NEWS
author wenzelm
Thu Oct 04 16:07:43 2001 +0200 (2001-10-04)
changeset 11690 cb64368fb405
parent 11663 8a86409108fe
child 11700 a0e6bda62b7b
permissions -rw-r--r--
improved proof by cases and induction;
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Isabelle NEWS -- history user-relevant changes
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==============================================
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New in Isabelle2001 (?? 2001)
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-----------------------------
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*** Document preparation ***
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* support bold style (for single symbols only), input syntax is like
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this: "\<^bold>\<alpha>" or "\<^bold>A";
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* \<bullet> is no output as bold \cdot by default, which looks much
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better in printed text;
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*** Isar ***
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* renamed "antecedent" case to "rule_context";
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* improved proof by cases and induction:
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  - moved induct/cases attributes to Pure;
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  - added 'print_induct_rules' (covered by help item in Proof General > 3.3);
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  - generic setup instantiated for FOL and HOL;
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  - removed obsolete "(simplified)" and "(stripped)" options;
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* HOL: 'recdef' now fails on unfinished automated proofs, use
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"(permissive)" option to recover old behavior;
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* HOL: 'inductive' now longer features separate (collective)
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attributes for 'intros';
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*** HOL ***
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* HOL: linorder_less_split superseded by linorder_cases;
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* HOL: added "The" definite description operator; move Hilbert's "Eps"
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to peripheral theory "Hilbert_Choice";
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* HOL: made split_all_tac safe; EXISTING PROOFS MAY FAIL OR LOOP, so
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in this (rare) case use:
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  delSWrapper "split_all_tac"
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  addSbefore ("unsafe_split_all_tac", unsafe_split_all_tac)
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* HOL: added safe wrapper "split_conv_tac" to claset; EXISTING PROOFS
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MAY FAIL;
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* HOL: introduced f^n = f o ... o f; warning: due to the limits of
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Isabelle's type classes, ^ on functions and relations has too general
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a domain, namely ('a * 'b) set and 'a => 'b; this means that it may be
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necessary to attach explicit type constraints;
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* HOL: syntax translations now work properly with numerals and records
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expressions;
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* HOL/GroupTheory: group theory examples including Sylow's theorem, by
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Florian Kammüller;
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* HOL: eliminated global items
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  const "()" -> "Product_Type.Unity"
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  type "unit" -> "Product_Type.unit"
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*** ZF ***
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* ZF: the integer library now covers quotients and remainders, with
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many laws relating division to addition, multiplication, etc.;
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*** General ***
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* Meta-level proof terms (by Stefan Berghofer), see also ref manual;
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* Classical reasoner: renamed addaltern to addafter, addSaltern to
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addSafter;
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* syntax: support non-oriented infixes;
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* print modes "type_brackets" and "no_type_brackets" control output of
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nested => (types); the default behavior is "brackets";
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* system: support Poly/ML 4.1.1 (now able to manage large heaps);
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* system: Proof General keywords specification is now part of the
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Isabelle distribution (see etc/isar-keywords.el);
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* system: smart selection of Isabelle process versus Isabelle
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interface, accommodates case-insensitive file systems (e.g. HFS+); may
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run both "isabelle" and "Isabelle" even if file names are badly
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damaged (executable inspects the case of the first letter of its own
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name); added separate "isabelle-process" and "isabelle-interface";
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New in Isabelle99-2 (February 2001)
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-----------------------------------
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*** Overview of INCOMPATIBILITIES ***
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* HOL: please note that theories in the Library and elsewhere often use the
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new-style (Isar) format; to refer to their theorems in an ML script you must
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bind them to ML identifers by e.g.	val thm_name = thm "thm_name";
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* HOL: inductive package no longer splits induction rule aggressively,
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but only as far as specified by the introductions given; the old
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format may be recovered via ML function complete_split_rule or attribute
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'split_rule (complete)';
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* HOL: induct renamed to lfp_induct, lfp_Tarski to lfp_unfold,
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gfp_Tarski to gfp_unfold;
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* HOL: contrapos, contrapos2 renamed to contrapos_nn, contrapos_pp;
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* HOL: infix "dvd" now has priority 50 rather than 70 (because it is a
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relation); infix "^^" has been renamed "``"; infix "``" has been
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renamed "`"; "univalent" has been renamed "single_valued";
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* HOL/Real: "rinv" and "hrinv" replaced by overloaded "inverse"
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operation;
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* HOLCF: infix "`" has been renamed "$"; the symbol syntax is \<cdot>;
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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: renamed standard symbols \<ll> to \<lless> and
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\<gg> to \<ggreater>;
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*** Document preparation ***
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* \isabellestyle{NAME} selects version of Isabelle output (currently
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available: are "it" for near math-mode best-style output, "sl" for
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slanted text style, and "tt" for plain type-writer; if no
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\isabellestyle command is given, output is according to slanted
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type-writer);
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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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* some more standard symbols; see Appendix A of the system manual for
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the complete list of symbols defined in isabellesym.sty;
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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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* 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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* proper indentation of antiquoted output with proportional LaTeX
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fonts;
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* no_document ML operator temporarily disables LaTeX document
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generation;
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* isatool unsymbolize tunes sources for plain ASCII communication;
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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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* Pure: more robust selection of calculational rules;
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* Pure: the builtin notion of 'finished' goal now includes the ==-refl
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rule (as well as the assumption rule);
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* Pure: 'thm_deps' command visualizes dependencies of theorems and
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lemmas, using the graph browser tool;
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* Pure: predict failure of "show" in interactive mode;
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* Pure: 'thms_containing' now takes actual terms as arguments;
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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: local contexts (aka cases) may now contain term bindings as
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well; the 'cases' and 'induct' methods new provide a ?case binding for
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the result to be shown in each case;
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* HOL: added 'recdef_tc' command;
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* isatool convert assists in eliminating legacy ML scripts;
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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/Unix: "Some aspects of Unix file-system security", a typical
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modelling and verification task performed in Isabelle/HOL +
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Isabelle/Isar + Isabelle document preparation (by Markus Wenzel).
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* HOL/Algebra: special summation operator SUM no longer exists, it has
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been replaced by setsum; infix 'assoc' now has priority 50 (like
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'dvd'); axiom 'one_not_zero' has been moved from axclass 'ring' to
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'domain', this makes the theory consistent with mathematical
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literature;
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* HOL basics: added overloaded operations "inverse" and "divide"
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(infix "/"), syntax for generic "abs" operation, generic summation
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operator \<Sum>;
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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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* HOL/datatype: induction rule for arbitrarily branching datatypes is
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now expressed as a proper nested rule (old-style tactic scripts may
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require atomize_strip_tac to cope with non-atomic premises);
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* HOL: renamed theory "Prod" to "Product_Type", renamed "split" rule
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to "split_conv" (old name still available for compatibility);
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* HOL: improved concrete syntax for strings (e.g. allows translation
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rules with string literals);
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* HOL-Hyperreal: a new target, extending HOL-Real with the hyperreals
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and Fleuriot's mechanization of analysis;
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* HOL/Real, HOL/Hyperreal: improved arithmetic simplification;
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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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* 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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* 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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* Provers: fast_tac (and friends) now handle actual object-logic rules
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as assumptions as well;
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* system: support Poly/ML 4.0;
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* system: isatool install handles KDE version 1 or 2;
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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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   364
should have to change intro!! to intro? only); replaced "delrule" by
wenzelm@9937
   365
"rule del";
wenzelm@9437
   366
wenzelm@9612
   367
* Isar/HOL: renamed "intrs" to "intros" in inductive definitions;
wenzelm@9612
   368
wenzelm@9437
   369
* Provers: strengthened force_tac by using new first_best_tac;
oheimb@9402
   370
wenzelm@10003
   371
* LaTeX document preparation: several changes of isabelle.sty (see
wenzelm@10003
   372
lib/texinputs);
wenzelm@8729
   373
paulson@8014
   374
wenzelm@8487
   375
*** Document preparation ***
wenzelm@8358
   376
wenzelm@9198
   377
* formal comments (text blocks etc.) in new-style theories may now
wenzelm@9753
   378
contain antiquotations of thm/prop/term/typ/text to be presented
wenzelm@9753
   379
according to latex print mode; concrete syntax is like this:
wenzelm@9753
   380
@{term[show_types] "f(x) = a + x"};
wenzelm@9198
   381
wenzelm@8358
   382
* isatool mkdir provides easy setup of Isabelle session directories,
wenzelm@8518
   383
including proper document sources;
wenzelm@8358
   384
wenzelm@8358
   385
* generated LaTeX sources are now deleted after successful run
wenzelm@8358
   386
(isatool document -c); may retain a copy somewhere else via -D option
wenzelm@8358
   387
of isatool usedir;
wenzelm@8358
   388
wenzelm@8566
   389
* isatool usedir -D now lets isatool latex -o sty update the Isabelle
wenzelm@10003
   390
style files, achieving self-contained LaTeX sources and simplifying
wenzelm@10003
   391
LaTeX debugging;
wenzelm@8566
   392
wenzelm@8518
   393
* old-style theories now produce (crude) LaTeX output as well;
wenzelm@8358
   394
wenzelm@9057
   395
* browser info session directories are now self-contained (may be put
wenzelm@9437
   396
on WWW server seperately); improved graphs of nested sessions; removed
wenzelm@9437
   397
graph for 'all sessions';
wenzelm@9057
   398
wenzelm@10003
   399
* several improvements in isabelle style files; \isabellestyle{it}
wenzelm@10003
   400
produces fake math mode output; \isamarkupheader is now \section by
wenzelm@10003
   401
default; see lib/texinputs/isabelle.sty etc.;
wenzelm@9489
   402
wenzelm@8358
   403
wenzelm@8184
   404
*** Isar ***
wenzelm@8184
   405
wenzelm@10003
   406
* Isar/Pure: local results and corresponding term bindings are now
wenzelm@10003
   407
subject to Hindley-Milner polymorphism (similar to ML); this
wenzelm@10003
   408
accommodates incremental type-inference very nicely;
wenzelm@8283
   409
wenzelm@10003
   410
* Isar/Pure: new derived language element 'obtain' supports
wenzelm@10003
   411
generalized existence reasoning;
wenzelm@8621
   412
wenzelm@10003
   413
* Isar/Pure: new calculational elements 'moreover' and 'ultimately'
wenzelm@10003
   414
support accumulation of results, without applying any rules yet;
wenzelm@10003
   415
useful to collect intermediate results without explicit name
wenzelm@10003
   416
references, and for use with transitivity rules with more than 2
wenzelm@10003
   417
premises;
wenzelm@8184
   418
wenzelm@10003
   419
* Isar/Pure: scalable support for case-analysis type proofs: new
wenzelm@10003
   420
'case' language element refers to local contexts symbolically, as
wenzelm@10003
   421
produced by certain proof methods; internally, case names are attached
wenzelm@10003
   422
to theorems as "tags";
wenzelm@8440
   423
wenzelm@10003
   424
* Isar/Pure: theory command 'hide' removes declarations from
wenzelm@9330
   425
class/type/const name spaces;
wenzelm@9330
   426
wenzelm@10003
   427
* Isar/Pure: theory command 'defs' supports option "(overloaded)" to
wenzelm@9330
   428
indicate potential overloading;
wenzelm@9330
   429
wenzelm@10003
   430
* Isar/Pure: changed syntax of local blocks from {{ }} to { };
wenzelm@8621
   431
wenzelm@10003
   432
* Isar/Pure: syntax of sorts made 'inner', i.e. have to write
wenzelm@10003
   433
"{a,b,c}" instead of {a,b,c};
wenzelm@9011
   434
wenzelm@10003
   435
* Isar/Pure now provides its own version of intro/elim/dest
wenzelm@10003
   436
attributes; useful for building new logics, but beware of confusion
wenzelm@10003
   437
with the version in Provers/classical;
wenzelm@9612
   438
wenzelm@10003
   439
* Isar/Pure: the local context of (non-atomic) goals is provided via
wenzelm@10003
   440
case name 'antecedent';
wenzelm@8440
   441
wenzelm@10003
   442
* Isar/Pure: removed obsolete 'transfer' attribute (transfer of thms
wenzelm@10003
   443
to the current context is now done automatically);
wenzelm@9383
   444
wenzelm@10003
   445
* Isar/Pure: theory command 'method_setup' provides a simple interface
wenzelm@10003
   446
for definining proof methods in ML;
wenzelm@9612
   447
wenzelm@10003
   448
* Isar/Provers: intro/elim/dest attributes changed; renamed
wenzelm@9941
   449
intro/intro!/intro!! flags to intro!/intro/intro? (INCOMPATIBILITY, in
wenzelm@9941
   450
most cases, one should have to change intro!! to intro? only);
wenzelm@9941
   451
replaced "delrule" by "rule del";
wenzelm@8283
   452
wenzelm@10003
   453
* Isar/Provers: new 'hypsubst' method, plain 'subst' method and
wenzelm@10003
   454
'symmetric' attribute (the latter supercedes [RS sym]);
wenzelm@10003
   455
wenzelm@10003
   456
* Isar/Provers: splitter support (via 'split' attribute and 'simp'
wenzelm@10003
   457
method modifier); 'simp' method: 'only:' modifier removes loopers as
wenzelm@10003
   458
well (including splits);
wenzelm@10003
   459
wenzelm@10003
   460
* Isar/Provers: Simplifier and Classical methods now support all kind
wenzelm@10003
   461
of modifiers used in the past, including 'cong', 'iff', etc.
