NEWS
author paulson
Mon May 05 18:34:16 2003 +0200 (2003-05-05)
changeset 13960 70f9158b6695
parent 13954 2e989faba65a
child 13966 2160abf7cfe7
permissions -rw-r--r--
Complex, etc
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Isabelle NEWS -- history user-relevant changes
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==============================================
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New in this Isabelle release
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----------------------------
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*** General ***
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* Provers/simplifier:
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  - Completely reimplemented method simp (ML: Asm_full_simp_tac):
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    Assumptions are now subject to complete mutual simplification,
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    not just from left to right. The simplifier now preserves
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    the order of assumptions.
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    Potential INCOMPATIBILITY:
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    -- simp sometimes diverges where the old version did
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       not, e.g. invoking simp on the goal
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        [| P (f x); y = x; f x = f y |] ==> Q
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       now gives rise to the infinite reduction sequence
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        P(f x) --(f x = f y)--> P(f y) --(y = x)--> P(f x) --(f x = f y)--> ...
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       Using "simp (asm_lr)" (ML: Asm_lr_simp_tac) instead often solves this
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       kind of problem.
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    -- Tactics combining classical reasoner and simplification (such as auto)
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       are also affected by this change, because many of them rely on
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       simp. They may sometimes diverge as well or yield a different numbers
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       of subgoals. Try to use e.g. force, fastsimp, or safe instead of auto
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       in case of problems. Sometimes subsequent calls to the classical
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       reasoner will fail because a preceeding call to the simplifier too
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       eagerly simplified the goal, e.g. deleted redundant premises.
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  - The simplifier trace now shows the names of the applied rewrite rules
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  - You can limit the number of recursive invocations of the simplifier
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    during conditional rewriting (where the simplifie tries to solve the
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    conditions before applying the rewrite rule):
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    ML "simp_depth_limit := n"
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    where n is an integer. Thus you can force termination where previously
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    the simplifier would diverge.
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  - Accepts free variables as head terms in congruence rules.  Useful in Isar.
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  - No longer aborts on failed congruence proof.  Instead, the
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    congruence is ignored.
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* Pure: The main goal of the proof state is no longer shown by default, only
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the subgoals. This behaviour is controlled by a new flag.
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   PG menu: Isabelle/Isar -> Settings -> Show Main Goal
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(ML: Proof.show_main_goal).
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* Pure: You can find all matching introduction rules for subgoal 1, i.e. all
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rules whose conclusion matches subgoal 1:
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      PG menu: Isabelle/Isar -> Show me -> matching rules
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The rules are ordered by how closely they match the subgoal.
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In particular, rules that solve a subgoal outright are displayed first
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(or rather last, the way they are printed).
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(ML: ProofGeneral.print_intros())
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* Pure: New flag trace_unify_fail causes unification to print
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diagnostic information (PG: in trace buffer) when it fails. This is
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useful for figuring out why single step proofs like rule, erule or
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assumption failed.
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* Pure: Locale specifications now produce predicate definitions
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according to the body of text (covering assumptions modulo local
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definitions); predicate "loc_axioms" covers newly introduced text,
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while "loc" is cumulative wrt. all included locale expressions; the
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latter view is presented only on export into the global theory
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context; potential INCOMPATIBILITY, use "(open)" option to fall back
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on the old view without predicates;
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* Pure: predefined locales "var" and "struct" are useful for sharing
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parameters (as in CASL, for example); just specify something like
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``var x + var y + struct M'' as import;
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* Pure: improved thms_containing: proper indexing of facts instead of
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raw theorems; check validity of results wrt. current name space;
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include local facts of proof configuration (also covers active
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locales), cover fixed variables in index; may use "_" in term
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specification; an optional limit for the number of printed facts may
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be given (the default is 40);
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* Pure: disallow duplicate fact bindings within new-style theory files
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(batch-mode only);
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* Provers: improved induct method: assumptions introduced by case
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"foo" are split into "foo.hyps" (from the rule) and "foo.prems" (from
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the goal statement); "foo" still refers to all facts collectively;
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* Provers: the function blast.overloaded has been removed: all constants
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are regarded as potentially overloaded, which improves robustness in exchange
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for slight decrease in efficiency;
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* Provers/linorder: New generic prover for transitivity reasoning over
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linear orders.  Note: this prover is not efficient!
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* Isar: preview of problems to finish 'show' now produce an error
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rather than just a warning (in interactive mode);
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*** HOL ***
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* arith(_tac)
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 - Produces a counter example if it cannot prove a goal.
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   Note that the counter example may be spurious if the goal is not a formula
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   of quantifier-free linear arithmetic.
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   In ProofGeneral the counter example appears in the trace buffer.
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 - Knows about div k and mod k where k is a numeral of type nat or int.
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 - Calls full Presburger arithmetic (by Amine Chaieb) if quantifier-free
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   linear arithmetic fails. This takes account of quantifiers and divisibility.
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   Presburger arithmetic can also be called explicitly via presburger(_tac). 
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* simp's arithmetic capabilities have been enhanced a bit: it now
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takes ~= in premises into account (by performing a case split);
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* simp reduces "m*(n div m) + n mod m" to n, even if the two summands
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are distributed over a sum of terms;
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* New tactic "trans_tac" and method "trans" instantiate
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Provers/linorder.ML for axclasses "order" and "linorder" (predicates
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"<=", "<" and "="). 
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* function INCOMPATIBILITIES: Pi-sets have been redefined and moved from main 
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HOL to Library/FuncSet; constant "Fun.op o" is now called "Fun.comp";
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* 'typedef' command has new option "open" to suppress the set
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definition;
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* functions Min and Max on finite sets have been introduced (theory
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Finite_Set);
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* attribute [symmetric] now works for relations as well; it turns
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(x,y) : R^-1 into (y,x) : R, and vice versa;
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* induct over a !!-quantified statement (say !!x1..xn):
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  each "case" automatically performs "fix x1 .. xn" with exactly those names.
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* Map: `empty' is no longer a constant but a syntactic abbreviation for
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%x. None. Warning: empty_def now refers to the previously hidden definition
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of the empty set.
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* Algebra: contains a new formalization of group theory, using locales with
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implicit structures.  Also a new, experimental summation operator for
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abelian groups;
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* Complex: new directory of the complex numbers with numeric constants, nonstandard complex numbers, and some complex analysis, standard and nonstandard (Jacques Fleuriot);
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* GroupTheory: deleted, since its material has been moved to Algebra;
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* Hyperreal: introduced Gauge integration and hyperreal logarithms (Jacques Fleuriot);
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* Real/HahnBanach: updated and adapted to locales;
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* NumberTheory: added Gauss's law of quadratic reciprocity (by Avigad, Gray and
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Kramer);
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* UNITY: added the Meier-Sanders theory of progress sets;
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*** ZF ***
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* ZF/Constructible: consistency proof for AC (Gödel's constructible
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universe, etc.);
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* Main ZF: virtually all theories converted to new-style format;
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*** ML ***
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* Pure: Tactic.prove provides sane interface for internal proofs;
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omits the infamous "standard" operation, so this is more appropriate
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than prove_goalw_cterm in many situations (e.g. in simprocs);
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* Pure: improved error reporting of simprocs;
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* Provers: Simplifier.simproc(_i) provides sane interface for setting
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up simprocs;
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*** Document preparation ***
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* uses \par instead of \\ for line breaks in theory text. This may
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shift some page breaks in large documents. To get the old behaviour
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use \renewcommand{\isanewline}{\mbox{}\\\mbox{}} in root.tex.
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* minimized dependencies of isabelle.sty and isabellesym.sty on 
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other packages
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* \<euro> now needs package babel/greek instead of marvosym (which
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broke \Rightarrow)
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* normal size for \<zero>...\<nine> (uses \mathbf instead of 
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textcomp package)
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New in Isabelle2002 (March 2002)
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--------------------------------
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*** Document preparation ***
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* greatly simplified document preparation setup, including more
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graceful interpretation of isatool usedir -i/-d/-D options, and more
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instructive isatool mkdir; users should basically be able to get
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started with "isatool mkdir HOL Test && isatool make"; alternatively,
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users may run a separate document processing stage manually like this:
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"isatool usedir -D output HOL Test && isatool document Test/output";
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* theory dependency graph may now be incorporated into documents;
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isatool usedir -g true will produce session_graph.eps/.pdf for use
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with \includegraphics of LaTeX;
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* proper spacing of consecutive markup elements, especially text
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blocks after section headings;
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* support bold style (for single symbols only), input syntax is like
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this: "\<^bold>\<alpha>" or "\<^bold>A";
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* \<bullet> is now output as bold \cdot by default, which looks much
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better in printed text;
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* added default LaTeX bindings for \<tturnstile> and \<TTurnstile>;
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note that these symbols are currently unavailable in Proof General /
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X-Symbol; new symbols \<zero>, \<one>, ..., \<nine>, and \<euro>;
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* isatool latex no longer depends on changed TEXINPUTS, instead
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isatool document copies the Isabelle style files to the target
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location;
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*** Isar ***
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* Pure/Provers: improved proof by cases and induction;
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  - 'case' command admits impromptu naming of parameters (such as
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    "case (Suc n)");
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  - 'induct' method divinates rule instantiation from the inductive
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    claim; no longer requires excessive ?P bindings for proper
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    instantiation of cases;
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  - 'induct' method properly enumerates all possibilities of set/type
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    rules; as a consequence facts may be also passed through *type*
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    rules without further ado;
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  - 'induct' method now derives symbolic cases from the *rulified*
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    rule (before it used to rulify cases stemming from the internal
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    atomized version); this means that the context of a non-atomic
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    statement becomes is included in the hypothesis, avoiding the
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    slightly cumbersome show "PROP ?case" form;
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  - 'induct' may now use elim-style induction rules without chaining
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    facts, using ``missing'' premises from the goal state; this allows
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    rules stemming from inductive sets to be applied in unstructured
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    scripts, while still benefitting from proper handling of non-atomic
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    statements; NB: major inductive premises need to be put first, all
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    the rest of the goal is passed through the induction;
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  - 'induct' proper support for mutual induction involving non-atomic
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    rule statements (uses the new concept of simultaneous goals, see
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    below);
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  - append all possible rule selections, but only use the first
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    success (no backtracking);
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  - removed obsolete "(simplified)" and "(stripped)" options of methods;
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  - undeclared rule case names default to numbers 1, 2, 3, ...;
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  - added 'print_induct_rules' (covered by help item in recent Proof
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    General versions);
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  - moved induct/cases attributes to Pure, methods to Provers;
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  - generic method setup instantiated for FOL and HOL;
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* Pure: support multiple simultaneous goal statements, for example
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"have a: A and b: B" (same for 'theorem' etc.); being a pure
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meta-level mechanism, this acts as if several individual goals had
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been stated separately; in particular common proof methods need to be
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repeated in order to cover all claims; note that a single elimination
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step is *not* sufficient to establish the two conjunctions, so this
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fails:
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  assume "A & B" then have A and B ..   (*".." fails*)
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better use "obtain" in situations as above; alternative refer to
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multi-step methods like 'auto', 'simp_all', 'blast+' etc.;
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* Pure: proper integration with ``locales''; unlike the original
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version by Florian Kammüller, Isar locales package high-level proof
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contexts rather than raw logical ones (e.g. we admit to include
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attributes everywhere); operations on locales include merge and
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rename; support for implicit arguments (``structures''); simultaneous
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type-inference over imports and text; see also HOL/ex/Locales.thy for
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some examples;
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* Pure: the following commands have been ``localized'', supporting a
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target locale specification "(in name)": 'lemma', 'theorem',
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'corollary', 'lemmas', 'theorems', 'declare'; the results will be
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stored both within the locale and at the theory level (exported and
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qualified by the locale name);
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* Pure: theory goals may now be specified in ``long'' form, with
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ad-hoc contexts consisting of arbitrary locale elements. for example
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``lemma foo: fixes x assumes "A x" shows "B x"'' (local syntax and
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definitions may be given, too); the result is a meta-level rule with
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the context elements being discharged in the obvious way;
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* Pure: new proof command 'using' allows to augment currently used
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facts after a goal statement ('using' is syntactically analogous to
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'apply', but acts on the goal's facts only); this allows chained facts
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to be separated into parts given before and after a claim, as in
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``from a and b have C using d and e <proof>'';
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* Pure: renamed "antecedent" case to "rule_context";
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* Pure: new 'judgment' command records explicit information about the
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object-logic embedding (used by several tools internally); no longer
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use hard-wired "Trueprop";
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* Pure: added 'corollary' command;
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* Pure: fixed 'token_translation' command;
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* Pure: removed obsolete 'exported' attribute;
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* Pure: dummy pattern "_" in is/let is now automatically lifted over
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bound variables: "ALL x. P x --> Q x" (is "ALL x. _ --> ?C x")
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supersedes more cumbersome ... (is "ALL x. _ x --> ?C x");
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* Pure: method 'atomize' presents local goal premises as object-level
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statements (atomic meta-level propositions); setup controlled via
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rewrite rules declarations of 'atomize' attribute; example
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application: 'induct' method with proper rule statements in improper
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proof *scripts*;
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* Pure: emulation of instantiation tactics (rule_tac, cut_tac, etc.)
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now consider the syntactic context of assumptions, giving a better
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chance to get type-inference of the arguments right (this is
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especially important for locales);
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* Pure: "sorry" no longer requires quick_and_dirty in interactive
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mode;
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* Pure/obtain: the formal conclusion "thesis", being marked as
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``internal'', may no longer be reference directly in the text;
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potential INCOMPATIBILITY, may need to use "?thesis" in rare
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situations;
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* Pure: generic 'sym' attribute which declares a rule both as pure
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'elim?' and for the 'symmetric' operation;
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* Pure: marginal comments ``--'' may now occur just anywhere in the
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text; the fixed correlation with particular command syntax has been
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discontinued;
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berghofe@13023
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* Pure: new method 'rules' is particularly well-suited for proof
berghofe@13023
   355
search in intuitionistic logic; a bit slower than 'blast' or 'fast',
berghofe@13023
   356
but often produces more compact proof terms with less detours;
berghofe@13023
   357
wenzelm@12364
   358
* Pure/Provers/classical: simplified integration with pure rule
wenzelm@12364
   359
attributes and methods; the classical "intro?/elim?/dest?"
wenzelm@12364
   360
declarations coincide with the pure ones; the "rule" method no longer
wenzelm@12364
   361
includes classically swapped intros; "intro" and "elim" methods no
wenzelm@12364
   362
longer pick rules from the context; also got rid of ML declarations
wenzelm@12364
   363
AddXIs/AddXEs/AddXDs; all of this has some potential for
wenzelm@12364
   364
INCOMPATIBILITY;
wenzelm@12364
   365
wenzelm@12405
   366
* Provers/classical: attribute 'swapped' produces classical inversions
wenzelm@12405
   367
of introduction rules;
wenzelm@12405
   368
wenzelm@12364
   369
* Provers/simplifier: 'simplified' attribute may refer to explicit
wenzelm@12364
   370
rules instead of full simplifier context; 'iff' attribute handles
wenzelm@12364
   371
conditional rules;
wenzelm@11936
   372
wenzelm@11745
   373
* HOL: 'typedef' now allows alternative names for Rep/Abs morphisms;
wenzelm@11745
   374
wenzelm@11690
   375
* HOL: 'recdef' now fails on unfinished automated proofs, use
wenzelm@11633
   376
"(permissive)" option to recover old behavior;
wenzelm@11633
   377
wenzelm@11933
   378
* HOL: 'inductive' no longer features separate (collective) attributes
wenzelm@11933
   379
for 'intros' (was found too confusing);
wenzelm@11933
   380
wenzelm@12405
   381
* HOL: properly declared induction rules less_induct and
wenzelm@12405
   382
wf_induct_rule;
wenzelm@12405
   383
kleing@11788
   384
wenzelm@11474
   385
*** HOL ***
wenzelm@11474
   386
wenzelm@11702
   387
* HOL: moved over to sane numeral syntax; the new policy is as
wenzelm@11702
   388
follows:
wenzelm@11702
   389
wenzelm@11702
   390
  - 0 and 1 are polymorphic constants, which are defined on any
wenzelm@11702
   391
  numeric type (nat, int, real etc.);
wenzelm@11702
   392
wenzelm@11702
   393
  - 2, 3, 4, ... and -1, -2, -3, ... are polymorphic numerals, based
wenzelm@11702
   394
  binary representation internally;
wenzelm@11702
   395
wenzelm@11702
   396
  - type nat has special constructor Suc, and generally prefers Suc 0
wenzelm@11702
   397
  over 1::nat and Suc (Suc 0) over 2::nat;
wenzelm@11702
   398
wenzelm@12364
   399
This change may cause significant problems of INCOMPATIBILITY; here
wenzelm@12364
   400
are some hints on converting existing sources:
wenzelm@11702
   401
wenzelm@11702
   402
  - due to the new "num" token, "-0" and "-1" etc. are now atomic
wenzelm@11702
   403
  entities, so expressions involving "-" (unary or binary minus) need
wenzelm@11702
   404
  to be spaced properly;
wenzelm@11702
   405
wenzelm@11702
   406
  - existing occurrences of "1" may need to be constraint "1::nat" or
wenzelm@11702
   407
  even replaced by Suc 0; similar for old "2";
wenzelm@11702
   408
wenzelm@11702
   409
  - replace "#nnn" by "nnn", and "#-nnn" by "-nnn";
wenzelm@11702
   410
wenzelm@11702
   411
  - remove all special provisions on numerals in proofs;
wenzelm@11702
   412
wenzelm@13042
   413
* HOL: simp rules nat_number expand numerals on nat to Suc/0
wenzelm@12837
   414
representation (depends on bin_arith_simps in the default context);
wenzelm@12837
   415
wenzelm@12736
   416
* HOL: symbolic syntax for x^2 (numeral 2);
wenzelm@12736
   417
wenzelm@12335
   418
* HOL: the class of all HOL types is now called "type" rather than
wenzelm@12335
   419
"term"; INCOMPATIBILITY, need to adapt references to this type class
wenzelm@12335
   420
in axclass/classes, instance/arities, and (usually rare) occurrences
wenzelm@12335
   421
in typings (of consts etc.); internally the class is called
wenzelm@12335
   422
"HOL.type", ML programs should refer to HOLogic.typeS;
wenzelm@12335
   423
wenzelm@12280
   424
* HOL/record package improvements:
wenzelm@12280
   425
  - new derived operations "fields" to build a partial record section,
wenzelm@12280
   426
    "extend" to promote a fixed record to a record scheme, and
wenzelm@12280
   427
    "truncate" for the reverse; cf. theorems "xxx.defs", which are *not*
wenzelm@12280
   428
    declared as simp by default;
wenzelm@12587
   429
  - shared operations ("more", "fields", etc.) now need to be always
wenzelm@12587
   430
    qualified) --- potential INCOMPATIBILITY;
wenzelm@12280
   431
  - removed "make_scheme" operations (use "make" with "extend") --
wenzelm@12280
   432
    INCOMPATIBILITY;
wenzelm@11937
   433
  - removed "more" class (simply use "term") -- INCOMPATIBILITY;
wenzelm@12253
   434
  - provides cases/induct rules for use with corresponding Isar
wenzelm@12253
   435
    methods (for concrete records, record schemes, concrete more
wenzelm@12280
   436
    parts, and schematic more parts -- in that order);
wenzelm@11930
   437
  - internal definitions directly based on a light-weight abstract
wenzelm@11930
   438
    theory of product types over typedef rather than datatype;
wenzelm@11930
   439
berghofe@13023
   440
* HOL: generic code generator for generating executable ML code from
berghofe@13023
   441
specifications; specific support for HOL constructs such as inductive
berghofe@13023
   442
datatypes and sets, as well as recursive functions; can be invoked
berghofe@13023
   443
via 'generate_code' theory section;
berghofe@13023
   444
wenzelm@11933
   445
* HOL: canonical cases/induct rules for n-tuples (n = 3..7);
wenzelm@11933
   446
paulson@13824
   447
* HOL: consolidated and renamed several theories.  In particular:
paulson@13824
   448
	Ord.thy has been absorbed into HOL.thy
paulson@13824
   449
	String.thy has been absorbed into List.thy
paulson@13824
   450
 
wenzelm@11802
   451
* HOL: concrete setsum syntax "\<Sum>i:A. b" == "setsum (%i. b) A"
wenzelm@11802
   452
(beware of argument permutation!);
wenzelm@11802
   453
wenzelm@11657
   454
* HOL: linorder_less_split superseded by linorder_cases;
wenzelm@11657
   455
wenzelm@12917
   456
* HOL/List: "nodups" renamed to "distinct";
nipkow@12889
   457
wenzelm@11633
   458
* HOL: added "The" definite description operator; move Hilbert's "Eps"
paulson@13824
   459
to peripheral theory "Hilbert_Choice"; some INCOMPATIBILITIES:
paulson@13824
   460
  - Ex_def has changed, now need to use some_eq_ex
wenzelm@11437
   461
wenzelm@11572
   462
* HOL: made split_all_tac safe; EXISTING PROOFS MAY FAIL OR LOOP, so
wenzelm@11572
   463
in this (rare) case use:
wenzelm@11572
   464
wenzelm@11572
   465
  delSWrapper "split_all_tac"
wenzelm@11572
   466
  addSbefore ("unsafe_split_all_tac", unsafe_split_all_tac)
wenzelm@11572
   467
wenzelm@11572
   468
* HOL: added safe wrapper "split_conv_tac" to claset; EXISTING PROOFS
wenzelm@11474
   469
MAY FAIL;
nipkow@11361
   470
wenzelm@11572
   471
* HOL: introduced f^n = f o ... o f; warning: due to the limits of
wenzelm@11572
   472
Isabelle's type classes, ^ on functions and relations has too general
wenzelm@11572
   473
a domain, namely ('a * 'b) set and 'a => 'b; this means that it may be
wenzelm@11572
   474
necessary to attach explicit type constraints;
nipkow@11307
   475
wenzelm@12917
   476
* HOL/Relation: the prefix name of the infix "O" has been changed from
wenzelm@12917
   477
"comp" to "rel_comp"; INCOMPATIBILITY: a few theorems have been
wenzelm@12917
   478
renamed accordingly (eg "compI" -> "rel_compI").
