NEWS
author gagern
Wed Apr 20 14:18:33 2005 +0200 (2005-04-20)
changeset 15778 98af3693f6b3
parent 15776 e2f45df0696f
child 15801 d2f5ca3c048d
permissions -rw-r--r--
Allow symlinks to shell scripts
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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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* ML: The type Library.option is no more, along with the exception
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  Library.OPTION: Isabelle now uses the standard option type.  The
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  functions the, is_some, is_none, etc. are still in Library, but
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  the constructors are now SOME and NONE instead of Some and None.
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  They raise the exception Option.
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* ML: The exception LIST is no more, the standard exceptions Empty and
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  Subscript, as well as Library.UnequalLengths are used instead.  This
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  means that function like Library.hd and Library.tl are gone, as the
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  standard hd and tl functions suffice.
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  A number of basic functions are now no longer exported to the top ML
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  level, as they are variants of standard functions.  The following
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  suggests how one can translate existing code:
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    the x = valOf x
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    if_none x y = getOpt(x,y)
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    is_some x = isSome x
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    apsome f x = Option.map f x
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    rev_append xs ys = List.revAppend(xs,ys)
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    nth_elem(i,xs) = List.nth(xs,i)
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    last_elem xs = List.last xs
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    flat xss = List.concat xss
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    seq fs = app fs
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    partition P xs = List.partition P xs
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    filter P xs = List.filter P xs
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    mapfilter f xs = List.mapPartial f xs
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  The final four functions, take, drop, foldl, and foldr, are somewhat
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  more complicated (especially the semantics of take and drop differ
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  from the standard).
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  A simple solution to broken code is to include "open Library" at the
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  beginning of a structure.  Everything after that will be as before.
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* Theory headers: the new header syntax for Isar theories is
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  theory <name>
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  imports <theory1> ... <theoryn>
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  begin
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  optionally also with a "files" section. The syntax
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  theory <name> = <theory1> + ... + <theoryn>:
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  will still be supported for some time but will eventually disappear.
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  The syntax of old-style theories has not changed.
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* Theory loader: parent theories can now also be referred to via
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  relative and absolute paths.
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* Provers/quasi.ML:  new transitivity reasoners for transitivity only
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  and quasi orders.
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* Provers/trancl.ML:  new transitivity reasoner for transitive and
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  reflexive-transitive closure of relations.
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* Provers/blast.ML:  new reference depth_limit to make blast's depth
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  limit (previously hard-coded with a value of 20) user-definable.
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* Provers: new version of the subst method, for single-step rewriting: it now
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  works in bound variable contexts. New is subst (asm), for rewriting an
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  assumption. Thanks to Lucas Dixon! INCOMPATIBILITY: may rewrite a different
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  subterm than the original subst method, which is still available under the
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  name simplesubst.
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* Pure: thin_tac now works even if the assumption being deleted contains !! or ==>. 
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  More generally, erule now works even if the major premise of the elimination rule
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  contains !! or ==>.
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* Pure: considerably improved version of 'constdefs' command.  Now
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  performs automatic type-inference of declared constants; additional
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  support for local structure declarations (cf. locales and HOL
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  records), see also isar-ref manual.  Potential INCOMPATIBILITY: need
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  to observe strictly sequential dependencies of definitions within a
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  single 'constdefs' section; moreover, the declared name needs to be
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  an identifier.  If all fails, consider to fall back on 'consts' and
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  'defs' separately.
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* Pure: improved indexed syntax and implicit structures.  First of
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  all, indexed syntax provides a notational device for subscripted
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  application, using the new syntax \<^bsub>term\<^esub> for arbitrary
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  expressions.  Secondly, in a local context with structure
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  declarations, number indexes \<^sub>n or the empty index (default
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  number 1) refer to a certain fixed variable implicitly; option
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  show_structs controls printing of implicit structures.  Typical
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  applications of these concepts involve record types and locales.
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* Pure: clear separation of logical types and nonterminals, where the
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  latter may only occur in 'syntax' specifications or type
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  abbreviations.  Before that distinction was only partially
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  implemented via type class "logic" vs. "{}".  Potential
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  INCOMPATIBILITY in rare cases of improper use of 'types'/'consts'
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  instead of 'nonterminals'/'syntax'.  Some very exotic syntax
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  specifications may require further adaption (e.g. Cube/Base.thy).
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* Pure: removed obsolete type class "logic", use the top sort {}
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  instead.  Note that non-logical types should be declared as
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  'nonterminals' rather than 'types'.  INCOMPATIBILITY for new
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  object-logic specifications.
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* Pure: command 'no_syntax' removes grammar declarations (and
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  translations) resulting from the given syntax specification, which
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  is interpreted in the same manner as for the 'syntax' command.
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* Pure: print_tac now outputs the goal through the trace channel.
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* Pure: reference Namespace.unique_names included.  If true the
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  (shortest) namespace-prefix is printed to disambiguate conflicts (as
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  yet). If false the first entry wins (as during parsing). Default
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  value is true.
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* Pure: tuned internal renaming of symbolic identifiers -- attach
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  primes instead of base 26 numbers.
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* Pure: new flag show_var_qmarks to control printing of leading
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  question marks of variable names.
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* Pure/Syntax: inner syntax includes (*(*nested*) comments*).
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* Pure/Syntax: pretty pinter now supports unbreakable blocks,
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  specified in mixfix annotations as "(00...)".
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* Pure/Syntax: 'advanced' translation functions (parse_translation
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  etc.) may depend on the signature of the theory context being
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  presently used for parsing/printing, see also isar-ref manual.
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* Pure/Simplifier: simplification procedures may now take the current
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  simpset into account (cf. Simplifier.simproc(_i) / mk_simproc
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  interface), which is very useful for calling the Simplifier
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  recursively.  Minor INCOMPATIBILITY: the 'prems' argument of
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  simprocs is gone -- use prems_of_ss on the simpset instead.
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  Moreover, the low-level mk_simproc no longer applies Logic.varify
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  internally, to allow for use in a context of fixed variables.
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* Pure/Simplifier: Command "find_rewrites" takes a string and lists all
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  equality theorems (not just those declared as simp!) whose left-hand
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  side matches the term given via the string. In PG the command can be
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  activated via Isabelle -> Show me -> matching rewrites.
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* Isar debugging: new reference Toplevel.debug; default false.
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  Set to make printing of exceptions THM, TERM, TYPE and THEORY more verbose.
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* Locales:
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  - "includes" disallowed in declaration of named locales (command "locale").
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  - Fixed parameter management in theorem generation for goals with "includes".
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    INCOMPATIBILITY: rarely, the generated theorem statement is different.
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* Locales:  new commands for the interpretation of locale expressions
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  in theories (interpretation) and proof contexts (interpret).  These take an
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  instantiation of the locale parameters and compute proof obligations from
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  the instantiated specification.  After the obligations have been discharged,
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  the instantiated theorems of the locale are added to the theory or proof
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  context.  Interpretation is smart in that already active interpretations
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  do not occur in proof obligations, neither are instantiated theorems stored
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  in duplicate.
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  Use print_interps to inspect active interpretations of a particular locale.
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  For details, see the Isar Reference manual.
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* Locales: proper static binding of attribute syntax -- i.e. types /
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  terms / facts mentioned as arguments are always those of the locale
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  definition context, independently of the context of later
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  invocations.  Moreover, locale operations (renaming and type / term
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  instantiation) are applied to attribute arguments as expected.
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  INCOMPATIBILITY of the ML interface: always pass Attrib.src instead
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  of actual attributes; rare situations may require Attrib.attribute
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  to embed those attributes into Attrib.src that lack concrete syntax.
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  Attribute implementations need to cooperate properly with the static
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  binding mechanism.  Basic parsers Args.XXX_typ/term/prop and
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  Attrib.XXX_thm etc. already do the right thing without further
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  intervention.  Only unusual applications -- such as "where" or "of"
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  (cf. src/Pure/Isar/attrib.ML), which process arguments depending
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  both on the context and the facts involved -- may have to assign
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  parsed values to argument tokens explicitly.
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* Attributes 'induct' and 'cases': type or set names may now be
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  locally fixed variables as well.
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* Isar: new syntax 'name(i-j, i-, i, ...)' for referring to specific
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  selections of theorems in named facts via indices.
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*** Document preparation ***
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* New antiquotations @{lhs thm} and @{rhs thm} printing the lhs/rhs of
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  definitions, equations, inequations etc.
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* Antiquotations now provide the option 'locale=NAME' to specify an
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  alternative context used for evaluating and printing the subsequent
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  argument, as in @{thm [locale=LC] fold_commute}, for example.
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* Commands 'display_drafts' and 'print_drafts' perform simple output
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  of raw sources.  Only those symbols that do not require additional
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  LaTeX packages (depending on comments in isabellesym.sty) are
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  displayed properly, everything else is left verbatim.  We use
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  isatool display and isatool print as front ends; these are subject
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  to the DVI/PDF_VIEWER and PRINT_COMMAND settings, respectively.
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* Proof scripts as well as some other commands such as ML or
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  parse/print_translation can now be hidden in the document.  Hiding
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  is enabled by default, and can be disabled either via the option '-H
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  false' of isatool usedir or by resetting the reference variable
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  IsarOutput.hide_commands. Additional commands to be hidden may be
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  declared using IsarOutput.add_hidden_commands.
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*** HOL ***
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* Datatype induction via method `induct' now preserves the name of the
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  induction variable. For example, when proving P(xs::'a list) by induction
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  on xs, the induction step is now P(xs) ==> P(a#xs) rather than
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  P(list) ==> P(a#list) as previously.
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* HOL/record: reimplementation of records. Improved scalability for
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  records with many fields, avoiding performance problems for type
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  inference. Records are no longer composed of nested field types, but
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  of nested extension types. Therefore the record type only grows
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  linear in the number of extensions and not in the number of fields.
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  The top-level (users) view on records is preserved.  Potential
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  INCOMPATIBILITY only in strange cases, where the theory depends on
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  the old record representation. The type generated for a record is
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  called <record_name>_ext_type.
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* HOL/record: Reference record_quick_and_dirty_sensitive can be
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  enabled to skip the proofs triggered by a record definition or a
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  simproc (if quick_and_dirty is enabled). Definitions of large
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  records can take quite long.
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* HOL/record: "record_upd_simproc" for simplification of multiple
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  record updates enabled by default.  Moreover, trivial updates are
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  also removed: r(|x := x r|) = r.  INCOMPATIBILITY: old proofs break
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  occasionally, since simplification is more powerful by default.
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* HOL: symbolic syntax of Hilbert Choice Operator is now as follows:
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  syntax (epsilon)
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    "_Eps" :: "[pttrn, bool] => 'a"    ("(3\<some>_./ _)" [0, 10] 10)
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  The symbol \<some> is displayed as the alternative epsilon of LaTeX
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  and x-symbol; use option '-m epsilon' to get it actually printed.
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  Moreover, the mathematically important symbolic identifier
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  \<epsilon> becomes available as variable, constant etc.
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* HOL: "x > y" abbreviates "y < x" and "x >= y" abbreviates "y <= x".
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  Similarly for all quantifiers: "ALL x > y" etc.
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  The x-symbol for >= is \<ge>.
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* HOL/Set: "{x:A. P}" abbreviates "{x. x:A & P}"
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           (and similarly for "\<in>" instead of ":")
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* HOL/SetInterval: The syntax for open intervals has changed:
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  Old         New
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  {..n(}   -> {..<n}
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  {)n..}   -> {n<..}
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  {m..n(}  -> {m..<n}
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  {)m..n}  -> {m<..n}
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  {)m..n(} -> {m<..<n}
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  The old syntax is still supported but will disappear in the future.
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  For conversion use the following emacs search and replace patterns:
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  {)\([^\.]*\)\.\.  ->  {\1<\.\.}
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  \.\.\([^(}]*\)(}  ->  \.\.<\1}
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  They are not perfect but work quite well.
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* HOL: The syntax for 'setsum', summation over finite sets, has changed:
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  The syntax for 'setsum (%x. e) A' used to be '\<Sum>x:A. e'
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  and is now either 'SUM x:A. e' or '\<Sum>x\<in>A. e'.
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  There is new syntax for summation over finite sets:
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  '\<Sum>x | P. e'    is the same as  'setsum (%x. e) {x. P}'
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  '\<Sum>x=a..b. e'   is the same as  'setsum (%x. e) {a..b}'
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  '\<Sum>x=a..<b. e'  is the same as  'setsum (%x. e) {a..<b}'
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  '\<Sum>x<k. e'      is the same as  'setsum (%x. e) {..<k}'
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  Function 'Summation' over nat is gone, its syntax '\<Sum>i<k. e'
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  now translates into 'setsum' as above.
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* HOL: Finite set induction: In Isar proofs, the insert case is now
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  "case (insert x F)" instead of the old counterintuitive "case (insert F x)".
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* HOL/Simplifier:
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  - Is now set up to reason about transitivity chains involving "trancl"
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  (r^+) and "rtrancl" (r^*) by setting up tactics provided by
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  Provers/trancl.ML as additional solvers.  INCOMPATIBILITY: old proofs break
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  occasionally as simplification may now solve more goals than previously.
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  - Converts x <= y into x = y if assumption y <= x is present.  Works for
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  all partial orders (class "order"), in particular numbers and sets. For
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  linear orders (e.g. numbers) it treats ~ x < y just like y <= x.
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  - Simproc for "let x = a in f x"
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  If a is a free or bound variable or a constant then the let is unfolded.
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  Otherwise first a is simplified to a', and then f a' is simplified to
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  g. If possible we abstract a' from g arriving at "let x = a' in g' x",
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  otherwise we unfold the let and arrive at g. The simproc can be 
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  enabled/disabled by the reference use_let_simproc. Potential
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  INCOMPATIBILITY since simplification is more powerful by default.
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* HOL: The 'refute' command has been extended to support a much larger
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  fragment of HOL, including axiomatic type classes, constdefs and typedefs,
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  inductive datatypes and recursion.
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*** HOLCF ***
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* HOLCF: discontinued special version of 'constdefs' (which used to
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  support continuous functions) in favor of the general Pure one with
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  full type-inference.
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*** ZF ***
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* ZF/ex/{Group,Ring}: examples in abstract algebra, including the
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  First Isomorphism Theorem (on quotienting by the kernel of a
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  homomorphism).
wenzelm@15089
   332
wenzelm@15089
   333
* ZF/Simplifier: install second copy of type solver that actually
wenzelm@15089
   334
  makes use of TC rules declared to Isar proof contexts (or locales);
wenzelm@15089
   335
  the old version is still required for ML proof scripts.
paulson@14885
   336
paulson@14885
   337
wenzelm@15703
   338
*** System ***
wenzelm@15703
   339
wenzelm@15703
   340
* HOL: isatool dimacs2hol converts files in DIMACS CNF format
wenzelm@15703
   341
  (containing Boolean satisfiability problems) into Isabelle/HOL
wenzelm@15703
   342
  theories.
wenzelm@15703
   343
wenzelm@15703
   344
* isatool usedir: option -f allows specification of the ML file to be
wenzelm@15703
   345
  used by Isabelle; default is ROOT.ML.
wenzelm@15703
   346
gagern@15778
   347
* symlinks to Isabelle, isabelle, isabelle-interface and isabelle-process
gagern@15778
   348
  are allowed; isabelle directories are determined based on link target.
gagern@15778
   349
wenzelm@15703
   350
* ISABELLE_DOC_FORMAT setting specifies preferred document format (for
wenzelm@15703
   351
  isatool doc, isatool mkdir, display_drafts etc.).
wenzelm@15703
   352
wenzelm@15703
   353
wenzelm@15703
   354
*** ML ***
wenzelm@15703
   355
wenzelm@15703
   356
* Pure: output via the Isabelle channels of writeln/warning/error
wenzelm@15703
   357
  etc. is now passed through Output.output, with a hook for arbitrary
wenzelm@15703
   358
  transformations depending on the print_mode (cf. Output.add_mode --
wenzelm@15703
   359
  the first active mode that provides a output function wins).
wenzelm@15703
   360
  Already formatted output may be embedded into further text via
wenzelm@15703
   361
  Output.raw; the result of Pretty.string_of/str_of and derived
wenzelm@15703
   362
  functions (string_of_term/cterm/thm etc.) is already marked raw to
wenzelm@15703
   363
  accommodate easy composition of diagnostic messages etc.
wenzelm@15703
   364
  Programmers rarely need to care about Output.output or Output.raw at
wenzelm@15703
   365
  all, with some notable exceptions: Output.output is required when
wenzelm@15703
   366
  bypassing the standard channels (writeln etc.), or in token
wenzelm@15703
   367
  translations to produce properly formatted results; Output.raw is
wenzelm@15703
   368
  required when capturing already output material that will eventually
wenzelm@15703
   369
  be presented to the user a second time.  For the default print mode,
wenzelm@15703
   370
  both Output.output and Output.raw have no effect.
wenzelm@15703
   371
wenzelm@15703
   372
* Provers: Simplifier and Classical Reasoner now support proof context
wenzelm@15703
   373
  dependent plug-ins (simprocs, solvers, wrappers etc.).  These extra
wenzelm@15703
   374
  components are stored in the theory and patched into the
wenzelm@15703
   375
  simpset/claset when used in an Isar proof context.  Context
wenzelm@15703
   376
  dependent components are maintained by the following theory
wenzelm@15703
   377
  operations:
wenzelm@15703
   378
wenzelm@15703
   379
    Simplifier.add_context_simprocs
wenzelm@15703
   380
    Simplifier.del_context_simprocs
wenzelm@15703
   381
    Simplifier.set_context_subgoaler
wenzelm@15703
   382
    Simplifier.reset_context_subgoaler
wenzelm@15703
   383
    Simplifier.add_context_looper
wenzelm@15703
   384
    Simplifier.del_context_looper
wenzelm@15703
   385
    Simplifier.add_context_unsafe_solver
wenzelm@15703
   386
    Simplifier.add_context_safe_solver
wenzelm@15703
   387
wenzelm@15703
   388
    Classical.add_context_safe_wrapper
wenzelm@15703
   389
    Classical.del_context_safe_wrapper
wenzelm@15703
   390
    Classical.add_context_unsafe_wrapper
wenzelm@15703
   391
    Classical.del_context_unsafe_wrapper
wenzelm@15703
   392
wenzelm@15703
   393
  IMPORTANT NOTE: proof tools (methods etc.) need to use
wenzelm@15703
   394
  local_simpset_of and local_claset_of to instead of the primitive
wenzelm@15703
   395
  Simplifier.get_local_simpset and Classical.get_local_claset,
wenzelm@15703
   396
  respectively, in order to see the context dependent fields!
wenzelm@15703
   397
wenzelm@15703
   398
wenzelm@14655
   399
wenzelm@14606
   400
New in Isabelle2004 (April 2004)
wenzelm@14606
   401
--------------------------------
wenzelm@13280
   402
skalberg@14171
   403
*** General ***
skalberg@14171
   404
ballarin@14398
   405
* Provers/order.ML:  new efficient reasoner for partial and linear orders.
ballarin@14398
   406
  Replaces linorder.ML.
ballarin@14398
   407
wenzelm@14606
   408
* Pure: Greek letters (except small lambda, \<lambda>), as well as Gothic
wenzelm@14606
   409
  (\<aa>...\<zz>\<AA>...\<ZZ>), calligraphic (\<A>...\<Z>), and Euler
skalberg@14173
   410
  (\<a>...\<z>), are now considered normal letters, and can therefore
skalberg@14173
   411
  be used anywhere where an ASCII letter (a...zA...Z) has until
skalberg@14173
   412
  now. COMPATIBILITY: This obviously changes the parsing of some
skalberg@14173
   413
  terms, especially where a symbol has been used as a binder, say
skalberg@14173
   414
  '\<Pi>x. ...', which is now a type error since \<Pi>x will be parsed
skalberg@14173
   415
  as an identifier.  Fix it by inserting a space around former
skalberg@14173
   416
  symbols.  Call 'isatool fixgreek' to try to fix parsing errors in
skalberg@14173
   417
  existing theory and ML files.
skalberg@14171
   418
paulson@14237
   419
* Pure: Macintosh and Windows line-breaks are now allowed in theory files.
paulson@14237
   420
wenzelm@14731
   421
* Pure: single letter sub/superscripts (\<^isub> and \<^isup>) are now
wenzelm@14731
   422
  allowed in identifiers. Similar to Greek letters \<^isub> is now considered
wenzelm@14731
   423
  a normal (but invisible) letter. For multiple letter subscripts repeat
wenzelm@14731
   424
  \<^isub> like this: x\<^isub>1\<^isub>2.
kleing@14233
   425
kleing@14333
   426
* Pure: There are now sub-/superscripts that can span more than one
kleing@14333
   427
  character. Text between \<^bsub> and \<^esub> is set in subscript in
wenzelm@14606
   428
  ProofGeneral and LaTeX, text between \<^bsup> and \<^esup> in
wenzelm@14606
   429
  superscript. The new control characters are not identifier parts.