wenzelm@10003
   462
wenzelm@10003
   463
* Isar/Provers: added 'fastsimp' and 'clarsimp' methods (combination
wenzelm@10003
   464
of Simplifier and Classical reasoner);
wenzelm@10003
   465
wenzelm@10003
   466
* Isar/HOL: new proof method 'cases' and improved version of 'induct'
wenzelm@10003
   467
now support named cases; major packages (inductive, datatype, primrec,
wenzelm@10003
   468
recdef) support case names and properly name parameters;
wenzelm@9612
   469
wenzelm@10003
   470
* Isar/HOL: new transitivity rules for substitution in inequalities --
wenzelm@10003
   471
monotonicity conditions are extracted to be proven at end of
wenzelm@10003
   472
calculations;
wenzelm@10003
   473
wenzelm@10003
   474
* Isar/HOL: removed 'case_split' thm binding, should use 'cases' proof
wenzelm@10003
   475
method anyway;
wenzelm@10003
   476
wenzelm@10003
   477
* Isar/HOL: removed old expand_if = split_if; theorems if_splits =
wenzelm@10003
   478
split_if split_if_asm; datatype package provides theorems foo.splits =
wenzelm@10003
   479
foo.split foo.split_asm for each datatype;
wenzelm@10003
   480
wenzelm@10003
   481
* Isar/HOL: tuned inductive package, rename "intrs" to "intros"
wenzelm@10003
   482
(potential INCOMPATIBILITY), emulation of mk_cases feature for proof
wenzelm@10003
   483
scripts: new 'inductive_cases' command and 'ind_cases' method; (Note:
wenzelm@10003
   484
use "(cases (simplified))" method in proper proof texts);
wenzelm@10003
   485
wenzelm@10003
   486
* Isar/HOL: added global 'arith_split' attribute for 'arith' method;
wenzelm@10003
   487
wenzelm@10003
   488
* Isar: names of theorems etc. may be natural numbers as well;
wenzelm@10003
   489
wenzelm@10003
   490
* Isar: 'pr' command: optional arguments for goals_limit and
wenzelm@9724
   491
ProofContext.prems_limit; no longer prints theory contexts, but only
wenzelm@9724
   492
proof states;
wenzelm@8487
   493
wenzelm@10003
   494
* Isar: diagnostic commands 'pr', 'thm', 'prop', 'term', 'typ' admit
wenzelm@8518
   495
additional print modes to be specified; e.g. "pr(latex)" will print
wenzelm@8518
   496
proof state according to the Isabelle LaTeX style;
wenzelm@8487
   497
wenzelm@10003
   498
* Isar: improved support for emulating tactic scripts, including proof
wenzelm@9612
   499
methods 'rule_tac' etc., 'cut_tac', 'thin_tac', 'subgoal_tac',
wenzelm@9612
   500
'rename_tac', 'rotate_tac', 'tactic', and 'case_tac' / 'induct_tac'
wenzelm@9612
   501
(for HOL datatypes);
wenzelm@8534
   502
wenzelm@10003
   503
* Isar: simplified (more robust) goal selection of proof methods: 1st
wenzelm@10003
   504
goal, all goals, or explicit goal specifier (tactic emulation); thus
wenzelm@10003
   505
'proof method scripts' have to be in depth-first order;
wenzelm@8673
   506
wenzelm@10003
   507
* Isar: tuned 'let' syntax: replaced 'as' keyword by 'and';
wenzelm@8729
   508
wenzelm@10003
   509
* Isar: removed 'help' command, which hasn't been too helpful anyway;
wenzelm@10003
   510
should instead use individual commands for printing items
wenzelm@10003
   511
(print_commands, print_methods etc.);
wenzelm@9224
   512
wenzelm@10003
   513
* Isar: added 'nothing' --- the empty list of theorems;
wenzelm@9239
   514
wenzelm@8184
   515
paulson@8014
   516
*** HOL ***
paulson@8014
   517
wenzelm@10080
   518
* HOL/MicroJava: formalization of a fragment of Java, together with a
wenzelm@10080
   519
corresponding virtual machine and a specification of its bytecode
wenzelm@10080
   520
verifier and a lightweight bytecode verifier, including proofs of
wenzelm@10080
   521
type-safety; by Gerwin Klein, Tobias Nipkow, David von Oheimb, and
wenzelm@10080
   522
Cornelia Pusch (see also the homepage of project Bali at
wenzelm@10080
   523
http://isabelle.in.tum.de/Bali/);
wenzelm@10080
   524
wenzelm@8518
   525
* HOL/Algebra: new theory of rings and univariate polynomials, by
wenzelm@8518
   526
Clemens Ballarin;
paulson@8014
   527
wenzelm@10157
   528
* HOL/NumberTheory: fundamental Theorem of Arithmetic, Chinese
wenzelm@10003
   529
Remainder Theorem, Fermat/Euler Theorem, Wilson's Theorem, by Thomas M
wenzelm@10003
   530
Rasmussen;
wenzelm@8570
   531
wenzelm@10157
   532
* HOL/Lattice: fundamental concepts of lattice theory and order
wenzelm@10157
   533
structures, including duals, properties of bounds versus algebraic
wenzelm@10157
   534
laws, lattice operations versus set-theoretic ones, the Knaster-Tarski
wenzelm@10157
   535
Theorem for complete lattices etc.; may also serve as a demonstration
wenzelm@10157
   536
for abstract algebraic reasoning using axiomatic type classes, and
wenzelm@10157
   537
mathematics-style proof in Isabelle/Isar; by Markus Wenzel;
wenzelm@10157
   538
wenzelm@10003
   539
* HOL/Prolog: a (bare-bones) implementation of Lambda-Prolog, by David
wenzelm@10003
   540
von Oheimb;
paulson@9542
   541
wenzelm@10164
   542
* HOL/IMPP: extension of IMP with local variables and mutually
wenzelm@10164
   543
recursive procedures, by David von Oheimb;
wenzelm@10164
   544
wenzelm@10003
   545
* HOL/Lambda: converted into new-style theory and document;
paulson@9542
   546
wenzelm@10003
   547
* HOL/ex/Multiquote: example of multiple nested quotations and
wenzelm@10003
   548
anti-quotations -- basically a generalized version of de-Bruijn
wenzelm@10003
   549
representation; very useful in avoiding lifting of operations;
wenzelm@8848
   550
wenzelm@9612
   551
* HOL/record: added general record equality rule to simpset; fixed
wenzelm@9612
   552
select-update simplification procedure to handle extended records as
wenzelm@9612
   553
well; admit "r" as field name;
paulson@9542
   554
paulson@8967
   555
* HOL: 0 is now overloaded over the new sort "zero", allowing its use with
paulson@8967
   556
other numeric types and also as the identity of groups, rings, etc.;
paulson@8967
   557
paulson@8967
   558
* HOL: new axclass plus_ac0 for addition with the AC-laws and 0 as identity.
paulson@8967
   559
Types nat and int belong to this axclass;
paulson@8967
   560
wenzelm@10003
   561
* HOL: greatly improved simplification involving numerals of type nat, int, real:
paulson@8788
   562
   (i + #8 + j) = Suc k simplifies to  #7 + (i + j) = k
paulson@8832
   563
   i*j + k + j*#3*i     simplifies to  #4*(i*j) + k
paulson@8832
   564
  two terms #m*u and #n*u are replaced by #(m+n)*u
paulson@8832
   565
    (where #m, #n and u can implicitly be 1; this is simproc combine_numerals)
paulson@8832
   566
  and the term/formula #m*u+x ~~ #n*u+y simplifies simplifies to #(m-n)+x ~~ y
paulson@8832
   567
    or x ~~ #(n-m)+y, where ~~ is one of = < <= or - (simproc cancel_numerals);
paulson@8736
   568
wenzelm@10003
   569
* HOL: meson_tac is available (previously in ex/meson.ML); it is a
wenzelm@10003
   570
powerful prover for predicate logic but knows nothing of clasets; see
wenzelm@10003
   571
ex/mesontest.ML and ex/mesontest2.ML for example applications;
paulson@9835
   572
wenzelm@8848
   573
* HOL: new version of "case_tac" subsumes both boolean case split and
wenzelm@8440
   574
"exhaust_tac" on datatypes; INCOMPATIBILITY: exhaust_tac no longer
wenzelm@8518
   575
exists, may define val exhaust_tac = case_tac for ad-hoc portability;
wenzelm@8440
   576
wenzelm@8848
   577
* HOL: simplification no longer dives into case-expressions: only the
wenzelm@10129
   578
selector expression is simplified, but not the remaining arms; to
wenzelm@10129
   579
enable full simplification of case-expressions for datatype t, you may
wenzelm@10129
   580
remove t.weak_case_cong from the simpset, either globally (Delcongs
wenzelm@10129
   581
[thm"t.weak_case_cong"];) or locally (delcongs [...]).
nipkow@8603
   582
wenzelm@8848
   583
* HOL/recdef: the recursion equations generated by 'recdef' for
wenzelm@8848
   584
function 'f' are now called f.simps instead of f.rules; if all
wenzelm@8848
   585
termination conditions are proved automatically, these simplification
wenzelm@8848
   586
rules are added to the simpset, as in primrec; rules may be named
wenzelm@8848
   587
individually as well, resulting in a separate list of theorems for
wenzelm@8848
   588
each equation;
wenzelm@8848
   589
wenzelm@9489
   590
* HOL/While is a new theory that provides a while-combinator. It
wenzelm@9489
   591
permits the definition of tail-recursive functions without the
wenzelm@9489
   592
provision of a termination measure. The latter is necessary once the
wenzelm@9489
   593
invariant proof rule for while is applied.
nipkow@9457
   594
wenzelm@10003
   595
* HOL: new (overloaded) notation for the set of elements below/above
wenzelm@10003
   596
some element: {..u}, {..u(}, {l..}, {)l..}. See theory SetInterval.
nipkow@8925
   597
wenzelm@8848
   598
* HOL: theorems impI, allI, ballI bound as "strip";
wenzelm@8848
   599
wenzelm@10003
   600
* HOL: new tactic induct_thm_tac: thm -> string -> int -> tactic
nipkow@9746
   601
induct_tac th "x1 ... xn" expects th to have a conclusion of the form
nipkow@9746
   602
P v1 ... vn and abbreviates res_inst_tac [("v1","x1"),...,("vn","xn")] th;
nipkow@9746
   603
wenzelm@10003
   604
* HOL/Real: "rabs" replaced by overloaded "abs" function;
nipkow@9737
   605
wenzelm@10003
   606
* HOL: theory Sexp now in HOL/Induct examples (it used to be part of
wenzelm@10003
   607
main HOL, but was unused);
nipkow@8626
   608
wenzelm@10003
   609
* HOL: fewer consts declared as global (e.g. have to refer to
wenzelm@10003
   610
"Lfp.lfp" instead of "lfp" internally; affects ML packages only);
wenzelm@8887
   611
wenzelm@10003
   612
* HOL: tuned AST representation of nested pairs, avoiding bogus output
wenzelm@10003
   613
in case of overlap with user translations (e.g. judgements over
wenzelm@10003
   614
tuples); (note that the underlying logical represenation is still
wenzelm@10003
   615
bogus);
wenzelm@9349
   616
nipkow@8412
   617
paulson@9542
   618
*** ZF ***
paulson@9542
   619
wenzelm@10003
   620
* ZF: simplification automatically cancels common terms in arithmetic
wenzelm@10003
   621
expressions over nat and int;
paulson@9542
   622
wenzelm@10003
   623
* ZF: new treatment of nat to minimize type-checking: all operators
wenzelm@10003
   624
coerce their operands to a natural number using the function natify,
wenzelm@10003
   625
making the algebraic laws unconditional;
paulson@9542
   626
wenzelm@10003
   627
* ZF: as above, for int: operators coerce their operands to an integer
wenzelm@10003
   628
using the function intify;
paulson@9542
   629
wenzelm@10003
   630
* ZF: the integer library now contains many of the usual laws for the
wenzelm@10003
   631
orderings, including $<=, and monotonicity laws for $+ and $*;
paulson@9542
   632
wenzelm@10003
   633
* ZF: new example ZF/ex/NatSum to demonstrate integer arithmetic
wenzelm@10003
   634
simplification;
paulson@9388
   635
wenzelm@10003
   636
* FOL and ZF: AddIffs now available, giving theorems of the form P<->Q
wenzelm@10003
   637
to the simplifier and classical reasoner simultaneously;
paulson@9388
   638
paulson@9388
   639
wenzelm@8358
   640
*** General ***
wenzelm@8358
   641
wenzelm@10003
   642
* Provers: blast_tac now handles actual object-logic rules as
wenzelm@10003
   643
assumptions; note that auto_tac uses blast_tac internally as well;
wenzelm@10003
   644
wenzelm@10003
   645
* Provers: new functions rulify/rulify_no_asm: thm -> thm for turning
wenzelm@10003
   646
outer -->/All/Ball into ==>/!!; qed_spec_mp now uses rulify_no_asm;
wenzelm@10003
   647
wenzelm@9941
   648
* Provers: delrules now handles destruct rules as well (no longer need
wenzelm@9941
   649
explicit make_elim);
wenzelm@9941
   650
wenzelm@10003
   651
* Provers: Blast_tac now warns of and ignores "weak elimination rules" e.g.
