NEWS
author wenzelm
Tue May 17 18:10:31 2005 +0200 (2005-05-17)
changeset 15979 c81578ac2d31
parent 15973 5fd94d84470f
child 16000 786c5f838b0c
permissions -rw-r--r--
tuned;
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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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* 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_question_marks controls printing of leading
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  question marks in schematic variable names.
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* Pure: new version of thms_containing that searches for a list 
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  of patterns instead of a list of constants. Available in 
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  ProofGeneral under ProofGeneral -> Find Theorems or C-c C-f. 
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  Example search: "(_::nat) + _ + _"   "_ ==> _"
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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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* Pure: reorganized bootstrapping of the Pure theories; CPure is now
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  derived from Pure, which contains all common declarations already.
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  Both theories are defined via plain Isabelle/Isar .thy files.
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  INCOMPATIBILITY: elements of CPure (such as the CPure.intro /
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  CPure.elim / CPure.dest attributes) now appear in the Pure name
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  space; use isatool fixcpure to adapt your theory and ML sources.
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*** Document preparation ***
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* Several new antiquotation:
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  @{term_type term} prints a term with its type annotated;
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  @{typeof term} prints the type of a term;
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  @{const const} is the same as @{term const}, but checks
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    that the argument is a known logical constant;
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  @{term_style style term} and @{thm_style style thm} print a term or
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    theorem applying a "style" to it
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  Predefined styles are "lhs" and "rhs" printing the lhs/rhs of
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  definitions, equations, inequations etc. and "conclusion" printing
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  only the conclusion of a meta-logical statement theorem.  Styles may
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  be defined via TermStyle.add_style in ML.  See the "LaTeX Sugar"
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  document for more information.
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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.  The x-symbol for >=
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  is \<ge>.
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* HOL/Set: "{x:A. P}" abbreviates "{x. x:A & P}" (and similarly for
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  "\<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).
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* ZF/Simplifier: install second copy of type solver that actually
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  makes use of TC rules declared to Isar proof contexts (or locales);
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  the old version is still required for ML proof scripts.
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*** System ***
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* Allow symlinks to all proper Isabelle executables (Isabelle,
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  isabelle, isatool etc.).
wenzelm@15852
   334
wenzelm@15852
   335
* isabelle-process: Poly/ML no longer needs Perl to run an interactive
wenzelm@15852
   336
  session.
wenzelm@15852
   337
wenzelm@15852
   338
* ISABELLE_DOC_FORMAT setting specifies preferred document format (for
wenzelm@15852
   339
  isatool doc, isatool mkdir, display_drafts etc.).
wenzelm@15703
   340
wenzelm@15703
   341
* isatool usedir: option -f allows specification of the ML file to be
wenzelm@15703
   342
  used by Isabelle; default is ROOT.ML.
wenzelm@15703
   343
wenzelm@15852
   344
* HOL: isatool dimacs2hol converts files in DIMACS CNF format
wenzelm@15852
   345
  (containing Boolean satisfiability problems) into Isabelle/HOL
wenzelm@15852
   346
  theories.
wenzelm@15703
   347
wenzelm@15703
   348
wenzelm@15703
   349
*** ML ***
wenzelm@15703
   350
wenzelm@15973
   351
* Pure/library.ML no longer defines its own option datatype, but uses
wenzelm@15973
   352
  that of the SML basis, which has constructors NONE and SOME instead
wenzelm@15973
   353
  of None and Some, as well as exception Option.Option instead of
wenzelm@15973
   354
  OPTION.  The functions the, if_none, is_some, is_none have been
wenzelm@15973
   355
  adapted accordingly, while Option.map replaces apsome.
wenzelm@15973
   356
wenzelm@15973
   357
* The exception LIST is no more, the standard exceptions Empty and
wenzelm@15973
   358
  Subscript, as well as Library.UnequalLengths are used instead.  This
wenzelm@15973
   359
  means that function like Library.hd and Library.tl are gone, as the
wenzelm@15973
   360
  standard hd and tl functions suffice.
wenzelm@15973
   361
wenzelm@15973
   362
  A number of basic functions are now no longer exported to the ML
wenzelm@15973
   363
  toplevel, as they are variants of standard functions.  The following
wenzelm@15973
   364
  suggests how one can translate existing code:
wenzelm@15973
   365
wenzelm@15973
   366
    rev_append xs ys = List.revAppend (xs, ys)
wenzelm@15973
   367
    nth_elem (i, xs) = List.nth (xs, i)
wenzelm@15973
   368
    last_elem xs = List.last xs
wenzelm@15973
   369
    flat xss = List.concat xss
wenzelm@15973
   370
    seq fs = app fs
wenzelm@15973
   371
    partition P xs = List.partition P xs
wenzelm@15973
   372
    filter P xs = List.filter P xs
wenzelm@15973
   373
    mapfilter f xs = List.mapPartial f xs
wenzelm@15973
   374
wenzelm@15703
   375
* Pure: output via the Isabelle channels of writeln/warning/error
wenzelm@15703
   376
  etc. is now passed through Output.output, with a hook for arbitrary
wenzelm@15703
   377
  transformations depending on the print_mode (cf. Output.add_mode --
wenzelm@15703
   378
  the first active mode that provides a output function wins).
wenzelm@15703
   379
  Already formatted output may be embedded into further text via
wenzelm@15703
   380
  Output.raw; the result of Pretty.string_of/str_of and derived
wenzelm@15703
   381
  functions (string_of_term/cterm/thm etc.) is already marked raw to
wenzelm@15703
   382
  accommodate easy composition of diagnostic messages etc.
wenzelm@15703
   383
  Programmers rarely need to care about Output.output or Output.raw at
wenzelm@15703
   384
  all, with some notable exceptions: Output.output is required when
wenzelm@15703
   385
  bypassing the standard channels (writeln etc.), or in token
wenzelm@15703
   386
  translations to produce properly formatted results; Output.raw is
wenzelm@15703
   387
  required when capturing already output material that will eventually
wenzelm@15703
   388
  be presented to the user a second time.  For the default print mode,
wenzelm@15703
   389
  both Output.output and Output.raw have no effect.
wenzelm@15703
   390
wenzelm@15703
   391
* Provers: Simplifier and Classical Reasoner now support proof context
wenzelm@15703
   392
  dependent plug-ins (simprocs, solvers, wrappers etc.).  These extra
wenzelm@15703
   393
  components are stored in the theory and patched into the
wenzelm@15703
   394
  simpset/claset when used in an Isar proof context.  Context
wenzelm@15703
   395
  dependent components are maintained by the following theory
wenzelm@15703
   396
  operations:
wenzelm@15703
   397
wenzelm@15703
   398
    Simplifier.add_context_simprocs
wenzelm@15703
   399
    Simplifier.del_context_simprocs
wenzelm@15703
   400
    Simplifier.set_context_subgoaler
wenzelm@15703
   401
    Simplifier.reset_context_subgoaler
wenzelm@15703
   402
    Simplifier.add_context_looper
wenzelm@15703
   403
    Simplifier.del_context_looper
wenzelm@15703
   404
    Simplifier.add_context_unsafe_solver
wenzelm@15703
   405
    Simplifier.add_context_safe_solver
wenzelm@15703
   406
wenzelm@15703
   407
    Classical.add_context_safe_wrapper
wenzelm@15703
   408
    Classical.del_context_safe_wrapper
wenzelm@15703
   409
    Classical.add_context_unsafe_wrapper
wenzelm@15703
   410
    Classical.del_context_unsafe_wrapper
wenzelm@15703
   411
wenzelm@15703
   412
  IMPORTANT NOTE: proof tools (methods etc.) need to use
wenzelm@15703
   413
  local_simpset_of and local_claset_of to instead of the primitive
wenzelm@15703
   414
  Simplifier.get_local_simpset and Classical.get_local_claset,
wenzelm@15703
   415
  respectively, in order to see the context dependent fields!
wenzelm@15703
   416
wenzelm@15703
   417
wenzelm@14655
   418
wenzelm@14606
   419
New in Isabelle2004 (April 2004)
wenzelm@14606
   420
--------------------------------
wenzelm@13280
   421
skalberg@14171
   422
*** General ***
skalberg@14171
   423
ballarin@14398
   424
* Provers/order.ML:  new efficient reasoner for partial and linear orders.
ballarin@14398
   425
  Replaces linorder.ML.
ballarin@14398
   426
wenzelm@14606
   427
* Pure: Greek letters (except small lambda, \<lambda>), as well as Gothic
wenzelm@14606
   428
  (\<aa>...\<zz>\<AA>...\<ZZ>), calligraphic (\<A>...\<Z>), and Euler
skalberg@14173
   429
  (\<a>...\<z>), are now considered normal letters, and can therefore
skalberg@14173
   430
  be used anywhere where an ASCII letter (a...zA...Z) has until
skalberg@14173
   431
  now. COMPATIBILITY: This obviously changes the parsing of some
skalberg@14173
   432
  terms, especially where a symbol has been used as a binder, say
skalberg@14173
   433
  '\<Pi>x. ...', which is now a type error since \<Pi>x will be parsed
skalberg@14173
   434
  as an identifier.  Fix it by inserting a space around former
skalberg@14173
   435
  symbols.  Call 'isatool fixgreek' to try to fix parsing errors in
skalberg@14173
   436
  existing theory and ML files.
skalberg@14171
   437
paulson@14237
   438
* Pure: Macintosh and Windows line-breaks are now allowed in theory files.
paulson@14237
   439
wenzelm@14731
   440
* Pure: single letter sub/superscripts (\<^isub> and \<^isup>) are now
wenzelm@14731
   441
  allowed in identifiers. Similar to Greek letters \<^isub> is now considered
wenzelm@14731
   442
  a normal (but invisible) letter. For multiple letter subscripts repeat
wenzelm@14731
   443
  \<^isub> like this: x\<^isub>1\<^isub>2.
kleing@14233
   444
kleing@14333
   445
* Pure: There are now sub-/superscripts that can span more than one
kleing@14333
   446
  character. Text between \<^bsub> and \<^esub> is set in subscript in
wenzelm@14606
   447
  ProofGeneral and LaTeX, text between \<^bsup> and \<^esup> in
wenzelm@14606
   448
  superscript. The new control characters are not identifier parts.
kleing@14333
   449
schirmer@14561
   450
* Pure: Control-symbols of the form \<^raw:...> will literally print the
wenzelm@14606
   451
  content of "..." to the latex file instead of \isacntrl... . The "..."
wenzelm@14606
   452
  may consist of any printable characters excluding the end bracket >.
schirmer@14361
   453
paulson@14237
   454
* Pure: Using new Isar command "finalconsts" (or the ML functions
paulson@14237
   455
  Theory.add_finals or Theory.add_finals_i) it is now possible to
paulson@14237
   456
  declare constants "final", which prevents their being given a definition
paulson@14237
   457
  later.  It is useful for constants whose behaviour is fixed axiomatically
skalberg@14224
   458
  rather than definitionally, such as the meta-logic connectives.
skalberg@14224
   459
wenzelm@14606
   460
* Pure: 'instance' now handles general arities with general sorts
wenzelm@14606
   461
  (i.e. intersections of classes),
skalberg@14503
   462
kleing@14547
   463
* Presentation: generated HTML now uses a CSS style sheet to make layout
wenzelm@14731
   464
  (somewhat) independent of content. It is copied from lib/html/isabelle.css.
kleing@14547
   465
  It can be changed to alter the colors/layout of generated pages.
kleing@14547
   466
wenzelm@14556
   467
ballarin@14175
   468
*** Isar ***
ballarin@14175
   469
ballarin@14508
   470
* Tactic emulation methods rule_tac, erule_tac, drule_tac, frule_tac,
ballarin@14508
   471
  cut_tac, subgoal_tac and thin_tac:
ballarin@14175
   472
  - Now understand static (Isar) contexts.  As a consequence, users of Isar
ballarin@14175
   473
    locales are no longer forced to write Isar proof scripts.
ballarin@14175
   474
    For details see Isar Reference Manual, paragraph 4.3.2: Further tactic
ballarin@14175
   475
    emulations.
ballarin@14175
   476
  - INCOMPATIBILITY: names of variables to be instantiated may no
ballarin@14211
   477
    longer be enclosed in quotes.  Instead, precede variable name with `?'.
ballarin@14211
   478
    This is consistent with the instantiation attribute "where".
ballarin@14211
   479
ballarin@14257
   480
* Attributes "where" and "of":
ballarin@14285
   481
  - Now take type variables of instantiated theorem into account when reading
ballarin@14285
   482
    the instantiation string.  This fixes a bug that caused instantiated
ballarin@14285
   483
    theorems to have too special types in some circumstances.
ballarin@14285
   484
  - "where" permits explicit instantiations of type variables.
ballarin@14257
   485
wenzelm@14556
   486
* Calculation commands "moreover" and "also" no longer interfere with
wenzelm@14556
   487
  current facts ("this"), admitting arbitrary combinations with "then"
wenzelm@14556
   488
  and derived forms.
kleing@14283
   489
ballarin@14211
   490
* Locales:
ballarin@14211
   491
  - Goal statements involving the context element "includes" no longer
ballarin@14211
   492
    generate theorems with internal delta predicates (those ending on
ballarin@14211
   493
    "_axioms") in the premise.
ballarin@14211
   494
    Resolve particular premise with <locale>.intro to obtain old form.
ballarin@14211
   495
  - Fixed bug in type inference ("unify_frozen") that prevented mix of target
ballarin@14211
   496
    specification and "includes" elements in goal statement.
ballarin@14254
   497
  - Rule sets <locale>.intro and <locale>.axioms no longer declared as
ballarin@14254
   498
    [intro?] and [elim?] (respectively) by default.
ballarin@14508
   499
  - Experimental command for instantiation of locales in proof contexts:
ballarin@14551
   500
        instantiate <label>[<attrs>]: <loc>
ballarin@14508
   501
    Instantiates locale <loc> and adds all its theorems to the current context
ballarin@14551
   502
    taking into account their attributes.  Label and attrs are optional
ballarin@14551
   503
    modifiers, like in theorem declarations.  If present, names of
ballarin@14551
   504
    instantiated theorems are qualified with <label>, and the attributes
ballarin@14551
   505
    <attrs> are applied after any attributes these theorems might have already.
ballarin@14551
   506
      If the locale has assumptions, a chained fact of the form
ballarin@14508
   507
    "<loc> t1 ... tn" is expected from which instantiations of the parameters
ballarin@14551
   508
    are derived.  The command does not support old-style locales declared
ballarin@14551
   509
    with "locale (open)".
ballarin@14551
   510
      A few (very simple) examples can be found in FOL/ex/LocaleInst.thy.
ballarin@14175
   511
ballarin@14175
   512
* HOL: Tactic emulation methods induct_tac and case_tac understand static
ballarin@14175
   513
  (Isar) contexts.
ballarin@14175
   514
wenzelm@14556
   515
kleing@14136
   516
*** HOL ***
kleing@14136
   517
kleing@14624
   518
* Proof import: new image HOL4 contains the imported library from
kleing@14624
   519
  the HOL4 system with about 2500 theorems. It is imported by
kleing@14624
   520
  replaying proof terms produced by HOL4 in Isabelle. The HOL4 image
kleing@14624
   521
  can be used like any other Isabelle image.  See
kleing@14624
   522
  HOL/Import/HOL/README for more information.
kleing@14624
   523
ballarin@14398
   524
* Simplifier:
ballarin@14398
   525
  - Much improved handling of linear and partial orders.
ballarin@14398
   526
    Reasoners for linear and partial orders are set up for type classes
ballarin@14398
   527
    "linorder" and "order" respectively, and are added to the default simpset
ballarin@14398
   528
    as solvers.  This means that the simplifier can build transitivity chains
ballarin@14398
   529
    to solve goals from the assumptions.
ballarin@14398
   530
  - INCOMPATIBILITY: old proofs break occasionally.  Typically, applications
ballarin@14398
   531
    of blast or auto after simplification become unnecessary because the goal
ballarin@14398
   532
    is solved by simplification already.
ballarin@14398
   533
wenzelm@14731
   534
* Numerics: new theory Ring_and_Field contains over 250 basic numerical laws,
paulson@14389
   535
    all proved in axiomatic type classes for semirings, rings and fields.
paulson@14389
   536
paulson@14389
   537
* Numerics:
paulson@14389
   538
  - Numeric types (nat, int, and in HOL-Complex rat, real, complex, etc.) are
wenzelm@14731
   539
    now formalized using the Ring_and_Field theory mentioned above.
paulson@14389
   540
  - INCOMPATIBILITY: simplification and arithmetic behaves somewhat differently
paulson@14389
   541
    than before, because now they are set up once in a generic manner.
wenzelm@14731
   542
  - INCOMPATIBILITY: many type-specific arithmetic laws have gone.
paulson@14480
   543
    Look for the general versions in Ring_and_Field (and Power if they concern
paulson@14480
   544
    exponentiation).
paulson@14389
   545
paulson@14401
   546
* Type "rat" of the rational numbers is now available in HOL-Complex.
paulson@14389
   547
schirmer@14255
   548
* Records:
schirmer@14255
   549
  - Record types are now by default printed with their type abbreviation
schirmer@14255
   550
    instead of the list of all field types. This can be configured via
schirmer@14255
   551
    the reference "print_record_type_abbr".
wenzelm@14731
   552
  - Simproc "record_upd_simproc" for simplification of multiple updates added
schirmer@14255
   553
    (not enabled by default).
schirmer@14427
   554
  - Simproc "record_ex_sel_eq_simproc" to simplify EX x. sel r = x resp.
schirmer@14427
   555
    EX x. x = sel r to True (not enabled by default).
schirmer@14255
   556
  - Tactic "record_split_simp_tac" to split and simplify records added.
wenzelm@14731
   557
kleing@14136
   558
* 'specification' command added, allowing for definition by
skalberg@14224
   559
  specification.  There is also an 'ax_specification' command that
skalberg@14224
   560
  introduces the new constants axiomatically.
kleing@14136
   561
nipkow@14375
   562
* arith(_tac) is now able to generate counterexamples for reals as well.
nipkow@14375
   563
ballarin@14399
   564
* HOL-Algebra: new locale "ring" for non-commutative rings.
ballarin@14399
   565
paulson@14243
   566
* HOL-ex: InductiveInvariant_examples illustrates advanced recursive function
kleing@14610
   567
  definitions, thanks to Sava Krsti\'{c} and John Matthews.
kleing@14610
   568
wenzelm@14731
   569
* HOL-Matrix: a first theory for matrices in HOL with an application of
kleing@14610
   570
  matrix theory to linear programming.
kleing@14136
   571
nipkow@14380
   572
* Unions and Intersections:
nipkow@15119
   573
  The latex output syntax of UN and INT has been changed
nipkow@15119
   574
  from "\Union x \in A. B" to "\Union_{x \in A} B"
nipkow@15119
   575
  i.e. the index formulae has become a subscript.
nipkow@15119
   576
  Similarly for "\Union x. B", and for \Inter instead of \Union.
nipkow@14380
   577
kleing@14418
   578
* Unions and Intersections over Intervals:
wenzelm@14731
   579
  There is new short syntax "UN i<=n. A" for "UN i:{0..n}. A". There is
wenzelm@14731
   580
  also an x-symbol version with subscripts "\<Union>\<^bsub>i <= n\<^esub>. A"
kleing@14418
   581
  like in normal math, and corresponding versions for < and for intersection.