kleing@14333
   430
schirmer@14561
   431
* Pure: Control-symbols of the form \<^raw:...> will literally print the
wenzelm@14606
   432
  content of "..." to the latex file instead of \isacntrl... . The "..."
wenzelm@14606
   433
  may consist of any printable characters excluding the end bracket >.
schirmer@14361
   434
paulson@14237
   435
* Pure: Using new Isar command "finalconsts" (or the ML functions
paulson@14237
   436
  Theory.add_finals or Theory.add_finals_i) it is now possible to
paulson@14237
   437
  declare constants "final", which prevents their being given a definition
paulson@14237
   438
  later.  It is useful for constants whose behaviour is fixed axiomatically
skalberg@14224
   439
  rather than definitionally, such as the meta-logic connectives.
skalberg@14224
   440
wenzelm@14606
   441
* Pure: 'instance' now handles general arities with general sorts
wenzelm@14606
   442
  (i.e. intersections of classes),
skalberg@14503
   443
kleing@14547
   444
* Presentation: generated HTML now uses a CSS style sheet to make layout
wenzelm@14731
   445
  (somewhat) independent of content. It is copied from lib/html/isabelle.css.
kleing@14547
   446
  It can be changed to alter the colors/layout of generated pages.
kleing@14547
   447
wenzelm@14556
   448
ballarin@14175
   449
*** Isar ***
ballarin@14175
   450
ballarin@14508
   451
* Tactic emulation methods rule_tac, erule_tac, drule_tac, frule_tac,
ballarin@14508
   452
  cut_tac, subgoal_tac and thin_tac:
ballarin@14175
   453
  - Now understand static (Isar) contexts.  As a consequence, users of Isar
ballarin@14175
   454
    locales are no longer forced to write Isar proof scripts.
ballarin@14175
   455
    For details see Isar Reference Manual, paragraph 4.3.2: Further tactic
ballarin@14175
   456
    emulations.
ballarin@14175
   457
  - INCOMPATIBILITY: names of variables to be instantiated may no
ballarin@14211
   458
    longer be enclosed in quotes.  Instead, precede variable name with `?'.
ballarin@14211
   459
    This is consistent with the instantiation attribute "where".
ballarin@14211
   460
ballarin@14257
   461
* Attributes "where" and "of":
ballarin@14285
   462
  - Now take type variables of instantiated theorem into account when reading
ballarin@14285
   463
    the instantiation string.  This fixes a bug that caused instantiated
ballarin@14285
   464
    theorems to have too special types in some circumstances.
ballarin@14285
   465
  - "where" permits explicit instantiations of type variables.
ballarin@14257
   466
wenzelm@14556
   467
* Calculation commands "moreover" and "also" no longer interfere with
wenzelm@14556
   468
  current facts ("this"), admitting arbitrary combinations with "then"
wenzelm@14556
   469
  and derived forms.
kleing@14283
   470
ballarin@14211
   471
* Locales:
ballarin@14211
   472
  - Goal statements involving the context element "includes" no longer
ballarin@14211
   473
    generate theorems with internal delta predicates (those ending on
ballarin@14211
   474
    "_axioms") in the premise.
ballarin@14211
   475
    Resolve particular premise with <locale>.intro to obtain old form.
ballarin@14211
   476
  - Fixed bug in type inference ("unify_frozen") that prevented mix of target
ballarin@14211
   477
    specification and "includes" elements in goal statement.
ballarin@14254
   478
  - Rule sets <locale>.intro and <locale>.axioms no longer declared as
ballarin@14254
   479
    [intro?] and [elim?] (respectively) by default.
ballarin@14508
   480
  - Experimental command for instantiation of locales in proof contexts:
ballarin@14551
   481
        instantiate <label>[<attrs>]: <loc>
ballarin@14508
   482
    Instantiates locale <loc> and adds all its theorems to the current context
ballarin@14551
   483
    taking into account their attributes.  Label and attrs are optional
ballarin@14551
   484
    modifiers, like in theorem declarations.  If present, names of
ballarin@14551
   485
    instantiated theorems are qualified with <label>, and the attributes
ballarin@14551
   486
    <attrs> are applied after any attributes these theorems might have already.
ballarin@14551
   487
      If the locale has assumptions, a chained fact of the form
ballarin@14508
   488
    "<loc> t1 ... tn" is expected from which instantiations of the parameters
ballarin@14551
   489
    are derived.  The command does not support old-style locales declared
ballarin@14551
   490
    with "locale (open)".
ballarin@14551
   491
      A few (very simple) examples can be found in FOL/ex/LocaleInst.thy.
ballarin@14175
   492
ballarin@14175
   493
* HOL: Tactic emulation methods induct_tac and case_tac understand static
ballarin@14175
   494
  (Isar) contexts.
ballarin@14175
   495
wenzelm@14556
   496
kleing@14136
   497
*** HOL ***
kleing@14136
   498
kleing@14624
   499
* Proof import: new image HOL4 contains the imported library from
kleing@14624
   500
  the HOL4 system with about 2500 theorems. It is imported by
kleing@14624
   501
  replaying proof terms produced by HOL4 in Isabelle. The HOL4 image
kleing@14624
   502
  can be used like any other Isabelle image.  See
kleing@14624
   503
  HOL/Import/HOL/README for more information.
kleing@14624
   504
ballarin@14398
   505
* Simplifier:
ballarin@14398
   506
  - Much improved handling of linear and partial orders.
ballarin@14398
   507
    Reasoners for linear and partial orders are set up for type classes
ballarin@14398
   508
    "linorder" and "order" respectively, and are added to the default simpset
ballarin@14398
   509
    as solvers.  This means that the simplifier can build transitivity chains
ballarin@14398
   510
    to solve goals from the assumptions.
ballarin@14398
   511
  - INCOMPATIBILITY: old proofs break occasionally.  Typically, applications
ballarin@14398
   512
    of blast or auto after simplification become unnecessary because the goal
ballarin@14398
   513
    is solved by simplification already.
ballarin@14398
   514
wenzelm@14731
   515
* Numerics: new theory Ring_and_Field contains over 250 basic numerical laws,
paulson@14389
   516
    all proved in axiomatic type classes for semirings, rings and fields.
paulson@14389
   517
paulson@14389
   518
* Numerics:
paulson@14389
   519
  - Numeric types (nat, int, and in HOL-Complex rat, real, complex, etc.) are
wenzelm@14731
   520
    now formalized using the Ring_and_Field theory mentioned above.
paulson@14389
   521
  - INCOMPATIBILITY: simplification and arithmetic behaves somewhat differently
paulson@14389
   522
    than before, because now they are set up once in a generic manner.
wenzelm@14731
   523
  - INCOMPATIBILITY: many type-specific arithmetic laws have gone.
paulson@14480
   524
    Look for the general versions in Ring_and_Field (and Power if they concern
paulson@14480
   525
    exponentiation).
paulson@14389
   526
paulson@14401
   527
* Type "rat" of the rational numbers is now available in HOL-Complex.
paulson@14389
   528
schirmer@14255
   529
* Records:
schirmer@14255
   530
  - Record types are now by default printed with their type abbreviation
schirmer@14255
   531
    instead of the list of all field types. This can be configured via
schirmer@14255
   532
    the reference "print_record_type_abbr".
wenzelm@14731
   533
  - Simproc "record_upd_simproc" for simplification of multiple updates added
schirmer@14255
   534
    (not enabled by default).
schirmer@14427
   535
  - Simproc "record_ex_sel_eq_simproc" to simplify EX x. sel r = x resp.
schirmer@14427
   536
    EX x. x = sel r to True (not enabled by default).
schirmer@14255
   537
  - Tactic "record_split_simp_tac" to split and simplify records added.
wenzelm@14731
   538
kleing@14136
   539
* 'specification' command added, allowing for definition by
skalberg@14224
   540
  specification.  There is also an 'ax_specification' command that
skalberg@14224
   541
  introduces the new constants axiomatically.
kleing@14136
   542
nipkow@14375
   543
* arith(_tac) is now able to generate counterexamples for reals as well.
nipkow@14375
   544
ballarin@14399
   545
* HOL-Algebra: new locale "ring" for non-commutative rings.
ballarin@14399
   546
paulson@14243
   547
* HOL-ex: InductiveInvariant_examples illustrates advanced recursive function
kleing@14610
   548
  definitions, thanks to Sava Krsti\'{c} and John Matthews.
kleing@14610
   549
wenzelm@14731
   550
* HOL-Matrix: a first theory for matrices in HOL with an application of
kleing@14610
   551
  matrix theory to linear programming.
kleing@14136
   552
nipkow@14380
   553
* Unions and Intersections:
nipkow@15119
   554
  The latex output syntax of UN and INT has been changed
nipkow@15119
   555
  from "\Union x \in A. B" to "\Union_{x \in A} B"
nipkow@15119
   556
  i.e. the index formulae has become a subscript.
nipkow@15119
   557
  Similarly for "\Union x. B", and for \Inter instead of \Union.
nipkow@14380
   558
kleing@14418
   559
* Unions and Intersections over Intervals:
wenzelm@14731
   560
  There is new short syntax "UN i<=n. A" for "UN i:{0..n}. A". There is
wenzelm@14731
   561
  also an x-symbol version with subscripts "\<Union>\<^bsub>i <= n\<^esub>. A"
kleing@14418
   562
  like in normal math, and corresponding versions for < and for intersection.
kleing@14418
   563
nipkow@15677
   564
* HOL/List: Ordering "lexico" is renamed "lenlex" and the standard
nipkow@15677
   565
  lexicographic dictonary ordering has been added as "lexord".
nipkow@15677
   566
paulson@14401
   567
* ML: the legacy theory structures Int and List have been removed. They had
paulson@14401
   568
  conflicted with ML Basis Library structures having the same names.
nipkow@14380
   569
webertj@14464
   570
* 'refute' command added to search for (finite) countermodels.  Only works
webertj@14464
   571
  for a fragment of HOL.  The installation of an external SAT solver is
webertj@14464
   572
  highly recommended.  See "HOL/Refute.thy" for details.
webertj@14464
   573
berghofe@14602
   574
* 'quickcheck' command: Allows to find counterexamples by evaluating
berghofe@14602
   575
  formulae under an assignment of free variables to random values.
berghofe@14602
   576
  In contrast to 'refute', it can deal with inductive datatypes,
berghofe@14602
   577
  but cannot handle quantifiers. See "HOL/ex/Quickcheck_Examples.thy"
berghofe@14602
   578
  for examples.
webertj@14464
   579
wenzelm@14606
   580
oheimb@14536
   581
*** HOLCF ***
oheimb@14536
   582
oheimb@14536
   583
* Streams now come with concatenation and are part of the HOLCF image
oheimb@14536
   584
wenzelm@14572
   585
wenzelm@14572
   586
kleing@14136
   587
New in Isabelle2003 (May 2003)
wenzelm@14606
   588
------------------------------
kleing@14136
   589
wenzelm@13280
   590
*** General ***
wenzelm@13280
   591
berghofe@13618
   592
* Provers/simplifier:
berghofe@13618
   593
nipkow@13781
   594
  - Completely reimplemented method simp (ML: Asm_full_simp_tac):
berghofe@13618
   595
    Assumptions are now subject to complete mutual simplification,
berghofe@13618
   596
    not just from left to right. The simplifier now preserves
berghofe@13618
   597
    the order of assumptions.
berghofe@13618
   598
berghofe@13618
   599
    Potential INCOMPATIBILITY:
berghofe@13618
   600
nipkow@13781
   601
    -- simp sometimes diverges where the old version did
nipkow@13781
   602
       not, e.g. invoking simp on the goal
berghofe@13618
   603
berghofe@13618
   604
        [| P (f x); y = x; f x = f y |] ==> Q
berghofe@13618
   605
nipkow@13781
   606
       now gives rise to the infinite reduction sequence
nipkow@13781
   607
nipkow@13781
   608
        P(f x) --(f x = f y)--> P(f y) --(y = x)--> P(f x) --(f x = f y)--> ...
nipkow@13781
   609
nipkow@13781
   610
       Using "simp (asm_lr)" (ML: Asm_lr_simp_tac) instead often solves this
nipkow@13781
   611
       kind of problem.
nipkow@13781
   612
nipkow@13781
   613
    -- Tactics combining classical reasoner and simplification (such as auto)
nipkow@13781
   614
       are also affected by this change, because many of them rely on
nipkow@13781
   615
       simp. They may sometimes diverge as well or yield a different numbers
nipkow@13781
   616
       of subgoals. Try to use e.g. force, fastsimp, or safe instead of auto
nipkow@13781
   617
       in case of problems. Sometimes subsequent calls to the classical
nipkow@13781
   618
       reasoner will fail because a preceeding call to the simplifier too
nipkow@13781
   619
       eagerly simplified the goal, e.g. deleted redundant premises.
berghofe@13618
   620
berghofe@13618
   621
  - The simplifier trace now shows the names of the applied rewrite rules
berghofe@13618
   622
nipkow@13829
   623
  - You can limit the number of recursive invocations of the simplifier
nipkow@13829
   624
    during conditional rewriting (where the simplifie tries to solve the
nipkow@13829
   625
    conditions before applying the rewrite rule):
nipkow@13829
   626
    ML "simp_depth_limit := n"
nipkow@13829
   627
    where n is an integer. Thus you can force termination where previously
nipkow@13829
   628
    the simplifier would diverge.
nipkow@13829
   629
ballarin@13835
   630
  - Accepts free variables as head terms in congruence rules.  Useful in Isar.
nipkow@13829
   631
ballarin@13938
   632
  - No longer aborts on failed congruence proof.  Instead, the
ballarin@13938
   633
    congruence is ignored.
ballarin@13938
   634
berghofe@14008
   635
* Pure: New generic framework for extracting programs from constructive
berghofe@14008
   636
  proofs. See HOL/Extraction.thy for an example instantiation, as well
berghofe@14008
   637
  as HOL/Extraction for some case studies.
berghofe@14008
   638
nipkow@13868
   639
* Pure: The main goal of the proof state is no longer shown by default, only
nipkow@13868
   640
the subgoals. This behaviour is controlled by a new flag.
ballarin@13835
   641
   PG menu: Isabelle/Isar -> Settings -> Show Main Goal
nipkow@13815
   642
(ML: Proof.show_main_goal).
nipkow@13815
   643
nipkow@13815
   644
* Pure: You can find all matching introduction rules for subgoal 1, i.e. all
nipkow@13815
   645
rules whose conclusion matches subgoal 1:
nipkow@13815
   646
      PG menu: Isabelle/Isar -> Show me -> matching rules
nipkow@13815
   647
The rules are ordered by how closely they match the subgoal.
nipkow@13815
   648
In particular, rules that solve a subgoal outright are displayed first
nipkow@13815
   649
(or rather last, the way they are printed).
nipkow@13815
   650
(ML: ProofGeneral.print_intros())
nipkow@13815
   651
nipkow@13815
   652
* Pure: New flag trace_unify_fail causes unification to print
nipkow@13781
   653
diagnostic information (PG: in trace buffer) when it fails. This is
nipkow@13781
   654
useful for figuring out why single step proofs like rule, erule or
nipkow@13781
   655
assumption failed.
nipkow@13781
   656
nipkow@13815
   657
* Pure: Locale specifications now produce predicate definitions
wenzelm@13410
   658
according to the body of text (covering assumptions modulo local
wenzelm@13410
   659
definitions); predicate "loc_axioms" covers newly introduced text,
wenzelm@13410
   660
while "loc" is cumulative wrt. all included locale expressions; the
wenzelm@13410
   661
latter view is presented only on export into the global theory
wenzelm@13410
   662
context; potential INCOMPATIBILITY, use "(open)" option to fall back
wenzelm@13410
   663
on the old view without predicates;
wenzelm@13410
   664
wenzelm@13459
   665
* Pure: predefined locales "var" and "struct" are useful for sharing
wenzelm@13459
   666
parameters (as in CASL, for example); just specify something like
wenzelm@13459
   667
``var x + var y + struct M'' as import;
wenzelm@13459
   668
wenzelm@13463
   669
* Pure: improved thms_containing: proper indexing of facts instead of
wenzelm@13463
   670
raw theorems; check validity of results wrt. current name space;
wenzelm@13463
   671
include local facts of proof configuration (also covers active
wenzelm@13541
   672
locales), cover fixed variables in index; may use "_" in term
wenzelm@13541
   673
specification; an optional limit for the number of printed facts may
wenzelm@13541
   674
be given (the default is 40);
wenzelm@13541
   675
wenzelm@13541
   676
* Pure: disallow duplicate fact bindings within new-style theory files
wenzelm@13541
   677
(batch-mode only);
wenzelm@13540
   678
wenzelm@13463
   679
* Provers: improved induct method: assumptions introduced by case
wenzelm@13463
   680
"foo" are split into "foo.hyps" (from the rule) and "foo.prems" (from
wenzelm@13463
   681
the goal statement); "foo" still refers to all facts collectively;
wenzelm@13463
   682
paulson@13550
   683
* Provers: the function blast.overloaded has been removed: all constants
paulson@13550
   684
are regarded as potentially overloaded, which improves robustness in exchange
paulson@13550
   685
for slight decrease in efficiency;
paulson@13550
   686
nipkow@13781
   687
* Provers/linorder: New generic prover for transitivity reasoning over
nipkow@13781
   688
linear orders.  Note: this prover is not efficient!
nipkow@13781
   689
wenzelm@13522
   690
* Isar: preview of problems to finish 'show' now produce an error
wenzelm@13522
   691
rather than just a warning (in interactive mode);
wenzelm@13522
   692
wenzelm@13280
   693
nipkow@13158
   694
*** HOL ***
nipkow@13158
   695
nipkow@13899
   696
* arith(_tac)
nipkow@13899
   697
nipkow@13899
   698
 - Produces a counter example if it cannot prove a goal.
nipkow@13899
   699
   Note that the counter example may be spurious if the goal is not a formula
nipkow@13899
   700
   of quantifier-free linear arithmetic.
nipkow@13899
   701
   In ProofGeneral the counter example appears in the trace buffer.
nipkow@13899
   702
nipkow@13899
   703
 - Knows about div k and mod k where k is a numeral of type nat or int.
nipkow@13899
   704
nipkow@13899
   705
 - Calls full Presburger arithmetic (by Amine Chaieb) if quantifier-free
nipkow@13899
   706
   linear arithmetic fails. This takes account of quantifiers and divisibility.
wenzelm@14731
   707
   Presburger arithmetic can also be called explicitly via presburger(_tac).
nipkow@13899
   708
nipkow@13899
   709
* simp's arithmetic capabilities have been enhanced a bit: it now
nipkow@13899
   710
takes ~= in premises into account (by performing a case split);
nipkow@13899
   711
nipkow@13899
   712
* simp reduces "m*(n div m) + n mod m" to n, even if the two summands
nipkow@13899
   713
are distributed over a sum of terms;
nipkow@13899
   714
ballarin@13735
   715
* New tactic "trans_tac" and method "trans" instantiate
ballarin@13735
   716
Provers/linorder.ML for axclasses "order" and "linorder" (predicates
wenzelm@14731
   717
"<=", "<" and "=").
wenzelm@14731
   718
wenzelm@14731
   719
* function INCOMPATIBILITIES: Pi-sets have been redefined and moved from main
paulson@13587
   720
HOL to Library/FuncSet; constant "Fun.op o" is now called "Fun.comp";
paulson@13587
   721
wenzelm@13443
   722
* 'typedef' command has new option "open" to suppress the set
wenzelm@13443
   723
definition;
wenzelm@13443
   724
wenzelm@13522
   725
* functions Min and Max on finite sets have been introduced (theory
wenzelm@13522
   726
Finite_Set);
nipkow@13492
   727
wenzelm@13443
   728
* attribute [symmetric] now works for relations as well; it turns
wenzelm@13443
   729
(x,y) : R^-1 into (y,x) : R, and vice versa;
wenzelm@13443
   730
nipkow@13613
   731
* induct over a !!-quantified statement (say !!x1..xn):
nipkow@13613
   732
  each "case" automatically performs "fix x1 .. xn" with exactly those names.
nipkow@13613
   733
nipkow@13899
   734
* Map: `empty' is no longer a constant but a syntactic abbreviation for
nipkow@13899
   735
%x. None. Warning: empty_def now refers to the previously hidden definition
nipkow@13899
   736
of the empty set.