wenzelm@10003
   652
  [| inj ?f;          ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
wenzelm@10003
   653
use instead the strong form,
wenzelm@10003
   654
  [| inj ?f; ~ ?W ==> ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
wenzelm@10003
   655
in HOL, FOL and ZF the function cla_make_elim will create such rules
wenzelm@10003
   656
from destruct-rules;
wenzelm@9489
   657
wenzelm@9709
   658
* Provers: Simplifier.easy_setup provides a fast path to basic
wenzelm@9709
   659
Simplifier setup for new object-logics;
wenzelm@9709
   660
wenzelm@9709
   661
* Pure: AST translation rules no longer require constant head on LHS;
wenzelm@9349
   662
wenzelm@9709
   663
* Pure: improved name spaces: ambiguous output is qualified; support
wenzelm@9709
   664
for hiding of names;
wenzelm@8729
   665
wenzelm@10003
   666
* system: smart setup of canonical ML_HOME, ISABELLE_INTERFACE, and
wenzelm@10003
   667
XSYMBOL_HOME; no longer need to do manual configuration in most
wenzelm@10003
   668
situations;
wenzelm@10003
   669
wenzelm@9709
   670
* system: compression of ML heaps images may now be controlled via -c
wenzelm@9709
   671
option of isabelle and isatool usedir (currently only observed by
wenzelm@9709
   672
Poly/ML);
wenzelm@8358
   673
wenzelm@9981
   674
* system: isatool installfonts may handle X-Symbol fonts as well (very
wenzelm@9981
   675
useful for remote X11);
wenzelm@9981
   676
wenzelm@9709
   677
* system: provide TAGS file for Isabelle sources;
wenzelm@9052
   678
wenzelm@9288
   679
* ML: infix 'OF' is a version of 'MRS' with more appropriate argument
wenzelm@9288
   680
order;
wenzelm@9288
   681
wenzelm@8994
   682
* ML: renamed flags Syntax.trace_norm_ast to Syntax.trace_ast; global
wenzelm@8994
   683
timing flag supersedes proof_timing and Toplevel.trace;
wenzelm@8994
   684
wenzelm@10003
   685
* ML: new combinators |>> and |>>> for incremental transformations
wenzelm@10003
   686
with secondary results (e.g. certain theory extensions):
wenzelm@10003
   687
wenzelm@9330
   688
* ML: PureThy.add_defs gets additional argument to indicate potential
wenzelm@9330
   689
overloading (usually false);
wenzelm@9330
   690
wenzelm@10003
   691
* ML: PureThy.add_thms/add_axioms/add_defs now return theorems as
wenzelm@10003
   692
results;
wenzelm@8440
   693
wenzelm@8358
   694
wenzelm@8015
   695
wenzelm@7986
   696
New in Isabelle99 (October 1999)
wenzelm@7986
   697
--------------------------------
oheimb@4649
   698
paulson@5931
   699
*** Overview of INCOMPATIBILITIES (see below for more details) ***
paulson@5931
   700
paulson@6922
   701
* HOL: The THEN and ELSE parts of conditional expressions (if P then x else y)
paulson@6922
   702
are no longer simplified.  (This allows the simplifier to unfold recursive
paulson@6922
   703
functional programs.)  To restore the old behaviour, declare
wenzelm@7215
   704
wenzelm@7215
   705
    Delcongs [if_weak_cong];
paulson@6922
   706
wenzelm@6269
   707
* HOL: Removed the obsolete syntax "Compl A"; use -A for set
wenzelm@6269
   708
complement;
paulson@5931
   709
wenzelm@6269
   710
* HOL: the predicate "inj" is now defined by translation to "inj_on";
paulson@6174
   711
berghofe@7847
   712
* HOL/datatype: mutual_induct_tac no longer exists --
berghofe@7847
   713
  use induct_tac "x_1 ... x_n" instead of mutual_induct_tac ["x_1", ..., "x_n"]
berghofe@7847
   714
wenzelm@6386
   715
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
   716
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
   717
wenzelm@6269
   718
* ZF: The con_defs part of an inductive definition may no longer refer
wenzelm@6269
   719
to constants declared in the same theory;
nipkow@6057
   720
wenzelm@6269
   721
* HOL, ZF: the function mk_cases, generated by the inductive
wenzelm@6269
   722
definition package, has lost an argument.  To simplify its result, it
wenzelm@6269
   723
uses the default simpset instead of a supplied list of theorems.
paulson@6141
   724
wenzelm@7215
   725
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
   726
nipkow@7619
   727
* Simplifier: the type of the infix ML functions
wenzelm@8729
   728
        setSSolver addSSolver setSolver addSolver
nipkow@7619
   729
is now  simpset * solver -> simpset  where `solver' is a new abstract type
nipkow@7619
   730
for packaging solvers. A solver is created via
wenzelm@8729
   731
        mk_solver: string -> (thm list -> int -> tactic) -> solver
nipkow@7619
   732
where the string argument is only a comment.
nipkow@6057
   733
wenzelm@7647
   734
paulson@6069
   735
*** Proof tools ***
paulson@6069
   736
wenzelm@6343
   737
* Provers/Arith/fast_lin_arith.ML contains a functor for creating a
wenzelm@6343
   738
decision procedure for linear arithmetic. Currently it is used for
wenzelm@7593
   739
types `nat', `int', and `real' in HOL (see below); it can, should and
wenzelm@7593
   740
will be instantiated for other types and logics as well.
paulson@6069
   741
nipkow@7324
   742
* The simplifier now accepts rewrite rules with flexible heads, eg
nipkow@7324
   743
     hom ?f ==> ?f(?x+?y) = ?f ?x + ?f ?y
nipkow@7324
   744
  They are applied like any rule with a non-pattern lhs, i.e. by first-order
nipkow@7324
   745
  matching.
paulson@6069
   746
wenzelm@7593
   747
paulson@6014
   748
*** General ***
paulson@6014
   749
wenzelm@7986
   750
* New Isabelle/Isar subsystem provides an alternative to traditional
wenzelm@7215
   751
tactical theorem proving; together with the ProofGeneral/isar user
wenzelm@7215
   752
interface it offers an interactive environment for developing human
wenzelm@7215
   753
readable proof documents (Isar == Intelligible semi-automated
wenzelm@7886
   754
reasoning); for further information see isatool doc isar-ref,
wenzelm@7986
   755
src/HOL/Isar_examples and http://isabelle.in.tum.de/Isar/
wenzelm@7886
   756
wenzelm@9612
   757
* improved and simplified presentation of theories: better HTML markup
wenzelm@9612
   758
(including colors), graph views in several sizes; isatool usedir now
wenzelm@9612
   759
provides a proper interface for user theories (via -P option); actual
wenzelm@9612
   760
document preparation based on (PDF)LaTeX is available as well (for
wenzelm@9612
   761
new-style theories only); see isatool doc system for more information;
wenzelm@7215
   762
wenzelm@7252
   763
* native support for Proof General, both for classic Isabelle and
wenzelm@7986
   764
Isabelle/Isar;
wenzelm@7215
   765
wenzelm@7791
   766
* ML function thm_deps visualizes dependencies of theorems and lemmas,
wenzelm@7791
   767
using the graph browser tool;
wenzelm@7791
   768
wenzelm@6751
   769
* Isabelle manuals now also available as PDF;
wenzelm@6751
   770
wenzelm@6449
   771
* theory loader rewritten from scratch (may not be fully
wenzelm@6449
   772
bug-compatible); old loadpath variable has been replaced by show_path,
wenzelm@6671
   773
add_path, del_path, reset_path functions; new operations such as
wenzelm@7593
   774
update_thy, touch_thy, remove_thy, use/update_thy_only (see also
wenzelm@7593
   775
isatool doc ref);
wenzelm@6449
   776
wenzelm@7215
   777
* improved isatool install: option -k creates KDE application icon,
wenzelm@7215
   778
option -p DIR installs standalone binaries;
wenzelm@7215
   779
wenzelm@7215
   780
* added ML_PLATFORM setting (useful for cross-platform installations);
wenzelm@7215
   781
more robust handling of platform specific ML images for SML/NJ;
wenzelm@7215
   782
wenzelm@7886
   783
* the settings environment is now statically scoped, i.e. it is never
wenzelm@7986
   784
created again in sub-processes invoked from isabelle, isatool, or
wenzelm@7886
   785
Isabelle;
wenzelm@7886
   786
wenzelm@7215
   787
* path element specification '~~' refers to '$ISABELLE_HOME';
wenzelm@7215
   788
wenzelm@6343
   789
* in locales, the "assumes" and "defines" parts may be omitted if
wenzelm@6343
   790
empty;
wenzelm@5973
   791
wenzelm@6269
   792
* new print_mode "xsymbols" for extended symbol support (e.g. genuine
wenzelm@6269
   793
long arrows);
wenzelm@6259
   794
wenzelm@6343
   795
* new print_mode "HTML";
wenzelm@6343
   796
wenzelm@6343
   797
* new flag show_tags controls display of tags of theorems (which are
wenzelm@6343
   798
basically just comments that may be attached by some tools);
wenzelm@6343
   799
wenzelm@6461
   800
* Isamode 2.6 requires patch to accomodate change of Isabelle font
wenzelm@6461
   801
mode and goal output format:
wenzelm@6461
   802
wenzelm@6461
   803
diff -r Isamode-2.6/elisp/isa-load.el Isamode/elisp/isa-load.el
wenzelm@6461
   804
244c244
wenzelm@6461
   805
<       (list (isa-getenv "ISABELLE") "-msymbols" logic-name)
wenzelm@6461
   806
---
wenzelm@6533
   807
>       (list (isa-getenv "ISABELLE") "-misabelle_font" "-msymbols" logic-name)
wenzelm@6461
   808
diff -r Isabelle-2.6/elisp/isa-proofstate.el Isamode/elisp/isa-proofstate.el
wenzelm@6461
   809
181c181
wenzelm@6461
   810
< (defconst proofstate-proofstart-regexp "^Level [0-9]+$"
wenzelm@6461
   811
---
wenzelm@6461
   812
> (defconst proofstate-proofstart-regexp "^Level [0-9]+"
wenzelm@6461
   813
wenzelm@7450
   814
* function bind_thms stores lists of theorems (cf. bind_thm);
wenzelm@7450
   815
wenzelm@7593
   816
* new shorthand tactics ftac, eatac, datac, fatac;
wenzelm@7593
   817
wenzelm@7593
   818
* qed (and friends) now accept "" as result name; in that case the
wenzelm@7986
   819
theorem is not stored, but proper checks and presentation of the
wenzelm@7986
   820
result still apply;
wenzelm@7593
   821
wenzelm@7805
   822
* theorem database now also indexes constants "Trueprop", "all",
wenzelm@7805
   823
"==>", "=="; thus thms_containing, findI etc. may retrieve more rules;
wenzelm@7805
   824
oheimb@6028
   825
nipkow@6057
   826
*** HOL ***
nipkow@6057
   827
wenzelm@7215
   828
** HOL arithmetic **
wenzelm@7215
   829
wenzelm@6343
   830
* There are now decision procedures for linear arithmetic over nat and
wenzelm@6343
   831
int:
nipkow@6131
   832
wenzelm@6343
   833
1. arith_tac copes with arbitrary formulae involving `=', `<', `<=',
wenzelm@6343
   834
`+', `-', `Suc', `min', `max' and numerical constants; other subterms
wenzelm@6343
   835
are treated as atomic; subformulae not involving type `nat' or `int'
wenzelm@6343
   836
are ignored; quantified subformulae are ignored unless they are
wenzelm@6343
   837
positive universal or negative existential. The tactic has to be
wenzelm@6343
   838
invoked by hand and can be a little bit slow. In particular, the
wenzelm@6343
   839
running time is exponential in the number of occurrences of `min' and
wenzelm@6343
   840
`max', and `-' on `nat'.
nipkow@6131
   841
wenzelm@6343
   842
2. fast_arith_tac is a cut-down version of arith_tac: it only takes
wenzelm@6343
   843
(negated) (in)equalities among the premises and the conclusion into
wenzelm@6343
   844
account (i.e. no compound formulae) and does not know about `min' and
wenzelm@6343
   845
`max', and `-' on `nat'. It is fast and is used automatically by the
wenzelm@6343
   846
simplifier.
nipkow@6131
   847
wenzelm@6343
   848
NB: At the moment, these decision procedures do not cope with mixed
wenzelm@6343
   849
nat/int formulae where the two parts interact, such as `m < n ==>
wenzelm@6343
   850
int(m) < int(n)'.