kleing@14418
   582
nipkow@15677
   583
* HOL/List: Ordering "lexico" is renamed "lenlex" and the standard
nipkow@15677
   584
  lexicographic dictonary ordering has been added as "lexord".
nipkow@15677
   585
paulson@14401
   586
* ML: the legacy theory structures Int and List have been removed. They had
paulson@14401
   587
  conflicted with ML Basis Library structures having the same names.
nipkow@14380
   588
webertj@14464
   589
* 'refute' command added to search for (finite) countermodels.  Only works
webertj@14464
   590
  for a fragment of HOL.  The installation of an external SAT solver is
webertj@14464
   591
  highly recommended.  See "HOL/Refute.thy" for details.
webertj@14464
   592
berghofe@14602
   593
* 'quickcheck' command: Allows to find counterexamples by evaluating
berghofe@14602
   594
  formulae under an assignment of free variables to random values.
berghofe@14602
   595
  In contrast to 'refute', it can deal with inductive datatypes,
berghofe@14602
   596
  but cannot handle quantifiers. See "HOL/ex/Quickcheck_Examples.thy"
berghofe@14602
   597
  for examples.
webertj@14464
   598
wenzelm@14606
   599
oheimb@14536
   600
*** HOLCF ***
oheimb@14536
   601
oheimb@14536
   602
* Streams now come with concatenation and are part of the HOLCF image
oheimb@14536
   603
wenzelm@14572
   604
wenzelm@14572
   605
kleing@14136
   606
New in Isabelle2003 (May 2003)
wenzelm@14606
   607
------------------------------
kleing@14136
   608
wenzelm@13280
   609
*** General ***
wenzelm@13280
   610
berghofe@13618
   611
* Provers/simplifier:
berghofe@13618
   612
nipkow@13781
   613
  - Completely reimplemented method simp (ML: Asm_full_simp_tac):
berghofe@13618
   614
    Assumptions are now subject to complete mutual simplification,
berghofe@13618
   615
    not just from left to right. The simplifier now preserves
berghofe@13618
   616
    the order of assumptions.
berghofe@13618
   617
berghofe@13618
   618
    Potential INCOMPATIBILITY:
berghofe@13618
   619
nipkow@13781
   620
    -- simp sometimes diverges where the old version did
nipkow@13781
   621
       not, e.g. invoking simp on the goal
berghofe@13618
   622
berghofe@13618
   623
        [| P (f x); y = x; f x = f y |] ==> Q
berghofe@13618
   624
nipkow@13781
   625
       now gives rise to the infinite reduction sequence
nipkow@13781
   626
nipkow@13781
   627
        P(f x) --(f x = f y)--> P(f y) --(y = x)--> P(f x) --(f x = f y)--> ...
nipkow@13781
   628
nipkow@13781
   629
       Using "simp (asm_lr)" (ML: Asm_lr_simp_tac) instead often solves this
nipkow@13781
   630
       kind of problem.
nipkow@13781
   631
nipkow@13781
   632
    -- Tactics combining classical reasoner and simplification (such as auto)
nipkow@13781
   633
       are also affected by this change, because many of them rely on
nipkow@13781
   634
       simp. They may sometimes diverge as well or yield a different numbers
nipkow@13781
   635
       of subgoals. Try to use e.g. force, fastsimp, or safe instead of auto
nipkow@13781
   636
       in case of problems. Sometimes subsequent calls to the classical
nipkow@13781
   637
       reasoner will fail because a preceeding call to the simplifier too
nipkow@13781
   638
       eagerly simplified the goal, e.g. deleted redundant premises.
berghofe@13618
   639
berghofe@13618
   640
  - The simplifier trace now shows the names of the applied rewrite rules
berghofe@13618
   641
nipkow@13829
   642
  - You can limit the number of recursive invocations of the simplifier
nipkow@13829
   643
    during conditional rewriting (where the simplifie tries to solve the
nipkow@13829
   644
    conditions before applying the rewrite rule):
nipkow@13829
   645
    ML "simp_depth_limit := n"
nipkow@13829
   646
    where n is an integer. Thus you can force termination where previously
nipkow@13829
   647
    the simplifier would diverge.
nipkow@13829
   648
ballarin@13835
   649
  - Accepts free variables as head terms in congruence rules.  Useful in Isar.
nipkow@13829
   650
ballarin@13938
   651
  - No longer aborts on failed congruence proof.  Instead, the
ballarin@13938
   652
    congruence is ignored.
ballarin@13938
   653
berghofe@14008
   654
* Pure: New generic framework for extracting programs from constructive
berghofe@14008
   655
  proofs. See HOL/Extraction.thy for an example instantiation, as well
berghofe@14008
   656
  as HOL/Extraction for some case studies.
berghofe@14008
   657
nipkow@13868
   658
* Pure: The main goal of the proof state is no longer shown by default, only
nipkow@13868
   659
the subgoals. This behaviour is controlled by a new flag.
ballarin@13835
   660
   PG menu: Isabelle/Isar -> Settings -> Show Main Goal
nipkow@13815
   661
(ML: Proof.show_main_goal).
nipkow@13815
   662
nipkow@13815
   663
* Pure: You can find all matching introduction rules for subgoal 1, i.e. all
nipkow@13815
   664
rules whose conclusion matches subgoal 1:
nipkow@13815
   665
      PG menu: Isabelle/Isar -> Show me -> matching rules
nipkow@13815
   666
The rules are ordered by how closely they match the subgoal.
nipkow@13815
   667
In particular, rules that solve a subgoal outright are displayed first
nipkow@13815
   668
(or rather last, the way they are printed).
nipkow@13815
   669
(ML: ProofGeneral.print_intros())
nipkow@13815
   670
nipkow@13815
   671
* Pure: New flag trace_unify_fail causes unification to print
nipkow@13781
   672
diagnostic information (PG: in trace buffer) when it fails. This is
nipkow@13781
   673
useful for figuring out why single step proofs like rule, erule or
nipkow@13781
   674
assumption failed.
nipkow@13781
   675
nipkow@13815
   676
* Pure: Locale specifications now produce predicate definitions
wenzelm@13410
   677
according to the body of text (covering assumptions modulo local
wenzelm@13410
   678
definitions); predicate "loc_axioms" covers newly introduced text,
wenzelm@13410
   679
while "loc" is cumulative wrt. all included locale expressions; the
wenzelm@13410
   680
latter view is presented only on export into the global theory
wenzelm@13410
   681
context; potential INCOMPATIBILITY, use "(open)" option to fall back
wenzelm@13410
   682
on the old view without predicates;
wenzelm@13410
   683
wenzelm@13459
   684
* Pure: predefined locales "var" and "struct" are useful for sharing
wenzelm@13459
   685
parameters (as in CASL, for example); just specify something like
wenzelm@13459
   686
``var x + var y + struct M'' as import;
wenzelm@13459
   687
wenzelm@13463
   688
* Pure: improved thms_containing: proper indexing of facts instead of
wenzelm@13463
   689
raw theorems; check validity of results wrt. current name space;
wenzelm@13463
   690
include local facts of proof configuration (also covers active
wenzelm@13541
   691
locales), cover fixed variables in index; may use "_" in term
wenzelm@13541
   692
specification; an optional limit for the number of printed facts may
wenzelm@13541
   693
be given (the default is 40);
wenzelm@13541
   694
wenzelm@13541
   695
* Pure: disallow duplicate fact bindings within new-style theory files
wenzelm@13541
   696
(batch-mode only);
wenzelm@13540
   697
wenzelm@13463
   698
* Provers: improved induct method: assumptions introduced by case
wenzelm@13463
   699
"foo" are split into "foo.hyps" (from the rule) and "foo.prems" (from
wenzelm@13463
   700
the goal statement); "foo" still refers to all facts collectively;
wenzelm@13463
   701
paulson@13550
   702
* Provers: the function blast.overloaded has been removed: all constants
paulson@13550
   703
are regarded as potentially overloaded, which improves robustness in exchange
paulson@13550
   704
for slight decrease in efficiency;
paulson@13550
   705
nipkow@13781
   706
* Provers/linorder: New generic prover for transitivity reasoning over
nipkow@13781
   707
linear orders.  Note: this prover is not efficient!
nipkow@13781
   708
wenzelm@13522
   709
* Isar: preview of problems to finish 'show' now produce an error
wenzelm@13522
   710
rather than just a warning (in interactive mode);
wenzelm@13522
   711
wenzelm@13280
   712
nipkow@13158
   713
*** HOL ***
nipkow@13158
   714
nipkow@13899
   715
* arith(_tac)
nipkow@13899
   716
nipkow@13899
   717
 - Produces a counter example if it cannot prove a goal.
nipkow@13899
   718
   Note that the counter example may be spurious if the goal is not a formula
nipkow@13899
   719
   of quantifier-free linear arithmetic.
nipkow@13899
   720
   In ProofGeneral the counter example appears in the trace buffer.
nipkow@13899
   721
nipkow@13899
   722
 - Knows about div k and mod k where k is a numeral of type nat or int.
nipkow@13899
   723
nipkow@13899
   724
 - Calls full Presburger arithmetic (by Amine Chaieb) if quantifier-free
nipkow@13899
   725
   linear arithmetic fails. This takes account of quantifiers and divisibility.
wenzelm@14731
   726
   Presburger arithmetic can also be called explicitly via presburger(_tac).
nipkow@13899
   727
nipkow@13899
   728
* simp's arithmetic capabilities have been enhanced a bit: it now
nipkow@13899
   729
takes ~= in premises into account (by performing a case split);
nipkow@13899
   730
nipkow@13899
   731
* simp reduces "m*(n div m) + n mod m" to n, even if the two summands
nipkow@13899
   732
are distributed over a sum of terms;
nipkow@13899
   733
ballarin@13735
   734
* New tactic "trans_tac" and method "trans" instantiate
ballarin@13735
   735
Provers/linorder.ML for axclasses "order" and "linorder" (predicates
wenzelm@14731
   736
"<=", "<" and "=").
wenzelm@14731
   737
wenzelm@14731
   738
* function INCOMPATIBILITIES: Pi-sets have been redefined and moved from main
paulson@13587
   739
HOL to Library/FuncSet; constant "Fun.op o" is now called "Fun.comp";
paulson@13587
   740
wenzelm@13443
   741
* 'typedef' command has new option "open" to suppress the set
wenzelm@13443
   742
definition;
wenzelm@13443
   743
wenzelm@13522
   744
* functions Min and Max on finite sets have been introduced (theory
wenzelm@13522
   745
Finite_Set);
nipkow@13492
   746
wenzelm@13443
   747
* attribute [symmetric] now works for relations as well; it turns
wenzelm@13443
   748
(x,y) : R^-1 into (y,x) : R, and vice versa;
wenzelm@13443
   749
nipkow@13613
   750
* induct over a !!-quantified statement (say !!x1..xn):
nipkow@13613
   751
  each "case" automatically performs "fix x1 .. xn" with exactly those names.
nipkow@13613
   752
nipkow@13899
   753
* Map: `empty' is no longer a constant but a syntactic abbreviation for
nipkow@13899
   754
%x. None. Warning: empty_def now refers to the previously hidden definition
nipkow@13899
   755
of the empty set.
nipkow@13899
   756
ballarin@14018
   757
* Algebra: formalization of classical algebra.  Intended as base for
ballarin@14018
   758
any algebraic development in Isabelle.  Currently covers group theory
ballarin@14018
   759
(up to Sylow's theorem) and ring theory (Universal Property of
ballarin@14018
   760
Univariate Polynomials).  Contributions welcome;
paulson@13960
   761
paulson@13960
   762
* GroupTheory: deleted, since its material has been moved to Algebra;
paulson@13960
   763
wenzelm@14731
   764
* Complex: new directory of the complex numbers with numeric constants,
wenzelm@14731
   765
nonstandard complex numbers, and some complex analysis, standard and
paulson@13966
   766
nonstandard (Jacques Fleuriot);
paulson@13966
   767
paulson@13966
   768
* HOL-Complex: new image for analysis, replacing HOL-Real and HOL-Hyperreal;
paulson@13966
   769
wenzelm@14731
   770
* Hyperreal: introduced Gauge integration and hyperreal logarithms (Jacques
paulson@13966
   771
Fleuriot);
paulson@13960
   772
wenzelm@13549
   773
* Real/HahnBanach: updated and adapted to locales;
wenzelm@13549
   774
ballarin@13995
   775
* NumberTheory: added Gauss's law of quadratic reciprocity (by Avigad,
ballarin@13995
   776
Gray and Kramer);
paulson@13872
   777
paulson@13872
   778
* UNITY: added the Meier-Sanders theory of progress sets;
paulson@13872
   779
kleing@14011
   780
* MicroJava: bytecode verifier and lightweight bytecode verifier
kleing@14011
   781
as abstract algorithms, instantiated to the JVM;
kleing@14011
   782
schirmer@14010
   783
* Bali: Java source language formalization. Type system, operational
schirmer@14010
   784
semantics, axiomatic semantics. Supported language features:
schirmer@14010
   785
classes, interfaces, objects,virtual methods, static methods,
schirmer@14010
   786
static/instance fields, arrays, access modifiers, definite
schirmer@14010
   787
assignment, exceptions.
wenzelm@13549
   788
kleing@14011
   789
wenzelm@13549
   790
*** ZF ***
wenzelm@13549
   791
webertj@15154
   792
* ZF/Constructible: consistency proof for AC (Gdel's constructible
wenzelm@13549
   793
universe, etc.);
wenzelm@13549
   794
paulson@13872
   795
* Main ZF: virtually all theories converted to new-style format;
nipkow@13518
   796
wenzelm@13280
   797
wenzelm@13478
   798
*** ML ***
wenzelm@13478
   799
wenzelm@13478
   800
* Pure: Tactic.prove provides sane interface for internal proofs;
wenzelm@13478
   801
omits the infamous "standard" operation, so this is more appropriate
wenzelm@13478
   802
than prove_goalw_cterm in many situations (e.g. in simprocs);
wenzelm@13478
   803
wenzelm@13478
   804
* Pure: improved error reporting of simprocs;
wenzelm@13478
   805
wenzelm@13478
   806
* Provers: Simplifier.simproc(_i) provides sane interface for setting
wenzelm@13478
   807
up simprocs;
wenzelm@13478
   808
wenzelm@13478
   809
kleing@13953
   810
*** Document preparation ***
kleing@13953
   811
kleing@13953
   812
* uses \par instead of \\ for line breaks in theory text. This may
kleing@13953
   813
shift some page breaks in large documents. To get the old behaviour
kleing@13953
   814
use \renewcommand{\isanewline}{\mbox{}\\\mbox{}} in root.tex.