nipkow@13899
   737
ballarin@14018
   738
* Algebra: formalization of classical algebra.  Intended as base for
ballarin@14018
   739
any algebraic development in Isabelle.  Currently covers group theory
ballarin@14018
   740
(up to Sylow's theorem) and ring theory (Universal Property of
ballarin@14018
   741
Univariate Polynomials).  Contributions welcome;
paulson@13960
   742
paulson@13960
   743
* GroupTheory: deleted, since its material has been moved to Algebra;
paulson@13960
   744
wenzelm@14731
   745
* Complex: new directory of the complex numbers with numeric constants,
wenzelm@14731
   746
nonstandard complex numbers, and some complex analysis, standard and
paulson@13966
   747
nonstandard (Jacques Fleuriot);
paulson@13966
   748
paulson@13966
   749
* HOL-Complex: new image for analysis, replacing HOL-Real and HOL-Hyperreal;
paulson@13966
   750
wenzelm@14731
   751
* Hyperreal: introduced Gauge integration and hyperreal logarithms (Jacques
paulson@13966
   752
Fleuriot);
paulson@13960
   753
wenzelm@13549
   754
* Real/HahnBanach: updated and adapted to locales;
wenzelm@13549
   755
ballarin@13995
   756
* NumberTheory: added Gauss's law of quadratic reciprocity (by Avigad,
ballarin@13995
   757
Gray and Kramer);
paulson@13872
   758
paulson@13872
   759
* UNITY: added the Meier-Sanders theory of progress sets;
paulson@13872
   760
kleing@14011
   761
* MicroJava: bytecode verifier and lightweight bytecode verifier
kleing@14011
   762
as abstract algorithms, instantiated to the JVM;
kleing@14011
   763
schirmer@14010
   764
* Bali: Java source language formalization. Type system, operational
schirmer@14010
   765
semantics, axiomatic semantics. Supported language features:
schirmer@14010
   766
classes, interfaces, objects,virtual methods, static methods,
schirmer@14010
   767
static/instance fields, arrays, access modifiers, definite
schirmer@14010
   768
assignment, exceptions.
wenzelm@13549
   769
kleing@14011
   770
wenzelm@13549
   771
*** ZF ***
wenzelm@13549
   772
webertj@15154
   773
* ZF/Constructible: consistency proof for AC (Gdel's constructible
wenzelm@13549
   774
universe, etc.);
wenzelm@13549
   775
paulson@13872
   776
* Main ZF: virtually all theories converted to new-style format;
nipkow@13518
   777
wenzelm@13280
   778
wenzelm@13478
   779
*** ML ***
wenzelm@13478
   780
wenzelm@13478
   781
* Pure: Tactic.prove provides sane interface for internal proofs;
wenzelm@13478
   782
omits the infamous "standard" operation, so this is more appropriate
wenzelm@13478
   783
than prove_goalw_cterm in many situations (e.g. in simprocs);
wenzelm@13478
   784
wenzelm@13478
   785
* Pure: improved error reporting of simprocs;
wenzelm@13478
   786
wenzelm@13478
   787
* Provers: Simplifier.simproc(_i) provides sane interface for setting
wenzelm@13478
   788
up simprocs;
wenzelm@13478
   789
wenzelm@13478
   790
kleing@13953
   791
*** Document preparation ***
kleing@13953
   792
kleing@13953
   793
* uses \par instead of \\ for line breaks in theory text. This may
kleing@13953
   794
shift some page breaks in large documents. To get the old behaviour
kleing@13953
   795
use \renewcommand{\isanewline}{\mbox{}\\\mbox{}} in root.tex.
kleing@13953
   796
wenzelm@14731
   797
* minimized dependencies of isabelle.sty and isabellesym.sty on
kleing@13953
   798
other packages
kleing@13953
   799
kleing@13953
   800
* \<euro> now needs package babel/greek instead of marvosym (which
kleing@13953
   801
broke \Rightarrow)
kleing@13953
   802
wenzelm@14731
   803
* normal size for \<zero>...\<nine> (uses \mathbf instead of
kleing@13954
   804
textcomp package)
kleing@13953
   805
wenzelm@13280
   806
wenzelm@14572
   807
wenzelm@12984
   808
New in Isabelle2002 (March 2002)
wenzelm@12984
   809
--------------------------------
wenzelm@11474
   810
wenzelm@11572
   811
*** Document preparation ***
wenzelm@11572
   812
wenzelm@11842
   813
* greatly simplified document preparation setup, including more
wenzelm@11842
   814
graceful interpretation of isatool usedir -i/-d/-D options, and more
wenzelm@11842
   815
instructive isatool mkdir; users should basically be able to get
wenzelm@12899
   816
started with "isatool mkdir HOL Test && isatool make"; alternatively,
wenzelm@12899
   817
users may run a separate document processing stage manually like this:
wenzelm@12899
   818
"isatool usedir -D output HOL Test && isatool document Test/output";
wenzelm@11842
   819
wenzelm@11842
   820
* theory dependency graph may now be incorporated into documents;
wenzelm@11842
   821
isatool usedir -g true will produce session_graph.eps/.pdf for use
wenzelm@11842
   822
with \includegraphics of LaTeX;
wenzelm@11842
   823
wenzelm@11864
   824
* proper spacing of consecutive markup elements, especially text
wenzelm@11864
   825
blocks after section headings;
wenzelm@11864
   826
wenzelm@11572
   827
* support bold style (for single symbols only), input syntax is like
wenzelm@11572
   828
this: "\<^bold>\<alpha>" or "\<^bold>A";
wenzelm@11572
   829
wenzelm@11814
   830
* \<bullet> is now output as bold \cdot by default, which looks much
wenzelm@11572
   831
better in printed text;
wenzelm@11572
   832
wenzelm@11712
   833
* added default LaTeX bindings for \<tturnstile> and \<TTurnstile>;
wenzelm@11712
   834
note that these symbols are currently unavailable in Proof General /
wenzelm@12769
   835
X-Symbol; new symbols \<zero>, \<one>, ..., \<nine>, and \<euro>;
wenzelm@12690
   836
wenzelm@12690
   837
* isatool latex no longer depends on changed TEXINPUTS, instead
wenzelm@12690
   838
isatool document copies the Isabelle style files to the target
wenzelm@12690
   839
location;
wenzelm@11712
   840
wenzelm@11572
   841
wenzelm@11633
   842
*** Isar ***
wenzelm@11633
   843
wenzelm@12312
   844
* Pure/Provers: improved proof by cases and induction;
wenzelm@12280
   845
  - 'case' command admits impromptu naming of parameters (such as
wenzelm@12280
   846
    "case (Suc n)");
wenzelm@12280
   847
  - 'induct' method divinates rule instantiation from the inductive
wenzelm@12280
   848
    claim; no longer requires excessive ?P bindings for proper
wenzelm@12280
   849
    instantiation of cases;
wenzelm@12280
   850
  - 'induct' method properly enumerates all possibilities of set/type
wenzelm@12280
   851
    rules; as a consequence facts may be also passed through *type*
wenzelm@12280
   852
    rules without further ado;
wenzelm@12280
   853
  - 'induct' method now derives symbolic cases from the *rulified*
wenzelm@12280
   854
    rule (before it used to rulify cases stemming from the internal
wenzelm@12280
   855
    atomized version); this means that the context of a non-atomic
wenzelm@12280
   856
    statement becomes is included in the hypothesis, avoiding the
wenzelm@12280
   857
    slightly cumbersome show "PROP ?case" form;
wenzelm@12280
   858
  - 'induct' may now use elim-style induction rules without chaining
wenzelm@12280
   859
    facts, using ``missing'' premises from the goal state; this allows
wenzelm@12280
   860
    rules stemming from inductive sets to be applied in unstructured
wenzelm@12280
   861
    scripts, while still benefitting from proper handling of non-atomic
wenzelm@12280
   862
    statements; NB: major inductive premises need to be put first, all
wenzelm@12280
   863
    the rest of the goal is passed through the induction;
wenzelm@12280
   864
  - 'induct' proper support for mutual induction involving non-atomic
wenzelm@12280
   865
    rule statements (uses the new concept of simultaneous goals, see
wenzelm@12280
   866
    below);
wenzelm@12853
   867
  - append all possible rule selections, but only use the first
wenzelm@12853
   868
    success (no backtracking);
wenzelm@11995
   869
  - removed obsolete "(simplified)" and "(stripped)" options of methods;
wenzelm@12754
   870
  - undeclared rule case names default to numbers 1, 2, 3, ...;
wenzelm@12754
   871
  - added 'print_induct_rules' (covered by help item in recent Proof
wenzelm@12754
   872
    General versions);
wenzelm@11995
   873
  - moved induct/cases attributes to Pure, methods to Provers;
wenzelm@11995
   874
  - generic method setup instantiated for FOL and HOL;
wenzelm@11986
   875
wenzelm@12163
   876
* Pure: support multiple simultaneous goal statements, for example
wenzelm@12163
   877
"have a: A and b: B" (same for 'theorem' etc.); being a pure
wenzelm@12163
   878
meta-level mechanism, this acts as if several individual goals had
wenzelm@12163
   879
been stated separately; in particular common proof methods need to be
wenzelm@12163
   880
repeated in order to cover all claims; note that a single elimination
wenzelm@12163
   881
step is *not* sufficient to establish the two conjunctions, so this
wenzelm@12163
   882
fails:
wenzelm@12163
   883
wenzelm@12163
   884
  assume "A & B" then have A and B ..   (*".." fails*)
wenzelm@12163
   885
wenzelm@12163
   886
better use "obtain" in situations as above; alternative refer to
wenzelm@12163
   887
multi-step methods like 'auto', 'simp_all', 'blast+' etc.;
wenzelm@12163
   888
wenzelm@12078
   889
* Pure: proper integration with ``locales''; unlike the original
webertj@15154
   890
version by Florian Kammller, Isar locales package high-level proof
wenzelm@12078
   891
contexts rather than raw logical ones (e.g. we admit to include
wenzelm@12280
   892
attributes everywhere); operations on locales include merge and
wenzelm@12964
   893
rename; support for implicit arguments (``structures''); simultaneous
wenzelm@12964
   894
type-inference over imports and text; see also HOL/ex/Locales.thy for
wenzelm@12964
   895
some examples;
wenzelm@12078
   896
wenzelm@12707
   897
* Pure: the following commands have been ``localized'', supporting a
wenzelm@12707
   898
target locale specification "(in name)": 'lemma', 'theorem',
wenzelm@12707
   899
'corollary', 'lemmas', 'theorems', 'declare'; the results will be
wenzelm@12707
   900
stored both within the locale and at the theory level (exported and
wenzelm@12707
   901
qualified by the locale name);
wenzelm@12707
   902
wenzelm@12964
   903
* Pure: theory goals may now be specified in ``long'' form, with
wenzelm@12964
   904
ad-hoc contexts consisting of arbitrary locale elements. for example
wenzelm@12964
   905
``lemma foo: fixes x assumes "A x" shows "B x"'' (local syntax and
wenzelm@12964
   906
definitions may be given, too); the result is a meta-level rule with
wenzelm@12964
   907
the context elements being discharged in the obvious way;
wenzelm@12964
   908
wenzelm@12964
   909
* Pure: new proof command 'using' allows to augment currently used
wenzelm@12964
   910
facts after a goal statement ('using' is syntactically analogous to
wenzelm@12964
   911
'apply', but acts on the goal's facts only); this allows chained facts
wenzelm@12964
   912
to be separated into parts given before and after a claim, as in
wenzelm@12964
   913
``from a and b have C using d and e <proof>'';
wenzelm@12078
   914
wenzelm@11722
   915
* Pure: renamed "antecedent" case to "rule_context";
wenzelm@11722
   916
wenzelm@12964
   917
* Pure: new 'judgment' command records explicit information about the
wenzelm@12964
   918
object-logic embedding (used by several tools internally); no longer
wenzelm@12964
   919
use hard-wired "Trueprop";
wenzelm@12964
   920
wenzelm@11738
   921
* Pure: added 'corollary' command;
wenzelm@11738
   922
wenzelm@11722
   923
* Pure: fixed 'token_translation' command;
wenzelm@11722
   924
wenzelm@11899
   925
* Pure: removed obsolete 'exported' attribute;
wenzelm@11899
   926
wenzelm@11933
   927
* Pure: dummy pattern "_" in is/let is now automatically lifted over
wenzelm@11933
   928
bound variables: "ALL x. P x --> Q x" (is "ALL x. _ --> ?C x")
wenzelm@11899
   929
supersedes more cumbersome ... (is "ALL x. _ x --> ?C x");
wenzelm@11899
   930
wenzelm@11952
   931
* Pure: method 'atomize' presents local goal premises as object-level
wenzelm@11952
   932
statements (atomic meta-level propositions); setup controlled via
wenzelm@11952
   933
rewrite rules declarations of 'atomize' attribute; example
wenzelm@11952
   934
application: 'induct' method with proper rule statements in improper
wenzelm@11952
   935
proof *scripts*;
wenzelm@11952
   936
wenzelm@12106
   937
* Pure: emulation of instantiation tactics (rule_tac, cut_tac, etc.)
wenzelm@12106
   938
now consider the syntactic context of assumptions, giving a better
wenzelm@12106
   939
chance to get type-inference of the arguments right (this is
wenzelm@12106
   940
especially important for locales);
wenzelm@12106
   941
wenzelm@12312
   942
* Pure: "sorry" no longer requires quick_and_dirty in interactive
wenzelm@12312
   943
mode;
wenzelm@12312
   944
wenzelm@12405
   945
* Pure/obtain: the formal conclusion "thesis", being marked as
wenzelm@12405
   946
``internal'', may no longer be reference directly in the text;
wenzelm@12405
   947
potential INCOMPATIBILITY, may need to use "?thesis" in rare
wenzelm@12405
   948
situations;
wenzelm@12405
   949
wenzelm@12405
   950
* Pure: generic 'sym' attribute which declares a rule both as pure
wenzelm@12405
   951
'elim?' and for the 'symmetric' operation;
wenzelm@12405
   952
wenzelm@12877
   953
* Pure: marginal comments ``--'' may now occur just anywhere in the
wenzelm@12877
   954
text; the fixed correlation with particular command syntax has been
wenzelm@12877
   955
discontinued;
wenzelm@12877
   956
berghofe@13023
   957
* Pure: new method 'rules' is particularly well-suited for proof
berghofe@13023
   958
search in intuitionistic logic; a bit slower than 'blast' or 'fast',
berghofe@13023
   959
but often produces more compact proof terms with less detours;
berghofe@13023
   960
wenzelm@12364
   961
* Pure/Provers/classical: simplified integration with pure rule
wenzelm@12364
   962
attributes and methods; the classical "intro?/elim?/dest?"
wenzelm@12364
   963
declarations coincide with the pure ones; the "rule" method no longer
wenzelm@12364
   964
includes classically swapped intros; "intro" and "elim" methods no
wenzelm@12364
   965
longer pick rules from the context; also got rid of ML declarations
wenzelm@12364
   966
AddXIs/AddXEs/AddXDs; all of this has some potential for
wenzelm@12364
   967
INCOMPATIBILITY;
wenzelm@12364
   968
wenzelm@12405
   969
* Provers/classical: attribute 'swapped' produces classical inversions
wenzelm@12405
   970
of introduction rules;
wenzelm@12405
   971
wenzelm@12364
   972
* Provers/simplifier: 'simplified' attribute may refer to explicit
wenzelm@12364
   973
rules instead of full simplifier context; 'iff' attribute handles
wenzelm@12364
   974
conditional rules;
wenzelm@11936
   975
wenzelm@11745
   976
* HOL: 'typedef' now allows alternative names for Rep/Abs morphisms;
wenzelm@11745
   977
wenzelm@11690
   978
* HOL: 'recdef' now fails on unfinished automated proofs, use
wenzelm@11633
   979
"(permissive)" option to recover old behavior;
wenzelm@11633
   980
wenzelm@11933
   981
* HOL: 'inductive' no longer features separate (collective) attributes
wenzelm@11933
   982
for 'intros' (was found too confusing);
wenzelm@11933
   983
wenzelm@12405
   984
* HOL: properly declared induction rules less_induct and
wenzelm@12405
   985
wf_induct_rule;
wenzelm@12405
   986
kleing@11788
   987
wenzelm@11474
   988
*** HOL ***
wenzelm@11474
   989
wenzelm@11702
   990
* HOL: moved over to sane numeral syntax; the new policy is as
wenzelm@11702
   991
follows:
wenzelm@11702
   992
wenzelm@11702
   993
  - 0 and 1 are polymorphic constants, which are defined on any
wenzelm@11702
   994
  numeric type (nat, int, real etc.);
wenzelm@11702
   995
wenzelm@11702
   996
  - 2, 3, 4, ... and -1, -2, -3, ... are polymorphic numerals, based
wenzelm@11702
   997
  binary representation internally;
wenzelm@11702
   998
wenzelm@11702
   999
  - type nat has special constructor Suc, and generally prefers Suc 0
wenzelm@11702
  1000
  over 1::nat and Suc (Suc 0) over 2::nat;
wenzelm@11702
  1001
wenzelm@12364
  1002
This change may cause significant problems of INCOMPATIBILITY; here
wenzelm@12364
  1003
are some hints on converting existing sources:
wenzelm@11702
  1004
wenzelm@11702
  1005
  - due to the new "num" token, "-0" and "-1" etc. are now atomic
wenzelm@11702
  1006
  entities, so expressions involving "-" (unary or binary minus) need
wenzelm@11702
  1007
  to be spaced properly;
wenzelm@11702
  1008
wenzelm@11702
  1009
  - existing occurrences of "1" may need to be constraint "1::nat" or
wenzelm@11702
  1010
  even replaced by Suc 0; similar for old "2";
wenzelm@11702
  1011
wenzelm@11702
  1012
  - replace "#nnn" by "nnn", and "#-nnn" by "-nnn";
wenzelm@11702
  1013
wenzelm@11702
  1014
  - remove all special provisions on numerals in proofs;
wenzelm@11702
  1015
wenzelm@13042
  1016
* HOL: simp rules nat_number expand numerals on nat to Suc/0
wenzelm@12837
  1017
representation (depends on bin_arith_simps in the default context);
wenzelm@12837
  1018
wenzelm@12736
  1019
* HOL: symbolic syntax for x^2 (numeral 2);
wenzelm@12736
  1020
wenzelm@12335
  1021
* HOL: the class of all HOL types is now called "type" rather than
wenzelm@12335
  1022
"term"; INCOMPATIBILITY, need to adapt references to this type class
wenzelm@12335
  1023
in axclass/classes, instance/arities, and (usually rare) occurrences
wenzelm@12335
  1024
in typings (of consts etc.); internally the class is called
wenzelm@12335
  1025
"HOL.type", ML programs should refer to HOLogic.typeS;
wenzelm@12335
  1026
wenzelm@12280
  1027
* HOL/record package improvements:
wenzelm@12280
  1028
  - new derived operations "fields" to build a partial record section,
wenzelm@12280
  1029
    "extend" to promote a fixed record to a record scheme, and
wenzelm@12280
  1030
    "truncate" for the reverse; cf. theorems "xxx.defs", which are *not*
wenzelm@12280
  1031
    declared as simp by default;
wenzelm@12587
  1032
  - shared operations ("more", "fields", etc.) now need to be always
wenzelm@12587
  1033
    qualified) --- potential INCOMPATIBILITY;
wenzelm@12280
  1034
  - removed "make_scheme" operations (use "make" with "extend") --
wenzelm@12280
  1035
    INCOMPATIBILITY;
wenzelm@11937
  1036
  - removed "more" class (simply use "term") -- INCOMPATIBILITY;
wenzelm@12253
  1037
  - provides cases/induct rules for use with corresponding Isar
wenzelm@12253
  1038
    methods (for concrete records, record schemes, concrete more
wenzelm@12280
  1039
    parts, and schematic more parts -- in that order);
wenzelm@11930
  1040
  - internal definitions directly based on a light-weight abstract
wenzelm@11930
  1041
    theory of product types over typedef rather than datatype;
wenzelm@11930
  1042
berghofe@13023
  1043
* HOL: generic code generator for generating executable ML code from
berghofe@13023
  1044
specifications; specific support for HOL constructs such as inductive
berghofe@13023
  1045
datatypes and sets, as well as recursive functions; can be invoked
berghofe@13023
  1046
via 'generate_code' theory section;
berghofe@13023
  1047
wenzelm@11933
  1048
* HOL: canonical cases/induct rules for n-tuples (n = 3..7);
wenzelm@11933
  1049
paulson@13824
  1050
* HOL: consolidated and renamed several theories.  In particular:
wenzelm@14731
  1051
        Ord.thy has been absorbed into HOL.thy
wenzelm@14731
  1052
        String.thy has been absorbed into List.thy
wenzelm@14731
  1053
wenzelm@11802
  1054
* HOL: concrete setsum syntax "\<Sum>i:A. b" == "setsum (%i. b) A"
wenzelm@11802
  1055
(beware of argument permutation!);
wenzelm@11802
  1056
wenzelm@11657
  1057
* HOL: linorder_less_split superseded by linorder_cases;
wenzelm@11657
  1058
wenzelm@12917
  1059
* HOL/List: "nodups" renamed to "distinct";
nipkow@12889
  1060
wenzelm@11633
  1061
* HOL: added "The" definite description operator; move Hilbert's "Eps"
paulson@13824
  1062
to peripheral theory "Hilbert_Choice"; some INCOMPATIBILITIES:
paulson@13824
  1063
  - Ex_def has changed, now need to use some_eq_ex
wenzelm@11437
  1064
wenzelm@11572
  1065
* HOL: made split_all_tac safe; EXISTING PROOFS MAY FAIL OR LOOP, so
wenzelm@11572
  1066
in this (rare) case use:
wenzelm@11572
  1067
wenzelm@11572
  1068
  delSWrapper "split_all_tac"
wenzelm@11572
  1069
  addSbefore ("unsafe_split_all_tac", unsafe_split_all_tac)
wenzelm@11572
  1070
wenzelm@11572
  1071
* HOL: added safe wrapper "split_conv_tac" to claset; EXISTING PROOFS
wenzelm@11474
  1072
MAY FAIL;
nipkow@11361
  1073
wenzelm@11572
  1074
* HOL: introduced f^n = f o ... o f; warning: due to the limits of
wenzelm@11572
  1075
Isabelle's type classes, ^ on functions and relations has too general
wenzelm@11572
  1076
a domain, namely ('a * 'b) set and 'a => 'b; this means that it may be
wenzelm@11572
  1077
necessary to attach explicit type constraints;
nipkow@11307
  1078
wenzelm@12917
  1079
* HOL/Relation: the prefix name of the infix "O" has been changed from
wenzelm@12917
  1080
"comp" to "rel_comp"; INCOMPATIBILITY: a few theorems have been
wenzelm@12917
  1081
renamed accordingly (eg "compI" -> "rel_compI").