nipkow@12489
   479
wenzelm@11487
   480
* HOL: syntax translations now work properly with numerals and records
wenzelm@11487
   481
expressions;
wenzelm@11474
   482
wenzelm@12457
   483
* HOL: bounded abstraction now uses syntax "%" / "\<lambda>" instead
wenzelm@12457
   484
of "lam" -- INCOMPATIBILITY;
wenzelm@11474
   485
wenzelm@11933
   486
* HOL: got rid of some global declarations (potential INCOMPATIBILITY
wenzelm@11933
   487
for ML tools): const "()" renamed "Product_Type.Unity", type "unit"
wenzelm@11933
   488
renamed "Product_Type.unit";
wenzelm@11611
   489
nipkow@12564
   490
* HOL: renamed rtrancl_into_rtrancl2 to converse_rtrancl_into_rtrancl
nipkow@12564
   491
wenzelm@12924
   492
* HOL: removed obsolete theorem "optionE" (use "option.exhaust", or
wenzelm@12924
   493
the "cases" method);
wenzelm@12924
   494
wenzelm@12597
   495
* HOL/GroupTheory: group theory examples including Sylow's theorem (by
wenzelm@12597
   496
Florian Kammüller);
wenzelm@12597
   497
wenzelm@12608
   498
* HOL/IMP: updated and converted to new-style theory format; several
wenzelm@12608
   499
parts turned into readable document, with proper Isar proof texts and
wenzelm@12608
   500
some explanations (by Gerwin Klein);
wenzelm@12597
   501
wenzelm@12734
   502
* HOL-Real: added Complex_Numbers (by Gertrud Bauer);
wenzelm@12734
   503
wenzelm@12690
   504
* HOL-Hyperreal is now a logic image;
wenzelm@12690
   505
wenzelm@11611
   506
wenzelm@12022
   507
*** HOLCF ***
wenzelm@12022
   508
wenzelm@12622
   509
* Isar: consts/constdefs supports mixfix syntax for continuous
wenzelm@12622
   510
operations;
wenzelm@12622
   511
wenzelm@12622
   512
* Isar: domain package adapted to new-style theory format, e.g. see
wenzelm@12622
   513
HOLCF/ex/Dnat.thy;
wenzelm@12622
   514
wenzelm@12622
   515
* theory Lift: proper use of rep_datatype lift instead of ML hacks --
wenzelm@12280
   516
potential INCOMPATIBILITY; now use plain induct_tac instead of former
wenzelm@12280
   517
lift.induct_tac, always use UU instead of Undef;
wenzelm@12022
   518
wenzelm@12597
   519
* HOLCF/IMP: updated and converted to new-style theory;
wenzelm@12597
   520
wenzelm@12022
   521
wenzelm@11474
   522
*** ZF ***
wenzelm@11474
   523
wenzelm@12622
   524
* Isar: proper integration of logic-specific tools and packages,
wenzelm@12622
   525
including theory commands '(co)inductive', '(co)datatype',
wenzelm@12622
   526
'rep_datatype', 'inductive_cases', as well as methods 'ind_cases',
wenzelm@12622
   527
'induct_tac', 'case_tac', and 'typecheck' (with attribute 'TC');
wenzelm@12622
   528
wenzelm@12622
   529
* theory Main no longer includes AC; for the Axiom of Choice, base
wenzelm@12622
   530
your theory on Main_ZFC;
wenzelm@12622
   531
wenzelm@12622
   532
* the integer library now covers quotients and remainders, with many
wenzelm@12622
   533
laws relating division to addition, multiplication, etc.;
paulson@12563
   534
wenzelm@12280
   535
* ZF/UNITY: Chandy and Misra's UNITY is now available in ZF, giving a
wenzelm@12280
   536
typeless version of the formalism;
wenzelm@12280
   537
wenzelm@13025
   538
* ZF/AC, Coind, IMP, Resid: updated and converted to new-style theory
wenzelm@13025
   539
format;
wenzelm@12608
   540
wenzelm@12280
   541
* ZF/Induct: new directory for examples of inductive definitions,
wenzelm@12608
   542
including theory Multiset for multiset orderings; converted to
wenzelm@12608
   543
new-style theory format;
wenzelm@12177
   544
wenzelm@13025
   545
* ZF: many new theorems about lists, ordinals, etc.;
paulson@12850
   546
wenzelm@11474
   547
wenzelm@11474
   548
*** General ***
wenzelm@11474
   549
wenzelm@12280
   550
* Pure/kernel: meta-level proof terms (by Stefan Berghofer); reference
wenzelm@12280
   551
variable proof controls level of detail: 0 = no proofs (only oracle
wenzelm@12280
   552
dependencies), 1 = lemma dependencies, 2 = compact proof terms; see
wenzelm@12280
   553
also ref manual for further ML interfaces;
wenzelm@12280
   554
wenzelm@12280
   555
* Pure/axclass: removed obsolete ML interface
wenzelm@12280
   556
goal_subclass/goal_arity;
wenzelm@12280
   557
wenzelm@12280
   558
* Pure/syntax: new token syntax "num" for plain numerals (without "#"
wenzelm@12280
   559
of "xnum"); potential INCOMPATIBILITY, since -0, -1 etc. are now
wenzelm@12280
   560
separate tokens, so expressions involving minus need to be spaced
wenzelm@12280
   561
properly;
wenzelm@12280
   562
wenzelm@12312
   563
* Pure/syntax: support non-oriented infixes, using keyword "infix"
wenzelm@12312
   564
rather than "infixl" or "infixr";
wenzelm@12312
   565
wenzelm@12312
   566
* Pure/syntax: concrete syntax for dummy type variables admits genuine
wenzelm@12312
   567
sort constraint specifications in type inference; e.g. "x::_::foo"
wenzelm@12312
   568
ensures that the type of "x" is of sort "foo" (but not necessarily a
wenzelm@12312
   569
type variable);
wenzelm@12280
   570
wenzelm@12280
   571
* Pure/syntax: print modes "type_brackets" and "no_type_brackets"
wenzelm@12280
   572
control output of nested => (types); the default behavior is
wenzelm@12280
   573
"type_brackets";
wenzelm@12280
   574
wenzelm@12280
   575
* Pure/syntax: builtin parse translation for "_constify" turns valued
wenzelm@11817
   576
tokens into AST constants;
wenzelm@11474
   577
wenzelm@12280
   578
* Pure/syntax: prefer later declarations of translations and print
wenzelm@12280
   579
translation functions; potential INCOMPATIBILITY: need to reverse
wenzelm@12280
   580
multiple declarations for same syntax element constant;
wenzelm@12280
   581
wenzelm@12832
   582
* Pure/show_hyps reset by default (in accordance to existing Isar
wenzelm@12832
   583
practice);
wenzelm@12832
   584
wenzelm@12280
   585
* Provers/classical: renamed addaltern to addafter, addSaltern to
wenzelm@12280
   586
addSafter;
wenzelm@12280
   587
wenzelm@12280
   588
* Provers/clasimp: ``iff'' declarations now handle conditional rules
wenzelm@12280
   589
as well;
wenzelm@12253
   590
wenzelm@12538
   591
* system: tested support for MacOS X; should be able to get Isabelle +
wenzelm@12538
   592
Proof General to work in a plain Terminal after installing Poly/ML
wenzelm@12538
   593
(e.g. from the Isabelle distribution area) and GNU bash alone
wenzelm@12538
   594
(e.g. from http://www.apple.com); full X11, XEmacs and X-Symbol
wenzelm@12538
   595
support requires further installations, e.g. from
wenzelm@12538
   596
http://fink.sourceforge.net/);
wenzelm@12538
   597
wenzelm@12280
   598
* system: support Poly/ML 4.1.1 (able to manage larger heaps);
wenzelm@11551
   599
wenzelm@12753
   600
* system: reduced base memory usage by Poly/ML (approx. 20 MB instead
wenzelm@12753
   601
of 40 MB), cf. ML_OPTIONS;
wenzelm@12753
   602
wenzelm@11633
   603
* system: Proof General keywords specification is now part of the
wenzelm@11633
   604
Isabelle distribution (see etc/isar-keywords.el);
wenzelm@11633
   605
wenzelm@12728
   606
* system: support for persistent Proof General sessions (refrain from
wenzelm@12728
   607
outdating all loaded theories on startup); user may create writable
wenzelm@12728
   608
logic images like this: ``isabelle -q HOL Test'';
wenzelm@12597
   609
wenzelm@11551
   610
* system: smart selection of Isabelle process versus Isabelle
wenzelm@11572
   611
interface, accommodates case-insensitive file systems (e.g. HFS+); may
wenzelm@11572
   612
run both "isabelle" and "Isabelle" even if file names are badly
wenzelm@11572
   613
damaged (executable inspects the case of the first letter of its own
wenzelm@11572
   614
name); added separate "isabelle-process" and "isabelle-interface";
wenzelm@11551
   615
wenzelm@12472
   616
* system: refrain from any attempt at filtering input streams; no
wenzelm@12472
   617
longer support ``8bit'' encoding of old isabelle font, instead proper
wenzelm@12472
   618
iso-latin characters may now be used; the related isatools
wenzelm@12472
   619
"symbolinput" and "nonascii" have disappeared as well;
wenzelm@12472
   620
wenzelm@12472
   621
* system: removed old "xterm" interface (the print modes "xterm" and
wenzelm@12472
   622
"xterm_color" are still available for direct use in a suitable
wenzelm@12472
   623
terminal);
wenzelm@12472
   624
paulson@11314
   625
oheimb@11169
   626
wenzelm@11062
   627
New in Isabelle99-2 (February 2001)
wenzelm@11062
   628
-----------------------------------
wenzelm@11062
   629
nipkow@10224
   630
*** Overview of INCOMPATIBILITIES ***
nipkow@10224
   631
paulson@11241
   632
* HOL: please note that theories in the Library and elsewhere often use the
paulson@11241
   633
new-style (Isar) format; to refer to their theorems in an ML script you must
wenzelm@12622
   634
bind them to ML identifers by e.g.      val thm_name = thm "thm_name";
paulson@11241
   635
wenzelm@11043
   636
* HOL: inductive package no longer splits induction rule aggressively,
wenzelm@11043
   637
but only as far as specified by the introductions given; the old
oheimb@11130
   638
format may be recovered via ML function complete_split_rule or attribute
wenzelm@11043
   639
'split_rule (complete)';
wenzelm@11043
   640
wenzelm@10998
   641
* HOL: induct renamed to lfp_induct, lfp_Tarski to lfp_unfold,
wenzelm@10998
   642
gfp_Tarski to gfp_unfold;
nipkow@10224
   643
paulson@10288
   644
* HOL: contrapos, contrapos2 renamed to contrapos_nn, contrapos_pp;
paulson@10288
   645
wenzelm@10858
   646
* HOL: infix "dvd" now has priority 50 rather than 70 (because it is a
wenzelm@10858
   647
relation); infix "^^" has been renamed "``"; infix "``" has been
wenzelm@10858
   648
renamed "`"; "univalent" has been renamed "single_valued";
nipkow@10793
   649
wenzelm@10998
   650
* HOL/Real: "rinv" and "hrinv" replaced by overloaded "inverse"
wenzelm@10998
   651
operation;
wenzelm@10998
   652
nipkow@10868
   653
* HOLCF: infix "`" has been renamed "$"; the symbol syntax is \<cdot>;
nipkow@10856
   654
wenzelm@10391
   655
* Isar: 'obtain' no longer declares "that" fact as simp/intro;
wenzelm@10391
   656
wenzelm@10401
   657
* Isar/HOL: method 'induct' now handles non-atomic goals; as a
wenzelm@10401
   658
consequence, it is no longer monotonic wrt. the local goal context
wenzelm@10401
   659
(which is now passed through the inductive cases);
wenzelm@10401
   660
wenzelm@10976
   661
* Document preparation: renamed standard symbols \<ll> to \<lless> and
wenzelm@10976
   662
\<gg> to \<ggreater>;
wenzelm@10976
   663
nipkow@10224
   664
wenzelm@10245
   665
*** Document preparation ***
wenzelm@10245
   666
wenzelm@10858
   667
* \isabellestyle{NAME} selects version of Isabelle output (currently
wenzelm@10858
   668
available: are "it" for near math-mode best-style output, "sl" for
wenzelm@10858
   669
slanted text style, and "tt" for plain type-writer; if no
wenzelm@10858
   670
\isabellestyle command is given, output is according to slanted
wenzelm@10858
   671
type-writer);
wenzelm@10858
   672
wenzelm@10322
   673
* support sub/super scripts (for single symbols only), input syntax is
wenzelm@10322
   674
like this: "A\<^sup>*" or "A\<^sup>\<star>";
wenzelm@10322
   675
wenzelm@10858
   676
* some more standard symbols; see Appendix A of the system manual for
wenzelm@11062
   677
the complete list of symbols defined in isabellesym.sty;
wenzelm@10858
   678
wenzelm@10998
   679
* improved isabelle style files; more abstract symbol implementation
wenzelm@10998
   680
(should now use \isamath{...} and \isatext{...} in custom symbol
wenzelm@10998
   681
definitions);
wenzelm@10998
   682
wenzelm@10634
   683
* antiquotation @{goals} and @{subgoals} for output of *dynamic* goals
wenzelm@10634
   684
state; Note that presentation of goal states does not conform to
wenzelm@10634
   685
actual human-readable proof documents.  Please do not include goal
wenzelm@10634
   686
states into document output unless you really know what you are doing!