kleing@13953
   815
wenzelm@14731
   816
* minimized dependencies of isabelle.sty and isabellesym.sty on
kleing@13953
   817
other packages
kleing@13953
   818
kleing@13953
   819
* \<euro> now needs package babel/greek instead of marvosym (which
kleing@13953
   820
broke \Rightarrow)
kleing@13953
   821
wenzelm@14731
   822
* normal size for \<zero>...\<nine> (uses \mathbf instead of
kleing@13954
   823
textcomp package)
kleing@13953
   824
wenzelm@13280
   825
wenzelm@14572
   826
wenzelm@12984
   827
New in Isabelle2002 (March 2002)
wenzelm@12984
   828
--------------------------------
wenzelm@11474
   829
wenzelm@11572
   830
*** Document preparation ***
wenzelm@11572
   831
wenzelm@11842
   832
* greatly simplified document preparation setup, including more
wenzelm@11842
   833
graceful interpretation of isatool usedir -i/-d/-D options, and more
wenzelm@11842
   834
instructive isatool mkdir; users should basically be able to get
wenzelm@12899
   835
started with "isatool mkdir HOL Test && isatool make"; alternatively,
wenzelm@12899
   836
users may run a separate document processing stage manually like this:
wenzelm@12899
   837
"isatool usedir -D output HOL Test && isatool document Test/output";
wenzelm@11842
   838
wenzelm@11842
   839
* theory dependency graph may now be incorporated into documents;
wenzelm@11842
   840
isatool usedir -g true will produce session_graph.eps/.pdf for use
wenzelm@11842
   841
with \includegraphics of LaTeX;
wenzelm@11842
   842
wenzelm@11864
   843
* proper spacing of consecutive markup elements, especially text
wenzelm@11864
   844
blocks after section headings;
wenzelm@11864
   845
wenzelm@11572
   846
* support bold style (for single symbols only), input syntax is like
wenzelm@11572
   847
this: "\<^bold>\<alpha>" or "\<^bold>A";
wenzelm@11572
   848
wenzelm@11814
   849
* \<bullet> is now output as bold \cdot by default, which looks much
wenzelm@11572
   850
better in printed text;
wenzelm@11572
   851
wenzelm@11712
   852
* added default LaTeX bindings for \<tturnstile> and \<TTurnstile>;
wenzelm@11712
   853
note that these symbols are currently unavailable in Proof General /
wenzelm@12769
   854
X-Symbol; new symbols \<zero>, \<one>, ..., \<nine>, and \<euro>;
wenzelm@12690
   855
wenzelm@12690
   856
* isatool latex no longer depends on changed TEXINPUTS, instead
wenzelm@12690
   857
isatool document copies the Isabelle style files to the target
wenzelm@12690
   858
location;
wenzelm@11712
   859
wenzelm@11572
   860
wenzelm@11633
   861
*** Isar ***
wenzelm@11633
   862
wenzelm@12312
   863
* Pure/Provers: improved proof by cases and induction;
wenzelm@12280
   864
  - 'case' command admits impromptu naming of parameters (such as
wenzelm@12280
   865
    "case (Suc n)");
wenzelm@12280
   866
  - 'induct' method divinates rule instantiation from the inductive
wenzelm@12280
   867
    claim; no longer requires excessive ?P bindings for proper
wenzelm@12280
   868
    instantiation of cases;
wenzelm@12280
   869
  - 'induct' method properly enumerates all possibilities of set/type
wenzelm@12280
   870
    rules; as a consequence facts may be also passed through *type*
wenzelm@12280
   871
    rules without further ado;
wenzelm@12280
   872
  - 'induct' method now derives symbolic cases from the *rulified*
wenzelm@12280
   873
    rule (before it used to rulify cases stemming from the internal
wenzelm@12280
   874
    atomized version); this means that the context of a non-atomic
wenzelm@12280
   875
    statement becomes is included in the hypothesis, avoiding the
wenzelm@12280
   876
    slightly cumbersome show "PROP ?case" form;
wenzelm@12280
   877
  - 'induct' may now use elim-style induction rules without chaining
wenzelm@12280
   878
    facts, using ``missing'' premises from the goal state; this allows
wenzelm@12280
   879
    rules stemming from inductive sets to be applied in unstructured
wenzelm@12280
   880
    scripts, while still benefitting from proper handling of non-atomic
wenzelm@12280
   881
    statements; NB: major inductive premises need to be put first, all
wenzelm@12280
   882
    the rest of the goal is passed through the induction;
wenzelm@12280
   883
  - 'induct' proper support for mutual induction involving non-atomic
wenzelm@12280
   884
    rule statements (uses the new concept of simultaneous goals, see
wenzelm@12280
   885
    below);
wenzelm@12853
   886
  - append all possible rule selections, but only use the first
wenzelm@12853
   887
    success (no backtracking);
wenzelm@11995
   888
  - removed obsolete "(simplified)" and "(stripped)" options of methods;
wenzelm@12754
   889
  - undeclared rule case names default to numbers 1, 2, 3, ...;
wenzelm@12754
   890
  - added 'print_induct_rules' (covered by help item in recent Proof
wenzelm@12754
   891
    General versions);
wenzelm@11995
   892
  - moved induct/cases attributes to Pure, methods to Provers;
wenzelm@11995
   893
  - generic method setup instantiated for FOL and HOL;
wenzelm@11986
   894
wenzelm@12163
   895
* Pure: support multiple simultaneous goal statements, for example
wenzelm@12163
   896
"have a: A and b: B" (same for 'theorem' etc.); being a pure
wenzelm@12163
   897
meta-level mechanism, this acts as if several individual goals had
wenzelm@12163
   898
been stated separately; in particular common proof methods need to be
wenzelm@12163
   899
repeated in order to cover all claims; note that a single elimination
wenzelm@12163
   900
step is *not* sufficient to establish the two conjunctions, so this
wenzelm@12163
   901
fails:
wenzelm@12163
   902
wenzelm@12163
   903
  assume "A & B" then have A and B ..   (*".." fails*)
wenzelm@12163
   904
wenzelm@12163
   905
better use "obtain" in situations as above; alternative refer to
wenzelm@12163
   906
multi-step methods like 'auto', 'simp_all', 'blast+' etc.;
wenzelm@12163
   907
wenzelm@12078
   908
* Pure: proper integration with ``locales''; unlike the original
webertj@15154
   909
version by Florian Kammller, Isar locales package high-level proof
wenzelm@12078
   910
contexts rather than raw logical ones (e.g. we admit to include
wenzelm@12280
   911
attributes everywhere); operations on locales include merge and
wenzelm@12964
   912
rename; support for implicit arguments (``structures''); simultaneous
wenzelm@12964
   913
type-inference over imports and text; see also HOL/ex/Locales.thy for
wenzelm@12964
   914
some examples;
wenzelm@12078
   915
wenzelm@12707
   916
* Pure: the following commands have been ``localized'', supporting a
wenzelm@12707
   917
target locale specification "(in name)": 'lemma', 'theorem',
wenzelm@12707
   918
'corollary', 'lemmas', 'theorems', 'declare'; the results will be
wenzelm@12707
   919
stored both within the locale and at the theory level (exported and
wenzelm@12707
   920
qualified by the locale name);
wenzelm@12707
   921
wenzelm@12964
   922
* Pure: theory goals may now be specified in ``long'' form, with
wenzelm@12964
   923
ad-hoc contexts consisting of arbitrary locale elements. for example
wenzelm@12964
   924
``lemma foo: fixes x assumes "A x" shows "B x"'' (local syntax and
wenzelm@12964
   925
definitions may be given, too); the result is a meta-level rule with
wenzelm@12964
   926
the context elements being discharged in the obvious way;
wenzelm@12964
   927
wenzelm@12964
   928
* Pure: new proof command 'using' allows to augment currently used
wenzelm@12964
   929
facts after a goal statement ('using' is syntactically analogous to
wenzelm@12964
   930
'apply', but acts on the goal's facts only); this allows chained facts
wenzelm@12964
   931
to be separated into parts given before and after a claim, as in
wenzelm@12964
   932
``from a and b have C using d and e <proof>'';
wenzelm@12078
   933
wenzelm@11722
   934
* Pure: renamed "antecedent" case to "rule_context";
wenzelm@11722
   935
wenzelm@12964
   936
* Pure: new 'judgment' command records explicit information about the
wenzelm@12964
   937
object-logic embedding (used by several tools internally); no longer
wenzelm@12964
   938
use hard-wired "Trueprop";
wenzelm@12964
   939
wenzelm@11738
   940
* Pure: added 'corollary' command;
wenzelm@11738
   941
wenzelm@11722
   942
* Pure: fixed 'token_translation' command;
wenzelm@11722
   943
wenzelm@11899
   944
* Pure: removed obsolete 'exported' attribute;
wenzelm@11899
   945
wenzelm@11933
   946
* Pure: dummy pattern "_" in is/let is now automatically lifted over
wenzelm@11933
   947
bound variables: "ALL x. P x --> Q x" (is "ALL x. _ --> ?C x")
wenzelm@11899
   948
supersedes more cumbersome ... (is "ALL x. _ x --> ?C x");
wenzelm@11899
   949
wenzelm@11952
   950
* Pure: method 'atomize' presents local goal premises as object-level
wenzelm@11952
   951
statements (atomic meta-level propositions); setup controlled via
wenzelm@11952
   952
rewrite rules declarations of 'atomize' attribute; example
wenzelm@11952
   953
application: 'induct' method with proper rule statements in improper
wenzelm@11952
   954
proof *scripts*;
wenzelm@11952
   955
wenzelm@12106
   956
* Pure: emulation of instantiation tactics (rule_tac, cut_tac, etc.)
wenzelm@12106
   957
now consider the syntactic context of assumptions, giving a better
wenzelm@12106
   958
chance to get type-inference of the arguments right (this is
wenzelm@12106
   959
especially important for locales);
wenzelm@12106
   960
wenzelm@12312
   961
* Pure: "sorry" no longer requires quick_and_dirty in interactive
wenzelm@12312
   962
mode;
wenzelm@12312
   963
wenzelm@12405
   964
* Pure/obtain: the formal conclusion "thesis", being marked as
wenzelm@12405
   965
``internal'', may no longer be reference directly in the text;
wenzelm@12405
   966
potential INCOMPATIBILITY, may need to use "?thesis" in rare
wenzelm@12405
   967
situations;
wenzelm@12405
   968
wenzelm@12405
   969
* Pure: generic 'sym' attribute which declares a rule both as pure
wenzelm@12405
   970
'elim?' and for the 'symmetric' operation;
wenzelm@12405
   971
wenzelm@12877
   972
* Pure: marginal comments ``--'' may now occur just anywhere in the
wenzelm@12877
   973
text; the fixed correlation with particular command syntax has been
wenzelm@12877
   974
discontinued;
wenzelm@12877
   975
berghofe@13023
   976
* Pure: new method 'rules' is particularly well-suited for proof
berghofe@13023
   977
search in intuitionistic logic; a bit slower than 'blast' or 'fast',
berghofe@13023
   978
but often produces more compact proof terms with less detours;
berghofe@13023
   979
wenzelm@12364
   980
* Pure/Provers/classical: simplified integration with pure rule
wenzelm@12364
   981
attributes and methods; the classical "intro?/elim?/dest?"
wenzelm@12364
   982
declarations coincide with the pure ones; the "rule" method no longer
wenzelm@12364
   983
includes classically swapped intros; "intro" and "elim" methods no
wenzelm@12364
   984
longer pick rules from the context; also got rid of ML declarations
wenzelm@12364
   985
AddXIs/AddXEs/AddXDs; all of this has some potential for
wenzelm@12364
   986
INCOMPATIBILITY;
wenzelm@12364
   987
wenzelm@12405
   988
* Provers/classical: attribute 'swapped' produces classical inversions
wenzelm@12405
   989
of introduction rules;
wenzelm@12405
   990
wenzelm@12364
   991
* Provers/simplifier: 'simplified' attribute may refer to explicit
wenzelm@12364
   992
rules instead of full simplifier context; 'iff' attribute handles
wenzelm@12364
   993
conditional rules;
wenzelm@11936
   994
wenzelm@11745
   995
* HOL: 'typedef' now allows alternative names for Rep/Abs morphisms;
wenzelm@11745
   996
wenzelm@11690
   997
* HOL: 'recdef' now fails on unfinished automated proofs, use
wenzelm@11633
   998
"(permissive)" option to recover old behavior;
wenzelm@11633
   999
wenzelm@11933
  1000
* HOL: 'inductive' no longer features separate (collective) attributes
wenzelm@11933
  1001
for 'intros' (was found too confusing);
wenzelm@11933
  1002
wenzelm@12405
  1003
* HOL: properly declared induction rules less_induct and
wenzelm@12405
  1004
wf_induct_rule;
wenzelm@12405
  1005
kleing@11788
  1006
wenzelm@11474
  1007
*** HOL ***
wenzelm@11474
  1008
wenzelm@11702
  1009
* HOL: moved over to sane numeral syntax; the new policy is as
wenzelm@11702
  1010
follows:
wenzelm@11702
  1011
wenzelm@11702
  1012
  - 0 and 1 are polymorphic constants, which are defined on any
wenzelm@11702
  1013
  numeric type (nat, int, real etc.);
wenzelm@11702
  1014
wenzelm@11702
  1015
  - 2, 3, 4, ... and -1, -2, -3, ... are polymorphic numerals, based
wenzelm@11702
  1016
  binary representation internally;
wenzelm@11702
  1017
wenzelm@11702
  1018
  - type nat has special constructor Suc, and generally prefers Suc 0
wenzelm@11702
  1019
  over 1::nat and Suc (Suc 0) over 2::nat;
wenzelm@11702
  1020
wenzelm@12364
  1021
This change may cause significant problems of INCOMPATIBILITY; here
wenzelm@12364
  1022
are some hints on converting existing sources:
wenzelm@11702
  1023
wenzelm@11702
  1024
  - due to the new "num" token, "-0" and "-1" etc. are now atomic
wenzelm@11702
  1025
  entities, so expressions involving "-" (unary or binary minus) need
wenzelm@11702
  1026
  to be spaced properly;
wenzelm@11702
  1027
wenzelm@11702
  1028
  - existing occurrences of "1" may need to be constraint "1::nat" or
wenzelm@11702
  1029
  even replaced by Suc 0; similar for old "2";
wenzelm@11702
  1030
wenzelm@11702
  1031
  - replace "#nnn" by "nnn", and "#-nnn" by "-nnn";
wenzelm@11702
  1032
wenzelm@11702
  1033
  - remove all special provisions on numerals in proofs;
wenzelm@11702
  1034
wenzelm@13042
  1035
* HOL: simp rules nat_number expand numerals on nat to Suc/0
wenzelm@12837
  1036
representation (depends on bin_arith_simps in the default context);
wenzelm@12837
  1037
wenzelm@12736
  1038
* HOL: symbolic syntax for x^2 (numeral 2);
wenzelm@12736
  1039
wenzelm@12335
  1040
* HOL: the class of all HOL types is now called "type" rather than
wenzelm@12335
  1041
"term"; INCOMPATIBILITY, need to adapt references to this type class
wenzelm@12335
  1042
in axclass/classes, instance/arities, and (usually rare) occurrences
wenzelm@12335
  1043
in typings (of consts etc.); internally the class is called
wenzelm@12335
  1044
"HOL.type", ML programs should refer to HOLogic.typeS;
wenzelm@12335
  1045
wenzelm@12280
  1046
* HOL/record package improvements:
wenzelm@12280
  1047
  - new derived operations "fields" to build a partial record section,
wenzelm@12280
  1048
    "extend" to promote a fixed record to a record scheme, and
wenzelm@12280
  1049
    "truncate" for the reverse; cf. theorems "xxx.defs", which are *not*
wenzelm@12280
  1050
    declared as simp by default;
wenzelm@12587
  1051
  - shared operations ("more", "fields", etc.) now need to be always
wenzelm@12587
  1052
    qualified) --- potential INCOMPATIBILITY;
wenzelm@12280
  1053
  - removed "make_scheme" operations (use "make" with "extend") --
wenzelm@12280
  1054
    INCOMPATIBILITY;
wenzelm@11937
  1055
  - removed "more" class (simply use "term") -- INCOMPATIBILITY;
wenzelm@12253
  1056
  - provides cases/induct rules for use with corresponding Isar
wenzelm@12253
  1057
    methods (for concrete records, record schemes, concrete more
wenzelm@12280
  1058
    parts, and schematic more parts -- in that order);
wenzelm@11930
  1059
  - internal definitions directly based on a light-weight abstract
wenzelm@11930
  1060
    theory of product types over typedef rather than datatype;
wenzelm@11930
  1061
berghofe@13023
  1062
* HOL: generic code generator for generating executable ML code from
berghofe@13023
  1063
specifications; specific support for HOL constructs such as inductive
berghofe@13023
  1064
datatypes and sets, as well as recursive functions; can be invoked
berghofe@13023
  1065
via 'generate_code' theory section;
berghofe@13023
  1066
wenzelm@11933
  1067
* HOL: canonical cases/induct rules for n-tuples (n = 3..7);
wenzelm@11933
  1068
paulson@13824
  1069
* HOL: consolidated and renamed several theories.  In particular:
wenzelm@14731
  1070
        Ord.thy has been absorbed into HOL.thy
wenzelm@14731
  1071
        String.thy has been absorbed into List.thy
wenzelm@14731
  1072
wenzelm@11802
  1073
* HOL: concrete setsum syntax "\<Sum>i:A. b" == "setsum (%i. b) A"
wenzelm@11802
  1074
(beware of argument permutation!);
wenzelm@11802
  1075
wenzelm@11657
  1076
* HOL: linorder_less_split superseded by linorder_cases;
wenzelm@11657
  1077
wenzelm@12917
  1078
* HOL/List: "nodups" renamed to "distinct";
nipkow@12889
  1079
wenzelm@11633
  1080
* HOL: added "The" definite description operator; move Hilbert's "Eps"
paulson@13824
  1081
to peripheral theory "Hilbert_Choice"; some INCOMPATIBILITIES:
paulson@13824
  1082
  - Ex_def has changed, now need to use some_eq_ex
wenzelm@11437
  1083
wenzelm@11572
  1084
* HOL: made split_all_tac safe; EXISTING PROOFS MAY FAIL OR LOOP, so
wenzelm@11572
  1085
in this (rare) case use:
wenzelm@11572
  1086
wenzelm@11572
  1087
  delSWrapper "split_all_tac"
wenzelm@11572
  1088
  addSbefore ("unsafe_split_all_tac", unsafe_split_all_tac)
wenzelm@11572
  1089
wenzelm@11572
  1090
* HOL: added safe wrapper "split_conv_tac" to claset; EXISTING PROOFS
wenzelm@11474
  1091
MAY FAIL;
nipkow@11361
  1092
wenzelm@11572
  1093
* HOL: introduced f^n = f o ... o f; warning: due to the limits of
wenzelm@11572
  1094
Isabelle's type classes, ^ on functions and relations has too general
wenzelm@11572
  1095
a domain, namely ('a * 'b) set and 'a => 'b; this means that it may be
wenzelm@11572
  1096
necessary to attach explicit type constraints;
nipkow@11307
  1097
wenzelm@12917
  1098
* HOL/Relation: the prefix name of the infix "O" has been changed from
wenzelm@12917
  1099
"comp" to "rel_comp"; INCOMPATIBILITY: a few theorems have been
wenzelm@12917
  1100
renamed accordingly (eg "compI" -> "rel_compI").
