NEWS
author wenzelm
Sun Jun 20 09:26:29 2004 +0200 (2004-06-20)
changeset 14972 51f95648abad
parent 14934 bf9f525d4821
child 15011 35be762f58f9
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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* 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/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: tuned internal renaming of symbolic identifiers -- attach
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  primes instead of base 26 numbers.
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* Document preparation: antiquotations now provide the option
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  'locale=NAME' to specify an alternative context used for evaluating
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  and printing the subsequent argument, as in @{thm [locale=LC]
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  fold_commute}, for example.
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* Document preparation: commands 'display_drafts' and 'print_drafts'
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  perform simple output of raw sources.  Only those symbols that do
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  not require additional LaTeX packages (depending on comments in
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  isabellesym.sty) are displayed properly, everything else is left
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  verbatim.  We use isatool display and isatool print as front ends;
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  these are subject to the DVI_VIEWER and PRINT_COMMAND settings,
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  respectively.
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* ML: output via the Isabelle channels of writeln/warning/error
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  etc. is now passed through Output.output, with a hook for arbitrary
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  transformations depending on the print_mode (cf. Output.add_mode --
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  the first active mode that provides a output function wins).
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  Already formatted output may be embedded into further text via
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  Output.raw; the result of Pretty.string_of/str_of and derived
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  functions (string_of_term/cterm/thm etc.) is already marked raw to
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  accommodate easy composition of diagnostic messages etc.
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  Programmers rarely need to care about Output.output or Output.raw at
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  all, with some notable exceptions: Output.output is required when
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  bypassing the standard channels (writeln etc.), or in token
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  translations to produce properly formatted results; Output.raw is
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  required when capturing already output material that will eventually
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  be presented to the user a second time.  For the default print mode,
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  both Output.output and Output.raw have no effect.
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*** HOL ***
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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: 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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* Simplifier: "record_upd_simproc" for simplification of multiple
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  record updates enabled by default.  INCOMPATIBILITY: old proofs
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  break occasionally, since simplification is more powerful by
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  default.
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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 First
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  Isomorphism Theorem (on quotienting by the kernel of a homomorphism).
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New in Isabelle2004 (April 2004)
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--------------------------------
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*** General ***
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* Provers/order.ML:  new efficient reasoner for partial and linear orders.
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  Replaces linorder.ML.
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* Pure: Greek letters (except small lambda, \<lambda>), as well as Gothic
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  (\<aa>...\<zz>\<AA>...\<ZZ>), calligraphic (\<A>...\<Z>), and Euler
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  (\<a>...\<z>), are now considered normal letters, and can therefore
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  be used anywhere where an ASCII letter (a...zA...Z) has until
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  now. COMPATIBILITY: This obviously changes the parsing of some
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  terms, especially where a symbol has been used as a binder, say
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  '\<Pi>x. ...', which is now a type error since \<Pi>x will be parsed
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  as an identifier.  Fix it by inserting a space around former
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  symbols.  Call 'isatool fixgreek' to try to fix parsing errors in
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  existing theory and ML files.
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* Pure: Macintosh and Windows line-breaks are now allowed in theory files.
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* Pure: single letter sub/superscripts (\<^isub> and \<^isup>) are now
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  allowed in identifiers. Similar to Greek letters \<^isub> is now considered
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  a normal (but invisible) letter. For multiple letter subscripts repeat
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  \<^isub> like this: x\<^isub>1\<^isub>2.
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* Pure: There are now sub-/superscripts that can span more than one
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  character. Text between \<^bsub> and \<^esub> is set in subscript in
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  ProofGeneral and LaTeX, text between \<^bsup> and \<^esup> in
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  superscript. The new control characters are not identifier parts.
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* Pure: Control-symbols of the form \<^raw:...> will literally print the
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  content of "..." to the latex file instead of \isacntrl... . The "..."
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  may consist of any printable characters excluding the end bracket >.
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* Pure: Using new Isar command "finalconsts" (or the ML functions
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  Theory.add_finals or Theory.add_finals_i) it is now possible to
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  declare constants "final", which prevents their being given a definition
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  later.  It is useful for constants whose behaviour is fixed axiomatically
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  rather than definitionally, such as the meta-logic connectives.
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* Pure: 'instance' now handles general arities with general sorts
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  (i.e. intersections of classes),
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* Presentation: generated HTML now uses a CSS style sheet to make layout
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  (somewhat) independent of content. It is copied from lib/html/isabelle.css.
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  It can be changed to alter the colors/layout of generated pages.
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*** Isar ***
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* Tactic emulation methods rule_tac, erule_tac, drule_tac, frule_tac,
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  cut_tac, subgoal_tac and thin_tac:
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  - Now understand static (Isar) contexts.  As a consequence, users of Isar
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    locales are no longer forced to write Isar proof scripts.
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    For details see Isar Reference Manual, paragraph 4.3.2: Further tactic
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    emulations.
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  - INCOMPATIBILITY: names of variables to be instantiated may no
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    longer be enclosed in quotes.  Instead, precede variable name with `?'.
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    This is consistent with the instantiation attribute "where".
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* Attributes "where" and "of":
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  - Now take type variables of instantiated theorem into account when reading
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    the instantiation string.  This fixes a bug that caused instantiated
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    theorems to have too special types in some circumstances.
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  - "where" permits explicit instantiations of type variables.
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* Calculation commands "moreover" and "also" no longer interfere with
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  current facts ("this"), admitting arbitrary combinations with "then"
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  and derived forms.
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* Locales:
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  - Goal statements involving the context element "includes" no longer
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    generate theorems with internal delta predicates (those ending on
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    "_axioms") in the premise.
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    Resolve particular premise with <locale>.intro to obtain old form.
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  - Fixed bug in type inference ("unify_frozen") that prevented mix of target
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    specification and "includes" elements in goal statement.
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  - Rule sets <locale>.intro and <locale>.axioms no longer declared as
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    [intro?] and [elim?] (respectively) by default.
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  - Experimental command for instantiation of locales in proof contexts:
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        instantiate <label>[<attrs>]: <loc>
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    Instantiates locale <loc> and adds all its theorems to the current context
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    taking into account their attributes.  Label and attrs are optional
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    modifiers, like in theorem declarations.  If present, names of
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    instantiated theorems are qualified with <label>, and the attributes
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    <attrs> are applied after any attributes these theorems might have already.
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      If the locale has assumptions, a chained fact of the form
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    "<loc> t1 ... tn" is expected from which instantiations of the parameters
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    are derived.  The command does not support old-style locales declared
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    with "locale (open)".
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      A few (very simple) examples can be found in FOL/ex/LocaleInst.thy.
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* HOL: Tactic emulation methods induct_tac and case_tac understand static
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  (Isar) contexts.
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*** HOL ***
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* Proof import: new image HOL4 contains the imported library from
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  the HOL4 system with about 2500 theorems. It is imported by
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  replaying proof terms produced by HOL4 in Isabelle. The HOL4 image
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  can be used like any other Isabelle image.  See
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  HOL/Import/HOL/README for more information.
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* Simplifier:
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  - Much improved handling of linear and partial orders.
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    Reasoners for linear and partial orders are set up for type classes
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    "linorder" and "order" respectively, and are added to the default simpset
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    as solvers.  This means that the simplifier can build transitivity chains
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    to solve goals from the assumptions.
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  - INCOMPATIBILITY: old proofs break occasionally.  Typically, applications
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    of blast or auto after simplification become unnecessary because the goal
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    is solved by simplification already.
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* Numerics: new theory Ring_and_Field contains over 250 basic numerical laws,
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    all proved in axiomatic type classes for semirings, rings and fields.
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* Numerics:
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  - Numeric types (nat, int, and in HOL-Complex rat, real, complex, etc.) are
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    now formalized using the Ring_and_Field theory mentioned above.
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  - INCOMPATIBILITY: simplification and arithmetic behaves somewhat differently
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    than before, because now they are set up once in a generic manner.
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  - INCOMPATIBILITY: many type-specific arithmetic laws have gone.
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    Look for the general versions in Ring_and_Field (and Power if they concern
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    exponentiation).
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* Type "rat" of the rational numbers is now available in HOL-Complex.
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* Records:
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  - Record types are now by default printed with their type abbreviation
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    instead of the list of all field types. This can be configured via
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    the reference "print_record_type_abbr".
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  - Simproc "record_upd_simproc" for simplification of multiple updates added
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    (not enabled by default).
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  - Simproc "record_ex_sel_eq_simproc" to simplify EX x. sel r = x resp.
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    EX x. x = sel r to True (not enabled by default).
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  - Tactic "record_split_simp_tac" to split and simplify records added.
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* 'specification' command added, allowing for definition by
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  specification.  There is also an 'ax_specification' command that
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  introduces the new constants axiomatically.
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* arith(_tac) is now able to generate counterexamples for reals as well.
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* HOL-Algebra: new locale "ring" for non-commutative rings.
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* HOL-ex: InductiveInvariant_examples illustrates advanced recursive function
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  definitions, thanks to Sava Krsti\'{c} and John Matthews.
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* HOL-Matrix: a first theory for matrices in HOL with an application of
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  matrix theory to linear programming.
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* Unions and Intersections:
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  The x-symbol output syntax of UN and INT has been changed
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  from "\<Union>x \<in> A. B" to "\<Union\<^bsub>x \<in> A\<^esub> B"
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  i.e. the index formulae has become a subscript, like in normal math.
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  Similarly for "\<Union>x. B", and for \<Inter> instead of \<Union>.
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  The subscript version is also accepted as input syntax.
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* Unions and Intersections over Intervals:
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  There is new short syntax "UN i<=n. A" for "UN i:{0..n}. A". There is
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  also an x-symbol version with subscripts "\<Union>\<^bsub>i <= n\<^esub>. A"
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  like in normal math, and corresponding versions for < and for intersection.
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* ML: the legacy theory structures Int and List have been removed. They had
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  conflicted with ML Basis Library structures having the same names.
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* 'refute' command added to search for (finite) countermodels.  Only works
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  for a fragment of HOL.  The installation of an external SAT solver is
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  highly recommended.  See "HOL/Refute.thy" for details.
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* 'quickcheck' command: Allows to find counterexamples by evaluating
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  formulae under an assignment of free variables to random values.
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  In contrast to 'refute', it can deal with inductive datatypes,
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  but cannot handle quantifiers. See "HOL/ex/Quickcheck_Examples.thy"
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  for examples.
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*** HOLCF ***
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* Streams now come with concatenation and are part of the HOLCF image
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New in Isabelle2003 (May 2003)
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------------------------------
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*** General ***
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* Provers/simplifier:
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  - Completely reimplemented method simp (ML: Asm_full_simp_tac):
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    Assumptions are now subject to complete mutual simplification,
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    not just from left to right. The simplifier now preserves
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    the order of assumptions.
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    Potential INCOMPATIBILITY:
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    -- simp sometimes diverges where the old version did
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       not, e.g. invoking simp on the goal
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        [| P (f x); y = x; f x = f y |] ==> Q
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       now gives rise to the infinite reduction sequence
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        P(f x) --(f x = f y)--> P(f y) --(y = x)--> P(f x) --(f x = f y)--> ...
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       Using "simp (asm_lr)" (ML: Asm_lr_simp_tac) instead often solves this
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       kind of problem.
nipkow@13781
   334
nipkow@13781
   335
    -- Tactics combining classical reasoner and simplification (such as auto)
nipkow@13781
   336
       are also affected by this change, because many of them rely on
nipkow@13781
   337
       simp. They may sometimes diverge as well or yield a different numbers
nipkow@13781
   338
       of subgoals. Try to use e.g. force, fastsimp, or safe instead of auto
nipkow@13781
   339
       in case of problems. Sometimes subsequent calls to the classical
nipkow@13781
   340
       reasoner will fail because a preceeding call to the simplifier too
nipkow@13781
   341
       eagerly simplified the goal, e.g. deleted redundant premises.
berghofe@13618
   342
berghofe@13618
   343
  - The simplifier trace now shows the names of the applied rewrite rules
berghofe@13618
   344
nipkow@13829
   345
  - You can limit the number of recursive invocations of the simplifier
nipkow@13829
   346
    during conditional rewriting (where the simplifie tries to solve the
nipkow@13829
   347
    conditions before applying the rewrite rule):
nipkow@13829
   348
    ML "simp_depth_limit := n"
nipkow@13829
   349
    where n is an integer. Thus you can force termination where previously
nipkow@13829
   350
    the simplifier would diverge.
nipkow@13829
   351
ballarin@13835
   352
  - Accepts free variables as head terms in congruence rules.  Useful in Isar.
nipkow@13829
   353
ballarin@13938
   354
  - No longer aborts on failed congruence proof.  Instead, the
ballarin@13938
   355
    congruence is ignored.
ballarin@13938
   356
berghofe@14008
   357
* Pure: New generic framework for extracting programs from constructive
berghofe@14008
   358
  proofs. See HOL/Extraction.thy for an example instantiation, as well
berghofe@14008
   359
  as HOL/Extraction for some case studies.
berghofe@14008
   360
nipkow@13868
   361
* Pure: The main goal of the proof state is no longer shown by default, only
nipkow@13868
   362
the subgoals. This behaviour is controlled by a new flag.
ballarin@13835
   363
   PG menu: Isabelle/Isar -> Settings -> Show Main Goal
nipkow@13815
   364
(ML: Proof.show_main_goal).
nipkow@13815
   365
nipkow@13815
   366
* Pure: You can find all matching introduction rules for subgoal 1, i.e. all
nipkow@13815
   367
rules whose conclusion matches subgoal 1:
nipkow@13815
   368
      PG menu: Isabelle/Isar -> Show me -> matching rules
nipkow@13815
   369
The rules are ordered by how closely they match the subgoal.
nipkow@13815
   370
In particular, rules that solve a subgoal outright are displayed first
nipkow@13815
   371
(or rather last, the way they are printed).
nipkow@13815
   372
(ML: ProofGeneral.print_intros())
nipkow@13815
   373
nipkow@13815
   374
* Pure: New flag trace_unify_fail causes unification to print
nipkow@13781
   375
diagnostic information (PG: in trace buffer) when it fails. This is
nipkow@13781
   376
useful for figuring out why single step proofs like rule, erule or
nipkow@13781
   377
assumption failed.
nipkow@13781
   378
nipkow@13815
   379
* Pure: Locale specifications now produce predicate definitions
wenzelm@13410
   380
according to the body of text (covering assumptions modulo local
wenzelm@13410
   381
definitions); predicate "loc_axioms" covers newly introduced text,
wenzelm@13410
   382
while "loc" is cumulative wrt. all included locale expressions; the
wenzelm@13410
   383
latter view is presented only on export into the global theory
wenzelm@13410
   384
context; potential INCOMPATIBILITY, use "(open)" option to fall back
wenzelm@13410
   385
on the old view without predicates;
wenzelm@13410
   386
wenzelm@13459
   387
* Pure: predefined locales "var" and "struct" are useful for sharing
wenzelm@13459
   388
parameters (as in CASL, for example); just specify something like
wenzelm@13459
   389
``var x + var y + struct M'' as import;
wenzelm@13459
   390
wenzelm@13463
   391
* Pure: improved thms_containing: proper indexing of facts instead of
wenzelm@13463
   392
raw theorems; check validity of results wrt. current name space;
wenzelm@13463
   393
include local facts of proof configuration (also covers active
wenzelm@13541
   394
locales), cover fixed variables in index; may use "_" in term
wenzelm@13541
   395
specification; an optional limit for the number of printed facts may
wenzelm@13541
   396
be given (the default is 40);
wenzelm@13541
   397
wenzelm@13541
   398
* Pure: disallow duplicate fact bindings within new-style theory files
wenzelm@13541
   399
(batch-mode only);
wenzelm@13540
   400
wenzelm@13463
   401
* Provers: improved induct method: assumptions introduced by case
wenzelm@13463
   402
"foo" are split into "foo.hyps" (from the rule) and "foo.prems" (from
wenzelm@13463
   403
the goal statement); "foo" still refers to all facts collectively;
wenzelm@13463
   404
paulson@13550
   405
* Provers: the function blast.overloaded has been removed: all constants
paulson@13550
   406
are regarded as potentially overloaded, which improves robustness in exchange
paulson@13550
   407
for slight decrease in efficiency;
paulson@13550
   408
nipkow@13781
   409
* Provers/linorder: New generic prover for transitivity reasoning over
nipkow@13781
   410
linear orders.  Note: this prover is not efficient!
nipkow@13781
   411
wenzelm@13522
   412
* Isar: preview of problems to finish 'show' now produce an error
wenzelm@13522
   413
rather than just a warning (in interactive mode);
wenzelm@13522
   414
wenzelm@13280
   415
nipkow@13158
   416
*** HOL ***
nipkow@13158
   417
nipkow@13899
   418
* arith(_tac)
nipkow@13899
   419
nipkow@13899
   420
 - Produces a counter example if it cannot prove a goal.
nipkow@13899
   421
   Note that the counter example may be spurious if the goal is not a formula
nipkow@13899
   422
   of quantifier-free linear arithmetic.
nipkow@13899
   423
   In ProofGeneral the counter example appears in the trace buffer.
nipkow@13899
   424
nipkow@13899
   425
 - Knows about div k and mod k where k is a numeral of type nat or int.
nipkow@13899
   426
nipkow@13899
   427
 - Calls full Presburger arithmetic (by Amine Chaieb) if quantifier-free
nipkow@13899
   428
   linear arithmetic fails. This takes account of quantifiers and divisibility.
wenzelm@14731
   429
   Presburger arithmetic can also be called explicitly via presburger(_tac).
nipkow@13899
   430
nipkow@13899
   431
* simp's arithmetic capabilities have been enhanced a bit: it now
nipkow@13899
   432
takes ~= in premises into account (by performing a case split);
nipkow@13899
   433
nipkow@13899
   434
* simp reduces "m*(n div m) + n mod m" to n, even if the two summands
nipkow@13899
   435
are distributed over a sum of terms;
nipkow@13899
   436
ballarin@13735
   437
* New tactic "trans_tac" and method "trans" instantiate
ballarin@13735
   438
Provers/linorder.ML for axclasses "order" and "linorder" (predicates
wenzelm@14731
   439
"<=", "<" and "=").
wenzelm@14731
   440
wenzelm@14731
   441
* function INCOMPATIBILITIES: Pi-sets have been redefined and moved from main
paulson@13587
   442
HOL to Library/FuncSet; constant "Fun.op o" is now called "Fun.comp";
paulson@13587
   443
wenzelm@13443
   444
* 'typedef' command has new option "open" to suppress the set
wenzelm@13443
   445
definition;
wenzelm@13443
   446
wenzelm@13522
   447
* functions Min and Max on finite sets have been introduced (theory
wenzelm@13522
   448
Finite_Set);
nipkow@13492
   449
wenzelm@13443
   450
* attribute [symmetric] now works for relations as well; it turns
wenzelm@13443
   451
(x,y) : R^-1 into (y,x) : R, and vice versa;
wenzelm@13443
   452
nipkow@13613
   453
* induct over a !!-quantified statement (say !!x1..xn):
nipkow@13613
   454
  each "case" automatically performs "fix x1 .. xn" with exactly those names.
nipkow@13613
   455
nipkow@13899
   456
* Map: `empty' is no longer a constant but a syntactic abbreviation for
nipkow@13899
   457
%x. None. Warning: empty_def now refers to the previously hidden definition
nipkow@13899
   458
of the empty set.