wenzelm@10322
   687
wenzelm@11062
   688
* proper indentation of antiquoted output with proportional LaTeX
wenzelm@11062
   689
fonts;
wenzelm@10862
   690
wenzelm@11050
   691
* no_document ML operator temporarily disables LaTeX document
wenzelm@11050
   692
generation;
wenzelm@11050
   693
wenzelm@11062
   694
* isatool unsymbolize tunes sources for plain ASCII communication;
wenzelm@11062
   695
wenzelm@10322
   696
wenzelm@10306
   697
*** Isar ***
wenzelm@10306
   698
wenzelm@10547
   699
* Pure: Isar now suffers initial goal statements to contain unbound
wenzelm@10547
   700
schematic variables (this does not conform to actual readable proof
wenzelm@10547
   701
documents, due to unpredictable outcome and non-compositional proof
wenzelm@10547
   702
checking); users who know what they are doing may use schematic goals
wenzelm@10547
   703
for Prolog-style synthesis of proven results;
wenzelm@10547
   704
wenzelm@10391
   705
* Pure: assumption method (an implicit finishing) now handles actual
wenzelm@10391
   706
rules as well;
wenzelm@10391
   707
wenzelm@10391
   708
* Pure: improved 'obtain' --- moved to Pure, insert "that" into
wenzelm@10391
   709
initial goal, declare "that" only as Pure intro (only for single
wenzelm@10391
   710
steps); the "that" rule assumption may now be involved in implicit
wenzelm@10391
   711
finishing, thus ".." becomes a feasible for trivial obtains;
wenzelm@10391
   712
wenzelm@10391
   713
* Pure: default proof step now includes 'intro_classes'; thus trivial
wenzelm@10391
   714
instance proofs may be performed by "..";
wenzelm@10391
   715
wenzelm@10391
   716
* Pure: ?thesis / ?this / "..." now work for pure meta-level
wenzelm@10391
   717
statements as well;
wenzelm@10306
   718
wenzelm@11097
   719
* Pure: more robust selection of calculational rules;
wenzelm@11097
   720
wenzelm@10858
   721
* Pure: the builtin notion of 'finished' goal now includes the ==-refl
wenzelm@10858
   722
rule (as well as the assumption rule);
wenzelm@10858
   723
wenzelm@10858
   724
* Pure: 'thm_deps' command visualizes dependencies of theorems and
wenzelm@10858
   725
lemmas, using the graph browser tool;
wenzelm@10858
   726
wenzelm@10944
   727
* Pure: predict failure of "show" in interactive mode;
wenzelm@10944
   728
wenzelm@11016
   729
* Pure: 'thms_containing' now takes actual terms as arguments;
wenzelm@11016
   730
wenzelm@10401
   731
* HOL: improved method 'induct' --- now handles non-atomic goals
wenzelm@10401
   732
(potential INCOMPATIBILITY); tuned error handling;
wenzelm@10401
   733
wenzelm@10557
   734
* HOL: cases and induct rules now provide explicit hints about the
wenzelm@10547
   735
number of facts to be consumed (0 for "type" and 1 for "set" rules);
wenzelm@10547
   736
any remaining facts are inserted into the goal verbatim;
wenzelm@10547
   737
wenzelm@10858
   738
* HOL: local contexts (aka cases) may now contain term bindings as
wenzelm@10858
   739
well; the 'cases' and 'induct' methods new provide a ?case binding for
wenzelm@10858
   740
the result to be shown in each case;
wenzelm@10858
   741
wenzelm@10770
   742
* HOL: added 'recdef_tc' command;
wenzelm@10770
   743
wenzelm@11016
   744
* isatool convert assists in eliminating legacy ML scripts;
wenzelm@11016
   745
wenzelm@10306
   746
wenzelm@10245
   747
*** HOL ***
wenzelm@10245
   748
wenzelm@10245
   749
* HOL/Library: a collection of generic theories to be used together
wenzelm@10245
   750
with main HOL; the theory loader path already includes this directory
wenzelm@10245
   751
by default; the following existing theories have been moved here:
wenzelm@10245
   752
HOL/Induct/Multiset, HOL/Induct/Acc (as Accessible_Part), HOL/While
wenzelm@10337
   753
(as While_Combinator), HOL/Lex/Prefix (as List_Prefix);
wenzelm@10245
   754
wenzelm@10966
   755
* HOL/Unix: "Some aspects of Unix file-system security", a typical
wenzelm@10966
   756
modelling and verification task performed in Isabelle/HOL +
wenzelm@10966
   757
Isabelle/Isar + Isabelle document preparation (by Markus Wenzel).
wenzelm@10966
   758
wenzelm@11094
   759
* HOL/Algebra: special summation operator SUM no longer exists, it has
wenzelm@11094
   760
been replaced by setsum; infix 'assoc' now has priority 50 (like
wenzelm@11094
   761
'dvd'); axiom 'one_not_zero' has been moved from axclass 'ring' to
wenzelm@11094
   762
'domain', this makes the theory consistent with mathematical
wenzelm@11094
   763
literature;
wenzelm@11094
   764
wenzelm@10514
   765
* HOL basics: added overloaded operations "inverse" and "divide"
wenzelm@10726
   766
(infix "/"), syntax for generic "abs" operation, generic summation
wenzelm@11094
   767
operator \<Sum>;
wenzelm@10452
   768
wenzelm@10391
   769
* HOL/typedef: simplified package, provide more useful rules (see also
wenzelm@10391
   770
HOL/subset.thy);
wenzelm@10391
   771
wenzelm@10915
   772
* HOL/datatype: induction rule for arbitrarily branching datatypes is
wenzelm@10915
   773
now expressed as a proper nested rule (old-style tactic scripts may
wenzelm@10915
   774
require atomize_strip_tac to cope with non-atomic premises);
wenzelm@10915
   775
wenzelm@10915
   776
* HOL: renamed theory "Prod" to "Product_Type", renamed "split" rule
wenzelm@10915
   777
to "split_conv" (old name still available for compatibility);
wenzelm@10915
   778
wenzelm@10915
   779
* HOL: improved concrete syntax for strings (e.g. allows translation
wenzelm@10915
   780
rules with string literals);
wenzelm@10915
   781
paulson@12245
   782
* HOL-Real-Hyperreal: this extends HOL-Real with the hyperreals
paulson@12245
   783
 and Fleuriot's mechanization of analysis, including the transcendental
paulson@12245
   784
 functions for the reals;
paulson@10756
   785
wenzelm@11094
   786
* HOL/Real, HOL/Hyperreal: improved arithmetic simplification;
wenzelm@10391
   787
wenzelm@10858
   788
paulson@10474
   789
*** CTT ***
paulson@10474
   790
wenzelm@10547
   791
* CTT: x-symbol support for Pi, Sigma, -->, : (membership); note that
wenzelm@10547
   792
"lam" is displayed as TWO lambda-symbols
paulson@10474
   793
wenzelm@10547
   794
* CTT: theory Main now available, containing everything (that is, Bool
wenzelm@10547
   795
and Arith);
wenzelm@10547
   796
paulson@10474
   797
wenzelm@10391
   798
*** General ***
wenzelm@10391
   799
wenzelm@10547
   800
* Pure: the Simplifier has been implemented properly as a derived rule
wenzelm@10547
   801
outside of the actual kernel (at last!); the overall performance
wenzelm@10547
   802
penalty in practical applications is about 50%, while reliability of
wenzelm@10547
   803
the Isabelle inference kernel has been greatly improved;
wenzelm@10547
   804
wenzelm@11112
   805
* print modes "brackets" and "no_brackets" control output of nested =>
wenzelm@11112
   806
(types) and ==> (props); the default behaviour is "brackets";
wenzelm@11112
   807
wenzelm@10391
   808
* Provers: fast_tac (and friends) now handle actual object-logic rules
wenzelm@10391
   809
as assumptions as well;
wenzelm@10391
   810
wenzelm@11124
   811
* system: support Poly/ML 4.0;
wenzelm@11124
   812
wenzelm@11124
   813
* system: isatool install handles KDE version 1 or 2;
wenzelm@11124
   814
wenzelm@10391
   815
wenzelm@10245
   816
wenzelm@10103
   817
New in Isabelle99-1 (October 2000)
wenzelm@10103
   818
----------------------------------
wenzelm@8015
   819
wenzelm@10003
   820
*** Overview of INCOMPATIBILITIES ***
paulson@8014
   821
wenzelm@8848
   822
* HOL: simplification of natural numbers is much changed; to partly
wenzelm@8848
   823
recover the old behaviour (e.g. to prevent n+n rewriting to #2*n)
wenzelm@8848
   824
issue the following ML commands:
wenzelm@8848
   825
wenzelm@8848
   826
  Delsimprocs Nat_Numeral_Simprocs.cancel_numerals;
wenzelm@8848
   827
  Delsimprocs [Nat_Numeral_Simprocs.combine_numerals];
paulson@8788
   828
wenzelm@10129
   829
* HOL: simplification no longer dives into case-expressions; this is
wenzelm@10129
   830
controlled by "t.weak_case_cong" for each datatype t;
wenzelm@10003
   831
wenzelm@10003
   832
* HOL: nat_less_induct renamed to less_induct;
wenzelm@10003
   833
wenzelm@10003
   834
* HOL: systematic renaming of the SOME (Eps) rules, may use isatool
wenzelm@10003
   835
fixsome to patch .thy and .ML sources automatically;
paulson@8967
   836
wenzelm@10003
   837
  select_equality  -> some_equality
wenzelm@10003
   838
  select_eq_Ex     -> some_eq_ex
wenzelm@10003
   839
  selectI2EX       -> someI2_ex
wenzelm@10003
   840
  selectI2         -> someI2
wenzelm@10003
   841
  selectI          -> someI
wenzelm@10003
   842
  select1_equality -> some1_equality
wenzelm@10003
   843
  Eps_sym_eq       -> some_sym_eq_trivial
wenzelm@10003
   844
  Eps_eq           -> some_eq_trivial
wenzelm@10003
   845
wenzelm@10003
   846
* HOL: exhaust_tac on datatypes superceded by new generic case_tac;
wenzelm@10003
   847
wenzelm@10003
   848
* HOL: removed obsolete theorem binding expand_if (refer to split_if
wenzelm@10003
   849
instead);
wenzelm@10003
   850
wenzelm@10003
   851
* HOL: the recursion equations generated by 'recdef' are now called
wenzelm@10003
   852
f.simps instead of f.rules;
wenzelm@10003
   853
wenzelm@10003
   854
* HOL: qed_spec_mp now also handles bounded ALL as well;
wenzelm@10003
   855
wenzelm@10003
   856
* HOL: 0 is now overloaded, so the type constraint ":: nat" may
wenzelm@10003
   857
sometimes be needed;
wenzelm@10003
   858
wenzelm@10003
   859
* HOL: the constant for "f``x" is now "image" rather than "op ``";
paulson@8014
   860
paulson@10065
   861
* HOL: the constant for "f-``x" is now "vimage" rather than "op -``";
paulson@10065
   862
wenzelm@9330
   863
* HOL: the disjoint sum is now "<+>" instead of "Plus"; the cartesian
wenzelm@9330
   864
product is now "<*>" instead of "Times"; the lexicographic product is
wenzelm@9330
   865
now "<*lex*>" instead of "**";
nipkow@8705
   866
wenzelm@10003
   867
* HOL: theory Sexp is now in HOL/Induct examples (it used to be part
wenzelm@10003
   868
of main HOL, but was unused); better use HOL's datatype package;
paulson@9971
   869
wenzelm@10137
   870
* HOL: removed "symbols" syntax for constant "override" of theory Map;
wenzelm@10137
   871
the old syntax may be recovered as follows:
wenzelm@10137
   872
wenzelm@10137
   873
  syntax (symbols)
wenzelm@10137
   874
    override  :: "('a ~=> 'b) => ('a ~=> 'b) => ('a ~=> 'b)"
wenzelm@10137
   875
      (infixl "\\<oplus>" 100)
wenzelm@10137
   876
wenzelm@8848
   877
* HOL/Real: "rabs" replaced by overloaded "abs" function;
wenzelm@8848
   878
wenzelm@8887
   879
* HOL/ML: even fewer consts are declared as global (see theories Ord,
wenzelm@8887
   880
Lfp, Gfp, WF); this only affects ML packages that refer to const names
wenzelm@8887
   881
internally;
wenzelm@8887
   882
wenzelm@10003
   883
* HOL and ZF: syntax for quotienting wrt an equivalence relation
wenzelm@10003
   884
changed from A/r to A//r;
wenzelm@9908
   885
wenzelm@10003
   886
* ZF: new treatment of arithmetic (nat & int) may break some old
wenzelm@10003
   887
proofs;
wenzelm@8921
   888
wenzelm@10003
   889
* Isar: renamed some attributes (RS -> THEN, simplify -> simplified,
wenzelm@10003
   890
rulify -> rule_format, elimify -> elim_format, ...);
paulson@9542
   891
wenzelm@9941
   892
* Isar/Provers: intro/elim/dest attributes changed; renamed
wenzelm@9941
   893
intro/intro!/intro!! flags to intro!/intro/intro? (in most cases, one
wenzelm@9937
   894
should have to change intro!! to intro? only); replaced "delrule" by
wenzelm@9937
   895
"rule del";
wenzelm@9437
   896
wenzelm@9612
   897
* Isar/HOL: renamed "intrs" to "intros" in inductive definitions;
wenzelm@9612
   898
wenzelm@9437
   899
* Provers: strengthened force_tac by using new first_best_tac;
oheimb@9402
   900
wenzelm@10003
   901
* LaTeX document preparation: several changes of isabelle.sty (see
wenzelm@10003
   902
lib/texinputs);
wenzelm@8729
   903
paulson@8014
   904
wenzelm@8487
   905
*** Document preparation ***
wenzelm@8358
   906
wenzelm@9198
   907
* formal comments (text blocks etc.) in new-style theories may now
wenzelm@9753
   908
contain antiquotations of thm/prop/term/typ/text to be presented
wenzelm@9753
   909
according to latex print mode; concrete syntax is like this:
wenzelm@9753
   910
@{term[show_types] "f(x) = a + x"};
wenzelm@9198
   911
wenzelm@8358
   912
* isatool mkdir provides easy setup of Isabelle session directories,
wenzelm@8518
   913
including proper document sources;
wenzelm@8358
   914
wenzelm@8358
   915
* generated LaTeX sources are now deleted after successful run
wenzelm@8358
   916
(isatool document -c); may retain a copy somewhere else via -D option
wenzelm@8358
   917
of isatool usedir;
wenzelm@8358
   918
wenzelm@8566
   919
* isatool usedir -D now lets isatool latex -o sty update the Isabelle
wenzelm@10003
   920
style files, achieving self-contained LaTeX sources and simplifying
wenzelm@10003
   921
LaTeX debugging;
wenzelm@8566
   922
wenzelm@8518
   923
* old-style theories now produce (crude) LaTeX output as well;
wenzelm@8358
   924
wenzelm@9057
   925
* browser info session directories are now self-contained (may be put
wenzelm@9437
   926
on WWW server seperately); improved graphs of nested sessions; removed
wenzelm@9437
   927
graph for 'all sessions';
wenzelm@9057
   928
wenzelm@10003
   929
* several improvements in isabelle style files; \isabellestyle{it}
wenzelm@10003
   930
produces fake math mode output; \isamarkupheader is now \section by
wenzelm@10003
   931
default; see lib/texinputs/isabelle.sty etc.;
wenzelm@9489
   932
wenzelm@8358
   933
wenzelm@8184
   934
*** Isar ***
wenzelm@8184
   935
wenzelm@10003
   936
* Isar/Pure: local results and corresponding term bindings are now
wenzelm@10003
   937
subject to Hindley-Milner polymorphism (similar to ML); this
wenzelm@10003
   938
accommodates incremental type-inference very nicely;
wenzelm@8283
   939
wenzelm@10003
   940
* Isar/Pure: new derived language element 'obtain' supports
wenzelm@10003
   941
generalized existence reasoning;
wenzelm@8621
   942
wenzelm@10003
   943
* Isar/Pure: new calculational elements 'moreover' and 'ultimately'
wenzelm@10003
   944
support accumulation of results, without applying any rules yet;
wenzelm@10003
   945
useful to collect intermediate results without explicit name
wenzelm@10003
   946
references, and for use with transitivity rules with more than 2
wenzelm@10003
   947
premises;
wenzelm@8184
   948
wenzelm@10003
   949
* Isar/Pure: scalable support for case-analysis type proofs: new
wenzelm@10003
   950
'case' language element refers to local contexts symbolically, as
wenzelm@10003
   951
produced by certain proof methods; internally, case names are attached
wenzelm@10003
   952
to theorems as "tags";
wenzelm@8440
   953
wenzelm@10003
   954
* Isar/Pure: theory command 'hide' removes declarations from
wenzelm@9330
   955
class/type/const name spaces;
wenzelm@9330
   956
wenzelm@10003
   957
* Isar/Pure: theory command 'defs' supports option "(overloaded)" to
wenzelm@9330
   958
indicate potential overloading;
wenzelm@9330
   959
wenzelm@10003
   960
* Isar/Pure: changed syntax of local blocks from {{ }} to { };
wenzelm@8621
   961
wenzelm@10003
   962
* Isar/Pure: syntax of sorts made 'inner', i.e. have to write
wenzelm@10003
   963
"{a,b,c}" instead of {a,b,c};
wenzelm@9011
   964
wenzelm@10003
   965
* Isar/Pure now provides its own version of intro/elim/dest
wenzelm@10003
   966
attributes; useful for building new logics, but beware of confusion
wenzelm@10003
   967
with the version in Provers/classical;
wenzelm@9612
   968
wenzelm@10003
   969
* Isar/Pure: the local context of (non-atomic) goals is provided via
wenzelm@10003
   970
case name 'antecedent';
wenzelm@8440
   971
wenzelm@10003
   972
* Isar/Pure: removed obsolete 'transfer' attribute (transfer of thms
wenzelm@10003
   973
to the current context is now done automatically);
wenzelm@9383
   974
wenzelm@10003
   975
* Isar/Pure: theory command 'method_setup' provides a simple interface
wenzelm@10003
   976
for definining proof methods in ML;
wenzelm@9612
   977
wenzelm@10003
   978
* Isar/Provers: intro/elim/dest attributes changed; renamed
wenzelm@9941
   979
intro/intro!/intro!! flags to intro!/intro/intro? (INCOMPATIBILITY, in
wenzelm@9941
   980
most cases, one should have to change intro!! to intro? only);
wenzelm@9941
   981
replaced "delrule" by "rule del";
wenzelm@8283
   982
wenzelm@10003
   983
* Isar/Provers: new 'hypsubst' method, plain 'subst' method and
wenzelm@10003
   984
'symmetric' attribute (the latter supercedes [RS sym]);
wenzelm@10003
   985
wenzelm@10003
   986
* Isar/Provers: splitter support (via 'split' attribute and 'simp'
wenzelm@10003
   987
method modifier); 'simp' method: 'only:' modifier removes loopers as
wenzelm@10003
   988
well (including splits);
wenzelm@10003
   989
wenzelm@10003
   990
* Isar/Provers: Simplifier and Classical methods now support all kind
wenzelm@10003
   991
of modifiers used in the past, including 'cong', 'iff', etc.