nipkow@12489
  1082
wenzelm@11487
  1083
* HOL: syntax translations now work properly with numerals and records
wenzelm@11487
  1084
expressions;
wenzelm@11474
  1085
wenzelm@12457
  1086
* HOL: bounded abstraction now uses syntax "%" / "\<lambda>" instead
wenzelm@12457
  1087
of "lam" -- INCOMPATIBILITY;
wenzelm@11474
  1088
wenzelm@11933
  1089
* HOL: got rid of some global declarations (potential INCOMPATIBILITY
wenzelm@11933
  1090
for ML tools): const "()" renamed "Product_Type.Unity", type "unit"
wenzelm@11933
  1091
renamed "Product_Type.unit";
wenzelm@11611
  1092
nipkow@12564
  1093
* HOL: renamed rtrancl_into_rtrancl2 to converse_rtrancl_into_rtrancl
nipkow@12564
  1094
wenzelm@12924
  1095
* HOL: removed obsolete theorem "optionE" (use "option.exhaust", or
wenzelm@12924
  1096
the "cases" method);
wenzelm@12924
  1097
wenzelm@12597
  1098
* HOL/GroupTheory: group theory examples including Sylow's theorem (by
webertj@15154
  1099
Florian Kammller);
wenzelm@12597
  1100
wenzelm@12608
  1101
* HOL/IMP: updated and converted to new-style theory format; several
wenzelm@12608
  1102
parts turned into readable document, with proper Isar proof texts and
wenzelm@12608
  1103
some explanations (by Gerwin Klein);
wenzelm@12597
  1104
wenzelm@12734
  1105
* HOL-Real: added Complex_Numbers (by Gertrud Bauer);
wenzelm@12734
  1106
wenzelm@12690
  1107
* HOL-Hyperreal is now a logic image;
wenzelm@12690
  1108
wenzelm@11611
  1109
wenzelm@12022
  1110
*** HOLCF ***
wenzelm@12022
  1111
wenzelm@12622
  1112
* Isar: consts/constdefs supports mixfix syntax for continuous
wenzelm@12622
  1113
operations;
wenzelm@12622
  1114
wenzelm@12622
  1115
* Isar: domain package adapted to new-style theory format, e.g. see
wenzelm@12622
  1116
HOLCF/ex/Dnat.thy;
wenzelm@12622
  1117
wenzelm@12622
  1118
* theory Lift: proper use of rep_datatype lift instead of ML hacks --
wenzelm@12280
  1119
potential INCOMPATIBILITY; now use plain induct_tac instead of former
wenzelm@12280
  1120
lift.induct_tac, always use UU instead of Undef;
wenzelm@12022
  1121
wenzelm@12597
  1122
* HOLCF/IMP: updated and converted to new-style theory;
wenzelm@12597
  1123
wenzelm@12022
  1124
wenzelm@11474
  1125
*** ZF ***
wenzelm@11474
  1126
wenzelm@12622
  1127
* Isar: proper integration of logic-specific tools and packages,
wenzelm@12622
  1128
including theory commands '(co)inductive', '(co)datatype',
wenzelm@12622
  1129
'rep_datatype', 'inductive_cases', as well as methods 'ind_cases',
wenzelm@12622
  1130
'induct_tac', 'case_tac', and 'typecheck' (with attribute 'TC');
wenzelm@12622
  1131
wenzelm@12622
  1132
* theory Main no longer includes AC; for the Axiom of Choice, base
wenzelm@12622
  1133
your theory on Main_ZFC;
wenzelm@12622
  1134
wenzelm@12622
  1135
* the integer library now covers quotients and remainders, with many
wenzelm@12622
  1136
laws relating division to addition, multiplication, etc.;
paulson@12563
  1137
wenzelm@12280
  1138
* ZF/UNITY: Chandy and Misra's UNITY is now available in ZF, giving a
wenzelm@12280
  1139
typeless version of the formalism;
wenzelm@12280
  1140
wenzelm@13025
  1141
* ZF/AC, Coind, IMP, Resid: updated and converted to new-style theory
wenzelm@13025
  1142
format;
wenzelm@12608
  1143
wenzelm@12280
  1144
* ZF/Induct: new directory for examples of inductive definitions,
wenzelm@12608
  1145
including theory Multiset for multiset orderings; converted to
wenzelm@12608
  1146
new-style theory format;
wenzelm@12177
  1147
wenzelm@13025
  1148
* ZF: many new theorems about lists, ordinals, etc.;
paulson@12850
  1149
wenzelm@11474
  1150
wenzelm@11474
  1151
*** General ***
wenzelm@11474
  1152
wenzelm@12280
  1153
* Pure/kernel: meta-level proof terms (by Stefan Berghofer); reference
wenzelm@12280
  1154
variable proof controls level of detail: 0 = no proofs (only oracle
wenzelm@12280
  1155
dependencies), 1 = lemma dependencies, 2 = compact proof terms; see
wenzelm@12280
  1156
also ref manual for further ML interfaces;
wenzelm@12280
  1157
wenzelm@12280
  1158
* Pure/axclass: removed obsolete ML interface
wenzelm@12280
  1159
goal_subclass/goal_arity;
wenzelm@12280
  1160
wenzelm@12280
  1161
* Pure/syntax: new token syntax "num" for plain numerals (without "#"
wenzelm@12280
  1162
of "xnum"); potential INCOMPATIBILITY, since -0, -1 etc. are now
wenzelm@12280
  1163
separate tokens, so expressions involving minus need to be spaced
wenzelm@12280
  1164
properly;
wenzelm@12280
  1165
wenzelm@12312
  1166
* Pure/syntax: support non-oriented infixes, using keyword "infix"
wenzelm@12312
  1167
rather than "infixl" or "infixr";
wenzelm@12312
  1168
wenzelm@12312
  1169
* Pure/syntax: concrete syntax for dummy type variables admits genuine
wenzelm@12312
  1170
sort constraint specifications in type inference; e.g. "x::_::foo"
wenzelm@12312
  1171
ensures that the type of "x" is of sort "foo" (but not necessarily a
wenzelm@12312
  1172
type variable);
wenzelm@12280
  1173
wenzelm@12280
  1174
* Pure/syntax: print modes "type_brackets" and "no_type_brackets"
wenzelm@12280
  1175
control output of nested => (types); the default behavior is
wenzelm@12280
  1176
"type_brackets";
wenzelm@12280
  1177
wenzelm@12280
  1178
* Pure/syntax: builtin parse translation for "_constify" turns valued
wenzelm@11817
  1179
tokens into AST constants;
wenzelm@11474
  1180
wenzelm@12280
  1181
* Pure/syntax: prefer later declarations of translations and print
wenzelm@12280
  1182
translation functions; potential INCOMPATIBILITY: need to reverse
wenzelm@12280
  1183
multiple declarations for same syntax element constant;
wenzelm@12280
  1184
wenzelm@12832
  1185
* Pure/show_hyps reset by default (in accordance to existing Isar
wenzelm@12832
  1186
practice);
wenzelm@12832
  1187
wenzelm@12280
  1188
* Provers/classical: renamed addaltern to addafter, addSaltern to
wenzelm@12280
  1189
addSafter;
wenzelm@12280
  1190
wenzelm@12280
  1191
* Provers/clasimp: ``iff'' declarations now handle conditional rules
wenzelm@12280
  1192
as well;
wenzelm@12253
  1193
wenzelm@12538
  1194
* system: tested support for MacOS X; should be able to get Isabelle +
wenzelm@12538
  1195
Proof General to work in a plain Terminal after installing Poly/ML
wenzelm@12538
  1196
(e.g. from the Isabelle distribution area) and GNU bash alone
wenzelm@12538
  1197
(e.g. from http://www.apple.com); full X11, XEmacs and X-Symbol
wenzelm@12538
  1198
support requires further installations, e.g. from
wenzelm@12538
  1199
http://fink.sourceforge.net/);
wenzelm@12538
  1200
wenzelm@12280
  1201
* system: support Poly/ML 4.1.1 (able to manage larger heaps);
wenzelm@11551
  1202
wenzelm@12753
  1203
* system: reduced base memory usage by Poly/ML (approx. 20 MB instead
wenzelm@12753
  1204
of 40 MB), cf. ML_OPTIONS;
wenzelm@12753
  1205
wenzelm@11633
  1206
* system: Proof General keywords specification is now part of the
wenzelm@11633
  1207
Isabelle distribution (see etc/isar-keywords.el);
wenzelm@11633
  1208
wenzelm@12728
  1209
* system: support for persistent Proof General sessions (refrain from
wenzelm@12728
  1210
outdating all loaded theories on startup); user may create writable
wenzelm@12728
  1211
logic images like this: ``isabelle -q HOL Test'';
wenzelm@12597
  1212
wenzelm@11551
  1213
* system: smart selection of Isabelle process versus Isabelle
wenzelm@11572
  1214
interface, accommodates case-insensitive file systems (e.g. HFS+); may
wenzelm@11572
  1215
run both "isabelle" and "Isabelle" even if file names are badly
wenzelm@11572
  1216
damaged (executable inspects the case of the first letter of its own
wenzelm@11572
  1217
name); added separate "isabelle-process" and "isabelle-interface";
wenzelm@11551
  1218
wenzelm@12472
  1219
* system: refrain from any attempt at filtering input streams; no
wenzelm@12472
  1220
longer support ``8bit'' encoding of old isabelle font, instead proper
wenzelm@12472
  1221
iso-latin characters may now be used; the related isatools
wenzelm@12472
  1222
"symbolinput" and "nonascii" have disappeared as well;
wenzelm@12472
  1223
wenzelm@12472
  1224
* system: removed old "xterm" interface (the print modes "xterm" and
wenzelm@12472
  1225
"xterm_color" are still available for direct use in a suitable
wenzelm@12472
  1226
terminal);
wenzelm@12472
  1227
paulson@11314
  1228
oheimb@11169
  1229
wenzelm@11062
  1230
New in Isabelle99-2 (February 2001)
wenzelm@11062
  1231
-----------------------------------
wenzelm@11062
  1232
nipkow@10224
  1233
*** Overview of INCOMPATIBILITIES ***
nipkow@10224
  1234
paulson@11241
  1235
* HOL: please note that theories in the Library and elsewhere often use the
paulson@11241
  1236
new-style (Isar) format; to refer to their theorems in an ML script you must
wenzelm@12622
  1237
bind them to ML identifers by e.g.      val thm_name = thm "thm_name";
paulson@11241
  1238
wenzelm@11043
  1239
* HOL: inductive package no longer splits induction rule aggressively,
wenzelm@11043
  1240
but only as far as specified by the introductions given; the old
oheimb@11130
  1241
format may be recovered via ML function complete_split_rule or attribute
wenzelm@11043
  1242
'split_rule (complete)';
wenzelm@11043
  1243
wenzelm@10998
  1244
* HOL: induct renamed to lfp_induct, lfp_Tarski to lfp_unfold,
wenzelm@10998
  1245
gfp_Tarski to gfp_unfold;
nipkow@10224
  1246
paulson@10288
  1247
* HOL: contrapos, contrapos2 renamed to contrapos_nn, contrapos_pp;
paulson@10288
  1248
wenzelm@10858
  1249
* HOL: infix "dvd" now has priority 50 rather than 70 (because it is a
wenzelm@10858
  1250
relation); infix "^^" has been renamed "``"; infix "``" has been
wenzelm@10858
  1251
renamed "`"; "univalent" has been renamed "single_valued";
nipkow@10793
  1252
wenzelm@10998
  1253
* HOL/Real: "rinv" and "hrinv" replaced by overloaded "inverse"
wenzelm@10998
  1254
operation;
wenzelm@10998
  1255
nipkow@10868
  1256
* HOLCF: infix "`" has been renamed "$"; the symbol syntax is \<cdot>;
nipkow@10856
  1257
wenzelm@10391
  1258
* Isar: 'obtain' no longer declares "that" fact as simp/intro;
wenzelm@10391
  1259
wenzelm@10401
  1260
* Isar/HOL: method 'induct' now handles non-atomic goals; as a
wenzelm@10401
  1261
consequence, it is no longer monotonic wrt. the local goal context
wenzelm@10401
  1262
(which is now passed through the inductive cases);
wenzelm@10401
  1263
wenzelm@10976
  1264
* Document preparation: renamed standard symbols \<ll> to \<lless> and
wenzelm@10976
  1265
\<gg> to \<ggreater>;
wenzelm@10976
  1266
nipkow@10224
  1267
wenzelm@10245
  1268
*** Document preparation ***
wenzelm@10245
  1269
wenzelm@10858
  1270
* \isabellestyle{NAME} selects version of Isabelle output (currently
wenzelm@10858
  1271
available: are "it" for near math-mode best-style output, "sl" for
wenzelm@10858
  1272
slanted text style, and "tt" for plain type-writer; if no
wenzelm@10858
  1273
\isabellestyle command is given, output is according to slanted
wenzelm@10858
  1274
type-writer);
wenzelm@10858
  1275
wenzelm@10322
  1276
* support sub/super scripts (for single symbols only), input syntax is
wenzelm@10322
  1277
like this: "A\<^sup>*" or "A\<^sup>\<star>";
wenzelm@10322
  1278
wenzelm@10858
  1279
* some more standard symbols; see Appendix A of the system manual for
wenzelm@11062
  1280
the complete list of symbols defined in isabellesym.sty;
wenzelm@10858
  1281
wenzelm@10998
  1282
* improved isabelle style files; more abstract symbol implementation
wenzelm@10998
  1283
(should now use \isamath{...} and \isatext{...} in custom symbol
wenzelm@10998
  1284
definitions);
wenzelm@10998
  1285
wenzelm@10634
  1286
* antiquotation @{goals} and @{subgoals} for output of *dynamic* goals
wenzelm@10634
  1287
state; Note that presentation of goal states does not conform to
wenzelm@10634
  1288
actual human-readable proof documents.  Please do not include goal
wenzelm@10634
  1289
states into document output unless you really know what you are doing!
wenzelm@10322
  1290
wenzelm@11062
  1291
* proper indentation of antiquoted output with proportional LaTeX
wenzelm@11062
  1292
fonts;
wenzelm@10862
  1293
wenzelm@11050
  1294
* no_document ML operator temporarily disables LaTeX document
wenzelm@11050
  1295
generation;
wenzelm@11050
  1296
wenzelm@11062
  1297
* isatool unsymbolize tunes sources for plain ASCII communication;
wenzelm@11062
  1298
wenzelm@10322
  1299
wenzelm@10306
  1300
*** Isar ***
wenzelm@10306
  1301
wenzelm@10547
  1302
* Pure: Isar now suffers initial goal statements to contain unbound
wenzelm@10547
  1303
schematic variables (this does not conform to actual readable proof
wenzelm@10547
  1304
documents, due to unpredictable outcome and non-compositional proof
wenzelm@10547
  1305
checking); users who know what they are doing may use schematic goals
wenzelm@10547
  1306
for Prolog-style synthesis of proven results;
wenzelm@10547
  1307
wenzelm@10391
  1308
* Pure: assumption method (an implicit finishing) now handles actual
wenzelm@10391
  1309
rules as well;
wenzelm@10391
  1310
wenzelm@10391
  1311
* Pure: improved 'obtain' --- moved to Pure, insert "that" into
wenzelm@10391
  1312
initial goal, declare "that" only as Pure intro (only for single
wenzelm@10391
  1313
steps); the "that" rule assumption may now be involved in implicit
wenzelm@10391
  1314
finishing, thus ".." becomes a feasible for trivial obtains;
wenzelm@10391
  1315
wenzelm@10391
  1316
* Pure: default proof step now includes 'intro_classes'; thus trivial
wenzelm@10391
  1317
instance proofs may be performed by "..";
wenzelm@10391
  1318
wenzelm@10391
  1319
* Pure: ?thesis / ?this / "..." now work for pure meta-level
wenzelm@10391
  1320
statements as well;
wenzelm@10306
  1321
wenzelm@11097
  1322
* Pure: more robust selection of calculational rules;
wenzelm@11097
  1323
wenzelm@10858
  1324
* Pure: the builtin notion of 'finished' goal now includes the ==-refl
wenzelm@10858
  1325
rule (as well as the assumption rule);
wenzelm@10858
  1326
wenzelm@10858
  1327
* Pure: 'thm_deps' command visualizes dependencies of theorems and
wenzelm@10858
  1328
lemmas, using the graph browser tool;
wenzelm@10858
  1329
wenzelm@10944
  1330
* Pure: predict failure of "show" in interactive mode;
wenzelm@10944
  1331
wenzelm@11016
  1332
* Pure: 'thms_containing' now takes actual terms as arguments;
wenzelm@11016
  1333
wenzelm@10401
  1334
* HOL: improved method 'induct' --- now handles non-atomic goals
wenzelm@10401
  1335
(potential INCOMPATIBILITY); tuned error handling;
wenzelm@10401
  1336
wenzelm@10557
  1337
* HOL: cases and induct rules now provide explicit hints about the
wenzelm@10547
  1338
number of facts to be consumed (0 for "type" and 1 for "set" rules);
wenzelm@10547
  1339
any remaining facts are inserted into the goal verbatim;
wenzelm@10547
  1340
wenzelm@10858
  1341
* HOL: local contexts (aka cases) may now contain term bindings as
wenzelm@10858
  1342
well; the 'cases' and 'induct' methods new provide a ?case binding for
wenzelm@10858
  1343
the result to be shown in each case;
wenzelm@10858
  1344
wenzelm@10770
  1345
* HOL: added 'recdef_tc' command;
wenzelm@10770
  1346
wenzelm@11016
  1347
* isatool convert assists in eliminating legacy ML scripts;
wenzelm@11016
  1348
wenzelm@10306
  1349
wenzelm@10245
  1350
*** HOL ***
wenzelm@10245
  1351
wenzelm@10245
  1352
* HOL/Library: a collection of generic theories to be used together
wenzelm@10245
  1353
with main HOL; the theory loader path already includes this directory
wenzelm@10245
  1354
by default; the following existing theories have been moved here:
wenzelm@10245
  1355
HOL/Induct/Multiset, HOL/Induct/Acc (as Accessible_Part), HOL/While
wenzelm@10337
  1356
(as While_Combinator), HOL/Lex/Prefix (as List_Prefix);
wenzelm@10245
  1357
wenzelm@10966
  1358
* HOL/Unix: "Some aspects of Unix file-system security", a typical
wenzelm@10966
  1359
modelling and verification task performed in Isabelle/HOL +
wenzelm@10966
  1360
Isabelle/Isar + Isabelle document preparation (by Markus Wenzel).
