wenzelm@4410
  1196
--------------------------------
wenzelm@4410
  1197
wenzelm@4410
  1198
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4410
  1199
wenzelm@4410
  1200
* changed lexical syntax of terms / types: dots made part of long
wenzelm@4410
  1201
identifiers, e.g. "%x.x" no longer possible, should be "%x. x";
wenzelm@4410
  1202
wenzelm@4410
  1203
* simpset (and claset) reference variable replaced by functions
wenzelm@4410
  1204
simpset / simpset_ref;
wenzelm@4410
  1205
wenzelm@4410
  1206
* no longer supports theory aliases (via merge) and non-trivial
wenzelm@4410
  1207
implicit merge of thms' signatures;
wenzelm@4410
  1208
wenzelm@4410
  1209
* most internal names of constants changed due to qualified names;
wenzelm@4410
  1210
wenzelm@4410
  1211
* changed Pure/Sequence interface (see Pure/seq.ML);
wenzelm@4410
  1212
wenzelm@3454
  1213
paulson@3715
  1214
*** General Changes ***
paulson@3715
  1215
wenzelm@4174
  1216
* hierachically structured name spaces (for consts, types, axms, thms
wenzelm@3943
  1217
etc.); new lexical class 'longid' (e.g. Foo.bar.x) may render much of
wenzelm@4108
  1218
old input syntactically incorrect (e.g. "%x.x"); COMPATIBILITY:
wenzelm@4108
  1219
isatool fixdots ensures space after dots (e.g. "%x. x"); set
wenzelm@4174
  1220
long_names for fully qualified output names; NOTE: ML programs
wenzelm@4174
  1221
(special tactics, packages etc.) referring to internal names may have
wenzelm@4174
  1222
to be adapted to cope with fully qualified names; in case of severe
wenzelm@4174
  1223
backward campatibility problems try setting 'global_names' at compile
wenzelm@4174
  1224
time to have enrything declared within a flat name space; one may also
wenzelm@4174
  1225
fine tune name declarations in theories via the 'global' and 'local'
wenzelm@4174
  1226
section;
wenzelm@4108
  1227
wenzelm@4108
  1228
* reimplemented the implicit simpset and claset using the new anytype
wenzelm@4108
  1229
data filed in signatures; references simpset:simpset ref etc. are
wenzelm@4108
  1230
replaced by functions simpset:unit->simpset and
wenzelm@4108
  1231
simpset_ref:unit->simpset ref; COMPATIBILITY: use isatool fixclasimp
wenzelm@4108
  1232
to patch your ML files accordingly;
paulson@3856
  1233
wenzelm@3857
  1234
* HTML output now includes theory graph data for display with Java
wenzelm@3857
  1235
applet or isatool browser; data generated automatically via isatool
wenzelm@3901
  1236
usedir (see -i option, ISABELLE_USEDIR_OPTIONS);
wenzelm@3857
  1237
paulson@3856
  1238
* defs may now be conditional; improved rewrite_goals_tac to handle
paulson@3856
  1239
conditional equations;
paulson@3856
  1240
wenzelm@4174
  1241
* defs now admits additional type arguments, using TYPE('a) syntax;
wenzelm@4174
  1242
wenzelm@3901
  1243
* theory aliases via merge (e.g. M=A+B+C) no longer supported, always
wenzelm@3901
  1244
creates a new theory node; implicit merge of thms' signatures is
wenzelm@4112
  1245
restricted to 'trivial' ones; COMPATIBILITY: one may have to use
wenzelm@3901
  1246
transfer:theory->thm->thm in (rare) cases;
wenzelm@3901
  1247
wenzelm@3968
  1248
* improved handling of draft signatures / theories; draft thms (and
wenzelm@3968
  1249
ctyps, cterms) are automatically promoted to real ones;
wenzelm@3968
  1250