nipkow@12489
  1101
wenzelm@11487
  1102
* HOL: syntax translations now work properly with numerals and records
wenzelm@11487
  1103
expressions;
wenzelm@11474
  1104
wenzelm@12457
  1105
* HOL: bounded abstraction now uses syntax "%" / "\<lambda>" instead
wenzelm@12457
  1106
of "lam" -- INCOMPATIBILITY;
wenzelm@11474
  1107
wenzelm@11933
  1108
* HOL: got rid of some global declarations (potential INCOMPATIBILITY
wenzelm@11933
  1109
for ML tools): const "()" renamed "Product_Type.Unity", type "unit"
wenzelm@11933
  1110
renamed "Product_Type.unit";
wenzelm@11611
  1111
nipkow@12564
  1112
* HOL: renamed rtrancl_into_rtrancl2 to converse_rtrancl_into_rtrancl
nipkow@12564
  1113
wenzelm@12924
  1114
* HOL: removed obsolete theorem "optionE" (use "option.exhaust", or
wenzelm@12924
  1115
the "cases" method);
wenzelm@12924
  1116
wenzelm@12597
  1117
* HOL/GroupTheory: group theory examples including Sylow's theorem (by
webertj@15154
  1118
Florian Kammller);
wenzelm@12597
  1119
wenzelm@12608
  1120
* HOL/IMP: updated and converted to new-style theory format; several
wenzelm@12608
  1121
parts turned into readable document, with proper Isar proof texts and
wenzelm@12608
  1122
some explanations (by Gerwin Klein);
wenzelm@12597
  1123
wenzelm@12734
  1124
* HOL-Real: added Complex_Numbers (by Gertrud Bauer);
wenzelm@12734
  1125
wenzelm@12690
  1126
* HOL-Hyperreal is now a logic image;
wenzelm@12690
  1127
wenzelm@11611
  1128
wenzelm@12022
  1129
*** HOLCF ***
wenzelm@12022
  1130
wenzelm@12622
  1131
* Isar: consts/constdefs supports mixfix syntax for continuous
wenzelm@12622
  1132
operations;
wenzelm@12622
  1133
wenzelm@12622
  1134
* Isar: domain package adapted to new-style theory format, e.g. see
wenzelm@12622
  1135
HOLCF/ex/Dnat.thy;
wenzelm@12622
  1136
wenzelm@12622
  1137
* theory Lift: proper use of rep_datatype lift instead of ML hacks --
wenzelm@12280
  1138
potential INCOMPATIBILITY; now use plain induct_tac instead of former
wenzelm@12280
  1139
lift.induct_tac, always use UU instead of Undef;
wenzelm@12022
  1140
wenzelm@12597
  1141
* HOLCF/IMP: updated and converted to new-style theory;
wenzelm@12597
  1142
wenzelm@12022
  1143
wenzelm@11474
  1144
*** ZF ***
wenzelm@11474
  1145
wenzelm@12622
  1146
* Isar: proper integration of logic-specific tools and packages,
wenzelm@12622
  1147
including theory commands '(co)inductive', '(co)datatype',
wenzelm@12622
  1148
'rep_datatype', 'inductive_cases', as well as methods 'ind_cases',
wenzelm@12622
  1149
'induct_tac', 'case_tac', and 'typecheck' (with attribute 'TC');
wenzelm@12622
  1150
wenzelm@12622
  1151
* theory Main no longer includes AC; for the Axiom of Choice, base
wenzelm@12622
  1152
your theory on Main_ZFC;
wenzelm@12622
  1153
wenzelm@12622
  1154
* the integer library now covers quotients and remainders, with many
wenzelm@12622
  1155
laws relating division to addition, multiplication, etc.;
paulson@12563
  1156
wenzelm@12280
  1157
* ZF/UNITY: Chandy and Misra's UNITY is now available in ZF, giving a
wenzelm@12280
  1158
typeless version of the formalism;
wenzelm@12280
  1159
wenzelm@13025
  1160
* ZF/AC, Coind, IMP, Resid: updated and converted to new-style theory
wenzelm@13025
  1161
format;
wenzelm@12608
  1162
wenzelm@12280
  1163
* ZF/Induct: new directory for examples of inductive definitions,
wenzelm@12608
  1164
including theory Multiset for multiset orderings; converted to
wenzelm@12608
  1165
new-style theory format;
wenzelm@12177
  1166
wenzelm@13025
  1167
* ZF: many new theorems about lists, ordinals, etc.;
paulson@12850
  1168
wenzelm@11474
  1169
wenzelm@11474
  1170
*** General ***
wenzelm@11474
  1171
wenzelm@12280
  1172
* Pure/kernel: meta-level proof terms (by Stefan Berghofer); reference
wenzelm@12280
  1173
variable proof controls level of detail: 0 = no proofs (only oracle
wenzelm@12280
  1174
dependencies), 1 = lemma dependencies, 2 = compact proof terms; see
wenzelm@12280
  1175
also ref manual for further ML interfaces;
wenzelm@12280
  1176
wenzelm@12280
  1177
* Pure/axclass: removed obsolete ML interface
wenzelm@12280
  1178
goal_subclass/goal_arity;
wenzelm@12280
  1179
wenzelm@12280
  1180
* Pure/syntax: new token syntax "num" for plain numerals (without "#"
wenzelm@12280
  1181
of "xnum"); potential INCOMPATIBILITY, since -0, -1 etc. are now
wenzelm@12280
  1182
separate tokens, so expressions involving minus need to be spaced
wenzelm@12280
  1183
properly;
wenzelm@12280
  1184
wenzelm@12312
  1185
* Pure/syntax: support non-oriented infixes, using keyword "infix"
wenzelm@12312
  1186
rather than "infixl" or "infixr";
wenzelm@12312
  1187
wenzelm@12312
  1188
* Pure/syntax: concrete syntax for dummy type variables admits genuine
wenzelm@12312
  1189
sort constraint specifications in type inference; e.g. "x::_::foo"
wenzelm@12312
  1190
ensures that the type of "x" is of sort "foo" (but not necessarily a
wenzelm@12312
  1191
type variable);
wenzelm@12280
  1192
wenzelm@12280
  1193
* Pure/syntax: print modes "type_brackets" and "no_type_brackets"
wenzelm@12280
  1194
control output of nested => (types); the default behavior is
wenzelm@12280
  1195
"type_brackets";
wenzelm@12280
  1196
wenzelm@12280
  1197
* Pure/syntax: builtin parse translation for "_constify" turns valued
wenzelm@11817
  1198
tokens into AST constants;
wenzelm@11474
  1199
wenzelm@12280
  1200
* Pure/syntax: prefer later declarations of translations and print
wenzelm@12280
  1201
translation functions; potential INCOMPATIBILITY: need to reverse
wenzelm@12280
  1202
multiple declarations for same syntax element constant;
wenzelm@12280
  1203
wenzelm@12832
  1204
* Pure/show_hyps reset by default (in accordance to existing Isar
wenzelm@12832
  1205
practice);
wenzelm@12832
  1206
wenzelm@12280
  1207
* Provers/classical: renamed addaltern to addafter, addSaltern to
wenzelm@12280
  1208
addSafter;
wenzelm@12280
  1209
wenzelm@12280
  1210
* Provers/clasimp: ``iff'' declarations now handle conditional rules
wenzelm@12280
  1211
as well;
wenzelm@12253
  1212
wenzelm@12538
  1213
* system: tested support for MacOS X; should be able to get Isabelle +
wenzelm@12538
  1214
Proof General to work in a plain Terminal after installing Poly/ML
wenzelm@12538
  1215
(e.g. from the Isabelle distribution area) and GNU bash alone
wenzelm@12538
  1216
(e.g. from http://www.apple.com); full X11, XEmacs and X-Symbol
wenzelm@12538
  1217
support requires further installations, e.g. from
wenzelm@12538
  1218
http://fink.sourceforge.net/);
wenzelm@12538
  1219
wenzelm@12280
  1220
* system: support Poly/ML 4.1.1 (able to manage larger heaps);
wenzelm@11551
  1221
wenzelm@12753
  1222
* system: reduced base memory usage by Poly/ML (approx. 20 MB instead
wenzelm@12753
  1223
of 40 MB), cf. ML_OPTIONS;
wenzelm@12753
  1224
wenzelm@11633
  1225
* system: Proof General keywords specification is now part of the
wenzelm@11633
  1226
Isabelle distribution (see etc/isar-keywords.el);
wenzelm@11633
  1227
wenzelm@12728
  1228
* system: support for persistent Proof General sessions (refrain from
wenzelm@12728
  1229
outdating all loaded theories on startup); user may create writable
wenzelm@12728
  1230
logic images like this: ``isabelle -q HOL Test'';
wenzelm@12597
  1231
wenzelm@11551
  1232
* system: smart selection of Isabelle process versus Isabelle
wenzelm@11572
  1233
interface, accommodates case-insensitive file systems (e.g. HFS+); may
wenzelm@11572
  1234
run both "isabelle" and "Isabelle" even if file names are badly
wenzelm@11572
  1235
damaged (executable inspects the case of the first letter of its own
wenzelm@11572
  1236
name); added separate "isabelle-process" and "isabelle-interface";
wenzelm@11551
  1237
wenzelm@12472
  1238
* system: refrain from any attempt at filtering input streams; no
wenzelm@12472
  1239
longer support ``8bit'' encoding of old isabelle font, instead proper
wenzelm@12472
  1240
iso-latin characters may now be used; the related isatools
wenzelm@12472
  1241
"symbolinput" and "nonascii" have disappeared as well;
wenzelm@12472
  1242
wenzelm@12472
  1243
* system: removed old "xterm" interface (the print modes "xterm" and
wenzelm@12472
  1244
"xterm_color" are still available for direct use in a suitable
wenzelm@12472
  1245
terminal);
wenzelm@12472
  1246
paulson@11314
  1247
oheimb@11169
  1248
wenzelm@11062
  1249
New in Isabelle99-2 (February 2001)
wenzelm@11062
  1250
-----------------------------------
wenzelm@11062
  1251
nipkow@10224
  1252
*** Overview of INCOMPATIBILITIES ***
nipkow@10224
  1253
paulson@11241
  1254
* HOL: please note that theories in the Library and elsewhere often use the
paulson@11241
  1255
new-style (Isar) format; to refer to their theorems in an ML script you must
wenzelm@12622
  1256
bind them to ML identifers by e.g.      val thm_name = thm "thm_name";
paulson@11241
  1257
wenzelm@11043
  1258
* HOL: inductive package no longer splits induction rule aggressively,
wenzelm@11043
  1259
but only as far as specified by the introductions given; the old
oheimb@11130
  1260
format may be recovered via ML function complete_split_rule or attribute
wenzelm@11043
  1261
'split_rule (complete)';
wenzelm@11043
  1262
wenzelm@10998
  1263
* HOL: induct renamed to lfp_induct, lfp_Tarski to lfp_unfold,
wenzelm@10998
  1264
gfp_Tarski to gfp_unfold;
nipkow@10224
  1265
paulson@10288
  1266
* HOL: contrapos, contrapos2 renamed to contrapos_nn, contrapos_pp;
paulson@10288
  1267
wenzelm@10858
  1268
* HOL: infix "dvd" now has priority 50 rather than 70 (because it is a
wenzelm@10858
  1269
relation); infix "^^" has been renamed "``"; infix "``" has been
wenzelm@10858
  1270
renamed "`"; "univalent" has been renamed "single_valued";
nipkow@10793
  1271
wenzelm@10998
  1272
* HOL/Real: "rinv" and "hrinv" replaced by overloaded "inverse"
wenzelm@10998
  1273
operation;
wenzelm@10998
  1274
nipkow@10868
  1275
* HOLCF: infix "`" has been renamed "$"; the symbol syntax is \<cdot>;
nipkow@10856
  1276
wenzelm@10391
  1277
* Isar: 'obtain' no longer declares "that" fact as simp/intro;
wenzelm@10391
  1278
wenzelm@10401
  1279
* Isar/HOL: method 'induct' now handles non-atomic goals; as a
wenzelm@10401
  1280
consequence, it is no longer monotonic wrt. the local goal context
wenzelm@10401
  1281
(which is now passed through the inductive cases);
wenzelm@10401
  1282
wenzelm@10976
  1283
* Document preparation: renamed standard symbols \<ll> to \<lless> and
wenzelm@10976
  1284
\<gg> to \<ggreater>;
wenzelm@10976
  1285
nipkow@10224
  1286
wenzelm@10245
  1287
*** Document preparation ***
wenzelm@10245
  1288
wenzelm@10858
  1289
* \isabellestyle{NAME} selects version of Isabelle output (currently
wenzelm@10858
  1290
available: are "it" for near math-mode best-style output, "sl" for
wenzelm@10858
  1291
slanted text style, and "tt" for plain type-writer; if no
wenzelm@10858
  1292
\isabellestyle command is given, output is according to slanted
wenzelm@10858
  1293
type-writer);
wenzelm@10858
  1294
wenzelm@10322
  1295
* support sub/super scripts (for single symbols only), input syntax is
wenzelm@10322
  1296
like this: "A\<^sup>*" or "A\<^sup>\<star>";
wenzelm@10322
  1297
wenzelm@10858
  1298
* some more standard symbols; see Appendix A of the system manual for
wenzelm@11062
  1299
the complete list of symbols defined in isabellesym.sty;
wenzelm@10858
  1300
wenzelm@10998
  1301
* improved isabelle style files; more abstract symbol implementation
wenzelm@10998
  1302
(should now use \isamath{...} and \isatext{...} in custom symbol
wenzelm@10998
  1303
definitions);
wenzelm@10998
  1304
wenzelm@10634
  1305
* antiquotation @{goals} and @{subgoals} for output of *dynamic* goals
wenzelm@10634
  1306
state; Note that presentation of goal states does not conform to
wenzelm@10634
  1307
actual human-readable proof documents.  Please do not include goal
wenzelm@10634
  1308
states into document output unless you really know what you are doing!
wenzelm@10322
  1309
wenzelm@11062
  1310
* proper indentation of antiquoted output with proportional LaTeX
wenzelm@11062
  1311
fonts;
wenzelm@10862
  1312
wenzelm@11050
  1313
* no_document ML operator temporarily disables LaTeX document
wenzelm@11050
  1314
generation;
wenzelm@11050
  1315
wenzelm@11062
  1316
* isatool unsymbolize tunes sources for plain ASCII communication;
wenzelm@11062
  1317
wenzelm@10322
  1318
wenzelm@10306
  1319
*** Isar ***
wenzelm@10306
  1320
wenzelm@10547
  1321
* Pure: Isar now suffers initial goal statements to contain unbound
wenzelm@10547
  1322
schematic variables (this does not conform to actual readable proof
wenzelm@10547
  1323
documents, due to unpredictable outcome and non-compositional proof
wenzelm@10547
  1324
checking); users who know what they are doing may use schematic goals
wenzelm@10547
  1325
for Prolog-style synthesis of proven results;
wenzelm@10547
  1326
wenzelm@10391
  1327
* Pure: assumption method (an implicit finishing) now handles actual
wenzelm@10391
  1328
rules as well;
wenzelm@10391
  1329
wenzelm@10391
  1330
* Pure: improved 'obtain' --- moved to Pure, insert "that" into
wenzelm@10391
  1331
initial goal, declare "that" only as Pure intro (only for single
wenzelm@10391
  1332
steps); the "that" rule assumption may now be involved in implicit
wenzelm@10391
  1333
finishing, thus ".." becomes a feasible for trivial obtains;
wenzelm@10391
  1334
wenzelm@10391
  1335
* Pure: default proof step now includes 'intro_classes'; thus trivial
wenzelm@10391
  1336
instance proofs may be performed by "..";
wenzelm@10391
  1337
wenzelm@10391
  1338
* Pure: ?thesis / ?this / "..." now work for pure meta-level
wenzelm@10391
  1339
statements as well;
wenzelm@10306
  1340
wenzelm@11097
  1341
* Pure: more robust selection of calculational rules;
wenzelm@11097
  1342
wenzelm@10858
  1343
* Pure: the builtin notion of 'finished' goal now includes the ==-refl
wenzelm@10858
  1344
rule (as well as the assumption rule);
wenzelm@10858
  1345
wenzelm@10858
  1346
* Pure: 'thm_deps' command visualizes dependencies of theorems and
wenzelm@10858
  1347
lemmas, using the graph browser tool;
wenzelm@10858
  1348
wenzelm@10944
  1349
* Pure: predict failure of "show" in interactive mode;
wenzelm@10944
  1350
wenzelm@11016
  1351
* Pure: 'thms_containing' now takes actual terms as arguments;
wenzelm@11016
  1352
wenzelm@10401
  1353
* HOL: improved method 'induct' --- now handles non-atomic goals
wenzelm@10401
  1354
(potential INCOMPATIBILITY); tuned error handling;
wenzelm@10401
  1355
wenzelm@10557
  1356
* HOL: cases and induct rules now provide explicit hints about the
wenzelm@10547
  1357
number of facts to be consumed (0 for "type" and 1 for "set" rules);
wenzelm@10547
  1358
any remaining facts are inserted into the goal verbatim;
wenzelm@10547
  1359
wenzelm@10858
  1360
* HOL: local contexts (aka cases) may now contain term bindings as
wenzelm@10858
  1361
well; the 'cases' and 'induct' methods new provide a ?case binding for
wenzelm@10858
  1362
the result to be shown in each case;
wenzelm@10858
  1363
wenzelm@10770
  1364
* HOL: added 'recdef_tc' command;
wenzelm@10770
  1365
wenzelm@11016
  1366
* isatool convert assists in eliminating legacy ML scripts;
wenzelm@11016
  1367
wenzelm@10306
  1368
wenzelm@10245
  1369
*** HOL ***
wenzelm@10245
  1370
wenzelm@10245
  1371
* HOL/Library: a collection of generic theories to be used together
wenzelm@10245
  1372
with main HOL; the theory loader path already includes this directory
wenzelm@10245
  1373
by default; the following existing theories have been moved here:
wenzelm@10245
  1374
HOL/Induct/Multiset, HOL/Induct/Acc (as Accessible_Part), HOL/While
wenzelm@10337
  1375
(as While_Combinator), HOL/Lex/Prefix (as List_Prefix);
wenzelm@10245
  1376
wenzelm@10966
  1377
* HOL/Unix: "Some aspects of Unix file-system security", a typical
wenzelm@10966
  1378
modelling and verification task performed in Isabelle/HOL +
wenzelm@10966
  1379
Isabelle/Isar + Isabelle document preparation (by Markus Wenzel).