oheimb@6028
   851
wenzelm@7215
   852
* HOL/Numeral provides a generic theory of numerals (encoded
wenzelm@7313
   853
efficiently as bit strings); setup for types nat/int/real is in place;
wenzelm@7215
   854
INCOMPATIBILITY: since numeral syntax is now polymorphic, rather than
wenzelm@7215
   855
int, existing theories and proof scripts may require a few additional
wenzelm@7215
   856
type constraints;
wenzelm@7215
   857
wenzelm@7215
   858
* integer division and remainder can now be performed on constant
wenzelm@7215
   859
arguments;
paulson@7157
   860
wenzelm@7215
   861
* many properties of integer multiplication, division and remainder
wenzelm@7215
   862
are now available;
paulson@6922
   863
paulson@7287
   864
* An interface to the Stanford Validity Checker (SVC) is available through the
paulson@7287
   865
tactic svc_tac.  Propositional tautologies and theorems of linear arithmetic
paulson@7287
   866
are proved automatically.  SVC must be installed separately, and its results
paulson@7287
   867
must be TAKEN ON TRUST (Isabelle does not check the proofs, but tags any
paulson@7287
   868
invocation of the underlying oracle).  For SVC see
paulson@7444
   869
  http://verify.stanford.edu/SVC
paulson@6922
   870
wenzelm@7125
   871
* IsaMakefile: the HOL-Real target now builds an actual image;
wenzelm@7125
   872
wenzelm@7215
   873
wenzelm@7215
   874
** HOL misc **
wenzelm@7215
   875
wenzelm@7595
   876
* HOL/Real/HahnBanach: the Hahn-Banach theorem for real vector spaces
wenzelm@7595
   877
(in Isabelle/Isar) -- by Gertrud Bauer;
wenzelm@7595
   878
wenzelm@7691
   879
* HOL/BCV: generic model of bytecode verification, i.e. data-flow
wenzelm@7691
   880
analysis for assembly languages with subtypes;
wenzelm@7691
   881
wenzelm@6278
   882
* HOL/TLA (Lamport's Temporal Logic of Actions): major reorganization
wenzelm@6278
   883
-- avoids syntactic ambiguities and treats state, transition, and
wenzelm@6278
   884
temporal levels more uniformly; introduces INCOMPATIBILITIES due to
wenzelm@6278
   885
changed syntax and (many) tactics;
wenzelm@6278
   886
wenzelm@7791
   887
* HOL/inductive: Now also handles more general introduction rules such
wenzelm@7791
   888
  as "ALL y. (y, x) : r --> y : acc r ==> x : acc r"; monotonicity
wenzelm@7791
   889
  theorems are now maintained within the theory (maintained via the
wenzelm@7791
   890
  "mono" attribute);
berghofe@7780
   891
wenzelm@7238
   892
* HOL/datatype: Now also handles arbitrarily branching datatypes
wenzelm@7238
   893
  (using function types) such as
wenzelm@7238
   894
wenzelm@7238
   895
  datatype 'a tree = Atom 'a | Branch "nat => 'a tree"
berghofe@7047
   896
wenzelm@7326
   897
* HOL/record: record_simproc (part of the default simpset) takes care
wenzelm@7326
   898
of selectors applied to updated records; record_split_tac is no longer
wenzelm@7327
   899
part of the default claset; update_defs may now be removed from the
wenzelm@7327
   900
simpset in many cases; COMPATIBILITY: old behavior achieved by
wenzelm@7326
   901
wenzelm@7326
   902
  claset_ref () := claset() addSWrapper record_split_wrapper;
wenzelm@7326
   903
  Delsimprocs [record_simproc]
wenzelm@7326
   904
wenzelm@6386
   905
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
   906
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
   907
paulson@7287
   908
* HOL/recdef (TFL): 'congs' syntax now expects comma separated list of theorem
paulson@7287
   909
names rather than an ML expression;
paulson@7287
   910
paulson@7287
   911
* HOL/defer_recdef (TFL): like recdef but the well-founded relation can be
paulson@7287
   912
supplied later.  Program schemes can be defined, such as
paulson@7287
   913
    "While B C s = (if B s then While B C (C s) else s)"
paulson@7287
   914
where the well-founded relation can be chosen after B and C have been given.
wenzelm@6563
   915
wenzelm@7215
   916
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
   917
INCOMPATIBILITY: while [] and infix # syntax is still there, of
wenzelm@7215
   918
course, ML tools referring to List.list.op # etc. have to be adapted;
wenzelm@7215
   919
wenzelm@7238
   920
* HOL_quantifiers flag superseded by "HOL" print mode, which is
wenzelm@7238
   921
disabled by default; run isabelle with option -m HOL to get back to
wenzelm@7238
   922
the original Gordon/HOL-style output;
wenzelm@7238
   923
wenzelm@7238
   924
* HOL/Ord.thy: new bounded quantifier syntax (input only): ALL x<y. P,
wenzelm@7238
   925
ALL x<=y. P, EX x<y. P, EX x<=y. P;
wenzelm@7238
   926
wenzelm@7238
   927
* HOL basic syntax simplified (more orthogonal): all variants of
wenzelm@7238
   928
All/Ex now support plain / symbolic / HOL notation; plain syntax for
wenzelm@7238
   929
Eps operator is provided as well: "SOME x. P[x]";
wenzelm@7238
   930
berghofe@7320
   931
* HOL/Sum.thy: sum_case has been moved to HOL/Datatype;
wenzelm@7261
   932
wenzelm@7280
   933
* HOL/Univ.thy: infix syntax <*>, <+>, <**>, <+> eliminated and made
wenzelm@7280
   934
thus available for user theories;
wenzelm@7280
   935
wenzelm@7300
   936
* HOLCF/IOA/Sequents: renamed 'Cons' to 'Consq' to avoid clash with
wenzelm@7300
   937
HOL/List; hardly an INCOMPATIBILITY since '>>' syntax is used all the
wenzelm@7300
   938
time;
wenzelm@7300
   939
wenzelm@7986
   940
* HOL: new tactic smp_tac: int -> int -> tactic, which applies spec
wenzelm@7986
   941
several times and then mp;
oheimb@7492
   942
wenzelm@7215
   943
paulson@7113
   944
*** LK ***
paulson@7113
   945
wenzelm@7215
   946
* the notation <<...>> is now available as a notation for sequences of
wenzelm@7215
   947
formulas;
paulson@7113
   948
paulson@7113
   949
* the simplifier is now installed
paulson@7113
   950
wenzelm@8729
   951
* the axiom system has been generalized (thanks to Soren Heilmann)
paulson@7113
   952
paulson@7113
   953
* the classical reasoner now has a default rule database
paulson@7113
   954
paulson@7113
   955
paulson@6064
   956
*** ZF ***
paulson@6064
   957
paulson@6064
   958
* new primrec section allows primitive recursive functions to be given
wenzelm@6269
   959
directly (as in HOL) over datatypes and the natural numbers;
paulson@6064
   960
wenzelm@6269
   961
* new tactics induct_tac and exhaust_tac for induction (or case
wenzelm@6269
   962
analysis) over datatypes and the natural numbers;
paulson@6064
   963
paulson@6064
   964
* the datatype declaration of type T now defines the recursor T_rec;
paulson@6064
   965
paulson@6141
   966
* simplification automatically does freeness reasoning for datatype
wenzelm@6269
   967
constructors;
paulson@6141
   968
wenzelm@6269
   969
* automatic type-inference, with AddTCs command to insert new
wenzelm@6269
   970
type-checking rules;
paulson@6155
   971
wenzelm@6269
   972
* datatype introduction rules are now added as Safe Introduction rules
wenzelm@6269
   973
to the claset;
paulson@6155
   974
wenzelm@6269
   975
* the syntax "if P then x else y" is now available in addition to
wenzelm@6269
   976
if(P,x,y);
wenzelm@6269
   977
paulson@6069
   978
wenzelm@6343
   979
*** Internal programming interfaces ***
wenzelm@6343
   980
wenzelm@7919
   981
* tuned simplifier trace output; new flag debug_simp;
wenzelm@7919
   982
wenzelm@7420
   983
* structures Vartab / Termtab (instances of TableFun) offer efficient
wenzelm@7420
   984
tables indexed by indexname_ord / term_ord (compatible with aconv);
wenzelm@7420
   985
wenzelm@6386
   986
* AxClass.axclass_tac lost the theory argument;
wenzelm@6386
   987
wenzelm@6343
   988
* tuned current_goals_markers semantics: begin / end goal avoids
wenzelm@6343
   989
printing empty lines;
wenzelm@6343
   990
wenzelm@6343
   991
* removed prs and prs_fn hook, which was broken because it did not
wenzelm@6343
   992
include \n in its semantics, forcing writeln to add one
wenzelm@6343
   993
uncoditionally; replaced prs_fn by writeln_fn; consider std_output:
wenzelm@6343
   994
string -> unit if you really want to output text without newline;
wenzelm@6343
   995
wenzelm@6343
   996
* Symbol.output subject to print mode; INCOMPATIBILITY: defaults to
wenzelm@6343
   997
plain output, interface builders may have to enable 'isabelle_font'
wenzelm@6343
   998
mode to get Isabelle font glyphs as before;
wenzelm@6343
   999
wenzelm@6343
  1000
* refined token_translation interface; INCOMPATIBILITY: output length
wenzelm@6343
  1001
now of type real instead of int;
wenzelm@6343
  1002
wenzelm@7196
  1003
* theory loader actions may be traced via new ThyInfo.add_hook
wenzelm@7196
  1004
interface (see src/Pure/Thy/thy_info.ML); example application: keep
wenzelm@7196
  1005
your own database of information attached to *whole* theories -- as
wenzelm@7196
  1006
opposed to intra-theory data slots offered via TheoryDataFun;
wenzelm@7196
  1007
wenzelm@7647
  1008
* proper handling of dangling sort hypotheses (at last!);
wenzelm@7647
  1009
Thm.strip_shyps and Drule.strip_shyps_warning take care of removing
wenzelm@7647
  1010
extra sort hypotheses that can be witnessed from the type signature;
wenzelm@7986
  1011
the force_strip_shyps flag is gone, any remaining shyps are simply
wenzelm@7986
  1012
left in the theorem (with a warning issued by strip_shyps_warning);
wenzelm@7647
  1013
wenzelm@6343
  1014
paulson@6064
  1015
wenzelm@5781
  1016
New in Isabelle98-1 (October 1998)
wenzelm@5781
  1017
----------------------------------
wenzelm@5781
  1018
wenzelm@5127
  1019
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4842
  1020
wenzelm@5726
  1021
* several changes of automated proof tools;
wenzelm@5373
  1022
wenzelm@5726
  1023
* HOL: major changes to the inductive and datatype packages, including
wenzelm@5726
  1024
some minor incompatibilities of theory syntax;
berghofe@5214
  1025
wenzelm@5726
  1026
* HOL: renamed r^-1 to 'converse' from 'inverse'; 'inj_onto' is now
wenzelm@5217
  1027
called `inj_on';
paulson@5160
  1028
nipkow@5275
  1029
* HOL: removed duplicate thms in Arith:
nipkow@5275
  1030
  less_imp_add_less  should be replaced by  trans_less_add1
nipkow@5275
  1031
  le_imp_add_le      should be replaced by  trans_le_add1
paulson@5160
  1032
wenzelm@5726
  1033
* HOL: unary minus is now overloaded (new type constraints may be
wenzelm@5726
  1034
required);
paulson@5490
  1035
wenzelm@5726
  1036
* HOL and ZF: unary minus for integers is now #- instead of #~.  In
wenzelm@5726
  1037
ZF, expressions such as n#-1 must be changed to n#- 1, since #-1 is
wenzelm@5726
  1038
now taken as an integer constant.
paulson@5541
  1039
wenzelm@5726
  1040
* Pure: ML function 'theory_of' renamed to 'theory';
wenzelm@5397
  1041
wenzelm@5363
  1042
wenzelm@5127
  1043
*** Proof tools ***
nipkow@4880
  1044
nipkow@5657
  1045
* Simplifier:
nipkow@5657
  1046
  1. Asm_full_simp_tac is now more aggressive.
nipkow@5657
  1047
     1. It will sometimes reorient premises if that increases their power to
nipkow@5657
  1048
        simplify.
nipkow@5657
  1049
     2. It does no longer proceed strictly from left to right but may also
nipkow@5657
  1050
        rotate premises to achieve further simplification.
nipkow@5657
  1051
     For compatibility reasons there is now Asm_lr_simp_tac which is like the
nipkow@5657
  1052
     old Asm_full_simp_tac in that it does not rotate premises.
nipkow@5657
  1053
  2. The simplifier now knows a little bit about nat-arithmetic.
nipkow@4880
  1054
wenzelm@5127
  1055
* Classical reasoner: wrapper mechanism for the classical reasoner now
wenzelm@5127
  1056
allows for selected deletion of wrappers, by introduction of names for
wenzelm@5127
  1057
wrapper functionals.  This implies that addbefore, addSbefore,
wenzelm@5127
  1058
addaltern, and addSaltern now take a pair (name, tactic) as argument,
wenzelm@5127
  1059
and that adding two tactics with the same name overwrites the first
wenzelm@5127
  1060
one (emitting a warning).