wenzelm@10003
   992
wenzelm@10003
   993
* Isar/Provers: added 'fastsimp' and 'clarsimp' methods (combination
wenzelm@10003
   994
of Simplifier and Classical reasoner);
wenzelm@10003
   995
wenzelm@10003
   996
* Isar/HOL: new proof method 'cases' and improved version of 'induct'
wenzelm@10003
   997
now support named cases; major packages (inductive, datatype, primrec,
wenzelm@10003
   998
recdef) support case names and properly name parameters;
wenzelm@9612
   999
wenzelm@10003
  1000
* Isar/HOL: new transitivity rules for substitution in inequalities --
wenzelm@10003
  1001
monotonicity conditions are extracted to be proven at end of
wenzelm@10003
  1002
calculations;
wenzelm@10003
  1003
wenzelm@10003
  1004
* Isar/HOL: removed 'case_split' thm binding, should use 'cases' proof
wenzelm@10003
  1005
method anyway;
wenzelm@10003
  1006
wenzelm@10003
  1007
* Isar/HOL: removed old expand_if = split_if; theorems if_splits =
wenzelm@10003
  1008
split_if split_if_asm; datatype package provides theorems foo.splits =
wenzelm@10003
  1009
foo.split foo.split_asm for each datatype;
wenzelm@10003
  1010
wenzelm@10003
  1011
* Isar/HOL: tuned inductive package, rename "intrs" to "intros"
wenzelm@10003
  1012
(potential INCOMPATIBILITY), emulation of mk_cases feature for proof
wenzelm@10003
  1013
scripts: new 'inductive_cases' command and 'ind_cases' method; (Note:
wenzelm@10003
  1014
use "(cases (simplified))" method in proper proof texts);
wenzelm@10003
  1015
wenzelm@10003
  1016
* Isar/HOL: added global 'arith_split' attribute for 'arith' method;
wenzelm@10003
  1017
wenzelm@10003
  1018
* Isar: names of theorems etc. may be natural numbers as well;
wenzelm@10003
  1019
wenzelm@10003
  1020
* Isar: 'pr' command: optional arguments for goals_limit and
wenzelm@9724
  1021
ProofContext.prems_limit; no longer prints theory contexts, but only
wenzelm@9724
  1022
proof states;
wenzelm@8487
  1023
wenzelm@10003
  1024
* Isar: diagnostic commands 'pr', 'thm', 'prop', 'term', 'typ' admit
wenzelm@8518
  1025
additional print modes to be specified; e.g. "pr(latex)" will print
wenzelm@8518
  1026
proof state according to the Isabelle LaTeX style;
wenzelm@8487
  1027
wenzelm@10003
  1028
* Isar: improved support for emulating tactic scripts, including proof
wenzelm@9612
  1029
methods 'rule_tac' etc., 'cut_tac', 'thin_tac', 'subgoal_tac',
wenzelm@9612
  1030
'rename_tac', 'rotate_tac', 'tactic', and 'case_tac' / 'induct_tac'
wenzelm@9612
  1031
(for HOL datatypes);
wenzelm@8534
  1032
wenzelm@10003
  1033
* Isar: simplified (more robust) goal selection of proof methods: 1st
wenzelm@10003
  1034
goal, all goals, or explicit goal specifier (tactic emulation); thus
wenzelm@10003
  1035
'proof method scripts' have to be in depth-first order;
wenzelm@8673
  1036
wenzelm@10003
  1037
* Isar: tuned 'let' syntax: replaced 'as' keyword by 'and';
wenzelm@8729
  1038
wenzelm@10003
  1039
* Isar: removed 'help' command, which hasn't been too helpful anyway;
wenzelm@10003
  1040
should instead use individual commands for printing items
wenzelm@10003
  1041
(print_commands, print_methods etc.);
wenzelm@9224
  1042
wenzelm@10003
  1043
* Isar: added 'nothing' --- the empty list of theorems;
wenzelm@9239
  1044
wenzelm@8184
  1045
paulson@8014
  1046
*** HOL ***
paulson@8014
  1047
wenzelm@10080
  1048
* HOL/MicroJava: formalization of a fragment of Java, together with a
wenzelm@10080
  1049
corresponding virtual machine and a specification of its bytecode
wenzelm@10080
  1050
verifier and a lightweight bytecode verifier, including proofs of
wenzelm@10080
  1051
type-safety; by Gerwin Klein, Tobias Nipkow, David von Oheimb, and
wenzelm@10080
  1052
Cornelia Pusch (see also the homepage of project Bali at
wenzelm@10080
  1053
http://isabelle.in.tum.de/Bali/);
wenzelm@10080
  1054
wenzelm@8518
  1055
* HOL/Algebra: new theory of rings and univariate polynomials, by
wenzelm@8518
  1056
Clemens Ballarin;
paulson@8014
  1057
wenzelm@10157
  1058
* HOL/NumberTheory: fundamental Theorem of Arithmetic, Chinese
wenzelm@10003
  1059
Remainder Theorem, Fermat/Euler Theorem, Wilson's Theorem, by Thomas M
wenzelm@10003
  1060
Rasmussen;
wenzelm@8570
  1061
wenzelm@10157
  1062
* HOL/Lattice: fundamental concepts of lattice theory and order
wenzelm@10157
  1063
structures, including duals, properties of bounds versus algebraic
wenzelm@10157
  1064
laws, lattice operations versus set-theoretic ones, the Knaster-Tarski
wenzelm@10157
  1065
Theorem for complete lattices etc.; may also serve as a demonstration
wenzelm@10157
  1066
for abstract algebraic reasoning using axiomatic type classes, and
wenzelm@10157
  1067
mathematics-style proof in Isabelle/Isar; by Markus Wenzel;
wenzelm@10157
  1068
wenzelm@10003
  1069
* HOL/Prolog: a (bare-bones) implementation of Lambda-Prolog, by David
wenzelm@10003
  1070
von Oheimb;
paulson@9542
  1071
wenzelm@10164
  1072
* HOL/IMPP: extension of IMP with local variables and mutually
wenzelm@10164
  1073
recursive procedures, by David von Oheimb;
wenzelm@10164
  1074
wenzelm@10003
  1075
* HOL/Lambda: converted into new-style theory and document;
paulson@9542
  1076
wenzelm@10003
  1077
* HOL/ex/Multiquote: example of multiple nested quotations and
wenzelm@10003
  1078
anti-quotations -- basically a generalized version of de-Bruijn
wenzelm@10003
  1079
representation; very useful in avoiding lifting of operations;
wenzelm@8848
  1080
wenzelm@9612
  1081
* HOL/record: added general record equality rule to simpset; fixed
wenzelm@9612
  1082
select-update simplification procedure to handle extended records as
wenzelm@9612
  1083
well; admit "r" as field name;
paulson@9542
  1084
paulson@8967
  1085
* HOL: 0 is now overloaded over the new sort "zero", allowing its use with
paulson@8967
  1086
other numeric types and also as the identity of groups, rings, etc.;
paulson@8967
  1087
paulson@8967
  1088
* HOL: new axclass plus_ac0 for addition with the AC-laws and 0 as identity.
paulson@8967
  1089
Types nat and int belong to this axclass;
paulson@8967
  1090
wenzelm@10003
  1091
* HOL: greatly improved simplification involving numerals of type nat, int, real:
paulson@8788
  1092
   (i + #8 + j) = Suc k simplifies to  #7 + (i + j) = k
paulson@8832
  1093
   i*j + k + j*#3*i     simplifies to  #4*(i*j) + k
paulson@8832
  1094
  two terms #m*u and #n*u are replaced by #(m+n)*u
paulson@8832
  1095
    (where #m, #n and u can implicitly be 1; this is simproc combine_numerals)
paulson@8832
  1096
  and the term/formula #m*u+x ~~ #n*u+y simplifies simplifies to #(m-n)+x ~~ y
paulson@8832
  1097
    or x ~~ #(n-m)+y, where ~~ is one of = < <= or - (simproc cancel_numerals);
paulson@8736
  1098
wenzelm@10003
  1099
* HOL: meson_tac is available (previously in ex/meson.ML); it is a
wenzelm@10003
  1100
powerful prover for predicate logic but knows nothing of clasets; see
wenzelm@10003
  1101
ex/mesontest.ML and ex/mesontest2.ML for example applications;
paulson@9835
  1102
wenzelm@8848
  1103
* HOL: new version of "case_tac" subsumes both boolean case split and
wenzelm@8440
  1104
"exhaust_tac" on datatypes; INCOMPATIBILITY: exhaust_tac no longer
wenzelm@8518
  1105
exists, may define val exhaust_tac = case_tac for ad-hoc portability;
wenzelm@8440
  1106
wenzelm@8848
  1107
* HOL: simplification no longer dives into case-expressions: only the
wenzelm@10129
  1108
selector expression is simplified, but not the remaining arms; to
wenzelm@10129
  1109
enable full simplification of case-expressions for datatype t, you may
wenzelm@10129
  1110
remove t.weak_case_cong from the simpset, either globally (Delcongs
wenzelm@10129
  1111
[thm"t.weak_case_cong"];) or locally (delcongs [...]).
nipkow@8603
  1112
wenzelm@8848
  1113
* HOL/recdef: the recursion equations generated by 'recdef' for
wenzelm@8848
  1114
function 'f' are now called f.simps instead of f.rules; if all
wenzelm@8848
  1115
termination conditions are proved automatically, these simplification
wenzelm@8848
  1116
rules are added to the simpset, as in primrec; rules may be named
wenzelm@8848
  1117
individually as well, resulting in a separate list of theorems for
wenzelm@8848
  1118
each equation;
wenzelm@8848
  1119
wenzelm@9489
  1120
* HOL/While is a new theory that provides a while-combinator. It
wenzelm@9489
  1121
permits the definition of tail-recursive functions without the
wenzelm@9489
  1122
provision of a termination measure. The latter is necessary once the
wenzelm@9489
  1123
invariant proof rule for while is applied.
nipkow@9457
  1124
wenzelm@10003
  1125
* HOL: new (overloaded) notation for the set of elements below/above
wenzelm@10003
  1126
some element: {..u}, {..u(}, {l..}, {)l..}. See theory SetInterval.
nipkow@8925
  1127
wenzelm@8848
  1128
* HOL: theorems impI, allI, ballI bound as "strip";
wenzelm@8848
  1129
wenzelm@10003
  1130
* HOL: new tactic induct_thm_tac: thm -> string -> int -> tactic
nipkow@9746
  1131
induct_tac th "x1 ... xn" expects th to have a conclusion of the form
nipkow@9746
  1132
P v1 ... vn and abbreviates res_inst_tac [("v1","x1"),...,("vn","xn")] th;
nipkow@9746
  1133
wenzelm@10003
  1134
* HOL/Real: "rabs" replaced by overloaded "abs" function;
nipkow@9737
  1135
wenzelm@10003
  1136
* HOL: theory Sexp now in HOL/Induct examples (it used to be part of
wenzelm@10003
  1137
main HOL, but was unused);
nipkow@8626
  1138
wenzelm@10003
  1139
* HOL: fewer consts declared as global (e.g. have to refer to
wenzelm@10003
  1140
"Lfp.lfp" instead of "lfp" internally; affects ML packages only);
wenzelm@8887
  1141
wenzelm@10003
  1142
* HOL: tuned AST representation of nested pairs, avoiding bogus output
wenzelm@10003
  1143
in case of overlap with user translations (e.g. judgements over
wenzelm@10003
  1144
tuples); (note that the underlying logical represenation is still
wenzelm@10003
  1145
bogus);
wenzelm@9349
  1146
nipkow@8412
  1147
paulson@9542
  1148
*** ZF ***
paulson@9542
  1149
wenzelm@10003
  1150
* ZF: simplification automatically cancels common terms in arithmetic
wenzelm@10003
  1151
expressions over nat and int;
paulson@9542
  1152
wenzelm@10003
  1153
* ZF: new treatment of nat to minimize type-checking: all operators
wenzelm@10003
  1154
coerce their operands to a natural number using the function natify,
wenzelm@10003
  1155
making the algebraic laws unconditional;
paulson@9542
  1156
wenzelm@10003
  1157
* ZF: as above, for int: operators coerce their operands to an integer
wenzelm@10003
  1158
using the function intify;
paulson@9542
  1159
wenzelm@10003
  1160
* ZF: the integer library now contains many of the usual laws for the
wenzelm@10003
  1161
orderings, including $<=, and monotonicity laws for $+ and $*;
paulson@9542
  1162
wenzelm@10003
  1163
* ZF: new example ZF/ex/NatSum to demonstrate integer arithmetic
wenzelm@10003
  1164
simplification;
paulson@9388
  1165
wenzelm@10003
  1166
* FOL and ZF: AddIffs now available, giving theorems of the form P<->Q
wenzelm@10003
  1167
to the simplifier and classical reasoner simultaneously;
paulson@9388
  1168
paulson@9388
  1169
wenzelm@8358
  1170
*** General ***
wenzelm@8358
  1171
wenzelm@10003
  1172
* Provers: blast_tac now handles actual object-logic rules as
wenzelm@10003
  1173
assumptions; note that auto_tac uses blast_tac internally as well;
wenzelm@10003
  1174
wenzelm@10003
  1175
* Provers: new functions rulify/rulify_no_asm: thm -> thm for turning
wenzelm@10003
  1176
outer -->/All/Ball into ==>/!!; qed_spec_mp now uses rulify_no_asm;
wenzelm@10003
  1177
wenzelm@9941
  1178
* Provers: delrules now handles destruct rules as well (no longer need
wenzelm@9941
  1179
explicit make_elim);
wenzelm@9941
  1180
wenzelm@10003
  1181
* Provers: Blast_tac now warns of and ignores "weak elimination rules" e.g.
wenzelm@10003
  1182
  [| inj ?f;          ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
wenzelm@10003
  1183
use instead the strong form,
wenzelm@10003
  1184
  [| inj ?f; ~ ?W ==> ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
wenzelm@10003
  1185
in HOL, FOL and ZF the function cla_make_elim will create such rules
wenzelm@10003
  1186
from destruct-rules;
wenzelm@9489
  1187
wenzelm@9709
  1188
* Provers: Simplifier.easy_setup provides a fast path to basic
wenzelm@9709
  1189
Simplifier setup for new object-logics;
wenzelm@9709
  1190
wenzelm@9709
  1191
* Pure: AST translation rules no longer require constant head on LHS;
wenzelm@9349
  1192
wenzelm@9709
  1193
* Pure: improved name spaces: ambiguous output is qualified; support
wenzelm@9709
  1194
for hiding of names;
wenzelm@8729
  1195
wenzelm@10003
  1196
* system: smart setup of canonical ML_HOME, ISABELLE_INTERFACE, and
wenzelm@10003
  1197
XSYMBOL_HOME; no longer need to do manual configuration in most
wenzelm@10003
  1198
situations;
wenzelm@10003
  1199
wenzelm@9709
  1200
* system: compression of ML heaps images may now be controlled via -c
wenzelm@9709
  1201
option of isabelle and isatool usedir (currently only observed by
wenzelm@9709
  1202
Poly/ML);
wenzelm@8358
  1203
wenzelm@9981
  1204
* system: isatool installfonts may handle X-Symbol fonts as well (very
wenzelm@9981
  1205
useful for remote X11);
wenzelm@9981
  1206
wenzelm@9709
  1207
* system: provide TAGS file for Isabelle sources;
wenzelm@9052
  1208
wenzelm@9288
  1209
* ML: infix 'OF' is a version of 'MRS' with more appropriate argument
wenzelm@9288
  1210
order;
wenzelm@9288
  1211
wenzelm@8994
  1212
* ML: renamed flags Syntax.trace_norm_ast to Syntax.trace_ast; global
wenzelm@8994
  1213
timing flag supersedes proof_timing and Toplevel.trace;
wenzelm@8994
  1214
wenzelm@10003
  1215
* ML: new combinators |>> and |>>> for incremental transformations
wenzelm@10003
  1216
with secondary results (e.g. certain theory extensions):
wenzelm@10003
  1217
wenzelm@9330
  1218
* ML: PureThy.add_defs gets additional argument to indicate potential
wenzelm@9330
  1219
overloading (usually false);
wenzelm@9330
  1220
wenzelm@10003
  1221
* ML: PureThy.add_thms/add_axioms/add_defs now return theorems as
wenzelm@10003
  1222
results;
wenzelm@8440
  1223
wenzelm@8358
  1224
wenzelm@8015
  1225
wenzelm@7986
  1226
New in Isabelle99 (October 1999)
wenzelm@7986
  1227
--------------------------------
oheimb@4649
  1228
paulson@5931
  1229
*** Overview of INCOMPATIBILITIES (see below for more details) ***
paulson@5931
  1230
paulson@6922
  1231
* HOL: The THEN and ELSE parts of conditional expressions (if P then x else y)
paulson@6922
  1232
are no longer simplified.  (This allows the simplifier to unfold recursive
paulson@6922
  1233
functional programs.)  To restore the old behaviour, declare
wenzelm@7215
  1234
wenzelm@7215
  1235
    Delcongs [if_weak_cong];
paulson@6922
  1236
wenzelm@6269
  1237
* HOL: Removed the obsolete syntax "Compl A"; use -A for set
wenzelm@6269
  1238
complement;
paulson@5931
  1239
wenzelm@6269
  1240
* HOL: the predicate "inj" is now defined by translation to "inj_on";
paulson@6174
  1241
berghofe@7847
  1242
* HOL/datatype: mutual_induct_tac no longer exists --
berghofe@7847
  1243
  use induct_tac "x_1 ... x_n" instead of mutual_induct_tac ["x_1", ..., "x_n"]
berghofe@7847
  1244
wenzelm@6386
  1245
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
  1246
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
  1247
wenzelm@6269
  1248
* ZF: The con_defs part of an inductive definition may no longer refer
wenzelm@6269
  1249
to constants declared in the same theory;
nipkow@6057
  1250
wenzelm@6269
  1251
* HOL, ZF: the function mk_cases, generated by the inductive
wenzelm@6269
  1252
definition package, has lost an argument.  To simplify its result, it
wenzelm@6269
  1253
uses the default simpset instead of a supplied list of theorems.
paulson@6141
  1254
wenzelm@7215
  1255
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
  1256
nipkow@7619
  1257
* Simplifier: the type of the infix ML functions
wenzelm@8729
  1258
        setSSolver addSSolver setSolver addSolver
nipkow@7619
  1259
is now  simpset * solver -> simpset  where `solver' is a new abstract type
nipkow@7619
  1260
for packaging solvers. A solver is created via
wenzelm@8729
  1261
        mk_solver: string -> (thm list -> int -> tactic) -> solver
nipkow@7619
  1262
where the string argument is only a comment.
