NEWS
author nipkow
Wed Nov 24 08:43:41 2004 +0100 (2004-11-24)
changeset 15319 b8da286bb9ad
parent 15287 55b7f7920622
child 15350 53d2927d9680
permissions -rw-r--r--
*** empty log message ***
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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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* isatool usedir: new option -f that allows specification of the ML
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  file to be used by Isabelle; default is ROOT.ML.
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* Theory headers: the new header syntax for Isar theories is
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  theory <name>
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  imports <theory1> ... <theoryn>
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  begin
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  optionally also with a "files" section. The syntax
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  theory <name> = <theory1> + ... + <theoryn>:
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  will still be supported for some time but will eventually disappear.
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  The syntax of old-style theories has not changed.
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* Provers/quasi.ML:  new transitivity reasoners for transitivity only
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  and quasi orders.
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* Provers/trancl.ML:  new transitivity reasoner for transitive and
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  reflexive-transitive closure of relations.
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* Provers/blast.ML:  new reference depth_limit to make blast's depth
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  limit (previously hard-coded with a value of 20) user-definable.
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* 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: print_tac now outputs the goal through the trace channel.
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* Pure: reference Namespace.unique_names included.  If true the
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  (shortest) namespace-prefix is printed to disambiguate conflicts (as
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  yet). If false the first entry wins (as during parsing). Default
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  value is true.
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* Pure: tuned internal renaming of symbolic identifiers -- attach
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  primes instead of base 26 numbers.
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* Pure/Syntax: inner syntax includes (*(*nested*) comments*).
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* Pure/Syntax: pretty pinter now supports unbreakable blocks,
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  specified in mixfix annotations as "(00...)".
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* Pure/Syntax: 'advanced' translation functions (parse_translation
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  etc.) may depend on the signature of the theory context being
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  presently used for parsing/printing, see also isar-ref manual.
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* Pure/Simplifier: simplification procedures may now take the current
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  simpset into account (cf. Simplifier.simproc(_i) / mk_simproc
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  interface), which is very useful for calling the Simplifier
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  recursively.  Minor INCOMPATIBILITY: the 'prems' argument of
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  simprocs is gone -- use prems_of_ss on the simpset instead.
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  Moreover, the low-level mk_simproc no longer applies Logic.varify
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  internally, to allow for use in a context of fixed variables.
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* Provers: Simplifier and Classical Reasoner now support proof context
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  dependent plug-ins (simprocs, solvers, wrappers etc.).  These extra
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  components are stored in the theory and patched into the
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  simpset/claset when used in an Isar proof context.  Context
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  dependent components are maintained by the following theory
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  operations:
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    Simplifier.add_context_simprocs
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    Simplifier.del_context_simprocs
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    Simplifier.set_context_subgoaler
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    Simplifier.reset_context_subgoaler
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    Simplifier.add_context_looper
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    Simplifier.del_context_looper
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    Simplifier.add_context_unsafe_solver
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    Simplifier.add_context_safe_solver
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    Classical.add_context_safe_wrapper
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    Classical.del_context_safe_wrapper
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    Classical.add_context_unsafe_wrapper
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    Classical.del_context_unsafe_wrapper
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  IMPORTANT NOTE: proof tools (methods etc.) need to use
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  local_simpset_of and local_claset_of to instead of the primitive
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  Simplifier.get_local_simpset and Classical.get_local_claset,
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  respectively, in order to see the context dependent fields!
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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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*** Isar ***
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* Locales:
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  - "includes" disallowed in declaration of named locales (command "locale").
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  - Fixed parameter management in theorem generation for goals with "includes".
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    INCOMPATIBILITY: rarely, the generated theorem statement is different.
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*** HOL ***
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* Datatype induction via method `induct' now preserves the name of the
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  induction variable. For example, when proving P(xs::'a list) by induction
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  on xs, the induction step is now P(xs) ==> P(a#xs) rather than
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  P(list) ==> P(a#list) as previously.
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* HOL/record: reimplementation of records. Improved scalability for
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  records with many fields, avoiding performance problems for type
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  inference. Records are no longer composed of nested field types, but
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  of nested extension types. Therefore the record type only grows
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  linear in the number of extensions and not in the number of fields.
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  The top-level (users) view on records is preserved.  Potential
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  INCOMPATIBILITY only in strange cases, where the theory depends on
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  the old record representation. The type generated for a record is
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  called <record_name>_ext_type.
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* HOL/record: Reference record_quick_and_dirty_sensitive can be
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  enabled to skip the proofs triggered by a record definition or a
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  simproc (if quick_and_dirty is enabled). Definitions of large
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  records can take quite long.
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* HOL/record: "record_upd_simproc" for simplification of multiple
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  record updates enabled by default.  Moreover, trivial updates are
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  also removed: r(|x := x r|) = r.  INCOMPATIBILITY: old proofs break
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  occasionally, since simplification is more powerful by default.
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* HOL: symbolic syntax of Hilbert Choice Operator is now as follows:
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  syntax (epsilon)
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    "_Eps" :: "[pttrn, bool] => 'a"    ("(3\<some>_./ _)" [0, 10] 10)
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  The symbol \<some> is displayed as the alternative epsilon of LaTeX
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  and x-symbol; use option '-m epsilon' to get it actually printed.
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  Moreover, the mathematically important symbolic identifier
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  \<epsilon> becomes available as variable, constant etc.
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* HOL/SetInterval: The syntax for open intervals has changed:
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  Old         New
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  {..n(}   -> {..<n}
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  {)n..}   -> {n<..}
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  {m..n(}  -> {m..<n}
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  {)m..n}  -> {m<..n}
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  {)m..n(} -> {m<..<n}
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  The old syntax is still supported but will disappear in the future.
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  For conversion use the following emacs search and replace patterns:
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  {)\([^\.]*\)\.\.  ->  {\1<\.\.}
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  \.\.\([^(}]*\)(}  ->  \.\.<\1}
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  They are not perfect but work quite well.
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* HOL: The syntax for 'setsum', summation over finite sets, has changed:
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  The syntax for 'setsum (%x. e) A' used to be '\<Sum>x:A. e'
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  and is now either 'SUM x:A. e' or '\<Sum>x\<in>A. e'.
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  There is new syntax for summation over finite sets:
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  '\<Sum>x | P. e'    is the same as  'setsum (%x. e) {x. P}'
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  '\<Sum>x=a..b. e'   is the same as  'setsum (%x. e) {a..b}'
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  '\<Sum>x=a..<b. e'  is the same as  'setsum (%x. e) {a..<b}'
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  '\<Sum>x<k. e'      is the same as  'setsum (%x. e) {..<k}'
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  Function 'Summation' over nat is gone, its syntax '\<Sum>i<k. e'
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  now translates into 'setsum' as above.
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* HOL: Finite set induction: In Isar proofs, the insert case is now
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  "case (insert x F)" instead of the old counterintuitive "case (insert F x)".
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* HOL/Simplifier:
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  - Is now set up to reason about transitivity chains involving "trancl"
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  (r^+) and "rtrancl" (r^*) by setting up tactics provided by
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  Provers/trancl.ML as additional solvers.  INCOMPATIBILITY: old proofs break
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  occasionally as simplification may now solve more goals than previously.
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  - Converts x <= y into x = y if assumption y <= x is present.  Works for
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  all partial orders (class "order"), in particular numbers and sets. For
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  linear orders (e.g. numbers) it treats ~ x < y just like y <= x.
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* HOL: new 'isatool dimacs2hol' to convert files in DIMACS CNF format
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  (containing Boolean satisfiability problems) into Isabelle/HOL theories.
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*** HOLCF ***
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* HOLCF: discontinued special version of 'constdefs' (which used to
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  support continuous functions) in favor of the general Pure one with
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  full type-inference.
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*** ZF ***
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* ZF/ex/{Group,Ring}: examples in abstract algebra, including the
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  First Isomorphism Theorem (on quotienting by the kernel of a
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  homomorphism).
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* ZF/Simplifier: install second copy of type solver that actually
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  makes use of TC rules declared to Isar proof contexts (or locales);
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  the old version is still required for ML proof scripts.
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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:
ballarin@14211
   333
  - Goal statements involving the context element "includes" no longer
ballarin@14211
   334
    generate theorems with internal delta predicates (those ending on
ballarin@14211
   335
    "_axioms") in the premise.
ballarin@14211
   336
    Resolve particular premise with <locale>.intro to obtain old form.
ballarin@14211
   337
  - Fixed bug in type inference ("unify_frozen") that prevented mix of target
ballarin@14211
   338
    specification and "includes" elements in goal statement.
ballarin@14254
   339
  - Rule sets <locale>.intro and <locale>.axioms no longer declared as
ballarin@14254
   340
    [intro?] and [elim?] (respectively) by default.
ballarin@14508
   341
  - Experimental command for instantiation of locales in proof contexts:
ballarin@14551
   342
        instantiate <label>[<attrs>]: <loc>
ballarin@14508
   343
    Instantiates locale <loc> and adds all its theorems to the current context
ballarin@14551
   344
    taking into account their attributes.  Label and attrs are optional
ballarin@14551
   345
    modifiers, like in theorem declarations.  If present, names of
ballarin@14551
   346
    instantiated theorems are qualified with <label>, and the attributes
ballarin@14551
   347
    <attrs> are applied after any attributes these theorems might have already.
ballarin@14551
   348
      If the locale has assumptions, a chained fact of the form
ballarin@14508
   349
    "<loc> t1 ... tn" is expected from which instantiations of the parameters
ballarin@14551
   350
    are derived.  The command does not support old-style locales declared
ballarin@14551
   351
    with "locale (open)".
ballarin@14551
   352
      A few (very simple) examples can be found in FOL/ex/LocaleInst.thy.
ballarin@14175
   353
ballarin@14175
   354
* HOL: Tactic emulation methods induct_tac and case_tac understand static
ballarin@14175
   355
  (Isar) contexts.
ballarin@14175
   356
wenzelm@14556
   357
kleing@14136
   358
*** HOL ***
kleing@14136
   359
kleing@14624
   360
* Proof import: new image HOL4 contains the imported library from
kleing@14624
   361
  the HOL4 system with about 2500 theorems. It is imported by
kleing@14624
   362
  replaying proof terms produced by HOL4 in Isabelle. The HOL4 image
kleing@14624
   363
  can be used like any other Isabelle image.  See
kleing@14624
   364
  HOL/Import/HOL/README for more information.
kleing@14624
   365
ballarin@14398
   366
* Simplifier:
ballarin@14398
   367
  - Much improved handling of linear and partial orders.
ballarin@14398
   368
    Reasoners for linear and partial orders are set up for type classes
ballarin@14398
   369
    "linorder" and "order" respectively, and are added to the default simpset
ballarin@14398
   370
    as solvers.  This means that the simplifier can build transitivity chains
ballarin@14398
   371
    to solve goals from the assumptions.
ballarin@14398
   372
  - INCOMPATIBILITY: old proofs break occasionally.  Typically, applications
ballarin@14398
   373
    of blast or auto after simplification become unnecessary because the goal
ballarin@14398
   374
    is solved by simplification already.
ballarin@14398
   375
wenzelm@14731
   376
* Numerics: new theory Ring_and_Field contains over 250 basic numerical laws,
paulson@14389
   377
    all proved in axiomatic type classes for semirings, rings and fields.