oheimb@4824
  1061
  type wrapper = (int -> tactic) -> (int -> tactic)
oheimb@4649
  1062
  setWrapper, setSWrapper, compWrapper and compSWrapper are replaced by
oheimb@4824
  1063
  addWrapper, addSWrapper: claset * (string * wrapper) -> claset
oheimb@4824
  1064
  delWrapper, delSWrapper: claset *  string            -> claset
oheimb@4649
  1065
  getWrapper is renamed to appWrappers, getSWrapper to appSWrappers;
oheimb@4649
  1066
wenzelm@5705
  1067
* Classical reasoner: addbefore/addSbefore now have APPEND/ORELSE
wenzelm@5726
  1068
semantics; addbefore now affects only the unsafe part of step_tac
wenzelm@5726
  1069
etc.; this affects addss/auto_tac/force_tac, so EXISTING PROOFS MAY
wenzelm@5726
  1070
FAIL, but proofs should be fixable easily, e.g. by replacing Auto_tac
wenzelm@5726
  1071
by Force_tac;
oheimb@5524
  1072
wenzelm@5726
  1073
* Classical reasoner: setwrapper to setWrapper and compwrapper to
wenzelm@5726
  1074
compWrapper; added safe wrapper (and access functions for it);
oheimb@5524
  1075
wenzelm@5127
  1076
* HOL/split_all_tac is now much faster and fails if there is nothing
wenzelm@5726
  1077
to split.  Some EXISTING PROOFS MAY REQUIRE ADAPTION because the order
wenzelm@5726
  1078
and the names of the automatically generated variables have changed.
wenzelm@5726
  1079
split_all_tac has moved within claset() from unsafe wrappers to safe
wenzelm@5726
  1080
wrappers, which means that !!-bound variables are split much more
wenzelm@5726
  1081
aggressively, and safe_tac and clarify_tac now split such variables.
wenzelm@5726
  1082
If this splitting is not appropriate, use delSWrapper "split_all_tac".
wenzelm@5726
  1083
Note: the same holds for record_split_tac, which does the job of
wenzelm@5726
  1084
split_all_tac for record fields.
wenzelm@5127
  1085
wenzelm@5726
  1086
* HOL/Simplifier: Rewrite rules for case distinctions can now be added
wenzelm@5726
  1087
permanently to the default simpset using Addsplits just like
wenzelm@5726
  1088
Addsimps. They can be removed via Delsplits just like
wenzelm@5726
  1089
Delsimps. Lower-case versions are also available.
wenzelm@5127
  1090
wenzelm@5726
  1091
* HOL/Simplifier: The rule split_if is now part of the default
wenzelm@5726
  1092
simpset. This means that the simplifier will eliminate all occurrences
wenzelm@5726
  1093
of if-then-else in the conclusion of a goal. To prevent this, you can
wenzelm@5726
  1094
either remove split_if completely from the default simpset by
wenzelm@5726
  1095
`Delsplits [split_if]' or remove it in a specific call of the
wenzelm@5726
  1096
simplifier using `... delsplits [split_if]'.  You can also add/delete
wenzelm@5726
  1097
other case splitting rules to/from the default simpset: every datatype
wenzelm@5726
  1098
generates suitable rules `split_t_case' and `split_t_case_asm' (where
wenzelm@5726
  1099
t is the name of the datatype).
wenzelm@5127
  1100
wenzelm@5726
  1101
* Classical reasoner / Simplifier combination: new force_tac (and
wenzelm@5127
  1102
derivatives Force_tac, force) combines rewriting and classical
wenzelm@5127
  1103
reasoning (and whatever other tools) similarly to auto_tac, but is
wenzelm@5726
  1104
aimed to solve the given subgoal completely.
wenzelm@5127
  1105
wenzelm@5127
  1106
wenzelm@5127
  1107
*** General ***
wenzelm@5127
  1108
wenzelm@5217
  1109
* new top-level commands `Goal' and `Goalw' that improve upon `goal'
wenzelm@5127
  1110
and `goalw': the theory is no longer needed as an explicit argument -
wenzelm@5127
  1111
the current theory context is used; assumptions are no longer returned
wenzelm@5127
  1112
at the ML-level unless one of them starts with ==> or !!; it is
wenzelm@5217
  1113
recommended to convert to these new commands using isatool fixgoal
wenzelm@5217
  1114
(backup your sources first!);
wenzelm@4842
  1115
wenzelm@5217
  1116
* new top-level commands 'thm' and 'thms' for retrieving theorems from
wenzelm@5207
  1117
the current theory context, and 'theory' to lookup stored theories;
paulson@4806
  1118
paulson@5722
  1119
* new theory section 'locale' for declaring constants, assumptions and
paulson@5722
  1120
definitions that have local scope;
paulson@5722
  1121
wenzelm@5127
  1122
* new theory section 'nonterminals' for purely syntactic types;
wenzelm@4858
  1123
wenzelm@5127
  1124
* new theory section 'setup' for generic ML setup functions
wenzelm@5127
  1125
(e.g. package initialization);
wenzelm@4869
  1126
wenzelm@5131
  1127
* the distribution now includes Isabelle icons: see
wenzelm@5131
  1128
lib/logo/isabelle-{small,tiny}.xpm;
wenzelm@5131
  1129
wenzelm@5363
  1130
* isatool install - install binaries with absolute references to
wenzelm@5363
  1131
ISABELLE_HOME/bin;
wenzelm@5363
  1132
wenzelm@5572
  1133
* isatool logo -- create instances of the Isabelle logo (as EPS);
wenzelm@5572
  1134
wenzelm@5407
  1135
* print mode 'emacs' reserved for Isamode;
wenzelm@5407
  1136
wenzelm@5726
  1137
* support multiple print (ast) translations per constant name;
wenzelm@5726
  1138
wenzelm@6925
  1139
* theorems involving oracles are now printed with a suffixed [!];
wenzelm@6925
  1140
wenzelm@4711
  1141
paulson@4661
  1142
*** HOL ***
paulson@4661
  1143
wenzelm@5710
  1144
* there is now a tutorial on Isabelle/HOL (do 'isatool doc tutorial');
nipkow@5709
  1145
wenzelm@5217
  1146
* HOL/inductive package reorganized and improved: now supports mutual
paulson@5267
  1147
definitions such as
wenzelm@5217
  1148
wenzelm@5217
  1149
  inductive EVEN ODD
wenzelm@5217
  1150
    intrs
wenzelm@5217
  1151
      null "0 : EVEN"
wenzelm@5217
  1152
      oddI "n : EVEN ==> Suc n : ODD"
wenzelm@5217
  1153
      evenI "n : ODD ==> Suc n : EVEN"
wenzelm@5217
  1154
wenzelm@5217
  1155
new theorem list "elims" contains an elimination rule for each of the
wenzelm@5217
  1156
recursive sets; inductive definitions now handle disjunctive premises
wenzelm@5217
  1157
correctly (also ZF);
berghofe@5214
  1158
wenzelm@5217
  1159
INCOMPATIBILITIES: requires Inductive as an ancestor; component
wenzelm@5217
  1160
"mutual_induct" no longer exists - the induction rule is always
wenzelm@5217
  1161
contained in "induct";
wenzelm@5217
  1162
wenzelm@5217
  1163
wenzelm@5217
  1164
* HOL/datatype package re-implemented and greatly improved: now
paulson@5267
  1165
supports mutually recursive datatypes such as
wenzelm@5217
  1166
wenzelm@5217
  1167
  datatype
wenzelm@5217
  1168
    'a aexp = IF_THEN_ELSE ('a bexp) ('a aexp) ('a aexp)
wenzelm@5217
  1169
            | SUM ('a aexp) ('a aexp)
wenzelm@5217
  1170
            | DIFF ('a aexp) ('a aexp)
wenzelm@5217
  1171
            | NUM 'a
wenzelm@5217
  1172
  and
wenzelm@5217
  1173
    'a bexp = LESS ('a aexp) ('a aexp)
wenzelm@5217
  1174
            | AND ('a bexp) ('a bexp)
wenzelm@5217
  1175
            | OR ('a bexp) ('a bexp)
wenzelm@5217
  1176
paulson@5267
  1177
as well as indirectly recursive datatypes such as
berghofe@5214
  1178
wenzelm@5217
  1179
  datatype
wenzelm@5217
  1180
    ('a, 'b) term = Var 'a
wenzelm@5217
  1181
                  | App 'b ((('a, 'b) term) list)
berghofe@5214
  1182
wenzelm@5217
  1183
The new tactic  mutual_induct_tac [<var_1>, ..., <var_n>] i  performs
wenzelm@5217
  1184
induction on mutually / indirectly recursive datatypes.
wenzelm@5217
  1185
wenzelm@5217
  1186
Primrec equations are now stored in theory and can be accessed via
wenzelm@5217
  1187
<function_name>.simps.
wenzelm@5217
  1188
wenzelm@5217
  1189
INCOMPATIBILITIES:
berghofe@5214
  1190
wenzelm@5217
  1191
  - Theories using datatypes must now have theory Datatype as an
wenzelm@5217
  1192
    ancestor.
wenzelm@5217
  1193
  - The specific <typename>.induct_tac no longer exists - use the
wenzelm@5217
  1194
    generic induct_tac instead.
berghofe@5226
  1195
  - natE has been renamed to nat.exhaust - use exhaust_tac
wenzelm@5217
  1196
    instead of res_inst_tac ... natE. Note that the variable
berghofe@5226
  1197
    names in nat.exhaust differ from the names in natE, this
wenzelm@5217
  1198
    may cause some "fragile" proofs to fail.
wenzelm@5217
  1199
  - The theorems split_<typename>_case and split_<typename>_case_asm
wenzelm@5217
  1200
    have been renamed to <typename>.split and <typename>.split_asm.
wenzelm@5217
  1201
  - Since default sorts of type variables are now handled correctly,
wenzelm@5217
  1202
    some datatype definitions may have to be annotated with explicit
wenzelm@5217
  1203
    sort constraints.
wenzelm@5217
  1204
  - Primrec definitions no longer require function name and type
wenzelm@5217
  1205
    of recursive argument.
berghofe@5214
  1206
wenzelm@5217
  1207
Consider using isatool fixdatatype to adapt your theories and proof
wenzelm@5217
  1208
scripts to the new package (backup your sources first!).
wenzelm@5217
  1209
wenzelm@5217
  1210
wenzelm@5726
  1211
* HOL/record package: considerably improved implementation; now
wenzelm@5726
  1212
includes concrete syntax for record types, terms, updates; theorems
wenzelm@5726
  1213
for surjective pairing and splitting !!-bound record variables; proof
wenzelm@5726
  1214
support is as follows:
wenzelm@5726
  1215
wenzelm@5726
  1216
  1) standard conversions (selectors or updates applied to record
wenzelm@5726
  1217
constructor terms) are part of the standard simpset;
wenzelm@5726
  1218
wenzelm@5726
  1219
  2) inject equations of the form ((x, y) = (x', y')) == x=x' & y=y' are
wenzelm@5726
  1220
made part of standard simpset and claset via addIffs;
wenzelm@5726
  1221
wenzelm@5726
  1222
  3) a tactic for record field splitting (record_split_tac) is part of
wenzelm@5726
  1223
the standard claset (addSWrapper);
wenzelm@5726
  1224
wenzelm@5726
  1225
To get a better idea about these rules you may retrieve them via
wenzelm@5726
  1226
something like 'thms "foo.simps"' or 'thms "foo.iffs"', where "foo" is
wenzelm@5726
  1227
the name of your record type.
wenzelm@5726
  1228
wenzelm@5726
  1229
The split tactic 3) conceptually simplifies by the following rule:
wenzelm@5726
  1230
wenzelm@5726
  1231
  "(!!x. PROP ?P x) == (!!a b. PROP ?P (a, b))"
wenzelm@5726
  1232
wenzelm@5726
  1233
Thus any record variable that is bound by meta-all will automatically
wenzelm@5726
  1234
blow up into some record constructor term, consequently the
wenzelm@5726
  1235
simplifications of 1), 2) apply.  Thus force_tac, auto_tac etc. shall
wenzelm@5726
  1236
solve record problems automatically.