nipkow@6057
  1263
wenzelm@7647
  1264
paulson@6069
  1265
*** Proof tools ***
paulson@6069
  1266
wenzelm@6343
  1267
* Provers/Arith/fast_lin_arith.ML contains a functor for creating a
wenzelm@6343
  1268
decision procedure for linear arithmetic. Currently it is used for
wenzelm@7593
  1269
types `nat', `int', and `real' in HOL (see below); it can, should and
wenzelm@7593
  1270
will be instantiated for other types and logics as well.
paulson@6069
  1271
nipkow@7324
  1272
* The simplifier now accepts rewrite rules with flexible heads, eg
nipkow@7324
  1273
     hom ?f ==> ?f(?x+?y) = ?f ?x + ?f ?y
nipkow@7324
  1274
  They are applied like any rule with a non-pattern lhs, i.e. by first-order
nipkow@7324
  1275
  matching.
paulson@6069
  1276
wenzelm@7593
  1277
paulson@6014
  1278
*** General ***
paulson@6014
  1279
wenzelm@7986
  1280
* New Isabelle/Isar subsystem provides an alternative to traditional
wenzelm@7215
  1281
tactical theorem proving; together with the ProofGeneral/isar user
wenzelm@7215
  1282
interface it offers an interactive environment for developing human
wenzelm@7215
  1283
readable proof documents (Isar == Intelligible semi-automated
wenzelm@7886
  1284
reasoning); for further information see isatool doc isar-ref,
wenzelm@7986
  1285
src/HOL/Isar_examples and http://isabelle.in.tum.de/Isar/
wenzelm@7886
  1286
wenzelm@9612
  1287
* improved and simplified presentation of theories: better HTML markup
wenzelm@9612
  1288
(including colors), graph views in several sizes; isatool usedir now
wenzelm@9612
  1289
provides a proper interface for user theories (via -P option); actual
wenzelm@9612
  1290
document preparation based on (PDF)LaTeX is available as well (for
wenzelm@9612
  1291
new-style theories only); see isatool doc system for more information;
wenzelm@7215
  1292
wenzelm@7252
  1293
* native support for Proof General, both for classic Isabelle and
wenzelm@7986
  1294
Isabelle/Isar;
wenzelm@7215
  1295
wenzelm@7791
  1296
* ML function thm_deps visualizes dependencies of theorems and lemmas,
wenzelm@7791
  1297
using the graph browser tool;
wenzelm@7791
  1298
wenzelm@6751
  1299
* Isabelle manuals now also available as PDF;
wenzelm@6751
  1300
wenzelm@6449
  1301
* theory loader rewritten from scratch (may not be fully
wenzelm@6449
  1302
bug-compatible); old loadpath variable has been replaced by show_path,
wenzelm@6671
  1303
add_path, del_path, reset_path functions; new operations such as
wenzelm@7593
  1304
update_thy, touch_thy, remove_thy, use/update_thy_only (see also
wenzelm@7593
  1305
isatool doc ref);
wenzelm@6449
  1306
wenzelm@7215
  1307
* improved isatool install: option -k creates KDE application icon,
wenzelm@7215
  1308
option -p DIR installs standalone binaries;
wenzelm@7215
  1309
wenzelm@7215
  1310
* added ML_PLATFORM setting (useful for cross-platform installations);
wenzelm@7215
  1311
more robust handling of platform specific ML images for SML/NJ;
wenzelm@7215
  1312
wenzelm@7886
  1313
* the settings environment is now statically scoped, i.e. it is never
wenzelm@7986
  1314
created again in sub-processes invoked from isabelle, isatool, or
wenzelm@7886
  1315
Isabelle;
wenzelm@7886
  1316
wenzelm@7215
  1317
* path element specification '~~' refers to '$ISABELLE_HOME';
wenzelm@7215
  1318
wenzelm@6343
  1319
* in locales, the "assumes" and "defines" parts may be omitted if
wenzelm@6343
  1320
empty;
wenzelm@5973
  1321
wenzelm@6269
  1322
* new print_mode "xsymbols" for extended symbol support (e.g. genuine
wenzelm@6269
  1323
long arrows);
wenzelm@6259
  1324
wenzelm@6343
  1325
* new print_mode "HTML";
wenzelm@6343
  1326
wenzelm@6343
  1327
* new flag show_tags controls display of tags of theorems (which are
wenzelm@6343
  1328
basically just comments that may be attached by some tools);
wenzelm@6343
  1329
wenzelm@6461
  1330
* Isamode 2.6 requires patch to accomodate change of Isabelle font
wenzelm@6461
  1331
mode and goal output format:
wenzelm@6461
  1332
wenzelm@6461
  1333
diff -r Isamode-2.6/elisp/isa-load.el Isamode/elisp/isa-load.el
wenzelm@6461
  1334
244c244
wenzelm@6461
  1335
<       (list (isa-getenv "ISABELLE") "-msymbols" logic-name)
wenzelm@6461
  1336
---
wenzelm@6533
  1337
>       (list (isa-getenv "ISABELLE") "-misabelle_font" "-msymbols" logic-name)
wenzelm@6461
  1338
diff -r Isabelle-2.6/elisp/isa-proofstate.el Isamode/elisp/isa-proofstate.el
wenzelm@6461
  1339
181c181
wenzelm@6461
  1340
< (defconst proofstate-proofstart-regexp "^Level [0-9]+$"
wenzelm@6461
  1341
---
wenzelm@6461
  1342
> (defconst proofstate-proofstart-regexp "^Level [0-9]+"
wenzelm@6461
  1343
wenzelm@7450
  1344
* function bind_thms stores lists of theorems (cf. bind_thm);
wenzelm@7450
  1345
wenzelm@7593
  1346
* new shorthand tactics ftac, eatac, datac, fatac;
wenzelm@7593
  1347
wenzelm@7593
  1348
* qed (and friends) now accept "" as result name; in that case the
wenzelm@7986
  1349
theorem is not stored, but proper checks and presentation of the
wenzelm@7986
  1350
result still apply;
wenzelm@7593
  1351
wenzelm@7805
  1352
* theorem database now also indexes constants "Trueprop", "all",
wenzelm@7805
  1353
"==>", "=="; thus thms_containing, findI etc. may retrieve more rules;
wenzelm@7805
  1354
oheimb@6028
  1355
nipkow@6057
  1356
*** HOL ***
nipkow@6057
  1357
wenzelm@7215
  1358
** HOL arithmetic **
wenzelm@7215
  1359
wenzelm@6343
  1360
* There are now decision procedures for linear arithmetic over nat and
wenzelm@6343
  1361
int:
nipkow@6131
  1362
wenzelm@6343
  1363
1. arith_tac copes with arbitrary formulae involving `=', `<', `<=',
wenzelm@6343
  1364
`+', `-', `Suc', `min', `max' and numerical constants; other subterms
wenzelm@6343
  1365
are treated as atomic; subformulae not involving type `nat' or `int'
wenzelm@6343
  1366
are ignored; quantified subformulae are ignored unless they are
wenzelm@6343
  1367
positive universal or negative existential. The tactic has to be
wenzelm@6343
  1368
invoked by hand and can be a little bit slow. In particular, the
wenzelm@6343
  1369
running time is exponential in the number of occurrences of `min' and
wenzelm@6343
  1370
`max', and `-' on `nat'.
nipkow@6131
  1371
wenzelm@6343
  1372
2. fast_arith_tac is a cut-down version of arith_tac: it only takes
wenzelm@6343
  1373
(negated) (in)equalities among the premises and the conclusion into
wenzelm@6343
  1374
account (i.e. no compound formulae) and does not know about `min' and
wenzelm@6343
  1375
`max', and `-' on `nat'. It is fast and is used automatically by the
wenzelm@6343
  1376
simplifier.
nipkow@6131
  1377
wenzelm@6343
  1378
NB: At the moment, these decision procedures do not cope with mixed
wenzelm@6343
  1379
nat/int formulae where the two parts interact, such as `m < n ==>
wenzelm@6343
  1380
int(m) < int(n)'.
oheimb@6028
  1381
wenzelm@7215
  1382
* HOL/Numeral provides a generic theory of numerals (encoded
wenzelm@7313
  1383
efficiently as bit strings); setup for types nat/int/real is in place;
wenzelm@7215
  1384
INCOMPATIBILITY: since numeral syntax is now polymorphic, rather than
wenzelm@7215
  1385
int, existing theories and proof scripts may require a few additional
wenzelm@7215
  1386
type constraints;
wenzelm@7215
  1387
wenzelm@7215
  1388
* integer division and remainder can now be performed on constant
wenzelm@7215
  1389
arguments;
paulson@7157
  1390
wenzelm@7215
  1391
* many properties of integer multiplication, division and remainder
wenzelm@7215
  1392
are now available;
paulson@6922
  1393
paulson@7287
  1394
* An interface to the Stanford Validity Checker (SVC) is available through the
paulson@7287
  1395
tactic svc_tac.  Propositional tautologies and theorems of linear arithmetic
paulson@7287
  1396
are proved automatically.  SVC must be installed separately, and its results
paulson@7287
  1397
must be TAKEN ON TRUST (Isabelle does not check the proofs, but tags any
paulson@7287
  1398
invocation of the underlying oracle).  For SVC see
paulson@7444
  1399
  http://verify.stanford.edu/SVC
paulson@6922
  1400
wenzelm@7125
  1401
* IsaMakefile: the HOL-Real target now builds an actual image;
wenzelm@7125
  1402
wenzelm@7215
  1403
wenzelm@7215
  1404
** HOL misc **
wenzelm@7215
  1405
wenzelm@7595
  1406
* HOL/Real/HahnBanach: the Hahn-Banach theorem for real vector spaces
wenzelm@7595
  1407
(in Isabelle/Isar) -- by Gertrud Bauer;
wenzelm@7595
  1408
wenzelm@7691
  1409
* HOL/BCV: generic model of bytecode verification, i.e. data-flow
wenzelm@7691
  1410
analysis for assembly languages with subtypes;
wenzelm@7691
  1411
wenzelm@6278
  1412
* HOL/TLA (Lamport's Temporal Logic of Actions): major reorganization
wenzelm@6278
  1413
-- avoids syntactic ambiguities and treats state, transition, and
wenzelm@6278
  1414
temporal levels more uniformly; introduces INCOMPATIBILITIES due to
wenzelm@6278
  1415
changed syntax and (many) tactics;
wenzelm@6278
  1416
wenzelm@7791
  1417
* HOL/inductive: Now also handles more general introduction rules such
wenzelm@7791
  1418
  as "ALL y. (y, x) : r --> y : acc r ==> x : acc r"; monotonicity
wenzelm@7791
  1419
  theorems are now maintained within the theory (maintained via the
wenzelm@7791
  1420
  "mono" attribute);
berghofe@7780
  1421
wenzelm@7238
  1422
* HOL/datatype: Now also handles arbitrarily branching datatypes
wenzelm@7238
  1423
  (using function types) such as
wenzelm@7238
  1424
wenzelm@7238
  1425
  datatype 'a tree = Atom 'a | Branch "nat => 'a tree"
berghofe@7047
  1426
wenzelm@7326
  1427
* HOL/record: record_simproc (part of the default simpset) takes care
wenzelm@7326
  1428
of selectors applied to updated records; record_split_tac is no longer
wenzelm@7327
  1429
part of the default claset; update_defs may now be removed from the
wenzelm@7327
  1430
simpset in many cases; COMPATIBILITY: old behavior achieved by
wenzelm@7326
  1431
wenzelm@7326
  1432
  claset_ref () := claset() addSWrapper record_split_wrapper;
wenzelm@7326
  1433
  Delsimprocs [record_simproc]
wenzelm@7326
  1434
wenzelm@6386
  1435
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
  1436
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
  1437
paulson@7287
  1438
* HOL/recdef (TFL): 'congs' syntax now expects comma separated list of theorem
paulson@7287
  1439
names rather than an ML expression;
paulson@7287
  1440
paulson@7287
  1441
* HOL/defer_recdef (TFL): like recdef but the well-founded relation can be
paulson@7287
  1442
supplied later.  Program schemes can be defined, such as
paulson@7287
  1443
    "While B C s = (if B s then While B C (C s) else s)"
paulson@7287
  1444
where the well-founded relation can be chosen after B and C have been given.
wenzelm@6563
  1445
wenzelm@7215
  1446
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
  1447
INCOMPATIBILITY: while [] and infix # syntax is still there, of
wenzelm@7215
  1448
course, ML tools referring to List.list.op # etc. have to be adapted;
wenzelm@7215
  1449
wenzelm@7238
  1450
* HOL_quantifiers flag superseded by "HOL" print mode, which is
wenzelm@7238
  1451
disabled by default; run isabelle with option -m HOL to get back to
wenzelm@7238
  1452
the original Gordon/HOL-style output;
wenzelm@7238
  1453
wenzelm@7238
  1454
* HOL/Ord.thy: new bounded quantifier syntax (input only): ALL x<y. P,
wenzelm@7238
  1455
ALL x<=y. P, EX x<y. P, EX x<=y. P;
wenzelm@7238
  1456
wenzelm@7238
  1457
* HOL basic syntax simplified (more orthogonal): all variants of
wenzelm@7238
  1458
All/Ex now support plain / symbolic / HOL notation; plain syntax for
wenzelm@7238
  1459
Eps operator is provided as well: "SOME x. P[x]";
wenzelm@7238
  1460
berghofe@7320
  1461
* HOL/Sum.thy: sum_case has been moved to HOL/Datatype;
wenzelm@7261
  1462
wenzelm@7280
  1463
* HOL/Univ.thy: infix syntax <*>, <+>, <**>, <+> eliminated and made
wenzelm@7280
  1464
thus available for user theories;
wenzelm@7280
  1465
wenzelm@7300
  1466
* HOLCF/IOA/Sequents: renamed 'Cons' to 'Consq' to avoid clash with
wenzelm@7300
  1467
HOL/List; hardly an INCOMPATIBILITY since '>>' syntax is used all the
wenzelm@7300
  1468
time;
wenzelm@7300
  1469
wenzelm@7986
  1470
* HOL: new tactic smp_tac: int -> int -> tactic, which applies spec
wenzelm@7986
  1471
several times and then mp;
oheimb@7492
  1472
wenzelm@7215
  1473
paulson@7113
  1474
*** LK ***
paulson@7113
  1475
wenzelm@7215
  1476
* the notation <<...>> is now available as a notation for sequences of
wenzelm@7215
  1477
formulas;
paulson@7113
  1478
paulson@7113
  1479
* the simplifier is now installed
paulson@7113
  1480
wenzelm@8729
  1481
* the axiom system has been generalized (thanks to Soren Heilmann)
paulson@7113
  1482
paulson@7113
  1483
* the classical reasoner now has a default rule database
paulson@7113
  1484
paulson@7113
  1485
paulson@6064
  1486
*** ZF ***
paulson@6064
  1487
paulson@6064
  1488
* new primrec section allows primitive recursive functions to be given
wenzelm@6269
  1489
directly (as in HOL) over datatypes and the natural numbers;
paulson@6064
  1490
wenzelm@6269
  1491
* new tactics induct_tac and exhaust_tac for induction (or case
wenzelm@6269
  1492
analysis) over datatypes and the natural numbers;
paulson@6064
  1493
paulson@6064
  1494
* the datatype declaration of type T now defines the recursor T_rec;
paulson@6064
  1495
paulson@6141
  1496
* simplification automatically does freeness reasoning for datatype
wenzelm@6269
  1497
constructors;
paulson@6141
  1498
wenzelm@6269
  1499
* automatic type-inference, with AddTCs command to insert new
wenzelm@6269
  1500
type-checking rules;
paulson@6155
  1501
wenzelm@6269
  1502
* datatype introduction rules are now added as Safe Introduction rules
wenzelm@6269
  1503
to the claset;
paulson@6155
  1504
wenzelm@6269
  1505
* the syntax "if P then x else y" is now available in addition to
wenzelm@6269
  1506
if(P,x,y);
wenzelm@6269
  1507
paulson@6069
  1508
wenzelm@6343
  1509
*** Internal programming interfaces ***
wenzelm@6343
  1510
wenzelm@7919
  1511
* tuned simplifier trace output; new flag debug_simp;
wenzelm@7919
  1512
wenzelm@7420
  1513
* structures Vartab / Termtab (instances of TableFun) offer efficient
wenzelm@7420
  1514
tables indexed by indexname_ord / term_ord (compatible with aconv);
wenzelm@7420
  1515
wenzelm@6386
  1516
* AxClass.axclass_tac lost the theory argument;
wenzelm@6386
  1517
wenzelm@6343
  1518
* tuned current_goals_markers semantics: begin / end goal avoids
wenzelm@6343
  1519
printing empty lines;
wenzelm@6343
  1520
wenzelm@6343
  1521
* removed prs and prs_fn hook, which was broken because it did not
wenzelm@6343
  1522
include \n in its semantics, forcing writeln to add one
wenzelm@6343
  1523
uncoditionally; replaced prs_fn by writeln_fn; consider std_output:
wenzelm@6343
  1524
string -> unit if you really want to output text without newline;
wenzelm@6343
  1525
wenzelm@6343
  1526
* Symbol.output subject to print mode; INCOMPATIBILITY: defaults to
wenzelm@6343
  1527
plain output, interface builders may have to enable 'isabelle_font'
wenzelm@6343
  1528
mode to get Isabelle font glyphs as before;
wenzelm@6343
  1529
wenzelm@6343
  1530
* refined token_translation interface; INCOMPATIBILITY: output length
wenzelm@6343
  1531
now of type real instead of int;
wenzelm@6343
  1532
wenzelm@7196
  1533
* theory loader actions may be traced via new ThyInfo.add_hook
wenzelm@7196
  1534
interface (see src/Pure/Thy/thy_info.ML); example application: keep
wenzelm@7196
  1535
your own database of information attached to *whole* theories -- as
wenzelm@7196
  1536
opposed to intra-theory data slots offered via TheoryDataFun;
wenzelm@7196
  1537
wenzelm@7647
  1538
* proper handling of dangling sort hypotheses (at last!);
wenzelm@7647
  1539
Thm.strip_shyps and Drule.strip_shyps_warning take care of removing
wenzelm@7647
  1540
extra sort hypotheses that can be witnessed from the type signature;
wenzelm@7986
  1541
the force_strip_shyps flag is gone, any remaining shyps are simply
wenzelm@7986
  1542
left in the theorem (with a warning issued by strip_shyps_warning);
wenzelm@7647
  1543
wenzelm@6343
  1544
paulson@6064
  1545
wenzelm@5781
  1546
New in Isabelle98-1 (October 1998)
wenzelm@5781
  1547
----------------------------------
wenzelm@5781
  1548
wenzelm@5127
  1549
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4842
  1550
wenzelm@5726
  1551
* several changes of automated proof tools;
wenzelm@5373
  1552
wenzelm@5726
  1553
* HOL: major changes to the inductive and datatype packages, including
wenzelm@5726
  1554
some minor incompatibilities of theory syntax;
berghofe@5214
  1555
wenzelm@5726
  1556
* HOL: renamed r^-1 to 'converse' from 'inverse'; 'inj_onto' is now
wenzelm@5217
  1557
called `inj_on';
paulson@5160
  1558
nipkow@5275
  1559
* HOL: removed duplicate thms in Arith:
nipkow@5275
  1560
  less_imp_add_less  should be replaced by  trans_less_add1
nipkow@5275
  1561
  le_imp_add_le      should be replaced by  trans_le_add1
paulson@5160
  1562
wenzelm@5726
  1563
* HOL: unary minus is now overloaded (new type constraints may be
wenzelm@5726
  1564
required);
paulson@5490
  1565
wenzelm@5726
  1566
* HOL and ZF: unary minus for integers is now #- instead of #~.  In
wenzelm@5726
  1567
ZF, expressions such as n#-1 must be changed to n#- 1, since #-1 is
wenzelm@5726
  1568
now taken as an integer constant.