wenzelm@10966
  1361
wenzelm@11094
  1362
* HOL/Algebra: special summation operator SUM no longer exists, it has
wenzelm@11094
  1363
been replaced by setsum; infix 'assoc' now has priority 50 (like
wenzelm@11094
  1364
'dvd'); axiom 'one_not_zero' has been moved from axclass 'ring' to
wenzelm@11094
  1365
'domain', this makes the theory consistent with mathematical
wenzelm@11094
  1366
literature;
wenzelm@11094
  1367
wenzelm@10514
  1368
* HOL basics: added overloaded operations "inverse" and "divide"
wenzelm@10726
  1369
(infix "/"), syntax for generic "abs" operation, generic summation
wenzelm@11094
  1370
operator \<Sum>;
wenzelm@10452
  1371
wenzelm@10391
  1372
* HOL/typedef: simplified package, provide more useful rules (see also
wenzelm@10391
  1373
HOL/subset.thy);
wenzelm@10391
  1374
wenzelm@10915
  1375
* HOL/datatype: induction rule for arbitrarily branching datatypes is
wenzelm@10915
  1376
now expressed as a proper nested rule (old-style tactic scripts may
wenzelm@10915
  1377
require atomize_strip_tac to cope with non-atomic premises);
wenzelm@10915
  1378
wenzelm@10915
  1379
* HOL: renamed theory "Prod" to "Product_Type", renamed "split" rule
wenzelm@10915
  1380
to "split_conv" (old name still available for compatibility);
wenzelm@10915
  1381
wenzelm@10915
  1382
* HOL: improved concrete syntax for strings (e.g. allows translation
wenzelm@10915
  1383
rules with string literals);
wenzelm@10915
  1384
paulson@12245
  1385
* HOL-Real-Hyperreal: this extends HOL-Real with the hyperreals
paulson@12245
  1386
 and Fleuriot's mechanization of analysis, including the transcendental
paulson@12245
  1387
 functions for the reals;
paulson@10756
  1388
wenzelm@11094
  1389
* HOL/Real, HOL/Hyperreal: improved arithmetic simplification;
wenzelm@10391
  1390
wenzelm@10858
  1391
paulson@10474
  1392
*** CTT ***
paulson@10474
  1393
wenzelm@10547
  1394
* CTT: x-symbol support for Pi, Sigma, -->, : (membership); note that
wenzelm@10547
  1395
"lam" is displayed as TWO lambda-symbols
paulson@10474
  1396
wenzelm@10547
  1397
* CTT: theory Main now available, containing everything (that is, Bool
wenzelm@10547
  1398
and Arith);
wenzelm@10547
  1399
paulson@10474
  1400
wenzelm@10391
  1401
*** General ***
wenzelm@10391
  1402
wenzelm@10547
  1403
* Pure: the Simplifier has been implemented properly as a derived rule
wenzelm@10547
  1404
outside of the actual kernel (at last!); the overall performance
wenzelm@10547
  1405
penalty in practical applications is about 50%, while reliability of
wenzelm@10547
  1406
the Isabelle inference kernel has been greatly improved;
wenzelm@10547
  1407
wenzelm@11112
  1408
* print modes "brackets" and "no_brackets" control output of nested =>
wenzelm@11112
  1409
(types) and ==> (props); the default behaviour is "brackets";
wenzelm@11112
  1410
wenzelm@10391
  1411
* Provers: fast_tac (and friends) now handle actual object-logic rules
wenzelm@10391
  1412
as assumptions as well;
wenzelm@10391
  1413
wenzelm@11124
  1414
* system: support Poly/ML 4.0;
wenzelm@11124
  1415
wenzelm@11124
  1416
* system: isatool install handles KDE version 1 or 2;
wenzelm@11124
  1417
wenzelm@10391
  1418
wenzelm@10245
  1419
wenzelm@10103
  1420
New in Isabelle99-1 (October 2000)
wenzelm@10103
  1421
----------------------------------
wenzelm@8015
  1422
wenzelm@10003
  1423
*** Overview of INCOMPATIBILITIES ***
paulson@8014
  1424
wenzelm@8848
  1425
* HOL: simplification of natural numbers is much changed; to partly
wenzelm@8848
  1426
recover the old behaviour (e.g. to prevent n+n rewriting to #2*n)
wenzelm@8848
  1427
issue the following ML commands:
wenzelm@8848
  1428
wenzelm@8848
  1429
  Delsimprocs Nat_Numeral_Simprocs.cancel_numerals;
wenzelm@8848
  1430
  Delsimprocs [Nat_Numeral_Simprocs.combine_numerals];
paulson@8788
  1431
wenzelm@10129
  1432
* HOL: simplification no longer dives into case-expressions; this is
wenzelm@10129
  1433
controlled by "t.weak_case_cong" for each datatype t;
wenzelm@10003
  1434
wenzelm@10003
  1435
* HOL: nat_less_induct renamed to less_induct;
wenzelm@10003
  1436
wenzelm@10003
  1437
* HOL: systematic renaming of the SOME (Eps) rules, may use isatool
wenzelm@10003
  1438
fixsome to patch .thy and .ML sources automatically;
paulson@8967
  1439
wenzelm@10003
  1440
  select_equality  -> some_equality
wenzelm@10003
  1441
  select_eq_Ex     -> some_eq_ex
wenzelm@10003
  1442
  selectI2EX       -> someI2_ex
wenzelm@10003
  1443
  selectI2         -> someI2
wenzelm@10003
  1444
  selectI          -> someI
wenzelm@10003
  1445
  select1_equality -> some1_equality
wenzelm@10003
  1446
  Eps_sym_eq       -> some_sym_eq_trivial
wenzelm@10003
  1447
  Eps_eq           -> some_eq_trivial
wenzelm@10003
  1448
wenzelm@10003
  1449
* HOL: exhaust_tac on datatypes superceded by new generic case_tac;
wenzelm@10003
  1450
wenzelm@10003
  1451
* HOL: removed obsolete theorem binding expand_if (refer to split_if
wenzelm@10003
  1452
instead);
wenzelm@10003
  1453
wenzelm@10003
  1454
* HOL: the recursion equations generated by 'recdef' are now called
wenzelm@10003
  1455
f.simps instead of f.rules;
wenzelm@10003
  1456
wenzelm@10003
  1457
* HOL: qed_spec_mp now also handles bounded ALL as well;
wenzelm@10003
  1458
wenzelm@10003
  1459
* HOL: 0 is now overloaded, so the type constraint ":: nat" may
wenzelm@10003
  1460
sometimes be needed;
wenzelm@10003
  1461
wenzelm@10003
  1462
* HOL: the constant for "f``x" is now "image" rather than "op ``";
paulson@8014
  1463
paulson@10065
  1464
* HOL: the constant for "f-``x" is now "vimage" rather than "op -``";
paulson@10065
  1465
wenzelm@9330
  1466
* HOL: the disjoint sum is now "<+>" instead of "Plus"; the cartesian
wenzelm@9330
  1467
product is now "<*>" instead of "Times"; the lexicographic product is
wenzelm@9330
  1468
now "<*lex*>" instead of "**";
nipkow@8705
  1469
wenzelm@10003
  1470
* HOL: theory Sexp is now in HOL/Induct examples (it used to be part
wenzelm@10003
  1471
of main HOL, but was unused); better use HOL's datatype package;
paulson@9971
  1472
wenzelm@10137
  1473
* HOL: removed "symbols" syntax for constant "override" of theory Map;
wenzelm@10137
  1474
the old syntax may be recovered as follows:
wenzelm@10137
  1475
wenzelm@10137
  1476
  syntax (symbols)
wenzelm@10137
  1477
    override  :: "('a ~=> 'b) => ('a ~=> 'b) => ('a ~=> 'b)"
wenzelm@10137
  1478
      (infixl "\\<oplus>" 100)
wenzelm@10137
  1479
wenzelm@8848
  1480
* HOL/Real: "rabs" replaced by overloaded "abs" function;
wenzelm@8848
  1481
wenzelm@8887
  1482
* HOL/ML: even fewer consts are declared as global (see theories Ord,
wenzelm@8887
  1483
Lfp, Gfp, WF); this only affects ML packages that refer to const names
wenzelm@8887
  1484
internally;
wenzelm@8887
  1485
wenzelm@10003
  1486
* HOL and ZF: syntax for quotienting wrt an equivalence relation
wenzelm@10003
  1487
changed from A/r to A//r;
wenzelm@9908
  1488
wenzelm@10003
  1489
* ZF: new treatment of arithmetic (nat & int) may break some old
wenzelm@10003
  1490
proofs;
wenzelm@8921
  1491
wenzelm@10003
  1492
* Isar: renamed some attributes (RS -> THEN, simplify -> simplified,
wenzelm@10003
  1493
rulify -> rule_format, elimify -> elim_format, ...);
paulson@9542
  1494
wenzelm@9941
  1495
* Isar/Provers: intro/elim/dest attributes changed; renamed
wenzelm@9941
  1496
intro/intro!/intro!! flags to intro!/intro/intro? (in most cases, one
wenzelm@9937
  1497
should have to change intro!! to intro? only); replaced "delrule" by
wenzelm@9937
  1498
"rule del";
wenzelm@9437
  1499
wenzelm@9612
  1500
* Isar/HOL: renamed "intrs" to "intros" in inductive definitions;
wenzelm@9612
  1501
wenzelm@9437
  1502
* Provers: strengthened force_tac by using new first_best_tac;
oheimb@9402
  1503
wenzelm@10003
  1504
* LaTeX document preparation: several changes of isabelle.sty (see
wenzelm@10003
  1505
lib/texinputs);
wenzelm@8729
  1506
paulson@8014
  1507
wenzelm@8487
  1508
*** Document preparation ***
wenzelm@8358
  1509
wenzelm@9198
  1510
* formal comments (text blocks etc.) in new-style theories may now
wenzelm@9753
  1511
contain antiquotations of thm/prop/term/typ/text to be presented
wenzelm@9753
  1512
according to latex print mode; concrete syntax is like this:
wenzelm@9753
  1513
@{term[show_types] "f(x) = a + x"};
wenzelm@9198
  1514
wenzelm@8358
  1515
* isatool mkdir provides easy setup of Isabelle session directories,
wenzelm@8518
  1516
including proper document sources;
wenzelm@8358
  1517
wenzelm@8358
  1518
* generated LaTeX sources are now deleted after successful run
wenzelm@8358
  1519
(isatool document -c); may retain a copy somewhere else via -D option
wenzelm@8358
  1520
of isatool usedir;
wenzelm@8358
  1521
wenzelm@8566
  1522
* isatool usedir -D now lets isatool latex -o sty update the Isabelle
wenzelm@10003
  1523
style files, achieving self-contained LaTeX sources and simplifying
wenzelm@10003
  1524
LaTeX debugging;
wenzelm@8566
  1525
wenzelm@8518
  1526
* old-style theories now produce (crude) LaTeX output as well;
wenzelm@8358
  1527
wenzelm@9057
  1528
* browser info session directories are now self-contained (may be put
wenzelm@9437
  1529
on WWW server seperately); improved graphs of nested sessions; removed
wenzelm@9437
  1530
graph for 'all sessions';
wenzelm@9057
  1531
wenzelm@10003
  1532
* several improvements in isabelle style files; \isabellestyle{it}
wenzelm@10003
  1533
produces fake math mode output; \isamarkupheader is now \section by
wenzelm@10003
  1534
default; see lib/texinputs/isabelle.sty etc.;
wenzelm@9489
  1535
wenzelm@8358
  1536
wenzelm@8184
  1537
*** Isar ***
wenzelm@8184
  1538
wenzelm@10003
  1539
* Isar/Pure: local results and corresponding term bindings are now
wenzelm@10003
  1540
subject to Hindley-Milner polymorphism (similar to ML); this
wenzelm@10003
  1541
accommodates incremental type-inference very nicely;
wenzelm@8283
  1542
wenzelm@10003
  1543
* Isar/Pure: new derived language element 'obtain' supports
wenzelm@10003
  1544
generalized existence reasoning;
wenzelm@8621
  1545
wenzelm@10003
  1546
* Isar/Pure: new calculational elements 'moreover' and 'ultimately'
wenzelm@10003
  1547
support accumulation of results, without applying any rules yet;
wenzelm@10003
  1548
useful to collect intermediate results without explicit name
wenzelm@10003
  1549
references, and for use with transitivity rules with more than 2
wenzelm@10003
  1550
premises;
wenzelm@8184
  1551
wenzelm@10003
  1552
* Isar/Pure: scalable support for case-analysis type proofs: new
wenzelm@10003
  1553
'case' language element refers to local contexts symbolically, as
wenzelm@10003
  1554
produced by certain proof methods; internally, case names are attached
wenzelm@10003
  1555
to theorems as "tags";
wenzelm@8440
  1556
wenzelm@10003
  1557
* Isar/Pure: theory command 'hide' removes declarations from
wenzelm@9330
  1558
class/type/const name spaces;
wenzelm@9330
  1559
wenzelm@10003
  1560
* Isar/Pure: theory command 'defs' supports option "(overloaded)" to
wenzelm@9330
  1561
indicate potential overloading;
wenzelm@9330
  1562
wenzelm@10003
  1563
* Isar/Pure: changed syntax of local blocks from {{ }} to { };
wenzelm@8621
  1564
wenzelm@10003
  1565
* Isar/Pure: syntax of sorts made 'inner', i.e. have to write
wenzelm@10003
  1566
"{a,b,c}" instead of {a,b,c};
wenzelm@9011
  1567
wenzelm@10003
  1568
* Isar/Pure now provides its own version of intro/elim/dest
wenzelm@10003
  1569
attributes; useful for building new logics, but beware of confusion
wenzelm@10003
  1570
with the version in Provers/classical;
wenzelm@9612
  1571
wenzelm@10003
  1572
* Isar/Pure: the local context of (non-atomic) goals is provided via
wenzelm@10003
  1573
case name 'antecedent';
wenzelm@8440
  1574
wenzelm@10003
  1575
* Isar/Pure: removed obsolete 'transfer' attribute (transfer of thms
wenzelm@10003
  1576
to the current context is now done automatically);
wenzelm@9383
  1577
wenzelm@10003
  1578
* Isar/Pure: theory command 'method_setup' provides a simple interface
wenzelm@10003
  1579
for definining proof methods in ML;
wenzelm@9612
  1580
wenzelm@10003
  1581
* Isar/Provers: intro/elim/dest attributes changed; renamed
wenzelm@9941
  1582
intro/intro!/intro!! flags to intro!/intro/intro? (INCOMPATIBILITY, in
wenzelm@9941
  1583
most cases, one should have to change intro!! to intro? only);
wenzelm@9941
  1584
replaced "delrule" by "rule del";
wenzelm@8283
  1585
wenzelm@10003
  1586
* Isar/Provers: new 'hypsubst' method, plain 'subst' method and
wenzelm@10003
  1587
'symmetric' attribute (the latter supercedes [RS sym]);
wenzelm@10003
  1588
wenzelm@10003
  1589
* Isar/Provers: splitter support (via 'split' attribute and 'simp'
wenzelm@10003
  1590
method modifier); 'simp' method: 'only:' modifier removes loopers as
wenzelm@10003
  1591
well (including splits);
wenzelm@10003
  1592
wenzelm@10003
  1593
* Isar/Provers: Simplifier and Classical methods now support all kind
wenzelm@10003
  1594
of modifiers used in the past, including 'cong', 'iff', etc.
wenzelm@10003
  1595
wenzelm@10003
  1596
* Isar/Provers: added 'fastsimp' and 'clarsimp' methods (combination
wenzelm@10003
  1597
of Simplifier and Classical reasoner);
wenzelm@10003
  1598
wenzelm@10003
  1599
* Isar/HOL: new proof method 'cases' and improved version of 'induct'
wenzelm@10003
  1600
now support named cases; major packages (inductive, datatype, primrec,
wenzelm@10003
  1601
recdef) support case names and properly name parameters;
wenzelm@9612
  1602
wenzelm@10003
  1603
* Isar/HOL: new transitivity rules for substitution in inequalities --
wenzelm@10003
  1604
monotonicity conditions are extracted to be proven at end of
wenzelm@10003
  1605
calculations;
wenzelm@10003
  1606
wenzelm@10003
  1607
* Isar/HOL: removed 'case_split' thm binding, should use 'cases' proof
wenzelm@10003
  1608
method anyway;
wenzelm@10003
  1609
wenzelm@10003
  1610
* Isar/HOL: removed old expand_if = split_if; theorems if_splits =
wenzelm@10003
  1611
split_if split_if_asm; datatype package provides theorems foo.splits =
wenzelm@10003
  1612
foo.split foo.split_asm for each datatype;
wenzelm@10003
  1613
wenzelm@10003
  1614
* Isar/HOL: tuned inductive package, rename "intrs" to "intros"
wenzelm@10003
  1615
(potential INCOMPATIBILITY), emulation of mk_cases feature for proof
wenzelm@10003
  1616
scripts: new 'inductive_cases' command and 'ind_cases' method; (Note:
wenzelm@10003
  1617
use "(cases (simplified))" method in proper proof texts);
wenzelm@10003
  1618
wenzelm@10003
  1619
* Isar/HOL: added global 'arith_split' attribute for 'arith' method;
wenzelm@10003
  1620
wenzelm@10003
  1621
* Isar: names of theorems etc. may be natural numbers as well;
wenzelm@10003
  1622
wenzelm@10003
  1623
* Isar: 'pr' command: optional arguments for goals_limit and
wenzelm@9724
  1624
ProofContext.prems_limit; no longer prints theory contexts, but only
wenzelm@9724
  1625
proof states;
wenzelm@8487
  1626
wenzelm@10003
  1627
* Isar: diagnostic commands 'pr', 'thm', 'prop', 'term', 'typ' admit
wenzelm@8518
  1628
additional print modes to be specified; e.g. "pr(latex)" will print
wenzelm@8518
  1629
proof state according to the Isabelle LaTeX style;
wenzelm@8487
  1630
wenzelm@10003
  1631
* Isar: improved support for emulating tactic scripts, including proof
wenzelm@9612
  1632
methods 'rule_tac' etc., 'cut_tac', 'thin_tac', 'subgoal_tac',
wenzelm@9612
  1633
'rename_tac', 'rotate_tac', 'tactic', and 'case_tac' / 'induct_tac'
wenzelm@9612
  1634
(for HOL datatypes);
wenzelm@8534
  1635
wenzelm@10003
  1636
* Isar: simplified (more robust) goal selection of proof methods: 1st
wenzelm@10003
  1637
goal, all goals, or explicit goal specifier (tactic emulation); thus
wenzelm@10003
  1638
'proof method scripts' have to be in depth-first order;
wenzelm@8673
  1639
wenzelm@10003
  1640
* Isar: tuned 'let' syntax: replaced 'as' keyword by 'and';
wenzelm@8729
  1641
wenzelm@10003
  1642
* Isar: removed 'help' command, which hasn't been too helpful anyway;
wenzelm@10003
  1643
should instead use individual commands for printing items
wenzelm@10003
  1644
(print_commands, print_methods etc.);
wenzelm@9224
  1645
wenzelm@10003
  1646
* Isar: added 'nothing' --- the empty list of theorems;
wenzelm@9239
  1647
wenzelm@8184
  1648
paulson@8014
  1649
*** HOL ***
paulson@8014
  1650
wenzelm@10080
  1651
* HOL/MicroJava: formalization of a fragment of Java, together with a
wenzelm@10080
  1652
corresponding virtual machine and a specification of its bytecode
wenzelm@10080
  1653
verifier and a lightweight bytecode verifier, including proofs of
wenzelm@10080
  1654
type-safety; by Gerwin Klein, Tobias Nipkow, David von Oheimb, and
wenzelm@10080
  1655
Cornelia Pusch (see also the homepage of project Bali at
wenzelm@10080
  1656
http://isabelle.in.tum.de/Bali/);
wenzelm@10080
  1657
wenzelm@8518
  1658
* HOL/Algebra: new theory of rings and univariate polynomials, by
wenzelm@8518
  1659
Clemens Ballarin;
paulson@8014
  1660
wenzelm@10157
  1661
* HOL/NumberTheory: fundamental Theorem of Arithmetic, Chinese
wenzelm@10003
  1662
Remainder Theorem, Fermat/Euler Theorem, Wilson's Theorem, by Thomas M
wenzelm@10003
  1663
Rasmussen;
wenzelm@8570
  1664
wenzelm@10157
  1665
* HOL/Lattice: fundamental concepts of lattice theory and order
wenzelm@10157
  1666
structures, including duals, properties of bounds versus algebraic
wenzelm@10157
  1667
laws, lattice operations versus set-theoretic ones, the Knaster-Tarski
wenzelm@10157
  1668
Theorem for complete lattices etc.; may also serve as a demonstration
wenzelm@10157
  1669
for abstract algebraic reasoning using axiomatic type classes, and
wenzelm@10157
  1670
mathematics-style proof in Isabelle/Isar; by Markus Wenzel;
wenzelm@10157
  1671
wenzelm@10003
  1672
* HOL/Prolog: a (bare-bones) implementation of Lambda-Prolog, by David
wenzelm@10003
  1673
von Oheimb;
paulson@9542
  1674
wenzelm@10164
  1675
* HOL/IMPP: extension of IMP with local variables and mutually
wenzelm@10164
  1676
recursive procedures, by David von Oheimb;
wenzelm@10164
  1677
wenzelm@10003
  1678
* HOL/Lambda: converted into new-style theory and document;
paulson@9542
  1679
wenzelm@10003
  1680
* HOL/ex/Multiquote: example of multiple nested quotations and
wenzelm@10003
  1681
anti-quotations -- basically a generalized version of de-Bruijn
wenzelm@10003
  1682
representation; very useful in avoiding lifting of operations;
wenzelm@8848
  1683
wenzelm@9612
  1684
* HOL/record: added general record equality rule to simpset; fixed
wenzelm@9612
  1685
select-update simplification procedure to handle extended records as
wenzelm@9612
  1686
well; admit "r" as field name;
paulson@9542
  1687
paulson@8967
  1688
* HOL: 0 is now overloaded over the new sort "zero", allowing its use with
paulson@8967
  1689
other numeric types and also as the identity of groups, rings, etc.;
paulson@8967
  1690
paulson@8967
  1691
* HOL: new axclass plus_ac0 for addition with the AC-laws and 0 as identity.