wenzelm@5726
  1237
berghofe@5214
  1238
wenzelm@5125
  1239
* reorganized the main HOL image: HOL/Integ and String loaded by
wenzelm@5125
  1240
default; theory Main includes everything;
wenzelm@5125
  1241
paulson@5650
  1242
* automatic simplification of integer sums and comparisons, using cancellation;
paulson@5650
  1243
oheimb@5526
  1244
* added option_map_eq_Some and not_Some_eq to the default simpset and claset;
wenzelm@5127
  1245
wenzelm@5127
  1246
* added disj_not1 = "(~P | Q) = (P --> Q)" to the default simpset;
wenzelm@5127
  1247
wenzelm@5127
  1248
* many new identities for unions, intersections, set difference, etc.;
wenzelm@5127
  1249
wenzelm@5127
  1250
* expand_if, expand_split, expand_sum_case and expand_nat_case are now
wenzelm@5127
  1251
called split_if, split_split, split_sum_case and split_nat_case (to go
wenzelm@5127
  1252
with add/delsplits);
wenzelm@5125
  1253
wenzelm@5127
  1254
* HOL/Prod introduces simplification procedure unit_eq_proc rewriting
wenzelm@5127
  1255
(?x::unit) = (); this is made part of the default simpset, which COULD
wenzelm@5127
  1256
MAKE EXISTING PROOFS FAIL under rare circumstances (consider
wenzelm@5207
  1257
'Delsimprocs [unit_eq_proc];' as last resort); also note that
wenzelm@5207
  1258
unit_abs_eta_conv is added in order to counter the effect of
wenzelm@5207
  1259
unit_eq_proc on (%u::unit. f u), replacing it by f rather than by
wenzelm@5207
  1260
%u.f();
wenzelm@5125
  1261
wenzelm@5217
  1262
* HOL/Fun INCOMPATIBILITY: `inj_onto' is now called `inj_on' (which
wenzelm@5217
  1263
makes more sense);
berghofe@5109
  1264
paulson@5475
  1265
* HOL/Set INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
  1266
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
  1267
  disjointness reasoning but breaking a few old proofs.
paulson@5267
  1268
wenzelm@5217
  1269
* HOL/Relation INCOMPATIBILITY: renamed the relational operator r^-1
wenzelm@5217
  1270
to 'converse' from 'inverse' (for compatibility with ZF and some
wenzelm@5217
  1271
literature);
wenzelm@5085
  1272
wenzelm@5127
  1273
* HOL/recdef can now declare non-recursive functions, with {} supplied as
wenzelm@5127
  1274
the well-founded relation;
oheimb@4838
  1275
paulson@5490
  1276
* HOL/Set INCOMPATIBILITY: the complement of set A is now written -A instead of
paulson@5490
  1277
    Compl A.  The "Compl" syntax remains available as input syntax for this
paulson@5490
  1278
    release ONLY.
paulson@5490
  1279
wenzelm@5127
  1280
* HOL/Update: new theory of function updates:
wenzelm@5127
  1281
    f(a:=b) == %x. if x=a then b else f x
wenzelm@5127
  1282
may also be iterated as in f(a:=b,c:=d,...);
nipkow@5077
  1283
wenzelm@5127
  1284
* HOL/Vimage: new theory for inverse image of a function, syntax f-``B;
paulson@4899
  1285
nipkow@5282
  1286
* HOL/List:
nipkow@5282
  1287
  - new function list_update written xs[i:=v] that updates the i-th
nipkow@5282
  1288
    list position. May also be iterated as in xs[i:=a,j:=b,...].
nipkow@5428
  1289
  - new function `upt' written [i..j(] which generates the list
nipkow@5428
  1290
    [i,i+1,...,j-1], i.e. the upper bound is excluded. To include the upper
nipkow@5428
  1291
    bound write [i..j], which is a shorthand for [i..j+1(].
nipkow@5282
  1292
  - new lexicographic orderings and corresponding wellfoundedness theorems.
paulson@4779
  1293
wenzelm@5127
  1294
* HOL/Arith:
wenzelm@5127
  1295
  - removed 'pred' (predecessor) function;
wenzelm@5127
  1296
  - generalized some theorems about n-1;
wenzelm@5127
  1297
  - many new laws about "div" and "mod";
wenzelm@5127
  1298
  - new laws about greatest common divisors (see theory ex/Primes);
oheimb@4766
  1299
wenzelm@5127
  1300
* HOL/Relation: renamed the relational operator r^-1 "converse"
wenzelm@4842
  1301
instead of "inverse";
wenzelm@4711
  1302
nipkow@5651
  1303
* HOL/Induct/Multiset: a theory of multisets, including the wellfoundedness
nipkow@5651
  1304
  of the multiset ordering;
nipkow@5651
  1305
wenzelm@5127
  1306
* directory HOL/Real: a construction of the reals using Dedekind cuts
nipkow@5651
  1307
  (not included by default);
nipkow@4835
  1308
wenzelm@5127
  1309
* directory HOL/UNITY: Chandy and Misra's UNITY formalism;
wenzelm@4711
  1310
nipkow@5651
  1311
* directory HOL/Hoare: a new version of Hoare logic which permits many-sorted
nipkow@5651
  1312
  programs, i.e. different program variables may have different types.
nipkow@5651
  1313
paulson@5142
  1314
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
  1315
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
  1316
  Now rew can involve either definitions or equalities (either == or =).
wenzelm@5002
  1317
wenzelm@5363
  1318
paulson@4879
  1319
*** ZF ***
paulson@4879
  1320
paulson@5332
  1321
* theory Main includes everything; INCOMPATIBILITY: theory ZF.thy contains
paulson@5332
  1322
  only the theorems proved on ZF.ML;
paulson@5160
  1323
paulson@5475
  1324
* ZF INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
  1325
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
  1326
  disjointness reasoning but breaking a few old proofs.
paulson@5267
  1327
paulson@5160
  1328
* ZF/Update: new theory of function updates
paulson@5160
  1329
    with default rewrite rule  f(x:=y) ` z = if(z=x, y, f`z)
paulson@5160
  1330
  may also be iterated as in f(a:=b,c:=d,...);
paulson@5160
  1331
paulson@4879
  1332
* in  let x=t in u(x), neither t nor u(x) has to be an FOL term.
oheimb@4649
  1333
paulson@5142
  1334
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
  1335
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
  1336
  Now rew can involve either definitions or equalities (either == or =).
paulson@5142
  1337
paulson@5160
  1338
* case_tac provided for compatibility with HOL
paulson@5160
  1339
    (like the old excluded_middle_tac, but with subgoals swapped)
paulson@5160
  1340
wenzelm@4842
  1341
wenzelm@5127
  1342
*** Internal programming interfaces ***
wenzelm@5002
  1343
wenzelm@5251
  1344
* Pure: several new basic modules made available for general use, see
wenzelm@5251
  1345
also src/Pure/README;
wenzelm@5207
  1346
wenzelm@5008
  1347
* improved the theory data mechanism to support encapsulation (data
wenzelm@5008
  1348
kind name replaced by private Object.kind, acting as authorization
wenzelm@5373
  1349
key); new type-safe user interface via functor TheoryDataFun; generic
wenzelm@5373
  1350
print_data function becomes basically useless;
wenzelm@5002
  1351
wenzelm@5251
  1352
* removed global_names compatibility flag -- all theory declarations
wenzelm@5251
  1353
are qualified by default;
wenzelm@5251
  1354
wenzelm@5085
  1355
* module Pure/Syntax now offers quote / antiquote translation
wenzelm@5085
  1356
functions (useful for Hoare logic etc. with implicit dependencies);
wenzelm@5373
  1357
see HOL/ex/Antiquote for an example use;
wenzelm@5085
  1358
wenzelm@5127
  1359
* Simplifier now offers conversions (asm_)(full_)rewrite: simpset ->
wenzelm@5127
  1360
cterm -> thm;
wenzelm@5127
  1361
wenzelm@5207
  1362
* new tactical CHANGED_GOAL for checking that a tactic modifies a
wenzelm@5207
  1363
subgoal;
paulson@5142
  1364
wenzelm@5251
  1365
* Display.print_goals function moved to Locale.print_goals;
wenzelm@5251
  1366
wenzelm@5731
  1367
* standard print function for goals supports current_goals_markers
wenzelm@5731
  1368
variable for marking begin of proof, end of proof, start of goal; the
wenzelm@5731
  1369
default is ("", "", ""); setting current_goals_markers := ("<proof>",
wenzelm@5731
  1370
"</proof>", "<goal>") causes SGML like tagged proof state printing,
wenzelm@5731
  1371
for example;
wenzelm@5731
  1372
wenzelm@5002
  1373
wenzelm@5002
  1374
wenzelm@4410
  1375
New in Isabelle98 (January 1998)
wenzelm@4410
  1376
--------------------------------
wenzelm@4410
  1377
wenzelm@4410
  1378
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4410
  1379
wenzelm@4410
  1380
* changed lexical syntax of terms / types: dots made part of long
wenzelm@4410
  1381
identifiers, e.g. "%x.x" no longer possible, should be "%x. x";
wenzelm@4410
  1382
wenzelm@4410
  1383
* simpset (and claset) reference variable replaced by functions
wenzelm@4410
  1384
simpset / simpset_ref;
wenzelm@4410
  1385
wenzelm@4410
  1386
* no longer supports theory aliases (via merge) and non-trivial
wenzelm@4410
  1387
implicit merge of thms' signatures;
wenzelm@4410
  1388
wenzelm@4410
  1389
* most internal names of constants changed due to qualified names;
wenzelm@4410
  1390
wenzelm@4410
  1391
* changed Pure/Sequence interface (see Pure/seq.ML);
wenzelm@4410
  1392
wenzelm@3454
  1393
paulson@3715
  1394
*** General Changes ***
paulson@3715
  1395
wenzelm@4174
  1396
* hierachically structured name spaces (for consts, types, axms, thms
wenzelm@3943
  1397
etc.); new lexical class 'longid' (e.g. Foo.bar.x) may render much of
wenzelm@4108
  1398
old input syntactically incorrect (e.g. "%x.x"); COMPATIBILITY:
wenzelm@4108
  1399
isatool fixdots ensures space after dots (e.g. "%x. x"); set
wenzelm@4174
  1400
long_names for fully qualified output names; NOTE: ML programs
wenzelm@4174
  1401
(special tactics, packages etc.) referring to internal names may have
wenzelm@4174
  1402
to be adapted to cope with fully qualified names; in case of severe
wenzelm@4174
  1403
backward campatibility problems try setting 'global_names' at compile
wenzelm@4174
  1404
time to have enrything declared within a flat name space; one may also
wenzelm@4174
  1405
fine tune name declarations in theories via the 'global' and 'local'
wenzelm@4174
  1406
section;
wenzelm@4108
  1407
wenzelm@4108
  1408
* reimplemented the implicit simpset and claset using the new anytype
wenzelm@4108
  1409
data filed in signatures; references simpset:simpset ref etc. are
wenzelm@4108
  1410
replaced by functions simpset:unit->simpset and
wenzelm@4108
  1411
simpset_ref:unit->simpset ref; COMPATIBILITY: use isatool fixclasimp
wenzelm@4108
  1412
to patch your ML files accordingly;
paulson@3856
  1413
wenzelm@3857
  1414
* HTML output now includes theory graph data for display with Java
wenzelm@3857
  1415
applet or isatool browser; data generated automatically via isatool
wenzelm@3901
  1416
usedir (see -i option, ISABELLE_USEDIR_OPTIONS);
wenzelm@3857
  1417
paulson@3856
  1418
* defs may now be conditional; improved rewrite_goals_tac to handle
paulson@3856
  1419
conditional equations;
paulson@3856
  1420
wenzelm@4174
  1421
* defs now admits additional type arguments, using TYPE('a) syntax;
wenzelm@4174
  1422
wenzelm@3901
  1423
* theory aliases via merge (e.g. M=A+B+C) no longer supported, always
wenzelm@3901
  1424
creates a new theory node; implicit merge of thms' signatures is
wenzelm@4112
  1425
restricted to 'trivial' ones; COMPATIBILITY: one may have to use
wenzelm@3901
  1426
transfer:theory->thm->thm in (rare) cases;
wenzelm@3901
  1427
wenzelm@3968
  1428
* improved handling of draft signatures / theories; draft thms (and
wenzelm@3968
  1429
ctyps, cterms) are automatically promoted to real ones;
wenzelm@3968
  1430
wenzelm@3901
  1431
* slightly changed interfaces for oracles: admit many per theory, named
wenzelm@3901
  1432
(e.g. oracle foo = mlfun), additional name argument for invoke_oracle;
wenzelm@3901
  1433
wenzelm@3901
  1434
* print_goals: optional output of const types (set show_consts and
wenzelm@3901
  1435
show_types);
wenzelm@3851
  1436
wenzelm@4388
  1437
* improved output of warnings (###) and errors (***);
wenzelm@3697
  1438
paulson@4178
  1439
* subgoal_tac displays a warning if the new subgoal has type variables;
paulson@4178
  1440
paulson@3715
  1441
* removed old README and Makefiles;
wenzelm@3697
  1442
paulson@3856
  1443
* replaced print_goals_ref hook by print_current_goals_fn and result_error_fn;
wenzelm@3670
  1444
paulson@3715
  1445
* removed obsolete init_pps and init_database;
paulson@3715
  1446
paulson@3715