paulson@14389
   378
paulson@14389
   379
* Numerics:
paulson@14389
   380
  - Numeric types (nat, int, and in HOL-Complex rat, real, complex, etc.) are
wenzelm@14731
   381
    now formalized using the Ring_and_Field theory mentioned above.
paulson@14389
   382
  - INCOMPATIBILITY: simplification and arithmetic behaves somewhat differently
paulson@14389
   383
    than before, because now they are set up once in a generic manner.
wenzelm@14731
   384
  - INCOMPATIBILITY: many type-specific arithmetic laws have gone.
paulson@14480
   385
    Look for the general versions in Ring_and_Field (and Power if they concern
paulson@14480
   386
    exponentiation).
paulson@14389
   387
paulson@14401
   388
* Type "rat" of the rational numbers is now available in HOL-Complex.
paulson@14389
   389
schirmer@14255
   390
* Records:
schirmer@14255
   391
  - Record types are now by default printed with their type abbreviation
schirmer@14255
   392
    instead of the list of all field types. This can be configured via
schirmer@14255
   393
    the reference "print_record_type_abbr".
wenzelm@14731
   394
  - Simproc "record_upd_simproc" for simplification of multiple updates added
schirmer@14255
   395
    (not enabled by default).
schirmer@14427
   396
  - Simproc "record_ex_sel_eq_simproc" to simplify EX x. sel r = x resp.
schirmer@14427
   397
    EX x. x = sel r to True (not enabled by default).
schirmer@14255
   398
  - Tactic "record_split_simp_tac" to split and simplify records added.
wenzelm@14731
   399
kleing@14136
   400
* 'specification' command added, allowing for definition by
skalberg@14224
   401
  specification.  There is also an 'ax_specification' command that
skalberg@14224
   402
  introduces the new constants axiomatically.
kleing@14136
   403
nipkow@14375
   404
* arith(_tac) is now able to generate counterexamples for reals as well.
nipkow@14375
   405
ballarin@14399
   406
* HOL-Algebra: new locale "ring" for non-commutative rings.
ballarin@14399
   407
paulson@14243
   408
* HOL-ex: InductiveInvariant_examples illustrates advanced recursive function
kleing@14610
   409
  definitions, thanks to Sava Krsti\'{c} and John Matthews.
kleing@14610
   410
wenzelm@14731
   411
* HOL-Matrix: a first theory for matrices in HOL with an application of
kleing@14610
   412
  matrix theory to linear programming.
kleing@14136
   413
nipkow@14380
   414
* Unions and Intersections:
nipkow@15119
   415
  The latex output syntax of UN and INT has been changed
nipkow@15119
   416
  from "\Union x \in A. B" to "\Union_{x \in A} B"
nipkow@15119
   417
  i.e. the index formulae has become a subscript.
nipkow@15119
   418
  Similarly for "\Union x. B", and for \Inter instead of \Union.
nipkow@14380
   419
kleing@14418
   420
* Unions and Intersections over Intervals:
wenzelm@14731
   421
  There is new short syntax "UN i<=n. A" for "UN i:{0..n}. A". There is
wenzelm@14731
   422
  also an x-symbol version with subscripts "\<Union>\<^bsub>i <= n\<^esub>. A"
kleing@14418
   423
  like in normal math, and corresponding versions for < and for intersection.
kleing@14418
   424
paulson@14401
   425
* ML: the legacy theory structures Int and List have been removed. They had
paulson@14401
   426
  conflicted with ML Basis Library structures having the same names.
nipkow@14380
   427
webertj@14464
   428
* 'refute' command added to search for (finite) countermodels.  Only works
webertj@14464
   429
  for a fragment of HOL.  The installation of an external SAT solver is
webertj@14464
   430
  highly recommended.  See "HOL/Refute.thy" for details.
webertj@14464
   431
berghofe@14602
   432
* 'quickcheck' command: Allows to find counterexamples by evaluating
berghofe@14602
   433
  formulae under an assignment of free variables to random values.
berghofe@14602
   434
  In contrast to 'refute', it can deal with inductive datatypes,
berghofe@14602
   435
  but cannot handle quantifiers. See "HOL/ex/Quickcheck_Examples.thy"
berghofe@14602
   436
  for examples.
webertj@14464
   437
wenzelm@14606
   438
oheimb@14536
   439
*** HOLCF ***
oheimb@14536
   440
oheimb@14536
   441
* Streams now come with concatenation and are part of the HOLCF image
oheimb@14536
   442
wenzelm@14572
   443
wenzelm@14572
   444
kleing@14136
   445
New in Isabelle2003 (May 2003)
wenzelm@14606
   446
------------------------------
kleing@14136
   447
wenzelm@13280
   448
*** General ***
wenzelm@13280
   449
berghofe@13618
   450
* Provers/simplifier:
berghofe@13618
   451
nipkow@13781
   452
  - Completely reimplemented method simp (ML: Asm_full_simp_tac):
berghofe@13618
   453
    Assumptions are now subject to complete mutual simplification,
berghofe@13618
   454
    not just from left to right. The simplifier now preserves
berghofe@13618
   455
    the order of assumptions.
berghofe@13618
   456
berghofe@13618
   457
    Potential INCOMPATIBILITY:
berghofe@13618
   458
nipkow@13781
   459
    -- simp sometimes diverges where the old version did
nipkow@13781
   460
       not, e.g. invoking simp on the goal
berghofe@13618
   461
berghofe@13618
   462
        [| P (f x); y = x; f x = f y |] ==> Q
berghofe@13618
   463
nipkow@13781
   464
       now gives rise to the infinite reduction sequence
nipkow@13781
   465
nipkow@13781
   466
        P(f x) --(f x = f y)--> P(f y) --(y = x)--> P(f x) --(f x = f y)--> ...
nipkow@13781
   467
nipkow@13781
   468
       Using "simp (asm_lr)" (ML: Asm_lr_simp_tac) instead often solves this
nipkow@13781
   469
       kind of problem.
nipkow@13781
   470
nipkow@13781
   471
    -- Tactics combining classical reasoner and simplification (such as auto)
nipkow@13781
   472
       are also affected by this change, because many of them rely on
nipkow@13781
   473
       simp. They may sometimes diverge as well or yield a different numbers
nipkow@13781
   474
       of subgoals. Try to use e.g. force, fastsimp, or safe instead of auto
nipkow@13781
   475
       in case of problems. Sometimes subsequent calls to the classical
nipkow@13781
   476
       reasoner will fail because a preceeding call to the simplifier too
nipkow@13781
   477
       eagerly simplified the goal, e.g. deleted redundant premises.
berghofe@13618
   478
berghofe@13618
   479
  - The simplifier trace now shows the names of the applied rewrite rules
berghofe@13618
   480
nipkow@13829
   481
  - You can limit the number of recursive invocations of the simplifier
nipkow@13829
   482
    during conditional rewriting (where the simplifie tries to solve the
nipkow@13829
   483
    conditions before applying the rewrite rule):
nipkow@13829
   484
    ML "simp_depth_limit := n"
nipkow@13829
   485
    where n is an integer. Thus you can force termination where previously
nipkow@13829
   486
    the simplifier would diverge.
nipkow@13829
   487
ballarin@13835
   488
  - Accepts free variables as head terms in congruence rules.  Useful in Isar.
nipkow@13829
   489
ballarin@13938
   490
  - No longer aborts on failed congruence proof.  Instead, the
ballarin@13938
   491
    congruence is ignored.
ballarin@13938
   492
berghofe@14008
   493
* Pure: New generic framework for extracting programs from constructive
berghofe@14008
   494
  proofs. See HOL/Extraction.thy for an example instantiation, as well
berghofe@14008
   495
  as HOL/Extraction for some case studies.
berghofe@14008
   496
nipkow@13868
   497
* Pure: The main goal of the proof state is no longer shown by default, only
nipkow@13868
   498
the subgoals. This behaviour is controlled by a new flag.
ballarin@13835
   499
   PG menu: Isabelle/Isar -> Settings -> Show Main Goal
nipkow@13815
   500
(ML: Proof.show_main_goal).
nipkow@13815
   501
nipkow@13815
   502
* Pure: You can find all matching introduction rules for subgoal 1, i.e. all
nipkow@13815
   503
rules whose conclusion matches subgoal 1:
nipkow@13815
   504
      PG menu: Isabelle/Isar -> Show me -> matching rules
nipkow@13815
   505
The rules are ordered by how closely they match the subgoal.
nipkow@13815
   506
In particular, rules that solve a subgoal outright are displayed first
nipkow@13815
   507
(or rather last, the way they are printed).
nipkow@13815
   508
(ML: ProofGeneral.print_intros())
nipkow@13815
   509
nipkow@13815
   510
* Pure: New flag trace_unify_fail causes unification to print
nipkow@13781
   511
diagnostic information (PG: in trace buffer) when it fails. This is
nipkow@13781
   512
useful for figuring out why single step proofs like rule, erule or
nipkow@13781
   513
assumption failed.
nipkow@13781
   514
nipkow@13815
   515
* Pure: Locale specifications now produce predicate definitions
wenzelm@13410
   516
according to the body of text (covering assumptions modulo local
wenzelm@13410
   517
definitions); predicate "loc_axioms" covers newly introduced text,
wenzelm@13410
   518
while "loc" is cumulative wrt. all included locale expressions; the
wenzelm@13410
   519
latter view is presented only on export into the global theory
wenzelm@13410
   520
context; potential INCOMPATIBILITY, use "(open)" option to fall back
wenzelm@13410
   521
on the old view without predicates;
wenzelm@13410
   522
wenzelm@13459
   523
* Pure: predefined locales "var" and "struct" are useful for sharing
wenzelm@13459
   524
parameters (as in CASL, for example); just specify something like
wenzelm@13459
   525
``var x + var y + struct M'' as import;
wenzelm@13459
   526
wenzelm@13463
   527
* Pure: improved thms_containing: proper indexing of facts instead of
wenzelm@13463
   528
raw theorems; check validity of results wrt. current name space;
wenzelm@13463
   529
include local facts of proof configuration (also covers active
wenzelm@13541
   530
locales), cover fixed variables in index; may use "_" in term
wenzelm@13541
   531
specification; an optional limit for the number of printed facts may
wenzelm@13541
   532
be given (the default is 40);
wenzelm@13541
   533
wenzelm@13541
   534
* Pure: disallow duplicate fact bindings within new-style theory files
wenzelm@13541
   535
(batch-mode only);
wenzelm@13540
   536
wenzelm@13463
   537
* Provers: improved induct method: assumptions introduced by case
wenzelm@13463
   538
"foo" are split into "foo.hyps" (from the rule) and "foo.prems" (from
wenzelm@13463
   539
the goal statement); "foo" still refers to all facts collectively;
wenzelm@13463
   540
paulson@13550
   541
* Provers: the function blast.overloaded has been removed: all constants
paulson@13550
   542
are regarded as potentially overloaded, which improves robustness in exchange
paulson@13550
   543
for slight decrease in efficiency;
paulson@13550
   544
nipkow@13781
   545
* Provers/linorder: New generic prover for transitivity reasoning over
nipkow@13781
   546
linear orders.  Note: this prover is not efficient!
nipkow@13781
   547
wenzelm@13522
   548
* Isar: preview of problems to finish 'show' now produce an error
wenzelm@13522
   549
rather than just a warning (in interactive mode);
wenzelm@13522
   550
wenzelm@13280
   551
nipkow@13158
   552
*** HOL ***
nipkow@13158
   553
nipkow@13899
   554
* arith(_tac)
nipkow@13899
   555
nipkow@13899
   556
 - Produces a counter example if it cannot prove a goal.