wenzelm@3901
  1251
* slightly changed interfaces for oracles: admit many per theory, named
wenzelm@3901
  1252
(e.g. oracle foo = mlfun), additional name argument for invoke_oracle;
wenzelm@3901
  1253
wenzelm@3901
  1254
* print_goals: optional output of const types (set show_consts and
wenzelm@3901
  1255
show_types);
wenzelm@3851
  1256
wenzelm@4388
  1257
* improved output of warnings (###) and errors (***);
wenzelm@3697
  1258
paulson@4178
  1259
* subgoal_tac displays a warning if the new subgoal has type variables;
paulson@4178
  1260
paulson@3715
  1261
* removed old README and Makefiles;
wenzelm@3697
  1262
paulson@3856
  1263
* replaced print_goals_ref hook by print_current_goals_fn and result_error_fn;
wenzelm@3670
  1264
paulson@3715
  1265
* removed obsolete init_pps and init_database;
paulson@3715
  1266
paulson@3715
  1267
* deleted the obsolete tactical STATE, which was declared by
paulson@3715
  1268
    fun STATE tacfun st = tacfun st st;
paulson@3715
  1269
wenzelm@4388
  1270
* cd and use now support path variables, e.g. $ISABELLE_HOME, or ~
wenzelm@4388
  1271
(which abbreviates $HOME);
wenzelm@4269
  1272
wenzelm@4269
  1273
* changed Pure/Sequence interface (see Pure/seq.ML); COMPATIBILITY:
wenzelm@4269
  1274
use isatool fixseq to adapt your ML programs (this works for fully
wenzelm@4269
  1275
qualified references to the Sequence structure only!);
wenzelm@4269
  1276
wenzelm@4381
  1277
* use_thy no longer requires writable current directory; it always
wenzelm@4381
  1278
reloads .ML *and* .thy file, if either one is out of date;
wenzelm@4269
  1279
paulson@3715
  1280
paulson@3715
  1281
*** Classical Reasoner ***
paulson@3715
  1282
wenzelm@3744
  1283
* Clarify_tac, clarify_tac, clarify_step_tac, Clarify_step_tac: new
wenzelm@3744
  1284
tactics that use classical reasoning to simplify a subgoal without
wenzelm@3744
  1285
splitting it into several subgoals;
paulson@3715
  1286
paulson@3719
  1287
* Safe_tac: like safe_tac but uses the default claset;
paulson@3719
  1288
paulson@3715
  1289
paulson@3715
  1290
*** Simplifier ***
paulson@3715
  1291
paulson@3715
  1292
* added simplification meta rules:
paulson@3715
  1293
    (asm_)(full_)simplify: simpset -> thm -> thm;
paulson@3715
  1294
paulson@3715
  1295
* simplifier.ML no longer part of Pure -- has to be loaded by object
paulson@3715
  1296
logics (again);
paulson@3715
  1297
paulson@3715
  1298
* added prems argument to simplification procedures;
paulson@3715
  1299
paulson@4325
  1300
* HOL, FOL, ZF: added infix function `addsplits':
paulson@4325
  1301
  instead of `<simpset> setloop (split_tac <thms>)'
paulson@4325
  1302
  you can simply write `<simpset> addsplits <thms>'
paulson@4325
  1303
paulson@3715
  1304
paulson@3715
  1305
*** Syntax ***
paulson@3715
  1306
wenzelm@4174
  1307
* TYPE('a) syntax for type reflection terms;
wenzelm@4174
  1308
wenzelm@3985
  1309
* no longer handles consts with name "" -- declare as 'syntax' instead;
paulson@3856
  1310
paulson@3856
  1311
* pretty printer: changed order of mixfix annotation preference (again!);
wenzelm@3846
  1312
paulson@3715
  1313
* Pure: fixed idt/idts vs. pttrn/pttrns syntactic categories;
paulson@3715
  1314
paulson@3715
  1315
paulson@3715
  1316
*** HOL ***
paulson@3715
  1317
wenzelm@5726
  1318
* HOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  1319
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
  1320
nipkow@4035
  1321
* HOL/TLA: Stephan Merz's formalization of Lamport's Temporal Logic of Actions;
wenzelm@3985
  1322
wenzelm@3985
  1323
* HOL/Auth: new protocol proofs including some for the Internet
nipkow@4035
  1324
  protocol TLS;
wenzelm@3985
  1325
wenzelm@4125
  1326
* HOL/Map: new theory of `maps' a la VDM;
nipkow@3982
  1327
wenzelm@4335
  1328
* HOL/simplifier: simplification procedures nat_cancel_sums for
wenzelm@4335
  1329
cancelling out common nat summands from =, <, <= (in)equalities, or
wenzelm@4335
  1330
differences; simplification procedures nat_cancel_factor for
wenzelm@4335
  1331
cancelling common factor from =, <, <= (in)equalities over natural
wenzelm@4373
  1332
sums; nat_cancel contains both kinds of procedures, it is installed by
wenzelm@4373
  1333
default in Arith.thy -- this COULD MAKE EXISTING PROOFS FAIL;
wenzelm@4335
  1334
nipkow@3580
  1335
* HOL/simplifier: terms of the form
paulson@4325
  1336
  `? x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x)'  (or t=x)
nipkow@3580
  1337
  are rewritten to
nipkow@4035
  1338
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t)',
nipkow@4035
  1339
  and those of the form
paulson@4325
  1340
  `! x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x) --> R(x)'  (or t=x)
nipkow@4035
  1341
  are rewritten to
nipkow@4035
  1342
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t) --> R(t)',
nipkow@4035
  1343
nipkow@4035
  1344
* HOL/datatype
nipkow@4035
  1345
  Each datatype `t' now comes with a theorem `split_t_case' of the form
nipkow@3580
  1346
nipkow@4035
  1347
  P(t_case f1 ... fn x) =
nipkow@4035
  1348
     ( (!y1 ... ym1. x = C1 y1 ... ym1 --> P(f1 y1 ... ym1)) &
nipkow@4035
  1349
        ...
oheimb@4189
  1350
       (!y1 ... ymn. x = Cn y1 ... ymn --> P(f1 y1 ... ymn))
nipkow@4035
  1351
     )
nipkow@4035
  1352
oheimb@4930
  1353
  and a theorem `split_t_case_asm' of the form
oheimb@4189
  1354
oheimb@4189
  1355
  P(t_case f1 ... fn x) =
oheimb@4189
  1356
    ~( (? y1 ... ym1. x = C1 y1 ... ym1 & ~P(f1 y1 ... ym1)) |
oheimb@4189
  1357
        ...
oheimb@4189
  1358
       (? y1 ... ymn. x = Cn y1 ... ymn & ~P(f1 y1 ... ymn))
oheimb@4189
  1359
     )
oheimb@4930
  1360
  which can be added to a simpset via `addsplits'. The existing theorems
oheimb@4930
  1361
  expand_list_case and expand_option_case have been renamed to
oheimb@4930
  1362
  split_list_case and split_option_case.
oheimb@4189
  1363
nipkow@4361
  1364
* HOL/Arithmetic:
nipkow@4361
  1365
  - `pred n' is automatically converted to `n-1'.
nipkow@4361
  1366
    Users are strongly encouraged not to use `pred' any longer,
nipkow@4361
  1367
    because it will disappear altogether at some point.
nipkow@4361
  1368
  - Users are strongly encouraged to write "0 < n" rather than
nipkow@4361
  1369
    "n ~= 0". Theorems and proof tools have been modified towards this
nipkow@4361
  1370
    `standard'.
nipkow@4357
  1371
nipkow@4502
  1372
* HOL/Lists:
nipkow@4502
  1373
  the function "set_of_list" has been renamed "set" (and its theorems too);
nipkow@4502
  1374
  the function "nth" now takes its arguments in the reverse order and
nipkow@4502
  1375
  has acquired the infix notation "!" as in "xs!n".