  1447
* deleted the obsolete tactical STATE, which was declared by
paulson@3715
  1448
    fun STATE tacfun st = tacfun st st;
paulson@3715
  1449
wenzelm@4388
  1450
* cd and use now support path variables, e.g. $ISABELLE_HOME, or ~
wenzelm@4388
  1451
(which abbreviates $HOME);
wenzelm@4269
  1452
wenzelm@4269
  1453
* changed Pure/Sequence interface (see Pure/seq.ML); COMPATIBILITY:
wenzelm@4269
  1454
use isatool fixseq to adapt your ML programs (this works for fully
wenzelm@4269
  1455
qualified references to the Sequence structure only!);
wenzelm@4269
  1456
wenzelm@4381
  1457
* use_thy no longer requires writable current directory; it always
wenzelm@4381
  1458
reloads .ML *and* .thy file, if either one is out of date;
wenzelm@4269
  1459
paulson@3715
  1460
paulson@3715
  1461
*** Classical Reasoner ***
paulson@3715
  1462
wenzelm@3744
  1463
* Clarify_tac, clarify_tac, clarify_step_tac, Clarify_step_tac: new
wenzelm@3744
  1464
tactics that use classical reasoning to simplify a subgoal without
wenzelm@3744
  1465
splitting it into several subgoals;
paulson@3715
  1466
paulson@3719
  1467
* Safe_tac: like safe_tac but uses the default claset;
paulson@3719
  1468
paulson@3715
  1469
paulson@3715
  1470
*** Simplifier ***
paulson@3715
  1471
paulson@3715
  1472
* added simplification meta rules:
paulson@3715
  1473
    (asm_)(full_)simplify: simpset -> thm -> thm;
paulson@3715
  1474
paulson@3715
  1475
* simplifier.ML no longer part of Pure -- has to be loaded by object
paulson@3715
  1476
logics (again);
paulson@3715
  1477
paulson@3715
  1478
* added prems argument to simplification procedures;
paulson@3715
  1479
paulson@4325
  1480
* HOL, FOL, ZF: added infix function `addsplits':
paulson@4325
  1481
  instead of `<simpset> setloop (split_tac <thms>)'
paulson@4325
  1482
  you can simply write `<simpset> addsplits <thms>'
paulson@4325
  1483
paulson@3715
  1484
paulson@3715
  1485
*** Syntax ***
paulson@3715
  1486
wenzelm@4174
  1487
* TYPE('a) syntax for type reflection terms;
wenzelm@4174
  1488
wenzelm@3985
  1489
* no longer handles consts with name "" -- declare as 'syntax' instead;
paulson@3856
  1490
paulson@3856
  1491
* pretty printer: changed order of mixfix annotation preference (again!);
wenzelm@3846
  1492
paulson@3715
  1493
* Pure: fixed idt/idts vs. pttrn/pttrns syntactic categories;
paulson@3715
  1494
paulson@3715
  1495
paulson@3715
  1496
*** HOL ***
paulson@3715
  1497
wenzelm@5726
  1498
* HOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  1499
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
  1500
nipkow@4035
  1501
* HOL/TLA: Stephan Merz's formalization of Lamport's Temporal Logic of Actions;
wenzelm@3985
  1502
wenzelm@3985
  1503
* HOL/Auth: new protocol proofs including some for the Internet
nipkow@4035
  1504
  protocol TLS;
wenzelm@3985
  1505
wenzelm@4125
  1506
* HOL/Map: new theory of `maps' a la VDM;
nipkow@3982
  1507
wenzelm@4335
  1508
* HOL/simplifier: simplification procedures nat_cancel_sums for
wenzelm@4335
  1509
cancelling out common nat summands from =, <, <= (in)equalities, or
wenzelm@4335
  1510
differences; simplification procedures nat_cancel_factor for
wenzelm@4335
  1511
cancelling common factor from =, <, <= (in)equalities over natural
wenzelm@4373
  1512
sums; nat_cancel contains both kinds of procedures, it is installed by
wenzelm@4373
  1513
default in Arith.thy -- this COULD MAKE EXISTING PROOFS FAIL;
wenzelm@4335
  1514
nipkow@3580
  1515
* HOL/simplifier: terms of the form
paulson@4325
  1516
  `? x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x)'  (or t=x)
nipkow@3580
  1517
  are rewritten to
nipkow@4035
  1518
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t)',
nipkow@4035
  1519
  and those of the form
paulson@4325
  1520
  `! x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x) --> R(x)'  (or t=x)
nipkow@4035
  1521
  are rewritten to
nipkow@4035
  1522
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t) --> R(t)',
nipkow@4035
  1523
nipkow@4035
  1524
* HOL/datatype
nipkow@4035
  1525
  Each datatype `t' now comes with a theorem `split_t_case' of the form
nipkow@3580
  1526
nipkow@4035
  1527
  P(t_case f1 ... fn x) =
nipkow@4035
  1528
     ( (!y1 ... ym1. x = C1 y1 ... ym1 --> P(f1 y1 ... ym1)) &
nipkow@4035
  1529
        ...
oheimb@4189
  1530
       (!y1 ... ymn. x = Cn y1 ... ymn --> P(f1 y1 ... ymn))
nipkow@4035
  1531
     )
nipkow@4035
  1532
oheimb@4930
  1533
  and a theorem `split_t_case_asm' of the form
oheimb@4189
  1534
oheimb@4189
  1535
  P(t_case f1 ... fn x) =
oheimb@4189
  1536
    ~( (? y1 ... ym1. x = C1 y1 ... ym1 & ~P(f1 y1 ... ym1)) |
oheimb@4189
  1537
        ...
oheimb@4189
  1538
       (? y1 ... ymn. x = Cn y1 ... ymn & ~P(f1 y1 ... ymn))
oheimb@4189
  1539
     )
oheimb@4930
  1540
  which can be added to a simpset via `addsplits'. The existing theorems
oheimb@4930
  1541
  expand_list_case and expand_option_case have been renamed to
oheimb@4930
  1542
  split_list_case and split_option_case.
oheimb@4189
  1543
nipkow@4361
  1544
* HOL/Arithmetic:
nipkow@4361
  1545
  - `pred n' is automatically converted to `n-1'.
nipkow@4361
  1546
    Users are strongly encouraged not to use `pred' any longer,
nipkow@4361
  1547
    because it will disappear altogether at some point.
nipkow@4361
  1548
  - Users are strongly encouraged to write "0 < n" rather than
nipkow@4361
  1549
    "n ~= 0". Theorems and proof tools have been modified towards this
nipkow@4361
  1550
    `standard'.
nipkow@4357
  1551
nipkow@4502
  1552
* HOL/Lists:
nipkow@4502
  1553
  the function "set_of_list" has been renamed "set" (and its theorems too);
nipkow@4502
  1554
  the function "nth" now takes its arguments in the reverse order and
nipkow@4502
  1555
  has acquired the infix notation "!" as in "xs!n".
paulson@3570
  1556
paulson@4154
  1557
* HOL/Set: UNIV is now a constant and is no longer translated to Compl{};
paulson@4154
  1558
paulson@4154
  1559
* HOL/Set: The operator (UN x.B x) now abbreviates (UN x:UNIV. B x) and its
paulson@4154
  1560
  specialist theorems (like UN1_I) are gone.  Similarly for (INT x.B x);
paulson@4154
  1561
wenzelm@4575
  1562
* HOL/record: extensible records with schematic structural subtyping
wenzelm@4575
  1563
(single inheritance); EXPERIMENTAL version demonstrating the encoding,
wenzelm@4575
  1564
still lacks various theorems and concrete record syntax;
wenzelm@4575
  1565
wenzelm@4125
  1566
paulson@3715
  1567
*** HOLCF ***
wenzelm@3535
  1568
wenzelm@4125
  1569
* removed "axioms" and "generated by" sections;
wenzelm@4125
  1570
oheimb@4123
  1571
* replaced "ops" section by extended "consts" section, which is capable of
wenzelm@4125
  1572
  handling the continuous function space "->" directly;
wenzelm@4125
  1573
wenzelm@4125
  1574
* domain package:
wenzelm@4125
  1575
  . proves theorems immediately and stores them in the theory,
wenzelm@4125
  1576
  . creates hierachical name space,
wenzelm@4125
  1577
  . now uses normal mixfix annotations (instead of cinfix...),
wenzelm@4125
  1578
  . minor changes to some names and values (for consistency),
wenzelm@4125
  1579
  . e.g. cases -> casedist, dists_eq -> dist_eqs, [take_lemma] -> take_lemmas,
wenzelm@4125
  1580
  . separator between mutual domain defs: changed "," to "and",
wenzelm@4125
  1581
  . improved handling of sort constraints;  now they have to
wenzelm@4125
  1582
    appear on the left-hand side of the equations only;
oheimb@4123
  1583
oheimb@4123
  1584
* fixed LAM <x,y,zs>.b syntax;
wenzelm@3567
  1585
wenzelm@3744
  1586
* added extended adm_tac to simplifier in HOLCF -- can now discharge
wenzelm@3744
  1587
adm (%x. P (t x)), where P is chainfinite and t continuous;
wenzelm@3579
  1588
wenzelm@3579
  1589
paulson@3719
  1590
*** FOL and ZF ***
paulson@3719
  1591
wenzelm@5726
  1592
* FOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  1593
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
  1594
wenzelm@3744
  1595
* qed_spec_mp, qed_goal_spec_mp, qed_goalw_spec_mp are available, as
wenzelm@3744
  1596
in HOL, they strip ALL and --> from proved theorems;
wenzelm@3744
  1597
paulson@3719
  1598
wenzelm@3579
  1599
wenzelm@3006
  1600
New in Isabelle94-8 (May 1997)
wenzelm@3006
  1601
------------------------------
wenzelm@2654
  1602
paulson@3002
  1603
*** General Changes ***
paulson@3002
  1604
paulson@3002
  1605
* new utilities to build / run / maintain Isabelle etc. (in parts
paulson@3002
  1606
still somewhat experimental); old Makefiles etc. still functional;
wenzelm@2971
  1607
wenzelm@3205
  1608
* new 'Isabelle System Manual';
wenzelm@3205
  1609
wenzelm@2825
  1610
* INSTALL text, together with ./configure and ./build scripts;
wenzelm@2773
  1611
wenzelm@3006
  1612
* reimplemented type inference for greater efficiency, better error
wenzelm@3006
  1613
messages and clean internal interface;
paulson@3002
  1614
paulson@3002
  1615
* prlim command for dealing with lots of subgoals (an easier way of
paulson@3002
  1616
setting goals_limit);
paulson@3002
  1617
wenzelm@3006
  1618
wenzelm@3006
  1619
*** Syntax ***
paulson@3002
  1620
wenzelm@3116
  1621
* supports alternative (named) syntax tables (parser and pretty
wenzelm@3116
  1622
printer); internal interface is provided by add_modesyntax(_i);
wenzelm@3116
  1623
paulson@3002
  1624
* Pure, FOL, ZF, HOL, HOLCF now support symbolic input and output; to
paulson@3002
  1625
be used in conjunction with the Isabelle symbol font; uses the
paulson@3002
  1626
"symbols" syntax table;
paulson@3002
  1627
wenzelm@2705
  1628
* added token_translation interface (may translate name tokens in
wenzelm@2756
  1629
arbitrary ways, dependent on their type (free, bound, tfree, ...) and
wenzelm@3116
  1630
the current print_mode); IMPORTANT: user print translation functions
wenzelm@3116
  1631
are responsible for marking newly introduced bounds
wenzelm@3116
  1632
(Syntax.mark_boundT);
wenzelm@2705
  1633
wenzelm@2730
  1634
* token translations for modes "xterm" and "xterm_color" that display
wenzelm@3006
  1635
names in bold, underline etc. or colors (which requires a color
wenzelm@3006
  1636
version of xterm);
wenzelm@2730
  1637
paulson@3002
  1638
* infixes may now be declared with names independent of their syntax;
paulson@3002
  1639
paulson@3002
  1640
* added typed_print_translation (like print_translation, but may
paulson@3002
  1641
access type of constant);
paulson@3002
  1642
wenzelm@3006
  1643
paulson@3002
  1644
*** Classical Reasoner ***
paulson@3002
  1645
paulson@3002
  1646
Blast_tac: a new tactic!  It is often more powerful than fast_tac, but has
paulson@3002
  1647
some limitations.  Blast_tac...
paulson@3002
  1648
  + ignores addss, addbefore, addafter; this restriction is intrinsic
paulson@3002
  1649
  + ignores elimination rules that don't have the correct format
wenzelm@5726
  1650
        (the conclusion MUST be a formula variable)
paulson@3002
  1651
  + ignores types, which can make HOL proofs fail
paulson@3002
  1652
  + rules must not require higher-order unification, e.g. apply_type in ZF
paulson@3002
  1653
    [message "Function Var's argument not a bound variable" relates to this]
paulson@3002
  1654
  + its proof strategy is more general but can actually be slower
paulson@3002
  1655
wenzelm@3107
  1656
* substitution with equality assumptions no longer permutes other
wenzelm@3107
  1657
assumptions;
paulson@3002
  1658
paulson@3002
  1659
* minor changes in semantics of addafter (now called addaltern); renamed
paulson@3002
  1660
setwrapper to setWrapper and compwrapper to compWrapper; added safe wrapper
wenzelm@3107
  1661
(and access functions for it);
paulson@3002
  1662
wenzelm@5726
  1663
* improved combination of classical reasoner and simplifier:
oheimb@3317
  1664
  + functions for handling clasimpsets
oheimb@3317
  1665
  + improvement of addss: now the simplifier is called _after_ the
oheimb@3317
  1666
    safe steps.