nipkow@13899
   459
ballarin@14018
   460
* Algebra: formalization of classical algebra.  Intended as base for
ballarin@14018
   461
any algebraic development in Isabelle.  Currently covers group theory
ballarin@14018
   462
(up to Sylow's theorem) and ring theory (Universal Property of
ballarin@14018
   463
Univariate Polynomials).  Contributions welcome;
paulson@13960
   464
paulson@13960
   465
* GroupTheory: deleted, since its material has been moved to Algebra;
paulson@13960
   466
wenzelm@14731
   467
* Complex: new directory of the complex numbers with numeric constants,
wenzelm@14731
   468
nonstandard complex numbers, and some complex analysis, standard and
paulson@13966
   469
nonstandard (Jacques Fleuriot);
paulson@13966
   470
paulson@13966
   471
* HOL-Complex: new image for analysis, replacing HOL-Real and HOL-Hyperreal;
paulson@13966
   472
wenzelm@14731
   473
* Hyperreal: introduced Gauge integration and hyperreal logarithms (Jacques
paulson@13966
   474
Fleuriot);
paulson@13960
   475
wenzelm@13549
   476
* Real/HahnBanach: updated and adapted to locales;
wenzelm@13549
   477
ballarin@13995
   478
* NumberTheory: added Gauss's law of quadratic reciprocity (by Avigad,
ballarin@13995
   479
Gray and Kramer);
paulson@13872
   480
paulson@13872
   481
* UNITY: added the Meier-Sanders theory of progress sets;
paulson@13872
   482
kleing@14011
   483
* MicroJava: bytecode verifier and lightweight bytecode verifier
kleing@14011
   484
as abstract algorithms, instantiated to the JVM;
kleing@14011
   485
schirmer@14010
   486
* Bali: Java source language formalization. Type system, operational
schirmer@14010
   487
semantics, axiomatic semantics. Supported language features:
schirmer@14010
   488
classes, interfaces, objects,virtual methods, static methods,
schirmer@14010
   489
static/instance fields, arrays, access modifiers, definite
schirmer@14010
   490
assignment, exceptions.
wenzelm@13549
   491
kleing@14011
   492
wenzelm@13549
   493
*** ZF ***
wenzelm@13549
   494
wenzelm@13549
   495
* ZF/Constructible: consistency proof for AC (Gödel's constructible
wenzelm@13549
   496
universe, etc.);
wenzelm@13549
   497
paulson@13872
   498
* Main ZF: virtually all theories converted to new-style format;
nipkow@13518
   499
wenzelm@13280
   500
wenzelm@13478
   501
*** ML ***
wenzelm@13478
   502
wenzelm@13478
   503
* Pure: Tactic.prove provides sane interface for internal proofs;
wenzelm@13478
   504
omits the infamous "standard" operation, so this is more appropriate
wenzelm@13478
   505
than prove_goalw_cterm in many situations (e.g. in simprocs);
wenzelm@13478
   506
wenzelm@13478
   507
* Pure: improved error reporting of simprocs;
wenzelm@13478
   508
wenzelm@13478
   509
* Provers: Simplifier.simproc(_i) provides sane interface for setting
wenzelm@13478
   510
up simprocs;
wenzelm@13478
   511
wenzelm@13478
   512
kleing@13953
   513
*** Document preparation ***
kleing@13953
   514
kleing@13953
   515
* uses \par instead of \\ for line breaks in theory text. This may
kleing@13953
   516
shift some page breaks in large documents. To get the old behaviour
kleing@13953
   517
use \renewcommand{\isanewline}{\mbox{}\\\mbox{}} in root.tex.
kleing@13953
   518
wenzelm@14731
   519
* minimized dependencies of isabelle.sty and isabellesym.sty on
kleing@13953
   520
other packages
kleing@13953
   521
kleing@13953
   522
* \<euro> now needs package babel/greek instead of marvosym (which
kleing@13953
   523
broke \Rightarrow)
kleing@13953
   524
wenzelm@14731
   525
* normal size for \<zero>...\<nine> (uses \mathbf instead of
kleing@13954
   526
textcomp package)
kleing@13953
   527
wenzelm@13280
   528
wenzelm@14572
   529
wenzelm@12984
   530
New in Isabelle2002 (March 2002)
wenzelm@12984
   531
--------------------------------
wenzelm@11474
   532
wenzelm@11572
   533
*** Document preparation ***
wenzelm@11572
   534
wenzelm@11842
   535
* greatly simplified document preparation setup, including more
wenzelm@11842
   536
graceful interpretation of isatool usedir -i/-d/-D options, and more
wenzelm@11842
   537
instructive isatool mkdir; users should basically be able to get
wenzelm@12899
   538
started with "isatool mkdir HOL Test && isatool make"; alternatively,
wenzelm@12899
   539
users may run a separate document processing stage manually like this:
wenzelm@12899
   540
"isatool usedir -D output HOL Test && isatool document Test/output";
wenzelm@11842
   541
wenzelm@11842
   542
* theory dependency graph may now be incorporated into documents;
wenzelm@11842
   543
isatool usedir -g true will produce session_graph.eps/.pdf for use
wenzelm@11842
   544
with \includegraphics of LaTeX;
wenzelm@11842
   545
wenzelm@11864
   546
* proper spacing of consecutive markup elements, especially text
wenzelm@11864
   547
blocks after section headings;
wenzelm@11864
   548
wenzelm@11572
   549
* support bold style (for single symbols only), input syntax is like
wenzelm@11572
   550
this: "\<^bold>\<alpha>" or "\<^bold>A";
wenzelm@11572
   551
wenzelm@11814
   552
* \<bullet> is now output as bold \cdot by default, which looks much
wenzelm@11572
   553
better in printed text;
wenzelm@11572
   554
wenzelm@11712
   555
* added default LaTeX bindings for \<tturnstile> and \<TTurnstile>;
wenzelm@11712
   556
note that these symbols are currently unavailable in Proof General /
wenzelm@12769
   557
X-Symbol; new symbols \<zero>, \<one>, ..., \<nine>, and \<euro>;
wenzelm@12690
   558
wenzelm@12690
   559
* isatool latex no longer depends on changed TEXINPUTS, instead
wenzelm@12690
   560
isatool document copies the Isabelle style files to the target
wenzelm@12690
   561
location;
wenzelm@11712
   562
wenzelm@11572
   563
wenzelm@11633
   564
*** Isar ***
wenzelm@11633
   565
wenzelm@12312
   566
* Pure/Provers: improved proof by cases and induction;
wenzelm@12280
   567
  - 'case' command admits impromptu naming of parameters (such as
wenzelm@12280
   568
    "case (Suc n)");
wenzelm@12280
   569
  - 'induct' method divinates rule instantiation from the inductive
wenzelm@12280
   570
    claim; no longer requires excessive ?P bindings for proper
wenzelm@12280
   571
    instantiation of cases;
wenzelm@12280
   572
  - 'induct' method properly enumerates all possibilities of set/type
wenzelm@12280
   573
    rules; as a consequence facts may be also passed through *type*
wenzelm@12280
   574
    rules without further ado;
wenzelm@12280
   575
  - 'induct' method now derives symbolic cases from the *rulified*
wenzelm@12280
   576
    rule (before it used to rulify cases stemming from the internal
wenzelm@12280
   577
    atomized version); this means that the context of a non-atomic
wenzelm@12280
   578
    statement becomes is included in the hypothesis, avoiding the
wenzelm@12280
   579
    slightly cumbersome show "PROP ?case" form;
wenzelm@12280
   580
  - 'induct' may now use elim-style induction rules without chaining
wenzelm@12280
   581
    facts, using ``missing'' premises from the goal state; this allows
wenzelm@12280
   582
    rules stemming from inductive sets to be applied in unstructured
wenzelm@12280
   583
    scripts, while still benefitting from proper handling of non-atomic
wenzelm@12280
   584
    statements; NB: major inductive premises need to be put first, all
wenzelm@12280
   585
    the rest of the goal is passed through the induction;
wenzelm@12280
   586
  - 'induct' proper support for mutual induction involving non-atomic
wenzelm@12280
   587
    rule statements (uses the new concept of simultaneous goals, see
wenzelm@12280
   588
    below);
wenzelm@12853
   589
  - append all possible rule selections, but only use the first
wenzelm@12853
   590
    success (no backtracking);
wenzelm@11995
   591
  - removed obsolete "(simplified)" and "(stripped)" options of methods;
wenzelm@12754
   592
  - undeclared rule case names default to numbers 1, 2, 3, ...;
wenzelm@12754
   593
  - added 'print_induct_rules' (covered by help item in recent Proof
wenzelm@12754
   594
    General versions);
wenzelm@11995
   595
  - moved induct/cases attributes to Pure, methods to Provers;
wenzelm@11995
   596
  - generic method setup instantiated for FOL and HOL;
wenzelm@11986
   597
wenzelm@12163
   598
* Pure: support multiple simultaneous goal statements, for example
wenzelm@12163
   599
"have a: A and b: B" (same for 'theorem' etc.); being a pure
wenzelm@12163
   600
meta-level mechanism, this acts as if several individual goals had
wenzelm@12163
   601
been stated separately; in particular common proof methods need to be
wenzelm@12163
   602
repeated in order to cover all claims; note that a single elimination
wenzelm@12163
   603
step is *not* sufficient to establish the two conjunctions, so this
wenzelm@12163
   604
fails:
wenzelm@12163
   605
wenzelm@12163
   606
  assume "A & B" then have A and B ..   (*".." fails*)
wenzelm@12163
   607
wenzelm@12163
   608
better use "obtain" in situations as above; alternative refer to
wenzelm@12163
   609
multi-step methods like 'auto', 'simp_all', 'blast+' etc.;
wenzelm@12163
   610
wenzelm@12078
   611
* Pure: proper integration with ``locales''; unlike the original
wenzelm@12210
   612
version by Florian Kammüller, Isar locales package high-level proof
wenzelm@12078
   613
contexts rather than raw logical ones (e.g. we admit to include
wenzelm@12280
   614
attributes everywhere); operations on locales include merge and
wenzelm@12964
   615
rename; support for implicit arguments (``structures''); simultaneous
wenzelm@12964
   616
type-inference over imports and text; see also HOL/ex/Locales.thy for
wenzelm@12964
   617
some examples;
wenzelm@12078
   618
wenzelm@12707
   619
* Pure: the following commands have been ``localized'', supporting a
wenzelm@12707
   620
target locale specification "(in name)": 'lemma', 'theorem',
wenzelm@12707
   621
'corollary', 'lemmas', 'theorems', 'declare'; the results will be
wenzelm@12707
   622
stored both within the locale and at the theory level (exported and
wenzelm@12707
   623
qualified by the locale name);
wenzelm@12707
   624
wenzelm@12964
   625
* Pure: theory goals may now be specified in ``long'' form, with
wenzelm@12964
   626
ad-hoc contexts consisting of arbitrary locale elements. for example
wenzelm@12964
   627
``lemma foo: fixes x assumes "A x" shows "B x"'' (local syntax and
wenzelm@12964
   628
definitions may be given, too); the result is a meta-level rule with
wenzelm@12964
   629
the context elements being discharged in the obvious way;
wenzelm@12964
   630
wenzelm@12964
   631
* Pure: new proof command 'using' allows to augment currently used
wenzelm@12964
   632
facts after a goal statement ('using' is syntactically analogous to
wenzelm@12964
   633
'apply', but acts on the goal's facts only); this allows chained facts
wenzelm@12964
   634
to be separated into parts given before and after a claim, as in
wenzelm@12964
   635
``from a and b have C using d and e <proof>'';
wenzelm@12078
   636
wenzelm@11722
   637
* Pure: renamed "antecedent" case to "rule_context";
wenzelm@11722
   638
wenzelm@12964
   639
* Pure: new 'judgment' command records explicit information about the
wenzelm@12964
   640
object-logic embedding (used by several tools internally); no longer
wenzelm@12964
   641
use hard-wired "Trueprop";
wenzelm@12964
   642
wenzelm@11738
   643
* Pure: added 'corollary' command;
wenzelm@11738
   644
wenzelm@11722
   645
* Pure: fixed 'token_translation' command;
wenzelm@11722
   646
wenzelm@11899
   647
* Pure: removed obsolete 'exported' attribute;
wenzelm@11899
   648
wenzelm@11933
   649
* Pure: dummy pattern "_" in is/let is now automatically lifted over
wenzelm@11933
   650
bound variables: "ALL x. P x --> Q x" (is "ALL x. _ --> ?C x")
wenzelm@11899
   651
supersedes more cumbersome ... (is "ALL x. _ x --> ?C x");
wenzelm@11899
   652
wenzelm@11952
   653
* Pure: method 'atomize' presents local goal premises as object-level
wenzelm@11952
   654
statements (atomic meta-level propositions); setup controlled via
wenzelm@11952
   655
rewrite rules declarations of 'atomize' attribute; example
wenzelm@11952
   656
application: 'induct' method with proper rule statements in improper
wenzelm@11952
   657
proof *scripts*;
wenzelm@11952
   658
wenzelm@12106
   659
* Pure: emulation of instantiation tactics (rule_tac, cut_tac, etc.)
wenzelm@12106
   660
now consider the syntactic context of assumptions, giving a better
wenzelm@12106
   661
chance to get type-inference of the arguments right (this is
wenzelm@12106
   662
especially important for locales);
wenzelm@12106
   663
wenzelm@12312
   664
* Pure: "sorry" no longer requires quick_and_dirty in interactive
wenzelm@12312
   665
mode;
wenzelm@12312
   666
wenzelm@12405
   667
* Pure/obtain: the formal conclusion "thesis", being marked as
wenzelm@12405
   668
``internal'', may no longer be reference directly in the text;
wenzelm@12405
   669
potential INCOMPATIBILITY, may need to use "?thesis" in rare
wenzelm@12405
   670
situations;
wenzelm@12405
   671
wenzelm@12405
   672
* Pure: generic 'sym' attribute which declares a rule both as pure
wenzelm@12405
   673
'elim?' and for the 'symmetric' operation;
wenzelm@12405
   674
wenzelm@12877
   675
* Pure: marginal comments ``--'' may now occur just anywhere in the
wenzelm@12877
   676
text; the fixed correlation with particular command syntax has been
wenzelm@12877
   677
discontinued;
wenzelm@12877
   678
berghofe@13023
   679
* Pure: new method 'rules' is particularly well-suited for proof
berghofe@13023
   680
search in intuitionistic logic; a bit slower than 'blast' or 'fast',
berghofe@13023
   681
but often produces more compact proof terms with less detours;
berghofe@13023
   682
wenzelm@12364
   683
* Pure/Provers/classical: simplified integration with pure rule
wenzelm@12364
   684
attributes and methods; the classical "intro?/elim?/dest?"
wenzelm@12364
   685
declarations coincide with the pure ones; the "rule" method no longer
wenzelm@12364
   686
includes classically swapped intros; "intro" and "elim" methods no
wenzelm@12364
   687
longer pick rules from the context; also got rid of ML declarations
wenzelm@12364
   688
AddXIs/AddXEs/AddXDs; all of this has some potential for
wenzelm@12364
   689
INCOMPATIBILITY;
wenzelm@12364
   690
wenzelm@12405
   691
* Provers/classical: attribute 'swapped' produces classical inversions
wenzelm@12405
   692
of introduction rules;
wenzelm@12405
   693
wenzelm@12364
   694
* Provers/simplifier: 'simplified' attribute may refer to explicit
wenzelm@12364
   695
rules instead of full simplifier context; 'iff' attribute handles
wenzelm@12364
   696
conditional rules;
wenzelm@11936
   697
wenzelm@11745
   698
* HOL: 'typedef' now allows alternative names for Rep/Abs morphisms;
wenzelm@11745
   699
wenzelm@11690
   700
* HOL: 'recdef' now fails on unfinished automated proofs, use
wenzelm@11633
   701
"(permissive)" option to recover old behavior;
wenzelm@11633
   702
wenzelm@11933
   703
* HOL: 'inductive' no longer features separate (collective) attributes
wenzelm@11933
   704
for 'intros' (was found too confusing);
wenzelm@11933
   705
wenzelm@12405
   706
* HOL: properly declared induction rules less_induct and
wenzelm@12405
   707
wf_induct_rule;
wenzelm@12405
   708
kleing@11788
   709
wenzelm@11474
   710
*** HOL ***
wenzelm@11474
   711
wenzelm@11702
   712
* HOL: moved over to sane numeral syntax; the new policy is as
wenzelm@11702
   713
follows:
wenzelm@11702
   714
wenzelm@11702
   715
  - 0 and 1 are polymorphic constants, which are defined on any
wenzelm@11702
   716
  numeric type (nat, int, real etc.);
wenzelm@11702
   717
wenzelm@11702
   718
  - 2, 3, 4, ... and -1, -2, -3, ... are polymorphic numerals, based
wenzelm@11702
   719
  binary representation internally;
wenzelm@11702
   720
wenzelm@11702
   721
  - type nat has special constructor Suc, and generally prefers Suc 0
wenzelm@11702
   722
  over 1::nat and Suc (Suc 0) over 2::nat;
wenzelm@11702
   723
wenzelm@12364
   724
This change may cause significant problems of INCOMPATIBILITY; here
wenzelm@12364
   725
are some hints on converting existing sources:
wenzelm@11702
   726
wenzelm@11702
   727
  - due to the new "num" token, "-0" and "-1" etc. are now atomic
wenzelm@11702
   728
  entities, so expressions involving "-" (unary or binary minus) need
wenzelm@11702
   729
  to be spaced properly;
wenzelm@11702
   730
wenzelm@11702
   731
  - existing occurrences of "1" may need to be constraint "1::nat" or
wenzelm@11702
   732
  even replaced by Suc 0; similar for old "2";
wenzelm@11702
   733
wenzelm@11702
   734
  - replace "#nnn" by "nnn", and "#-nnn" by "-nnn";
wenzelm@11702
   735
wenzelm@11702
   736
  - remove all special provisions on numerals in proofs;
wenzelm@11702
   737
wenzelm@13042
   738
* HOL: simp rules nat_number expand numerals on nat to Suc/0
wenzelm@12837
   739
representation (depends on bin_arith_simps in the default context);
wenzelm@12837
   740
wenzelm@12736
   741
* HOL: symbolic syntax for x^2 (numeral 2);
wenzelm@12736
   742
wenzelm@12335
   743
* HOL: the class of all HOL types is now called "type" rather than
wenzelm@12335
   744
"term"; INCOMPATIBILITY, need to adapt references to this type class
wenzelm@12335
   745
in axclass/classes, instance/arities, and (usually rare) occurrences
wenzelm@12335
   746
in typings (of consts etc.); internally the class is called
wenzelm@12335
   747
"HOL.type", ML programs should refer to HOLogic.typeS;
wenzelm@12335
   748
wenzelm@12280
   749
* HOL/record package improvements:
wenzelm@12280
   750
  - new derived operations "fields" to build a partial record section,
wenzelm@12280
   751
    "extend" to promote a fixed record to a record scheme, and
wenzelm@12280
   752
    "truncate" for the reverse; cf. theorems "xxx.defs", which are *not*
wenzelm@12280
   753
    declared as simp by default;
wenzelm@12587
   754
  - shared operations ("more", "fields", etc.) now need to be always
wenzelm@12587
   755
    qualified) --- potential INCOMPATIBILITY;
wenzelm@12280
   756
  - removed "make_scheme" operations (use "make" with "extend") --
wenzelm@12280
   757
    INCOMPATIBILITY;
wenzelm@11937
   758
  - removed "more" class (simply use "term") -- INCOMPATIBILITY;
wenzelm@12253
   759
  - provides cases/induct rules for use with corresponding Isar
wenzelm@12253
   760
    methods (for concrete records, record schemes, concrete more
wenzelm@12280
   761
    parts, and schematic more parts -- in that order);
wenzelm@11930
   762
  - internal definitions directly based on a light-weight abstract
wenzelm@11930
   763
    theory of product types over typedef rather than datatype;
wenzelm@11930
   764
berghofe@13023
   765
* HOL: generic code generator for generating executable ML code from
berghofe@13023
   766
specifications; specific support for HOL constructs such as inductive
berghofe@13023
   767
datatypes and sets, as well as recursive functions; can be invoked
berghofe@13023
   768
via 'generate_code' theory section;
berghofe@13023
   769
wenzelm@11933
   770
* HOL: canonical cases/induct rules for n-tuples (n = 3..7);
wenzelm@11933
   771
paulson@13824
   772
* HOL: consolidated and renamed several theories.  In particular:
wenzelm@14731
   773
        Ord.thy has been absorbed into HOL.thy
wenzelm@14731
   774
        String.thy has been absorbed into List.thy
wenzelm@14731
   775
wenzelm@11802
   776
* HOL: concrete setsum syntax "\<Sum>i:A. b" == "setsum (%i. b) A"
wenzelm@11802
   777
(beware of argument permutation!);
wenzelm@11802
   778
wenzelm@11657
   779
* HOL: linorder_less_split superseded by linorder_cases;
wenzelm@11657
   780
wenzelm@12917
   781
* HOL/List: "nodups" renamed to "distinct";
nipkow@12889
   782
wenzelm@11633
   783
* HOL: added "The" definite description operator; move Hilbert's "Eps"
paulson@13824
   784
to peripheral theory "Hilbert_Choice"; some INCOMPATIBILITIES:
paulson@13824
   785
  - Ex_def has changed, now need to use some_eq_ex
wenzelm@11437
   786
wenzelm@11572
   787
* HOL: made split_all_tac safe; EXISTING PROOFS MAY FAIL OR LOOP, so
wenzelm@11572
   788
in this (rare) case use:
wenzelm@11572
   789
wenzelm@11572
   790
  delSWrapper "split_all_tac"
wenzelm@11572
   791
  addSbefore ("unsafe_split_all_tac", unsafe_split_all_tac)
wenzelm@11572
   792
wenzelm@11572
   793
* HOL: added safe wrapper "split_conv_tac" to claset; EXISTING PROOFS
wenzelm@11474
   794
MAY FAIL;
nipkow@11361
   795
wenzelm@11572
   796
* HOL: introduced f^n = f o ... o f; warning: due to the limits of
wenzelm@11572
   797
Isabelle's type classes, ^ on functions and relations has too general
wenzelm@11572
   798
a domain, namely ('a * 'b) set and 'a => 'b; this means that it may be
wenzelm@11572
   799
necessary to attach explicit type constraints;
nipkow@11307
   800
wenzelm@12917
   801
* HOL/Relation: the prefix name of the infix "O" has been changed from
wenzelm@12917
   802
"comp" to "rel_comp"; INCOMPATIBILITY: a few theorems have been
wenzelm@12917
   803
renamed accordingly (eg "compI" -> "rel_compI").