wenzelm@10966
  1380
wenzelm@11094
  1381
* HOL/Algebra: special summation operator SUM no longer exists, it has
wenzelm@11094
  1382
been replaced by setsum; infix 'assoc' now has priority 50 (like
wenzelm@11094
  1383
'dvd'); axiom 'one_not_zero' has been moved from axclass 'ring' to
wenzelm@11094
  1384
'domain', this makes the theory consistent with mathematical
wenzelm@11094
  1385
literature;
wenzelm@11094
  1386
wenzelm@10514
  1387
* HOL basics: added overloaded operations "inverse" and "divide"
wenzelm@10726
  1388
(infix "/"), syntax for generic "abs" operation, generic summation
wenzelm@11094
  1389
operator \<Sum>;
wenzelm@10452
  1390
wenzelm@10391
  1391
* HOL/typedef: simplified package, provide more useful rules (see also
wenzelm@10391
  1392
HOL/subset.thy);
wenzelm@10391
  1393
wenzelm@10915
  1394
* HOL/datatype: induction rule for arbitrarily branching datatypes is
wenzelm@10915
  1395
now expressed as a proper nested rule (old-style tactic scripts may
wenzelm@10915
  1396
require atomize_strip_tac to cope with non-atomic premises);
wenzelm@10915
  1397
wenzelm@10915
  1398
* HOL: renamed theory "Prod" to "Product_Type", renamed "split" rule
wenzelm@10915
  1399
to "split_conv" (old name still available for compatibility);
wenzelm@10915
  1400
wenzelm@10915
  1401
* HOL: improved concrete syntax for strings (e.g. allows translation
wenzelm@10915
  1402
rules with string literals);
wenzelm@10915
  1403
paulson@12245
  1404
* HOL-Real-Hyperreal: this extends HOL-Real with the hyperreals
paulson@12245
  1405
 and Fleuriot's mechanization of analysis, including the transcendental
paulson@12245
  1406
 functions for the reals;
paulson@10756
  1407
wenzelm@11094
  1408
* HOL/Real, HOL/Hyperreal: improved arithmetic simplification;
wenzelm@10391
  1409
wenzelm@10858
  1410
paulson@10474
  1411
*** CTT ***
paulson@10474
  1412
wenzelm@10547
  1413
* CTT: x-symbol support for Pi, Sigma, -->, : (membership); note that
wenzelm@10547
  1414
"lam" is displayed as TWO lambda-symbols
paulson@10474
  1415
wenzelm@10547
  1416
* CTT: theory Main now available, containing everything (that is, Bool
wenzelm@10547
  1417
and Arith);
wenzelm@10547
  1418
paulson@10474
  1419
wenzelm@10391
  1420
*** General ***
wenzelm@10391
  1421
wenzelm@10547
  1422
* Pure: the Simplifier has been implemented properly as a derived rule
wenzelm@10547
  1423
outside of the actual kernel (at last!); the overall performance
wenzelm@10547
  1424
penalty in practical applications is about 50%, while reliability of
wenzelm@10547
  1425
the Isabelle inference kernel has been greatly improved;
wenzelm@10547
  1426
wenzelm@11112
  1427
* print modes "brackets" and "no_brackets" control output of nested =>
wenzelm@11112
  1428
(types) and ==> (props); the default behaviour is "brackets";
wenzelm@11112
  1429
wenzelm@10391
  1430
* Provers: fast_tac (and friends) now handle actual object-logic rules
wenzelm@10391
  1431
as assumptions as well;
wenzelm@10391
  1432
wenzelm@11124
  1433
* system: support Poly/ML 4.0;
wenzelm@11124
  1434
wenzelm@11124
  1435
* system: isatool install handles KDE version 1 or 2;
wenzelm@11124
  1436
wenzelm@10391
  1437
wenzelm@10245
  1438
wenzelm@10103
  1439
New in Isabelle99-1 (October 2000)
wenzelm@10103
  1440
----------------------------------
wenzelm@8015
  1441
wenzelm@10003
  1442
*** Overview of INCOMPATIBILITIES ***
paulson@8014
  1443
wenzelm@8848
  1444
* HOL: simplification of natural numbers is much changed; to partly
wenzelm@8848
  1445
recover the old behaviour (e.g. to prevent n+n rewriting to #2*n)
wenzelm@8848
  1446
issue the following ML commands:
wenzelm@8848
  1447
wenzelm@8848
  1448
  Delsimprocs Nat_Numeral_Simprocs.cancel_numerals;
wenzelm@8848
  1449
  Delsimprocs [Nat_Numeral_Simprocs.combine_numerals];
paulson@8788
  1450
wenzelm@10129
  1451
* HOL: simplification no longer dives into case-expressions; this is
wenzelm@10129
  1452
controlled by "t.weak_case_cong" for each datatype t;
wenzelm@10003
  1453
wenzelm@10003
  1454
* HOL: nat_less_induct renamed to less_induct;
wenzelm@10003
  1455
wenzelm@10003
  1456
* HOL: systematic renaming of the SOME (Eps) rules, may use isatool
wenzelm@10003
  1457
fixsome to patch .thy and .ML sources automatically;
paulson@8967
  1458
wenzelm@10003
  1459
  select_equality  -> some_equality
wenzelm@10003
  1460
  select_eq_Ex     -> some_eq_ex
wenzelm@10003
  1461
  selectI2EX       -> someI2_ex
wenzelm@10003
  1462
  selectI2         -> someI2
wenzelm@10003
  1463
  selectI          -> someI
wenzelm@10003
  1464
  select1_equality -> some1_equality
wenzelm@10003
  1465
  Eps_sym_eq       -> some_sym_eq_trivial
wenzelm@10003
  1466
  Eps_eq           -> some_eq_trivial
wenzelm@10003
  1467
wenzelm@10003
  1468
* HOL: exhaust_tac on datatypes superceded by new generic case_tac;
wenzelm@10003
  1469
wenzelm@10003
  1470
* HOL: removed obsolete theorem binding expand_if (refer to split_if
wenzelm@10003
  1471
instead);
wenzelm@10003
  1472
wenzelm@10003
  1473
* HOL: the recursion equations generated by 'recdef' are now called
wenzelm@10003
  1474
f.simps instead of f.rules;
wenzelm@10003
  1475
wenzelm@10003
  1476
* HOL: qed_spec_mp now also handles bounded ALL as well;
wenzelm@10003
  1477
wenzelm@10003
  1478
* HOL: 0 is now overloaded, so the type constraint ":: nat" may
wenzelm@10003
  1479
sometimes be needed;
wenzelm@10003
  1480
wenzelm@10003
  1481
* HOL: the constant for "f``x" is now "image" rather than "op ``";
paulson@8014
  1482
paulson@10065
  1483
* HOL: the constant for "f-``x" is now "vimage" rather than "op -``";
paulson@10065
  1484
wenzelm@9330
  1485
* HOL: the disjoint sum is now "<+>" instead of "Plus"; the cartesian
wenzelm@9330
  1486
product is now "<*>" instead of "Times"; the lexicographic product is
wenzelm@9330
  1487
now "<*lex*>" instead of "**";
nipkow@8705
  1488
wenzelm@10003
  1489
* HOL: theory Sexp is now in HOL/Induct examples (it used to be part
wenzelm@10003
  1490
of main HOL, but was unused); better use HOL's datatype package;
paulson@9971
  1491
wenzelm@10137
  1492
* HOL: removed "symbols" syntax for constant "override" of theory Map;
wenzelm@10137
  1493
the old syntax may be recovered as follows:
wenzelm@10137
  1494
wenzelm@10137
  1495
  syntax (symbols)
wenzelm@10137
  1496
    override  :: "('a ~=> 'b) => ('a ~=> 'b) => ('a ~=> 'b)"
wenzelm@10137
  1497
      (infixl "\\<oplus>" 100)
wenzelm@10137
  1498
wenzelm@8848
  1499
* HOL/Real: "rabs" replaced by overloaded "abs" function;
wenzelm@8848
  1500
wenzelm@8887
  1501
* HOL/ML: even fewer consts are declared as global (see theories Ord,
wenzelm@8887
  1502
Lfp, Gfp, WF); this only affects ML packages that refer to const names
wenzelm@8887
  1503
internally;
wenzelm@8887
  1504
wenzelm@10003
  1505
* HOL and ZF: syntax for quotienting wrt an equivalence relation
wenzelm@10003
  1506
changed from A/r to A//r;
wenzelm@9908
  1507
wenzelm@10003
  1508
* ZF: new treatment of arithmetic (nat & int) may break some old
wenzelm@10003
  1509
proofs;
wenzelm@8921
  1510
wenzelm@10003
  1511
* Isar: renamed some attributes (RS -> THEN, simplify -> simplified,
wenzelm@10003
  1512
rulify -> rule_format, elimify -> elim_format, ...);
paulson@9542
  1513
wenzelm@9941
  1514
* Isar/Provers: intro/elim/dest attributes changed; renamed
wenzelm@9941
  1515
intro/intro!/intro!! flags to intro!/intro/intro? (in most cases, one
wenzelm@9937
  1516
should have to change intro!! to intro? only); replaced "delrule" by
wenzelm@9937
  1517
"rule del";
wenzelm@9437
  1518
wenzelm@9612
  1519
* Isar/HOL: renamed "intrs" to "intros" in inductive definitions;
wenzelm@9612
  1520
wenzelm@9437
  1521
* Provers: strengthened force_tac by using new first_best_tac;
oheimb@9402
  1522
wenzelm@10003
  1523
* LaTeX document preparation: several changes of isabelle.sty (see
wenzelm@10003
  1524
lib/texinputs);
wenzelm@8729
  1525
paulson@8014
  1526
wenzelm@8487
  1527
*** Document preparation ***
wenzelm@8358
  1528
wenzelm@9198
  1529
* formal comments (text blocks etc.) in new-style theories may now
wenzelm@9753
  1530
contain antiquotations of thm/prop/term/typ/text to be presented
wenzelm@9753
  1531
according to latex print mode; concrete syntax is like this:
wenzelm@9753
  1532
@{term[show_types] "f(x) = a + x"};
wenzelm@9198
  1533
wenzelm@8358
  1534
* isatool mkdir provides easy setup of Isabelle session directories,
wenzelm@8518
  1535
including proper document sources;
wenzelm@8358
  1536
wenzelm@8358
  1537
* generated LaTeX sources are now deleted after successful run
wenzelm@8358
  1538
(isatool document -c); may retain a copy somewhere else via -D option
wenzelm@8358
  1539
of isatool usedir;
wenzelm@8358
  1540
wenzelm@8566
  1541
* isatool usedir -D now lets isatool latex -o sty update the Isabelle
wenzelm@10003
  1542
style files, achieving self-contained LaTeX sources and simplifying
wenzelm@10003
  1543
LaTeX debugging;
wenzelm@8566
  1544
wenzelm@8518
  1545
* old-style theories now produce (crude) LaTeX output as well;
wenzelm@8358
  1546
wenzelm@9057
  1547
* browser info session directories are now self-contained (may be put
wenzelm@9437
  1548
on WWW server seperately); improved graphs of nested sessions; removed
wenzelm@9437
  1549
graph for 'all sessions';
wenzelm@9057
  1550
wenzelm@10003
  1551
* several improvements in isabelle style files; \isabellestyle{it}
wenzelm@10003
  1552
produces fake math mode output; \isamarkupheader is now \section by
wenzelm@10003
  1553
default; see lib/texinputs/isabelle.sty etc.;
wenzelm@9489
  1554
wenzelm@8358
  1555
wenzelm@8184
  1556
*** Isar ***
wenzelm@8184
  1557
wenzelm@10003
  1558
* Isar/Pure: local results and corresponding term bindings are now
wenzelm@10003
  1559
subject to Hindley-Milner polymorphism (similar to ML); this
wenzelm@10003
  1560
accommodates incremental type-inference very nicely;
wenzelm@8283
  1561
wenzelm@10003
  1562
* Isar/Pure: new derived language element 'obtain' supports
wenzelm@10003
  1563
generalized existence reasoning;
wenzelm@8621
  1564
wenzelm@10003
  1565
* Isar/Pure: new calculational elements 'moreover' and 'ultimately'
wenzelm@10003
  1566
support accumulation of results, without applying any rules yet;
wenzelm@10003
  1567
useful to collect intermediate results without explicit name
wenzelm@10003
  1568
references, and for use with transitivity rules with more than 2
wenzelm@10003
  1569
premises;
wenzelm@8184
  1570
wenzelm@10003
  1571
* Isar/Pure: scalable support for case-analysis type proofs: new
wenzelm@10003
  1572
'case' language element refers to local contexts symbolically, as
wenzelm@10003
  1573
produced by certain proof methods; internally, case names are attached
wenzelm@10003
  1574
to theorems as "tags";
wenzelm@8440
  1575
wenzelm@10003
  1576
* Isar/Pure: theory command 'hide' removes declarations from
wenzelm@9330
  1577
class/type/const name spaces;
wenzelm@9330
  1578
wenzelm@10003
  1579
* Isar/Pure: theory command 'defs' supports option "(overloaded)" to
wenzelm@9330
  1580
indicate potential overloading;
wenzelm@9330
  1581
wenzelm@10003
  1582
* Isar/Pure: changed syntax of local blocks from {{ }} to { };
wenzelm@8621
  1583
wenzelm@10003
  1584
* Isar/Pure: syntax of sorts made 'inner', i.e. have to write
wenzelm@10003
  1585
"{a,b,c}" instead of {a,b,c};
wenzelm@9011
  1586
wenzelm@10003
  1587
* Isar/Pure now provides its own version of intro/elim/dest
wenzelm@10003
  1588
attributes; useful for building new logics, but beware of confusion
wenzelm@10003
  1589
with the version in Provers/classical;
wenzelm@9612
  1590
wenzelm@10003
  1591
* Isar/Pure: the local context of (non-atomic) goals is provided via
wenzelm@10003
  1592
case name 'antecedent';
wenzelm@8440
  1593
wenzelm@10003
  1594
* Isar/Pure: removed obsolete 'transfer' attribute (transfer of thms
wenzelm@10003
  1595
to the current context is now done automatically);
wenzelm@9383
  1596
wenzelm@10003
  1597
* Isar/Pure: theory command 'method_setup' provides a simple interface
wenzelm@10003
  1598
for definining proof methods in ML;
wenzelm@9612
  1599
wenzelm@10003
  1600
* Isar/Provers: intro/elim/dest attributes changed; renamed
wenzelm@9941
  1601
intro/intro!/intro!! flags to intro!/intro/intro? (INCOMPATIBILITY, in
wenzelm@9941
  1602
most cases, one should have to change intro!! to intro? only);
wenzelm@9941
  1603
replaced "delrule" by "rule del";
wenzelm@8283
  1604
wenzelm@10003
  1605
* Isar/Provers: new 'hypsubst' method, plain 'subst' method and
wenzelm@10003
  1606
'symmetric' attribute (the latter supercedes [RS sym]);
wenzelm@10003
  1607
wenzelm@10003
  1608
* Isar/Provers: splitter support (via 'split' attribute and 'simp'
wenzelm@10003
  1609
method modifier); 'simp' method: 'only:' modifier removes loopers as
wenzelm@10003
  1610
well (including splits);
wenzelm@10003
  1611
wenzelm@10003
  1612
* Isar/Provers: Simplifier and Classical methods now support all kind
wenzelm@10003
  1613
of modifiers used in the past, including 'cong', 'iff', etc.
wenzelm@10003
  1614
wenzelm@10003
  1615
* Isar/Provers: added 'fastsimp' and 'clarsimp' methods (combination
wenzelm@10003
  1616
of Simplifier and Classical reasoner);
wenzelm@10003
  1617
wenzelm@10003
  1618
* Isar/HOL: new proof method 'cases' and improved version of 'induct'
wenzelm@10003
  1619
now support named cases; major packages (inductive, datatype, primrec,
wenzelm@10003
  1620
recdef) support case names and properly name parameters;
wenzelm@9612
  1621
wenzelm@10003
  1622
* Isar/HOL: new transitivity rules for substitution in inequalities --
wenzelm@10003
  1623
monotonicity conditions are extracted to be proven at end of
wenzelm@10003
  1624
calculations;
wenzelm@10003
  1625
wenzelm@10003
  1626
* Isar/HOL: removed 'case_split' thm binding, should use 'cases' proof
wenzelm@10003
  1627
method anyway;
wenzelm@10003
  1628
wenzelm@10003
  1629
* Isar/HOL: removed old expand_if = split_if; theorems if_splits =
wenzelm@10003
  1630
split_if split_if_asm; datatype package provides theorems foo.splits =
wenzelm@10003
  1631
foo.split foo.split_asm for each datatype;
wenzelm@10003
  1632
wenzelm@10003
  1633
* Isar/HOL: tuned inductive package, rename "intrs" to "intros"
wenzelm@10003
  1634
(potential INCOMPATIBILITY), emulation of mk_cases feature for proof
wenzelm@10003
  1635
scripts: new 'inductive_cases' command and 'ind_cases' method; (Note:
wenzelm@10003
  1636
use "(cases (simplified))" method in proper proof texts);
wenzelm@10003
  1637
wenzelm@10003
  1638
* Isar/HOL: added global 'arith_split' attribute for 'arith' method;
wenzelm@10003
  1639
wenzelm@10003
  1640
* Isar: names of theorems etc. may be natural numbers as well;
wenzelm@10003
  1641
wenzelm@10003
  1642
* Isar: 'pr' command: optional arguments for goals_limit and
wenzelm@9724
  1643
ProofContext.prems_limit; no longer prints theory contexts, but only
wenzelm@9724
  1644
proof states;
wenzelm@8487
  1645
wenzelm@10003
  1646
* Isar: diagnostic commands 'pr', 'thm', 'prop', 'term', 'typ' admit
wenzelm@8518
  1647
additional print modes to be specified; e.g. "pr(latex)" will print
wenzelm@8518
  1648
proof state according to the Isabelle LaTeX style;
wenzelm@8487
  1649
wenzelm@10003
  1650
* Isar: improved support for emulating tactic scripts, including proof
wenzelm@9612
  1651
methods 'rule_tac' etc., 'cut_tac', 'thin_tac', 'subgoal_tac',
wenzelm@9612
  1652
'rename_tac', 'rotate_tac', 'tactic', and 'case_tac' / 'induct_tac'
wenzelm@9612
  1653
(for HOL datatypes);
wenzelm@8534
  1654
wenzelm@10003
  1655
* Isar: simplified (more robust) goal selection of proof methods: 1st
wenzelm@10003
  1656
goal, all goals, or explicit goal specifier (tactic emulation); thus
wenzelm@10003
  1657
'proof method scripts' have to be in depth-first order;
wenzelm@8673
  1658
wenzelm@10003
  1659
* Isar: tuned 'let' syntax: replaced 'as' keyword by 'and';
wenzelm@8729
  1660
wenzelm@10003
  1661
* Isar: removed 'help' command, which hasn't been too helpful anyway;
wenzelm@10003
  1662
should instead use individual commands for printing items
wenzelm@10003
  1663
(print_commands, print_methods etc.);
wenzelm@9224
  1664
wenzelm@10003
  1665
* Isar: added 'nothing' --- the empty list of theorems;
wenzelm@9239
  1666
wenzelm@8184
  1667
paulson@8014
  1668
*** HOL ***
paulson@8014
  1669
wenzelm@10080
  1670
* HOL/MicroJava: formalization of a fragment of Java, together with a
wenzelm@10080
  1671
corresponding virtual machine and a specification of its bytecode
wenzelm@10080
  1672
verifier and a lightweight bytecode verifier, including proofs of
wenzelm@10080
  1673
type-safety; by Gerwin Klein, Tobias Nipkow, David von Oheimb, and
wenzelm@10080
  1674
Cornelia Pusch (see also the homepage of project Bali at
wenzelm@10080
  1675
http://isabelle.in.tum.de/Bali/);
wenzelm@10080
  1676
wenzelm@8518
  1677
* HOL/Algebra: new theory of rings and univariate polynomials, by
wenzelm@8518
  1678
Clemens Ballarin;
paulson@8014
  1679
wenzelm@10157
  1680
* HOL/NumberTheory: fundamental Theorem of Arithmetic, Chinese
wenzelm@10003
  1681
Remainder Theorem, Fermat/Euler Theorem, Wilson's Theorem, by Thomas M
wenzelm@10003
  1682
Rasmussen;
wenzelm@8570
  1683
wenzelm@10157
  1684
* HOL/Lattice: fundamental concepts of lattice theory and order
wenzelm@10157
  1685
structures, including duals, properties of bounds versus algebraic
wenzelm@10157
  1686
laws, lattice operations versus set-theoretic ones, the Knaster-Tarski
wenzelm@10157
  1687
Theorem for complete lattices etc.; may also serve as a demonstration
wenzelm@10157
  1688
for abstract algebraic reasoning using axiomatic type classes, and
wenzelm@10157
  1689
mathematics-style proof in Isabelle/Isar; by Markus Wenzel;
wenzelm@10157
  1690
wenzelm@10003
  1691
* HOL/Prolog: a (bare-bones) implementation of Lambda-Prolog, by David
wenzelm@10003
  1692
von Oheimb;
paulson@9542
  1693
wenzelm@10164
  1694
* HOL/IMPP: extension of IMP with local variables and mutually
wenzelm@10164
  1695
recursive procedures, by David von Oheimb;
wenzelm@10164
  1696
wenzelm@10003
  1697
* HOL/Lambda: converted into new-style theory and document;
paulson@9542
  1698
wenzelm@10003
  1699
* HOL/ex/Multiquote: example of multiple nested quotations and
wenzelm@10003
  1700
anti-quotations -- basically a generalized version of de-Bruijn
wenzelm@10003
  1701
representation; very useful in avoiding lifting of operations;
wenzelm@8848
  1702
wenzelm@9612
  1703
* HOL/record: added general record equality rule to simpset; fixed
wenzelm@9612
  1704
select-update simplification procedure to handle extended records as
wenzelm@9612
  1705
well; admit "r" as field name;
paulson@9542
  1706
paulson@8967
  1707
* HOL: 0 is now overloaded over the new sort "zero", allowing its use with
paulson@8967
  1708
other numeric types and also as the identity of groups, rings, etc.;
paulson@8967
  1709
paulson@8967
  1710
* HOL: new axclass plus_ac0 for addition with the AC-laws and 0 as identity.
paulson@8967
  1711
Types nat and int belong to this axclass;
paulson@8967
  1712
wenzelm@10003
  1713
* HOL: greatly improved simplification involving numerals of type nat, int, real:
paulson@8788
  1714
   (i + #8 + j) = Suc k simplifies to  #7 + (i + j) = k
paulson@8832
  1715
   i*j + k + j*#3*i     simplifies to  #4*(i*j) + k
paulson@8832
  1716
  two terms #m*u and #n*u are replaced by #(m+n)*u
paulson@8832
  1717
    (where #m, #n and u can implicitly be 1; this is simproc combine_numerals)
paulson@8832
  1718
  and the term/formula #m*u+x ~~ #n*u+y simplifies simplifies to #(m-n)+x ~~ y
paulson@8832
  1719
    or x ~~ #(n-m)+y, where ~~ is one of = < <= or - (simproc cancel_numerals);
paulson@8736
  1720
wenzelm@10003
  1721
* HOL: meson_tac is available (previously in ex/meson.ML); it is a
wenzelm@10003
  1722
powerful prover for predicate logic but knows nothing of clasets; see
wenzelm@10003
  1723
ex/mesontest.ML and ex/mesontest2.ML for example applications;
paulson@9835
  1724
wenzelm@8848
  1725
* HOL: new version of "case_tac" subsumes both boolean case split and
wenzelm@8440
  1726
"exhaust_tac" on datatypes; INCOMPATIBILITY: exhaust_tac no longer
wenzelm@8518
  1727
exists, may define val exhaust_tac = case_tac for ad-hoc portability;
wenzelm@8440
  1728
wenzelm@8848
  1729
* HOL: simplification no longer dives into case-expressions: only the
wenzelm@10129
  1730
selector expression is simplified, but not the remaining arms; to
wenzelm@10129
  1731
enable full simplification of case-expressions for datatype t, you may
wenzelm@10129
  1732
remove t.weak_case_cong from the simpset, either globally (Delcongs
wenzelm@10129
  1733
[thm"t.weak_case_cong"];) or locally (delcongs [...]).