nipkow@13899
   557
   Note that the counter example may be spurious if the goal is not a formula
nipkow@13899
   558
   of quantifier-free linear arithmetic.
nipkow@13899
   559
   In ProofGeneral the counter example appears in the trace buffer.
nipkow@13899
   560
nipkow@13899
   561
 - Knows about div k and mod k where k is a numeral of type nat or int.
nipkow@13899
   562
nipkow@13899
   563
 - Calls full Presburger arithmetic (by Amine Chaieb) if quantifier-free
nipkow@13899
   564
   linear arithmetic fails. This takes account of quantifiers and divisibility.
wenzelm@14731
   565
   Presburger arithmetic can also be called explicitly via presburger(_tac).
nipkow@13899
   566
nipkow@13899
   567
* simp's arithmetic capabilities have been enhanced a bit: it now
nipkow@13899
   568
takes ~= in premises into account (by performing a case split);
nipkow@13899
   569
nipkow@13899
   570
* simp reduces "m*(n div m) + n mod m" to n, even if the two summands
nipkow@13899
   571
are distributed over a sum of terms;
nipkow@13899
   572
ballarin@13735
   573
* New tactic "trans_tac" and method "trans" instantiate
ballarin@13735
   574
Provers/linorder.ML for axclasses "order" and "linorder" (predicates
wenzelm@14731
   575
"<=", "<" and "=").
wenzelm@14731
   576
wenzelm@14731
   577
* function INCOMPATIBILITIES: Pi-sets have been redefined and moved from main
paulson@13587
   578
HOL to Library/FuncSet; constant "Fun.op o" is now called "Fun.comp";
paulson@13587
   579
wenzelm@13443
   580
* 'typedef' command has new option "open" to suppress the set
wenzelm@13443
   581
definition;
wenzelm@13443
   582
wenzelm@13522
   583
* functions Min and Max on finite sets have been introduced (theory
wenzelm@13522
   584
Finite_Set);
nipkow@13492
   585
wenzelm@13443
   586
* attribute [symmetric] now works for relations as well; it turns
wenzelm@13443
   587
(x,y) : R^-1 into (y,x) : R, and vice versa;
wenzelm@13443
   588
nipkow@13613
   589
* induct over a !!-quantified statement (say !!x1..xn):
nipkow@13613
   590
  each "case" automatically performs "fix x1 .. xn" with exactly those names.
nipkow@13613
   591
nipkow@13899
   592
* Map: `empty' is no longer a constant but a syntactic abbreviation for
nipkow@13899
   593
%x. None. Warning: empty_def now refers to the previously hidden definition
nipkow@13899
   594
of the empty set.
nipkow@13899
   595
ballarin@14018
   596
* Algebra: formalization of classical algebra.  Intended as base for
ballarin@14018
   597
any algebraic development in Isabelle.  Currently covers group theory
ballarin@14018
   598
(up to Sylow's theorem) and ring theory (Universal Property of
ballarin@14018
   599
Univariate Polynomials).  Contributions welcome;
paulson@13960
   600
paulson@13960
   601
* GroupTheory: deleted, since its material has been moved to Algebra;
paulson@13960
   602
wenzelm@14731
   603
* Complex: new directory of the complex numbers with numeric constants,
wenzelm@14731
   604
nonstandard complex numbers, and some complex analysis, standard and
paulson@13966
   605
nonstandard (Jacques Fleuriot);
paulson@13966
   606
paulson@13966
   607
* HOL-Complex: new image for analysis, replacing HOL-Real and HOL-Hyperreal;
paulson@13966
   608
wenzelm@14731
   609
* Hyperreal: introduced Gauge integration and hyperreal logarithms (Jacques
paulson@13966
   610
Fleuriot);
paulson@13960
   611
wenzelm@13549
   612
* Real/HahnBanach: updated and adapted to locales;
wenzelm@13549
   613
ballarin@13995
   614
* NumberTheory: added Gauss's law of quadratic reciprocity (by Avigad,
ballarin@13995
   615
Gray and Kramer);
paulson@13872
   616
paulson@13872
   617
* UNITY: added the Meier-Sanders theory of progress sets;
paulson@13872
   618
kleing@14011
   619
* MicroJava: bytecode verifier and lightweight bytecode verifier
kleing@14011
   620
as abstract algorithms, instantiated to the JVM;
kleing@14011
   621
schirmer@14010
   622
* Bali: Java source language formalization. Type system, operational
schirmer@14010
   623
semantics, axiomatic semantics. Supported language features:
schirmer@14010
   624
classes, interfaces, objects,virtual methods, static methods,
schirmer@14010
   625
static/instance fields, arrays, access modifiers, definite
schirmer@14010
   626
assignment, exceptions.
wenzelm@13549
   627
kleing@14011
   628
wenzelm@13549
   629
*** ZF ***
wenzelm@13549
   630
webertj@15154
   631
* ZF/Constructible: consistency proof for AC (Gdel's constructible
wenzelm@13549
   632
universe, etc.);
wenzelm@13549
   633
paulson@13872
   634
* Main ZF: virtually all theories converted to new-style format;
nipkow@13518
   635
wenzelm@13280
   636
wenzelm@13478
   637
*** ML ***
wenzelm@13478
   638
wenzelm@13478
   639
* Pure: Tactic.prove provides sane interface for internal proofs;
wenzelm@13478
   640
omits the infamous "standard" operation, so this is more appropriate
wenzelm@13478
   641
than prove_goalw_cterm in many situations (e.g. in simprocs);
wenzelm@13478
   642
wenzelm@13478
   643
* Pure: improved error reporting of simprocs;
wenzelm@13478
   644
wenzelm@13478
   645
* Provers: Simplifier.simproc(_i) provides sane interface for setting
wenzelm@13478
   646
up simprocs;
wenzelm@13478
   647
wenzelm@13478
   648
kleing@13953
   649
*** Document preparation ***
kleing@13953
   650
kleing@13953
   651
* uses \par instead of \\ for line breaks in theory text. This may
kleing@13953
   652
shift some page breaks in large documents. To get the old behaviour
kleing@13953
   653
use \renewcommand{\isanewline}{\mbox{}\\\mbox{}} in root.tex.
kleing@13953
   654
wenzelm@14731
   655
* minimized dependencies of isabelle.sty and isabellesym.sty on
kleing@13953
   656
other packages
kleing@13953
   657
kleing@13953
   658
* \<euro> now needs package babel/greek instead of marvosym (which
kleing@13953
   659
broke \Rightarrow)
kleing@13953
   660
wenzelm@14731
   661
* normal size for \<zero>...\<nine> (uses \mathbf instead of
kleing@13954
   662
textcomp package)
kleing@13953
   663
wenzelm@13280
   664
wenzelm@14572
   665
wenzelm@12984
   666
New in Isabelle2002 (March 2002)
wenzelm@12984
   667
--------------------------------
wenzelm@11474
   668
wenzelm@11572
   669
*** Document preparation ***
wenzelm@11572
   670
wenzelm@11842
   671
* greatly simplified document preparation setup, including more
wenzelm@11842
   672
graceful interpretation of isatool usedir -i/-d/-D options, and more
wenzelm@11842
   673
instructive isatool mkdir; users should basically be able to get
wenzelm@12899
   674
started with "isatool mkdir HOL Test && isatool make"; alternatively,
wenzelm@12899
   675
users may run a separate document processing stage manually like this:
wenzelm@12899
   676
"isatool usedir -D output HOL Test && isatool document Test/output";
wenzelm@11842
   677
wenzelm@11842
   678
* theory dependency graph may now be incorporated into documents;
wenzelm@11842
   679
isatool usedir -g true will produce session_graph.eps/.pdf for use
wenzelm@11842
   680
with \includegraphics of LaTeX;
wenzelm@11842
   681
wenzelm@11864
   682
* proper spacing of consecutive markup elements, especially text
wenzelm@11864
   683
blocks after section headings;
wenzelm@11864
   684
wenzelm@11572
   685
* support bold style (for single symbols only), input syntax is like
wenzelm@11572
   686
this: "\<^bold>\<alpha>" or "\<^bold>A";
wenzelm@11572
   687
wenzelm@11814
   688
* \<bullet> is now output as bold \cdot by default, which looks much
wenzelm@11572
   689
better in printed text;
wenzelm@11572
   690
wenzelm@11712
   691
* added default LaTeX bindings for \<tturnstile> and \<TTurnstile>;
wenzelm@11712
   692
note that these symbols are currently unavailable in Proof General /
wenzelm@12769
   693
X-Symbol; new symbols \<zero>, \<one>, ..., \<nine>, and \<euro>;
wenzelm@12690
   694
wenzelm@12690
   695
* isatool latex no longer depends on changed TEXINPUTS, instead
wenzelm@12690
   696
isatool document copies the Isabelle style files to the target
wenzelm@12690
   697
location;
wenzelm@11712
   698
wenzelm@11572
   699
wenzelm@11633
   700
*** Isar ***
wenzelm@11633
   701
wenzelm@12312
   702
* Pure/Provers: improved proof by cases and induction;
wenzelm@12280
   703
  - 'case' command admits impromptu naming of parameters (such as
wenzelm@12280
   704
    "case (Suc n)");
wenzelm@12280
   705
  - 'induct' method divinates rule instantiation from the inductive
wenzelm@12280
   706
    claim; no longer requires excessive ?P bindings for proper
wenzelm@12280
   707
    instantiation of cases;
wenzelm@12280
   708
  - 'induct' method properly enumerates all possibilities of set/type
wenzelm@12280
   709
    rules; as a consequence facts may be also passed through *type*
wenzelm@12280
   710
    rules without further ado;
wenzelm@12280
   711
  - 'induct' method now derives symbolic cases from the *rulified*
wenzelm@12280
   712
    rule (before it used to rulify cases stemming from the internal
wenzelm@12280
   713
    atomized version); this means that the context of a non-atomic
wenzelm@12280
   714
    statement becomes is included in the hypothesis, avoiding the
wenzelm@12280
   715
    slightly cumbersome show "PROP ?case" form;
wenzelm@12280
   716
  - 'induct' may now use elim-style induction rules without chaining
wenzelm@12280
   717
    facts, using ``missing'' premises from the goal state; this allows
wenzelm@12280
   718
    rules stemming from inductive sets to be applied in unstructured
wenzelm@12280
   719
    scripts, while still benefitting from proper handling of non-atomic
wenzelm@12280
   720
    statements; NB: major inductive premises need to be put first, all
wenzelm@12280
   721
    the rest of the goal is passed through the induction;
wenzelm@12280
   722
  - 'induct' proper support for mutual induction involving non-atomic
wenzelm@12280
   723
    rule statements (uses the new concept of simultaneous goals, see
wenzelm@12280
   724
    below);
wenzelm@12853
   725
  - append all possible rule selections, but only use the first
wenzelm@12853
   726
    success (no backtracking);
wenzelm@11995
   727
  - removed obsolete "(simplified)" and "(stripped)" options of methods;
wenzelm@12754
   728
  - undeclared rule case names default to numbers 1, 2, 3, ...;
wenzelm@12754
   729
  - added 'print_induct_rules' (covered by help item in recent Proof
wenzelm@12754
   730
    General versions);
wenzelm@11995
   731
  - moved induct/cases attributes to Pure, methods to Provers;
wenzelm@11995
   732
  - generic method setup instantiated for FOL and HOL;
wenzelm@11986
   733
wenzelm@12163
   734
* Pure: support multiple simultaneous goal statements, for example
wenzelm@12163
   735
"have a: A and b: B" (same for 'theorem' etc.); being a pure
wenzelm@12163
   736
meta-level mechanism, this acts as if several individual goals had
wenzelm@12163
   737
been stated separately; in particular common proof methods need to be
wenzelm@12163
   738
repeated in order to cover all claims; note that a single elimination
wenzelm@12163
   739
step is *not* sufficient to establish the two conjunctions, so this
wenzelm@12163
   740
fails:
wenzelm@12163
   741
wenzelm@12163
   742
  assume "A & B" then have A and B ..   (*".." fails*)
wenzelm@12163
   743
wenzelm@12163
   744
better use "obtain" in situations as above; alternative refer to
wenzelm@12163
   745
multi-step methods like 'auto', 'simp_all', 'blast+' etc.;
wenzelm@12163
   746
wenzelm@12078
   747
* Pure: proper integration with ``locales''; unlike the original
webertj@15154
   748
version by Florian Kammller, Isar locales package high-level proof
wenzelm@12078
   749
contexts rather than raw logical ones (e.g. we admit to include
wenzelm@12280
   750