nipkow@12489
   804
wenzelm@11487
   805
* HOL: syntax translations now work properly with numerals and records
wenzelm@11487
   806
expressions;
wenzelm@11474
   807
wenzelm@12457
   808
* HOL: bounded abstraction now uses syntax "%" / "\<lambda>" instead
wenzelm@12457
   809
of "lam" -- INCOMPATIBILITY;
wenzelm@11474
   810
wenzelm@11933
   811
* HOL: got rid of some global declarations (potential INCOMPATIBILITY
wenzelm@11933
   812
for ML tools): const "()" renamed "Product_Type.Unity", type "unit"
wenzelm@11933
   813
renamed "Product_Type.unit";
wenzelm@11611
   814
nipkow@12564
   815
* HOL: renamed rtrancl_into_rtrancl2 to converse_rtrancl_into_rtrancl
nipkow@12564
   816
wenzelm@12924
   817
* HOL: removed obsolete theorem "optionE" (use "option.exhaust", or
wenzelm@12924
   818
the "cases" method);
wenzelm@12924
   819
wenzelm@12597
   820
* HOL/GroupTheory: group theory examples including Sylow's theorem (by
wenzelm@12597
   821
Florian Kammüller);
wenzelm@12597
   822
wenzelm@12608
   823
* HOL/IMP: updated and converted to new-style theory format; several
wenzelm@12608
   824
parts turned into readable document, with proper Isar proof texts and
wenzelm@12608
   825
some explanations (by Gerwin Klein);
wenzelm@12597
   826
wenzelm@12734
   827
* HOL-Real: added Complex_Numbers (by Gertrud Bauer);
wenzelm@12734
   828
wenzelm@12690
   829
* HOL-Hyperreal is now a logic image;
wenzelm@12690
   830
wenzelm@11611
   831
wenzelm@12022
   832
*** HOLCF ***
wenzelm@12022
   833
wenzelm@12622
   834
* Isar: consts/constdefs supports mixfix syntax for continuous
wenzelm@12622
   835
operations;
wenzelm@12622
   836
wenzelm@12622
   837
* Isar: domain package adapted to new-style theory format, e.g. see
wenzelm@12622
   838
HOLCF/ex/Dnat.thy;
wenzelm@12622
   839
wenzelm@12622
   840
* theory Lift: proper use of rep_datatype lift instead of ML hacks --
wenzelm@12280
   841
potential INCOMPATIBILITY; now use plain induct_tac instead of former
wenzelm@12280
   842
lift.induct_tac, always use UU instead of Undef;
wenzelm@12022
   843
wenzelm@12597
   844
* HOLCF/IMP: updated and converted to new-style theory;
wenzelm@12597
   845
wenzelm@12022
   846
wenzelm@11474
   847
*** ZF ***
wenzelm@11474
   848
wenzelm@12622
   849
* Isar: proper integration of logic-specific tools and packages,
wenzelm@12622
   850
including theory commands '(co)inductive', '(co)datatype',
wenzelm@12622
   851
'rep_datatype', 'inductive_cases', as well as methods 'ind_cases',
wenzelm@12622
   852
'induct_tac', 'case_tac', and 'typecheck' (with attribute 'TC');
wenzelm@12622
   853
wenzelm@12622
   854
* theory Main no longer includes AC; for the Axiom of Choice, base
wenzelm@12622
   855
your theory on Main_ZFC;
wenzelm@12622
   856
wenzelm@12622
   857
* the integer library now covers quotients and remainders, with many
wenzelm@12622
   858
laws relating division to addition, multiplication, etc.;
paulson@12563
   859
wenzelm@12280
   860
* ZF/UNITY: Chandy and Misra's UNITY is now available in ZF, giving a
wenzelm@12280
   861
typeless version of the formalism;
wenzelm@12280
   862
wenzelm@13025
   863
* ZF/AC, Coind, IMP, Resid: updated and converted to new-style theory
wenzelm@13025
   864
format;
wenzelm@12608
   865
wenzelm@12280
   866
* ZF/Induct: new directory for examples of inductive definitions,
wenzelm@12608
   867
including theory Multiset for multiset orderings; converted to
wenzelm@12608
   868
new-style theory format;
wenzelm@12177
   869
wenzelm@13025
   870
* ZF: many new theorems about lists, ordinals, etc.;
paulson@12850
   871
wenzelm@11474
   872
wenzelm@11474
   873
*** General ***
wenzelm@11474
   874
wenzelm@12280
   875
* Pure/kernel: meta-level proof terms (by Stefan Berghofer); reference
wenzelm@12280
   876
variable proof controls level of detail: 0 = no proofs (only oracle
wenzelm@12280
   877
dependencies), 1 = lemma dependencies, 2 = compact proof terms; see
wenzelm@12280
   878
also ref manual for further ML interfaces;
wenzelm@12280
   879
wenzelm@12280
   880
* Pure/axclass: removed obsolete ML interface
wenzelm@12280
   881
goal_subclass/goal_arity;
wenzelm@12280
   882
wenzelm@12280
   883
* Pure/syntax: new token syntax "num" for plain numerals (without "#"
wenzelm@12280
   884
of "xnum"); potential INCOMPATIBILITY, since -0, -1 etc. are now
wenzelm@12280
   885
separate tokens, so expressions involving minus need to be spaced
wenzelm@12280
   886
properly;
wenzelm@12280
   887
wenzelm@12312
   888
* Pure/syntax: support non-oriented infixes, using keyword "infix"
wenzelm@12312
   889
rather than "infixl" or "infixr";
wenzelm@12312
   890
wenzelm@12312
   891
* Pure/syntax: concrete syntax for dummy type variables admits genuine
wenzelm@12312
   892
sort constraint specifications in type inference; e.g. "x::_::foo"
wenzelm@12312
   893
ensures that the type of "x" is of sort "foo" (but not necessarily a
wenzelm@12312
   894
type variable);
wenzelm@12280
   895
wenzelm@12280
   896
* Pure/syntax: print modes "type_brackets" and "no_type_brackets"
wenzelm@12280
   897
control output of nested => (types); the default behavior is
wenzelm@12280
   898
"type_brackets";
wenzelm@12280
   899
wenzelm@12280
   900
* Pure/syntax: builtin parse translation for "_constify" turns valued
wenzelm@11817
   901
tokens into AST constants;
wenzelm@11474
   902
wenzelm@12280
   903
* Pure/syntax: prefer later declarations of translations and print
wenzelm@12280
   904
translation functions; potential INCOMPATIBILITY: need to reverse
wenzelm@12280
   905
multiple declarations for same syntax element constant;
wenzelm@12280
   906
wenzelm@12832
   907
* Pure/show_hyps reset by default (in accordance to existing Isar
wenzelm@12832
   908
practice);
wenzelm@12832
   909
wenzelm@12280
   910
* Provers/classical: renamed addaltern to addafter, addSaltern to
wenzelm@12280
   911
addSafter;
wenzelm@12280
   912
wenzelm@12280
   913
* Provers/clasimp: ``iff'' declarations now handle conditional rules
wenzelm@12280
   914
as well;
wenzelm@12253
   915
wenzelm@12538
   916
* system: tested support for MacOS X; should be able to get Isabelle +
wenzelm@12538
   917
Proof General to work in a plain Terminal after installing Poly/ML
wenzelm@12538
   918
(e.g. from the Isabelle distribution area) and GNU bash alone
wenzelm@12538
   919
(e.g. from http://www.apple.com); full X11, XEmacs and X-Symbol
wenzelm@12538
   920
support requires further installations, e.g. from
wenzelm@12538
   921
http://fink.sourceforge.net/);
wenzelm@12538
   922
wenzelm@12280
   923
* system: support Poly/ML 4.1.1 (able to manage larger heaps);
wenzelm@11551
   924
wenzelm@12753
   925
* system: reduced base memory usage by Poly/ML (approx. 20 MB instead
wenzelm@12753
   926
of 40 MB), cf. ML_OPTIONS;
wenzelm@12753
   927
wenzelm@11633
   928
* system: Proof General keywords specification is now part of the
wenzelm@11633
   929
Isabelle distribution (see etc/isar-keywords.el);
wenzelm@11633
   930
wenzelm@12728
   931
* system: support for persistent Proof General sessions (refrain from
wenzelm@12728
   932
outdating all loaded theories on startup); user may create writable
wenzelm@12728
   933
logic images like this: ``isabelle -q HOL Test'';
wenzelm@12597
   934
wenzelm@11551
   935
* system: smart selection of Isabelle process versus Isabelle
wenzelm@11572
   936
interface, accommodates case-insensitive file systems (e.g. HFS+); may
wenzelm@11572
   937
run both "isabelle" and "Isabelle" even if file names are badly
wenzelm@11572
   938
damaged (executable inspects the case of the first letter of its own
wenzelm@11572
   939
name); added separate "isabelle-process" and "isabelle-interface";
wenzelm@11551
   940
wenzelm@12472
   941
* system: refrain from any attempt at filtering input streams; no
wenzelm@12472
   942
longer support ``8bit'' encoding of old isabelle font, instead proper
wenzelm@12472
   943
iso-latin characters may now be used; the related isatools
wenzelm@12472
   944
"symbolinput" and "nonascii" have disappeared as well;
wenzelm@12472
   945
wenzelm@12472
   946
* system: removed old "xterm" interface (the print modes "xterm" and
wenzelm@12472
   947
"xterm_color" are still available for direct use in a suitable
wenzelm@12472
   948
terminal);
wenzelm@12472
   949
paulson@11314
   950
oheimb@11169
   951
wenzelm@11062
   952
New in Isabelle99-2 (February 2001)
wenzelm@11062
   953
-----------------------------------
wenzelm@11062
   954
nipkow@10224
   955
*** Overview of INCOMPATIBILITIES ***
nipkow@10224
   956
paulson@11241
   957
* HOL: please note that theories in the Library and elsewhere often use the
paulson@11241
   958
new-style (Isar) format; to refer to their theorems in an ML script you must
wenzelm@12622
   959
bind them to ML identifers by e.g.      val thm_name = thm "thm_name";
paulson@11241
   960
wenzelm@11043
   961
* HOL: inductive package no longer splits induction rule aggressively,
wenzelm@11043
   962
but only as far as specified by the introductions given; the old
oheimb@11130
   963
format may be recovered via ML function complete_split_rule or attribute
wenzelm@11043
   964
'split_rule (complete)';
wenzelm@11043
   965
wenzelm@10998
   966
* HOL: induct renamed to lfp_induct, lfp_Tarski to lfp_unfold,
wenzelm@10998
   967
gfp_Tarski to gfp_unfold;
nipkow@10224
   968
paulson@10288
   969
* HOL: contrapos, contrapos2 renamed to contrapos_nn, contrapos_pp;
paulson@10288
   970
wenzelm@10858
   971
* HOL: infix "dvd" now has priority 50 rather than 70 (because it is a
wenzelm@10858
   972
relation); infix "^^" has been renamed "``"; infix "``" has been
wenzelm@10858
   973
renamed "`"; "univalent" has been renamed "single_valued";
nipkow@10793
   974
wenzelm@10998
   975
* HOL/Real: "rinv" and "hrinv" replaced by overloaded "inverse"
wenzelm@10998
   976
operation;
wenzelm@10998
   977
nipkow@10868
   978
* HOLCF: infix "`" has been renamed "$"; the symbol syntax is \<cdot>;
nipkow@10856
   979
wenzelm@10391
   980
* Isar: 'obtain' no longer declares "that" fact as simp/intro;
wenzelm@10391
   981
wenzelm@10401
   982
* Isar/HOL: method 'induct' now handles non-atomic goals; as a
wenzelm@10401
   983
consequence, it is no longer monotonic wrt. the local goal context
wenzelm@10401
   984
(which is now passed through the inductive cases);
wenzelm@10401
   985
wenzelm@10976
   986
* Document preparation: renamed standard symbols \<ll> to \<lless> and
wenzelm@10976
   987
\<gg> to \<ggreater>;
wenzelm@10976
   988
nipkow@10224
   989
wenzelm@10245
   990
*** Document preparation ***
wenzelm@10245
   991
wenzelm@10858
   992
* \isabellestyle{NAME} selects version of Isabelle output (currently
wenzelm@10858
   993
available: are "it" for near math-mode best-style output, "sl" for
wenzelm@10858
   994
slanted text style, and "tt" for plain type-writer; if no
wenzelm@10858
   995
\isabellestyle command is given, output is according to slanted
wenzelm@10858
   996
type-writer);
wenzelm@10858
   997
wenzelm@10322
   998
* support sub/super scripts (for single symbols only), input syntax is
wenzelm@10322
   999
like this: "A\<^sup>*" or "A\<^sup>\<star>";
wenzelm@10322
  1000
wenzelm@10858
  1001
* some more standard symbols; see Appendix A of the system manual for
wenzelm@11062
  1002
the complete list of symbols defined in isabellesym.sty;
wenzelm@10858
  1003
wenzelm@10998
  1004
* improved isabelle style files; more abstract symbol implementation
wenzelm@10998
  1005
(should now use \isamath{...} and \isatext{...} in custom symbol
wenzelm@10998
  1006
definitions);
wenzelm@10998
  1007
wenzelm@10634
  1008
* antiquotation @{goals} and @{subgoals} for output of *dynamic* goals
wenzelm@10634
  1009
state; Note that presentation of goal states does not conform to
wenzelm@10634
  1010
actual human-readable proof documents.  Please do not include goal
wenzelm@10634
  1011
states into document output unless you really know what you are doing!
wenzelm@10322
  1012
wenzelm@11062
  1013
* proper indentation of antiquoted output with proportional LaTeX
wenzelm@11062
  1014
fonts;
wenzelm@10862
  1015
wenzelm@11050
  1016
* no_document ML operator temporarily disables LaTeX document
wenzelm@11050
  1017
generation;
wenzelm@11050
  1018
wenzelm@11062
  1019
* isatool unsymbolize tunes sources for plain ASCII communication;
wenzelm@11062
  1020
wenzelm@10322
  1021
wenzelm@10306
  1022
*** Isar ***
wenzelm@10306
  1023
wenzelm@10547
  1024
* Pure: Isar now suffers initial goal statements to contain unbound
wenzelm@10547
  1025
schematic variables (this does not conform to actual readable proof
wenzelm@10547
  1026
documents, due to unpredictable outcome and non-compositional proof
wenzelm@10547
  1027
checking); users who know what they are doing may use schematic goals
wenzelm@10547
  1028
for Prolog-style synthesis of proven results;
wenzelm@10547
  1029
wenzelm@10391
  1030
* Pure: assumption method (an implicit finishing) now handles actual
wenzelm@10391
  1031
rules as well;
wenzelm@10391
  1032
wenzelm@10391
  1033
* Pure: improved 'obtain' --- moved to Pure, insert "that" into
wenzelm@10391
  1034
initial goal, declare "that" only as Pure intro (only for single
wenzelm@10391
  1035
steps); the "that" rule assumption may now be involved in implicit
wenzelm@10391
  1036
finishing, thus ".." becomes a feasible for trivial obtains;
wenzelm@10391
  1037
wenzelm@10391
  1038
* Pure: default proof step now includes 'intro_classes'; thus trivial
wenzelm@10391
  1039
instance proofs may be performed by "..";
wenzelm@10391
  1040
wenzelm@10391
  1041
* Pure: ?thesis / ?this / "..." now work for pure meta-level
wenzelm@10391
  1042
statements as well;
wenzelm@10306
  1043
wenzelm@11097
  1044
* Pure: more robust selection of calculational rules;
wenzelm@11097
  1045
wenzelm@10858
  1046
* Pure: the builtin notion of 'finished' goal now includes the ==-refl
wenzelm@10858
  1047
rule (as well as the assumption rule);
wenzelm@10858
  1048
wenzelm@10858
  1049
* Pure: 'thm_deps' command visualizes dependencies of theorems and
wenzelm@10858
  1050
lemmas, using the graph browser tool;
wenzelm@10858
  1051
wenzelm@10944
  1052
* Pure: predict failure of "show" in interactive mode;
wenzelm@10944
  1053
wenzelm@11016
  1054
* Pure: 'thms_containing' now takes actual terms as arguments;
wenzelm@11016
  1055
wenzelm@10401
  1056
* HOL: improved method 'induct' --- now handles non-atomic goals
wenzelm@10401
  1057
(potential INCOMPATIBILITY); tuned error handling;
wenzelm@10401
  1058
wenzelm@10557
  1059
* HOL: cases and induct rules now provide explicit hints about the
wenzelm@10547
  1060
number of facts to be consumed (0 for "type" and 1 for "set" rules);
wenzelm@10547
  1061
any remaining facts are inserted into the goal verbatim;
wenzelm@10547
  1062
wenzelm@10858
  1063
* HOL: local contexts (aka cases) may now contain term bindings as
wenzelm@10858
  1064
well; the 'cases' and 'induct' methods new provide a ?case binding for
wenzelm@10858
  1065
the result to be shown in each case;
wenzelm@10858
  1066
wenzelm@10770
  1067
* HOL: added 'recdef_tc' command;
wenzelm@10770
  1068
wenzelm@11016
  1069
* isatool convert assists in eliminating legacy ML scripts;
wenzelm@11016
  1070
wenzelm@10306
  1071
wenzelm@10245
  1072
*** HOL ***
wenzelm@10245
  1073
wenzelm@10245
  1074
* HOL/Library: a collection of generic theories to be used together
wenzelm@10245
  1075
with main HOL; the theory loader path already includes this directory
wenzelm@10245
  1076
by default; the following existing theories have been moved here:
wenzelm@10245
  1077
HOL/Induct/Multiset, HOL/Induct/Acc (as Accessible_Part), HOL/While
wenzelm@10337
  1078
(as While_Combinator), HOL/Lex/Prefix (as List_Prefix);
wenzelm@10245
  1079
wenzelm@10966
  1080
* HOL/Unix: "Some aspects of Unix file-system security", a typical
wenzelm@10966
  1081
modelling and verification task performed in Isabelle/HOL +
wenzelm@10966
  1082
Isabelle/Isar + Isabelle document preparation (by Markus Wenzel).