paulson@5541
  1569
wenzelm@5726
  1570
* Pure: ML function 'theory_of' renamed to 'theory';
wenzelm@5397
  1571
wenzelm@5363
  1572
wenzelm@5127
  1573
*** Proof tools ***
nipkow@4880
  1574
nipkow@5657
  1575
* Simplifier:
nipkow@5657
  1576
  1. Asm_full_simp_tac is now more aggressive.
nipkow@5657
  1577
     1. It will sometimes reorient premises if that increases their power to
nipkow@5657
  1578
        simplify.
nipkow@5657
  1579
     2. It does no longer proceed strictly from left to right but may also
nipkow@5657
  1580
        rotate premises to achieve further simplification.
nipkow@5657
  1581
     For compatibility reasons there is now Asm_lr_simp_tac which is like the
nipkow@5657
  1582
     old Asm_full_simp_tac in that it does not rotate premises.
nipkow@5657
  1583
  2. The simplifier now knows a little bit about nat-arithmetic.
nipkow@4880
  1584
wenzelm@5127
  1585
* Classical reasoner: wrapper mechanism for the classical reasoner now
wenzelm@5127
  1586
allows for selected deletion of wrappers, by introduction of names for
wenzelm@5127
  1587
wrapper functionals.  This implies that addbefore, addSbefore,
wenzelm@5127
  1588
addaltern, and addSaltern now take a pair (name, tactic) as argument,
wenzelm@5127
  1589
and that adding two tactics with the same name overwrites the first
wenzelm@5127
  1590
one (emitting a warning).
oheimb@4824
  1591
  type wrapper = (int -> tactic) -> (int -> tactic)
oheimb@4649
  1592
  setWrapper, setSWrapper, compWrapper and compSWrapper are replaced by
oheimb@4824
  1593
  addWrapper, addSWrapper: claset * (string * wrapper) -> claset
oheimb@4824
  1594
  delWrapper, delSWrapper: claset *  string            -> claset
oheimb@4649
  1595
  getWrapper is renamed to appWrappers, getSWrapper to appSWrappers;
oheimb@4649
  1596
wenzelm@5705
  1597
* Classical reasoner: addbefore/addSbefore now have APPEND/ORELSE
wenzelm@5726
  1598
semantics; addbefore now affects only the unsafe part of step_tac
wenzelm@5726
  1599
etc.; this affects addss/auto_tac/force_tac, so EXISTING PROOFS MAY
wenzelm@5726
  1600
FAIL, but proofs should be fixable easily, e.g. by replacing Auto_tac
wenzelm@5726
  1601
by Force_tac;
oheimb@5524
  1602
wenzelm@5726
  1603
* Classical reasoner: setwrapper to setWrapper and compwrapper to
wenzelm@5726
  1604
compWrapper; added safe wrapper (and access functions for it);
oheimb@5524
  1605
wenzelm@5127
  1606
* HOL/split_all_tac is now much faster and fails if there is nothing
wenzelm@5726
  1607
to split.  Some EXISTING PROOFS MAY REQUIRE ADAPTION because the order
wenzelm@5726
  1608
and the names of the automatically generated variables have changed.
wenzelm@5726
  1609
split_all_tac has moved within claset() from unsafe wrappers to safe
wenzelm@5726
  1610
wrappers, which means that !!-bound variables are split much more
wenzelm@5726
  1611
aggressively, and safe_tac and clarify_tac now split such variables.
wenzelm@5726
  1612
If this splitting is not appropriate, use delSWrapper "split_all_tac".
wenzelm@5726
  1613
Note: the same holds for record_split_tac, which does the job of
wenzelm@5726
  1614
split_all_tac for record fields.
wenzelm@5127
  1615
wenzelm@5726
  1616
* HOL/Simplifier: Rewrite rules for case distinctions can now be added
wenzelm@5726
  1617
permanently to the default simpset using Addsplits just like
wenzelm@5726
  1618
Addsimps. They can be removed via Delsplits just like
wenzelm@5726
  1619
Delsimps. Lower-case versions are also available.
wenzelm@5127
  1620
wenzelm@5726
  1621
* HOL/Simplifier: The rule split_if is now part of the default
wenzelm@5726
  1622
simpset. This means that the simplifier will eliminate all occurrences
wenzelm@5726
  1623
of if-then-else in the conclusion of a goal. To prevent this, you can
wenzelm@5726
  1624
either remove split_if completely from the default simpset by
wenzelm@5726
  1625
`Delsplits [split_if]' or remove it in a specific call of the
wenzelm@5726
  1626
simplifier using `... delsplits [split_if]'.  You can also add/delete
wenzelm@5726
  1627
other case splitting rules to/from the default simpset: every datatype
wenzelm@5726
  1628
generates suitable rules `split_t_case' and `split_t_case_asm' (where
wenzelm@5726
  1629
t is the name of the datatype).
wenzelm@5127
  1630
wenzelm@5726
  1631
* Classical reasoner / Simplifier combination: new force_tac (and
wenzelm@5127
  1632
derivatives Force_tac, force) combines rewriting and classical
wenzelm@5127
  1633
reasoning (and whatever other tools) similarly to auto_tac, but is
wenzelm@5726
  1634
aimed to solve the given subgoal completely.
wenzelm@5127
  1635
wenzelm@5127
  1636
wenzelm@5127
  1637
*** General ***
wenzelm@5127
  1638
wenzelm@5217
  1639
* new top-level commands `Goal' and `Goalw' that improve upon `goal'
wenzelm@5127
  1640
and `goalw': the theory is no longer needed as an explicit argument -
wenzelm@5127
  1641
the current theory context is used; assumptions are no longer returned
wenzelm@5127
  1642
at the ML-level unless one of them starts with ==> or !!; it is
wenzelm@5217
  1643
recommended to convert to these new commands using isatool fixgoal
wenzelm@5217
  1644
(backup your sources first!);
wenzelm@4842
  1645
wenzelm@5217
  1646
* new top-level commands 'thm' and 'thms' for retrieving theorems from
wenzelm@5207
  1647
the current theory context, and 'theory' to lookup stored theories;
paulson@4806
  1648
paulson@5722
  1649
* new theory section 'locale' for declaring constants, assumptions and
paulson@5722
  1650
definitions that have local scope;
paulson@5722
  1651
wenzelm@5127
  1652
* new theory section 'nonterminals' for purely syntactic types;
wenzelm@4858
  1653
wenzelm@5127
  1654
* new theory section 'setup' for generic ML setup functions
wenzelm@5127
  1655
(e.g. package initialization);
wenzelm@4869
  1656
wenzelm@5131
  1657
* the distribution now includes Isabelle icons: see
wenzelm@5131
  1658
lib/logo/isabelle-{small,tiny}.xpm;
wenzelm@5131
  1659
wenzelm@5363
  1660
* isatool install - install binaries with absolute references to
wenzelm@5363
  1661
ISABELLE_HOME/bin;
wenzelm@5363
  1662
wenzelm@5572
  1663
* isatool logo -- create instances of the Isabelle logo (as EPS);
wenzelm@5572
  1664
wenzelm@5407
  1665
* print mode 'emacs' reserved for Isamode;
wenzelm@5407
  1666
wenzelm@5726
  1667
* support multiple print (ast) translations per constant name;
wenzelm@5726
  1668
wenzelm@6925
  1669
* theorems involving oracles are now printed with a suffixed [!];
wenzelm@6925
  1670
wenzelm@4711
  1671
paulson@4661
  1672
*** HOL ***
paulson@4661
  1673
wenzelm@5710
  1674
* there is now a tutorial on Isabelle/HOL (do 'isatool doc tutorial');
nipkow@5709
  1675
wenzelm@5217
  1676
* HOL/inductive package reorganized and improved: now supports mutual
paulson@5267
  1677
definitions such as
wenzelm@5217
  1678
wenzelm@5217
  1679
  inductive EVEN ODD
wenzelm@5217
  1680
    intrs
wenzelm@5217
  1681
      null "0 : EVEN"
wenzelm@5217
  1682
      oddI "n : EVEN ==> Suc n : ODD"
wenzelm@5217
  1683
      evenI "n : ODD ==> Suc n : EVEN"
wenzelm@5217
  1684
wenzelm@5217
  1685
new theorem list "elims" contains an elimination rule for each of the
wenzelm@5217
  1686
recursive sets; inductive definitions now handle disjunctive premises
wenzelm@5217
  1687
correctly (also ZF);
berghofe@5214
  1688
wenzelm@5217
  1689
INCOMPATIBILITIES: requires Inductive as an ancestor; component
wenzelm@5217
  1690
"mutual_induct" no longer exists - the induction rule is always
wenzelm@5217
  1691
contained in "induct";
wenzelm@5217
  1692
wenzelm@5217
  1693
wenzelm@5217
  1694
* HOL/datatype package re-implemented and greatly improved: now
paulson@5267
  1695
supports mutually recursive datatypes such as
wenzelm@5217
  1696
wenzelm@5217
  1697
  datatype
wenzelm@5217
  1698
    'a aexp = IF_THEN_ELSE ('a bexp) ('a aexp) ('a aexp)
wenzelm@5217
  1699
            | SUM ('a aexp) ('a aexp)
wenzelm@5217
  1700
            | DIFF ('a aexp) ('a aexp)
wenzelm@5217
  1701
            | NUM 'a
wenzelm@5217
  1702
  and
wenzelm@5217
  1703
    'a bexp = LESS ('a aexp) ('a aexp)
wenzelm@5217
  1704
            | AND ('a bexp) ('a bexp)
wenzelm@5217
  1705
            | OR ('a bexp) ('a bexp)
wenzelm@5217
  1706
paulson@5267
  1707
as well as indirectly recursive datatypes such as
berghofe@5214
  1708
wenzelm@5217
  1709
  datatype
wenzelm@5217
  1710
    ('a, 'b) term = Var 'a
wenzelm@5217
  1711
                  | App 'b ((('a, 'b) term) list)
berghofe@5214
  1712
wenzelm@5217
  1713
The new tactic  mutual_induct_tac [<var_1>, ..., <var_n>] i  performs
wenzelm@5217
  1714
induction on mutually / indirectly recursive datatypes.
wenzelm@5217
  1715
wenzelm@5217
  1716
Primrec equations are now stored in theory and can be accessed via
wenzelm@5217
  1717
<function_name>.simps.
wenzelm@5217
  1718
wenzelm@5217
  1719
INCOMPATIBILITIES:
berghofe@5214
  1720
wenzelm@5217
  1721
  - Theories using datatypes must now have theory Datatype as an
wenzelm@5217
  1722
    ancestor.
wenzelm@5217
  1723
  - The specific <typename>.induct_tac no longer exists - use the
wenzelm@5217
  1724
    generic induct_tac instead.
berghofe@5226
  1725
  - natE has been renamed to nat.exhaust - use exhaust_tac
wenzelm@5217
  1726
    instead of res_inst_tac ... natE. Note that the variable
berghofe@5226
  1727
    names in nat.exhaust differ from the names in natE, this
wenzelm@5217
  1728
    may cause some "fragile" proofs to fail.
wenzelm@5217
  1729
  - The theorems split_<typename>_case and split_<typename>_case_asm
wenzelm@5217
  1730
    have been renamed to <typename>.split and <typename>.split_asm.
wenzelm@5217
  1731
  - Since default sorts of type variables are now handled correctly,
wenzelm@5217
  1732
    some datatype definitions may have to be annotated with explicit
wenzelm@5217
  1733
    sort constraints.
wenzelm@5217
  1734
  - Primrec definitions no longer require function name and type
wenzelm@5217
  1735
    of recursive argument.
berghofe@5214
  1736
wenzelm@5217
  1737
Consider using isatool fixdatatype to adapt your theories and proof
wenzelm@5217
  1738
scripts to the new package (backup your sources first!).
wenzelm@5217
  1739
wenzelm@5217
  1740
wenzelm@5726
  1741
* HOL/record package: considerably improved implementation; now
wenzelm@5726
  1742
includes concrete syntax for record types, terms, updates; theorems
wenzelm@5726
  1743
for surjective pairing and splitting !!-bound record variables; proof
wenzelm@5726
  1744
support is as follows:
wenzelm@5726
  1745
wenzelm@5726
  1746
  1) standard conversions (selectors or updates applied to record
wenzelm@5726
  1747
constructor terms) are part of the standard simpset;
wenzelm@5726
  1748
wenzelm@5726
  1749
  2) inject equations of the form ((x, y) = (x', y')) == x=x' & y=y' are
wenzelm@5726
  1750
made part of standard simpset and claset via addIffs;
wenzelm@5726
  1751
wenzelm@5726
  1752
  3) a tactic for record field splitting (record_split_tac) is part of
wenzelm@5726
  1753
the standard claset (addSWrapper);
wenzelm@5726
  1754
wenzelm@5726
  1755
To get a better idea about these rules you may retrieve them via
wenzelm@5726
  1756
something like 'thms "foo.simps"' or 'thms "foo.iffs"', where "foo" is
wenzelm@5726
  1757
the name of your record type.
wenzelm@5726
  1758
wenzelm@5726
  1759
The split tactic 3) conceptually simplifies by the following rule:
wenzelm@5726
  1760
wenzelm@5726
  1761
  "(!!x. PROP ?P x) == (!!a b. PROP ?P (a, b))"
wenzelm@5726
  1762
wenzelm@5726
  1763
Thus any record variable that is bound by meta-all will automatically
wenzelm@5726
  1764
blow up into some record constructor term, consequently the
wenzelm@5726
  1765
simplifications of 1), 2) apply.  Thus force_tac, auto_tac etc. shall
wenzelm@5726
  1766
solve record problems automatically.
wenzelm@5726
  1767
berghofe@5214
  1768
wenzelm@5125
  1769
* reorganized the main HOL image: HOL/Integ and String loaded by
wenzelm@5125
  1770
default; theory Main includes everything;
wenzelm@5125
  1771
paulson@5650
  1772
* automatic simplification of integer sums and comparisons, using cancellation;
paulson@5650
  1773
oheimb@5526
  1774
* added option_map_eq_Some and not_Some_eq to the default simpset and claset;
wenzelm@5127
  1775
wenzelm@5127
  1776
* added disj_not1 = "(~P | Q) = (P --> Q)" to the default simpset;
wenzelm@5127
  1777
wenzelm@5127
  1778
* many new identities for unions, intersections, set difference, etc.;
wenzelm@5127
  1779
wenzelm@5127
  1780
* expand_if, expand_split, expand_sum_case and expand_nat_case are now
wenzelm@5127
  1781
called split_if, split_split, split_sum_case and split_nat_case (to go
wenzelm@5127
  1782
with add/delsplits);
wenzelm@5125
  1783
wenzelm@5127
  1784
* HOL/Prod introduces simplification procedure unit_eq_proc rewriting
wenzelm@5127
  1785
(?x::unit) = (); this is made part of the default simpset, which COULD
wenzelm@5127
  1786
MAKE EXISTING PROOFS FAIL under rare circumstances (consider
wenzelm@5207
  1787
'Delsimprocs [unit_eq_proc];' as last resort); also note that
wenzelm@5207
  1788
unit_abs_eta_conv is added in order to counter the effect of
wenzelm@5207
  1789
unit_eq_proc on (%u::unit. f u), replacing it by f rather than by
wenzelm@5207
  1790
%u.f();
wenzelm@5125
  1791
wenzelm@5217
  1792
* HOL/Fun INCOMPATIBILITY: `inj_onto' is now called `inj_on' (which
wenzelm@5217
  1793
makes more sense);
berghofe@5109
  1794
paulson@5475
  1795
* HOL/Set INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
  1796
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
  1797
  disjointness reasoning but breaking a few old proofs.
paulson@5267
  1798
wenzelm@5217
  1799
* HOL/Relation INCOMPATIBILITY: renamed the relational operator r^-1
wenzelm@5217
  1800
to 'converse' from 'inverse' (for compatibility with ZF and some
wenzelm@5217
  1801
literature);
wenzelm@5085
  1802
wenzelm@5127
  1803
* HOL/recdef can now declare non-recursive functions, with {} supplied as
wenzelm@5127
  1804
the well-founded relation;
oheimb@4838
  1805
paulson@5490
  1806
* HOL/Set INCOMPATIBILITY: the complement of set A is now written -A instead of
paulson@5490
  1807
    Compl A.  The "Compl" syntax remains available as input syntax for this
paulson@5490
  1808
    release ONLY.