paulson@3570
  1376
paulson@4154
  1377
* HOL/Set: UNIV is now a constant and is no longer translated to Compl{};
paulson@4154
  1378
paulson@4154
  1379
* HOL/Set: The operator (UN x.B x) now abbreviates (UN x:UNIV. B x) and its
paulson@4154
  1380
  specialist theorems (like UN1_I) are gone.  Similarly for (INT x.B x);
paulson@4154
  1381
wenzelm@4575
  1382
* HOL/record: extensible records with schematic structural subtyping
wenzelm@4575
  1383
(single inheritance); EXPERIMENTAL version demonstrating the encoding,
wenzelm@4575
  1384
still lacks various theorems and concrete record syntax;
wenzelm@4575
  1385
wenzelm@4125
  1386
paulson@3715
  1387
*** HOLCF ***
wenzelm@3535
  1388
wenzelm@4125
  1389
* removed "axioms" and "generated by" sections;
wenzelm@4125
  1390
oheimb@4123
  1391
* replaced "ops" section by extended "consts" section, which is capable of
wenzelm@4125
  1392
  handling the continuous function space "->" directly;
wenzelm@4125
  1393
wenzelm@4125
  1394
* domain package:
wenzelm@4125
  1395
  . proves theorems immediately and stores them in the theory,
wenzelm@4125
  1396
  . creates hierachical name space,
wenzelm@4125
  1397
  . now uses normal mixfix annotations (instead of cinfix...),
wenzelm@4125
  1398
  . minor changes to some names and values (for consistency),
wenzelm@4125
  1399
  . e.g. cases -> casedist, dists_eq -> dist_eqs, [take_lemma] -> take_lemmas,
wenzelm@4125
  1400
  . separator between mutual domain defs: changed "," to "and",
wenzelm@4125
  1401
  . improved handling of sort constraints;  now they have to
wenzelm@4125
  1402
    appear on the left-hand side of the equations only;
oheimb@4123
  1403
oheimb@4123
  1404
* fixed LAM <x,y,zs>.b syntax;
wenzelm@3567
  1405
wenzelm@3744
  1406
* added extended adm_tac to simplifier in HOLCF -- can now discharge
wenzelm@3744
  1407
adm (%x. P (t x)), where P is chainfinite and t continuous;
wenzelm@3579
  1408
wenzelm@3579
  1409
paulson@3719
  1410
*** FOL and ZF ***
paulson@3719
  1411
wenzelm@5726
  1412
* FOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  1413
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
  1414
wenzelm@3744
  1415
* qed_spec_mp, qed_goal_spec_mp, qed_goalw_spec_mp are available, as
wenzelm@3744
  1416
in HOL, they strip ALL and --> from proved theorems;
wenzelm@3744
  1417
paulson@3719
  1418
wenzelm@3579
  1419
wenzelm@3006
  1420
New in Isabelle94-8 (May 1997)
wenzelm@3006
  1421
------------------------------
wenzelm@2654
  1422
paulson@3002
  1423
*** General Changes ***
paulson@3002
  1424
paulson@3002
  1425
* new utilities to build / run / maintain Isabelle etc. (in parts
paulson@3002
  1426
still somewhat experimental); old Makefiles etc. still functional;
wenzelm@2971
  1427
wenzelm@3205
  1428
* new 'Isabelle System Manual';
wenzelm@3205
  1429
wenzelm@2825
  1430
* INSTALL text, together with ./configure and ./build scripts;
wenzelm@2773
  1431
wenzelm@3006
  1432
* reimplemented type inference for greater efficiency, better error
wenzelm@3006
  1433
messages and clean internal interface;
paulson@3002
  1434
paulson@3002
  1435
* prlim command for dealing with lots of subgoals (an easier way of
paulson@3002
  1436
setting goals_limit);
paulson@3002
  1437
wenzelm@3006
  1438
wenzelm@3006
  1439
*** Syntax ***
paulson@3002
  1440
wenzelm@3116
  1441
* supports alternative (named) syntax tables (parser and pretty
wenzelm@3116
  1442
printer); internal interface is provided by add_modesyntax(_i);