wenzelm@10966
  1083
wenzelm@11094
  1084
* HOL/Algebra: special summation operator SUM no longer exists, it has
wenzelm@11094
  1085
been replaced by setsum; infix 'assoc' now has priority 50 (like
wenzelm@11094
  1086
'dvd'); axiom 'one_not_zero' has been moved from axclass 'ring' to
wenzelm@11094
  1087
'domain', this makes the theory consistent with mathematical
wenzelm@11094
  1088
literature;
wenzelm@11094
  1089
wenzelm@10514
  1090
* HOL basics: added overloaded operations "inverse" and "divide"
wenzelm@10726
  1091
(infix "/"), syntax for generic "abs" operation, generic summation
wenzelm@11094
  1092
operator \<Sum>;
wenzelm@10452
  1093
wenzelm@10391
  1094
* HOL/typedef: simplified package, provide more useful rules (see also
wenzelm@10391
  1095
HOL/subset.thy);
wenzelm@10391
  1096
wenzelm@10915
  1097
* HOL/datatype: induction rule for arbitrarily branching datatypes is
wenzelm@10915
  1098
now expressed as a proper nested rule (old-style tactic scripts may
wenzelm@10915
  1099
require atomize_strip_tac to cope with non-atomic premises);
wenzelm@10915
  1100
wenzelm@10915
  1101
* HOL: renamed theory "Prod" to "Product_Type", renamed "split" rule
wenzelm@10915
  1102
to "split_conv" (old name still available for compatibility);
wenzelm@10915
  1103
wenzelm@10915
  1104
* HOL: improved concrete syntax for strings (e.g. allows translation
wenzelm@10915
  1105
rules with string literals);
wenzelm@10915
  1106
paulson@12245
  1107
* HOL-Real-Hyperreal: this extends HOL-Real with the hyperreals
paulson@12245
  1108
 and Fleuriot's mechanization of analysis, including the transcendental
paulson@12245
  1109
 functions for the reals;
paulson@10756
  1110
wenzelm@11094
  1111
* HOL/Real, HOL/Hyperreal: improved arithmetic simplification;
wenzelm@10391
  1112
wenzelm@10858
  1113
paulson@10474
  1114
*** CTT ***
paulson@10474
  1115
wenzelm@10547
  1116
* CTT: x-symbol support for Pi, Sigma, -->, : (membership); note that
wenzelm@10547
  1117
"lam" is displayed as TWO lambda-symbols
paulson@10474
  1118
wenzelm@10547
  1119
* CTT: theory Main now available, containing everything (that is, Bool
wenzelm@10547
  1120
and Arith);
wenzelm@10547
  1121
paulson@10474
  1122
wenzelm@10391
  1123
*** General ***
wenzelm@10391
  1124
wenzelm@10547
  1125
* Pure: the Simplifier has been implemented properly as a derived rule
wenzelm@10547
  1126
outside of the actual kernel (at last!); the overall performance
wenzelm@10547
  1127
penalty in practical applications is about 50%, while reliability of
wenzelm@10547
  1128
the Isabelle inference kernel has been greatly improved;
wenzelm@10547
  1129
wenzelm@11112
  1130
* print modes "brackets" and "no_brackets" control output of nested =>
wenzelm@11112
  1131
(types) and ==> (props); the default behaviour is "brackets";
wenzelm@11112
  1132
wenzelm@10391
  1133
* Provers: fast_tac (and friends) now handle actual object-logic rules
wenzelm@10391
  1134
as assumptions as well;
wenzelm@10391
  1135
wenzelm@11124
  1136
* system: support Poly/ML 4.0;
wenzelm@11124
  1137
wenzelm@11124
  1138
* system: isatool install handles KDE version 1 or 2;
wenzelm@11124
  1139
wenzelm@10391
  1140
wenzelm@10245
  1141
wenzelm@10103
  1142
New in Isabelle99-1 (October 2000)
wenzelm@10103
  1143
----------------------------------
wenzelm@8015
  1144
wenzelm@10003
  1145
*** Overview of INCOMPATIBILITIES ***
paulson@8014
  1146
wenzelm@8848
  1147
* HOL: simplification of natural numbers is much changed; to partly
wenzelm@8848
  1148
recover the old behaviour (e.g. to prevent n+n rewriting to #2*n)
wenzelm@8848
  1149
issue the following ML commands:
wenzelm@8848
  1150
wenzelm@8848
  1151
  Delsimprocs Nat_Numeral_Simprocs.cancel_numerals;
wenzelm@8848
  1152
  Delsimprocs [Nat_Numeral_Simprocs.combine_numerals];
paulson@8788
  1153
wenzelm@10129
  1154
* HOL: simplification no longer dives into case-expressions; this is
wenzelm@10129
  1155
controlled by "t.weak_case_cong" for each datatype t;
wenzelm@10003
  1156
wenzelm@10003
  1157
* HOL: nat_less_induct renamed to less_induct;
wenzelm@10003
  1158
wenzelm@10003
  1159
* HOL: systematic renaming of the SOME (Eps) rules, may use isatool
wenzelm@10003
  1160
fixsome to patch .thy and .ML sources automatically;
paulson@8967
  1161
wenzelm@10003
  1162
  select_equality  -> some_equality
wenzelm@10003
  1163
  select_eq_Ex     -> some_eq_ex
wenzelm@10003
  1164
  selectI2EX       -> someI2_ex
wenzelm@10003
  1165
  selectI2         -> someI2
wenzelm@10003
  1166
  selectI          -> someI
wenzelm@10003
  1167
  select1_equality -> some1_equality
wenzelm@10003
  1168
  Eps_sym_eq       -> some_sym_eq_trivial
wenzelm@10003
  1169
  Eps_eq           -> some_eq_trivial
wenzelm@10003
  1170
wenzelm@10003
  1171
* HOL: exhaust_tac on datatypes superceded by new generic case_tac;
wenzelm@10003
  1172
wenzelm@10003
  1173
* HOL: removed obsolete theorem binding expand_if (refer to split_if
wenzelm@10003
  1174
instead);
wenzelm@10003
  1175
wenzelm@10003
  1176
* HOL: the recursion equations generated by 'recdef' are now called
wenzelm@10003
  1177
f.simps instead of f.rules;
wenzelm@10003
  1178
wenzelm@10003
  1179
* HOL: qed_spec_mp now also handles bounded ALL as well;
wenzelm@10003
  1180
wenzelm@10003
  1181
* HOL: 0 is now overloaded, so the type constraint ":: nat" may
wenzelm@10003
  1182
sometimes be needed;
wenzelm@10003
  1183
wenzelm@10003
  1184
* HOL: the constant for "f``x" is now "image" rather than "op ``";
paulson@8014
  1185
paulson@10065
  1186
* HOL: the constant for "f-``x" is now "vimage" rather than "op -``";
paulson@10065
  1187
wenzelm@9330
  1188
* HOL: the disjoint sum is now "<+>" instead of "Plus"; the cartesian
wenzelm@9330
  1189
product is now "<*>" instead of "Times"; the lexicographic product is
wenzelm@9330
  1190
now "<*lex*>" instead of "**";
nipkow@8705
  1191
wenzelm@10003
  1192
* HOL: theory Sexp is now in HOL/Induct examples (it used to be part
wenzelm@10003
  1193
of main HOL, but was unused); better use HOL's datatype package;
paulson@9971
  1194
wenzelm@10137
  1195
* HOL: removed "symbols" syntax for constant "override" of theory Map;
wenzelm@10137
  1196
the old syntax may be recovered as follows:
wenzelm@10137
  1197
wenzelm@10137
  1198
  syntax (symbols)
wenzelm@10137
  1199
    override  :: "('a ~=> 'b) => ('a ~=> 'b) => ('a ~=> 'b)"
wenzelm@10137
  1200
      (infixl "\\<oplus>" 100)
wenzelm@10137
  1201
wenzelm@8848
  1202
* HOL/Real: "rabs" replaced by overloaded "abs" function;
wenzelm@8848
  1203
wenzelm@8887
  1204
* HOL/ML: even fewer consts are declared as global (see theories Ord,
wenzelm@8887
  1205
Lfp, Gfp, WF); this only affects ML packages that refer to const names
wenzelm@8887
  1206
internally;
wenzelm@8887
  1207
wenzelm@10003
  1208
* HOL and ZF: syntax for quotienting wrt an equivalence relation
wenzelm@10003
  1209
changed from A/r to A//r;
wenzelm@9908
  1210
wenzelm@10003
  1211
* ZF: new treatment of arithmetic (nat & int) may break some old
wenzelm@10003
  1212
proofs;
wenzelm@8921
  1213
wenzelm@10003
  1214
* Isar: renamed some attributes (RS -> THEN, simplify -> simplified,
wenzelm@10003
  1215
rulify -> rule_format, elimify -> elim_format, ...);
paulson@9542
  1216
wenzelm@9941
  1217
* Isar/Provers: intro/elim/dest attributes changed; renamed
wenzelm@9941
  1218
intro/intro!/intro!! flags to intro!/intro/intro? (in most cases, one
wenzelm@9937
  1219
should have to change intro!! to intro? only); replaced "delrule" by
wenzelm@9937
  1220
"rule del";
wenzelm@9437
  1221
wenzelm@9612
  1222
* Isar/HOL: renamed "intrs" to "intros" in inductive definitions;
wenzelm@9612
  1223
wenzelm@9437
  1224
* Provers: strengthened force_tac by using new first_best_tac;
oheimb@9402
  1225
wenzelm@10003
  1226
* LaTeX document preparation: several changes of isabelle.sty (see
wenzelm@10003
  1227
lib/texinputs);
wenzelm@8729
  1228
paulson@8014
  1229
wenzelm@8487
  1230
*** Document preparation ***
wenzelm@8358
  1231
wenzelm@9198
  1232
* formal comments (text blocks etc.) in new-style theories may now
wenzelm@9753
  1233
contain antiquotations of thm/prop/term/typ/text to be presented
wenzelm@9753
  1234
according to latex print mode; concrete syntax is like this:
wenzelm@9753
  1235
@{term[show_types] "f(x) = a + x"};
wenzelm@9198
  1236
wenzelm@8358
  1237
* isatool mkdir provides easy setup of Isabelle session directories,
wenzelm@8518
  1238
including proper document sources;
wenzelm@8358
  1239
wenzelm@8358
  1240
* generated LaTeX sources are now deleted after successful run
wenzelm@8358
  1241
(isatool document -c); may retain a copy somewhere else via -D option
wenzelm@8358
  1242
of isatool usedir;
wenzelm@8358
  1243
wenzelm@8566
  1244
* isatool usedir -D now lets isatool latex -o sty update the Isabelle
wenzelm@10003
  1245
style files, achieving self-contained LaTeX sources and simplifying
wenzelm@10003
  1246
LaTeX debugging;
wenzelm@8566
  1247
wenzelm@8518
  1248
* old-style theories now produce (crude) LaTeX output as well;
wenzelm@8358
  1249
wenzelm@9057
  1250
* browser info session directories are now self-contained (may be put
wenzelm@9437
  1251
on WWW server seperately); improved graphs of nested sessions; removed
wenzelm@9437
  1252
graph for 'all sessions';
wenzelm@9057
  1253
wenzelm@10003
  1254
* several improvements in isabelle style files; \isabellestyle{it}
wenzelm@10003
  1255
produces fake math mode output; \isamarkupheader is now \section by
wenzelm@10003
  1256
default; see lib/texinputs/isabelle.sty etc.;
wenzelm@9489
  1257
wenzelm@8358
  1258
wenzelm@8184
  1259
*** Isar ***
wenzelm@8184
  1260
wenzelm@10003
  1261
* Isar/Pure: local results and corresponding term bindings are now
wenzelm@10003
  1262
subject to Hindley-Milner polymorphism (similar to ML); this
wenzelm@10003
  1263
accommodates incremental type-inference very nicely;
wenzelm@8283
  1264
wenzelm@10003
  1265
* Isar/Pure: new derived language element 'obtain' supports
wenzelm@10003
  1266
generalized existence reasoning;
wenzelm@8621
  1267
wenzelm@10003
  1268
* Isar/Pure: new calculational elements 'moreover' and 'ultimately'
wenzelm@10003
  1269
support accumulation of results, without applying any rules yet;
wenzelm@10003
  1270
useful to collect intermediate results without explicit name
wenzelm@10003
  1271
references, and for use with transitivity rules with more than 2
wenzelm@10003
  1272
premises;
wenzelm@8184
  1273
wenzelm@10003
  1274
* Isar/Pure: scalable support for case-analysis type proofs: new
wenzelm@10003
  1275
'case' language element refers to local contexts symbolically, as
wenzelm@10003
  1276
produced by certain proof methods; internally, case names are attached
wenzelm@10003
  1277
to theorems as "tags";
wenzelm@8440
  1278
wenzelm@10003
  1279
* Isar/Pure: theory command 'hide' removes declarations from
wenzelm@9330
  1280
class/type/const name spaces;
wenzelm@9330
  1281
wenzelm@10003
  1282
* Isar/Pure: theory command 'defs' supports option "(overloaded)" to
wenzelm@9330
  1283
indicate potential overloading;
wenzelm@9330
  1284
wenzelm@10003
  1285
* Isar/Pure: changed syntax of local blocks from {{ }} to { };
wenzelm@8621
  1286
wenzelm@10003
  1287
* Isar/Pure: syntax of sorts made 'inner', i.e. have to write
wenzelm@10003
  1288
"{a,b,c}" instead of {a,b,c};
wenzelm@9011
  1289
wenzelm@10003
  1290
* Isar/Pure now provides its own version of intro/elim/dest
wenzelm@10003
  1291
attributes; useful for building new logics, but beware of confusion
wenzelm@10003
  1292
with the version in Provers/classical;
wenzelm@9612
  1293
wenzelm@10003
  1294
* Isar/Pure: the local context of (non-atomic) goals is provided via
wenzelm@10003
  1295
case name 'antecedent';
wenzelm@8440
  1296
wenzelm@10003
  1297
* Isar/Pure: removed obsolete 'transfer' attribute (transfer of thms
wenzelm@10003
  1298
to the current context is now done automatically);
wenzelm@9383
  1299
wenzelm@10003
  1300
* Isar/Pure: theory command 'method_setup' provides a simple interface
wenzelm@10003
  1301
for definining proof methods in ML;
wenzelm@9612
  1302
wenzelm@10003
  1303
* Isar/Provers: intro/elim/dest attributes changed; renamed
wenzelm@9941
  1304
intro/intro!/intro!! flags to intro!/intro/intro? (INCOMPATIBILITY, in
wenzelm@9941
  1305
most cases, one should have to change intro!! to intro? only);
wenzelm@9941
  1306
replaced "delrule" by "rule del";
wenzelm@8283
  1307
wenzelm@10003
  1308
* Isar/Provers: new 'hypsubst' method, plain 'subst' method and
wenzelm@10003
  1309
'symmetric' attribute (the latter supercedes [RS sym]);
wenzelm@10003
  1310
wenzelm@10003
  1311
* Isar/Provers: splitter support (via 'split' attribute and 'simp'
wenzelm@10003
  1312
method modifier); 'simp' method: 'only:' modifier removes loopers as
wenzelm@10003
  1313
well (including splits);
wenzelm@10003
  1314
wenzelm@10003
  1315
* Isar/Provers: Simplifier and Classical methods now support all kind
wenzelm@10003
  1316
of modifiers used in the past, including 'cong', 'iff', etc.
wenzelm@10003
  1317
wenzelm@10003
  1318
* Isar/Provers: added 'fastsimp' and 'clarsimp' methods (combination
wenzelm@10003
  1319
of Simplifier and Classical reasoner);
wenzelm@10003
  1320
wenzelm@10003
  1321
* Isar/HOL: new proof method 'cases' and improved version of 'induct'
wenzelm@10003
  1322
now support named cases; major packages (inductive, datatype, primrec,
wenzelm@10003
  1323
recdef) support case names and properly name parameters;
wenzelm@9612
  1324
wenzelm@10003
  1325
* Isar/HOL: new transitivity rules for substitution in inequalities --
wenzelm@10003
  1326
monotonicity conditions are extracted to be proven at end of
wenzelm@10003
  1327
calculations;
wenzelm@10003
  1328
wenzelm@10003
  1329
* Isar/HOL: removed 'case_split' thm binding, should use 'cases' proof
wenzelm@10003
  1330
method anyway;
wenzelm@10003
  1331
wenzelm@10003
  1332
* Isar/HOL: removed old expand_if = split_if; theorems if_splits =
wenzelm@10003
  1333
split_if split_if_asm; datatype package provides theorems foo.splits =
wenzelm@10003
  1334
foo.split foo.split_asm for each datatype;
wenzelm@10003
  1335
wenzelm@10003
  1336
* Isar/HOL: tuned inductive package, rename "intrs" to "intros"
wenzelm@10003
  1337
(potential INCOMPATIBILITY), emulation of mk_cases feature for proof
wenzelm@10003
  1338
scripts: new 'inductive_cases' command and 'ind_cases' method; (Note:
wenzelm@10003
  1339
use "(cases (simplified))" method in proper proof texts);
wenzelm@10003
  1340
wenzelm@10003
  1341
* Isar/HOL: added global 'arith_split' attribute for 'arith' method;
wenzelm@10003
  1342
wenzelm@10003
  1343
* Isar: names of theorems etc. may be natural numbers as well;
wenzelm@10003
  1344
wenzelm@10003
  1345
* Isar: 'pr' command: optional arguments for goals_limit and
wenzelm@9724
  1346
ProofContext.prems_limit; no longer prints theory contexts, but only
wenzelm@9724
  1347
proof states;
wenzelm@8487
  1348
wenzelm@10003
  1349
* Isar: diagnostic commands 'pr', 'thm', 'prop', 'term', 'typ' admit
wenzelm@8518
  1350
additional print modes to be specified; e.g. "pr(latex)" will print
wenzelm@8518
  1351
proof state according to the Isabelle LaTeX style;
wenzelm@8487
  1352
wenzelm@10003
  1353
* Isar: improved support for emulating tactic scripts, including proof
wenzelm@9612
  1354
methods 'rule_tac' etc., 'cut_tac', 'thin_tac', 'subgoal_tac',
wenzelm@9612
  1355
'rename_tac', 'rotate_tac', 'tactic', and 'case_tac' / 'induct_tac'
wenzelm@9612
  1356
(for HOL datatypes);
wenzelm@8534
  1357
wenzelm@10003
  1358
* Isar: simplified (more robust) goal selection of proof methods: 1st
wenzelm@10003
  1359
goal, all goals, or explicit goal specifier (tactic emulation); thus
wenzelm@10003
  1360
'proof method scripts' have to be in depth-first order;
wenzelm@8673
  1361
wenzelm@10003
  1362
* Isar: tuned 'let' syntax: replaced 'as' keyword by 'and';
wenzelm@8729
  1363
wenzelm@10003
  1364
* Isar: removed 'help' command, which hasn't been too helpful anyway;
wenzelm@10003
  1365
should instead use individual commands for printing items
wenzelm@10003
  1366
(print_commands, print_methods etc.);
wenzelm@9224
  1367
wenzelm@10003
  1368
* Isar: added 'nothing' --- the empty list of theorems;
wenzelm@9239
  1369
wenzelm@8184
  1370
paulson@8014
  1371
*** HOL ***
paulson@8014
  1372
wenzelm@10080
  1373
* HOL/MicroJava: formalization of a fragment of Java, together with a
wenzelm@10080
  1374
corresponding virtual machine and a specification of its bytecode
wenzelm@10080
  1375
verifier and a lightweight bytecode verifier, including proofs of
wenzelm@10080
  1376
type-safety; by Gerwin Klein, Tobias Nipkow, David von Oheimb, and
wenzelm@10080
  1377
Cornelia Pusch (see also the homepage of project Bali at
wenzelm@10080
  1378
http://isabelle.in.tum.de/Bali/);
wenzelm@10080
  1379
wenzelm@8518
  1380
* HOL/Algebra: new theory of rings and univariate polynomials, by
wenzelm@8518
  1381
Clemens Ballarin;
paulson@8014
  1382
wenzelm@10157
  1383
* HOL/NumberTheory: fundamental Theorem of Arithmetic, Chinese
wenzelm@10003
  1384
Remainder Theorem, Fermat/Euler Theorem, Wilson's Theorem, by Thomas M
wenzelm@10003
  1385
Rasmussen;
wenzelm@8570
  1386
wenzelm@10157
  1387
* HOL/Lattice: fundamental concepts of lattice theory and order
wenzelm@10157
  1388
structures, including duals, properties of bounds versus algebraic
wenzelm@10157
  1389
laws, lattice operations versus set-theoretic ones, the Knaster-Tarski
wenzelm@10157
  1390
Theorem for complete lattices etc.; may also serve as a demonstration
wenzelm@10157
  1391
for abstract algebraic reasoning using axiomatic type classes, and
wenzelm@10157
  1392
mathematics-style proof in Isabelle/Isar; by Markus Wenzel;
wenzelm@10157
  1393
wenzelm@10003
  1394
* HOL/Prolog: a (bare-bones) implementation of Lambda-Prolog, by David
wenzelm@10003
  1395
von Oheimb;
paulson@9542
  1396
wenzelm@10164
  1397
* HOL/IMPP: extension of IMP with local variables and mutually
wenzelm@10164
  1398
recursive procedures, by David von Oheimb;
wenzelm@10164
  1399
wenzelm@10003
  1400
* HOL/Lambda: converted into new-style theory and document;
paulson@9542
  1401
wenzelm@10003
  1402
* HOL/ex/Multiquote: example of multiple nested quotations and
wenzelm@10003
  1403
anti-quotations -- basically a generalized version of de-Bruijn
wenzelm@10003
  1404
representation; very useful in avoiding lifting of operations;
wenzelm@8848
  1405
wenzelm@9612
  1406
* HOL/record: added general record equality rule to simpset; fixed
wenzelm@9612
  1407
select-update simplification procedure to handle extended records as
wenzelm@9612
  1408
well; admit "r" as field name;
paulson@9542
  1409
paulson@8967
  1410
* HOL: 0 is now overloaded over the new sort "zero", allowing its use with
paulson@8967
  1411
other numeric types and also as the identity of groups, rings, etc.;
paulson@8967
  1412
paulson@8967
  1413
* HOL: new axclass plus_ac0 for addition with the AC-laws and 0 as identity.