paulson@8967
  1692
Types nat and int belong to this axclass;
paulson@8967
  1693
wenzelm@10003
  1694
* HOL: greatly improved simplification involving numerals of type nat, int, real:
paulson@8788
  1695
   (i + #8 + j) = Suc k simplifies to  #7 + (i + j) = k
paulson@8832
  1696
   i*j + k + j*#3*i     simplifies to  #4*(i*j) + k
paulson@8832
  1697
  two terms #m*u and #n*u are replaced by #(m+n)*u
paulson@8832
  1698
    (where #m, #n and u can implicitly be 1; this is simproc combine_numerals)
paulson@8832
  1699
  and the term/formula #m*u+x ~~ #n*u+y simplifies simplifies to #(m-n)+x ~~ y
paulson@8832
  1700
    or x ~~ #(n-m)+y, where ~~ is one of = < <= or - (simproc cancel_numerals);
paulson@8736
  1701
wenzelm@10003
  1702
* HOL: meson_tac is available (previously in ex/meson.ML); it is a
wenzelm@10003
  1703
powerful prover for predicate logic but knows nothing of clasets; see
wenzelm@10003
  1704
ex/mesontest.ML and ex/mesontest2.ML for example applications;
paulson@9835
  1705
wenzelm@8848
  1706
* HOL: new version of "case_tac" subsumes both boolean case split and
wenzelm@8440
  1707
"exhaust_tac" on datatypes; INCOMPATIBILITY: exhaust_tac no longer
wenzelm@8518
  1708
exists, may define val exhaust_tac = case_tac for ad-hoc portability;
wenzelm@8440
  1709
wenzelm@8848
  1710
* HOL: simplification no longer dives into case-expressions: only the
wenzelm@10129
  1711
selector expression is simplified, but not the remaining arms; to
wenzelm@10129
  1712
enable full simplification of case-expressions for datatype t, you may
wenzelm@10129
  1713
remove t.weak_case_cong from the simpset, either globally (Delcongs
wenzelm@10129
  1714
[thm"t.weak_case_cong"];) or locally (delcongs [...]).
nipkow@8603
  1715
wenzelm@8848
  1716
* HOL/recdef: the recursion equations generated by 'recdef' for
wenzelm@8848
  1717
function 'f' are now called f.simps instead of f.rules; if all
wenzelm@8848
  1718
termination conditions are proved automatically, these simplification
wenzelm@8848
  1719
rules are added to the simpset, as in primrec; rules may be named
wenzelm@8848
  1720
individually as well, resulting in a separate list of theorems for
wenzelm@8848
  1721
each equation;
wenzelm@8848
  1722
wenzelm@9489
  1723
* HOL/While is a new theory that provides a while-combinator. It
wenzelm@9489
  1724
permits the definition of tail-recursive functions without the
wenzelm@9489
  1725
provision of a termination measure. The latter is necessary once the
wenzelm@9489
  1726
invariant proof rule for while is applied.
nipkow@9457
  1727
wenzelm@10003
  1728
* HOL: new (overloaded) notation for the set of elements below/above
wenzelm@10003
  1729
some element: {..u}, {..u(}, {l..}, {)l..}. See theory SetInterval.
nipkow@8925
  1730
wenzelm@8848
  1731
* HOL: theorems impI, allI, ballI bound as "strip";
wenzelm@8848
  1732
wenzelm@10003
  1733
* HOL: new tactic induct_thm_tac: thm -> string -> int -> tactic
nipkow@9746
  1734
induct_tac th "x1 ... xn" expects th to have a conclusion of the form
nipkow@9746
  1735
P v1 ... vn and abbreviates res_inst_tac [("v1","x1"),...,("vn","xn")] th;
nipkow@9746
  1736
wenzelm@10003
  1737
* HOL/Real: "rabs" replaced by overloaded "abs" function;
nipkow@9737
  1738
wenzelm@10003
  1739
* HOL: theory Sexp now in HOL/Induct examples (it used to be part of
wenzelm@10003
  1740
main HOL, but was unused);
nipkow@8626
  1741
wenzelm@10003
  1742
* HOL: fewer consts declared as global (e.g. have to refer to
wenzelm@10003
  1743
"Lfp.lfp" instead of "lfp" internally; affects ML packages only);
wenzelm@8887
  1744
wenzelm@10003
  1745
* HOL: tuned AST representation of nested pairs, avoiding bogus output
wenzelm@10003
  1746
in case of overlap with user translations (e.g. judgements over
wenzelm@10003
  1747
tuples); (note that the underlying logical represenation is still
wenzelm@10003
  1748
bogus);
wenzelm@9349
  1749
nipkow@8412
  1750
paulson@9542
  1751
*** ZF ***
paulson@9542
  1752
wenzelm@10003
  1753
* ZF: simplification automatically cancels common terms in arithmetic
wenzelm@10003
  1754
expressions over nat and int;
paulson@9542
  1755
wenzelm@10003
  1756
* ZF: new treatment of nat to minimize type-checking: all operators
wenzelm@10003
  1757
coerce their operands to a natural number using the function natify,
wenzelm@10003
  1758
making the algebraic laws unconditional;
paulson@9542
  1759
wenzelm@10003
  1760
* ZF: as above, for int: operators coerce their operands to an integer
wenzelm@10003
  1761
using the function intify;
paulson@9542
  1762
wenzelm@10003
  1763
* ZF: the integer library now contains many of the usual laws for the
wenzelm@10003
  1764
orderings, including $<=, and monotonicity laws for $+ and $*;
paulson@9542
  1765
wenzelm@10003
  1766
* ZF: new example ZF/ex/NatSum to demonstrate integer arithmetic
wenzelm@10003
  1767
simplification;
paulson@9388
  1768
wenzelm@10003
  1769
* FOL and ZF: AddIffs now available, giving theorems of the form P<->Q
wenzelm@10003
  1770
to the simplifier and classical reasoner simultaneously;
paulson@9388
  1771
paulson@9388
  1772
wenzelm@8358
  1773
*** General ***
wenzelm@8358
  1774
wenzelm@10003
  1775
* Provers: blast_tac now handles actual object-logic rules as
wenzelm@10003
  1776
assumptions; note that auto_tac uses blast_tac internally as well;
wenzelm@10003
  1777
wenzelm@10003
  1778
* Provers: new functions rulify/rulify_no_asm: thm -> thm for turning
wenzelm@10003
  1779
outer -->/All/Ball into ==>/!!; qed_spec_mp now uses rulify_no_asm;
wenzelm@10003
  1780
wenzelm@9941
  1781
* Provers: delrules now handles destruct rules as well (no longer need
wenzelm@9941
  1782
explicit make_elim);
wenzelm@9941
  1783
wenzelm@10003
  1784
* Provers: Blast_tac now warns of and ignores "weak elimination rules" e.g.
wenzelm@10003
  1785
  [| inj ?f;          ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
wenzelm@10003
  1786
use instead the strong form,
wenzelm@10003
  1787
  [| inj ?f; ~ ?W ==> ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
wenzelm@10003
  1788
in HOL, FOL and ZF the function cla_make_elim will create such rules
wenzelm@10003
  1789
from destruct-rules;
wenzelm@9489
  1790
wenzelm@9709
  1791
* Provers: Simplifier.easy_setup provides a fast path to basic
wenzelm@9709
  1792
Simplifier setup for new object-logics;
wenzelm@9709
  1793
wenzelm@9709
  1794
* Pure: AST translation rules no longer require constant head on LHS;
wenzelm@9349
  1795
wenzelm@9709
  1796
* Pure: improved name spaces: ambiguous output is qualified; support
wenzelm@9709
  1797
for hiding of names;
wenzelm@8729
  1798
wenzelm@10003
  1799
* system: smart setup of canonical ML_HOME, ISABELLE_INTERFACE, and
wenzelm@10003
  1800
XSYMBOL_HOME; no longer need to do manual configuration in most
wenzelm@10003
  1801
situations;
wenzelm@10003
  1802
wenzelm@9709
  1803
* system: compression of ML heaps images may now be controlled via -c
wenzelm@9709
  1804
option of isabelle and isatool usedir (currently only observed by
wenzelm@9709
  1805
Poly/ML);
wenzelm@8358
  1806
wenzelm@9981
  1807
* system: isatool installfonts may handle X-Symbol fonts as well (very
wenzelm@9981
  1808
useful for remote X11);
wenzelm@9981
  1809
wenzelm@9709
  1810
* system: provide TAGS file for Isabelle sources;
wenzelm@9052
  1811
wenzelm@9288
  1812
* ML: infix 'OF' is a version of 'MRS' with more appropriate argument
wenzelm@9288
  1813
order;
wenzelm@9288
  1814
wenzelm@8994
  1815
* ML: renamed flags Syntax.trace_norm_ast to Syntax.trace_ast; global
wenzelm@8994
  1816
timing flag supersedes proof_timing and Toplevel.trace;
wenzelm@8994
  1817
wenzelm@10003
  1818
* ML: new combinators |>> and |>>> for incremental transformations
wenzelm@10003
  1819
with secondary results (e.g. certain theory extensions):
wenzelm@10003
  1820
wenzelm@9330
  1821
* ML: PureThy.add_defs gets additional argument to indicate potential
wenzelm@9330
  1822
overloading (usually false);
wenzelm@9330
  1823
wenzelm@10003
  1824
* ML: PureThy.add_thms/add_axioms/add_defs now return theorems as
wenzelm@10003
  1825
results;
wenzelm@8440
  1826
wenzelm@8358
  1827
wenzelm@8015
  1828
wenzelm@7986
  1829
New in Isabelle99 (October 1999)
wenzelm@7986
  1830
--------------------------------
oheimb@4649
  1831
paulson@5931
  1832
*** Overview of INCOMPATIBILITIES (see below for more details) ***
paulson@5931
  1833
paulson@6922
  1834
* HOL: The THEN and ELSE parts of conditional expressions (if P then x else y)
paulson@6922
  1835
are no longer simplified.  (This allows the simplifier to unfold recursive
paulson@6922
  1836
functional programs.)  To restore the old behaviour, declare
wenzelm@7215
  1837
wenzelm@7215
  1838
    Delcongs [if_weak_cong];
paulson@6922
  1839
wenzelm@6269
  1840
* HOL: Removed the obsolete syntax "Compl A"; use -A for set
wenzelm@6269
  1841
complement;
paulson@5931
  1842
wenzelm@6269
  1843
* HOL: the predicate "inj" is now defined by translation to "inj_on";
paulson@6174
  1844
berghofe@7847
  1845
* HOL/datatype: mutual_induct_tac no longer exists --
berghofe@7847
  1846
  use induct_tac "x_1 ... x_n" instead of mutual_induct_tac ["x_1", ..., "x_n"]
berghofe@7847
  1847
wenzelm@6386
  1848
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
  1849
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
  1850
wenzelm@6269
  1851
* ZF: The con_defs part of an inductive definition may no longer refer
wenzelm@6269
  1852
to constants declared in the same theory;
nipkow@6057
  1853
wenzelm@6269
  1854
* HOL, ZF: the function mk_cases, generated by the inductive
wenzelm@6269
  1855
definition package, has lost an argument.  To simplify its result, it
wenzelm@6269
  1856
uses the default simpset instead of a supplied list of theorems.
paulson@6141
  1857
wenzelm@7215
  1858
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
  1859
nipkow@7619
  1860
* Simplifier: the type of the infix ML functions
wenzelm@8729
  1861
        setSSolver addSSolver setSolver addSolver
nipkow@7619
  1862
is now  simpset * solver -> simpset  where `solver' is a new abstract type
nipkow@7619
  1863
for packaging solvers. A solver is created via
wenzelm@8729
  1864
        mk_solver: string -> (thm list -> int -> tactic) -> solver
nipkow@7619
  1865
where the string argument is only a comment.
nipkow@6057
  1866
wenzelm@7647
  1867
paulson@6069
  1868
*** Proof tools ***
paulson@6069
  1869
wenzelm@6343
  1870
* Provers/Arith/fast_lin_arith.ML contains a functor for creating a
wenzelm@6343
  1871
decision procedure for linear arithmetic. Currently it is used for
wenzelm@7593
  1872
types `nat', `int', and `real' in HOL (see below); it can, should and
wenzelm@7593
  1873
will be instantiated for other types and logics as well.
paulson@6069
  1874
nipkow@7324
  1875
* The simplifier now accepts rewrite rules with flexible heads, eg
nipkow@7324
  1876
     hom ?f ==> ?f(?x+?y) = ?f ?x + ?f ?y
nipkow@7324
  1877
  They are applied like any rule with a non-pattern lhs, i.e. by first-order
nipkow@7324
  1878
  matching.
paulson@6069
  1879
wenzelm@7593
  1880
paulson@6014
  1881
*** General ***
paulson@6014
  1882
wenzelm@7986
  1883
* New Isabelle/Isar subsystem provides an alternative to traditional
wenzelm@7215
  1884
tactical theorem proving; together with the ProofGeneral/isar user
wenzelm@7215
  1885
interface it offers an interactive environment for developing human
wenzelm@7215
  1886
readable proof documents (Isar == Intelligible semi-automated
wenzelm@7886
  1887
reasoning); for further information see isatool doc isar-ref,
wenzelm@7986
  1888
src/HOL/Isar_examples and http://isabelle.in.tum.de/Isar/
wenzelm@7886
  1889
wenzelm@9612
  1890
* improved and simplified presentation of theories: better HTML markup
wenzelm@9612
  1891
(including colors), graph views in several sizes; isatool usedir now
wenzelm@9612
  1892
provides a proper interface for user theories (via -P option); actual
wenzelm@9612
  1893
document preparation based on (PDF)LaTeX is available as well (for
wenzelm@9612
  1894
new-style theories only); see isatool doc system for more information;
wenzelm@7215
  1895
wenzelm@7252
  1896
* native support for Proof General, both for classic Isabelle and
wenzelm@7986
  1897
Isabelle/Isar;
wenzelm@7215
  1898
wenzelm@7791
  1899
* ML function thm_deps visualizes dependencies of theorems and lemmas,
wenzelm@7791
  1900
using the graph browser tool;
wenzelm@7791
  1901
wenzelm@6751
  1902
* Isabelle manuals now also available as PDF;
wenzelm@6751
  1903
wenzelm@6449
  1904
* theory loader rewritten from scratch (may not be fully
wenzelm@6449
  1905
bug-compatible); old loadpath variable has been replaced by show_path,
wenzelm@6671
  1906
add_path, del_path, reset_path functions; new operations such as
wenzelm@7593
  1907
update_thy, touch_thy, remove_thy, use/update_thy_only (see also
wenzelm@7593
  1908
isatool doc ref);
wenzelm@6449
  1909
wenzelm@7215
  1910
* improved isatool install: option -k creates KDE application icon,
wenzelm@7215
  1911
option -p DIR installs standalone binaries;
wenzelm@7215
  1912
wenzelm@7215
  1913
* added ML_PLATFORM setting (useful for cross-platform installations);
wenzelm@7215
  1914
more robust handling of platform specific ML images for SML/NJ;
wenzelm@7215
  1915
wenzelm@7886
  1916
* the settings environment is now statically scoped, i.e. it is never
wenzelm@7986
  1917
created again in sub-processes invoked from isabelle, isatool, or
wenzelm@7886
  1918
Isabelle;
wenzelm@7886
  1919
wenzelm@7215
  1920
* path element specification '~~' refers to '$ISABELLE_HOME';
wenzelm@7215
  1921
wenzelm@6343
  1922
* in locales, the "assumes" and "defines" parts may be omitted if
wenzelm@6343
  1923
empty;
wenzelm@5973
  1924
wenzelm@6269
  1925
* new print_mode "xsymbols" for extended symbol support (e.g. genuine
wenzelm@6269
  1926
long arrows);
wenzelm@6259
  1927
wenzelm@6343
  1928
* new print_mode "HTML";
wenzelm@6343
  1929
wenzelm@6343
  1930
* new flag show_tags controls display of tags of theorems (which are
wenzelm@6343
  1931
basically just comments that may be attached by some tools);
wenzelm@6343
  1932
wenzelm@6461
  1933
* Isamode 2.6 requires patch to accomodate change of Isabelle font
wenzelm@6461
  1934
mode and goal output format:
wenzelm@6461
  1935
wenzelm@6461
  1936
diff -r Isamode-2.6/elisp/isa-load.el Isamode/elisp/isa-load.el
wenzelm@6461
  1937
244c244
wenzelm@6461
  1938
<       (list (isa-getenv "ISABELLE") "-msymbols" logic-name)
wenzelm@6461
  1939
---
wenzelm@6533
  1940
>       (list (isa-getenv "ISABELLE") "-misabelle_font" "-msymbols" logic-name)
wenzelm@6461
  1941
diff -r Isabelle-2.6/elisp/isa-proofstate.el Isamode/elisp/isa-proofstate.el
wenzelm@6461
  1942
181c181
wenzelm@6461
  1943
< (defconst proofstate-proofstart-regexp "^Level [0-9]+$"
wenzelm@6461
  1944
---
wenzelm@6461
  1945
> (defconst proofstate-proofstart-regexp "^Level [0-9]+"
wenzelm@6461
  1946
wenzelm@7450
  1947
* function bind_thms stores lists of theorems (cf. bind_thm);
wenzelm@7450
  1948
wenzelm@7593
  1949
* new shorthand tactics ftac, eatac, datac, fatac;
wenzelm@7593
  1950
wenzelm@7593
  1951
* qed (and friends) now accept "" as result name; in that case the
wenzelm@7986
  1952
theorem is not stored, but proper checks and presentation of the
wenzelm@7986
  1953
result still apply;
wenzelm@7593
  1954
wenzelm@7805
  1955
* theorem database now also indexes constants "Trueprop", "all",
wenzelm@7805
  1956
"==>", "=="; thus thms_containing, findI etc. may retrieve more rules;
wenzelm@7805
  1957
oheimb@6028
  1958
nipkow@6057
  1959
*** HOL ***
nipkow@6057
  1960
wenzelm@7215
  1961
** HOL arithmetic **
wenzelm@7215
  1962
wenzelm@6343
  1963
* There are now decision procedures for linear arithmetic over nat and
wenzelm@6343
  1964
int:
nipkow@6131
  1965
wenzelm@6343
  1966
1. arith_tac copes with arbitrary formulae involving `=', `<', `<=',
wenzelm@6343
  1967
`+', `-', `Suc', `min', `max' and numerical constants; other subterms
wenzelm@6343
  1968
are treated as atomic; subformulae not involving type `nat' or `int'
wenzelm@6343
  1969
are ignored; quantified subformulae are ignored unless they are
wenzelm@6343
  1970
positive universal or negative existential. The tactic has to be
wenzelm@6343
  1971
invoked by hand and can be a little bit slow. In particular, the
wenzelm@6343
  1972
running time is exponential in the number of occurrences of `min' and
wenzelm@6343
  1973
`max', and `-' on `nat'.
nipkow@6131
  1974
wenzelm@6343
  1975
2. fast_arith_tac is a cut-down version of arith_tac: it only takes
wenzelm@6343
  1976
(negated) (in)equalities among the premises and the conclusion into
wenzelm@6343
  1977
account (i.e. no compound formulae) and does not know about `min' and
wenzelm@6343
  1978
`max', and `-' on `nat'. It is fast and is used automatically by the
wenzelm@6343
  1979
simplifier.
nipkow@6131
  1980
wenzelm@6343
  1981
NB: At the moment, these decision procedures do not cope with mixed
wenzelm@6343
  1982
nat/int formulae where the two parts interact, such as `m < n ==>
wenzelm@6343
  1983
int(m) < int(n)'.