paulson@5490
  1809
wenzelm@5127
  1810
* HOL/Update: new theory of function updates:
wenzelm@5127
  1811
    f(a:=b) == %x. if x=a then b else f x
wenzelm@5127
  1812
may also be iterated as in f(a:=b,c:=d,...);
nipkow@5077
  1813
wenzelm@5127
  1814
* HOL/Vimage: new theory for inverse image of a function, syntax f-``B;
paulson@4899
  1815
nipkow@5282
  1816
* HOL/List:
nipkow@5282
  1817
  - new function list_update written xs[i:=v] that updates the i-th
nipkow@5282
  1818
    list position. May also be iterated as in xs[i:=a,j:=b,...].
nipkow@5428
  1819
  - new function `upt' written [i..j(] which generates the list
nipkow@5428
  1820
    [i,i+1,...,j-1], i.e. the upper bound is excluded. To include the upper
nipkow@5428
  1821
    bound write [i..j], which is a shorthand for [i..j+1(].
nipkow@5282
  1822
  - new lexicographic orderings and corresponding wellfoundedness theorems.
paulson@4779
  1823
wenzelm@5127
  1824
* HOL/Arith:
wenzelm@5127
  1825
  - removed 'pred' (predecessor) function;
wenzelm@5127
  1826
  - generalized some theorems about n-1;
wenzelm@5127
  1827
  - many new laws about "div" and "mod";
wenzelm@5127
  1828
  - new laws about greatest common divisors (see theory ex/Primes);
oheimb@4766
  1829
wenzelm@5127
  1830
* HOL/Relation: renamed the relational operator r^-1 "converse"
wenzelm@4842
  1831
instead of "inverse";
wenzelm@4711
  1832
nipkow@5651
  1833
* HOL/Induct/Multiset: a theory of multisets, including the wellfoundedness
nipkow@5651
  1834
  of the multiset ordering;
nipkow@5651
  1835
wenzelm@5127
  1836
* directory HOL/Real: a construction of the reals using Dedekind cuts
nipkow@5651
  1837
  (not included by default);
nipkow@4835
  1838
wenzelm@5127
  1839
* directory HOL/UNITY: Chandy and Misra's UNITY formalism;
wenzelm@4711
  1840
nipkow@5651
  1841
* directory HOL/Hoare: a new version of Hoare logic which permits many-sorted
nipkow@5651
  1842
  programs, i.e. different program variables may have different types.
nipkow@5651
  1843
paulson@5142
  1844
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
  1845
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
  1846
  Now rew can involve either definitions or equalities (either == or =).
wenzelm@5002
  1847
wenzelm@5363
  1848
paulson@4879
  1849
*** ZF ***
paulson@4879
  1850
paulson@5332
  1851
* theory Main includes everything; INCOMPATIBILITY: theory ZF.thy contains
paulson@5332
  1852
  only the theorems proved on ZF.ML;
paulson@5160
  1853
paulson@5475
  1854
* ZF INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
  1855
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
  1856
  disjointness reasoning but breaking a few old proofs.
paulson@5267
  1857
paulson@5160
  1858
* ZF/Update: new theory of function updates
paulson@5160
  1859
    with default rewrite rule  f(x:=y) ` z = if(z=x, y, f`z)
paulson@5160
  1860
  may also be iterated as in f(a:=b,c:=d,...);
paulson@5160
  1861
paulson@4879
  1862
* in  let x=t in u(x), neither t nor u(x) has to be an FOL term.
oheimb@4649
  1863
paulson@5142
  1864
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
  1865
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
  1866
  Now rew can involve either definitions or equalities (either == or =).
paulson@5142
  1867
paulson@5160
  1868
* case_tac provided for compatibility with HOL
paulson@5160
  1869
    (like the old excluded_middle_tac, but with subgoals swapped)
paulson@5160
  1870
wenzelm@4842
  1871
wenzelm@5127
  1872
*** Internal programming interfaces ***
wenzelm@5002
  1873
wenzelm@5251
  1874
* Pure: several new basic modules made available for general use, see
wenzelm@5251
  1875
also src/Pure/README;
wenzelm@5207
  1876
wenzelm@5008
  1877
* improved the theory data mechanism to support encapsulation (data
wenzelm@5008
  1878
kind name replaced by private Object.kind, acting as authorization
wenzelm@5373
  1879
key); new type-safe user interface via functor TheoryDataFun; generic
wenzelm@5373
  1880
print_data function becomes basically useless;
wenzelm@5002
  1881
wenzelm@5251
  1882
* removed global_names compatibility flag -- all theory declarations
wenzelm@5251
  1883
are qualified by default;
wenzelm@5251
  1884
wenzelm@5085
  1885
* module Pure/Syntax now offers quote / antiquote translation
wenzelm@5085
  1886
functions (useful for Hoare logic etc. with implicit dependencies);
wenzelm@5373
  1887
see HOL/ex/Antiquote for an example use;
wenzelm@5085
  1888
wenzelm@5127
  1889
* Simplifier now offers conversions (asm_)(full_)rewrite: simpset ->
wenzelm@5127
  1890
cterm -> thm;
wenzelm@5127
  1891
wenzelm@5207
  1892
* new tactical CHANGED_GOAL for checking that a tactic modifies a
wenzelm@5207
  1893
subgoal;
paulson@5142
  1894
wenzelm@5251
  1895
* Display.print_goals function moved to Locale.print_goals;
wenzelm@5251
  1896
wenzelm@5731
  1897
* standard print function for goals supports current_goals_markers
wenzelm@5731
  1898
variable for marking begin of proof, end of proof, start of goal; the
wenzelm@5731
  1899
default is ("", "", ""); setting current_goals_markers := ("<proof>",
wenzelm@5731
  1900
"</proof>", "<goal>") causes SGML like tagged proof state printing,
wenzelm@5731
  1901
for example;
wenzelm@5731
  1902
wenzelm@5002
  1903
wenzelm@5002
  1904
wenzelm@4410
  1905
New in Isabelle98 (January 1998)
wenzelm@4410
  1906
--------------------------------
wenzelm@4410
  1907
wenzelm@4410
  1908
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4410
  1909
wenzelm@4410
  1910
* changed lexical syntax of terms / types: dots made part of long
wenzelm@4410
  1911
identifiers, e.g. "%x.x" no longer possible, should be "%x. x";
wenzelm@4410
  1912
wenzelm@4410
  1913
* simpset (and claset) reference variable replaced by functions
wenzelm@4410
  1914
simpset / simpset_ref;
wenzelm@4410
  1915
wenzelm@4410
  1916
* no longer supports theory aliases (via merge) and non-trivial
wenzelm@4410
  1917
implicit merge of thms' signatures;
wenzelm@4410
  1918
wenzelm@4410
  1919
* most internal names of constants changed due to qualified names;
wenzelm@4410
  1920
wenzelm@4410
  1921
* changed Pure/Sequence interface (see Pure/seq.ML);
wenzelm@4410
  1922
wenzelm@3454
  1923
paulson@3715
  1924
*** General Changes ***
paulson@3715
  1925
wenzelm@4174
  1926
* hierachically structured name spaces (for consts, types, axms, thms
wenzelm@3943
  1927
etc.); new lexical class 'longid' (e.g. Foo.bar.x) may render much of
wenzelm@4108
  1928
old input syntactically incorrect (e.g. "%x.x"); COMPATIBILITY:
wenzelm@4108
  1929
isatool fixdots ensures space after dots (e.g. "%x. x"); set
wenzelm@4174
  1930
long_names for fully qualified output names; NOTE: ML programs
wenzelm@4174
  1931
(special tactics, packages etc.) referring to internal names may have
wenzelm@4174
  1932
to be adapted to cope with fully qualified names; in case of severe
wenzelm@4174
  1933
backward campatibility problems try setting 'global_names' at compile
wenzelm@4174
  1934
time to have enrything declared within a flat name space; one may also
wenzelm@4174
  1935
fine tune name declarations in theories via the 'global' and 'local'
wenzelm@4174
  1936
section;
wenzelm@4108
  1937
wenzelm@4108
  1938
* reimplemented the implicit simpset and claset using the new anytype
wenzelm@4108
  1939
data filed in signatures; references simpset:simpset ref etc. are
wenzelm@4108
  1940
replaced by functions simpset:unit->simpset and
wenzelm@4108
  1941
simpset_ref:unit->simpset ref; COMPATIBILITY: use isatool fixclasimp
wenzelm@4108
  1942
to patch your ML files accordingly;
paulson@3856
  1943
wenzelm@3857
  1944
* HTML output now includes theory graph data for display with Java
wenzelm@3857
  1945
applet or isatool browser; data generated automatically via isatool
wenzelm@3901
  1946
usedir (see -i option, ISABELLE_USEDIR_OPTIONS);
wenzelm@3857
  1947
paulson@3856
  1948
* defs may now be conditional; improved rewrite_goals_tac to handle
paulson@3856
  1949
conditional equations;
paulson@3856
  1950
wenzelm@4174
  1951
* defs now admits additional type arguments, using TYPE('a) syntax;
wenzelm@4174
  1952
wenzelm@3901
  1953
* theory aliases via merge (e.g. M=A+B+C) no longer supported, always
wenzelm@3901
  1954
creates a new theory node; implicit merge of thms' signatures is
wenzelm@4112
  1955
restricted to 'trivial' ones; COMPATIBILITY: one may have to use
wenzelm@3901
  1956
transfer:theory->thm->thm in (rare) cases;
wenzelm@3901
  1957
wenzelm@3968
  1958
* improved handling of draft signatures / theories; draft thms (and
wenzelm@3968
  1959
ctyps, cterms) are automatically promoted to real ones;
wenzelm@3968
  1960
wenzelm@3901
  1961
* slightly changed interfaces for oracles: admit many per theory, named
wenzelm@3901
  1962
(e.g. oracle foo = mlfun), additional name argument for invoke_oracle;
wenzelm@3901
  1963
wenzelm@3901
  1964
* print_goals: optional output of const types (set show_consts and
wenzelm@3901
  1965
show_types);
wenzelm@3851
  1966
wenzelm@4388
  1967
* improved output of warnings (###) and errors (***);
wenzelm@3697
  1968
paulson@4178
  1969
* subgoal_tac displays a warning if the new subgoal has type variables;
paulson@4178
  1970
paulson@3715
  1971
* removed old README and Makefiles;
wenzelm@3697
  1972
paulson@3856
  1973
* replaced print_goals_ref hook by print_current_goals_fn and result_error_fn;
wenzelm@3670
  1974
paulson@3715
  1975
* removed obsolete init_pps and init_database;
paulson@3715
  1976
paulson@3715
  1977
* deleted the obsolete tactical STATE, which was declared by
paulson@3715
  1978
    fun STATE tacfun st = tacfun st st;
paulson@3715
  1979
wenzelm@4388
  1980
* cd and use now support path variables, e.g. $ISABELLE_HOME, or ~
wenzelm@4388
  1981
(which abbreviates $HOME);
wenzelm@4269
  1982
wenzelm@4269
  1983
* changed Pure/Sequence interface (see Pure/seq.ML); COMPATIBILITY:
wenzelm@4269
  1984
use isatool fixseq to adapt your ML programs (this works for fully
wenzelm@4269
  1985
qualified references to the Sequence structure only!);
wenzelm@4269
  1986
wenzelm@4381
  1987
* use_thy no longer requires writable current directory; it always
wenzelm@4381
  1988
reloads .ML *and* .thy file, if either one is out of date;
wenzelm@4269
  1989
paulson@3715
  1990
paulson@3715
  1991
*** Classical Reasoner ***
paulson@3715
  1992
wenzelm@3744
  1993
* Clarify_tac, clarify_tac, clarify_step_tac, Clarify_step_tac: new
wenzelm@3744
  1994
tactics that use classical reasoning to simplify a subgoal without
wenzelm@3744
  1995
splitting it into several subgoals;
paulson@3715
  1996
paulson@3719
  1997
* Safe_tac: like safe_tac but uses the default claset;
paulson@3719
  1998
paulson@3715
  1999
paulson@3715
  2000
*** Simplifier ***
paulson@3715
  2001
paulson@3715
  2002
* added simplification meta rules:
paulson@3715
  2003
    (asm_)(full_)simplify: simpset -> thm -> thm;
paulson@3715
  2004
paulson@3715
  2005
* simplifier.ML no longer part of Pure -- has to be loaded by object
paulson@3715
  2006
logics (again);
paulson@3715
  2007
paulson@3715
  2008
* added prems argument to simplification procedures;
paulson@3715
  2009
paulson@4325
  2010
* HOL, FOL, ZF: added infix function `addsplits':
paulson@4325
  2011
  instead of `<simpset> setloop (split_tac <thms>)'
paulson@4325
  2012
  you can simply write `<simpset> addsplits <thms>'
paulson@4325
  2013
paulson@3715
  2014
paulson@3715
  2015
*** Syntax ***
paulson@3715
  2016
wenzelm@4174
  2017
* TYPE('a) syntax for type reflection terms;
wenzelm@4174
  2018
wenzelm@3985
  2019
* no longer handles consts with name "" -- declare as 'syntax' instead;
paulson@3856
  2020
paulson@3856
  2021
* pretty printer: changed order of mixfix annotation preference (again!);
wenzelm@3846
  2022
paulson@3715
  2023
* Pure: fixed idt/idts vs. pttrn/pttrns syntactic categories;
paulson@3715
  2024
paulson@3715
  2025
paulson@3715
  2026
*** HOL ***
paulson@3715
  2027
wenzelm@5726
  2028
* HOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  2029
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
  2030
nipkow@4035
  2031
* HOL/TLA: Stephan Merz's formalization of Lamport's Temporal Logic of Actions;
wenzelm@3985
  2032
wenzelm@3985
  2033
* HOL/Auth: new protocol proofs including some for the Internet
nipkow@4035
  2034
  protocol TLS;
wenzelm@3985
  2035
wenzelm@4125
  2036
* HOL/Map: new theory of `maps' a la VDM;
nipkow@3982
  2037
wenzelm@4335
  2038
* HOL/simplifier: simplification procedures nat_cancel_sums for
wenzelm@4335
  2039
cancelling out common nat summands from =, <, <= (in)equalities, or
wenzelm@4335
  2040
differences; simplification procedures nat_cancel_factor for
wenzelm@4335
  2041
cancelling common factor from =, <, <= (in)equalities over natural
wenzelm@4373
  2042
sums; nat_cancel contains both kinds of procedures, it is installed by
wenzelm@4373
  2043
default in Arith.thy -- this COULD MAKE EXISTING PROOFS FAIL;
wenzelm@4335
  2044
nipkow@3580
  2045
* HOL/simplifier: terms of the form
paulson@4325
  2046
  `? x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x)'  (or t=x)
nipkow@3580
  2047
  are rewritten to
nipkow@4035
  2048
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t)',
nipkow@4035
  2049
  and those of the form
paulson@4325
  2050
  `! x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x) --> R(x)'  (or t=x)
nipkow@4035
  2051
  are rewritten to
nipkow@4035
  2052
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t) --> R(t)',
nipkow@4035
  2053
nipkow@4035
  2054
* HOL/datatype
nipkow@4035
  2055
  Each datatype `t' now comes with a theorem `split_t_case' of the form
nipkow@3580
  2056
nipkow@4035
  2057
  P(t_case f1 ... fn x) =
nipkow@4035
  2058
     ( (!y1 ... ym1. x = C1 y1 ... ym1 --> P(f1 y1 ... ym1)) &
nipkow@4035
  2059
        ...
oheimb@4189
  2060
       (!y1 ... ymn. x = Cn y1 ... ymn --> P(f1 y1 ... ymn))
nipkow@4035
  2061
     )
nipkow@4035
  2062
oheimb@4930
  2063
  and a theorem `split_t_case_asm' of the form
oheimb@4189
  2064
oheimb@4189
  2065
  P(t_case f1 ... fn x) =
oheimb@4189
  2066
    ~( (? y1 ... ym1. x = C1 y1 ... ym1 & ~P(f1 y1 ... ym1)) |
oheimb@4189
  2067
        ...
oheimb@4189
  2068
       (? y1 ... ymn. x = Cn y1 ... ymn & ~P(f1 y1 ... ymn))
oheimb@4189
  2069
     )
oheimb@4930
  2070
  which can be added to a simpset via `addsplits'. The existing theorems
oheimb@4930
  2071
  expand_list_case and expand_option_case have been renamed to
oheimb@4930
  2072
  split_list_case and split_option_case.
oheimb@4189
  2073
nipkow@4361
  2074
* HOL/Arithmetic:
nipkow@4361
  2075
  - `pred n' is automatically converted to `n-1'.
nipkow@4361
  2076
    Users are strongly encouraged not to use `pred' any longer,
nipkow@4361
  2077
    because it will disappear altogether at some point.
nipkow@4361
  2078
  - Users are strongly encouraged to write "0 < n" rather than
nipkow@4361
  2079
    "n ~= 0". Theorems and proof tools have been modified towards this
nipkow@4361
  2080
    `standard'.
nipkow@4357
  2081
nipkow@4502
  2082
* HOL/Lists:
nipkow@4502
  2083
  the function "set_of_list" has been renamed "set" (and its theorems too);
nipkow@4502
  2084
  the function "nth" now takes its arguments in the reverse order and
nipkow@4502
  2085
  has acquired the infix notation "!" as in "xs!n".