nipkow@8603
  1734
wenzelm@8848
  1735
* HOL/recdef: the recursion equations generated by 'recdef' for
wenzelm@8848
  1736
function 'f' are now called f.simps instead of f.rules; if all
wenzelm@8848
  1737
termination conditions are proved automatically, these simplification
wenzelm@8848
  1738
rules are added to the simpset, as in primrec; rules may be named
wenzelm@8848
  1739
individually as well, resulting in a separate list of theorems for
wenzelm@8848
  1740
each equation;
wenzelm@8848
  1741
wenzelm@9489
  1742
* HOL/While is a new theory that provides a while-combinator. It
wenzelm@9489
  1743
permits the definition of tail-recursive functions without the
wenzelm@9489
  1744
provision of a termination measure. The latter is necessary once the
wenzelm@9489
  1745
invariant proof rule for while is applied.
nipkow@9457
  1746
wenzelm@10003
  1747
* HOL: new (overloaded) notation for the set of elements below/above
wenzelm@10003
  1748
some element: {..u}, {..u(}, {l..}, {)l..}. See theory SetInterval.
nipkow@8925
  1749
wenzelm@8848
  1750
* HOL: theorems impI, allI, ballI bound as "strip";
wenzelm@8848
  1751
wenzelm@10003
  1752
* HOL: new tactic induct_thm_tac: thm -> string -> int -> tactic
nipkow@9746
  1753
induct_tac th "x1 ... xn" expects th to have a conclusion of the form
nipkow@9746
  1754
P v1 ... vn and abbreviates res_inst_tac [("v1","x1"),...,("vn","xn")] th;
nipkow@9746
  1755
wenzelm@10003
  1756
* HOL/Real: "rabs" replaced by overloaded "abs" function;
nipkow@9737
  1757
wenzelm@10003
  1758
* HOL: theory Sexp now in HOL/Induct examples (it used to be part of
wenzelm@10003
  1759
main HOL, but was unused);
nipkow@8626
  1760
wenzelm@10003
  1761
* HOL: fewer consts declared as global (e.g. have to refer to
wenzelm@10003
  1762
"Lfp.lfp" instead of "lfp" internally; affects ML packages only);
wenzelm@8887
  1763
wenzelm@10003
  1764
* HOL: tuned AST representation of nested pairs, avoiding bogus output
wenzelm@10003
  1765
in case of overlap with user translations (e.g. judgements over
wenzelm@10003
  1766
tuples); (note that the underlying logical represenation is still
wenzelm@10003
  1767
bogus);
wenzelm@9349
  1768
nipkow@8412
  1769
paulson@9542
  1770
*** ZF ***
paulson@9542
  1771
wenzelm@10003
  1772
* ZF: simplification automatically cancels common terms in arithmetic
wenzelm@10003
  1773
expressions over nat and int;
paulson@9542
  1774
wenzelm@10003
  1775
* ZF: new treatment of nat to minimize type-checking: all operators
wenzelm@10003
  1776
coerce their operands to a natural number using the function natify,
wenzelm@10003
  1777
making the algebraic laws unconditional;
paulson@9542
  1778
wenzelm@10003
  1779
* ZF: as above, for int: operators coerce their operands to an integer
wenzelm@10003
  1780
using the function intify;
paulson@9542
  1781
wenzelm@10003
  1782
* ZF: the integer library now contains many of the usual laws for the
wenzelm@10003
  1783
orderings, including $<=, and monotonicity laws for $+ and $*;
paulson@9542
  1784
wenzelm@10003
  1785
* ZF: new example ZF/ex/NatSum to demonstrate integer arithmetic
wenzelm@10003
  1786
simplification;
paulson@9388
  1787
wenzelm@10003
  1788
* FOL and ZF: AddIffs now available, giving theorems of the form P<->Q
wenzelm@10003
  1789
to the simplifier and classical reasoner simultaneously;
paulson@9388
  1790
paulson@9388
  1791
wenzelm@8358
  1792
*** General ***
wenzelm@8358
  1793
wenzelm@10003
  1794
* Provers: blast_tac now handles actual object-logic rules as
wenzelm@10003
  1795
assumptions; note that auto_tac uses blast_tac internally as well;
wenzelm@10003
  1796
wenzelm@10003
  1797
* Provers: new functions rulify/rulify_no_asm: thm -> thm for turning
wenzelm@10003
  1798
outer -->/All/Ball into ==>/!!; qed_spec_mp now uses rulify_no_asm;
wenzelm@10003
  1799
wenzelm@9941
  1800
* Provers: delrules now handles destruct rules as well (no longer need
wenzelm@9941
  1801
explicit make_elim);
wenzelm@9941
  1802
wenzelm@10003
  1803
* Provers: Blast_tac now warns of and ignores "weak elimination rules" e.g.
wenzelm@10003
  1804
  [| inj ?f;          ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
wenzelm@10003
  1805
use instead the strong form,
wenzelm@10003
  1806
  [| inj ?f; ~ ?W ==> ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
wenzelm@10003
  1807
in HOL, FOL and ZF the function cla_make_elim will create such rules
wenzelm@10003
  1808
from destruct-rules;
wenzelm@9489
  1809
wenzelm@9709
  1810
* Provers: Simplifier.easy_setup provides a fast path to basic
wenzelm@9709
  1811
Simplifier setup for new object-logics;
wenzelm@9709
  1812
wenzelm@9709
  1813
* Pure: AST translation rules no longer require constant head on LHS;
wenzelm@9349
  1814
wenzelm@9709
  1815
* Pure: improved name spaces: ambiguous output is qualified; support
wenzelm@9709
  1816
for hiding of names;
wenzelm@8729
  1817
wenzelm@10003
  1818
* system: smart setup of canonical ML_HOME, ISABELLE_INTERFACE, and
wenzelm@10003
  1819
XSYMBOL_HOME; no longer need to do manual configuration in most
wenzelm@10003
  1820
situations;
wenzelm@10003
  1821
wenzelm@9709
  1822
* system: compression of ML heaps images may now be controlled via -c
wenzelm@9709
  1823
option of isabelle and isatool usedir (currently only observed by
wenzelm@9709
  1824
Poly/ML);
wenzelm@8358
  1825
wenzelm@9981
  1826
* system: isatool installfonts may handle X-Symbol fonts as well (very
wenzelm@9981
  1827
useful for remote X11);
wenzelm@9981
  1828
wenzelm@9709
  1829
* system: provide TAGS file for Isabelle sources;
wenzelm@9052
  1830
wenzelm@9288
  1831
* ML: infix 'OF' is a version of 'MRS' with more appropriate argument
wenzelm@9288
  1832
order;
wenzelm@9288
  1833
wenzelm@8994
  1834
* ML: renamed flags Syntax.trace_norm_ast to Syntax.trace_ast; global
wenzelm@8994
  1835
timing flag supersedes proof_timing and Toplevel.trace;
wenzelm@8994
  1836
wenzelm@10003
  1837
* ML: new combinators |>> and |>>> for incremental transformations
wenzelm@10003
  1838
with secondary results (e.g. certain theory extensions):
wenzelm@10003
  1839
wenzelm@9330
  1840
* ML: PureThy.add_defs gets additional argument to indicate potential
wenzelm@9330
  1841
overloading (usually false);
wenzelm@9330
  1842
wenzelm@10003
  1843
* ML: PureThy.add_thms/add_axioms/add_defs now return theorems as
wenzelm@10003
  1844
results;
wenzelm@8440
  1845
wenzelm@8358
  1846
wenzelm@8015
  1847
wenzelm@7986
  1848
New in Isabelle99 (October 1999)
wenzelm@7986
  1849
--------------------------------
oheimb@4649
  1850
paulson@5931
  1851
*** Overview of INCOMPATIBILITIES (see below for more details) ***
paulson@5931
  1852
paulson@6922
  1853
* HOL: The THEN and ELSE parts of conditional expressions (if P then x else y)
paulson@6922
  1854
are no longer simplified.  (This allows the simplifier to unfold recursive
paulson@6922
  1855
functional programs.)  To restore the old behaviour, declare
wenzelm@7215
  1856
wenzelm@7215
  1857
    Delcongs [if_weak_cong];
paulson@6922
  1858
wenzelm@6269
  1859
* HOL: Removed the obsolete syntax "Compl A"; use -A for set
wenzelm@6269
  1860
complement;
paulson@5931
  1861
wenzelm@6269
  1862
* HOL: the predicate "inj" is now defined by translation to "inj_on";
paulson@6174
  1863
berghofe@7847
  1864
* HOL/datatype: mutual_induct_tac no longer exists --
berghofe@7847
  1865
  use induct_tac "x_1 ... x_n" instead of mutual_induct_tac ["x_1", ..., "x_n"]
berghofe@7847
  1866
wenzelm@6386
  1867
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
  1868
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
  1869
wenzelm@6269
  1870
* ZF: The con_defs part of an inductive definition may no longer refer
wenzelm@6269
  1871
to constants declared in the same theory;
nipkow@6057
  1872
wenzelm@6269
  1873
* HOL, ZF: the function mk_cases, generated by the inductive
wenzelm@6269
  1874
definition package, has lost an argument.  To simplify its result, it
wenzelm@6269
  1875
uses the default simpset instead of a supplied list of theorems.
paulson@6141
  1876
wenzelm@7215
  1877
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
  1878
nipkow@7619
  1879
* Simplifier: the type of the infix ML functions
wenzelm@8729
  1880
        setSSolver addSSolver setSolver addSolver
nipkow@7619
  1881
is now  simpset * solver -> simpset  where `solver' is a new abstract type
nipkow@7619
  1882
for packaging solvers. A solver is created via
wenzelm@8729
  1883
        mk_solver: string -> (thm list -> int -> tactic) -> solver
nipkow@7619
  1884
where the string argument is only a comment.
nipkow@6057
  1885
wenzelm@7647
  1886
paulson@6069
  1887
*** Proof tools ***
paulson@6069
  1888
wenzelm@6343
  1889
* Provers/Arith/fast_lin_arith.ML contains a functor for creating a
wenzelm@6343
  1890
decision procedure for linear arithmetic. Currently it is used for
wenzelm@7593
  1891
types `nat', `int', and `real' in HOL (see below); it can, should and
wenzelm@7593
  1892
will be instantiated for other types and logics as well.
paulson@6069
  1893
nipkow@7324
  1894
* The simplifier now accepts rewrite rules with flexible heads, eg
nipkow@7324
  1895
     hom ?f ==> ?f(?x+?y) = ?f ?x + ?f ?y
nipkow@7324
  1896
  They are applied like any rule with a non-pattern lhs, i.e. by first-order
nipkow@7324
  1897
  matching.
paulson@6069
  1898
wenzelm@7593
  1899
paulson@6014
  1900
*** General ***
paulson@6014
  1901
wenzelm@7986
  1902
* New Isabelle/Isar subsystem provides an alternative to traditional
wenzelm@7215
  1903
tactical theorem proving; together with the ProofGeneral/isar user
wenzelm@7215
  1904
interface it offers an interactive environment for developing human
wenzelm@7215
  1905
readable proof documents (Isar == Intelligible semi-automated
wenzelm@7886
  1906
reasoning); for further information see isatool doc isar-ref,
wenzelm@7986
  1907
src/HOL/Isar_examples and http://isabelle.in.tum.de/Isar/
wenzelm@7886
  1908
wenzelm@9612
  1909
* improved and simplified presentation of theories: better HTML markup
wenzelm@9612
  1910
(including colors), graph views in several sizes; isatool usedir now
wenzelm@9612
  1911
provides a proper interface for user theories (via -P option); actual
wenzelm@9612
  1912
document preparation based on (PDF)LaTeX is available as well (for
wenzelm@9612
  1913
new-style theories only); see isatool doc system for more information;
wenzelm@7215
  1914
wenzelm@7252
  1915
* native support for Proof General, both for classic Isabelle and
wenzelm@7986
  1916
Isabelle/Isar;
wenzelm@7215
  1917
wenzelm@7791
  1918
* ML function thm_deps visualizes dependencies of theorems and lemmas,
wenzelm@7791
  1919
using the graph browser tool;
wenzelm@7791
  1920
wenzelm@6751
  1921
* Isabelle manuals now also available as PDF;
wenzelm@6751
  1922
wenzelm@6449
  1923
* theory loader rewritten from scratch (may not be fully
wenzelm@6449
  1924
bug-compatible); old loadpath variable has been replaced by show_path,
wenzelm@6671
  1925
add_path, del_path, reset_path functions; new operations such as
wenzelm@7593
  1926
update_thy, touch_thy, remove_thy, use/update_thy_only (see also
wenzelm@7593
  1927
isatool doc ref);
wenzelm@6449
  1928
wenzelm@7215
  1929
* improved isatool install: option -k creates KDE application icon,
wenzelm@7215
  1930
option -p DIR installs standalone binaries;
wenzelm@7215
  1931
wenzelm@7215
  1932
* added ML_PLATFORM setting (useful for cross-platform installations);
wenzelm@7215
  1933
more robust handling of platform specific ML images for SML/NJ;
wenzelm@7215
  1934
wenzelm@7886
  1935
* the settings environment is now statically scoped, i.e. it is never
wenzelm@7986
  1936
created again in sub-processes invoked from isabelle, isatool, or
wenzelm@7886
  1937
Isabelle;
wenzelm@7886
  1938
wenzelm@7215
  1939
* path element specification '~~' refers to '$ISABELLE_HOME';
wenzelm@7215
  1940
wenzelm@6343
  1941
* in locales, the "assumes" and "defines" parts may be omitted if
wenzelm@6343
  1942
empty;
wenzelm@5973
  1943
wenzelm@6269
  1944
* new print_mode "xsymbols" for extended symbol support (e.g. genuine
wenzelm@6269
  1945
long arrows);
wenzelm@6259
  1946
wenzelm@6343
  1947
* new print_mode "HTML";
wenzelm@6343
  1948
wenzelm@6343
  1949
* new flag show_tags controls display of tags of theorems (which are
wenzelm@6343
  1950
basically just comments that may be attached by some tools);
wenzelm@6343
  1951
wenzelm@6461
  1952
* Isamode 2.6 requires patch to accomodate change of Isabelle font
wenzelm@6461
  1953
mode and goal output format:
wenzelm@6461
  1954
wenzelm@6461
  1955
diff -r Isamode-2.6/elisp/isa-load.el Isamode/elisp/isa-load.el
wenzelm@6461
  1956
244c244
wenzelm@6461
  1957
<       (list (isa-getenv "ISABELLE") "-msymbols" logic-name)
wenzelm@6461
  1958
---
wenzelm@6533
  1959
>       (list (isa-getenv "ISABELLE") "-misabelle_font" "-msymbols" logic-name)
wenzelm@6461
  1960
diff -r Isabelle-2.6/elisp/isa-proofstate.el Isamode/elisp/isa-proofstate.el
wenzelm@6461
  1961
181c181
wenzelm@6461
  1962
< (defconst proofstate-proofstart-regexp "^Level [0-9]+$"
wenzelm@6461
  1963
---
wenzelm@6461
  1964
> (defconst proofstate-proofstart-regexp "^Level [0-9]+"
wenzelm@6461
  1965
wenzelm@7450
  1966
* function bind_thms stores lists of theorems (cf. bind_thm);
wenzelm@7450
  1967
wenzelm@7593
  1968
* new shorthand tactics ftac, eatac, datac, fatac;
wenzelm@7593
  1969
wenzelm@7593
  1970
* qed (and friends) now accept "" as result name; in that case the
wenzelm@7986
  1971
theorem is not stored, but proper checks and presentation of the
wenzelm@7986
  1972
result still apply;
wenzelm@7593
  1973
wenzelm@7805
  1974
* theorem database now also indexes constants "Trueprop", "all",
wenzelm@7805
  1975
"==>", "=="; thus thms_containing, findI etc. may retrieve more rules;
wenzelm@7805
  1976
oheimb@6028
  1977
nipkow@6057
  1978
*** HOL ***
nipkow@6057
  1979
wenzelm@7215
  1980
** HOL arithmetic **
wenzelm@7215
  1981
wenzelm@6343
  1982
* There are now decision procedures for linear arithmetic over nat and
wenzelm@6343
  1983
int:
nipkow@6131
  1984
wenzelm@6343
  1985
1. arith_tac copes with arbitrary formulae involving `=', `<', `<=',
wenzelm@6343
  1986
`+', `-', `Suc', `min', `max' and numerical constants; other subterms
wenzelm@6343
  1987
are treated as atomic; subformulae not involving type `nat' or `int'
wenzelm@6343
  1988
are ignored; quantified subformulae are ignored unless they are
wenzelm@6343
  1989
positive universal or negative existential. The tactic has to be
wenzelm@6343
  1990
invoked by hand and can be a little bit slow. In particular, the
wenzelm@6343
  1991
running time is exponential in the number of occurrences of `min' and
wenzelm@6343
  1992
`max', and `-' on `nat'.
nipkow@6131
  1993
wenzelm@6343
  1994
2. fast_arith_tac is a cut-down version of arith_tac: it only takes
wenzelm@6343
  1995
(negated) (in)equalities among the premises and the conclusion into
wenzelm@6343
  1996
account (i.e. no compound formulae) and does not know about `min' and
wenzelm@6343
  1997
`max', and `-' on `nat'. It is fast and is used automatically by the
wenzelm@6343
  1998
simplifier.
nipkow@6131
  1999
wenzelm@6343
  2000
NB: At the moment, these decision procedures do not cope with mixed
wenzelm@6343
  2001
nat/int formulae where the two parts interact, such as `m < n ==>
wenzelm@6343
  2002
int(m) < int(n)'.