oheimb@3317
  1667
  + safe variant of addss called addSss: uses safe simplifications
wenzelm@5726
  1668
    _during_ the safe steps. It is more complete as it allows multiple
oheimb@3317
  1669
    instantiations of unknowns (e.g. with slow_tac).
wenzelm@3006
  1670
paulson@3002
  1671
*** Simplifier ***
paulson@3002
  1672
wenzelm@3006
  1673
* added interface for simplification procedures (functions that
wenzelm@3006
  1674
produce *proven* rewrite rules on the fly, depending on current
wenzelm@3006
  1675
redex);
wenzelm@3006
  1676
wenzelm@3006
  1677
* ordering on terms as parameter (used for ordered rewriting);
wenzelm@3006
  1678
wenzelm@3107
  1679
* new functions delcongs, deleqcongs, and Delcongs. richer rep_ss;
paulson@3002
  1680
paulson@3002
  1681
* the solver is now split into a safe and an unsafe part.
paulson@3002
  1682
This should be invisible for the normal user, except that the
paulson@3002
  1683
functions setsolver and addsolver have been renamed to setSolver and
wenzelm@3107
  1684
addSolver; added safe_asm_full_simp_tac;
paulson@3002
  1685
paulson@3002
  1686
paulson@3002
  1687
*** HOL ***
paulson@3002
  1688
nipkow@3042
  1689
* a generic induction tactic `induct_tac' which works for all datatypes and
wenzelm@3107
  1690
also for type `nat';
nipkow@3042
  1691
nipkow@3316
  1692
* a generic case distinction tactic `exhaust_tac' which works for all
nipkow@3316
  1693
datatypes and also for type `nat';
nipkow@3316
  1694
nipkow@3316
  1695
* each datatype comes with a function `size';
nipkow@3316
  1696
paulson@3002
  1697
* patterns in case expressions allow tuple patterns as arguments to
wenzelm@3107
  1698
constructors, for example `case x of [] => ... | (x,y,z)#ps => ...';
paulson@3002
  1699
paulson@3002
  1700
* primrec now also works with type nat;
paulson@3002
  1701
paulson@3338
  1702
* recdef: a new declaration form, allows general recursive functions to be
paulson@3338
  1703
defined in theory files.  See HOL/ex/Fib, HOL/ex/Primes, HOL/Subst/Unify.
paulson@3338
  1704
paulson@3002
  1705
* the constant for negation has been renamed from "not" to "Not" to
wenzelm@3107
  1706
harmonize with FOL, ZF, LK, etc.;
paulson@3002
  1707
wenzelm@3107
  1708
* HOL/ex/LFilter theory of a corecursive "filter" functional for
wenzelm@3107
  1709
infinite lists;
paulson@3002
  1710
wenzelm@3227
  1711
* HOL/Modelcheck demonstrates invocation of model checker oracle;
wenzelm@3227
  1712
paulson@3002
  1713
* HOL/ex/Ring.thy declares cring_simp, which solves equational
paulson@3002
  1714
problems in commutative rings, using axiomatic type classes for + and *;
paulson@3002
  1715
paulson@3002
  1716
* more examples in HOL/MiniML and HOL/Auth;
paulson@3002
  1717
paulson@3002
  1718
* more default rewrite rules for quantifiers, union/intersection;
paulson@3002
  1719
nipkow@3321
  1720
* a new constant `arbitrary == @x.False';
nipkow@3321
  1721
wenzelm@3107
  1722
* HOLCF/IOA replaces old HOL/IOA;
wenzelm@3107
  1723
wenzelm@5726
  1724
* HOLCF changes: derived all rules and arities
wenzelm@5726
  1725
  + axiomatic type classes instead of classes
slotosch@2653
  1726
  + typedef instead of faking type definitions
paulson@2747
  1727
  + eliminated the internal constants less_fun, less_cfun, UU_fun, UU_cfun etc.
wenzelm@2730
  1728
  + new axclasses cpo, chfin, flat with flat < chfin < pcpo < cpo < po
slotosch@2653
  1729
  + eliminated the types void, one, tr
slotosch@2653
  1730
  + use unit lift and bool lift (with translations) instead of one and tr
slotosch@2653
  1731
  + eliminated blift from Lift3.thy (use Def instead of blift)
wenzelm@3107
  1732
  all eliminated rules are derived as theorems --> no visible changes ;
oheimb@2649
  1733
wenzelm@3006
  1734
paulson@3002
  1735
*** ZF ***
wenzelm@2553
  1736
paulson@2865
  1737
* ZF now has Fast_tac, Simp_tac and Auto_tac.  Union_iff is a now a default
paulson@2865
  1738
rewrite rule; this may affect some proofs.  eq_cs is gone but can be put back
paulson@2865
  1739
as ZF_cs addSIs [equalityI];
wenzelm@2553
  1740
wenzelm@2554
  1741
wenzelm@2732
  1742
wenzelm@2553
  1743
New in Isabelle94-7 (November 96)
wenzelm@2553
  1744
---------------------------------
wenzelm@2553
  1745
wenzelm@2553
  1746
* allowing negative levels (as offsets) in prlev and choplev;
wenzelm@2553
  1747
wenzelm@2554
  1748
* super-linear speedup for large simplifications;
wenzelm@2554
  1749
wenzelm@2554
  1750
* FOL, ZF and HOL now use miniscoping: rewriting pushes
wenzelm@2554
  1751
quantifications in as far as possible (COULD MAKE EXISTING PROOFS
wenzelm@2554
  1752
FAIL); can suppress it using the command Delsimps (ex_simps @
wenzelm@2554
  1753
all_simps); De Morgan laws are also now included, by default;
wenzelm@2554
  1754
wenzelm@2554
  1755
* improved printing of ==>  :  ~:
wenzelm@2554
  1756
wenzelm@2554
  1757
* new object-logic "Sequents" adds linear logic, while replacing LK
wenzelm@2554
  1758
and Modal (thanks to Sara Kalvala);
wenzelm@2554
  1759
wenzelm@2554
  1760
* HOL/Auth: correctness proofs for authentication protocols;
wenzelm@2554
  1761
wenzelm@2554
  1762
* HOL: new auto_tac combines rewriting and classical reasoning (many
wenzelm@2554
  1763
examples on HOL/Auth);
wenzelm@2554
  1764
wenzelm@2554
  1765
* HOL: new command AddIffs for declaring theorems of the form P=Q to
wenzelm@2554
  1766
the rewriter and classical reasoner simultaneously;
wenzelm@2554
  1767
wenzelm@2554
  1768
* function uresult no longer returns theorems in "standard" format;
wenzelm@2554
  1769
regain previous version by: val uresult = standard o uresult;
wenzelm@2554
  1770
wenzelm@2554
  1771
wenzelm@2554
  1772
wenzelm@2554
  1773
New in Isabelle94-6
wenzelm@2554
  1774
-------------------
wenzelm@2554
  1775
wenzelm@2554
  1776
* oracles -- these establish an interface between Isabelle and trusted
wenzelm@2554
  1777
external reasoners, which may deliver results as theorems;
wenzelm@2554
  1778
wenzelm@2554
  1779
* proof objects (in particular record all uses of oracles);
wenzelm@2554
  1780
wenzelm@2554
  1781
* Simp_tac, Fast_tac, etc. that refer to implicit simpset / claset;
wenzelm@2554
  1782
wenzelm@2554
  1783
* "constdefs" section in theory files;
wenzelm@2554
  1784
wenzelm@2554
  1785
* "primrec" section (HOL) no longer requires names;
wenzelm@2554
  1786
wenzelm@2554
  1787
* internal type "tactic" now simply "thm -> thm Sequence.seq";
wenzelm@2554
  1788
wenzelm@2554
  1789
wenzelm@2554
  1790
wenzelm@2554
  1791
New in Isabelle94-5
wenzelm@2554
  1792
-------------------
wenzelm@2554
  1793
wenzelm@2554
  1794
* reduced space requirements;
wenzelm@2554
  1795
wenzelm@2554
  1796
* automatic HTML generation from theories;
wenzelm@2554
  1797
wenzelm@2554
  1798
* theory files no longer require "..." (quotes) around most types;
wenzelm@2554
  1799
wenzelm@2554
  1800
* new examples, including two proofs of the Church-Rosser theorem;
wenzelm@2554
  1801
wenzelm@2554
  1802
* non-curried (1994) version of HOL is no longer distributed;
wenzelm@2554
  1803
wenzelm@2553
  1804
paulson@2557
  1805
paulson@2557
  1806
New in Isabelle94-4
paulson@2557
  1807
-------------------
paulson@2557
  1808
paulson@2747
  1809
* greatly reduced space requirements;
paulson@2557
  1810
paulson@2557
  1811
* theory files (.thy) no longer require \...\ escapes at line breaks;
paulson@2557
  1812
wenzelm@5726
  1813
* searchable theorem database (see the section "Retrieving theorems" on
paulson@2557
  1814
page 8 of the Reference Manual);
paulson@2557
  1815
paulson@2557
  1816
* new examples, including Grabczewski's monumental case study of the
paulson@2557
  1817
Axiom of Choice;
paulson@2557
  1818
paulson@2557
  1819
* The previous version of HOL renamed to Old_HOL;
paulson@2557
  1820
wenzelm@5726
  1821
* The new version of HOL (previously called CHOL) uses a curried syntax
paulson@2557
  1822
for functions.  Application looks like f a b instead of f(a,b);
paulson@2557
  1823
paulson@2557
  1824
* Mutually recursive inductive definitions finally work in HOL;
paulson@2557
  1825
paulson@2557
  1826
* In ZF, pattern-matching on tuples is now available in all abstractions and
paulson@2557
  1827
translates to the operator "split";
paulson@2557
  1828
paulson@2557
  1829
paulson@2557
  1830
paulson@2557
  1831
New in Isabelle94-3
paulson@2557
  1832
-------------------
paulson@2557
  1833
wenzelm@5726
  1834
* new infix operator, addss, allowing the classical reasoner to
paulson@2557
  1835
perform simplification at each step of its search.  Example:
wenzelm@5726
  1836
        fast_tac (cs addss ss)
paulson@2557
  1837
wenzelm@5726
  1838
* a new logic, CHOL, the same as HOL, but with a curried syntax
wenzelm@5726
  1839
for functions.  Application looks like f a b instead of f(a,b).  Also pairs
paulson@2557
  1840
look like (a,b) instead of <a,b>;
paulson@2557
  1841
paulson@2557
  1842
* PLEASE NOTE: CHOL will eventually replace HOL!
paulson@2557
  1843
paulson@2557
  1844
* In CHOL, pattern-matching on tuples is now available in all abstractions.
paulson@2557
  1845
It translates to the operator "split".  A new theory of integers is available;
paulson@2557
  1846
paulson@2557
  1847
* In ZF, integer numerals now denote two's-complement binary integers.
paulson@2557
  1848
Arithmetic operations can be performed by rewriting.  See ZF/ex/Bin.ML;
paulson@2557
  1849
wenzelm@5726
  1850
* Many new examples: I/O automata, Church-Rosser theorem, equivalents
paulson@2557
  1851
of the Axiom of Choice;
paulson@2557
  1852
paulson@2557
  1853
paulson@2557
  1854
paulson@2557
  1855
New in Isabelle94-2
paulson@2557
  1856
-------------------
paulson@2557
  1857
wenzelm@5726
  1858
* Significantly faster resolution;
paulson@2557
  1859
paulson@2557
  1860
* the different sections in a .thy file can now be mixed and repeated
paulson@2557
  1861
freely;
paulson@2557
  1862
paulson@2557
  1863
* Database of theorems for FOL, HOL and ZF.  New
paulson@2557
  1864
commands including qed, qed_goal and bind_thm store theorems in the database.
paulson@2557
  1865
paulson@2557
  1866
* Simple database queries: return a named theorem (get_thm) or all theorems of
paulson@2557
  1867
a given theory (thms_of), or find out what theory a theorem was proved in
paulson@2557
  1868
(theory_of_thm);
paulson@2557
  1869
paulson@2557
  1870
* Bugs fixed in the inductive definition and datatype packages;
paulson@2557
  1871
paulson@2557
  1872
* The classical reasoner provides deepen_tac and depth_tac, making FOL_dup_cs
paulson@2557
  1873
and HOL_dup_cs obsolete;
paulson@2557
  1874
paulson@2557
  1875
* Syntactic ambiguities caused by the new treatment of syntax in Isabelle94-1
paulson@2557
  1876
have been removed;
paulson@2557
  1877
paulson@2557
  1878
* Simpler definition of function space in ZF;
paulson@2557
  1879
paulson@2557
  1880
* new results about cardinal and ordinal arithmetic in ZF;
paulson@2557
  1881
paulson@2557
  1882
* 'subtype' facility in HOL for introducing new types as subsets of existing
paulson@2557
  1883
types;
paulson@2557
  1884
paulson@2557
  1885
wenzelm@2553
  1886
$Id$