oheimb@6028
  1984
wenzelm@7215
  1985
* HOL/Numeral provides a generic theory of numerals (encoded
wenzelm@7313
  1986
efficiently as bit strings); setup for types nat/int/real is in place;
wenzelm@7215
  1987
INCOMPATIBILITY: since numeral syntax is now polymorphic, rather than
wenzelm@7215
  1988
int, existing theories and proof scripts may require a few additional
wenzelm@7215
  1989
type constraints;
wenzelm@7215
  1990
wenzelm@7215
  1991
* integer division and remainder can now be performed on constant
wenzelm@7215
  1992
arguments;
paulson@7157
  1993
wenzelm@7215
  1994
* many properties of integer multiplication, division and remainder
wenzelm@7215
  1995
are now available;
paulson@6922
  1996
paulson@7287
  1997
* An interface to the Stanford Validity Checker (SVC) is available through the
paulson@7287
  1998
tactic svc_tac.  Propositional tautologies and theorems of linear arithmetic
paulson@7287
  1999
are proved automatically.  SVC must be installed separately, and its results
paulson@7287
  2000
must be TAKEN ON TRUST (Isabelle does not check the proofs, but tags any
paulson@7287
  2001
invocation of the underlying oracle).  For SVC see
paulson@7444
  2002
  http://verify.stanford.edu/SVC
paulson@6922
  2003
wenzelm@7125
  2004
* IsaMakefile: the HOL-Real target now builds an actual image;
wenzelm@7125
  2005
wenzelm@7215
  2006
wenzelm@7215
  2007
** HOL misc **
wenzelm@7215
  2008
wenzelm@7595
  2009
* HOL/Real/HahnBanach: the Hahn-Banach theorem for real vector spaces
wenzelm@7595
  2010
(in Isabelle/Isar) -- by Gertrud Bauer;
wenzelm@7595
  2011
wenzelm@7691
  2012
* HOL/BCV: generic model of bytecode verification, i.e. data-flow
wenzelm@7691
  2013
analysis for assembly languages with subtypes;
wenzelm@7691
  2014
wenzelm@6278
  2015
* HOL/TLA (Lamport's Temporal Logic of Actions): major reorganization
wenzelm@6278
  2016
-- avoids syntactic ambiguities and treats state, transition, and
wenzelm@6278
  2017
temporal levels more uniformly; introduces INCOMPATIBILITIES due to
wenzelm@6278
  2018
changed syntax and (many) tactics;
wenzelm@6278
  2019
wenzelm@7791
  2020
* HOL/inductive: Now also handles more general introduction rules such
wenzelm@7791
  2021
  as "ALL y. (y, x) : r --> y : acc r ==> x : acc r"; monotonicity
wenzelm@7791
  2022
  theorems are now maintained within the theory (maintained via the
wenzelm@7791
  2023
  "mono" attribute);
berghofe@7780
  2024
wenzelm@7238
  2025
* HOL/datatype: Now also handles arbitrarily branching datatypes
wenzelm@7238
  2026
  (using function types) such as
wenzelm@7238
  2027
wenzelm@7238
  2028
  datatype 'a tree = Atom 'a | Branch "nat => 'a tree"
berghofe@7047
  2029
wenzelm@7326
  2030
* HOL/record: record_simproc (part of the default simpset) takes care
wenzelm@7326
  2031
of selectors applied to updated records; record_split_tac is no longer
wenzelm@7327
  2032
part of the default claset; update_defs may now be removed from the
wenzelm@7327
  2033
simpset in many cases; COMPATIBILITY: old behavior achieved by
wenzelm@7326
  2034
wenzelm@7326
  2035
  claset_ref () := claset() addSWrapper record_split_wrapper;
wenzelm@7326
  2036
  Delsimprocs [record_simproc]
wenzelm@7326
  2037
wenzelm@6386
  2038
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
  2039
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
  2040
paulson@7287
  2041
* HOL/recdef (TFL): 'congs' syntax now expects comma separated list of theorem
paulson@7287
  2042
names rather than an ML expression;
paulson@7287
  2043
paulson@7287
  2044
* HOL/defer_recdef (TFL): like recdef but the well-founded relation can be
paulson@7287
  2045
supplied later.  Program schemes can be defined, such as
paulson@7287
  2046
    "While B C s = (if B s then While B C (C s) else s)"
paulson@7287
  2047
where the well-founded relation can be chosen after B and C have been given.
wenzelm@6563
  2048
wenzelm@7215
  2049
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
  2050
INCOMPATIBILITY: while [] and infix # syntax is still there, of
wenzelm@7215
  2051
course, ML tools referring to List.list.op # etc. have to be adapted;
wenzelm@7215
  2052
wenzelm@7238
  2053
* HOL_quantifiers flag superseded by "HOL" print mode, which is
wenzelm@7238
  2054
disabled by default; run isabelle with option -m HOL to get back to
wenzelm@7238
  2055
the original Gordon/HOL-style output;
wenzelm@7238
  2056
wenzelm@7238
  2057
* HOL/Ord.thy: new bounded quantifier syntax (input only): ALL x<y. P,
wenzelm@7238
  2058
ALL x<=y. P, EX x<y. P, EX x<=y. P;
wenzelm@7238
  2059
wenzelm@7238
  2060
* HOL basic syntax simplified (more orthogonal): all variants of
wenzelm@7238
  2061
All/Ex now support plain / symbolic / HOL notation; plain syntax for
wenzelm@7238
  2062
Eps operator is provided as well: "SOME x. P[x]";
wenzelm@7238
  2063
berghofe@7320
  2064
* HOL/Sum.thy: sum_case has been moved to HOL/Datatype;
wenzelm@7261
  2065
wenzelm@7280
  2066
* HOL/Univ.thy: infix syntax <*>, <+>, <**>, <+> eliminated and made
wenzelm@7280
  2067
thus available for user theories;
wenzelm@7280
  2068
wenzelm@7300
  2069
* HOLCF/IOA/Sequents: renamed 'Cons' to 'Consq' to avoid clash with
wenzelm@7300
  2070
HOL/List; hardly an INCOMPATIBILITY since '>>' syntax is used all the
wenzelm@7300
  2071
time;
wenzelm@7300
  2072
wenzelm@7986
  2073
* HOL: new tactic smp_tac: int -> int -> tactic, which applies spec
wenzelm@7986
  2074
several times and then mp;
oheimb@7492
  2075
wenzelm@7215
  2076
paulson@7113
  2077
*** LK ***
paulson@7113
  2078
wenzelm@7215
  2079
* the notation <<...>> is now available as a notation for sequences of
wenzelm@7215
  2080
formulas;
paulson@7113
  2081
paulson@7113
  2082
* the simplifier is now installed
paulson@7113
  2083
wenzelm@8729
  2084
* the axiom system has been generalized (thanks to Soren Heilmann)
paulson@7113
  2085
paulson@7113
  2086
* the classical reasoner now has a default rule database
paulson@7113
  2087
paulson@7113
  2088
paulson@6064
  2089
*** ZF ***
paulson@6064
  2090
paulson@6064
  2091
* new primrec section allows primitive recursive functions to be given
wenzelm@6269
  2092
directly (as in HOL) over datatypes and the natural numbers;
paulson@6064
  2093
wenzelm@6269
  2094
* new tactics induct_tac and exhaust_tac for induction (or case
wenzelm@6269
  2095
analysis) over datatypes and the natural numbers;
paulson@6064
  2096
paulson@6064
  2097
* the datatype declaration of type T now defines the recursor T_rec;
paulson@6064
  2098
paulson@6141
  2099
* simplification automatically does freeness reasoning for datatype
wenzelm@6269
  2100
constructors;
paulson@6141
  2101
wenzelm@6269
  2102
* automatic type-inference, with AddTCs command to insert new
wenzelm@6269
  2103
type-checking rules;
paulson@6155
  2104
wenzelm@6269
  2105
* datatype introduction rules are now added as Safe Introduction rules
wenzelm@6269
  2106
to the claset;
paulson@6155
  2107
wenzelm@6269
  2108
* the syntax "if P then x else y" is now available in addition to
wenzelm@6269
  2109
if(P,x,y);
wenzelm@6269
  2110
paulson@6069
  2111
wenzelm@6343
  2112
*** Internal programming interfaces ***
wenzelm@6343
  2113
wenzelm@7919
  2114
* tuned simplifier trace output; new flag debug_simp;
wenzelm@7919
  2115
wenzelm@7420
  2116
* structures Vartab / Termtab (instances of TableFun) offer efficient
wenzelm@7420
  2117
tables indexed by indexname_ord / term_ord (compatible with aconv);
wenzelm@7420
  2118
wenzelm@6386
  2119
* AxClass.axclass_tac lost the theory argument;
wenzelm@6386
  2120
wenzelm@6343
  2121
* tuned current_goals_markers semantics: begin / end goal avoids
wenzelm@6343
  2122
printing empty lines;
wenzelm@6343
  2123
wenzelm@6343
  2124
* removed prs and prs_fn hook, which was broken because it did not
wenzelm@6343
  2125
include \n in its semantics, forcing writeln to add one
wenzelm@6343
  2126
uncoditionally; replaced prs_fn by writeln_fn; consider std_output:
wenzelm@6343
  2127
string -> unit if you really want to output text without newline;
wenzelm@6343
  2128
wenzelm@6343
  2129
* Symbol.output subject to print mode; INCOMPATIBILITY: defaults to
wenzelm@6343
  2130
plain output, interface builders may have to enable 'isabelle_font'
wenzelm@6343
  2131
mode to get Isabelle font glyphs as before;
wenzelm@6343
  2132
wenzelm@6343
  2133
* refined token_translation interface; INCOMPATIBILITY: output length
wenzelm@6343
  2134
now of type real instead of int;
wenzelm@6343
  2135
wenzelm@7196
  2136
* theory loader actions may be traced via new ThyInfo.add_hook
wenzelm@7196
  2137
interface (see src/Pure/Thy/thy_info.ML); example application: keep
wenzelm@7196
  2138
your own database of information attached to *whole* theories -- as
wenzelm@7196
  2139
opposed to intra-theory data slots offered via TheoryDataFun;
wenzelm@7196
  2140
wenzelm@7647
  2141
* proper handling of dangling sort hypotheses (at last!);
wenzelm@7647
  2142
Thm.strip_shyps and Drule.strip_shyps_warning take care of removing
wenzelm@7647
  2143
extra sort hypotheses that can be witnessed from the type signature;
wenzelm@7986
  2144
the force_strip_shyps flag is gone, any remaining shyps are simply
wenzelm@7986
  2145
left in the theorem (with a warning issued by strip_shyps_warning);
wenzelm@7647
  2146
wenzelm@6343
  2147
paulson@6064
  2148
wenzelm@5781
  2149
New in Isabelle98-1 (October 1998)
wenzelm@5781
  2150
----------------------------------
wenzelm@5781
  2151
wenzelm@5127
  2152
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4842
  2153
wenzelm@5726
  2154
* several changes of automated proof tools;
wenzelm@5373
  2155
wenzelm@5726
  2156
* HOL: major changes to the inductive and datatype packages, including
wenzelm@5726
  2157
some minor incompatibilities of theory syntax;
berghofe@5214
  2158
wenzelm@5726
  2159
* HOL: renamed r^-1 to 'converse' from 'inverse'; 'inj_onto' is now
wenzelm@5217
  2160
called `inj_on';
paulson@5160
  2161
nipkow@5275
  2162
* HOL: removed duplicate thms in Arith:
nipkow@5275
  2163
  less_imp_add_less  should be replaced by  trans_less_add1
nipkow@5275
  2164
  le_imp_add_le      should be replaced by  trans_le_add1
paulson@5160
  2165
wenzelm@5726
  2166
* HOL: unary minus is now overloaded (new type constraints may be
wenzelm@5726
  2167
required);
paulson@5490
  2168
wenzelm@5726
  2169
* HOL and ZF: unary minus for integers is now #- instead of #~.  In
wenzelm@5726
  2170
ZF, expressions such as n#-1 must be changed to n#- 1, since #-1 is
wenzelm@5726
  2171
now taken as an integer constant.
paulson@5541
  2172
wenzelm@5726
  2173
* Pure: ML function 'theory_of' renamed to 'theory';
wenzelm@5397
  2174
wenzelm@5363
  2175
wenzelm@5127
  2176
*** Proof tools ***
nipkow@4880
  2177
nipkow@5657
  2178
* Simplifier:
nipkow@5657
  2179
  1. Asm_full_simp_tac is now more aggressive.
nipkow@5657
  2180
     1. It will sometimes reorient premises if that increases their power to
nipkow@5657
  2181
        simplify.
nipkow@5657
  2182
     2. It does no longer proceed strictly from left to right but may also
nipkow@5657
  2183
        rotate premises to achieve further simplification.
nipkow@5657
  2184
     For compatibility reasons there is now Asm_lr_simp_tac which is like the
nipkow@5657
  2185
     old Asm_full_simp_tac in that it does not rotate premises.
nipkow@5657
  2186
  2. The simplifier now knows a little bit about nat-arithmetic.
nipkow@4880
  2187
wenzelm@5127
  2188
* Classical reasoner: wrapper mechanism for the classical reasoner now
wenzelm@5127
  2189
allows for selected deletion of wrappers, by introduction of names for
wenzelm@5127
  2190
wrapper functionals.  This implies that addbefore, addSbefore,
wenzelm@5127
  2191
addaltern, and addSaltern now take a pair (name, tactic) as argument,
wenzelm@5127
  2192
and that adding two tactics with the same name overwrites the first
wenzelm@5127
  2193
one (emitting a warning).
oheimb@4824
  2194
  type wrapper = (int -> tactic) -> (int -> tactic)
oheimb@4649
  2195
  setWrapper, setSWrapper, compWrapper and compSWrapper are replaced by
oheimb@4824
  2196
  addWrapper, addSWrapper: claset * (string * wrapper) -> claset
oheimb@4824
  2197
  delWrapper, delSWrapper: claset *  string            -> claset
oheimb@4649
  2198
  getWrapper is renamed to appWrappers, getSWrapper to appSWrappers;
oheimb@4649
  2199
wenzelm@5705
  2200
* Classical reasoner: addbefore/addSbefore now have APPEND/ORELSE
wenzelm@5726
  2201
semantics; addbefore now affects only the unsafe part of step_tac
wenzelm@5726
  2202
etc.; this affects addss/auto_tac/force_tac, so EXISTING PROOFS MAY
wenzelm@5726
  2203
FAIL, but proofs should be fixable easily, e.g. by replacing Auto_tac
wenzelm@5726
  2204
by Force_tac;
oheimb@5524
  2205
wenzelm@5726
  2206
* Classical reasoner: setwrapper to setWrapper and compwrapper to
wenzelm@5726
  2207
compWrapper; added safe wrapper (and access functions for it);
oheimb@5524
  2208
wenzelm@5127
  2209
* HOL/split_all_tac is now much faster and fails if there is nothing
wenzelm@5726
  2210
to split.  Some EXISTING PROOFS MAY REQUIRE ADAPTION because the order
wenzelm@5726
  2211
and the names of the automatically generated variables have changed.
wenzelm@5726
  2212
split_all_tac has moved within claset() from unsafe wrappers to safe
wenzelm@5726
  2213
wrappers, which means that !!-bound variables are split much more
wenzelm@5726
  2214
aggressively, and safe_tac and clarify_tac now split such variables.
wenzelm@5726
  2215
If this splitting is not appropriate, use delSWrapper "split_all_tac".
wenzelm@5726
  2216
Note: the same holds for record_split_tac, which does the job of
wenzelm@5726
  2217
split_all_tac for record fields.
wenzelm@5127
  2218
wenzelm@5726
  2219
* HOL/Simplifier: Rewrite rules for case distinctions can now be added
wenzelm@5726
  2220
permanently to the default simpset using Addsplits just like
wenzelm@5726
  2221
Addsimps. They can be removed via Delsplits just like
wenzelm@5726
  2222
Delsimps. Lower-case versions are also available.
wenzelm@5127
  2223
wenzelm@5726
  2224
* HOL/Simplifier: The rule split_if is now part of the default
wenzelm@5726
  2225
simpset. This means that the simplifier will eliminate all occurrences
wenzelm@5726
  2226
of if-then-else in the conclusion of a goal. To prevent this, you can
wenzelm@5726
  2227
either remove split_if completely from the default simpset by
wenzelm@5726
  2228
`Delsplits [split_if]' or remove it in a specific call of the
wenzelm@5726
  2229
simplifier using `... delsplits [split_if]'.  You can also add/delete
wenzelm@5726
  2230
other case splitting rules to/from the default simpset: every datatype
wenzelm@5726
  2231
generates suitable rules `split_t_case' and `split_t_case_asm' (where
wenzelm@5726
  2232
t is the name of the datatype).
wenzelm@5127
  2233
wenzelm@5726
  2234
* Classical reasoner / Simplifier combination: new force_tac (and
wenzelm@5127
  2235
derivatives Force_tac, force) combines rewriting and classical
wenzelm@5127
  2236
reasoning (and whatever other tools) similarly to auto_tac, but is
wenzelm@5726
  2237
aimed to solve the given subgoal completely.
wenzelm@5127
  2238
wenzelm@5127
  2239
wenzelm@5127
  2240
*** General ***
wenzelm@5127
  2241
wenzelm@5217
  2242
* new top-level commands `Goal' and `Goalw' that improve upon `goal'
wenzelm@5127
  2243
and `goalw': the theory is no longer needed as an explicit argument -
wenzelm@5127
  2244
the current theory context is used; assumptions are no longer returned
wenzelm@5127
  2245
at the ML-level unless one of them starts with ==> or !!; it is
wenzelm@5217
  2246
recommended to convert to these new commands using isatool fixgoal
wenzelm@5217
  2247
(backup your sources first!);
wenzelm@4842
  2248
wenzelm@5217
  2249
* new top-level commands 'thm' and 'thms' for retrieving theorems from
wenzelm@5207
  2250
the current theory context, and 'theory' to lookup stored theories;
paulson@4806
  2251
paulson@5722
  2252
* new theory section 'locale' for declaring constants, assumptions and
paulson@5722
  2253
definitions that have local scope;
paulson@5722
  2254
wenzelm@5127
  2255
* new theory section 'nonterminals' for purely syntactic types;
wenzelm@4858
  2256
wenzelm@5127
  2257
* new theory section 'setup' for generic ML setup functions
wenzelm@5127
  2258
(e.g. package initialization);
wenzelm@4869
  2259
wenzelm@5131
  2260
* the distribution now includes Isabelle icons: see
wenzelm@5131
  2261
lib/logo/isabelle-{small,tiny}.xpm;
wenzelm@5131
  2262
wenzelm@5363
  2263
* isatool install - install binaries with absolute references to
wenzelm@5363
  2264
ISABELLE_HOME/bin;
wenzelm@5363
  2265
wenzelm@5572
  2266
* isatool logo -- create instances of the Isabelle logo (as EPS);
wenzelm@5572
  2267
wenzelm@5407
  2268
* print mode 'emacs' reserved for Isamode;
wenzelm@5407
  2269
wenzelm@5726
  2270
* support multiple print (ast) translations per constant name;
wenzelm@5726
  2271
wenzelm@6925
  2272
* theorems involving oracles are now printed with a suffixed [!];
wenzelm@6925
  2273
wenzelm@4711
  2274
paulson@4661
  2275
*** HOL ***
paulson@4661
  2276
wenzelm@5710
  2277
* there is now a tutorial on Isabelle/HOL (do 'isatool doc tutorial');
nipkow@5709
  2278
wenzelm@5217
  2279
* HOL/inductive package reorganized and improved: now supports mutual
paulson@5267
  2280
definitions such as
wenzelm@5217
  2281
wenzelm@5217
  2282
  inductive EVEN ODD
wenzelm@5217
  2283
    intrs
wenzelm@5217
  2284
      null "0 : EVEN"
wenzelm@5217
  2285
      oddI "n : EVEN ==> Suc n : ODD"
wenzelm@5217
  2286
      evenI "n : ODD ==> Suc n : EVEN"
wenzelm@5217
  2287
wenzelm@5217
  2288
new theorem list "elims" contains an elimination rule for each of the
wenzelm@5217
  2289
recursive sets; inductive definitions now handle disjunctive premises
wenzelm@5217
  2290
correctly (also ZF);
berghofe@5214
  2291
wenzelm@5217
  2292
INCOMPATIBILITIES: requires Inductive as an ancestor; component
wenzelm@5217
  2293
"mutual_induct" no longer exists - the induction rule is always
wenzelm@5217
  2294
contained in "induct";
wenzelm@5217
  2295
wenzelm@5217
  2296
wenzelm@5217
  2297
* HOL/datatype package re-implemented and greatly improved: now
paulson@5267
  2298
supports mutually recursive datatypes such as
wenzelm@5217
  2299
wenzelm@5217
  2300
  datatype
wenzelm@5217
  2301
    'a aexp = IF_THEN_ELSE ('a bexp) ('a aexp) ('a aexp)
wenzelm@5217
  2302
            | SUM ('a aexp) ('a aexp)
wenzelm@5217
  2303
            | DIFF ('a aexp) ('a aexp)
wenzelm@5217
  2304
            | NUM 'a
wenzelm@5217
  2305
  and
wenzelm@5217
  2306
    'a bexp = LESS ('a aexp) ('a aexp)
wenzelm@5217
  2307
            | AND ('a bexp) ('a bexp)
wenzelm@5217
  2308
            | OR ('a bexp) ('a bexp)
wenzelm@5217
  2309
paulson@5267
  2310
as well as indirectly recursive datatypes such as
berghofe@5214
  2311
wenzelm@5217
  2312
  datatype
wenzelm@5217
  2313
    ('a, 'b) term = Var 'a
wenzelm@5217
  2314
                  | App 'b ((('a, 'b) term) list)
berghofe@5214
  2315
wenzelm@5217
  2316
The new tactic  mutual_induct_tac [<var_1>, ..., <var_n>] i  performs
wenzelm@5217
  2317
induction on mutually / indirectly recursive datatypes.