paulson@3570
  2086
paulson@4154
  2087
* HOL/Set: UNIV is now a constant and is no longer translated to Compl{};
paulson@4154
  2088
paulson@4154
  2089
* HOL/Set: The operator (UN x.B x) now abbreviates (UN x:UNIV. B x) and its
paulson@4154
  2090
  specialist theorems (like UN1_I) are gone.  Similarly for (INT x.B x);
paulson@4154
  2091
wenzelm@4575
  2092
* HOL/record: extensible records with schematic structural subtyping
wenzelm@4575
  2093
(single inheritance); EXPERIMENTAL version demonstrating the encoding,
wenzelm@4575
  2094
still lacks various theorems and concrete record syntax;
wenzelm@4575
  2095
wenzelm@4125
  2096
paulson@3715
  2097
*** HOLCF ***
wenzelm@3535
  2098
wenzelm@4125
  2099
* removed "axioms" and "generated by" sections;
wenzelm@4125
  2100
oheimb@4123
  2101
* replaced "ops" section by extended "consts" section, which is capable of
wenzelm@4125
  2102
  handling the continuous function space "->" directly;
wenzelm@4125
  2103
wenzelm@4125
  2104
* domain package:
wenzelm@4125
  2105
  . proves theorems immediately and stores them in the theory,
wenzelm@4125
  2106
  . creates hierachical name space,
wenzelm@4125
  2107
  . now uses normal mixfix annotations (instead of cinfix...),
wenzelm@4125
  2108
  . minor changes to some names and values (for consistency),
wenzelm@4125
  2109
  . e.g. cases -> casedist, dists_eq -> dist_eqs, [take_lemma] -> take_lemmas,
wenzelm@4125
  2110
  . separator between mutual domain defs: changed "," to "and",
wenzelm@4125
  2111
  . improved handling of sort constraints;  now they have to
wenzelm@4125
  2112
    appear on the left-hand side of the equations only;
oheimb@4123
  2113
oheimb@4123
  2114
* fixed LAM <x,y,zs>.b syntax;
wenzelm@3567
  2115
wenzelm@3744
  2116
* added extended adm_tac to simplifier in HOLCF -- can now discharge
wenzelm@3744
  2117
adm (%x. P (t x)), where P is chainfinite and t continuous;
wenzelm@3579
  2118
wenzelm@3579
  2119
paulson@3719
  2120
*** FOL and ZF ***
paulson@3719
  2121
wenzelm@5726
  2122
* FOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  2123
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
  2124
wenzelm@3744
  2125
* qed_spec_mp, qed_goal_spec_mp, qed_goalw_spec_mp are available, as
wenzelm@3744
  2126
in HOL, they strip ALL and --> from proved theorems;
wenzelm@3744
  2127
paulson@3719
  2128
wenzelm@3579
  2129
wenzelm@3006
  2130
New in Isabelle94-8 (May 1997)
wenzelm@3006
  2131
------------------------------
wenzelm@2654
  2132
paulson@3002
  2133
*** General Changes ***
paulson@3002
  2134
paulson@3002
  2135
* new utilities to build / run / maintain Isabelle etc. (in parts
paulson@3002
  2136
still somewhat experimental); old Makefiles etc. still functional;
wenzelm@2971
  2137
wenzelm@3205
  2138
* new 'Isabelle System Manual';
wenzelm@3205
  2139
wenzelm@2825
  2140
* INSTALL text, together with ./configure and ./build scripts;
wenzelm@2773
  2141
wenzelm@3006
  2142
* reimplemented type inference for greater efficiency, better error
wenzelm@3006
  2143
messages and clean internal interface;
paulson@3002
  2144
paulson@3002
  2145
* prlim command for dealing with lots of subgoals (an easier way of
paulson@3002
  2146
setting goals_limit);
paulson@3002
  2147
wenzelm@3006
  2148
wenzelm@3006
  2149
*** Syntax ***
paulson@3002
  2150
wenzelm@3116
  2151
* supports alternative (named) syntax tables (parser and pretty
wenzelm@3116
  2152
printer); internal interface is provided by add_modesyntax(_i);
wenzelm@3116
  2153
paulson@3002
  2154
* Pure, FOL, ZF, HOL, HOLCF now support symbolic input and output; to
paulson@3002
  2155
be used in conjunction with the Isabelle symbol font; uses the
paulson@3002
  2156
"symbols" syntax table;
paulson@3002
  2157
wenzelm@2705
  2158
* added token_translation interface (may translate name tokens in
wenzelm@2756
  2159
arbitrary ways, dependent on their type (free, bound, tfree, ...) and
wenzelm@3116
  2160
the current print_mode); IMPORTANT: user print translation functions
wenzelm@3116
  2161
are responsible for marking newly introduced bounds
wenzelm@3116
  2162
(Syntax.mark_boundT);
wenzelm@2705
  2163
wenzelm@2730
  2164
* token translations for modes "xterm" and "xterm_color" that display
wenzelm@3006
  2165
names in bold, underline etc. or colors (which requires a color
wenzelm@3006
  2166
version of xterm);
wenzelm@2730
  2167
paulson@3002
  2168
* infixes may now be declared with names independent of their syntax;
paulson@3002
  2169
paulson@3002
  2170
* added typed_print_translation (like print_translation, but may
paulson@3002
  2171
access type of constant);
paulson@3002
  2172
wenzelm@3006
  2173
paulson@3002
  2174
*** Classical Reasoner ***
paulson@3002
  2175
paulson@3002
  2176
Blast_tac: a new tactic!  It is often more powerful than fast_tac, but has
paulson@3002
  2177
some limitations.  Blast_tac...
paulson@3002
  2178
  + ignores addss, addbefore, addafter; this restriction is intrinsic
paulson@3002
  2179
  + ignores elimination rules that don't have the correct format
wenzelm@5726
  2180
        (the conclusion MUST be a formula variable)
paulson@3002
  2181
  + ignores types, which can make HOL proofs fail
paulson@3002
  2182
  + rules must not require higher-order unification, e.g. apply_type in ZF
paulson@3002
  2183
    [message "Function Var's argument not a bound variable" relates to this]
paulson@3002
  2184
  + its proof strategy is more general but can actually be slower
paulson@3002
  2185
wenzelm@3107
  2186
* substitution with equality assumptions no longer permutes other
wenzelm@3107
  2187
assumptions;
paulson@3002
  2188
paulson@3002
  2189
* minor changes in semantics of addafter (now called addaltern); renamed
paulson@3002
  2190
setwrapper to setWrapper and compwrapper to compWrapper; added safe wrapper
wenzelm@3107
  2191
(and access functions for it);
paulson@3002
  2192
wenzelm@5726
  2193
* improved combination of classical reasoner and simplifier:
oheimb@3317
  2194
  + functions for handling clasimpsets
oheimb@3317
  2195
  + improvement of addss: now the simplifier is called _after_ the
oheimb@3317
  2196
    safe steps.
oheimb@3317
  2197
  + safe variant of addss called addSss: uses safe simplifications
wenzelm@5726
  2198
    _during_ the safe steps. It is more complete as it allows multiple
oheimb@3317
  2199
    instantiations of unknowns (e.g. with slow_tac).
wenzelm@3006
  2200
paulson@3002
  2201
*** Simplifier ***
paulson@3002
  2202
wenzelm@3006
  2203
* added interface for simplification procedures (functions that
wenzelm@3006
  2204
produce *proven* rewrite rules on the fly, depending on current
wenzelm@3006
  2205
redex);
wenzelm@3006
  2206
wenzelm@3006
  2207
* ordering on terms as parameter (used for ordered rewriting);
wenzelm@3006
  2208
wenzelm@3107
  2209
* new functions delcongs, deleqcongs, and Delcongs. richer rep_ss;
paulson@3002
  2210
paulson@3002
  2211
* the solver is now split into a safe and an unsafe part.
paulson@3002
  2212
This should be invisible for the normal user, except that the
paulson@3002
  2213
functions setsolver and addsolver have been renamed to setSolver and
wenzelm@3107
  2214
addSolver; added safe_asm_full_simp_tac;
paulson@3002
  2215
paulson@3002
  2216
paulson@3002
  2217
*** HOL ***
paulson@3002
  2218
nipkow@3042
  2219
* a generic induction tactic `induct_tac' which works for all datatypes and
wenzelm@3107
  2220
also for type `nat';
nipkow@3042
  2221
nipkow@3316
  2222
* a generic case distinction tactic `exhaust_tac' which works for all
nipkow@3316
  2223
datatypes and also for type `nat';
nipkow@3316
  2224
nipkow@3316
  2225
* each datatype comes with a function `size';
nipkow@3316
  2226
paulson@3002
  2227
* patterns in case expressions allow tuple patterns as arguments to
wenzelm@3107
  2228
constructors, for example `case x of [] => ... | (x,y,z)#ps => ...';
paulson@3002
  2229
paulson@3002
  2230
* primrec now also works with type nat;
paulson@3002
  2231
paulson@3338
  2232
* recdef: a new declaration form, allows general recursive functions to be
paulson@3338
  2233
defined in theory files.  See HOL/ex/Fib, HOL/ex/Primes, HOL/Subst/Unify.
paulson@3338
  2234
paulson@3002
  2235
* the constant for negation has been renamed from "not" to "Not" to
wenzelm@3107
  2236
harmonize with FOL, ZF, LK, etc.;
paulson@3002
  2237
wenzelm@3107
  2238
* HOL/ex/LFilter theory of a corecursive "filter" functional for
wenzelm@3107
  2239
infinite lists;
paulson@3002
  2240
wenzelm@3227
  2241
* HOL/Modelcheck demonstrates invocation of model checker oracle;
wenzelm@3227
  2242
paulson@3002
  2243
* HOL/ex/Ring.thy declares cring_simp, which solves equational
paulson@3002
  2244
problems in commutative rings, using axiomatic type classes for + and *;
paulson@3002
  2245
paulson@3002
  2246
* more examples in HOL/MiniML and HOL/Auth;
paulson@3002
  2247
paulson@3002
  2248
* more default rewrite rules for quantifiers, union/intersection;
paulson@3002
  2249
nipkow@3321
  2250
* a new constant `arbitrary == @x.False';
nipkow@3321
  2251
wenzelm@3107
  2252
* HOLCF/IOA replaces old HOL/IOA;
wenzelm@3107
  2253
wenzelm@5726
  2254
* HOLCF changes: derived all rules and arities
wenzelm@5726
  2255
  + axiomatic type classes instead of classes
slotosch@2653
  2256
  + typedef instead of faking type definitions
paulson@2747
  2257
  + eliminated the internal constants less_fun, less_cfun, UU_fun, UU_cfun etc.
wenzelm@2730
  2258
  + new axclasses cpo, chfin, flat with flat < chfin < pcpo < cpo < po
slotosch@2653
  2259
  + eliminated the types void, one, tr
slotosch@2653
  2260
  + use unit lift and bool lift (with translations) instead of one and tr
slotosch@2653
  2261
  + eliminated blift from Lift3.thy (use Def instead of blift)
wenzelm@3107
  2262
  all eliminated rules are derived as theorems --> no visible changes ;
oheimb@2649
  2263
wenzelm@3006
  2264
paulson@3002
  2265
*** ZF ***
wenzelm@2553
  2266
paulson@2865
  2267
* ZF now has Fast_tac, Simp_tac and Auto_tac.  Union_iff is a now a default
paulson@2865
  2268
rewrite rule; this may affect some proofs.  eq_cs is gone but can be put back
paulson@2865
  2269
as ZF_cs addSIs [equalityI];
wenzelm@2553
  2270
wenzelm@2554
  2271
wenzelm@2732
  2272
wenzelm@2553
  2273
New in Isabelle94-7 (November 96)
wenzelm@2553
  2274
---------------------------------
wenzelm@2553
  2275
wenzelm@2553
  2276
* allowing negative levels (as offsets) in prlev and choplev;
wenzelm@2553
  2277
wenzelm@2554
  2278
* super-linear speedup for large simplifications;
wenzelm@2554
  2279
wenzelm@2554
  2280
* FOL, ZF and HOL now use miniscoping: rewriting pushes
wenzelm@2554
  2281
quantifications in as far as possible (COULD MAKE EXISTING PROOFS
wenzelm@2554
  2282
FAIL); can suppress it using the command Delsimps (ex_simps @
wenzelm@2554
  2283
all_simps); De Morgan laws are also now included, by default;
wenzelm@2554
  2284
wenzelm@2554
  2285
* improved printing of ==>  :  ~:
wenzelm@2554
  2286
wenzelm@2554
  2287
* new object-logic "Sequents" adds linear logic, while replacing LK
wenzelm@2554
  2288
and Modal (thanks to Sara Kalvala);
wenzelm@2554
  2289
wenzelm@2554
  2290
* HOL/Auth: correctness proofs for authentication protocols;
wenzelm@2554
  2291
wenzelm@2554
  2292
* HOL: new auto_tac combines rewriting and classical reasoning (many
wenzelm@2554
  2293
examples on HOL/Auth);
wenzelm@2554
  2294
wenzelm@2554
  2295
* HOL: new command AddIffs for declaring theorems of the form P=Q to
wenzelm@2554
  2296
the rewriter and classical reasoner simultaneously;
wenzelm@2554
  2297
wenzelm@2554
  2298
* function uresult no longer returns theorems in "standard" format;
wenzelm@2554
  2299
regain previous version by: val uresult = standard o uresult;
wenzelm@2554
  2300
wenzelm@2554
  2301
wenzelm@2554
  2302
wenzelm@2554
  2303
New in Isabelle94-6
wenzelm@2554
  2304
-------------------
wenzelm@2554
  2305
wenzelm@2554
  2306
* oracles -- these establish an interface between Isabelle and trusted
wenzelm@2554
  2307
external reasoners, which may deliver results as theorems;
wenzelm@2554
  2308
wenzelm@2554
  2309
* proof objects (in particular record all uses of oracles);
wenzelm@2554
  2310
wenzelm@2554
  2311
* Simp_tac, Fast_tac, etc. that refer to implicit simpset / claset;
wenzelm@2554
  2312
wenzelm@2554
  2313
* "constdefs" section in theory files;
wenzelm@2554
  2314
wenzelm@2554
  2315
* "primrec" section (HOL) no longer requires names;
wenzelm@2554
  2316
wenzelm@2554
  2317
* internal type "tactic" now simply "thm -> thm Sequence.seq";
wenzelm@2554
  2318
wenzelm@2554
  2319
wenzelm@2554
  2320
wenzelm@2554
  2321
New in Isabelle94-5
wenzelm@2554
  2322
-------------------
wenzelm@2554
  2323
wenzelm@2554
  2324
* reduced space requirements;
wenzelm@2554
  2325
wenzelm@2554
  2326
* automatic HTML generation from theories;
wenzelm@2554
  2327
wenzelm@2554
  2328
* theory files no longer require "..." (quotes) around most types;
wenzelm@2554
  2329
wenzelm@2554
  2330
* new examples, including two proofs of the Church-Rosser theorem;
wenzelm@2554
  2331
wenzelm@2554
  2332
* non-curried (1994) version of HOL is no longer distributed;
wenzelm@2554
  2333
wenzelm@2553
  2334
paulson@2557
  2335
paulson@2557
  2336
New in Isabelle94-4
paulson@2557
  2337
-------------------
paulson@2557
  2338
paulson@2747
  2339
* greatly reduced space requirements;
paulson@2557
  2340
paulson@2557
  2341
* theory files (.thy) no longer require \...\ escapes at line breaks;
paulson@2557
  2342
wenzelm@5726
  2343
* searchable theorem database (see the section "Retrieving theorems" on
paulson@2557
  2344
page 8 of the Reference Manual);
paulson@2557
  2345
paulson@2557
  2346
* new examples, including Grabczewski's monumental case study of the
paulson@2557
  2347
Axiom of Choice;
paulson@2557
  2348
paulson@2557
  2349
* The previous version of HOL renamed to Old_HOL;
paulson@2557
  2350
wenzelm@5726
  2351
* The new version of HOL (previously called CHOL) uses a curried syntax
paulson@2557
  2352
for functions.  Application looks like f a b instead of f(a,b);
paulson@2557
  2353
paulson@2557
  2354
* Mutually recursive inductive definitions finally work in HOL;
paulson@2557
  2355
paulson@2557
  2356
* In ZF, pattern-matching on tuples is now available in all abstractions and
paulson@2557
  2357
translates to the operator "split";
paulson@2557
  2358
paulson@2557
  2359
paulson@2557
  2360
paulson@2557
  2361
New in Isabelle94-3
paulson@2557
  2362
-------------------
paulson@2557
  2363
wenzelm@5726
  2364
* new infix operator, addss, allowing the classical reasoner to
paulson@2557
  2365
perform simplification at each step of its search.  Example:
wenzelm@5726
  2366
        fast_tac (cs addss ss)
paulson@2557
  2367
wenzelm@5726
  2368
* a new logic, CHOL, the same as HOL, but with a curried syntax
wenzelm@5726
  2369
for functions.  Application looks like f a b instead of f(a,b).  Also pairs
paulson@2557
  2370
look like (a,b) instead of <a,b>;
paulson@2557
  2371
paulson@2557
  2372
* PLEASE NOTE: CHOL will eventually replace HOL!
paulson@2557
  2373
paulson@2557
  2374
* In CHOL, pattern-matching on tuples is now available in all abstractions.
paulson@2557
  2375
It translates to the operator "split".  A new theory of integers is available;
paulson@2557
  2376
paulson@2557
  2377
* In ZF, integer numerals now denote two's-complement binary integers.
paulson@2557
  2378
Arithmetic operations can be performed by rewriting.  See ZF/ex/Bin.ML;
paulson@2557
  2379
wenzelm@5726
  2380
* Many new examples: I/O automata, Church-Rosser theorem, equivalents
paulson@2557
  2381
of the Axiom of Choice;
paulson@2557
  2382
paulson@2557
  2383
paulson@2557
  2384
paulson@2557
  2385
New in Isabelle94-2
paulson@2557
  2386
-------------------
paulson@2557
  2387
wenzelm@5726
  2388
* Significantly faster resolution;
paulson@2557
  2389
paulson@2557
  2390
* the different sections in a .thy file can now be mixed and repeated
paulson@2557
  2391
freely;
paulson@2557
  2392
paulson@2557
  2393
* Database of theorems for FOL, HOL and ZF.  New
paulson@2557
  2394
commands including qed, qed_goal and bind_thm store theorems in the database.
paulson@2557
  2395
paulson@2557
  2396
* Simple database queries: return a named theorem (get_thm) or all theorems of
paulson@2557
  2397
a given theory (thms_of), or find out what theory a theorem was proved in
paulson@2557
  2398
(theory_of_thm);
paulson@2557
  2399
paulson@2557
  2400
* Bugs fixed in the inductive definition and datatype packages;
paulson@2557
  2401
paulson@2557
  2402
* The classical reasoner provides deepen_tac and depth_tac, making FOL_dup_cs
paulson@2557
  2403
and HOL_dup_cs obsolete;
paulson@2557
  2404
paulson@2557
  2405
* Syntactic ambiguities caused by the new treatment of syntax in Isabelle94-1
paulson@2557
  2406
have been removed;
paulson@2557
  2407
paulson@2557
  2408
* Simpler definition of function space in ZF;
paulson@2557
  2409
paulson@2557
  2410
* new results about cardinal and ordinal arithmetic in ZF;
paulson@2557
  2411
paulson@2557
  2412
* 'subtype' facility in HOL for introducing new types as subsets of existing
paulson@2557
  2413
types;
paulson@2557
  2414
paulson@2557
  2415
wenzelm@2553
  2416
$Id$