paulson@8967
  1414
Types nat and int belong to this axclass;
paulson@8967
  1415
wenzelm@10003
  1416
* HOL: greatly improved simplification involving numerals of type nat, int, real:
paulson@8788
  1417
   (i + #8 + j) = Suc k simplifies to  #7 + (i + j) = k
paulson@8832
  1418
   i*j + k + j*#3*i     simplifies to  #4*(i*j) + k
paulson@8832
  1419
  two terms #m*u and #n*u are replaced by #(m+n)*u
paulson@8832
  1420
    (where #m, #n and u can implicitly be 1; this is simproc combine_numerals)
paulson@8832
  1421
  and the term/formula #m*u+x ~~ #n*u+y simplifies simplifies to #(m-n)+x ~~ y
paulson@8832
  1422
    or x ~~ #(n-m)+y, where ~~ is one of = < <= or - (simproc cancel_numerals);
paulson@8736
  1423
wenzelm@10003
  1424
* HOL: meson_tac is available (previously in ex/meson.ML); it is a
wenzelm@10003
  1425
powerful prover for predicate logic but knows nothing of clasets; see
wenzelm@10003
  1426
ex/mesontest.ML and ex/mesontest2.ML for example applications;
paulson@9835
  1427
wenzelm@8848
  1428
* HOL: new version of "case_tac" subsumes both boolean case split and
wenzelm@8440
  1429
"exhaust_tac" on datatypes; INCOMPATIBILITY: exhaust_tac no longer
wenzelm@8518
  1430
exists, may define val exhaust_tac = case_tac for ad-hoc portability;
wenzelm@8440
  1431
wenzelm@8848
  1432
* HOL: simplification no longer dives into case-expressions: only the
wenzelm@10129
  1433
selector expression is simplified, but not the remaining arms; to
wenzelm@10129
  1434
enable full simplification of case-expressions for datatype t, you may
wenzelm@10129
  1435
remove t.weak_case_cong from the simpset, either globally (Delcongs
wenzelm@10129
  1436
[thm"t.weak_case_cong"];) or locally (delcongs [...]).
nipkow@8603
  1437
wenzelm@8848
  1438
* HOL/recdef: the recursion equations generated by 'recdef' for
wenzelm@8848
  1439
function 'f' are now called f.simps instead of f.rules; if all
wenzelm@8848
  1440
termination conditions are proved automatically, these simplification
wenzelm@8848
  1441
rules are added to the simpset, as in primrec; rules may be named
wenzelm@8848
  1442
individually as well, resulting in a separate list of theorems for
wenzelm@8848
  1443
each equation;
wenzelm@8848
  1444
wenzelm@9489
  1445
* HOL/While is a new theory that provides a while-combinator. It
wenzelm@9489
  1446
permits the definition of tail-recursive functions without the
wenzelm@9489
  1447
provision of a termination measure. The latter is necessary once the
wenzelm@9489
  1448
invariant proof rule for while is applied.
nipkow@9457
  1449
wenzelm@10003
  1450
* HOL: new (overloaded) notation for the set of elements below/above
wenzelm@10003
  1451
some element: {..u}, {..u(}, {l..}, {)l..}. See theory SetInterval.
nipkow@8925
  1452
wenzelm@8848
  1453
* HOL: theorems impI, allI, ballI bound as "strip";
wenzelm@8848
  1454
wenzelm@10003
  1455
* HOL: new tactic induct_thm_tac: thm -> string -> int -> tactic
nipkow@9746
  1456
induct_tac th "x1 ... xn" expects th to have a conclusion of the form
nipkow@9746
  1457
P v1 ... vn and abbreviates res_inst_tac [("v1","x1"),...,("vn","xn")] th;
nipkow@9746
  1458
wenzelm@10003
  1459
* HOL/Real: "rabs" replaced by overloaded "abs" function;
nipkow@9737
  1460
wenzelm@10003
  1461
* HOL: theory Sexp now in HOL/Induct examples (it used to be part of
wenzelm@10003
  1462
main HOL, but was unused);
nipkow@8626
  1463
wenzelm@10003
  1464
* HOL: fewer consts declared as global (e.g. have to refer to
wenzelm@10003
  1465
"Lfp.lfp" instead of "lfp" internally; affects ML packages only);
wenzelm@8887
  1466
wenzelm@10003
  1467
* HOL: tuned AST representation of nested pairs, avoiding bogus output
wenzelm@10003
  1468
in case of overlap with user translations (e.g. judgements over
wenzelm@10003
  1469
tuples); (note that the underlying logical represenation is still
wenzelm@10003
  1470
bogus);
wenzelm@9349
  1471
nipkow@8412
  1472
paulson@9542
  1473
*** ZF ***
paulson@9542
  1474
wenzelm@10003
  1475
* ZF: simplification automatically cancels common terms in arithmetic
wenzelm@10003
  1476
expressions over nat and int;
paulson@9542
  1477
wenzelm@10003
  1478
* ZF: new treatment of nat to minimize type-checking: all operators
wenzelm@10003
  1479
coerce their operands to a natural number using the function natify,
wenzelm@10003
  1480
making the algebraic laws unconditional;
paulson@9542
  1481
wenzelm@10003
  1482
* ZF: as above, for int: operators coerce their operands to an integer
wenzelm@10003
  1483
using the function intify;
paulson@9542
  1484
wenzelm@10003
  1485
* ZF: the integer library now contains many of the usual laws for the
wenzelm@10003
  1486
orderings, including $<=, and monotonicity laws for $+ and $*;
paulson@9542
  1487
wenzelm@10003
  1488
* ZF: new example ZF/ex/NatSum to demonstrate integer arithmetic
wenzelm@10003
  1489
simplification;
paulson@9388
  1490
wenzelm@10003
  1491
* FOL and ZF: AddIffs now available, giving theorems of the form P<->Q
wenzelm@10003
  1492
to the simplifier and classical reasoner simultaneously;
paulson@9388
  1493
paulson@9388
  1494
wenzelm@8358
  1495
*** General ***
wenzelm@8358
  1496
wenzelm@10003
  1497
* Provers: blast_tac now handles actual object-logic rules as
wenzelm@10003
  1498
assumptions; note that auto_tac uses blast_tac internally as well;
wenzelm@10003
  1499
wenzelm@10003
  1500
* Provers: new functions rulify/rulify_no_asm: thm -> thm for turning
wenzelm@10003
  1501
outer -->/All/Ball into ==>/!!; qed_spec_mp now uses rulify_no_asm;
wenzelm@10003
  1502
wenzelm@9941
  1503
* Provers: delrules now handles destruct rules as well (no longer need
wenzelm@9941
  1504
explicit make_elim);
wenzelm@9941
  1505
wenzelm@10003
  1506
* Provers: Blast_tac now warns of and ignores "weak elimination rules" e.g.
wenzelm@10003
  1507
  [| inj ?f;          ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
wenzelm@10003
  1508
use instead the strong form,
wenzelm@10003
  1509
  [| inj ?f; ~ ?W ==> ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
wenzelm@10003
  1510
in HOL, FOL and ZF the function cla_make_elim will create such rules
wenzelm@10003
  1511
from destruct-rules;
wenzelm@9489
  1512
wenzelm@9709
  1513
* Provers: Simplifier.easy_setup provides a fast path to basic
wenzelm@9709
  1514
Simplifier setup for new object-logics;
wenzelm@9709
  1515
wenzelm@9709
  1516
* Pure: AST translation rules no longer require constant head on LHS;
wenzelm@9349
  1517
wenzelm@9709
  1518
* Pure: improved name spaces: ambiguous output is qualified; support
wenzelm@9709
  1519
for hiding of names;
wenzelm@8729
  1520
wenzelm@10003
  1521
* system: smart setup of canonical ML_HOME, ISABELLE_INTERFACE, and
wenzelm@10003
  1522
XSYMBOL_HOME; no longer need to do manual configuration in most
wenzelm@10003
  1523
situations;
wenzelm@10003
  1524
wenzelm@9709
  1525
* system: compression of ML heaps images may now be controlled via -c
wenzelm@9709
  1526
option of isabelle and isatool usedir (currently only observed by
wenzelm@9709
  1527
Poly/ML);
wenzelm@8358
  1528
wenzelm@9981
  1529
* system: isatool installfonts may handle X-Symbol fonts as well (very
wenzelm@9981
  1530
useful for remote X11);
wenzelm@9981
  1531
wenzelm@9709
  1532
* system: provide TAGS file for Isabelle sources;
wenzelm@9052
  1533
wenzelm@9288
  1534
* ML: infix 'OF' is a version of 'MRS' with more appropriate argument
wenzelm@9288
  1535
order;
wenzelm@9288
  1536
wenzelm@8994
  1537
* ML: renamed flags Syntax.trace_norm_ast to Syntax.trace_ast; global
wenzelm@8994
  1538
timing flag supersedes proof_timing and Toplevel.trace;
wenzelm@8994
  1539
wenzelm@10003
  1540
* ML: new combinators |>> and |>>> for incremental transformations
wenzelm@10003
  1541
with secondary results (e.g. certain theory extensions):
wenzelm@10003
  1542
wenzelm@9330
  1543
* ML: PureThy.add_defs gets additional argument to indicate potential
wenzelm@9330
  1544
overloading (usually false);
wenzelm@9330
  1545
wenzelm@10003
  1546
* ML: PureThy.add_thms/add_axioms/add_defs now return theorems as
wenzelm@10003
  1547
results;
wenzelm@8440
  1548
wenzelm@8358
  1549
wenzelm@8015
  1550
wenzelm@7986
  1551
New in Isabelle99 (October 1999)
wenzelm@7986
  1552
--------------------------------
oheimb@4649
  1553
paulson@5931
  1554
*** Overview of INCOMPATIBILITIES (see below for more details) ***
paulson@5931
  1555
paulson@6922
  1556
* HOL: The THEN and ELSE parts of conditional expressions (if P then x else y)
paulson@6922
  1557
are no longer simplified.  (This allows the simplifier to unfold recursive
paulson@6922
  1558
functional programs.)  To restore the old behaviour, declare
wenzelm@7215
  1559
wenzelm@7215
  1560
    Delcongs [if_weak_cong];
paulson@6922
  1561
wenzelm@6269
  1562
* HOL: Removed the obsolete syntax "Compl A"; use -A for set
wenzelm@6269
  1563
complement;
paulson@5931
  1564
wenzelm@6269
  1565
* HOL: the predicate "inj" is now defined by translation to "inj_on";
paulson@6174
  1566
berghofe@7847
  1567
* HOL/datatype: mutual_induct_tac no longer exists --
berghofe@7847
  1568
  use induct_tac "x_1 ... x_n" instead of mutual_induct_tac ["x_1", ..., "x_n"]
berghofe@7847
  1569
wenzelm@6386
  1570
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
  1571
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
  1572
wenzelm@6269
  1573
* ZF: The con_defs part of an inductive definition may no longer refer
wenzelm@6269
  1574
to constants declared in the same theory;
nipkow@6057
  1575
wenzelm@6269
  1576
* HOL, ZF: the function mk_cases, generated by the inductive
wenzelm@6269
  1577
definition package, has lost an argument.  To simplify its result, it
wenzelm@6269
  1578
uses the default simpset instead of a supplied list of theorems.
paulson@6141
  1579
wenzelm@7215
  1580
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
  1581
nipkow@7619
  1582
* Simplifier: the type of the infix ML functions
wenzelm@8729
  1583
        setSSolver addSSolver setSolver addSolver
nipkow@7619
  1584
is now  simpset * solver -> simpset  where `solver' is a new abstract type
nipkow@7619
  1585
for packaging solvers. A solver is created via
wenzelm@8729
  1586
        mk_solver: string -> (thm list -> int -> tactic) -> solver
nipkow@7619
  1587
where the string argument is only a comment.
nipkow@6057
  1588
wenzelm@7647
  1589
paulson@6069
  1590
*** Proof tools ***
paulson@6069
  1591
wenzelm@6343
  1592
* Provers/Arith/fast_lin_arith.ML contains a functor for creating a
wenzelm@6343
  1593
decision procedure for linear arithmetic. Currently it is used for
wenzelm@7593
  1594
types `nat', `int', and `real' in HOL (see below); it can, should and
wenzelm@7593
  1595
will be instantiated for other types and logics as well.
paulson@6069
  1596
nipkow@7324
  1597
* The simplifier now accepts rewrite rules with flexible heads, eg
nipkow@7324
  1598
     hom ?f ==> ?f(?x+?y) = ?f ?x + ?f ?y
nipkow@7324
  1599
  They are applied like any rule with a non-pattern lhs, i.e. by first-order
nipkow@7324
  1600
  matching.
paulson@6069
  1601
wenzelm@7593
  1602
paulson@6014
  1603
*** General ***
paulson@6014
  1604
wenzelm@7986
  1605
* New Isabelle/Isar subsystem provides an alternative to traditional
wenzelm@7215
  1606
tactical theorem proving; together with the ProofGeneral/isar user
wenzelm@7215
  1607
interface it offers an interactive environment for developing human
wenzelm@7215
  1608
readable proof documents (Isar == Intelligible semi-automated
wenzelm@7886
  1609
reasoning); for further information see isatool doc isar-ref,
wenzelm@7986
  1610
src/HOL/Isar_examples and http://isabelle.in.tum.de/Isar/
wenzelm@7886
  1611
wenzelm@9612
  1612
* improved and simplified presentation of theories: better HTML markup
wenzelm@9612
  1613
(including colors), graph views in several sizes; isatool usedir now
wenzelm@9612
  1614
provides a proper interface for user theories (via -P option); actual
wenzelm@9612
  1615
document preparation based on (PDF)LaTeX is available as well (for
wenzelm@9612
  1616
new-style theories only); see isatool doc system for more information;
wenzelm@7215
  1617
wenzelm@7252
  1618
* native support for Proof General, both for classic Isabelle and
wenzelm@7986
  1619
Isabelle/Isar;
wenzelm@7215
  1620
wenzelm@7791
  1621
* ML function thm_deps visualizes dependencies of theorems and lemmas,
wenzelm@7791
  1622
using the graph browser tool;
wenzelm@7791
  1623
wenzelm@6751
  1624
* Isabelle manuals now also available as PDF;
wenzelm@6751
  1625
wenzelm@6449
  1626
* theory loader rewritten from scratch (may not be fully
wenzelm@6449
  1627
bug-compatible); old loadpath variable has been replaced by show_path,
wenzelm@6671
  1628
add_path, del_path, reset_path functions; new operations such as
wenzelm@7593
  1629
update_thy, touch_thy, remove_thy, use/update_thy_only (see also
wenzelm@7593
  1630
isatool doc ref);
wenzelm@6449
  1631
wenzelm@7215
  1632
* improved isatool install: option -k creates KDE application icon,
wenzelm@7215
  1633
option -p DIR installs standalone binaries;
wenzelm@7215
  1634
wenzelm@7215
  1635
* added ML_PLATFORM setting (useful for cross-platform installations);
wenzelm@7215
  1636
more robust handling of platform specific ML images for SML/NJ;
wenzelm@7215
  1637
wenzelm@7886
  1638
* the settings environment is now statically scoped, i.e. it is never
wenzelm@7986
  1639
created again in sub-processes invoked from isabelle, isatool, or
wenzelm@7886
  1640
Isabelle;
wenzelm@7886
  1641
wenzelm@7215
  1642
* path element specification '~~' refers to '$ISABELLE_HOME';
wenzelm@7215
  1643
wenzelm@6343
  1644
* in locales, the "assumes" and "defines" parts may be omitted if
wenzelm@6343
  1645
empty;
wenzelm@5973
  1646
wenzelm@6269
  1647
* new print_mode "xsymbols" for extended symbol support (e.g. genuine
wenzelm@6269
  1648
long arrows);
wenzelm@6259
  1649
wenzelm@6343
  1650
* new print_mode "HTML";
wenzelm@6343
  1651
wenzelm@6343
  1652
* new flag show_tags controls display of tags of theorems (which are
wenzelm@6343
  1653
basically just comments that may be attached by some tools);
wenzelm@6343
  1654
wenzelm@6461
  1655
* Isamode 2.6 requires patch to accomodate change of Isabelle font
wenzelm@6461
  1656
mode and goal output format:
wenzelm@6461
  1657
wenzelm@6461
  1658
diff -r Isamode-2.6/elisp/isa-load.el Isamode/elisp/isa-load.el
wenzelm@6461
  1659
244c244
wenzelm@6461
  1660
<       (list (isa-getenv "ISABELLE") "-msymbols" logic-name)
wenzelm@6461
  1661
---
wenzelm@6533
  1662
>       (list (isa-getenv "ISABELLE") "-misabelle_font" "-msymbols" logic-name)
wenzelm@6461
  1663
diff -r Isabelle-2.6/elisp/isa-proofstate.el Isamode/elisp/isa-proofstate.el
wenzelm@6461
  1664
181c181
wenzelm@6461
  1665
< (defconst proofstate-proofstart-regexp "^Level [0-9]+$"
wenzelm@6461
  1666
---
wenzelm@6461
  1667
> (defconst proofstate-proofstart-regexp "^Level [0-9]+"
wenzelm@6461
  1668
wenzelm@7450
  1669
* function bind_thms stores lists of theorems (cf. bind_thm);
wenzelm@7450
  1670
wenzelm@7593
  1671
* new shorthand tactics ftac, eatac, datac, fatac;
wenzelm@7593
  1672
wenzelm@7593
  1673
* qed (and friends) now accept "" as result name; in that case the
wenzelm@7986
  1674
theorem is not stored, but proper checks and presentation of the
wenzelm@7986
  1675
result still apply;
wenzelm@7593
  1676
wenzelm@7805
  1677
* theorem database now also indexes constants "Trueprop", "all",
wenzelm@7805
  1678
"==>", "=="; thus thms_containing, findI etc. may retrieve more rules;
wenzelm@7805
  1679
oheimb@6028
  1680
nipkow@6057
  1681
*** HOL ***
nipkow@6057
  1682
wenzelm@7215
  1683
** HOL arithmetic **
wenzelm@7215
  1684
wenzelm@6343
  1685
* There are now decision procedures for linear arithmetic over nat and
wenzelm@6343
  1686
int:
nipkow@6131
  1687
wenzelm@6343
  1688
1. arith_tac copes with arbitrary formulae involving `=', `<', `<=',
wenzelm@6343
  1689
`+', `-', `Suc', `min', `max' and numerical constants; other subterms
wenzelm@6343
  1690
are treated as atomic; subformulae not involving type `nat' or `int'
wenzelm@6343
  1691
are ignored; quantified subformulae are ignored unless they are
wenzelm@6343
  1692
positive universal or negative existential. The tactic has to be
wenzelm@6343
  1693
invoked by hand and can be a little bit slow. In particular, the
wenzelm@6343
  1694
running time is exponential in the number of occurrences of `min' and
wenzelm@6343
  1695
`max', and `-' on `nat'.