attributes everywhere); operations on locales include merge and
wenzelm@12964
   751
rename; support for implicit arguments (``structures''); simultaneous
wenzelm@12964
   752
type-inference over imports and text; see also HOL/ex/Locales.thy for
wenzelm@12964
   753
some examples;
wenzelm@12078
   754
wenzelm@12707
   755
* Pure: the following commands have been ``localized'', supporting a
wenzelm@12707
   756
target locale specification "(in name)": 'lemma', 'theorem',
wenzelm@12707
   757
'corollary', 'lemmas', 'theorems', 'declare'; the results will be
wenzelm@12707
   758
stored both within the locale and at the theory level (exported and
wenzelm@12707
   759
qualified by the locale name);
wenzelm@12707
   760
wenzelm@12964
   761
* Pure: theory goals may now be specified in ``long'' form, with
wenzelm@12964
   762
ad-hoc contexts consisting of arbitrary locale elements. for example
wenzelm@12964
   763
``lemma foo: fixes x assumes "A x" shows "B x"'' (local syntax and
wenzelm@12964
   764
definitions may be given, too); the result is a meta-level rule with
wenzelm@12964
   765
the context elements being discharged in the obvious way;
wenzelm@12964
   766
wenzelm@12964
   767
* Pure: new proof command 'using' allows to augment currently used
wenzelm@12964
   768
facts after a goal statement ('using' is syntactically analogous to
wenzelm@12964
   769
'apply', but acts on the goal's facts only); this allows chained facts
wenzelm@12964
   770
to be separated into parts given before and after a claim, as in
wenzelm@12964
   771
``from a and b have C using d and e <proof>'';
wenzelm@12078
   772
wenzelm@11722
   773
* Pure: renamed "antecedent" case to "rule_context";
wenzelm@11722
   774
wenzelm@12964
   775
* Pure: new 'judgment' command records explicit information about the
wenzelm@12964
   776
object-logic embedding (used by several tools internally); no longer
wenzelm@12964
   777
use hard-wired "Trueprop";
wenzelm@12964
   778
wenzelm@11738
   779
* Pure: added 'corollary' command;
wenzelm@11738
   780
wenzelm@11722
   781
* Pure: fixed 'token_translation' command;
wenzelm@11722
   782
wenzelm@11899
   783
* Pure: removed obsolete 'exported' attribute;
wenzelm@11899
   784
wenzelm@11933
   785
* Pure: dummy pattern "_" in is/let is now automatically lifted over
wenzelm@11933
   786
bound variables: "ALL x. P x --> Q x" (is "ALL x. _ --> ?C x")
wenzelm@11899
   787
supersedes more cumbersome ... (is "ALL x. _ x --> ?C x");
wenzelm@11899
   788
wenzelm@11952
   789
* Pure: method 'atomize' presents local goal premises as object-level
wenzelm@11952
   790
statements (atomic meta-level propositions); setup controlled via
wenzelm@11952
   791
rewrite rules declarations of 'atomize' attribute; example
wenzelm@11952
   792
application: 'induct' method with proper rule statements in improper
wenzelm@11952
   793
proof *scripts*;
wenzelm@11952
   794
wenzelm@12106
   795
* Pure: emulation of instantiation tactics (rule_tac, cut_tac, etc.)
wenzelm@12106
   796
now consider the syntactic context of assumptions, giving a better
wenzelm@12106
   797
chance to get type-inference of the arguments right (this is
wenzelm@12106
   798
especially important for locales);
wenzelm@12106
   799
wenzelm@12312
   800
* Pure: "sorry" no longer requires quick_and_dirty in interactive
wenzelm@12312
   801
mode;
wenzelm@12312
   802
wenzelm@12405
   803
* Pure/obtain: the formal conclusion "thesis", being marked as
wenzelm@12405
   804
``internal'', may no longer be reference directly in the text;
wenzelm@12405
   805
potential INCOMPATIBILITY, may need to use "?thesis" in rare
wenzelm@12405
   806
situations;
wenzelm@12405
   807
wenzelm@12405
   808
* Pure: generic 'sym' attribute which declares a rule both as pure
wenzelm@12405
   809
'elim?' and for the 'symmetric' operation;
wenzelm@12405
   810
wenzelm@12877
   811
* Pure: marginal comments ``--'' may now occur just anywhere in the
wenzelm@12877
   812
text; the fixed correlation with particular command syntax has been
wenzelm@12877
   813
discontinued;
wenzelm@12877
   814
berghofe@13023
   815
* Pure: new method 'rules' is particularly well-suited for proof
berghofe@13023
   816
search in intuitionistic logic; a bit slower than 'blast' or 'fast',
berghofe@13023
   817
but often produces more compact proof terms with less detours;
berghofe@13023
   818
wenzelm@12364
   819
* Pure/Provers/classical: simplified integration with pure rule
wenzelm@12364
   820
attributes and methods; the classical "intro?/elim?/dest?"
wenzelm@12364
   821
declarations coincide with the pure ones; the "rule" method no longer
wenzelm@12364
   822
includes classically swapped intros; "intro" and "elim" methods no
wenzelm@12364
   823
longer pick rules from the context; also got rid of ML declarations
wenzelm@12364
   824
AddXIs/AddXEs/AddXDs; all of this has some potential for
wenzelm@12364
   825
INCOMPATIBILITY;
wenzelm@12364
   826
wenzelm@12405
   827
* Provers/classical: attribute 'swapped' produces classical inversions
wenzelm@12405
   828
of introduction rules;
wenzelm@12405
   829
wenzelm@12364
   830
* Provers/simplifier: 'simplified' attribute may refer to explicit
wenzelm@12364
   831
rules instead of full simplifier context; 'iff' attribute handles
wenzelm@12364
   832
conditional rules;
wenzelm@11936
   833
wenzelm@11745
   834
* HOL: 'typedef' now allows alternative names for Rep/Abs morphisms;
wenzelm@11745
   835
wenzelm@11690
   836
* HOL: 'recdef' now fails on unfinished automated proofs, use
wenzelm@11633
   837
"(permissive)" option to recover old behavior;
wenzelm@11633
   838
wenzelm@11933
   839
* HOL: 'inductive' no longer features separate (collective) attributes
wenzelm@11933
   840
for 'intros' (was found too confusing);
wenzelm@11933
   841
wenzelm@12405
   842
* HOL: properly declared induction rules less_induct and
wenzelm@12405
   843
wf_induct_rule;
wenzelm@12405
   844
kleing@11788
   845
wenzelm@11474
   846
*** HOL ***
wenzelm@11474
   847
wenzelm@11702
   848
* HOL: moved over to sane numeral syntax; the new policy is as
wenzelm@11702
   849
follows:
wenzelm@11702
   850
wenzelm@11702
   851
  - 0 and 1 are polymorphic constants, which are defined on any
wenzelm@11702
   852
  numeric type (nat, int, real etc.);
wenzelm@11702
   853
wenzelm@11702
   854
  - 2, 3, 4, ... and -1, -2, -3, ... are polymorphic numerals, based
wenzelm@11702
   855
  binary representation internally;
wenzelm@11702
   856
wenzelm@11702
   857
  - type nat has special constructor Suc, and generally prefers Suc 0
wenzelm@11702
   858
  over 1::nat and Suc (Suc 0) over 2::nat;
wenzelm@11702
   859
wenzelm@12364
   860
This change may cause significant problems of INCOMPATIBILITY; here
wenzelm@12364
   861
are some hints on converting existing sources:
wenzelm@11702
   862
wenzelm@11702
   863
  - due to the new "num" token, "-0" and "-1" etc. are now atomic
wenzelm@11702
   864
  entities, so expressions involving "-" (unary or binary minus) need
wenzelm@11702
   865
  to be spaced properly;
wenzelm@11702
   866
wenzelm@11702
   867
  - existing occurrences of "1" may need to be constraint "1::nat" or
wenzelm@11702
   868
  even replaced by Suc 0; similar for old "2";
wenzelm@11702
   869
wenzelm@11702
   870
  - replace "#nnn" by "nnn", and "#-nnn" by "-nnn";
wenzelm@11702
   871
wenzelm@11702
   872
  - remove all special provisions on numerals in proofs;
wenzelm@11702
   873
wenzelm@13042
   874
* HOL: simp rules nat_number expand numerals on nat to Suc/0
wenzelm@12837
   875
representation (depends on bin_arith_simps in the default context);
wenzelm@12837
   876
wenzelm@12736
   877
* HOL: symbolic syntax for x^2 (numeral 2);
wenzelm@12736
   878
wenzelm@12335
   879
* HOL: the class of all HOL types is now called "type" rather than
wenzelm@12335
   880
"term"; INCOMPATIBILITY, need to adapt references to this type class
wenzelm@12335
   881
in axclass/classes, instance/arities, and (usually rare) occurrences
wenzelm@12335
   882
in typings (of consts etc.); internally the class is called
wenzelm@12335
   883
"HOL.type", ML programs should refer to HOLogic.typeS;
wenzelm@12335
   884
wenzelm@12280
   885
* HOL/record package improvements:
wenzelm@12280
   886
  - new derived operations "fields" to build a partial record section,
wenzelm@12280
   887
    "extend" to promote a fixed record to a record scheme, and
wenzelm@12280
   888
    "truncate" for the reverse; cf. theorems "xxx.defs", which are *not*
wenzelm@12280
   889
    declared as simp by default;
wenzelm@12587
   890
  - shared operations ("more", "fields", etc.) now need to be always
wenzelm@12587
   891
    qualified) --- potential INCOMPATIBILITY;
wenzelm@12280
   892
  - removed "make_scheme" operations (use "make" with "extend") --
wenzelm@12280
   893
    INCOMPATIBILITY;
wenzelm@11937
   894
  - removed "more" class (simply use "term") -- INCOMPATIBILITY;
wenzelm@12253
   895
  - provides cases/induct rules for use with corresponding Isar
wenzelm@12253
   896
    methods (for concrete records, record schemes, concrete more
wenzelm@12280
   897
    parts, and schematic more parts -- in that order);
wenzelm@11930
   898
  - internal definitions directly based on a light-weight abstract
wenzelm@11930
   899
    theory of product types over typedef rather than datatype;
wenzelm@11930
   900
berghofe@13023
   901
* HOL: generic code generator for generating executable ML code from
berghofe@13023
   902
specifications; specific support for HOL constructs such as inductive
berghofe@13023
   903
datatypes and sets, as well as recursive functions; can be invoked
berghofe@13023
   904
via 'generate_code' theory section;
berghofe@13023
   905
wenzelm@11933
   906
* HOL: canonical cases/induct rules for n-tuples (n = 3..7);
wenzelm@11933
   907
paulson@13824
   908
* HOL: consolidated and renamed several theories.  In particular:
wenzelm@14731
   909
        Ord.thy has been absorbed into HOL.thy
wenzelm@14731
   910
        String.thy has been absorbed into List.thy
wenzelm@14731
   911
wenzelm@11802
   912
* HOL: concrete setsum syntax "\<Sum>i:A. b" == "setsum (%i. b) A"
wenzelm@11802
   913
(beware of argument permutation!);
wenzelm@11802
   914
wenzelm@11657
   915
* HOL: linorder_less_split superseded by linorder_cases;
wenzelm@11657
   916
wenzelm@12917
   917
* HOL/List: "nodups" renamed to "distinct";
nipkow@12889
   918
wenzelm@11633
   919
* HOL: added "The" definite description operator; move Hilbert's "Eps"
paulson@13824
   920
to peripheral theory "Hilbert_Choice"; some INCOMPATIBILITIES:
paulson@13824
   921
  - Ex_def has changed, now need to use some_eq_ex
wenzelm@11437
   922
wenzelm@11572
   923
* HOL: made split_all_tac safe; EXISTING PROOFS MAY FAIL OR LOOP, so
wenzelm@11572
   924
in this (rare) case use:
wenzelm@11572
   925
wenzelm@11572
   926
  delSWrapper "split_all_tac"
wenzelm@11572
   927
  addSbefore ("unsafe_split_all_tac", unsafe_split_all_tac)
wenzelm@11572
   928
wenzelm@11572
   929
* HOL: added safe wrapper "split_conv_tac" to claset; EXISTING PROOFS
wenzelm@11474
   930
MAY FAIL;
nipkow@11361
   931
wenzelm@11572
   932
* HOL: introduced f^n = f o ... o f; warning: due to the limits of
wenzelm@11572
   933
Isabelle's type classes, ^ on functions and relations has too general
wenzelm@11572
   934
a domain, namely ('a * 'b) set and 'a => 'b; this means that it may be
wenzelm@11572
   935
necessary to attach explicit type constraints;
nipkow@11307
   936
wenzelm@12917
   937
* HOL/Relation: the prefix name of the infix "O" has been changed from
wenzelm@12917
   938
"comp" to "rel_comp"; INCOMPATIBILITY: a few theorems have been
wenzelm@12917
   939
renamed accordingly (eg "compI" -> "rel_compI").