wenzelm@3116
  1443
paulson@3002
  1444
* Pure, FOL, ZF, HOL, HOLCF now support symbolic input and output; to
paulson@3002
  1445
be used in conjunction with the Isabelle symbol font; uses the
paulson@3002
  1446
"symbols" syntax table;
paulson@3002
  1447
wenzelm@2705
  1448
* added token_translation interface (may translate name tokens in
wenzelm@2756
  1449
arbitrary ways, dependent on their type (free, bound, tfree, ...) and
wenzelm@3116
  1450
the current print_mode); IMPORTANT: user print translation functions
wenzelm@3116
  1451
are responsible for marking newly introduced bounds
wenzelm@3116
  1452
(Syntax.mark_boundT);
wenzelm@2705
  1453
wenzelm@2730
  1454
* token translations for modes "xterm" and "xterm_color" that display
wenzelm@3006
  1455
names in bold, underline etc. or colors (which requires a color
wenzelm@3006
  1456
version of xterm);
wenzelm@2730
  1457
paulson@3002
  1458
* infixes may now be declared with names independent of their syntax;
paulson@3002
  1459
paulson@3002
  1460
* added typed_print_translation (like print_translation, but may
paulson@3002
  1461
access type of constant);
paulson@3002
  1462
wenzelm@3006
  1463
paulson@3002
  1464
*** Classical Reasoner ***
paulson@3002
  1465
paulson@3002
  1466
Blast_tac: a new tactic!  It is often more powerful than fast_tac, but has
paulson@3002
  1467
some limitations.  Blast_tac...
paulson@3002
  1468
  + ignores addss, addbefore, addafter; this restriction is intrinsic
paulson@3002
  1469
  + ignores elimination rules that don't have the correct format
wenzelm@5726
  1470
        (the conclusion MUST be a formula variable)
paulson@3002
  1471
  + ignores types, which can make HOL proofs fail
paulson@3002
  1472
  + rules must not require higher-order unification, e.g. apply_type in ZF
paulson@3002
  1473
    [message "Function Var's argument not a bound variable" relates to this]
paulson@3002
  1474
  + its proof strategy is more general but can actually be slower
paulson@3002
  1475
wenzelm@3107
  1476
* substitution with equality assumptions no longer permutes other
wenzelm@3107
  1477
assumptions;
paulson@3002
  1478
paulson@3002
  1479
* minor changes in semantics of addafter (now called addaltern); renamed
paulson@3002
  1480
setwrapper to setWrapper and compwrapper to compWrapper; added safe wrapper
wenzelm@3107
  1481
(and access functions for it);
paulson@3002
  1482
wenzelm@5726
  1483
* improved combination of classical reasoner and simplifier:
oheimb@3317
  1484
  + functions for handling clasimpsets
oheimb@3317
  1485
  + improvement of addss: now the simplifier is called _after_ the
oheimb@3317
  1486
    safe steps.
oheimb@3317
  1487
  + safe variant of addss called addSss: uses safe simplifications
wenzelm@5726
  1488
    _during_ the safe steps. It is more complete as it allows multiple
oheimb@3317
  1489
    instantiations of unknowns (e.g. with slow_tac).
wenzelm@3006
  1490
paulson@3002
  1491
*** Simplifier ***
paulson@3002
  1492
wenzelm@3006
  1493
* added interface for simplification procedures (functions that
wenzelm@3006
  1494
produce *proven* rewrite rules on the fly, depending on current
wenzelm@3006
  1495
redex);
wenzelm@3006
  1496
wenzelm@3006
  1497
* ordering on terms as parameter (used for ordered rewriting);
wenzelm@3006
  1498
wenzelm@3107
  1499
* new functions delcongs, deleqcongs, and Delcongs. richer rep_ss;
paulson@3002
  1500
paulson@3002
  1501
* the solver is now split into a safe and an unsafe part.