wenzelm@5217
  2318
wenzelm@5217
  2319
Primrec equations are now stored in theory and can be accessed via
wenzelm@5217
  2320
<function_name>.simps.
wenzelm@5217
  2321
wenzelm@5217
  2322
INCOMPATIBILITIES:
berghofe@5214
  2323
wenzelm@5217
  2324
  - Theories using datatypes must now have theory Datatype as an
wenzelm@5217
  2325
    ancestor.
wenzelm@5217
  2326
  - The specific <typename>.induct_tac no longer exists - use the
wenzelm@5217
  2327
    generic induct_tac instead.
berghofe@5226
  2328
  - natE has been renamed to nat.exhaust - use exhaust_tac
wenzelm@5217
  2329
    instead of res_inst_tac ... natE. Note that the variable
berghofe@5226
  2330
    names in nat.exhaust differ from the names in natE, this
wenzelm@5217
  2331
    may cause some "fragile" proofs to fail.
wenzelm@5217
  2332
  - The theorems split_<typename>_case and split_<typename>_case_asm
wenzelm@5217
  2333
    have been renamed to <typename>.split and <typename>.split_asm.
wenzelm@5217
  2334
  - Since default sorts of type variables are now handled correctly,
wenzelm@5217
  2335
    some datatype definitions may have to be annotated with explicit
wenzelm@5217
  2336
    sort constraints.
wenzelm@5217
  2337
  - Primrec definitions no longer require function name and type
wenzelm@5217
  2338
    of recursive argument.
berghofe@5214
  2339
wenzelm@5217
  2340
Consider using isatool fixdatatype to adapt your theories and proof
wenzelm@5217
  2341
scripts to the new package (backup your sources first!).
wenzelm@5217
  2342
wenzelm@5217
  2343
wenzelm@5726
  2344
* HOL/record package: considerably improved implementation; now
wenzelm@5726
  2345
includes concrete syntax for record types, terms, updates; theorems
wenzelm@5726
  2346
for surjective pairing and splitting !!-bound record variables; proof
wenzelm@5726
  2347
support is as follows:
wenzelm@5726
  2348
wenzelm@5726
  2349
  1) standard conversions (selectors or updates applied to record
wenzelm@5726
  2350
constructor terms) are part of the standard simpset;
wenzelm@5726
  2351
wenzelm@5726
  2352
  2) inject equations of the form ((x, y) = (x', y')) == x=x' & y=y' are
wenzelm@5726
  2353
made part of standard simpset and claset via addIffs;
wenzelm@5726
  2354
wenzelm@5726
  2355
  3) a tactic for record field splitting (record_split_tac) is part of
wenzelm@5726
  2356
the standard claset (addSWrapper);
wenzelm@5726
  2357
wenzelm@5726
  2358
To get a better idea about these rules you may retrieve them via
wenzelm@5726
  2359
something like 'thms "foo.simps"' or 'thms "foo.iffs"', where "foo" is
wenzelm@5726
  2360
the name of your record type.
wenzelm@5726
  2361
wenzelm@5726
  2362
The split tactic 3) conceptually simplifies by the following rule:
wenzelm@5726
  2363
wenzelm@5726
  2364
  "(!!x. PROP ?P x) == (!!a b. PROP ?P (a, b))"
wenzelm@5726
  2365
wenzelm@5726
  2366
Thus any record variable that is bound by meta-all will automatically
wenzelm@5726
  2367
blow up into some record constructor term, consequently the
wenzelm@5726
  2368
simplifications of 1), 2) apply.  Thus force_tac, auto_tac etc. shall
wenzelm@5726
  2369
solve record problems automatically.
wenzelm@5726
  2370
berghofe@5214
  2371
wenzelm@5125
  2372
* reorganized the main HOL image: HOL/Integ and String loaded by
wenzelm@5125
  2373
default; theory Main includes everything;
wenzelm@5125
  2374
paulson@5650
  2375
* automatic simplification of integer sums and comparisons, using cancellation;
paulson@5650
  2376
oheimb@5526
  2377
* added option_map_eq_Some and not_Some_eq to the default simpset and claset;
wenzelm@5127
  2378
wenzelm@5127
  2379
* added disj_not1 = "(~P | Q) = (P --> Q)" to the default simpset;
wenzelm@5127
  2380
wenzelm@5127
  2381
* many new identities for unions, intersections, set difference, etc.;
wenzelm@5127
  2382
wenzelm@5127
  2383
* expand_if, expand_split, expand_sum_case and expand_nat_case are now
wenzelm@5127
  2384
called split_if, split_split, split_sum_case and split_nat_case (to go
wenzelm@5127
  2385
with add/delsplits);
wenzelm@5125
  2386
wenzelm@5127
  2387
* HOL/Prod introduces simplification procedure unit_eq_proc rewriting
wenzelm@5127
  2388
(?x::unit) = (); this is made part of the default simpset, which COULD
wenzelm@5127
  2389
MAKE EXISTING PROOFS FAIL under rare circumstances (consider
wenzelm@5207
  2390
'Delsimprocs [unit_eq_proc];' as last resort); also note that
wenzelm@5207
  2391
unit_abs_eta_conv is added in order to counter the effect of
wenzelm@5207
  2392
unit_eq_proc on (%u::unit. f u), replacing it by f rather than by
wenzelm@5207
  2393
%u.f();
wenzelm@5125
  2394
wenzelm@5217
  2395
* HOL/Fun INCOMPATIBILITY: `inj_onto' is now called `inj_on' (which
wenzelm@5217
  2396
makes more sense);
berghofe@5109
  2397
paulson@5475
  2398
* HOL/Set INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
  2399
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
  2400
  disjointness reasoning but breaking a few old proofs.
paulson@5267
  2401
wenzelm@5217
  2402
* HOL/Relation INCOMPATIBILITY: renamed the relational operator r^-1
wenzelm@5217
  2403
to 'converse' from 'inverse' (for compatibility with ZF and some
wenzelm@5217
  2404
literature);
wenzelm@5085
  2405
wenzelm@5127
  2406
* HOL/recdef can now declare non-recursive functions, with {} supplied as
wenzelm@5127
  2407
the well-founded relation;
oheimb@4838
  2408
paulson@5490
  2409
* HOL/Set INCOMPATIBILITY: the complement of set A is now written -A instead of
paulson@5490
  2410
    Compl A.  The "Compl" syntax remains available as input syntax for this
paulson@5490
  2411
    release ONLY.
paulson@5490
  2412
wenzelm@5127
  2413
* HOL/Update: new theory of function updates:
wenzelm@5127
  2414
    f(a:=b) == %x. if x=a then b else f x
wenzelm@5127
  2415
may also be iterated as in f(a:=b,c:=d,...);
nipkow@5077
  2416
wenzelm@5127
  2417
* HOL/Vimage: new theory for inverse image of a function, syntax f-``B;
paulson@4899
  2418
nipkow@5282
  2419
* HOL/List:
nipkow@5282
  2420
  - new function list_update written xs[i:=v] that updates the i-th
nipkow@5282
  2421
    list position. May also be iterated as in xs[i:=a,j:=b,...].
nipkow@5428
  2422
  - new function `upt' written [i..j(] which generates the list
nipkow@5428
  2423
    [i,i+1,...,j-1], i.e. the upper bound is excluded. To include the upper
nipkow@5428
  2424
    bound write [i..j], which is a shorthand for [i..j+1(].
nipkow@5282
  2425
  - new lexicographic orderings and corresponding wellfoundedness theorems.
paulson@4779
  2426
wenzelm@5127
  2427
* HOL/Arith:
wenzelm@5127
  2428
  - removed 'pred' (predecessor) function;
wenzelm@5127
  2429
  - generalized some theorems about n-1;
wenzelm@5127
  2430
  - many new laws about "div" and "mod";
wenzelm@5127
  2431
  - new laws about greatest common divisors (see theory ex/Primes);
oheimb@4766
  2432
wenzelm@5127
  2433
* HOL/Relation: renamed the relational operator r^-1 "converse"
wenzelm@4842
  2434
instead of "inverse";
wenzelm@4711
  2435
nipkow@5651
  2436
* HOL/Induct/Multiset: a theory of multisets, including the wellfoundedness
nipkow@5651
  2437
  of the multiset ordering;
nipkow@5651
  2438
wenzelm@5127
  2439
* directory HOL/Real: a construction of the reals using Dedekind cuts
nipkow@5651
  2440
  (not included by default);
nipkow@4835
  2441
wenzelm@5127
  2442
* directory HOL/UNITY: Chandy and Misra's UNITY formalism;
wenzelm@4711
  2443
nipkow@5651
  2444
* directory HOL/Hoare: a new version of Hoare logic which permits many-sorted
nipkow@5651
  2445
  programs, i.e. different program variables may have different types.
nipkow@5651
  2446
paulson@5142
  2447
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
  2448
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
  2449
  Now rew can involve either definitions or equalities (either == or =).
wenzelm@5002
  2450
wenzelm@5363
  2451
paulson@4879
  2452
*** ZF ***
paulson@4879
  2453
paulson@5332
  2454
* theory Main includes everything; INCOMPATIBILITY: theory ZF.thy contains
paulson@5332
  2455
  only the theorems proved on ZF.ML;
paulson@5160
  2456
paulson@5475
  2457
* ZF INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
  2458
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
  2459
  disjointness reasoning but breaking a few old proofs.
paulson@5267
  2460
paulson@5160
  2461
* ZF/Update: new theory of function updates
paulson@5160
  2462
    with default rewrite rule  f(x:=y) ` z = if(z=x, y, f`z)
paulson@5160
  2463
  may also be iterated as in f(a:=b,c:=d,...);
paulson@5160
  2464
paulson@4879
  2465
* in  let x=t in u(x), neither t nor u(x) has to be an FOL term.
oheimb@4649
  2466
paulson@5142
  2467
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
  2468
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
  2469
  Now rew can involve either definitions or equalities (either == or =).
paulson@5142
  2470
paulson@5160
  2471
* case_tac provided for compatibility with HOL
paulson@5160
  2472
    (like the old excluded_middle_tac, but with subgoals swapped)
paulson@5160
  2473
wenzelm@4842
  2474
wenzelm@5127
  2475
*** Internal programming interfaces ***
wenzelm@5002
  2476
wenzelm@5251
  2477
* Pure: several new basic modules made available for general use, see
wenzelm@5251
  2478
also src/Pure/README;
wenzelm@5207
  2479
wenzelm@5008
  2480
* improved the theory data mechanism to support encapsulation (data
wenzelm@5008
  2481
kind name replaced by private Object.kind, acting as authorization
wenzelm@5373
  2482
key); new type-safe user interface via functor TheoryDataFun; generic
wenzelm@5373
  2483
print_data function becomes basically useless;
wenzelm@5002
  2484
wenzelm@5251
  2485
* removed global_names compatibility flag -- all theory declarations
wenzelm@5251
  2486
are qualified by default;
wenzelm@5251
  2487
wenzelm@5085
  2488
* module Pure/Syntax now offers quote / antiquote translation
wenzelm@5085
  2489
functions (useful for Hoare logic etc. with implicit dependencies);
wenzelm@5373
  2490
see HOL/ex/Antiquote for an example use;
wenzelm@5085
  2491
wenzelm@5127
  2492
* Simplifier now offers conversions (asm_)(full_)rewrite: simpset ->
wenzelm@5127
  2493
cterm -> thm;
wenzelm@5127
  2494
wenzelm@5207
  2495
* new tactical CHANGED_GOAL for checking that a tactic modifies a
wenzelm@5207
  2496
subgoal;
paulson@5142
  2497
wenzelm@5251
  2498
* Display.print_goals function moved to Locale.print_goals;
wenzelm@5251
  2499
wenzelm@5731
  2500
* standard print function for goals supports current_goals_markers
wenzelm@5731
  2501
variable for marking begin of proof, end of proof, start of goal; the
wenzelm@5731
  2502
default is ("", "", ""); setting current_goals_markers := ("<proof>",
wenzelm@5731
  2503
"</proof>", "<goal>") causes SGML like tagged proof state printing,
wenzelm@5731
  2504
for example;
wenzelm@5731
  2505
wenzelm@5002
  2506
wenzelm@5002
  2507
wenzelm@4410
  2508
New in Isabelle98 (January 1998)
wenzelm@4410
  2509
--------------------------------
wenzelm@4410
  2510
wenzelm@4410
  2511
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4410
  2512
wenzelm@4410
  2513
* changed lexical syntax of terms / types: dots made part of long
wenzelm@4410
  2514
identifiers, e.g. "%x.x" no longer possible, should be "%x. x";
wenzelm@4410
  2515
wenzelm@4410
  2516
* simpset (and claset) reference variable replaced by functions
wenzelm@4410
  2517
simpset / simpset_ref;
wenzelm@4410
  2518
wenzelm@4410
  2519
* no longer supports theory aliases (via merge) and non-trivial
wenzelm@4410
  2520
implicit merge of thms' signatures;
wenzelm@4410
  2521
wenzelm@4410
  2522
* most internal names of constants changed due to qualified names;
wenzelm@4410
  2523
wenzelm@4410
  2524
* changed Pure/Sequence interface (see Pure/seq.ML);
wenzelm@4410
  2525
wenzelm@3454
  2526
paulson@3715
  2527
*** General Changes ***
paulson@3715
  2528
wenzelm@4174
  2529
* hierachically structured name spaces (for consts, types, axms, thms
wenzelm@3943
  2530
etc.); new lexical class 'longid' (e.g. Foo.bar.x) may render much of
wenzelm@4108
  2531
old input syntactically incorrect (e.g. "%x.x"); COMPATIBILITY:
wenzelm@4108
  2532
isatool fixdots ensures space after dots (e.g. "%x. x"); set
wenzelm@4174
  2533
long_names for fully qualified output names; NOTE: ML programs
wenzelm@4174
  2534
(special tactics, packages etc.) referring to internal names may have
wenzelm@4174
  2535
to be adapted to cope with fully qualified names; in case of severe
wenzelm@4174
  2536
backward campatibility problems try setting 'global_names' at compile
wenzelm@4174
  2537
time to have enrything declared within a flat name space; one may also
wenzelm@4174
  2538
fine tune name declarations in theories via the 'global' and 'local'
wenzelm@4174
  2539
section;
wenzelm@4108
  2540
wenzelm@4108
  2541
* reimplemented the implicit simpset and claset using the new anytype
wenzelm@4108
  2542
data filed in signatures; references simpset:simpset ref etc. are
wenzelm@4108
  2543
replaced by functions simpset:unit->simpset and
wenzelm@4108
  2544
simpset_ref:unit->simpset ref; COMPATIBILITY: use isatool fixclasimp
wenzelm@4108
  2545
to patch your ML files accordingly;
paulson@3856
  2546
wenzelm@3857
  2547
* HTML output now includes theory graph data for display with Java
wenzelm@3857
  2548
applet or isatool browser; data generated automatically via isatool
wenzelm@3901
  2549
usedir (see -i option, ISABELLE_USEDIR_OPTIONS);
wenzelm@3857
  2550
paulson@3856
  2551
* defs may now be conditional; improved rewrite_goals_tac to handle
paulson@3856
  2552
conditional equations;
paulson@3856
  2553
wenzelm@4174
  2554
* defs now admits additional type arguments, using TYPE('a) syntax;
wenzelm@4174
  2555
wenzelm@3901
  2556
* theory aliases via merge (e.g. M=A+B+C) no longer supported, always
wenzelm@3901
  2557
creates a new theory node; implicit merge of thms' signatures is
wenzelm@4112
  2558
restricted to 'trivial' ones; COMPATIBILITY: one may have to use
wenzelm@3901
  2559
transfer:theory->thm->thm in (rare) cases;
wenzelm@3901
  2560
wenzelm@3968
  2561
* improved handling of draft signatures / theories; draft thms (and
wenzelm@3968
  2562
ctyps, cterms) are automatically promoted to real ones;
wenzelm@3968
  2563
wenzelm@3901
  2564
* slightly changed interfaces for oracles: admit many per theory, named
wenzelm@3901
  2565
(e.g. oracle foo = mlfun), additional name argument for invoke_oracle;
wenzelm@3901
  2566
wenzelm@3901
  2567
* print_goals: optional output of const types (set show_consts and
wenzelm@3901
  2568
show_types);
wenzelm@3851
  2569
wenzelm@4388
  2570
* improved output of warnings (###) and errors (***);
wenzelm@3697
  2571
paulson@4178
  2572
* subgoal_tac displays a warning if the new subgoal has type variables;
paulson@4178
  2573
paulson@3715
  2574
* removed old README and Makefiles;
wenzelm@3697
  2575
paulson@3856
  2576
* replaced print_goals_ref hook by print_current_goals_fn and result_error_fn;
wenzelm@3670
  2577
paulson@3715
  2578
* removed obsolete init_pps and init_database;
paulson@3715
  2579
paulson@3715
  2580
* deleted the obsolete tactical STATE, which was declared by
paulson@3715
  2581
    fun STATE tacfun st = tacfun st st;
paulson@3715
  2582
wenzelm@4388
  2583
* cd and use now support path variables, e.g. $ISABELLE_HOME, or ~
wenzelm@4388
  2584
(which abbreviates $HOME);
wenzelm@4269
  2585
wenzelm@4269
  2586
* changed Pure/Sequence interface (see Pure/seq.ML); COMPATIBILITY:
wenzelm@4269
  2587
use isatool fixseq to adapt your ML programs (this works for fully
wenzelm@4269
  2588
qualified references to the Sequence structure only!);
wenzelm@4269
  2589
wenzelm@4381
  2590
* use_thy no longer requires writable current directory; it always
wenzelm@4381
  2591
reloads .ML *and* .thy file, if either one is out of date;
wenzelm@4269
  2592
paulson@3715
  2593
paulson@3715
  2594
*** Classical Reasoner ***
paulson@3715
  2595
wenzelm@3744
  2596
* Clarify_tac, clarify_tac, clarify_step_tac, Clarify_step_tac: new
wenzelm@3744
  2597
tactics that use classical reasoning to simplify a subgoal without
wenzelm@3744
  2598
splitting it into several subgoals;
paulson@3715
  2599
paulson@3719
  2600
* Safe_tac: like safe_tac but uses the default claset;
paulson@3719
  2601
paulson@3715
  2602
paulson@3715
  2603
*** Simplifier ***
paulson@3715
  2604
paulson@3715
  2605
* added simplification meta rules:
paulson@3715
  2606
    (asm_)(full_)simplify: simpset -> thm -> thm;
paulson@3715
  2607
paulson@3715
  2608
* simplifier.ML no longer part of Pure -- has to be loaded by object
paulson@3715
  2609
logics (again);
paulson@3715
  2610
paulson@3715
  2611
* added prems argument to simplification procedures;
paulson@3715
  2612
paulson@4325
  2613
* HOL, FOL, ZF: added infix function `addsplits':
paulson@4325
  2614
  instead of `<simpset> setloop (split_tac <thms>)'
paulson@4325
  2615
  you can simply write `<simpset> addsplits <thms>'
paulson@4325
  2616
paulson@3715
  2617
paulson@3715
  2618
*** Syntax ***
paulson@3715
  2619
wenzelm@4174
  2620
* TYPE('a) syntax for type reflection terms;
wenzelm@4174
  2621
wenzelm@3985
  2622
* no longer handles consts with name "" -- declare as 'syntax' instead;
paulson@3856
  2623
paulson@3856
  2624
* pretty printer: changed order of mixfix annotation preference (again!);
wenzelm@3846
  2625
paulson@3715
  2626
* Pure: fixed idt/idts vs. pttrn/pttrns syntactic categories;
paulson@3715
  2627
paulson@3715
  2628
paulson@3715
  2629
*** HOL ***
paulson@3715
  2630
wenzelm@5726
  2631
* HOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  2632
  with `addloop' of the simplifier to faciliate case splitting in premises.