nipkow@6131
  1696
wenzelm@6343
  1697
2. fast_arith_tac is a cut-down version of arith_tac: it only takes
wenzelm@6343
  1698
(negated) (in)equalities among the premises and the conclusion into
wenzelm@6343
  1699
account (i.e. no compound formulae) and does not know about `min' and
wenzelm@6343
  1700
`max', and `-' on `nat'. It is fast and is used automatically by the
wenzelm@6343
  1701
simplifier.
nipkow@6131
  1702
wenzelm@6343
  1703
NB: At the moment, these decision procedures do not cope with mixed
wenzelm@6343
  1704
nat/int formulae where the two parts interact, such as `m < n ==>
wenzelm@6343
  1705
int(m) < int(n)'.
oheimb@6028
  1706
wenzelm@7215
  1707
* HOL/Numeral provides a generic theory of numerals (encoded
wenzelm@7313
  1708
efficiently as bit strings); setup for types nat/int/real is in place;
wenzelm@7215
  1709
INCOMPATIBILITY: since numeral syntax is now polymorphic, rather than
wenzelm@7215
  1710
int, existing theories and proof scripts may require a few additional
wenzelm@7215
  1711
type constraints;
wenzelm@7215
  1712
wenzelm@7215
  1713
* integer division and remainder can now be performed on constant
wenzelm@7215
  1714
arguments;
paulson@7157
  1715
wenzelm@7215
  1716
* many properties of integer multiplication, division and remainder
wenzelm@7215
  1717
are now available;
paulson@6922
  1718
paulson@7287
  1719
* An interface to the Stanford Validity Checker (SVC) is available through the
paulson@7287
  1720
tactic svc_tac.  Propositional tautologies and theorems of linear arithmetic
paulson@7287
  1721
are proved automatically.  SVC must be installed separately, and its results
paulson@7287
  1722
must be TAKEN ON TRUST (Isabelle does not check the proofs, but tags any
paulson@7287
  1723
invocation of the underlying oracle).  For SVC see
paulson@7444
  1724
  http://verify.stanford.edu/SVC
paulson@6922
  1725
wenzelm@7125
  1726
* IsaMakefile: the HOL-Real target now builds an actual image;
wenzelm@7125
  1727
wenzelm@7215
  1728
wenzelm@7215
  1729
** HOL misc **
wenzelm@7215
  1730
wenzelm@7595
  1731
* HOL/Real/HahnBanach: the Hahn-Banach theorem for real vector spaces
wenzelm@7595
  1732
(in Isabelle/Isar) -- by Gertrud Bauer;
wenzelm@7595
  1733
wenzelm@7691
  1734
* HOL/BCV: generic model of bytecode verification, i.e. data-flow
wenzelm@7691
  1735
analysis for assembly languages with subtypes;
wenzelm@7691
  1736
wenzelm@6278
  1737
* HOL/TLA (Lamport's Temporal Logic of Actions): major reorganization
wenzelm@6278
  1738
-- avoids syntactic ambiguities and treats state, transition, and
wenzelm@6278
  1739
temporal levels more uniformly; introduces INCOMPATIBILITIES due to
wenzelm@6278
  1740
changed syntax and (many) tactics;
wenzelm@6278
  1741
wenzelm@7791
  1742
* HOL/inductive: Now also handles more general introduction rules such
wenzelm@7791
  1743
  as "ALL y. (y, x) : r --> y : acc r ==> x : acc r"; monotonicity
wenzelm@7791
  1744
  theorems are now maintained within the theory (maintained via the
wenzelm@7791
  1745
  "mono" attribute);
berghofe@7780
  1746
wenzelm@7238
  1747
* HOL/datatype: Now also handles arbitrarily branching datatypes
wenzelm@7238
  1748
  (using function types) such as
wenzelm@7238
  1749
wenzelm@7238
  1750
  datatype 'a tree = Atom 'a | Branch "nat => 'a tree"
berghofe@7047
  1751
wenzelm@7326
  1752
* HOL/record: record_simproc (part of the default simpset) takes care
wenzelm@7326
  1753
of selectors applied to updated records; record_split_tac is no longer
wenzelm@7327
  1754
part of the default claset; update_defs may now be removed from the
wenzelm@7327
  1755
simpset in many cases; COMPATIBILITY: old behavior achieved by
wenzelm@7326
  1756
wenzelm@7326
  1757
  claset_ref () := claset() addSWrapper record_split_wrapper;
wenzelm@7326
  1758
  Delsimprocs [record_simproc]
wenzelm@7326
  1759
wenzelm@6386
  1760
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
  1761
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
  1762
paulson@7287
  1763
* HOL/recdef (TFL): 'congs' syntax now expects comma separated list of theorem
paulson@7287
  1764
names rather than an ML expression;
paulson@7287
  1765
paulson@7287
  1766
* HOL/defer_recdef (TFL): like recdef but the well-founded relation can be
paulson@7287
  1767
supplied later.  Program schemes can be defined, such as
paulson@7287
  1768
    "While B C s = (if B s then While B C (C s) else s)"
paulson@7287
  1769
where the well-founded relation can be chosen after B and C have been given.
wenzelm@6563
  1770
wenzelm@7215
  1771
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
  1772
INCOMPATIBILITY: while [] and infix # syntax is still there, of
wenzelm@7215
  1773
course, ML tools referring to List.list.op # etc. have to be adapted;
wenzelm@7215
  1774
wenzelm@7238
  1775
* HOL_quantifiers flag superseded by "HOL" print mode, which is
wenzelm@7238
  1776
disabled by default; run isabelle with option -m HOL to get back to
wenzelm@7238
  1777
the original Gordon/HOL-style output;
wenzelm@7238
  1778
wenzelm@7238
  1779
* HOL/Ord.thy: new bounded quantifier syntax (input only): ALL x<y. P,
wenzelm@7238
  1780
ALL x<=y. P, EX x<y. P, EX x<=y. P;
wenzelm@7238
  1781
wenzelm@7238
  1782
* HOL basic syntax simplified (more orthogonal): all variants of
wenzelm@7238
  1783
All/Ex now support plain / symbolic / HOL notation; plain syntax for
wenzelm@7238
  1784
Eps operator is provided as well: "SOME x. P[x]";
wenzelm@7238
  1785
berghofe@7320
  1786
* HOL/Sum.thy: sum_case has been moved to HOL/Datatype;
wenzelm@7261
  1787
wenzelm@7280
  1788
* HOL/Univ.thy: infix syntax <*>, <+>, <**>, <+> eliminated and made
wenzelm@7280
  1789
thus available for user theories;
wenzelm@7280
  1790
wenzelm@7300
  1791
* HOLCF/IOA/Sequents: renamed 'Cons' to 'Consq' to avoid clash with
wenzelm@7300
  1792
HOL/List; hardly an INCOMPATIBILITY since '>>' syntax is used all the
wenzelm@7300
  1793
time;
wenzelm@7300
  1794
wenzelm@7986
  1795
* HOL: new tactic smp_tac: int -> int -> tactic, which applies spec
wenzelm@7986
  1796
several times and then mp;
oheimb@7492
  1797
wenzelm@7215
  1798
paulson@7113
  1799
*** LK ***
paulson@7113
  1800
wenzelm@7215
  1801
* the notation <<...>> is now available as a notation for sequences of
wenzelm@7215
  1802
formulas;
paulson@7113
  1803
paulson@7113
  1804
* the simplifier is now installed
paulson@7113
  1805
wenzelm@8729
  1806
* the axiom system has been generalized (thanks to Soren Heilmann)
paulson@7113
  1807
paulson@7113
  1808
* the classical reasoner now has a default rule database
paulson@7113
  1809
paulson@7113
  1810
paulson@6064
  1811
*** ZF ***
paulson@6064
  1812
paulson@6064
  1813
* new primrec section allows primitive recursive functions to be given
wenzelm@6269
  1814
directly (as in HOL) over datatypes and the natural numbers;
paulson@6064
  1815
wenzelm@6269
  1816
* new tactics induct_tac and exhaust_tac for induction (or case
wenzelm@6269
  1817
analysis) over datatypes and the natural numbers;
paulson@6064
  1818
paulson@6064
  1819
* the datatype declaration of type T now defines the recursor T_rec;
paulson@6064
  1820
paulson@6141
  1821
* simplification automatically does freeness reasoning for datatype
wenzelm@6269
  1822
constructors;
paulson@6141
  1823
wenzelm@6269
  1824
* automatic type-inference, with AddTCs command to insert new
wenzelm@6269
  1825
type-checking rules;
paulson@6155
  1826
wenzelm@6269
  1827
* datatype introduction rules are now added as Safe Introduction rules
wenzelm@6269
  1828
to the claset;
paulson@6155
  1829
wenzelm@6269
  1830
* the syntax "if P then x else y" is now available in addition to
wenzelm@6269
  1831
if(P,x,y);
wenzelm@6269
  1832
paulson@6069
  1833
wenzelm@6343
  1834
*** Internal programming interfaces ***
wenzelm@6343
  1835
wenzelm@7919
  1836
* tuned simplifier trace output; new flag debug_simp;
wenzelm@7919
  1837
wenzelm@7420
  1838
* structures Vartab / Termtab (instances of TableFun) offer efficient
wenzelm@7420
  1839
tables indexed by indexname_ord / term_ord (compatible with aconv);
wenzelm@7420
  1840
wenzelm@6386
  1841
* AxClass.axclass_tac lost the theory argument;
wenzelm@6386
  1842
wenzelm@6343
  1843
* tuned current_goals_markers semantics: begin / end goal avoids
wenzelm@6343
  1844
printing empty lines;
wenzelm@6343
  1845
wenzelm@6343
  1846
* removed prs and prs_fn hook, which was broken because it did not
wenzelm@6343
  1847
include \n in its semantics, forcing writeln to add one
wenzelm@6343
  1848
uncoditionally; replaced prs_fn by writeln_fn; consider std_output:
wenzelm@6343
  1849
string -> unit if you really want to output text without newline;
wenzelm@6343
  1850
wenzelm@6343
  1851
* Symbol.output subject to print mode; INCOMPATIBILITY: defaults to
wenzelm@6343
  1852
plain output, interface builders may have to enable 'isabelle_font'
wenzelm@6343
  1853
mode to get Isabelle font glyphs as before;
wenzelm@6343
  1854
wenzelm@6343
  1855
* refined token_translation interface; INCOMPATIBILITY: output length
wenzelm@6343
  1856
now of type real instead of int;
wenzelm@6343
  1857
wenzelm@7196
  1858
* theory loader actions may be traced via new ThyInfo.add_hook
wenzelm@7196
  1859
interface (see src/Pure/Thy/thy_info.ML); example application: keep
wenzelm@7196
  1860
your own database of information attached to *whole* theories -- as
wenzelm@7196
  1861
opposed to intra-theory data slots offered via TheoryDataFun;
wenzelm@7196
  1862
wenzelm@7647
  1863
* proper handling of dangling sort hypotheses (at last!);
wenzelm@7647
  1864
Thm.strip_shyps and Drule.strip_shyps_warning take care of removing
wenzelm@7647
  1865
extra sort hypotheses that can be witnessed from the type signature;
wenzelm@7986
  1866
the force_strip_shyps flag is gone, any remaining shyps are simply
wenzelm@7986
  1867
left in the theorem (with a warning issued by strip_shyps_warning);
wenzelm@7647
  1868
wenzelm@6343
  1869
paulson@6064
  1870
wenzelm@5781
  1871
New in Isabelle98-1 (October 1998)
wenzelm@5781
  1872
----------------------------------
wenzelm@5781
  1873
wenzelm@5127
  1874
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4842
  1875
wenzelm@5726
  1876
* several changes of automated proof tools;
wenzelm@5373
  1877
wenzelm@5726
  1878
* HOL: major changes to the inductive and datatype packages, including
wenzelm@5726
  1879
some minor incompatibilities of theory syntax;
berghofe@5214
  1880
wenzelm@5726
  1881
* HOL: renamed r^-1 to 'converse' from 'inverse'; 'inj_onto' is now
wenzelm@5217
  1882
called `inj_on';
paulson@5160
  1883
nipkow@5275
  1884
* HOL: removed duplicate thms in Arith:
nipkow@5275
  1885
  less_imp_add_less  should be replaced by  trans_less_add1
nipkow@5275
  1886
  le_imp_add_le      should be replaced by  trans_le_add1
paulson@5160
  1887
wenzelm@5726
  1888
* HOL: unary minus is now overloaded (new type constraints may be
wenzelm@5726
  1889
required);
paulson@5490
  1890
wenzelm@5726
  1891
* HOL and ZF: unary minus for integers is now #- instead of #~.  In
wenzelm@5726
  1892
ZF, expressions such as n#-1 must be changed to n#- 1, since #-1 is
wenzelm@5726
  1893
now taken as an integer constant.
paulson@5541
  1894
wenzelm@5726
  1895
* Pure: ML function 'theory_of' renamed to 'theory';
wenzelm@5397
  1896
wenzelm@5363
  1897
wenzelm@5127
  1898
*** Proof tools ***
nipkow@4880
  1899
nipkow@5657
  1900
* Simplifier:
nipkow@5657
  1901
  1. Asm_full_simp_tac is now more aggressive.
nipkow@5657
  1902
     1. It will sometimes reorient premises if that increases their power to
nipkow@5657
  1903
        simplify.
nipkow@5657
  1904
     2. It does no longer proceed strictly from left to right but may also
nipkow@5657
  1905
        rotate premises to achieve further simplification.
nipkow@5657
  1906
     For compatibility reasons there is now Asm_lr_simp_tac which is like the
nipkow@5657
  1907
     old Asm_full_simp_tac in that it does not rotate premises.
nipkow@5657
  1908
  2. The simplifier now knows a little bit about nat-arithmetic.
nipkow@4880
  1909
wenzelm@5127
  1910
* Classical reasoner: wrapper mechanism for the classical reasoner now
wenzelm@5127
  1911
allows for selected deletion of wrappers, by introduction of names for
wenzelm@5127
  1912
wrapper functionals.  This implies that addbefore, addSbefore,
wenzelm@5127
  1913
addaltern, and addSaltern now take a pair (name, tactic) as argument,
wenzelm@5127
  1914
and that adding two tactics with the same name overwrites the first
wenzelm@5127
  1915
one (emitting a warning).
oheimb@4824
  1916
  type wrapper = (int -> tactic) -> (int -> tactic)
oheimb@4649
  1917
  setWrapper, setSWrapper, compWrapper and compSWrapper are replaced by
oheimb@4824
  1918
  addWrapper, addSWrapper: claset * (string * wrapper) -> claset
oheimb@4824
  1919
  delWrapper, delSWrapper: claset *  string            -> claset
oheimb@4649
  1920
  getWrapper is renamed to appWrappers, getSWrapper to appSWrappers;
oheimb@4649
  1921
wenzelm@5705
  1922
* Classical reasoner: addbefore/addSbefore now have APPEND/ORELSE
wenzelm@5726
  1923
semantics; addbefore now affects only the unsafe part of step_tac
wenzelm@5726
  1924
etc.; this affects addss/auto_tac/force_tac, so EXISTING PROOFS MAY
wenzelm@5726
  1925
FAIL, but proofs should be fixable easily, e.g. by replacing Auto_tac
wenzelm@5726
  1926
by Force_tac;
oheimb@5524
  1927
wenzelm@5726
  1928
* Classical reasoner: setwrapper to setWrapper and compwrapper to
wenzelm@5726
  1929
compWrapper; added safe wrapper (and access functions for it);
oheimb@5524
  1930
wenzelm@5127
  1931
* HOL/split_all_tac is now much faster and fails if there is nothing
wenzelm@5726
  1932
to split.  Some EXISTING PROOFS MAY REQUIRE ADAPTION because the order
wenzelm@5726
  1933
and the names of the automatically generated variables have changed.
wenzelm@5726
  1934
split_all_tac has moved within claset() from unsafe wrappers to safe
wenzelm@5726
  1935
wrappers, which means that !!-bound variables are split much more
wenzelm@5726
  1936
aggressively, and safe_tac and clarify_tac now split such variables.
wenzelm@5726
  1937
If this splitting is not appropriate, use delSWrapper "split_all_tac".
wenzelm@5726
  1938
Note: the same holds for record_split_tac, which does the job of
wenzelm@5726
  1939
split_all_tac for record fields.
wenzelm@5127
  1940
wenzelm@5726
  1941
* HOL/Simplifier: Rewrite rules for case distinctions can now be added
wenzelm@5726
  1942
permanently to the default simpset using Addsplits just like
wenzelm@5726
  1943
Addsimps. They can be removed via Delsplits just like
wenzelm@5726
  1944
Delsimps. Lower-case versions are also available.
wenzelm@5127
  1945
wenzelm@5726
  1946
* HOL/Simplifier: The rule split_if is now part of the default
wenzelm@5726
  1947
simpset. This means that the simplifier will eliminate all occurrences
wenzelm@5726
  1948
of if-then-else in the conclusion of a goal. To prevent this, you can
wenzelm@5726
  1949
either remove split_if completely from the default simpset by
wenzelm@5726
  1950
`Delsplits [split_if]' or remove it in a specific call of the
wenzelm@5726
  1951
simplifier using `... delsplits [split_if]'.  You can also add/delete
wenzelm@5726
  1952
other case splitting rules to/from the default simpset: every datatype
wenzelm@5726
  1953
generates suitable rules `split_t_case' and `split_t_case_asm' (where
wenzelm@5726
  1954
t is the name of the datatype).
wenzelm@5127
  1955
wenzelm@5726
  1956
* Classical reasoner / Simplifier combination: new force_tac (and
wenzelm@5127
  1957
derivatives Force_tac, force) combines rewriting and classical
wenzelm@5127
  1958
reasoning (and whatever other tools) similarly to auto_tac, but is
wenzelm@5726
  1959
aimed to solve the given subgoal completely.
wenzelm@5127
  1960
wenzelm@5127
  1961
wenzelm@5127
  1962
*** General ***
wenzelm@5127
  1963
wenzelm@5217
  1964
* new top-level commands `Goal' and `Goalw' that improve upon `goal'
wenzelm@5127
  1965
and `goalw': the theory is no longer needed as an explicit argument -
wenzelm@5127
  1966
the current theory context is used; assumptions are no longer returned
wenzelm@5127
  1967
at the ML-level unless one of them starts with ==> or !!; it is
wenzelm@5217
  1968
recommended to convert to these new commands using isatool fixgoal
wenzelm@5217
  1969
(backup your sources first!);
wenzelm@4842
  1970
wenzelm@5217
  1971
* new top-level commands 'thm' and 'thms' for retrieving theorems from
wenzelm@5207
  1972
the current theory context, and 'theory' to lookup stored theories;
paulson@4806
  1973
paulson@5722
  1974
* new theory section 'locale' for declaring constants, assumptions and
paulson@5722
  1975
definitions that have local scope;
paulson@5722
  1976
wenzelm@5127
  1977
* new theory section 'nonterminals' for purely syntactic types;
wenzelm@4858
  1978
wenzelm@5127
  1979
* new theory section 'setup' for generic ML setup functions
wenzelm@5127
  1980
(e.g. package initialization);
wenzelm@4869
  1981
wenzelm@5131
  1982
* the distribution now includes Isabelle icons: see
wenzelm@5131
  1983
lib/logo/isabelle-{small,tiny}.xpm;
wenzelm@5131
  1984
wenzelm@5363
  1985
* isatool install - install binaries with absolute references to
wenzelm@5363
  1986
ISABELLE_HOME/bin;
wenzelm@5363
  1987
wenzelm@5572
  1988
* isatool logo -- create instances of the Isabelle logo (as EPS);
wenzelm@5572
  1989
wenzelm@5407
  1990
* print mode 'emacs' reserved for Isamode;
wenzelm@5407
  1991
wenzelm@5726
  1992
* support multiple print (ast) translations per constant name;
wenzelm@5726
  1993
wenzelm@6925
  1994
* theorems involving oracles are now printed with a suffixed [!];
wenzelm@6925
  1995
wenzelm@4711
  1996
paulson@4661
  1997
*** HOL ***
paulson@4661
  1998
wenzelm@5710
  1999
* there is now a tutorial on Isabelle/HOL (do 'isatool doc tutorial');
nipkow@5709
  2000
wenzelm@5217
  2001
* HOL/inductive package reorganized and improved: now supports mutual
paulson@5267
  2002
definitions such as
wenzelm@5217
  2003
wenzelm@5217
  2004
  inductive EVEN ODD
wenzelm@5217
  2005
    intrs
wenzelm@5217
  2006
      null "0 : EVEN"
wenzelm@5217
  2007
      oddI "n : EVEN ==> Suc n : ODD"
wenzelm@5217
  2008
      evenI "n : ODD ==> Suc n : EVEN"
wenzelm@5217
  2009
wenzelm@5217
  2010
new theorem list "elims" contains an elimination rule for each of the
wenzelm@5217
  2011
recursive sets; inductive definitions now handle disjunctive premises
wenzelm@5217
  2012
correctly (also ZF);
berghofe@5214
  2013
wenzelm@5217
  2014
INCOMPATIBILITIES: requires Inductive as an ancestor; component
wenzelm@5217
  2015
"mutual_induct" no longer exists - the induction rule is always
wenzelm@5217
  2016
contained in "induct";
wenzelm@5217
  2017
wenzelm@5217
  2018
wenzelm@5217
  2019
* HOL/datatype package re-implemented and greatly improved: now
paulson@5267
  2020
supports mutually recursive datatypes such as
wenzelm@5217
  2021
wenzelm@5217
  2022
  datatype
wenzelm@5217
  2023
    'a aexp = IF_THEN_ELSE ('a bexp) ('a aexp) ('a aexp)
wenzelm@5217
  2024
            | SUM ('a aexp) ('a aexp)
wenzelm@5217
  2025
            | DIFF ('a aexp) ('a aexp)
wenzelm@5217
  2026
            | NUM 'a
wenzelm@5217
  2027
  and
wenzelm@5217
  2028
    'a bexp = LESS ('a aexp) ('a aexp)
wenzelm@5217
  2029
            | AND ('a bexp) ('a bexp)
wenzelm@5217
  2030
            | OR ('a bexp) ('a bexp)
wenzelm@5217
  2031
paulson@5267
  2032
as well as indirectly recursive datatypes such as
berghofe@5214
  2033
wenzelm@5217
  2034
  datatype
wenzelm@5217
  2035
    ('a, 'b) term = Var 'a
wenzelm@5217
  2036
                  | App 'b ((('a, 'b) term) list)
berghofe@5214
  2037
wenzelm@5217
  2038
The new tactic  mutual_induct_tac [<var_1>, ..., <var_n>] i  performs
wenzelm@5217
  2039
induction on mutually / indirectly recursive datatypes.