paulson@3002
  1502
This should be invisible for the normal user, except that the
paulson@3002
  1503
functions setsolver and addsolver have been renamed to setSolver and
wenzelm@3107
  1504
addSolver; added safe_asm_full_simp_tac;
paulson@3002
  1505
paulson@3002
  1506
paulson@3002
  1507
*** HOL ***
paulson@3002
  1508
nipkow@3042
  1509
* a generic induction tactic `induct_tac' which works for all datatypes and
wenzelm@3107
  1510
also for type `nat';
nipkow@3042
  1511
nipkow@3316
  1512
* a generic case distinction tactic `exhaust_tac' which works for all
nipkow@3316
  1513
datatypes and also for type `nat';
nipkow@3316
  1514
nipkow@3316
  1515
* each datatype comes with a function `size';
nipkow@3316
  1516
paulson@3002
  1517
* patterns in case expressions allow tuple patterns as arguments to
wenzelm@3107
  1518
constructors, for example `case x of [] => ... | (x,y,z)#ps => ...';
paulson@3002
  1519
paulson@3002
  1520
* primrec now also works with type nat;
paulson@3002
  1521
paulson@3338
  1522
* recdef: a new declaration form, allows general recursive functions to be
paulson@3338
  1523
defined in theory files.  See HOL/ex/Fib, HOL/ex/Primes, HOL/Subst/Unify.
paulson@3338
  1524
paulson@3002
  1525
* the constant for negation has been renamed from "not" to "Not" to
wenzelm@3107
  1526
harmonize with FOL, ZF, LK, etc.;
paulson@3002
  1527
wenzelm@3107
  1528
* HOL/ex/LFilter theory of a corecursive "filter" functional for
wenzelm@3107
  1529
infinite lists;
paulson@3002
  1530
wenzelm@3227
  1531
* HOL/Modelcheck demonstrates invocation of model checker oracle;
wenzelm@3227
  1532
paulson@3002
  1533
* HOL/ex/Ring.thy declares cring_simp, which solves equational
paulson@3002
  1534
problems in commutative rings, using axiomatic type classes for + and *;
paulson@3002
  1535
paulson@3002
  1536
* more examples in HOL/MiniML and HOL/Auth;
paulson@3002
  1537
paulson@3002
  1538
* more default rewrite rules for quantifiers, union/intersection;
paulson@3002
  1539
nipkow@3321
  1540
* a new constant `arbitrary == @x.False';
nipkow@3321
  1541
wenzelm@3107
  1542
* HOLCF/IOA replaces old HOL/IOA;
wenzelm@3107
  1543
wenzelm@5726
  1544
* HOLCF changes: derived all rules and arities
wenzelm@5726
  1545
  + axiomatic type classes instead of classes
slotosch@2653
  1546
  + typedef instead of faking type definitions
paulson@2747
  1547
  + eliminated the internal constants less_fun, less_cfun, UU_fun, UU_cfun etc.
wenzelm@2730
  1548
  + new axclasses cpo, chfin, flat with flat < chfin < pcpo < cpo < po
slotosch@2653
  1549
  + eliminated the types void, one, tr
slotosch@2653
  1550
  + use unit lift and bool lift (with translations) instead of one and tr
slotosch@2653
  1551
  + eliminated blift from Lift3.thy (use Def instead of blift)
wenzelm@3107
  1552
  all eliminated rules are derived as theorems --> no visible changes ;
oheimb@2649
  1553
wenzelm@3006
  1554
paulson@3002
  1555
*** ZF ***
wenzelm@2553
  1556
paulson@2865
  1557
* ZF now has Fast_tac, Simp_tac and Auto_tac.  Union_iff is a now a default
paulson@2865
  1558
rewrite rule; this may affect some proofs.  eq_cs is gone but can be put back
paulson@2865
  1559
as ZF_cs addSIs [equalityI];
wenzelm@2553
  1560
wenzelm@2554
  1561
wenzelm@2732
  1562
wenzelm@2553
  1563
New in Isabelle94-7 (November 96)
wenzelm@2553
  1564
---------------------------------
wenzelm@2553
  1565
wenzelm@2553
  1566