nipkow@12489
   940
wenzelm@11487
   941
* HOL: syntax translations now work properly with numerals and records
wenzelm@11487
   942
expressions;
wenzelm@11474
   943
wenzelm@12457
   944
* HOL: bounded abstraction now uses syntax "%" / "\<lambda>" instead
wenzelm@12457
   945
of "lam" -- INCOMPATIBILITY;
wenzelm@11474
   946
wenzelm@11933
   947
* HOL: got rid of some global declarations (potential INCOMPATIBILITY
wenzelm@11933
   948
for ML tools): const "()" renamed "Product_Type.Unity", type "unit"
wenzelm@11933
   949
renamed "Product_Type.unit";
wenzelm@11611
   950
nipkow@12564
   951
* HOL: renamed rtrancl_into_rtrancl2 to converse_rtrancl_into_rtrancl
nipkow@12564
   952
wenzelm@12924
   953
* HOL: removed obsolete theorem "optionE" (use "option.exhaust", or
wenzelm@12924
   954
the "cases" method);
wenzelm@12924
   955
wenzelm@12597
   956
* HOL/GroupTheory: group theory examples including Sylow's theorem (by
webertj@15154
   957
Florian Kammller);
wenzelm@12597
   958
wenzelm@12608
   959
* HOL/IMP: updated and converted to new-style theory format; several
wenzelm@12608
   960
parts turned into readable document, with proper Isar proof texts and
wenzelm@12608
   961
some explanations (by Gerwin Klein);
wenzelm@12597
   962
wenzelm@12734
   963
* HOL-Real: added Complex_Numbers (by Gertrud Bauer);
wenzelm@12734
   964
wenzelm@12690
   965
* HOL-Hyperreal is now a logic image;
wenzelm@12690
   966
wenzelm@11611
   967
wenzelm@12022
   968
*** HOLCF ***
wenzelm@12022
   969
wenzelm@12622
   970
* Isar: consts/constdefs supports mixfix syntax for continuous
wenzelm@12622
   971
operations;
wenzelm@12622
   972
wenzelm@12622
   973
* Isar: domain package adapted to new-style theory format, e.g. see
wenzelm@12622
   974
HOLCF/ex/Dnat.thy;
wenzelm@12622
   975
wenzelm@12622
   976
* theory Lift: proper use of rep_datatype lift instead of ML hacks --
wenzelm@12280
   977
potential INCOMPATIBILITY; now use plain induct_tac instead of former
wenzelm@12280
   978
lift.induct_tac, always use UU instead of Undef;
wenzelm@12022
   979
wenzelm@12597
   980
* HOLCF/IMP: updated and converted to new-style theory;
wenzelm@12597
   981
wenzelm@12022
   982
wenzelm@11474
   983
*** ZF ***
wenzelm@11474
   984
wenzelm@12622
   985
* Isar: proper integration of logic-specific tools and packages,
wenzelm@12622
   986
including theory commands '(co)inductive', '(co)datatype',
wenzelm@12622
   987
'rep_datatype', 'inductive_cases', as well as methods 'ind_cases',
wenzelm@12622
   988
'induct_tac', 'case_tac', and 'typecheck' (with attribute 'TC');
wenzelm@12622
   989
wenzelm@12622
   990
* theory Main no longer includes AC; for the Axiom of Choice, base
wenzelm@12622
   991
your theory on Main_ZFC;
wenzelm@12622
   992
wenzelm@12622
   993
* the integer library now covers quotients and remainders, with many
wenzelm@12622
   994
laws relating division to addition, multiplication, etc.;
paulson@12563
   995
wenzelm@12280
   996
* ZF/UNITY: Chandy and Misra's UNITY is now available in ZF, giving a
wenzelm@12280
   997
typeless version of the formalism;
wenzelm@12280
   998
wenzelm@13025
   999
* ZF/AC, Coind, IMP, Resid: updated and converted to new-style theory
wenzelm@13025
  1000
format;
wenzelm@12608
  1001
wenzelm@12280
  1002
* ZF/Induct: new directory for examples of inductive definitions,
wenzelm@12608
  1003
including theory Multiset for multiset orderings; converted to
wenzelm@12608
  1004
new-style theory format;
wenzelm@12177
  1005
wenzelm@13025
  1006
* ZF: many new theorems about lists, ordinals, etc.;
paulson@12850
  1007
wenzelm@11474
  1008
wenzelm@11474
  1009
*** General ***
wenzelm@11474
  1010
wenzelm@12280
  1011
* Pure/kernel: meta-level proof terms (by Stefan Berghofer); reference
wenzelm@12280
  1012
variable proof controls level of detail: 0 = no proofs (only oracle
wenzelm@12280
  1013
dependencies), 1 = lemma dependencies, 2 = compact proof terms; see
wenzelm@12280
  1014
also ref manual for further ML interfaces;
wenzelm@12280
  1015
wenzelm@12280
  1016
* Pure/axclass: removed obsolete ML interface
wenzelm@12280
  1017
goal_subclass/goal_arity;
wenzelm@12280
  1018
wenzelm@12280
  1019
* Pure/syntax: new token syntax "num" for plain numerals (without "#"
wenzelm@12280
  1020
of "xnum"); potential INCOMPATIBILITY, since -0, -1 etc. are now
wenzelm@12280
  1021
separate tokens, so expressions involving minus need to be spaced
wenzelm@12280
  1022
properly;
wenzelm@12280
  1023
wenzelm@12312
  1024
* Pure/syntax: support non-oriented infixes, using keyword "infix"
wenzelm@12312
  1025
rather than "infixl" or "infixr";
wenzelm@12312
  1026
wenzelm@12312
  1027
* Pure/syntax: concrete syntax for dummy type variables admits genuine
wenzelm@12312
  1028
sort constraint specifications in type inference; e.g. "x::_::foo"
wenzelm@12312
  1029
ensures that the type of "x" is of sort "foo" (but not necessarily a
wenzelm@12312
  1030
type variable);
wenzelm@12280
  1031
wenzelm@12280
  1032
* Pure/syntax: print modes "type_brackets" and "no_type_brackets"
wenzelm@12280
  1033
control output of nested => (types); the default behavior is
wenzelm@12280
  1034
"type_brackets";
wenzelm@12280
  1035
wenzelm@12280
  1036
* Pure/syntax: builtin parse translation for "_constify" turns valued
wenzelm@11817
  1037
tokens into AST constants;
wenzelm@11474
  1038
wenzelm@12280
  1039
* Pure/syntax: prefer later declarations of translations and print
wenzelm@12280
  1040
translation functions; potential INCOMPATIBILITY: need to reverse
wenzelm@12280
  1041
multiple declarations for same syntax element constant;
wenzelm@12280
  1042
wenzelm@12832
  1043
* Pure/show_hyps reset by default (in accordance to existing Isar
wenzelm@12832
  1044
practice);
wenzelm@12832
  1045
wenzelm@12280
  1046
* Provers/classical: renamed addaltern to addafter, addSaltern to
wenzelm@12280
  1047
addSafter;
wenzelm@12280
  1048
wenzelm@12280
  1049
* Provers/clasimp: ``iff'' declarations now handle conditional rules
wenzelm@12280
  1050
as well;
wenzelm@12253
  1051
wenzelm@12538
  1052
* system: tested support for MacOS X; should be able to get Isabelle +
wenzelm@12538
  1053
Proof General to work in a plain Terminal after installing Poly/ML
wenzelm@12538
  1054
(e.g. from the Isabelle distribution area) and GNU bash alone
wenzelm@12538
  1055
(e.g. from http://www.apple.com); full X11, XEmacs and X-Symbol
wenzelm@12538
  1056
support requires further installations, e.g. from
wenzelm@12538
  1057
http://fink.sourceforge.net/);
wenzelm@12538
  1058
wenzelm@12280
  1059
* system: support Poly/ML 4.1.1 (able to manage larger heaps);
wenzelm@11551
  1060
wenzelm@12753
  1061
* system: reduced base memory usage by Poly/ML (approx. 20 MB instead
wenzelm@12753
  1062
of 40 MB), cf. ML_OPTIONS;
wenzelm@12753
  1063
wenzelm@11633
  1064
* system: Proof General keywords specification is now part of the
wenzelm@11633
  1065
Isabelle distribution (see etc/isar-keywords.el);
wenzelm@11633
  1066
wenzelm@12728
  1067
* system: support for persistent Proof General sessions (refrain from
wenzelm@12728
  1068
outdating all loaded theories on startup); user may create writable
wenzelm@12728
  1069
logic images like this: ``isabelle -q HOL Test'';
wenzelm@12597
  1070
wenzelm@11551
  1071
* system: smart selection of Isabelle process versus Isabelle
wenzelm@11572
  1072
interface, accommodates case-insensitive file systems (e.g. HFS+); may
wenzelm@11572
  1073
run both "isabelle" and "Isabelle" even if file names are badly
wenzelm@11572
  1074
damaged (executable inspects the case of the first letter of its own
wenzelm@11572
  1075
name); added separate "isabelle-process" and "isabelle-interface";
wenzelm@11551
  1076
wenzelm@12472
  1077
* system: refrain from any attempt at filtering input streams; no
wenzelm@12472
  1078
longer support ``8bit'' encoding of old isabelle font, instead proper
wenzelm@12472
  1079
iso-latin characters may now be used; the related isatools
wenzelm@12472
  1080