wenzelm@5217
  2040
wenzelm@5217
  2041
Primrec equations are now stored in theory and can be accessed via
wenzelm@5217
  2042
<function_name>.simps.
wenzelm@5217
  2043
wenzelm@5217
  2044
INCOMPATIBILITIES:
berghofe@5214
  2045
wenzelm@5217
  2046
  - Theories using datatypes must now have theory Datatype as an
wenzelm@5217
  2047
    ancestor.
wenzelm@5217
  2048
  - The specific <typename>.induct_tac no longer exists - use the
wenzelm@5217
  2049
    generic induct_tac instead.
berghofe@5226
  2050
  - natE has been renamed to nat.exhaust - use exhaust_tac
wenzelm@5217
  2051
    instead of res_inst_tac ... natE. Note that the variable
berghofe@5226
  2052
    names in nat.exhaust differ from the names in natE, this
wenzelm@5217
  2053
    may cause some "fragile" proofs to fail.
wenzelm@5217
  2054
  - The theorems split_<typename>_case and split_<typename>_case_asm
wenzelm@5217
  2055
    have been renamed to <typename>.split and <typename>.split_asm.
wenzelm@5217
  2056
  - Since default sorts of type variables are now handled correctly,
wenzelm@5217
  2057
    some datatype definitions may have to be annotated with explicit
wenzelm@5217
  2058
    sort constraints.
wenzelm@5217
  2059
  - Primrec definitions no longer require function name and type
wenzelm@5217
  2060
    of recursive argument.
berghofe@5214
  2061
wenzelm@5217
  2062
Consider using isatool fixdatatype to adapt your theories and proof
wenzelm@5217
  2063
scripts to the new package (backup your sources first!).
wenzelm@5217
  2064
wenzelm@5217
  2065
wenzelm@5726
  2066
* HOL/record package: considerably improved implementation; now
wenzelm@5726
  2067
includes concrete syntax for record types, terms, updates; theorems
wenzelm@5726
  2068
for surjective pairing and splitting !!-bound record variables; proof
wenzelm@5726
  2069
support is as follows:
wenzelm@5726
  2070
wenzelm@5726
  2071
  1) standard conversions (selectors or updates applied to record
wenzelm@5726
  2072
constructor terms) are part of the standard simpset;
wenzelm@5726
  2073
wenzelm@5726
  2074
  2) inject equations of the form ((x, y) = (x', y')) == x=x' & y=y' are
wenzelm@5726
  2075
made part of standard simpset and claset via addIffs;
wenzelm@5726
  2076
wenzelm@5726
  2077
  3) a tactic for record field splitting (record_split_tac) is part of
wenzelm@5726
  2078
the standard claset (addSWrapper);
wenzelm@5726
  2079
wenzelm@5726
  2080
To get a better idea about these rules you may retrieve them via
wenzelm@5726
  2081
something like 'thms "foo.simps"' or 'thms "foo.iffs"', where "foo" is
wenzelm@5726
  2082
the name of your record type.
wenzelm@5726
  2083
wenzelm@5726
  2084
The split tactic 3) conceptually simplifies by the following rule:
wenzelm@5726
  2085
wenzelm@5726
  2086
  "(!!x. PROP ?P x) == (!!a b. PROP ?P (a, b))"
wenzelm@5726
  2087
wenzelm@5726
  2088
Thus any record variable that is bound by meta-all will automatically
wenzelm@5726
  2089
blow up into some record constructor term, consequently the
wenzelm@5726
  2090
simplifications of 1), 2) apply.  Thus force_tac, auto_tac etc. shall
wenzelm@5726
  2091
solve record problems automatically.
wenzelm@5726
  2092
berghofe@5214
  2093
wenzelm@5125
  2094
* reorganized the main HOL image: HOL/Integ and String loaded by
wenzelm@5125
  2095
default; theory Main includes everything;
wenzelm@5125
  2096
paulson@5650
  2097
* automatic simplification of integer sums and comparisons, using cancellation;
paulson@5650
  2098
oheimb@5526
  2099
* added option_map_eq_Some and not_Some_eq to the default simpset and claset;
wenzelm@5127
  2100
wenzelm@5127
  2101
* added disj_not1 = "(~P | Q) = (P --> Q)" to the default simpset;
wenzelm@5127
  2102
wenzelm@5127
  2103
* many new identities for unions, intersections, set difference, etc.;
wenzelm@5127
  2104
wenzelm@5127
  2105
* expand_if, expand_split, expand_sum_case and expand_nat_case are now
wenzelm@5127
  2106
called split_if, split_split, split_sum_case and split_nat_case (to go
wenzelm@5127
  2107
with add/delsplits);
wenzelm@5125
  2108
wenzelm@5127
  2109
* HOL/Prod introduces simplification procedure unit_eq_proc rewriting
wenzelm@5127
  2110
(?x::unit) = (); this is made part of the default simpset, which COULD
wenzelm@5127
  2111
MAKE EXISTING PROOFS FAIL under rare circumstances (consider
wenzelm@5207
  2112
'Delsimprocs [unit_eq_proc];' as last resort); also note that
wenzelm@5207
  2113
unit_abs_eta_conv is added in order to counter the effect of
wenzelm@5207
  2114
unit_eq_proc on (%u::unit. f u), replacing it by f rather than by
wenzelm@5207
  2115
%u.f();
wenzelm@5125
  2116
wenzelm@5217
  2117
* HOL/Fun INCOMPATIBILITY: `inj_onto' is now called `inj_on' (which
wenzelm@5217
  2118
makes more sense);
berghofe@5109
  2119
paulson@5475
  2120
* HOL/Set INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
  2121
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
  2122
  disjointness reasoning but breaking a few old proofs.
paulson@5267
  2123
wenzelm@5217
  2124
* HOL/Relation INCOMPATIBILITY: renamed the relational operator r^-1
wenzelm@5217
  2125
to 'converse' from 'inverse' (for compatibility with ZF and some
wenzelm@5217
  2126
literature);
wenzelm@5085
  2127
wenzelm@5127
  2128
* HOL/recdef can now declare non-recursive functions, with {} supplied as
wenzelm@5127
  2129
the well-founded relation;
oheimb@4838
  2130
paulson@5490
  2131
* HOL/Set INCOMPATIBILITY: the complement of set A is now written -A instead of
paulson@5490
  2132
    Compl A.  The "Compl" syntax remains available as input syntax for this
paulson@5490
  2133
    release ONLY.
paulson@5490
  2134
wenzelm@5127
  2135
* HOL/Update: new theory of function updates:
wenzelm@5127
  2136
    f(a:=b) == %x. if x=a then b else f x
wenzelm@5127
  2137
may also be iterated as in f(a:=b,c:=d,...);
nipkow@5077
  2138
wenzelm@5127
  2139
* HOL/Vimage: new theory for inverse image of a function, syntax f-``B;
paulson@4899
  2140
nipkow@5282
  2141
* HOL/List:
nipkow@5282
  2142
  - new function list_update written xs[i:=v] that updates the i-th
nipkow@5282
  2143
    list position. May also be iterated as in xs[i:=a,j:=b,...].
nipkow@5428
  2144
  - new function `upt' written [i..j(] which generates the list
nipkow@5428
  2145
    [i,i+1,...,j-1], i.e. the upper bound is excluded. To include the upper
nipkow@5428
  2146
    bound write [i..j], which is a shorthand for [i..j+1(].
nipkow@5282
  2147
  - new lexicographic orderings and corresponding wellfoundedness theorems.
paulson@4779
  2148
wenzelm@5127
  2149
* HOL/Arith:
wenzelm@5127
  2150
  - removed 'pred' (predecessor) function;
wenzelm@5127
  2151
  - generalized some theorems about n-1;
wenzelm@5127
  2152
  - many new laws about "div" and "mod";
wenzelm@5127
  2153
  - new laws about greatest common divisors (see theory ex/Primes);
oheimb@4766
  2154
wenzelm@5127
  2155
* HOL/Relation: renamed the relational operator r^-1 "converse"
wenzelm@4842
  2156
instead of "inverse";
wenzelm@4711
  2157
nipkow@5651
  2158
* HOL/Induct/Multiset: a theory of multisets, including the wellfoundedness
nipkow@5651
  2159
  of the multiset ordering;
nipkow@5651
  2160
wenzelm@5127
  2161
* directory HOL/Real: a construction of the reals using Dedekind cuts
nipkow@5651
  2162
  (not included by default);
nipkow@4835
  2163
wenzelm@5127
  2164
* directory HOL/UNITY: Chandy and Misra's UNITY formalism;
wenzelm@4711
  2165
nipkow@5651
  2166
* directory HOL/Hoare: a new version of Hoare logic which permits many-sorted
nipkow@5651
  2167
  programs, i.e. different program variables may have different types.
nipkow@5651
  2168
paulson@5142
  2169
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
  2170
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
  2171
  Now rew can involve either definitions or equalities (either == or =).
wenzelm@5002
  2172
wenzelm@5363
  2173
paulson@4879
  2174
*** ZF ***
paulson@4879
  2175
paulson@5332
  2176
* theory Main includes everything; INCOMPATIBILITY: theory ZF.thy contains
paulson@5332
  2177
  only the theorems proved on ZF.ML;
paulson@5160
  2178
paulson@5475
  2179
* ZF INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
  2180
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
  2181
  disjointness reasoning but breaking a few old proofs.
paulson@5267
  2182
paulson@5160
  2183
* ZF/Update: new theory of function updates
paulson@5160
  2184
    with default rewrite rule  f(x:=y) ` z = if(z=x, y, f`z)
paulson@5160
  2185
  may also be iterated as in f(a:=b,c:=d,...);
paulson@5160
  2186
paulson@4879
  2187
* in  let x=t in u(x), neither t nor u(x) has to be an FOL term.
oheimb@4649
  2188
paulson@5142
  2189
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
  2190
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
  2191
  Now rew can involve either definitions or equalities (either == or =).
paulson@5142
  2192
paulson@5160
  2193
* case_tac provided for compatibility with HOL
paulson@5160
  2194
    (like the old excluded_middle_tac, but with subgoals swapped)
paulson@5160
  2195
wenzelm@4842
  2196
wenzelm@5127
  2197
*** Internal programming interfaces ***
wenzelm@5002
  2198
wenzelm@5251
  2199
* Pure: several new basic modules made available for general use, see
wenzelm@5251
  2200
also src/Pure/README;
wenzelm@5207
  2201
wenzelm@5008
  2202
* improved the theory data mechanism to support encapsulation (data
wenzelm@5008
  2203
kind name replaced by private Object.kind, acting as authorization
wenzelm@5373
  2204
key); new type-safe user interface via functor TheoryDataFun; generic
wenzelm@5373
  2205
print_data function becomes basically useless;
wenzelm@5002
  2206
wenzelm@5251
  2207
* removed global_names compatibility flag -- all theory declarations
wenzelm@5251
  2208
are qualified by default;
wenzelm@5251
  2209
wenzelm@5085
  2210
* module Pure/Syntax now offers quote / antiquote translation
wenzelm@5085
  2211
functions (useful for Hoare logic etc. with implicit dependencies);
wenzelm@5373
  2212
see HOL/ex/Antiquote for an example use;
wenzelm@5085
  2213
wenzelm@5127
  2214
* Simplifier now offers conversions (asm_)(full_)rewrite: simpset ->
wenzelm@5127
  2215
cterm -> thm;
wenzelm@5127
  2216
wenzelm@5207
  2217
* new tactical CHANGED_GOAL for checking that a tactic modifies a
wenzelm@5207
  2218
subgoal;
paulson@5142
  2219
wenzelm@5251
  2220
* Display.print_goals function moved to Locale.print_goals;
wenzelm@5251
  2221
wenzelm@5731
  2222
* standard print function for goals supports current_goals_markers
wenzelm@5731
  2223
variable for marking begin of proof, end of proof, start of goal; the
wenzelm@5731
  2224
default is ("", "", ""); setting current_goals_markers := ("<proof>",
wenzelm@5731
  2225
"</proof>", "<goal>") causes SGML like tagged proof state printing,
wenzelm@5731
  2226
for example;
wenzelm@5731
  2227
wenzelm@5002
  2228
wenzelm@5002
  2229
wenzelm@4410
  2230
New in Isabelle98 (January 1998)
wenzelm@4410
  2231
--------------------------------
wenzelm@4410
  2232
wenzelm@4410
  2233
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4410
  2234
wenzelm@4410
  2235
* changed lexical syntax of terms / types: dots made part of long
wenzelm@4410
  2236
identifiers, e.g. "%x.x" no longer possible, should be "%x. x";
wenzelm@4410
  2237
wenzelm@4410
  2238
* simpset (and claset) reference variable replaced by functions
wenzelm@4410
  2239
simpset / simpset_ref;
wenzelm@4410
  2240
wenzelm@4410
  2241
* no longer supports theory aliases (via merge) and non-trivial
wenzelm@4410
  2242
implicit merge of thms' signatures;
wenzelm@4410
  2243
wenzelm@4410
  2244
* most internal names of constants changed due to qualified names;
wenzelm@4410
  2245
wenzelm@4410
  2246
* changed Pure/Sequence interface (see Pure/seq.ML);
wenzelm@4410
  2247
wenzelm@3454
  2248
paulson@3715
  2249
*** General Changes ***
paulson@3715
  2250
wenzelm@4174
  2251
* hierachically structured name spaces (for consts, types, axms, thms
wenzelm@3943
  2252
etc.); new lexical class 'longid' (e.g. Foo.bar.x) may render much of
wenzelm@4108
  2253
old input syntactically incorrect (e.g. "%x.x"); COMPATIBILITY:
wenzelm@4108
  2254
isatool fixdots ensures space after dots (e.g. "%x. x"); set
wenzelm@4174
  2255
long_names for fully qualified output names; NOTE: ML programs
wenzelm@4174
  2256
(special tactics, packages etc.) referring to internal names may have
wenzelm@4174
  2257
to be adapted to cope with fully qualified names; in case of severe
wenzelm@4174
  2258
backward campatibility problems try setting 'global_names' at compile
wenzelm@4174
  2259
time to have enrything declared within a flat name space; one may also
wenzelm@4174
  2260
fine tune name declarations in theories via the 'global' and 'local'
wenzelm@4174
  2261
section;
wenzelm@4108
  2262
wenzelm@4108
  2263
* reimplemented the implicit simpset and claset using the new anytype
wenzelm@4108
  2264
data filed in signatures; references simpset:simpset ref etc. are
wenzelm@4108
  2265
replaced by functions simpset:unit->simpset and
wenzelm@4108
  2266
simpset_ref:unit->simpset ref; COMPATIBILITY: use isatool fixclasimp
wenzelm@4108
  2267
to patch your ML files accordingly;
paulson@3856
  2268
wenzelm@3857
  2269
* HTML output now includes theory graph data for display with Java
wenzelm@3857
  2270
applet or isatool browser; data generated automatically via isatool
wenzelm@3901
  2271
usedir (see -i option, ISABELLE_USEDIR_OPTIONS);
wenzelm@3857
  2272
paulson@3856
  2273
* defs may now be conditional; improved rewrite_goals_tac to handle
paulson@3856
  2274
conditional equations;
paulson@3856
  2275
wenzelm@4174
  2276
* defs now admits additional type arguments, using TYPE('a) syntax;
wenzelm@4174
  2277
wenzelm@3901
  2278
* theory aliases via merge (e.g. M=A+B+C) no longer supported, always
wenzelm@3901
  2279
creates a new theory node; implicit merge of thms' signatures is
wenzelm@4112
  2280
restricted to 'trivial' ones; COMPATIBILITY: one may have to use
wenzelm@3901
  2281
transfer:theory->thm->thm in (rare) cases;
wenzelm@3901
  2282
wenzelm@3968
  2283
* improved handling of draft signatures / theories; draft thms (and
wenzelm@3968
  2284
ctyps, cterms) are automatically promoted to real ones;
wenzelm@3968
  2285
wenzelm@3901
  2286
* slightly changed interfaces for oracles: admit many per theory, named
wenzelm@3901
  2287
(e.g. oracle foo = mlfun), additional name argument for invoke_oracle;
wenzelm@3901
  2288
wenzelm@3901
  2289
* print_goals: optional output of const types (set show_consts and
wenzelm@3901
  2290
show_types);
wenzelm@3851
  2291
wenzelm@4388
  2292
* improved output of warnings (###) and errors (***);
wenzelm@3697
  2293
paulson@4178
  2294
* subgoal_tac displays a warning if the new subgoal has type variables;
paulson@4178
  2295
paulson@3715
  2296
* removed old README and Makefiles;
wenzelm@3697
  2297
paulson@3856
  2298
* replaced print_goals_ref hook by print_current_goals_fn and result_error_fn;
wenzelm@3670
  2299
paulson@3715
  2300
* removed obsolete init_pps and init_database;
paulson@3715
  2301
paulson@3715
  2302
* deleted the obsolete tactical STATE, which was declared by
paulson@3715
  2303
    fun STATE tacfun st = tacfun st st;
paulson@3715
  2304
wenzelm@4388
  2305
* cd and use now support path variables, e.g. $ISABELLE_HOME, or ~
wenzelm@4388
  2306
(which abbreviates $HOME);
wenzelm@4269
  2307
wenzelm@4269
  2308
* changed Pure/Sequence interface (see Pure/seq.ML); COMPATIBILITY:
wenzelm@4269
  2309
use isatool fixseq to adapt your ML programs (this works for fully
wenzelm@4269
  2310
qualified references to the Sequence structure only!);
wenzelm@4269
  2311
wenzelm@4381
  2312
* use_thy no longer requires writable current directory; it always
wenzelm@4381
  2313
reloads .ML *and* .thy file, if either one is out of date;
wenzelm@4269
  2314
paulson@3715
  2315
paulson@3715
  2316
*** Classical Reasoner ***
paulson@3715
  2317
wenzelm@3744
  2318
* Clarify_tac, clarify_tac, clarify_step_tac, Clarify_step_tac: new
wenzelm@3744
  2319
tactics that use classical reasoning to simplify a subgoal without
wenzelm@3744
  2320
splitting it into several subgoals;
paulson@3715
  2321
paulson@3719
  2322
* Safe_tac: like safe_tac but uses the default claset;
paulson@3719
  2323
paulson@3715
  2324
paulson@3715
  2325
*** Simplifier ***
paulson@3715
  2326
paulson@3715
  2327
* added simplification meta rules:
paulson@3715
  2328
    (asm_)(full_)simplify: simpset -> thm -> thm;
paulson@3715
  2329
paulson@3715
  2330
* simplifier.ML no longer part of Pure -- has to be loaded by object
paulson@3715
  2331
logics (again);
paulson@3715
  2332
paulson@3715
  2333
* added prems argument to simplification procedures;
paulson@3715
  2334
paulson@4325
  2335
* HOL, FOL, ZF: added infix function `addsplits':
paulson@4325
  2336
  instead of `<simpset> setloop (split_tac <thms>)'
paulson@4325
  2337
  you can simply write `<simpset> addsplits <thms>'
paulson@4325
  2338
paulson@3715
  2339
paulson@3715
  2340
*** Syntax ***
paulson@3715
  2341
wenzelm@4174
  2342
* TYPE('a) syntax for type reflection terms;
wenzelm@4174
  2343
wenzelm@3985
  2344
* no longer handles consts with name "" -- declare as 'syntax' instead;
paulson@3856
  2345
paulson@3856
  2346
* pretty printer: changed order of mixfix annotation preference (again!);
wenzelm@3846
  2347
paulson@3715
  2348
* Pure: fixed idt/idts vs. pttrn/pttrns syntactic categories;
paulson@3715
  2349
paulson@3715
  2350
paulson@3715
  2351
*** HOL ***
paulson@3715
  2352
wenzelm@5726
  2353
* HOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  2354
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
  2355
nipkow@4035
  2356
* HOL/TLA: Stephan Merz's formalization of Lamport's Temporal Logic of Actions;
wenzelm@3985
  2357
wenzelm@3985
  2358
* HOL/Auth: new protocol proofs including some for the Internet
nipkow@4035
  2359
  protocol TLS;
wenzelm@3985
  2360
wenzelm@4125
  2361
* HOL/Map: new theory of `maps' a la VDM;
nipkow@3982
  2362
wenzelm@4335
  2363
* HOL/simplifier: simplification procedures nat_cancel_sums for
wenzelm@4335
  2364
cancelling out common nat summands from =, <, <= (in)equalities, or
wenzelm@4335
  2365
differences; simplification procedures nat_cancel_factor for
wenzelm@4335
  2366
cancelling common factor from =, <, <= (in)equalities over natural
wenzelm@4373
  2367
sums; nat_cancel contains both kinds of procedures, it is installed by
wenzelm@4373
  2368
default in Arith.thy -- this COULD MAKE EXISTING PROOFS FAIL;
wenzelm@4335
  2369
nipkow@3580
  2370
* HOL/simplifier: terms of the form
paulson@4325
  2371
  `? x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x)'  (or t=x)
nipkow@3580
  2372
  are rewritten to
nipkow@4035
  2373
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t)',
nipkow@4035
  2374
  and those of the form
paulson@4325
  2375
  `! x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x) --> R(x)'  (or t=x)
nipkow@4035
  2376
  are rewritten to
nipkow@4035
  2377
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t) --> R(t)',
nipkow@4035
  2378
nipkow@4035
  2379
* HOL/datatype
nipkow@4035
  2380
  Each datatype `t' now comes with a theorem `split_t_case' of the form
nipkow@3580
  2381
nipkow@4035
  2382
  P(t_case f1 ... fn x) =
nipkow@4035
  2383
     ( (!y1 ... ym1. x = C1 y1 ... ym1 --> P(f1 y1 ... ym1)) &
nipkow@4035
  2384
        ...