* allowing negative levels (as offsets) in prlev and choplev;
wenzelm@2553
  1567
wenzelm@2554
  1568
* super-linear speedup for large simplifications;
wenzelm@2554
  1569
wenzelm@2554
  1570
* FOL, ZF and HOL now use miniscoping: rewriting pushes
wenzelm@2554
  1571
quantifications in as far as possible (COULD MAKE EXISTING PROOFS
wenzelm@2554
  1572
FAIL); can suppress it using the command Delsimps (ex_simps @
wenzelm@2554
  1573
all_simps); De Morgan laws are also now included, by default;
wenzelm@2554
  1574
wenzelm@2554
  1575
* improved printing of ==>  :  ~:
wenzelm@2554
  1576
wenzelm@2554
  1577
* new object-logic "Sequents" adds linear logic, while replacing LK
wenzelm@2554
  1578
and Modal (thanks to Sara Kalvala);
wenzelm@2554
  1579
wenzelm@2554
  1580
* HOL/Auth: correctness proofs for authentication protocols;
wenzelm@2554
  1581
wenzelm@2554
  1582
* HOL: new auto_tac combines rewriting and classical reasoning (many
wenzelm@2554
  1583
examples on HOL/Auth);
wenzelm@2554
  1584
wenzelm@2554
  1585
* HOL: new command AddIffs for declaring theorems of the form P=Q to
wenzelm@2554
  1586
the rewriter and classical reasoner simultaneously;
wenzelm@2554
  1587
wenzelm@2554
  1588
* function uresult no longer returns theorems in "standard" format;
wenzelm@2554
  1589
regain previous version by: val uresult = standard o uresult;
wenzelm@2554
  1590
wenzelm@2554
  1591
wenzelm@2554
  1592
wenzelm@2554
  1593
New in Isabelle94-6
wenzelm@2554
  1594
-------------------
wenzelm@2554
  1595
wenzelm@2554
  1596
* oracles -- these establish an interface between Isabelle and trusted
wenzelm@2554
  1597
external reasoners, which may deliver results as theorems;
wenzelm@2554
  1598
wenzelm@2554
  1599
* proof objects (in particular record all uses of oracles);
wenzelm@2554
  1600
wenzelm@2554
  1601
* Simp_tac, Fast_tac, etc. that refer to implicit simpset / claset;
wenzelm@2554
  1602
wenzelm@2554
  1603
* "constdefs" section in theory files;
wenzelm@2554
  1604
wenzelm@2554
  1605
* "primrec" section (HOL) no longer requires names;
wenzelm@2554
  1606
wenzelm@2554
  1607
* internal type "tactic" now simply "thm -> thm Sequence.seq";
wenzelm@2554
  1608
wenzelm@2554
  1609
wenzelm@2554
  1610
wenzelm@2554
  1611
New in Isabelle94-5
wenzelm@2554
  1612
-------------------
wenzelm@2554
  1613
wenzelm@2554
  1614
* reduced space requirements;
wenzelm@2554
  1615
wenzelm@2554
  1616
* automatic HTML generation from theories;
wenzelm@2554
  1617
wenzelm@2554
  1618
* theory files no longer require "..." (quotes) around most types;
wenzelm@2554
  1619
wenzelm@2554
  1620
* new examples, including two proofs of the Church-Rosser theorem;
wenzelm@2554
  1621
wenzelm@2554
  1622
* non-curried (1994) version of HOL is no longer distributed;
wenzelm@2554
  1623
wenzelm@2553
  1624
paulson@2557
  1625
paulson@2557
  1626
New in Isabelle94-4
paulson@2557
  1627
-------------------
paulson@2557
  1628
paulson@2747
  1629
* greatly reduced space requirements;
paulson@2557
  1630
paulson@2557
  1631
* theory files (.thy) no longer require \...\ escapes at line breaks;
paulson@2557
  1632
wenzelm@5726
  1633
* searchable theorem database (see the section "Retrieving theorems" on
paulson@2557
  1634
page 8 of the Reference Manual);
paulson@2557
  1635
paulson@2557
  1636
* new examples, including Grabczewski's monumental case study of the
paulson@2557
  1637
Axiom of Choice;
paulson@2557
  1638