"symbolinput" and "nonascii" have disappeared as well;
wenzelm@12472
  1081
wenzelm@12472
  1082
* system: removed old "xterm" interface (the print modes "xterm" and
wenzelm@12472
  1083
"xterm_color" are still available for direct use in a suitable
wenzelm@12472
  1084
terminal);
wenzelm@12472
  1085
paulson@11314
  1086
oheimb@11169
  1087
wenzelm@11062
  1088
New in Isabelle99-2 (February 2001)
wenzelm@11062
  1089
-----------------------------------
wenzelm@11062
  1090
nipkow@10224
  1091
*** Overview of INCOMPATIBILITIES ***
nipkow@10224
  1092
paulson@11241
  1093
* HOL: please note that theories in the Library and elsewhere often use the
paulson@11241
  1094
new-style (Isar) format; to refer to their theorems in an ML script you must
wenzelm@12622
  1095
bind them to ML identifers by e.g.      val thm_name = thm "thm_name";
paulson@11241
  1096
wenzelm@11043
  1097
* HOL: inductive package no longer splits induction rule aggressively,
wenzelm@11043
  1098
but only as far as specified by the introductions given; the old
oheimb@11130
  1099
format may be recovered via ML function complete_split_rule or attribute
wenzelm@11043
  1100
'split_rule (complete)';
wenzelm@11043
  1101
wenzelm@10998
  1102
* HOL: induct renamed to lfp_induct, lfp_Tarski to lfp_unfold,
wenzelm@10998
  1103
gfp_Tarski to gfp_unfold;
nipkow@10224
  1104
paulson@10288
  1105
* HOL: contrapos, contrapos2 renamed to contrapos_nn, contrapos_pp;
paulson@10288
  1106
wenzelm@10858
  1107
* HOL: infix "dvd" now has priority 50 rather than 70 (because it is a
wenzelm@10858
  1108
relation); infix "^^" has been renamed "``"; infix "``" has been
wenzelm@10858
  1109
renamed "`"; "univalent" has been renamed "single_valued";
nipkow@10793
  1110
wenzelm@10998
  1111
* HOL/Real: "rinv" and "hrinv" replaced by overloaded "inverse"
wenzelm@10998
  1112
operation;
wenzelm@10998
  1113
nipkow@10868
  1114
* HOLCF: infix "`" has been renamed "$"; the symbol syntax is \<cdot>;
nipkow@10856
  1115
wenzelm@10391
  1116
* Isar: 'obtain' no longer declares "that" fact as simp/intro;
wenzelm@10391
  1117
wenzelm@10401
  1118
* Isar/HOL: method 'induct' now handles non-atomic goals; as a
wenzelm@10401
  1119
consequence, it is no longer monotonic wrt. the local goal context
wenzelm@10401
  1120
(which is now passed through the inductive cases);
wenzelm@10401
  1121
wenzelm@10976
  1122
* Document preparation: renamed standard symbols \<ll> to \<lless> and
wenzelm@10976
  1123
\<gg> to \<ggreater>;
wenzelm@10976
  1124
nipkow@10224
  1125
wenzelm@10245
  1126
*** Document preparation ***
wenzelm@10245
  1127
wenzelm@10858
  1128
* \isabellestyle{NAME} selects version of Isabelle output (currently
wenzelm@10858
  1129
available: are "it" for near math-mode best-style output, "sl" for
wenzelm@10858
  1130
slanted text style, and "tt" for plain type-writer; if no
wenzelm@10858
  1131
\isabellestyle command is given, output is according to slanted
wenzelm@10858
  1132
type-writer);
wenzelm@10858
  1133
wenzelm@10322
  1134
* support sub/super scripts (for single symbols only), input syntax is
wenzelm@10322
  1135
like this: "A\<^sup>*" or "A\<^sup>\<star>";
wenzelm@10322
  1136
wenzelm@10858
  1137
* some more standard symbols; see Appendix A of the system manual for
wenzelm@11062
  1138
the complete list of symbols defined in isabellesym.sty;
wenzelm@10858
  1139
wenzelm@10998
  1140
* improved isabelle style files; more abstract symbol implementation
wenzelm@10998
  1141
(should now use \isamath{...} and \isatext{...} in custom symbol
wenzelm@10998
  1142
definitions);
wenzelm@10998
  1143
wenzelm@10634
  1144
* antiquotation @{goals} and @{subgoals} for output of *dynamic* goals
wenzelm@10634
  1145
state; Note that presentation of goal states does not conform to
wenzelm@10634
  1146
actual human-readable proof documents.  Please do not include goal
wenzelm@10634
  1147
states into document output unless you really know what you are doing!
wenzelm@10322
  1148
wenzelm@11062
  1149
* proper indentation of antiquoted output with proportional LaTeX
wenzelm@11062
  1150
fonts;
wenzelm@10862
  1151
wenzelm@11050
  1152
* no_document ML operator temporarily disables LaTeX document
wenzelm@11050
  1153
generation;
wenzelm@11050
  1154
wenzelm@11062
  1155
* isatool unsymbolize tunes sources for plain ASCII communication;
wenzelm@11062
  1156
wenzelm@10322
  1157
wenzelm@10306
  1158
*** Isar ***
wenzelm@10306
  1159
wenzelm@10547
  1160
* Pure: Isar now suffers initial goal statements to contain unbound
wenzelm@10547
  1161
schematic variables (this does not conform to actual readable proof
wenzelm@10547
  1162
documents, due to unpredictable outcome and non-compositional proof
wenzelm@10547
  1163
checking); users who know what they are doing may use schematic goals
wenzelm@10547
  1164
for Prolog-style synthesis of proven results;
wenzelm@10547
  1165
wenzelm@10391
  1166
* Pure: assumption method (an implicit finishing) now handles actual
wenzelm@10391
  1167
rules as well;
wenzelm@10391
  1168
wenzelm@10391
  1169
* Pure: improved 'obtain' --- moved to Pure, insert "that" into
wenzelm@10391
  1170
initial goal, declare "that" only as Pure intro (only for single
wenzelm@10391
  1171
steps); the "that" rule assumption may now be involved in implicit
wenzelm@10391
  1172
finishing, thus ".." becomes a feasible for trivial obtains;
wenzelm@10391
  1173
wenzelm@10391
  1174
* Pure: default proof step now includes 'intro_classes'; thus trivial
wenzelm@10391
  1175
instance proofs may be performed by "..";
wenzelm@10391
  1176
wenzelm@10391
  1177
* Pure: ?thesis / ?this / "..." now work for pure meta-level
wenzelm@10391
  1178
statements as well;
wenzelm@10306
  1179
wenzelm@11097
  1180
* Pure: more robust selection of calculational rules;
wenzelm@11097
  1181
wenzelm@10858
  1182
* Pure: the builtin notion of 'finished' goal now includes the ==-refl
wenzelm@10858
  1183
rule (as well as the assumption rule);
wenzelm@10858
  1184
wenzelm@10858
  1185
* Pure: 'thm_deps' command visualizes dependencies of theorems and
wenzelm@10858
  1186
lemmas, using the graph browser tool;
wenzelm@10858
  1187
wenzelm@10944
  1188
* Pure: predict failure of "show" in interactive mode;
wenzelm@10944
  1189
wenzelm@11016
  1190
* Pure: 'thms_containing' now takes actual terms as arguments;
wenzelm@11016
  1191
wenzelm@10401
  1192
* HOL: improved method 'induct' --- now handles non-atomic goals
wenzelm@10401
  1193
(potential INCOMPATIBILITY); tuned error handling;
wenzelm@10401
  1194
wenzelm@10557
  1195
* HOL: cases and induct rules now provide explicit hints about the
wenzelm@10547
  1196
number of facts to be consumed (0 for "type" and 1 for "set" rules);
wenzelm@10547
  1197
any remaining facts are inserted into the goal verbatim;
wenzelm@10547
  1198
wenzelm@10858
  1199
* HOL: local contexts (aka cases) may now contain term bindings as
wenzelm@10858
  1200
well; the 'cases' and 'induct' methods new provide a ?case binding for
wenzelm@10858
  1201
the result to be shown in each case;
wenzelm@10858
  1202
wenzelm@10770
  1203
* HOL: added 'recdef_tc' command;
wenzelm@10770
  1204
wenzelm@11016
  1205
* isatool convert assists in eliminating legacy ML scripts;
wenzelm@11016
  1206
wenzelm@10306
  1207
wenzelm@10245
  1208
*** HOL ***
wenzelm@10245
  1209
wenzelm@10245
  1210
* HOL/Library: a collection of generic theories to be used together
wenzelm@10245
  1211
with main HOL; the theory loader path already includes this directory
wenzelm@10245
  1212
by default; the following existing theories have been moved here:
wenzelm@10245
  1213
HOL/Induct/Multiset, HOL/Induct/Acc (as Accessible_Part), HOL/While
wenzelm@10337
  1214
(as While_Combinator), HOL/Lex/Prefix (as List_Prefix);
wenzelm@10245
  1215
wenzelm@10966
  1216
* HOL/Unix: "Some aspects of Unix file-system security", a typical
wenzelm@10966
  1217
modelling and verification task performed in Isabelle/HOL +
wenzelm@10966
  1218
Isabelle/Isar + Isabelle document preparation (by Markus Wenzel).