oheimb@6028
  2003
wenzelm@7215
  2004
* HOL/Numeral provides a generic theory of numerals (encoded
wenzelm@7313
  2005
efficiently as bit strings); setup for types nat/int/real is in place;
wenzelm@7215
  2006
INCOMPATIBILITY: since numeral syntax is now polymorphic, rather than
wenzelm@7215
  2007
int, existing theories and proof scripts may require a few additional
wenzelm@7215
  2008
type constraints;
wenzelm@7215
  2009
wenzelm@7215
  2010
* integer division and remainder can now be performed on constant
wenzelm@7215
  2011
arguments;
paulson@7157
  2012
wenzelm@7215
  2013
* many properties of integer multiplication, division and remainder
wenzelm@7215
  2014
are now available;
paulson@6922
  2015
paulson@7287
  2016
* An interface to the Stanford Validity Checker (SVC) is available through the
paulson@7287
  2017
tactic svc_tac.  Propositional tautologies and theorems of linear arithmetic
paulson@7287
  2018
are proved automatically.  SVC must be installed separately, and its results
paulson@7287
  2019
must be TAKEN ON TRUST (Isabelle does not check the proofs, but tags any
paulson@7287
  2020
invocation of the underlying oracle).  For SVC see
paulson@7444
  2021
  http://verify.stanford.edu/SVC
paulson@6922
  2022
wenzelm@7125
  2023
* IsaMakefile: the HOL-Real target now builds an actual image;
wenzelm@7125
  2024
wenzelm@7215
  2025
wenzelm@7215
  2026
** HOL misc **
wenzelm@7215
  2027
wenzelm@7595
  2028
* HOL/Real/HahnBanach: the Hahn-Banach theorem for real vector spaces
wenzelm@7595
  2029
(in Isabelle/Isar) -- by Gertrud Bauer;
wenzelm@7595
  2030
wenzelm@7691
  2031
* HOL/BCV: generic model of bytecode verification, i.e. data-flow
wenzelm@7691
  2032
analysis for assembly languages with subtypes;
wenzelm@7691
  2033
wenzelm@6278
  2034
* HOL/TLA (Lamport's Temporal Logic of Actions): major reorganization
wenzelm@6278
  2035
-- avoids syntactic ambiguities and treats state, transition, and
wenzelm@6278
  2036
temporal levels more uniformly; introduces INCOMPATIBILITIES due to
wenzelm@6278
  2037
changed syntax and (many) tactics;
wenzelm@6278
  2038
wenzelm@7791
  2039
* HOL/inductive: Now also handles more general introduction rules such
wenzelm@7791
  2040
  as "ALL y. (y, x) : r --> y : acc r ==> x : acc r"; monotonicity
wenzelm@7791
  2041
  theorems are now maintained within the theory (maintained via the
wenzelm@7791
  2042
  "mono" attribute);
berghofe@7780
  2043
wenzelm@7238
  2044
* HOL/datatype: Now also handles arbitrarily branching datatypes
wenzelm@7238
  2045
  (using function types) such as
wenzelm@7238
  2046
wenzelm@7238
  2047
  datatype 'a tree = Atom 'a | Branch "nat => 'a tree"
berghofe@7047
  2048
wenzelm@7326
  2049
* HOL/record: record_simproc (part of the default simpset) takes care
wenzelm@7326
  2050
of selectors applied to updated records; record_split_tac is no longer
wenzelm@7327
  2051
part of the default claset; update_defs may now be removed from the
wenzelm@7327
  2052
simpset in many cases; COMPATIBILITY: old behavior achieved by
wenzelm@7326
  2053
wenzelm@7326
  2054
  claset_ref () := claset() addSWrapper record_split_wrapper;
wenzelm@7326
  2055
  Delsimprocs [record_simproc]
wenzelm@7326
  2056
wenzelm@6386
  2057
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
  2058
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
  2059
paulson@7287
  2060
* HOL/recdef (TFL): 'congs' syntax now expects comma separated list of theorem
paulson@7287
  2061
names rather than an ML expression;
paulson@7287
  2062
paulson@7287
  2063
* HOL/defer_recdef (TFL): like recdef but the well-founded relation can be
paulson@7287
  2064
supplied later.  Program schemes can be defined, such as
paulson@7287
  2065
    "While B C s = (if B s then While B C (C s) else s)"
paulson@7287
  2066
where the well-founded relation can be chosen after B and C have been given.
wenzelm@6563
  2067
wenzelm@7215
  2068
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
  2069
INCOMPATIBILITY: while [] and infix # syntax is still there, of
wenzelm@7215
  2070
course, ML tools referring to List.list.op # etc. have to be adapted;
wenzelm@7215
  2071
wenzelm@7238
  2072
* HOL_quantifiers flag superseded by "HOL" print mode, which is
wenzelm@7238
  2073
disabled by default; run isabelle with option -m HOL to get back to
wenzelm@7238
  2074
the original Gordon/HOL-style output;
wenzelm@7238
  2075
wenzelm@7238
  2076
* HOL/Ord.thy: new bounded quantifier syntax (input only): ALL x<y. P,
wenzelm@7238
  2077
ALL x<=y. P, EX x<y. P, EX x<=y. P;
wenzelm@7238
  2078
wenzelm@7238
  2079
* HOL basic syntax simplified (more orthogonal): all variants of
wenzelm@7238
  2080
All/Ex now support plain / symbolic / HOL notation; plain syntax for
wenzelm@7238
  2081
Eps operator is provided as well: "SOME x. P[x]";
wenzelm@7238
  2082
berghofe@7320
  2083
* HOL/Sum.thy: sum_case has been moved to HOL/Datatype;
wenzelm@7261
  2084
wenzelm@7280
  2085
* HOL/Univ.thy: infix syntax <*>, <+>, <**>, <+> eliminated and made
wenzelm@7280
  2086
thus available for user theories;
wenzelm@7280
  2087
wenzelm@7300
  2088
* HOLCF/IOA/Sequents: renamed 'Cons' to 'Consq' to avoid clash with
wenzelm@7300
  2089
HOL/List; hardly an INCOMPATIBILITY since '>>' syntax is used all the
wenzelm@7300
  2090
time;
wenzelm@7300
  2091
wenzelm@7986
  2092
* HOL: new tactic smp_tac: int -> int -> tactic, which applies spec
wenzelm@7986
  2093
several times and then mp;
oheimb@7492
  2094
wenzelm@7215
  2095
paulson@7113
  2096
*** LK ***
paulson@7113
  2097
wenzelm@7215
  2098
* the notation <<...>> is now available as a notation for sequences of
wenzelm@7215
  2099
formulas;
paulson@7113
  2100
paulson@7113
  2101
* the simplifier is now installed
paulson@7113
  2102
wenzelm@8729
  2103
* the axiom system has been generalized (thanks to Soren Heilmann)
paulson@7113
  2104
paulson@7113
  2105
* the classical reasoner now has a default rule database
paulson@7113
  2106
paulson@7113
  2107
paulson@6064
  2108
*** ZF ***
paulson@6064
  2109
paulson@6064
  2110
* new primrec section allows primitive recursive functions to be given
wenzelm@6269
  2111
directly (as in HOL) over datatypes and the natural numbers;
paulson@6064
  2112
wenzelm@6269
  2113
* new tactics induct_tac and exhaust_tac for induction (or case
wenzelm@6269
  2114
analysis) over datatypes and the natural numbers;
paulson@6064
  2115
paulson@6064
  2116
* the datatype declaration of type T now defines the recursor T_rec;
paulson@6064
  2117
paulson@6141
  2118
* simplification automatically does freeness reasoning for datatype
wenzelm@6269
  2119
constructors;
paulson@6141
  2120
wenzelm@6269
  2121
* automatic type-inference, with AddTCs command to insert new
wenzelm@6269
  2122
type-checking rules;
paulson@6155
  2123
wenzelm@6269
  2124
* datatype introduction rules are now added as Safe Introduction rules
wenzelm@6269
  2125
to the claset;
paulson@6155
  2126
wenzelm@6269
  2127
* the syntax "if P then x else y" is now available in addition to
wenzelm@6269
  2128
if(P,x,y);
wenzelm@6269
  2129
paulson@6069
  2130
wenzelm@6343
  2131
*** Internal programming interfaces ***
wenzelm@6343
  2132
wenzelm@7919
  2133
* tuned simplifier trace output; new flag debug_simp;
wenzelm@7919
  2134
wenzelm@7420
  2135
* structures Vartab / Termtab (instances of TableFun) offer efficient
wenzelm@7420
  2136
tables indexed by indexname_ord / term_ord (compatible with aconv);
wenzelm@7420
  2137
wenzelm@6386
  2138
* AxClass.axclass_tac lost the theory argument;
wenzelm@6386
  2139
wenzelm@6343
  2140
* tuned current_goals_markers semantics: begin / end goal avoids
wenzelm@6343
  2141
printing empty lines;
wenzelm@6343
  2142
wenzelm@6343
  2143
* removed prs and prs_fn hook, which was broken because it did not
wenzelm@6343
  2144
include \n in its semantics, forcing writeln to add one
wenzelm@6343
  2145
uncoditionally; replaced prs_fn by writeln_fn; consider std_output:
wenzelm@6343
  2146
string -> unit if you really want to output text without newline;
wenzelm@6343
  2147
wenzelm@6343
  2148
* Symbol.output subject to print mode; INCOMPATIBILITY: defaults to
wenzelm@6343
  2149
plain output, interface builders may have to enable 'isabelle_font'
wenzelm@6343
  2150
mode to get Isabelle font glyphs as before;
wenzelm@6343
  2151
wenzelm@6343
  2152
* refined token_translation interface; INCOMPATIBILITY: output length
wenzelm@6343
  2153
now of type real instead of int;
wenzelm@6343
  2154
wenzelm@7196
  2155
* theory loader actions may be traced via new ThyInfo.add_hook
wenzelm@7196
  2156
interface (see src/Pure/Thy/thy_info.ML); example application: keep
wenzelm@7196
  2157
your own database of information attached to *whole* theories -- as
wenzelm@7196
  2158
opposed to intra-theory data slots offered via TheoryDataFun;
wenzelm@7196
  2159
wenzelm@7647
  2160
* proper handling of dangling sort hypotheses (at last!);
wenzelm@7647
  2161
Thm.strip_shyps and Drule.strip_shyps_warning take care of removing
wenzelm@7647
  2162
extra sort hypotheses that can be witnessed from the type signature;
wenzelm@7986
  2163
the force_strip_shyps flag is gone, any remaining shyps are simply
wenzelm@7986
  2164
left in the theorem (with a warning issued by strip_shyps_warning);
wenzelm@7647
  2165
wenzelm@6343
  2166
paulson@6064
  2167
wenzelm@5781
  2168
New in Isabelle98-1 (October 1998)
wenzelm@5781
  2169
----------------------------------
wenzelm@5781
  2170
wenzelm@5127
  2171
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4842
  2172
wenzelm@5726
  2173
* several changes of automated proof tools;
wenzelm@5373
  2174
wenzelm@5726
  2175
* HOL: major changes to the inductive and datatype packages, including
wenzelm@5726
  2176
some minor incompatibilities of theory syntax;
berghofe@5214
  2177
wenzelm@5726
  2178
* HOL: renamed r^-1 to 'converse' from 'inverse'; 'inj_onto' is now
wenzelm@5217
  2179
called `inj_on';
paulson@5160
  2180
nipkow@5275
  2181
* HOL: removed duplicate thms in Arith:
nipkow@5275
  2182
  less_imp_add_less  should be replaced by  trans_less_add1
nipkow@5275
  2183
  le_imp_add_le      should be replaced by  trans_le_add1
paulson@5160
  2184
wenzelm@5726
  2185
* HOL: unary minus is now overloaded (new type constraints may be
wenzelm@5726
  2186
required);
paulson@5490
  2187
wenzelm@5726
  2188
* HOL and ZF: unary minus for integers is now #- instead of #~.  In
wenzelm@5726
  2189
ZF, expressions such as n#-1 must be changed to n#- 1, since #-1 is
wenzelm@5726
  2190
now taken as an integer constant.
paulson@5541
  2191
wenzelm@5726
  2192
* Pure: ML function 'theory_of' renamed to 'theory';
wenzelm@5397
  2193
wenzelm@5363
  2194
wenzelm@5127
  2195
*** Proof tools ***
nipkow@4880
  2196
nipkow@5657
  2197
* Simplifier:
nipkow@5657
  2198
  1. Asm_full_simp_tac is now more aggressive.
nipkow@5657
  2199
     1. It will sometimes reorient premises if that increases their power to
nipkow@5657
  2200
        simplify.
nipkow@5657
  2201
     2. It does no longer proceed strictly from left to right but may also
nipkow@5657
  2202
        rotate premises to achieve further simplification.
nipkow@5657
  2203
     For compatibility reasons there is now Asm_lr_simp_tac which is like the
nipkow@5657
  2204
     old Asm_full_simp_tac in that it does not rotate premises.
nipkow@5657
  2205
  2. The simplifier now knows a little bit about nat-arithmetic.
nipkow@4880
  2206
wenzelm@5127
  2207
* Classical reasoner: wrapper mechanism for the classical reasoner now
wenzelm@5127
  2208
allows for selected deletion of wrappers, by introduction of names for
wenzelm@5127
  2209
wrapper functionals.  This implies that addbefore, addSbefore,
wenzelm@5127
  2210
addaltern, and addSaltern now take a pair (name, tactic) as argument,
wenzelm@5127
  2211
and that adding two tactics with the same name overwrites the first
wenzelm@5127
  2212
one (emitting a warning).
oheimb@4824
  2213
  type wrapper = (int -> tactic) -> (int -> tactic)
oheimb@4649
  2214
  setWrapper, setSWrapper, compWrapper and compSWrapper are replaced by
oheimb@4824
  2215
  addWrapper, addSWrapper: claset * (string * wrapper) -> claset
oheimb@4824
  2216
  delWrapper, delSWrapper: claset *  string            -> claset
oheimb@4649
  2217
  getWrapper is renamed to appWrappers, getSWrapper to appSWrappers;
oheimb@4649
  2218
wenzelm@5705
  2219
* Classical reasoner: addbefore/addSbefore now have APPEND/ORELSE
wenzelm@5726
  2220
semantics; addbefore now affects only the unsafe part of step_tac
wenzelm@5726
  2221
etc.; this affects addss/auto_tac/force_tac, so EXISTING PROOFS MAY
wenzelm@5726
  2222
FAIL, but proofs should be fixable easily, e.g. by replacing Auto_tac
wenzelm@5726
  2223
by Force_tac;
oheimb@5524
  2224
wenzelm@5726
  2225
* Classical reasoner: setwrapper to setWrapper and compwrapper to
wenzelm@5726
  2226
compWrapper; added safe wrapper (and access functions for it);
oheimb@5524
  2227
wenzelm@5127
  2228
* HOL/split_all_tac is now much faster and fails if there is nothing
wenzelm@5726
  2229
to split.  Some EXISTING PROOFS MAY REQUIRE ADAPTION because the order
wenzelm@5726
  2230
and the names of the automatically generated variables have changed.
wenzelm@5726
  2231
split_all_tac has moved within claset() from unsafe wrappers to safe
wenzelm@5726
  2232
wrappers, which means that !!-bound variables are split much more
wenzelm@5726
  2233
aggressively, and safe_tac and clarify_tac now split such variables.
wenzelm@5726
  2234
If this splitting is not appropriate, use delSWrapper "split_all_tac".
wenzelm@5726
  2235
Note: the same holds for record_split_tac, which does the job of
wenzelm@5726
  2236
split_all_tac for record fields.
wenzelm@5127
  2237
wenzelm@5726
  2238
* HOL/Simplifier: Rewrite rules for case distinctions can now be added
wenzelm@5726
  2239
permanently to the default simpset using Addsplits just like
wenzelm@5726
  2240
Addsimps. They can be removed via Delsplits just like
wenzelm@5726
  2241
Delsimps. Lower-case versions are also available.
wenzelm@5127
  2242
wenzelm@5726
  2243
* HOL/Simplifier: The rule split_if is now part of the default
wenzelm@5726
  2244
simpset. This means that the simplifier will eliminate all occurrences
wenzelm@5726
  2245
of if-then-else in the conclusion of a goal. To prevent this, you can
wenzelm@5726
  2246
either remove split_if completely from the default simpset by
wenzelm@5726
  2247
`Delsplits [split_if]' or remove it in a specific call of the
wenzelm@5726
  2248
simplifier using `... delsplits [split_if]'.  You can also add/delete
wenzelm@5726
  2249
other case splitting rules to/from the default simpset: every datatype
wenzelm@5726
  2250
generates suitable rules `split_t_case' and `split_t_case_asm' (where
wenzelm@5726
  2251
t is the name of the datatype).
wenzelm@5127
  2252
wenzelm@5726
  2253
* Classical reasoner / Simplifier combination: new force_tac (and
wenzelm@5127
  2254
derivatives Force_tac, force) combines rewriting and classical
wenzelm@5127
  2255
reasoning (and whatever other tools) similarly to auto_tac, but is
wenzelm@5726
  2256
aimed to solve the given subgoal completely.
wenzelm@5127
  2257
wenzelm@5127
  2258
wenzelm@5127
  2259
*** General ***
wenzelm@5127
  2260
wenzelm@5217
  2261
* new top-level commands `Goal' and `Goalw' that improve upon `goal'
wenzelm@5127
  2262
and `goalw': the theory is no longer needed as an explicit argument -
wenzelm@5127
  2263
the current theory context is used; assumptions are no longer returned
wenzelm@5127
  2264
at the ML-level unless one of them starts with ==> or !!; it is
wenzelm@5217
  2265
recommended to convert to these new commands using isatool fixgoal
wenzelm@5217
  2266
(backup your sources first!);
wenzelm@4842
  2267
wenzelm@5217
  2268
* new top-level commands 'thm' and 'thms' for retrieving theorems from
wenzelm@5207
  2269
the current theory context, and 'theory' to lookup stored theories;
paulson@4806
  2270
paulson@5722
  2271
* new theory section 'locale' for declaring constants, assumptions and
paulson@5722
  2272
definitions that have local scope;
paulson@5722
  2273
wenzelm@5127
  2274
* new theory section 'nonterminals' for purely syntactic types;
wenzelm@4858
  2275
wenzelm@5127
  2276
* new theory section 'setup' for generic ML setup functions
wenzelm@5127
  2277
(e.g. package initialization);
wenzelm@4869
  2278
wenzelm@5131
  2279
* the distribution now includes Isabelle icons: see
wenzelm@5131
  2280
lib/logo/isabelle-{small,tiny}.xpm;
wenzelm@5131
  2281
wenzelm@5363
  2282
* isatool install - install binaries with absolute references to
wenzelm@5363
  2283
ISABELLE_HOME/bin;
wenzelm@5363
  2284
wenzelm@5572
  2285
* isatool logo -- create instances of the Isabelle logo (as EPS);
wenzelm@5572
  2286
wenzelm@5407
  2287
* print mode 'emacs' reserved for Isamode;
wenzelm@5407
  2288
wenzelm@5726
  2289
* support multiple print (ast) translations per constant name;
wenzelm@5726
  2290
wenzelm@6925
  2291
* theorems involving oracles are now printed with a suffixed [!];
wenzelm@6925
  2292
wenzelm@4711
  2293
paulson@4661
  2294
*** HOL ***
paulson@4661
  2295
wenzelm@5710
  2296
* there is now a tutorial on Isabelle/HOL (do 'isatool doc tutorial');
nipkow@5709
  2297
wenzelm@5217
  2298
* HOL/inductive package reorganized and improved: now supports mutual
paulson@5267
  2299
definitions such as
wenzelm@5217
  2300
wenzelm@5217
  2301
  inductive EVEN ODD
wenzelm@5217
  2302
    intrs
wenzelm@5217
  2303
      null "0 : EVEN"
wenzelm@5217
  2304
      oddI "n : EVEN ==> Suc n : ODD"
wenzelm@5217
  2305
      evenI "n : ODD ==> Suc n : EVEN"
wenzelm@5217
  2306
wenzelm@5217
  2307
new theorem list "elims" contains an elimination rule for each of the
wenzelm@5217
  2308
recursive sets; inductive definitions now handle disjunctive premises
wenzelm@5217
  2309
correctly (also ZF);
berghofe@5214
  2310
wenzelm@5217
  2311
INCOMPATIBILITIES: requires Inductive as an ancestor; component
wenzelm@5217
  2312
"mutual_induct" no longer exists - the induction rule is always
wenzelm@5217
  2313
contained in "induct";
wenzelm@5217
  2314
wenzelm@5217
  2315
wenzelm@5217
  2316
* HOL/datatype package re-implemented and greatly improved: now
paulson@5267
  2317
supports mutually recursive datatypes such as
wenzelm@5217
  2318
wenzelm@5217
  2319
  datatype
wenzelm@5217
  2320
    'a aexp = IF_THEN_ELSE ('a bexp) ('a aexp) ('a aexp)
wenzelm@5217
  2321
            | SUM ('a aexp) ('a aexp)
wenzelm@5217
  2322
            | DIFF ('a aexp) ('a aexp)
wenzelm@5217
  2323
            | NUM 'a
wenzelm@5217
  2324
  and
wenzelm@5217
  2325
    'a bexp = LESS ('a aexp) ('a aexp)
wenzelm@5217
  2326
            | AND ('a bexp) ('a bexp)
wenzelm@5217
  2327
            | OR ('a bexp) ('a bexp)
wenzelm@5217
  2328
paulson@5267
  2329
as well as indirectly recursive datatypes such as
berghofe@5214
  2330
wenzelm@5217
  2331
  datatype
wenzelm@5217
  2332
    ('a, 'b) term = Var 'a
wenzelm@5217
  2333
                  | App 'b ((('a, 'b) term) list)
berghofe@5214
  2334
wenzelm@5217
  2335
The new tactic  mutual_induct_tac [<var_1>, ..., <var_n>] i  performs
wenzelm@5217
  2336
induction on mutually / indirectly recursive datatypes.