paulson@2557
  1639
* The previous version of HOL renamed to Old_HOL;
paulson@2557
  1640
wenzelm@5726
  1641
* The new version of HOL (previously called CHOL) uses a curried syntax
paulson@2557
  1642
for functions.  Application looks like f a b instead of f(a,b);
paulson@2557
  1643
paulson@2557
  1644
* Mutually recursive inductive definitions finally work in HOL;
paulson@2557
  1645
paulson@2557
  1646
* In ZF, pattern-matching on tuples is now available in all abstractions and
paulson@2557
  1647
translates to the operator "split";
paulson@2557
  1648
paulson@2557
  1649
paulson@2557
  1650
paulson@2557
  1651
New in Isabelle94-3
paulson@2557
  1652
-------------------
paulson@2557
  1653
wenzelm@5726
  1654
* new infix operator, addss, allowing the classical reasoner to
paulson@2557
  1655
perform simplification at each step of its search.  Example:
wenzelm@5726
  1656
        fast_tac (cs addss ss)
paulson@2557
  1657
wenzelm@5726
  1658
* a new logic, CHOL, the same as HOL, but with a curried syntax
wenzelm@5726
  1659
for functions.  Application looks like f a b instead of f(a,b).  Also pairs
paulson@2557
  1660
look like (a,b) instead of <a,b>;
paulson@2557
  1661
paulson@2557
  1662
* PLEASE NOTE: CHOL will eventually replace HOL!
paulson@2557
  1663
paulson@2557
  1664
* In CHOL, pattern-matching on tuples is now available in all abstractions.
paulson@2557
  1665
It translates to the operator "split".  A new theory of integers is available;
paulson@2557
  1666
paulson@2557
  1667
* In ZF, integer numerals now denote two's-complement binary integers.
paulson@2557
  1668
Arithmetic operations can be performed by rewriting.  See ZF/ex/Bin.ML;
paulson@2557
  1669
wenzelm@5726
  1670
* Many new examples: I/O automata, Church-Rosser theorem, equivalents
paulson@2557
  1671
of the Axiom of Choice;
paulson@2557
  1672
paulson@2557
  1673
paulson@2557
  1674
paulson@2557
  1675
New in Isabelle94-2
paulson@2557
  1676
-------------------
paulson@2557
  1677
wenzelm@5726
  1678
* Significantly faster resolution;
paulson@2557
  1679
paulson@2557
  1680
* the different sections in a .thy file can now be mixed and repeated
paulson@2557
  1681
freely;
paulson@2557
  1682
paulson@2557
  1683
* Database of theorems for FOL, HOL and ZF.  New
paulson@2557
  1684
commands including qed, qed_goal and bind_thm store theorems in the database.
paulson@2557
  1685
paulson@2557
  1686
* Simple database queries: return a named theorem (get_thm) or all theorems of
paulson@2557
  1687
a given theory (thms_of), or find out what theory a theorem was proved in
paulson@2557
  1688
(theory_of_thm);
paulson@2557
  1689
paulson@2557
  1690
* Bugs fixed in the inductive definition and datatype packages;
paulson@2557
  1691
paulson@2557
  1692
* The classical reasoner provides deepen_tac and depth_tac, making FOL_dup_cs
paulson@2557
  1693
and HOL_dup_cs obsolete;
paulson@2557
  1694
paulson@2557
  1695
* Syntactic ambiguities caused by the new treatment of syntax in Isabelle94-1
paulson@2557
  1696
have been removed;
paulson@2557
  1697
paulson@2557
  1698
* Simpler definition of function space in ZF;
paulson@2557
  1699
paulson@2557
  1700
* new results about cardinal and ordinal arithmetic in ZF;
paulson@2557
  1701
paulson@2557
  1702
* 'subtype' facility in HOL for introducing new types as subsets of existing
paulson@2557
  1703
types;
paulson@2557
  1704
paulson@2557
  1705
wenzelm@2553
  1706
$Id$