wenzelm@10966
  1219
wenzelm@11094
  1220
* HOL/Algebra: special summation operator SUM no longer exists, it has
wenzelm@11094
  1221
been replaced by setsum; infix 'assoc' now has priority 50 (like
wenzelm@11094
  1222
'dvd'); axiom 'one_not_zero' has been moved from axclass 'ring' to
wenzelm@11094
  1223
'domain', this makes the theory consistent with mathematical
wenzelm@11094
  1224
literature;
wenzelm@11094
  1225
wenzelm@10514
  1226
* HOL basics: added overloaded operations "inverse" and "divide"
wenzelm@10726
  1227
(infix "/"), syntax for generic "abs" operation, generic summation
wenzelm@11094
  1228
operator \<Sum>;
wenzelm@10452
  1229
wenzelm@10391
  1230
* HOL/typedef: simplified package, provide more useful rules (see also
wenzelm@10391
  1231
HOL/subset.thy);
wenzelm@10391
  1232
wenzelm@10915
  1233
* HOL/datatype: induction rule for arbitrarily branching datatypes is
wenzelm@10915
  1234
now expressed as a proper nested rule (old-style tactic scripts may
wenzelm@10915
  1235
require atomize_strip_tac to cope with non-atomic premises);
wenzelm@10915
  1236
wenzelm@10915
  1237
* HOL: renamed theory "Prod" to "Product_Type", renamed "split" rule
wenzelm@10915
  1238
to "split_conv" (old name still available for compatibility);
wenzelm@10915
  1239
wenzelm@10915
  1240
* HOL: improved concrete syntax for strings (e.g. allows translation
wenzelm@10915
  1241
rules with string literals);
wenzelm@10915
  1242
paulson@12245
  1243
* HOL-Real-Hyperreal: this extends HOL-Real with the hyperreals
paulson@12245
  1244
 and Fleuriot's mechanization of analysis, including the transcendental
paulson@12245
  1245
 functions for the reals;
paulson@10756
  1246
wenzelm@11094
  1247
* HOL/Real, HOL/Hyperreal: improved arithmetic simplification;
wenzelm@10391
  1248
wenzelm@10858
  1249
paulson@10474
  1250
*** CTT ***
paulson@10474
  1251
wenzelm@10547
  1252
* CTT: x-symbol support for Pi, Sigma, -->, : (membership); note that
wenzelm@10547
  1253
"lam" is displayed as TWO lambda-symbols
paulson@10474
  1254
wenzelm@10547
  1255
* CTT: theory Main now available, containing everything (that is, Bool
wenzelm@10547
  1256
and Arith);
wenzelm@10547
  1257
paulson@10474
  1258
wenzelm@10391
  1259
*** General ***
wenzelm@10391
  1260
wenzelm@10547
  1261
* Pure: the Simplifier has been implemented properly as a derived rule
wenzelm@10547
  1262
outside of the actual kernel (at last!); the overall performance
wenzelm@10547
  1263
penalty in practical applications is about 50%, while reliability of
wenzelm@10547
  1264
the Isabelle inference kernel has been greatly improved;
wenzelm@10547
  1265
wenzelm@11112
  1266
* print modes "brackets" and "no_brackets" control output of nested =>
wenzelm@11112
  1267
(types) and ==> (props); the default behaviour is "brackets";
wenzelm@11112
  1268
wenzelm@10391
  1269
* Provers: fast_tac (and friends) now handle actual object-logic rules
wenzelm@10391
  1270
as assumptions as well;
wenzelm@10391
  1271
wenzelm@11124
  1272
* system: support Poly/ML 4.0;
wenzelm@11124
  1273
wenzelm@11124
  1274
* system: isatool install handles KDE version 1 or 2;
wenzelm@11124
  1275
wenzelm@10391
  1276
wenzelm@10245
  1277
wenzelm@10103
  1278
New in Isabelle99-1 (October 2000)
wenzelm@10103
  1279
----------------------------------
wenzelm@8015
  1280
wenzelm@10003
  1281
*** Overview of INCOMPATIBILITIES ***
paulson@8014
  1282
wenzelm@8848
  1283
* HOL: simplification of natural numbers is much changed; to partly
wenzelm@8848
  1284
recover the old behaviour (e.g. to prevent n+n rewriting to #2*n)
wenzelm@8848
  1285
issue the following ML commands:
wenzelm@8848
  1286
wenzelm@8848
  1287
  Delsimprocs Nat_Numeral_Simprocs.cancel_numerals;
wenzelm@8848
  1288
  Delsimprocs [Nat_Numeral_Simprocs.combine_numerals];
paulson@8788
  1289
wenzelm@10129
  1290
* HOL: simplification no longer dives into case-expressions; this is
wenzelm@10129
  1291
controlled by "t.weak_case_cong" for each datatype t;
wenzelm@10003
  1292
wenzelm@10003
  1293
* HOL: nat_less_induct renamed to less_induct;
wenzelm@10003
  1294
wenzelm@10003
  1295
* HOL: systematic renaming of the SOME (Eps) rules, may use isatool
wenzelm@10003
  1296
fixsome to patch .thy and .ML sources automatically;
paulson@8967
  1297
wenzelm@10003
  1298
  select_equality  -> some_equality
wenzelm@10003
  1299
  select_eq_Ex     -> some_eq_ex
wenzelm@10003
  1300
  selectI2EX       -> someI2_ex
wenzelm@10003
  1301
  selectI2         -> someI2
wenzelm@10003
  1302
  selectI          -> someI
wenzelm@10003
  1303
  select1_equality -> some1_equality
wenzelm@10003
  1304
  Eps_sym_eq       -> some_sym_eq_trivial
wenzelm@10003
  1305
  Eps_eq           -> some_eq_trivial
wenzelm@10003
  1306
wenzelm@10003
  1307
* HOL: exhaust_tac on datatypes superceded by new generic case_tac;
wenzelm@10003
  1308
wenzelm@10003
  1309
* HOL: removed obsolete theorem binding expand_if (refer to split_if
wenzelm@10003
  1310
instead);
wenzelm@10003
  1311
wenzelm@10003
  1312
* HOL: the recursion equations generated by 'recdef' are now called
wenzelm@10003
  1313
f.simps instead of f.rules;
wenzelm@10003
  1314
wenzelm@10003
  1315
* HOL: qed_spec_mp now also handles bounded ALL as well;
wenzelm@10003
  1316
wenzelm@10003
  1317
* HOL: 0 is now overloaded, so the type constraint ":: nat" may
wenzelm@10003
  1318
sometimes be needed;
wenzelm@10003
  1319
wenzelm@10003
  1320
* HOL: the constant for "f``x" is now "image" rather than "op ``";
paulson@8014
  1321
paulson@10065
  1322
* HOL: the constant for "f-``x" is now "vimage" rather than "op -``";
paulson@10065
  1323
wenzelm@9330
  1324
* HOL: the disjoint sum is now "<+>" instead of "Plus"; the cartesian
wenzelm@9330
  1325
product is now "<*>" instead of "Times"; the lexicographic product is
wenzelm@9330
  1326
now "<*lex*>" instead of "**";
nipkow@8705
  1327
wenzelm@10003
  1328
* HOL: theory Sexp is now in HOL/Induct examples (it used to be part
wenzelm@10003
  1329
of main HOL, but was unused); better use HOL's datatype package;
paulson@9971
  1330
wenzelm@10137
  1331
* HOL: removed "symbols" syntax for constant "override" of theory Map;
wenzelm@10137
  1332
the old syntax may be recovered as follows:
wenzelm@10137
  1333
wenzelm@10137
  1334
  syntax (symbols)
wenzelm@10137
  1335
    override  :: "('a ~=> 'b) => ('a ~=> 'b) => ('a ~=> 'b)"
wenzelm@10137
  1336
      (infixl "\\<oplus>" 100)
wenzelm@10137
  1337
wenzelm@8848
  1338
* HOL/Real: "rabs" replaced by overloaded "abs" function;
wenzelm@8848
  1339
wenzelm@8887
  1340
* HOL/ML: even fewer consts are declared as global (see theories Ord,
wenzelm@8887
  1341
Lfp, Gfp, WF); this only affects ML packages that refer to const names
wenzelm@8887
  1342
internally;
wenzelm@8887
  1343
wenzelm@10003
  1344
* HOL and ZF: syntax for quotienting wrt an equivalence relation
wenzelm@10003
  1345
changed from A/r to A//r;
wenzelm@9908
  1346
wenzelm@10003
  1347
* ZF: new treatment of arithmetic (nat & int) may break some old
wenzelm@10003
  1348
proofs;
wenzelm@8921
  1349
wenzelm@10003
  1350
* Isar: renamed some attributes (RS -> THEN, simplify -> simplified,
wenzelm@10003
  1351
rulify -> rule_format, elimify -> elim_format, ...);
paulson@9542
  1352
wenzelm@9941
  1353
* Isar/Provers: intro/elim/dest attributes changed; renamed
wenzelm@9941
  1354
intro/intro!/intro!! flags to intro!/intro/intro? (in most cases, one
wenzelm@9937
  1355
should have to change intro!! to intro? only); replaced "delrule" by
wenzelm@9937
  1356
"rule del";
wenzelm@9437
  1357
wenzelm@9612
  1358
* Isar/HOL: renamed "intrs" to "intros" in inductive definitions;
wenzelm@9612
  1359
wenzelm@9437
  1360
* Provers: strengthened force_tac by using new first_best_tac;
oheimb@9402
  1361
wenzelm@10003
  1362
* LaTeX document preparation: several changes of isabelle.sty (see
wenzelm@10003
  1363
lib/texinputs);
wenzelm@8729
  1364
paulson@8014
  1365
wenzelm@8487
  1366
*** Document preparation ***
wenzelm@8358
  1367
wenzelm@9198
  1368
* formal comments (text blocks etc.) in new-style theories may now
wenzelm@9753
  1369
contain antiquotations of thm/prop/term/typ/text to be presented
wenzelm@9753
  1370
according to latex print mode; concrete syntax is like this:
wenzelm@9753
  1371
@{term[show_types] "f(x) = a + x"};
wenzelm@9198
  1372
wenzelm@8358
  1373
* isatool mkdir provides easy setup of Isabelle session directories,
wenzelm@8518
  1374
including proper document sources;
wenzelm@8358
  1375
wenzelm@8358
  1376
* generated LaTeX sources are now deleted after successful run
wenzelm@8358
  1377
(isatool document -c); may retain a copy somewhere else via -D option
wenzelm@8358
  1378
of isatool usedir;
wenzelm@8358
  1379
wenzelm@8566
  1380
* isatool usedir -D now lets isatool latex -o sty update the Isabelle
wenzelm@10003
  1381
style files, achieving self-contained LaTeX sources and simplifying
wenzelm@10003
  1382
LaTeX debugging;
wenzelm@8566
  1383
wenzelm@8518
  1384
* old-style theories now produce (crude) LaTeX output as well;
wenzelm@8358
  1385
wenzelm@9057
  1386
* browser info session directories are now self-contained (may be put
wenzelm@9437
  1387
on WWW server seperately); improved graphs of nested sessions; removed
wenzelm@9437
  1388
graph for 'all sessions';
wenzelm@9057
  1389
wenzelm@10003
  1390
* several improvements in isabelle style files; \isabellestyle{it}
wenzelm@10003
  1391
produces fake math mode output; \isamarkupheader is now \section by
wenzelm@10003
  1392
default; see lib/texinputs/isabelle.sty etc.;
wenzelm@9489
  1393
wenzelm@8358
  1394
wenzelm@8184
  1395
*** Isar ***
wenzelm@8184
  1396
wenzelm@10003
  1397
* Isar/Pure: local results and corresponding term bindings are now
wenzelm@10003
  1398
subject to Hindley-Milner polymorphism (similar to ML); this
wenzelm@10003
  1399
accommodates incremental type-inference very nicely;
wenzelm@8283
  1400
wenzelm@10003
  1401
* Isar/Pure: new derived language element 'obtain' supports
wenzelm@10003
  1402
generalized existence reasoning;
wenzelm@8621
  1403
wenzelm@10003
  1404
* Isar/Pure: new calculational elements 'moreover' and 'ultimately'
wenzelm@10003
  1405
support accumulation of results, without applying any rules yet;
wenzelm@10003
  1406
useful to collect intermediate results without explicit name
wenzelm@10003
  1407
references, and for use with transitivity rules with more than 2
wenzelm@10003
  1408
premises;
wenzelm@8184
  1409
wenzelm@10003
  1410
* Isar/Pure: scalable support for case-analysis type proofs: new
wenzelm@10003
  1411
'case' language element refers to local contexts symbolically, as
wenzelm@10003
  1412
produced by certain proof methods; internally, case names are attached
wenzelm@10003
  1413
to theorems as "tags";
wenzelm@8440
  1414
wenzelm@10003
  1415
* Isar/Pure: theory command 'hide' removes declarations from
wenzelm@9330
  1416
class/type/const name spaces;
wenzelm@9330
  1417
wenzelm@10003
  1418
* Isar/Pure: theory command 'defs' supports option "(overloaded)" to
wenzelm@9330
  1419
indicate potential overloading;
wenzelm@9330
  1420
wenzelm@10003
  1421
* Isar/Pure: changed syntax of local blocks from {{ }} to { };
wenzelm@8621
  1422
wenzelm@10003
  1423
* Isar/Pure: syntax of sorts made 'inner', i.e. have to write
wenzelm@10003
  1424
"{a,b,c}" instead of {a,b,c};
wenzelm@9011
  1425
wenzelm@10003
  1426
* Isar/Pure now provides its own version of intro/elim/dest
wenzelm@10003
  1427
attributes; useful for building new logics, but beware of confusion
wenzelm@10003
  1428
with the version in Provers/classical;
wenzelm@9612
  1429
wenzelm@10003
  1430
* Isar/Pure: the local context of (non-atomic) goals is provided via
wenzelm@10003
  1431
case name 'antecedent';
wenzelm@8440
  1432
wenzelm@10003
  1433
* Isar/Pure: removed obsolete 'transfer' attribute (transfer of thms
wenzelm@10003
  1434
to the current context is now done automatically);
wenzelm@9383
  1435
wenzelm@10003
  1436
* Isar/Pure: theory command 'method_setup' provides a simple interface
wenzelm@10003
  1437
for definining proof methods in ML;
wenzelm@9612
  1438
wenzelm@10003
  1439
* Isar/Provers: intro/elim/dest attributes changed; renamed
wenzelm@9941
  1440
intro/intro!/intro!! flags to intro!/intro/intro? (INCOMPATIBILITY, in
wenzelm@9941
  1441
most cases, one should have to change intro!! to intro? only);
wenzelm@9941
  1442
replaced "delrule" by "rule del";
wenzelm@8283
  1443
wenzelm@10003
  1444
* Isar/Provers: new 'hypsubst' method, plain 'subst' method and
wenzelm@10003
  1445
'symmetric' attribute (the latter supercedes [RS sym]);
wenzelm@10003
  1446
wenzelm@10003
  1447
* Isar/Provers: splitter support (via 'split' attribute and 'simp'
wenzelm@10003
  1448
method modifier); 'simp' method: 'only:' modifier removes loopers as
wenzelm@10003
  1449
well (including splits);
wenzelm@10003
  1450
wenzelm@10003
  1451
* Isar/Provers: Simplifier and Classical methods now support all kind
wenzelm@10003
  1452
of modifiers used in the past, including 'cong', 'iff', etc.