wenzelm@5217
  2337
wenzelm@5217
  2338
Primrec equations are now stored in theory and can be accessed via
wenzelm@5217
  2339
<function_name>.simps.
wenzelm@5217
  2340
wenzelm@5217
  2341
INCOMPATIBILITIES:
berghofe@5214
  2342
wenzelm@5217
  2343
  - Theories using datatypes must now have theory Datatype as an
wenzelm@5217
  2344
    ancestor.
wenzelm@5217
  2345
  - The specific <typename>.induct_tac no longer exists - use the
wenzelm@5217
  2346
    generic induct_tac instead.
berghofe@5226
  2347
  - natE has been renamed to nat.exhaust - use exhaust_tac
wenzelm@5217
  2348
    instead of res_inst_tac ... natE. Note that the variable
berghofe@5226
  2349
    names in nat.exhaust differ from the names in natE, this
wenzelm@5217
  2350
    may cause some "fragile" proofs to fail.
wenzelm@5217
  2351
  - The theorems split_<typename>_case and split_<typename>_case_asm
wenzelm@5217
  2352
    have been renamed to <typename>.split and <typename>.split_asm.
wenzelm@5217
  2353
  - Since default sorts of type variables are now handled correctly,
wenzelm@5217
  2354
    some datatype definitions may have to be annotated with explicit
wenzelm@5217
  2355
    sort constraints.
wenzelm@5217
  2356
  - Primrec definitions no longer require function name and type
wenzelm@5217
  2357
    of recursive argument.
berghofe@5214
  2358
wenzelm@5217
  2359
Consider using isatool fixdatatype to adapt your theories and proof
wenzelm@5217
  2360
scripts to the new package (backup your sources first!).
wenzelm@5217
  2361
wenzelm@5217
  2362
wenzelm@5726
  2363
* HOL/record package: considerably improved implementation; now
wenzelm@5726
  2364
includes concrete syntax for record types, terms, updates; theorems
wenzelm@5726
  2365
for surjective pairing and splitting !!-bound record variables; proof
wenzelm@5726
  2366
support is as follows:
wenzelm@5726
  2367
wenzelm@5726
  2368
  1) standard conversions (selectors or updates applied to record
wenzelm@5726
  2369
constructor terms) are part of the standard simpset;
wenzelm@5726
  2370
wenzelm@5726
  2371
  2) inject equations of the form ((x, y) = (x', y')) == x=x' & y=y' are
wenzelm@5726
  2372
made part of standard simpset and claset via addIffs;
wenzelm@5726
  2373
wenzelm@5726
  2374
  3) a tactic for record field splitting (record_split_tac) is part of
wenzelm@5726
  2375
the standard claset (addSWrapper);
wenzelm@5726
  2376
wenzelm@5726
  2377
To get a better idea about these rules you may retrieve them via
wenzelm@5726
  2378
something like 'thms "foo.simps"' or 'thms "foo.iffs"', where "foo" is
wenzelm@5726
  2379
the name of your record type.
wenzelm@5726
  2380
wenzelm@5726
  2381
The split tactic 3) conceptually simplifies by the following rule:
wenzelm@5726
  2382
wenzelm@5726
  2383
  "(!!x. PROP ?P x) == (!!a b. PROP ?P (a, b))"
wenzelm@5726
  2384
wenzelm@5726
  2385
Thus any record variable that is bound by meta-all will automatically
wenzelm@5726
  2386
blow up into some record constructor term, consequently the
wenzelm@5726
  2387
simplifications of 1), 2) apply.  Thus force_tac, auto_tac etc. shall
wenzelm@5726
  2388
solve record problems automatically.
wenzelm@5726
  2389
berghofe@5214
  2390
wenzelm@5125
  2391
* reorganized the main HOL image: HOL/Integ and String loaded by
wenzelm@5125
  2392
default; theory Main includes everything;
wenzelm@5125
  2393
paulson@5650
  2394
* automatic simplification of integer sums and comparisons, using cancellation;
paulson@5650
  2395
oheimb@5526
  2396
* added option_map_eq_Some and not_Some_eq to the default simpset and claset;
wenzelm@5127
  2397
wenzelm@5127
  2398
* added disj_not1 = "(~P | Q) = (P --> Q)" to the default simpset;
wenzelm@5127
  2399
wenzelm@5127
  2400
* many new identities for unions, intersections, set difference, etc.;
wenzelm@5127
  2401
wenzelm@5127
  2402
* expand_if, expand_split, expand_sum_case and expand_nat_case are now
wenzelm@5127
  2403
called split_if, split_split, split_sum_case and split_nat_case (to go
wenzelm@5127
  2404
with add/delsplits);
wenzelm@5125
  2405
wenzelm@5127
  2406
* HOL/Prod introduces simplification procedure unit_eq_proc rewriting
wenzelm@5127
  2407
(?x::unit) = (); this is made part of the default simpset, which COULD
wenzelm@5127
  2408
MAKE EXISTING PROOFS FAIL under rare circumstances (consider
wenzelm@5207
  2409
'Delsimprocs [unit_eq_proc];' as last resort); also note that
wenzelm@5207
  2410
unit_abs_eta_conv is added in order to counter the effect of
wenzelm@5207
  2411
unit_eq_proc on (%u::unit. f u), replacing it by f rather than by
wenzelm@5207
  2412
%u.f();
wenzelm@5125
  2413
wenzelm@5217
  2414
* HOL/Fun INCOMPATIBILITY: `inj_onto' is now called `inj_on' (which
wenzelm@5217
  2415
makes more sense);
berghofe@5109
  2416
paulson@5475
  2417
* HOL/Set INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
  2418
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
  2419
  disjointness reasoning but breaking a few old proofs.
paulson@5267
  2420
wenzelm@5217
  2421
* HOL/Relation INCOMPATIBILITY: renamed the relational operator r^-1
wenzelm@5217
  2422
to 'converse' from 'inverse' (for compatibility with ZF and some
wenzelm@5217
  2423
literature);
wenzelm@5085
  2424
wenzelm@5127
  2425
* HOL/recdef can now declare non-recursive functions, with {} supplied as
wenzelm@5127
  2426
the well-founded relation;
oheimb@4838
  2427
paulson@5490
  2428
* HOL/Set INCOMPATIBILITY: the complement of set A is now written -A instead of
paulson@5490
  2429
    Compl A.  The "Compl" syntax remains available as input syntax for this
paulson@5490
  2430
    release ONLY.
paulson@5490
  2431
wenzelm@5127
  2432
* HOL/Update: new theory of function updates:
wenzelm@5127
  2433
    f(a:=b) == %x. if x=a then b else f x
wenzelm@5127
  2434
may also be iterated as in f(a:=b,c:=d,...);
nipkow@5077
  2435
wenzelm@5127
  2436
* HOL/Vimage: new theory for inverse image of a function, syntax f-``B;
paulson@4899
  2437
nipkow@5282
  2438
* HOL/List:
nipkow@5282
  2439
  - new function list_update written xs[i:=v] that updates the i-th
nipkow@5282
  2440
    list position. May also be iterated as in xs[i:=a,j:=b,...].
nipkow@5428
  2441
  - new function `upt' written [i..j(] which generates the list
nipkow@5428
  2442
    [i,i+1,...,j-1], i.e. the upper bound is excluded. To include the upper
nipkow@5428
  2443
    bound write [i..j], which is a shorthand for [i..j+1(].
nipkow@5282
  2444
  - new lexicographic orderings and corresponding wellfoundedness theorems.
paulson@4779
  2445
wenzelm@5127
  2446
* HOL/Arith:
wenzelm@5127
  2447
  - removed 'pred' (predecessor) function;
wenzelm@5127
  2448
  - generalized some theorems about n-1;
wenzelm@5127
  2449
  - many new laws about "div" and "mod";
wenzelm@5127
  2450
  - new laws about greatest common divisors (see theory ex/Primes);
oheimb@4766
  2451
wenzelm@5127
  2452
* HOL/Relation: renamed the relational operator r^-1 "converse"
wenzelm@4842
  2453
instead of "inverse";
wenzelm@4711
  2454
nipkow@5651
  2455
* HOL/Induct/Multiset: a theory of multisets, including the wellfoundedness
nipkow@5651
  2456
  of the multiset ordering;
nipkow@5651
  2457
wenzelm@5127
  2458
* directory HOL/Real: a construction of the reals using Dedekind cuts
nipkow@5651
  2459
  (not included by default);
nipkow@4835
  2460
wenzelm@5127
  2461
* directory HOL/UNITY: Chandy and Misra's UNITY formalism;
wenzelm@4711
  2462
nipkow@5651
  2463
* directory HOL/Hoare: a new version of Hoare logic which permits many-sorted
nipkow@5651
  2464
  programs, i.e. different program variables may have different types.
nipkow@5651
  2465
paulson@5142
  2466
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
  2467
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
  2468
  Now rew can involve either definitions or equalities (either == or =).
wenzelm@5002
  2469
wenzelm@5363
  2470
paulson@4879
  2471
*** ZF ***
paulson@4879
  2472
paulson@5332
  2473
* theory Main includes everything; INCOMPATIBILITY: theory ZF.thy contains
paulson@5332
  2474
  only the theorems proved on ZF.ML;
paulson@5160
  2475
paulson@5475
  2476
* ZF INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
  2477
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
  2478
  disjointness reasoning but breaking a few old proofs.
paulson@5267
  2479
paulson@5160
  2480
* ZF/Update: new theory of function updates
paulson@5160
  2481
    with default rewrite rule  f(x:=y) ` z = if(z=x, y, f`z)
paulson@5160
  2482
  may also be iterated as in f(a:=b,c:=d,...);
paulson@5160
  2483
paulson@4879
  2484
* in  let x=t in u(x), neither t nor u(x) has to be an FOL term.
oheimb@4649
  2485
paulson@5142
  2486
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
  2487
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
  2488
  Now rew can involve either definitions or equalities (either == or =).
paulson@5142
  2489
paulson@5160
  2490
* case_tac provided for compatibility with HOL
paulson@5160
  2491
    (like the old excluded_middle_tac, but with subgoals swapped)
paulson@5160
  2492
wenzelm@4842
  2493
wenzelm@5127
  2494
*** Internal programming interfaces ***
wenzelm@5002
  2495
wenzelm@5251
  2496
* Pure: several new basic modules made available for general use, see
wenzelm@5251
  2497
also src/Pure/README;
wenzelm@5207
  2498
wenzelm@5008
  2499
* improved the theory data mechanism to support encapsulation (data
wenzelm@5008
  2500
kind name replaced by private Object.kind, acting as authorization
wenzelm@5373
  2501
key); new type-safe user interface via functor TheoryDataFun; generic
wenzelm@5373
  2502
print_data function becomes basically useless;
wenzelm@5002
  2503
wenzelm@5251
  2504
* removed global_names compatibility flag -- all theory declarations
wenzelm@5251
  2505
are qualified by default;
wenzelm@5251
  2506
wenzelm@5085
  2507
* module Pure/Syntax now offers quote / antiquote translation
wenzelm@5085
  2508
functions (useful for Hoare logic etc. with implicit dependencies);
wenzelm@5373
  2509
see HOL/ex/Antiquote for an example use;
wenzelm@5085
  2510
wenzelm@5127
  2511
* Simplifier now offers conversions (asm_)(full_)rewrite: simpset ->
wenzelm@5127
  2512
cterm -> thm;
wenzelm@5127
  2513
wenzelm@5207
  2514
* new tactical CHANGED_GOAL for checking that a tactic modifies a
wenzelm@5207
  2515
subgoal;
paulson@5142
  2516
wenzelm@5251
  2517
* Display.print_goals function moved to Locale.print_goals;
wenzelm@5251
  2518
wenzelm@5731
  2519
* standard print function for goals supports current_goals_markers
wenzelm@5731
  2520
variable for marking begin of proof, end of proof, start of goal; the
wenzelm@5731
  2521
default is ("", "", ""); setting current_goals_markers := ("<proof>",
wenzelm@5731
  2522
"</proof>", "<goal>") causes SGML like tagged proof state printing,
wenzelm@5731
  2523
for example;
wenzelm@5731
  2524
wenzelm@5002
  2525
wenzelm@5002
  2526
wenzelm@4410
  2527
New in Isabelle98 (January 1998)
wenzelm@4410
  2528
--------------------------------
wenzelm@4410
  2529
wenzelm@4410
  2530
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4410
  2531
wenzelm@4410
  2532
* changed lexical syntax of terms / types: dots made part of long
wenzelm@4410
  2533
identifiers, e.g. "%x.x" no longer possible, should be "%x. x";
wenzelm@4410
  2534
wenzelm@4410
  2535
* simpset (and claset) reference variable replaced by functions
wenzelm@4410
  2536
simpset / simpset_ref;
wenzelm@4410
  2537
wenzelm@4410
  2538
* no longer supports theory aliases (via merge) and non-trivial
wenzelm@4410
  2539
implicit merge of thms' signatures;
wenzelm@4410
  2540
wenzelm@4410
  2541
* most internal names of constants changed due to qualified names;
wenzelm@4410
  2542
wenzelm@4410
  2543
* changed Pure/Sequence interface (see Pure/seq.ML);
wenzelm@4410
  2544
wenzelm@3454
  2545
paulson@3715
  2546
*** General Changes ***
paulson@3715
  2547
wenzelm@4174
  2548
* hierachically structured name spaces (for consts, types, axms, thms
wenzelm@3943
  2549
etc.); new lexical class 'longid' (e.g. Foo.bar.x) may render much of
wenzelm@4108
  2550
old input syntactically incorrect (e.g. "%x.x"); COMPATIBILITY:
wenzelm@4108
  2551
isatool fixdots ensures space after dots (e.g. "%x. x"); set
wenzelm@4174
  2552
long_names for fully qualified output names; NOTE: ML programs
wenzelm@4174
  2553
(special tactics, packages etc.) referring to internal names may have
wenzelm@4174
  2554
to be adapted to cope with fully qualified names; in case of severe
wenzelm@4174
  2555
backward campatibility problems try setting 'global_names' at compile
wenzelm@4174
  2556
time to have enrything declared within a flat name space; one may also
wenzelm@4174
  2557
fine tune name declarations in theories via the 'global' and 'local'
wenzelm@4174
  2558
section;
wenzelm@4108
  2559
wenzelm@4108
  2560
* reimplemented the implicit simpset and claset using the new anytype
wenzelm@4108
  2561
data filed in signatures; references simpset:simpset ref etc. are
wenzelm@4108
  2562
replaced by functions simpset:unit->simpset and
wenzelm@4108
  2563
simpset_ref:unit->simpset ref; COMPATIBILITY: use isatool fixclasimp
wenzelm@4108
  2564
to patch your ML files accordingly;
paulson@3856
  2565
wenzelm@3857
  2566
* HTML output now includes theory graph data for display with Java
wenzelm@3857
  2567
applet or isatool browser; data generated automatically via isatool
wenzelm@3901
  2568
usedir (see -i option, ISABELLE_USEDIR_OPTIONS);
wenzelm@3857
  2569
paulson@3856
  2570
* defs may now be conditional; improved rewrite_goals_tac to handle
paulson@3856
  2571
conditional equations;
paulson@3856
  2572
wenzelm@4174
  2573
* defs now admits additional type arguments, using TYPE('a) syntax;
wenzelm@4174
  2574
wenzelm@3901
  2575
* theory aliases via merge (e.g. M=A+B+C) no longer supported, always
wenzelm@3901
  2576
creates a new theory node; implicit merge of thms' signatures is
wenzelm@4112
  2577
restricted to 'trivial' ones; COMPATIBILITY: one may have to use
wenzelm@3901
  2578
transfer:theory->thm->thm in (rare) cases;
wenzelm@3901
  2579
wenzelm@3968
  2580
* improved handling of draft signatures / theories; draft thms (and
wenzelm@3968
  2581
ctyps, cterms) are automatically promoted to real ones;
wenzelm@3968
  2582
wenzelm@3901
  2583
* slightly changed interfaces for oracles: admit many per theory, named
wenzelm@3901
  2584
(e.g. oracle foo = mlfun), additional name argument for invoke_oracle;
wenzelm@3901
  2585
wenzelm@3901
  2586
* print_goals: optional output of const types (set show_consts and
wenzelm@3901
  2587
show_types);
wenzelm@3851
  2588
wenzelm@4388
  2589
* improved output of warnings (###) and errors (***);
wenzelm@3697
  2590
paulson@4178
  2591
* subgoal_tac displays a warning if the new subgoal has type variables;
paulson@4178
  2592
paulson@3715
  2593
* removed old README and Makefiles;
wenzelm@3697
  2594
paulson@3856
  2595
* replaced print_goals_ref hook by print_current_goals_fn and result_error_fn;
wenzelm@3670
  2596
paulson@3715
  2597
* removed obsolete init_pps and init_database;
paulson@3715
  2598
paulson@3715
  2599
* deleted the obsolete tactical STATE, which was declared by
paulson@3715
  2600
    fun STATE tacfun st = tacfun st st;
paulson@3715
  2601
wenzelm@4388
  2602
* cd and use now support path variables, e.g. $ISABELLE_HOME, or ~
wenzelm@4388
  2603
(which abbreviates $HOME);
wenzelm@4269
  2604
wenzelm@4269
  2605
* changed Pure/Sequence interface (see Pure/seq.ML); COMPATIBILITY:
wenzelm@4269
  2606
use isatool fixseq to adapt your ML programs (this works for fully
wenzelm@4269
  2607
qualified references to the Sequence structure only!);
wenzelm@4269
  2608
wenzelm@4381
  2609
* use_thy no longer requires writable current directory; it always
wenzelm@4381
  2610
reloads .ML *and* .thy file, if either one is out of date;
wenzelm@4269
  2611
paulson@3715
  2612
paulson@3715
  2613
*** Classical Reasoner ***
paulson@3715
  2614
wenzelm@3744
  2615
* Clarify_tac, clarify_tac, clarify_step_tac, Clarify_step_tac: new
wenzelm@3744
  2616
tactics that use classical reasoning to simplify a subgoal without
wenzelm@3744
  2617
splitting it into several subgoals;
paulson@3715
  2618
paulson@3719
  2619
* Safe_tac: like safe_tac but uses the default claset;
paulson@3719
  2620
paulson@3715
  2621
paulson@3715
  2622
*** Simplifier ***
paulson@3715
  2623
paulson@3715
  2624
* added simplification meta rules:
paulson@3715
  2625
    (asm_)(full_)simplify: simpset -> thm -> thm;
paulson@3715
  2626
paulson@3715
  2627
* simplifier.ML no longer part of Pure -- has to be loaded by object
paulson@3715
  2628
logics (again);
paulson@3715
  2629
paulson@3715
  2630
* added prems argument to simplification procedures;
paulson@3715
  2631