oheimb@4189
  2385
       (!y1 ... ymn. x = Cn y1 ... ymn --> P(f1 y1 ... ymn))
nipkow@4035
  2386
     )
nipkow@4035
  2387
oheimb@4930
  2388
  and a theorem `split_t_case_asm' of the form
oheimb@4189
  2389
oheimb@4189
  2390
  P(t_case f1 ... fn x) =
oheimb@4189
  2391
    ~( (? y1 ... ym1. x = C1 y1 ... ym1 & ~P(f1 y1 ... ym1)) |
oheimb@4189
  2392
        ...
oheimb@4189
  2393
       (? y1 ... ymn. x = Cn y1 ... ymn & ~P(f1 y1 ... ymn))
oheimb@4189
  2394
     )
oheimb@4930
  2395
  which can be added to a simpset via `addsplits'. The existing theorems
oheimb@4930
  2396
  expand_list_case and expand_option_case have been renamed to
oheimb@4930
  2397
  split_list_case and split_option_case.
oheimb@4189
  2398
nipkow@4361
  2399
* HOL/Arithmetic:
nipkow@4361
  2400
  - `pred n' is automatically converted to `n-1'.
nipkow@4361
  2401
    Users are strongly encouraged not to use `pred' any longer,
nipkow@4361
  2402
    because it will disappear altogether at some point.
nipkow@4361
  2403
  - Users are strongly encouraged to write "0 < n" rather than
nipkow@4361
  2404
    "n ~= 0". Theorems and proof tools have been modified towards this
nipkow@4361
  2405
    `standard'.
nipkow@4357
  2406
nipkow@4502
  2407
* HOL/Lists:
nipkow@4502
  2408
  the function "set_of_list" has been renamed "set" (and its theorems too);
nipkow@4502
  2409
  the function "nth" now takes its arguments in the reverse order and
nipkow@4502
  2410
  has acquired the infix notation "!" as in "xs!n".
paulson@3570
  2411
paulson@4154
  2412
* HOL/Set: UNIV is now a constant and is no longer translated to Compl{};
paulson@4154
  2413
paulson@4154
  2414
* HOL/Set: The operator (UN x.B x) now abbreviates (UN x:UNIV. B x) and its
paulson@4154
  2415
  specialist theorems (like UN1_I) are gone.  Similarly for (INT x.B x);
paulson@4154
  2416
wenzelm@4575
  2417
* HOL/record: extensible records with schematic structural subtyping
wenzelm@4575
  2418
(single inheritance); EXPERIMENTAL version demonstrating the encoding,
wenzelm@4575
  2419
still lacks various theorems and concrete record syntax;
wenzelm@4575
  2420
wenzelm@4125
  2421
paulson@3715
  2422
*** HOLCF ***
wenzelm@3535
  2423
wenzelm@4125
  2424
* removed "axioms" and "generated by" sections;
wenzelm@4125
  2425
oheimb@4123
  2426
* replaced "ops" section by extended "consts" section, which is capable of
wenzelm@4125
  2427
  handling the continuous function space "->" directly;
wenzelm@4125
  2428
wenzelm@4125
  2429
* domain package:
wenzelm@4125
  2430
  . proves theorems immediately and stores them in the theory,
wenzelm@4125
  2431
  . creates hierachical name space,
wenzelm@4125
  2432
  . now uses normal mixfix annotations (instead of cinfix...),
wenzelm@4125
  2433
  . minor changes to some names and values (for consistency),
wenzelm@4125
  2434
  . e.g. cases -> casedist, dists_eq -> dist_eqs, [take_lemma] -> take_lemmas,
wenzelm@4125
  2435
  . separator between mutual domain defs: changed "," to "and",
wenzelm@4125
  2436
  . improved handling of sort constraints;  now they have to
wenzelm@4125
  2437
    appear on the left-hand side of the equations only;
oheimb@4123
  2438
oheimb@4123
  2439
* fixed LAM <x,y,zs>.b syntax;
wenzelm@3567
  2440
wenzelm@3744
  2441
* added extended adm_tac to simplifier in HOLCF -- can now discharge
wenzelm@3744
  2442
adm (%x. P (t x)), where P is chainfinite and t continuous;
wenzelm@3579
  2443
wenzelm@3579
  2444
paulson@3719
  2445
*** FOL and ZF ***
paulson@3719
  2446
wenzelm@5726
  2447
* FOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  2448
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
  2449
wenzelm@3744
  2450
* qed_spec_mp, qed_goal_spec_mp, qed_goalw_spec_mp are available, as
wenzelm@3744
  2451
in HOL, they strip ALL and --> from proved theorems;
wenzelm@3744
  2452
paulson@3719
  2453
wenzelm@3579
  2454
wenzelm@3006
  2455
New in Isabelle94-8 (May 1997)
wenzelm@3006
  2456
------------------------------
wenzelm@2654
  2457
paulson@3002
  2458
*** General Changes ***
paulson@3002
  2459
paulson@3002
  2460
* new utilities to build / run / maintain Isabelle etc. (in parts
paulson@3002
  2461
still somewhat experimental); old Makefiles etc. still functional;
wenzelm@2971
  2462
wenzelm@3205
  2463
* new 'Isabelle System Manual';
wenzelm@3205
  2464
wenzelm@2825
  2465
* INSTALL text, together with ./configure and ./build scripts;
wenzelm@2773
  2466
wenzelm@3006
  2467
* reimplemented type inference for greater efficiency, better error
wenzelm@3006
  2468
messages and clean internal interface;
paulson@3002
  2469
paulson@3002
  2470
* prlim command for dealing with lots of subgoals (an easier way of
paulson@3002
  2471
setting goals_limit);
paulson@3002
  2472
wenzelm@3006
  2473
wenzelm@3006
  2474
*** Syntax ***
paulson@3002
  2475
wenzelm@3116
  2476
* supports alternative (named) syntax tables (parser and pretty
wenzelm@3116
  2477
printer); internal interface is provided by add_modesyntax(_i);
wenzelm@3116
  2478
paulson@3002
  2479
* Pure, FOL, ZF, HOL, HOLCF now support symbolic input and output; to
paulson@3002
  2480
be used in conjunction with the Isabelle symbol font; uses the
paulson@3002
  2481
"symbols" syntax table;
paulson@3002
  2482
wenzelm@2705
  2483
* added token_translation interface (may translate name tokens in
wenzelm@2756
  2484
arbitrary ways, dependent on their type (free, bound, tfree, ...) and
wenzelm@3116
  2485
the current print_mode); IMPORTANT: user print translation functions
wenzelm@3116
  2486
are responsible for marking newly introduced bounds
wenzelm@3116
  2487
(Syntax.mark_boundT);
wenzelm@2705
  2488
wenzelm@2730
  2489
* token translations for modes "xterm" and "xterm_color" that display
wenzelm@3006
  2490
names in bold, underline etc. or colors (which requires a color
wenzelm@3006
  2491
version of xterm);
wenzelm@2730
  2492
paulson@3002
  2493
* infixes may now be declared with names independent of their syntax;
paulson@3002
  2494
paulson@3002
  2495
* added typed_print_translation (like print_translation, but may
paulson@3002
  2496
access type of constant);
paulson@3002
  2497
wenzelm@3006
  2498
paulson@3002
  2499
*** Classical Reasoner ***
paulson@3002
  2500
paulson@3002
  2501
Blast_tac: a new tactic!  It is often more powerful than fast_tac, but has
paulson@3002
  2502
some limitations.  Blast_tac...
paulson@3002
  2503
  + ignores addss, addbefore, addafter; this restriction is intrinsic
paulson@3002
  2504
  + ignores elimination rules that don't have the correct format
wenzelm@5726
  2505
        (the conclusion MUST be a formula variable)
paulson@3002
  2506
  + ignores types, which can make HOL proofs fail
paulson@3002
  2507
  + rules must not require higher-order unification, e.g. apply_type in ZF
paulson@3002
  2508
    [message "Function Var's argument not a bound variable" relates to this]
paulson@3002
  2509
  + its proof strategy is more general but can actually be slower
paulson@3002
  2510
wenzelm@3107
  2511
* substitution with equality assumptions no longer permutes other
wenzelm@3107
  2512
assumptions;
paulson@3002
  2513
paulson@3002
  2514
* minor changes in semantics of addafter (now called addaltern); renamed
paulson@3002
  2515
setwrapper to setWrapper and compwrapper to compWrapper; added safe wrapper
wenzelm@3107
  2516
(and access functions for it);
paulson@3002
  2517
wenzelm@5726
  2518
* improved combination of classical reasoner and simplifier:
oheimb@3317
  2519
  + functions for handling clasimpsets
oheimb@3317
  2520
  + improvement of addss: now the simplifier is called _after_ the
oheimb@3317
  2521
    safe steps.
oheimb@3317
  2522
  + safe variant of addss called addSss: uses safe simplifications
wenzelm@5726
  2523
    _during_ the safe steps. It is more complete as it allows multiple
oheimb@3317
  2524
    instantiations of unknowns (e.g. with slow_tac).
wenzelm@3006
  2525
paulson@3002
  2526
*** Simplifier ***
paulson@3002
  2527
wenzelm@3006
  2528
* added interface for simplification procedures (functions that
wenzelm@3006
  2529
produce *proven* rewrite rules on the fly, depending on current
wenzelm@3006
  2530
redex);
wenzelm@3006
  2531
wenzelm@3006
  2532
* ordering on terms as parameter (used for ordered rewriting);
wenzelm@3006
  2533
wenzelm@3107
  2534
* new functions delcongs, deleqcongs, and Delcongs. richer rep_ss;
paulson@3002
  2535
paulson@3002
  2536
* the solver is now split into a safe and an unsafe part.
paulson@3002
  2537
This should be invisible for the normal user, except that the
paulson@3002
  2538
functions setsolver and addsolver have been renamed to setSolver and
wenzelm@3107
  2539
addSolver; added safe_asm_full_simp_tac;
paulson@3002
  2540
paulson@3002
  2541
paulson@3002
  2542
*** HOL ***
paulson@3002
  2543
nipkow@3042
  2544
* a generic induction tactic `induct_tac' which works for all datatypes and
wenzelm@3107
  2545
also for type `nat';
nipkow@3042
  2546
nipkow@3316
  2547
* a generic case distinction tactic `exhaust_tac' which works for all
nipkow@3316
  2548
datatypes and also for type `nat';
nipkow@3316
  2549
nipkow@3316
  2550
* each datatype comes with a function `size';
nipkow@3316
  2551
paulson@3002
  2552
* patterns in case expressions allow tuple patterns as arguments to
wenzelm@3107
  2553
constructors, for example `case x of [] => ... | (x,y,z)#ps => ...';
paulson@3002
  2554
paulson@3002
  2555
* primrec now also works with type nat;
paulson@3002
  2556
paulson@3338
  2557
* recdef: a new declaration form, allows general recursive functions to be
paulson@3338
  2558
defined in theory files.  See HOL/ex/Fib, HOL/ex/Primes, HOL/Subst/Unify.
paulson@3338
  2559
paulson@3002
  2560
* the constant for negation has been renamed from "not" to "Not" to
wenzelm@3107
  2561
harmonize with FOL, ZF, LK, etc.;
paulson@3002
  2562
wenzelm@3107
  2563
* HOL/ex/LFilter theory of a corecursive "filter" functional for
wenzelm@3107
  2564
infinite lists;
paulson@3002
  2565
wenzelm@3227
  2566
* HOL/Modelcheck demonstrates invocation of model checker oracle;
wenzelm@3227
  2567
paulson@3002
  2568
* HOL/ex/Ring.thy declares cring_simp, which solves equational
paulson@3002
  2569
problems in commutative rings, using axiomatic type classes for + and *;
paulson@3002
  2570
paulson@3002
  2571
* more examples in HOL/MiniML and HOL/Auth;
paulson@3002
  2572
paulson@3002
  2573
* more default rewrite rules for quantifiers, union/intersection;
paulson@3002
  2574
nipkow@3321
  2575
* a new constant `arbitrary == @x.False';
nipkow@3321
  2576
wenzelm@3107
  2577
* HOLCF/IOA replaces old HOL/IOA;
wenzelm@3107
  2578
wenzelm@5726
  2579
* HOLCF changes: derived all rules and arities
wenzelm@5726
  2580
  + axiomatic type classes instead of classes
slotosch@2653
  2581
  + typedef instead of faking type definitions
paulson@2747
  2582
  + eliminated the internal constants less_fun, less_cfun, UU_fun, UU_cfun etc.
wenzelm@2730
  2583
  + new axclasses cpo, chfin, flat with flat < chfin < pcpo < cpo < po
slotosch@2653
  2584
  + eliminated the types void, one, tr
slotosch@2653
  2585
  + use unit lift and bool lift (with translations) instead of one and tr
slotosch@2653
  2586
  + eliminated blift from Lift3.thy (use Def instead of blift)
wenzelm@3107
  2587
  all eliminated rules are derived as theorems --> no visible changes ;
oheimb@2649
  2588
wenzelm@3006
  2589
paulson@3002
  2590
*** ZF ***
wenzelm@2553
  2591
paulson@2865
  2592
* ZF now has Fast_tac, Simp_tac and Auto_tac.  Union_iff is a now a default
paulson@2865
  2593
rewrite rule; this may affect some proofs.  eq_cs is gone but can be put back
paulson@2865
  2594
as ZF_cs addSIs [equalityI];
wenzelm@2553
  2595
wenzelm@2554
  2596
wenzelm@2732
  2597
wenzelm@2553
  2598
New in Isabelle94-7 (November 96)
wenzelm@2553
  2599
---------------------------------
wenzelm@2553
  2600
wenzelm@2553
  2601
* allowing negative levels (as offsets) in prlev and choplev;
wenzelm@2553
  2602
wenzelm@2554
  2603
* super-linear speedup for large simplifications;
wenzelm@2554
  2604
wenzelm@2554
  2605
* FOL, ZF and HOL now use miniscoping: rewriting pushes
wenzelm@2554
  2606
quantifications in as far as possible (COULD MAKE EXISTING PROOFS
wenzelm@2554
  2607
FAIL); can suppress it using the command Delsimps (ex_simps @
wenzelm@2554
  2608
all_simps); De Morgan laws are also now included, by default;
wenzelm@2554
  2609
wenzelm@2554
  2610
* improved printing of ==>  :  ~:
wenzelm@2554
  2611
wenzelm@2554
  2612
* new object-logic "Sequents" adds linear logic, while replacing LK
wenzelm@2554
  2613
and Modal (thanks to Sara Kalvala);
wenzelm@2554
  2614
wenzelm@2554
  2615
* HOL/Auth: correctness proofs for authentication protocols;
wenzelm@2554
  2616
wenzelm@2554
  2617
* HOL: new auto_tac combines rewriting and classical reasoning (many
wenzelm@2554
  2618
examples on HOL/Auth);
wenzelm@2554
  2619
wenzelm@2554
  2620
* HOL: new command AddIffs for declaring theorems of the form P=Q to
wenzelm@2554
  2621
the rewriter and classical reasoner simultaneously;
wenzelm@2554
  2622
wenzelm@2554
  2623
* function uresult no longer returns theorems in "standard" format;
wenzelm@2554
  2624
regain previous version by: val uresult = standard o uresult;
wenzelm@2554
  2625
wenzelm@2554
  2626
wenzelm@2554
  2627
wenzelm@2554
  2628
New in Isabelle94-6
wenzelm@2554
  2629
-------------------
wenzelm@2554
  2630
wenzelm@2554
  2631
* oracles -- these establish an interface between Isabelle and trusted
wenzelm@2554
  2632
external reasoners, which may deliver results as theorems;
wenzelm@2554
  2633
wenzelm@2554
  2634
* proof objects (in particular record all uses of oracles);
wenzelm@2554
  2635
wenzelm@2554
  2636
* Simp_tac, Fast_tac, etc. that refer to implicit simpset / claset;
wenzelm@2554
  2637
wenzelm@2554
  2638
* "constdefs" section in theory files;
wenzelm@2554
  2639
wenzelm@2554
  2640
* "primrec" section (HOL) no longer requires names;
wenzelm@2554
  2641
wenzelm@2554
  2642
* internal type "tactic" now simply "thm -> thm Sequence.seq";
wenzelm@2554
  2643
wenzelm@2554
  2644
wenzelm@2554
  2645
wenzelm@2554
  2646
New in Isabelle94-5
wenzelm@2554
  2647
-------------------
wenzelm@2554
  2648