wenzelm@10003
  1453
wenzelm@10003
  1454
* Isar/Provers: added 'fastsimp' and 'clarsimp' methods (combination
wenzelm@10003
  1455
of Simplifier and Classical reasoner);
wenzelm@10003
  1456
wenzelm@10003
  1457
* Isar/HOL: new proof method 'cases' and improved version of 'induct'
wenzelm@10003
  1458
now support named cases; major packages (inductive, datatype, primrec,
wenzelm@10003
  1459
recdef) support case names and properly name parameters;
wenzelm@9612
  1460
wenzelm@10003
  1461
* Isar/HOL: new transitivity rules for substitution in inequalities --
wenzelm@10003
  1462
monotonicity conditions are extracted to be proven at end of
wenzelm@10003
  1463
calculations;
wenzelm@10003
  1464
wenzelm@10003
  1465
* Isar/HOL: removed 'case_split' thm binding, should use 'cases' proof
wenzelm@10003
  1466
method anyway;
wenzelm@10003
  1467
wenzelm@10003
  1468
* Isar/HOL: removed old expand_if = split_if; theorems if_splits =
wenzelm@10003
  1469
split_if split_if_asm; datatype package provides theorems foo.splits =
wenzelm@10003
  1470
foo.split foo.split_asm for each datatype;
wenzelm@10003
  1471
wenzelm@10003
  1472
* Isar/HOL: tuned inductive package, rename "intrs" to "intros"
wenzelm@10003
  1473
(potential INCOMPATIBILITY), emulation of mk_cases feature for proof
wenzelm@10003
  1474
scripts: new 'inductive_cases' command and 'ind_cases' method; (Note:
wenzelm@10003
  1475
use "(cases (simplified))" method in proper proof texts);
wenzelm@10003
  1476
wenzelm@10003
  1477
* Isar/HOL: added global 'arith_split' attribute for 'arith' method;
wenzelm@10003
  1478
wenzelm@10003
  1479
* Isar: names of theorems etc. may be natural numbers as well;
wenzelm@10003
  1480
wenzelm@10003
  1481
* Isar: 'pr' command: optional arguments for goals_limit and
wenzelm@9724
  1482
ProofContext.prems_limit; no longer prints theory contexts, but only
wenzelm@9724
  1483
proof states;
wenzelm@8487
  1484
wenzelm@10003
  1485
* Isar: diagnostic commands 'pr', 'thm', 'prop', 'term', 'typ' admit
wenzelm@8518
  1486
additional print modes to be specified; e.g. "pr(latex)" will print
wenzelm@8518
  1487
proof state according to the Isabelle LaTeX style;
wenzelm@8487
  1488
wenzelm@10003
  1489
* Isar: improved support for emulating tactic scripts, including proof
wenzelm@9612
  1490
methods 'rule_tac' etc., 'cut_tac', 'thin_tac', 'subgoal_tac',
wenzelm@9612
  1491
'rename_tac', 'rotate_tac', 'tactic', and 'case_tac' / 'induct_tac'
wenzelm@9612
  1492
(for HOL datatypes);
wenzelm@8534
  1493
wenzelm@10003
  1494
* Isar: simplified (more robust) goal selection of proof methods: 1st
wenzelm@10003
  1495
goal, all goals, or explicit goal specifier (tactic emulation); thus
wenzelm@10003
  1496
'proof method scripts' have to be in depth-first order;
wenzelm@8673
  1497
wenzelm@10003
  1498
* Isar: tuned 'let' syntax: replaced 'as' keyword by 'and';
wenzelm@8729
  1499
wenzelm@10003
  1500
* Isar: removed 'help' command, which hasn't been too helpful anyway;
wenzelm@10003
  1501
should instead use individual commands for printing items
wenzelm@10003
  1502
(print_commands, print_methods etc.);
wenzelm@9224
  1503
wenzelm@10003
  1504
* Isar: added 'nothing' --- the empty list of theorems;
wenzelm@9239
  1505
wenzelm@8184
  1506
paulson@8014
  1507
*** HOL ***
paulson@8014
  1508
wenzelm@10080
  1509
* HOL/MicroJava: formalization of a fragment of Java, together with a
wenzelm@10080
  1510
corresponding virtual machine and a specification of its bytecode
wenzelm@10080
  1511
verifier and a lightweight bytecode verifier, including proofs of
wenzelm@10080
  1512
type-safety; by Gerwin Klein, Tobias Nipkow, David von Oheimb, and
wenzelm@10080
  1513
Cornelia Pusch (see also the homepage of project Bali at
wenzelm@10080
  1514
http://isabelle.in.tum.de/Bali/);
wenzelm@10080
  1515
wenzelm@8518
  1516
* HOL/Algebra: new theory of rings and univariate polynomials, by
wenzelm@8518
  1517
Clemens Ballarin;
paulson@8014
  1518
wenzelm@10157
  1519
* HOL/NumberTheory: fundamental Theorem of Arithmetic, Chinese
wenzelm@10003
  1520
Remainder Theorem, Fermat/Euler Theorem, Wilson's Theorem, by Thomas M
wenzelm@10003
  1521
Rasmussen;
wenzelm@8570
  1522
wenzelm@10157
  1523
* HOL/Lattice: fundamental concepts of lattice theory and order
wenzelm@10157
  1524
structures, including duals, properties of bounds versus algebraic
wenzelm@10157
  1525
laws, lattice operations versus set-theoretic ones, the Knaster-Tarski
wenzelm@10157
  1526
Theorem for complete lattices etc.; may also serve as a demonstration
wenzelm@10157
  1527
for abstract algebraic reasoning using axiomatic type classes, and
wenzelm@10157
  1528
mathematics-style proof in Isabelle/Isar; by Markus Wenzel;
wenzelm@10157
  1529
wenzelm@10003
  1530
* HOL/Prolog: a (bare-bones) implementation of Lambda-Prolog, by David
wenzelm@10003
  1531
von Oheimb;
paulson@9542
  1532
wenzelm@10164
  1533
* HOL/IMPP: extension of IMP with local variables and mutually
wenzelm@10164
  1534
recursive procedures, by David von Oheimb;
wenzelm@10164
  1535
wenzelm@10003
  1536
* HOL/Lambda: converted into new-style theory and document;
paulson@9542
  1537
wenzelm@10003
  1538
* HOL/ex/Multiquote: example of multiple nested quotations and
wenzelm@10003
  1539
anti-quotations -- basically a generalized version of de-Bruijn
wenzelm@10003
  1540
representation; very useful in avoiding lifting of operations;
wenzelm@8848
  1541
wenzelm@9612
  1542
* HOL/record: added general record equality rule to simpset; fixed
wenzelm@9612
  1543
select-update simplification procedure to handle extended records as
wenzelm@9612
  1544
well; admit "r" as field name;
paulson@9542
  1545
paulson@8967
  1546
* HOL: 0 is now overloaded over the new sort "zero", allowing its use with
paulson@8967
  1547
other numeric types and also as the identity of groups, rings, etc.;
paulson@8967
  1548
paulson@8967
  1549
* HOL: new axclass plus_ac0 for addition with the AC-laws and 0 as identity.
paulson@8967
  1550
Types nat and int belong to this axclass;
paulson@8967
  1551
wenzelm@10003
  1552
* HOL: greatly improved simplification involving numerals of type nat, int, real:
paulson@8788
  1553
   (i + #8 + j) = Suc k simplifies to  #7 + (i + j) = k
paulson@8832
  1554
   i*j + k + j*#3*i     simplifies to  #4*(i*j) + k
paulson@8832
  1555
  two terms #m*u and #n*u are replaced by #(m+n)*u
paulson@8832
  1556
    (where #m, #n and u can implicitly be 1; this is simproc combine_numerals)
paulson@8832
  1557
  and the term/formula #m*u+x ~~ #n*u+y simplifies simplifies to #(m-n)+x ~~ y
paulson@8832
  1558
    or x ~~ #(n-m)+y, where ~~ is one of = < <= or - (simproc cancel_numerals);
paulson@8736
  1559
wenzelm@10003
  1560
* HOL: meson_tac is available (previously in ex/meson.ML); it is a
wenzelm@10003
  1561
powerful prover for predicate logic but knows nothing of clasets; see
wenzelm@10003
  1562
ex/mesontest.ML and ex/mesontest2.ML for example applications;
paulson@9835
  1563
wenzelm@8848
  1564
* HOL: new version of "case_tac" subsumes both boolean case split and
wenzelm@8440
  1565
"exhaust_tac" on datatypes; INCOMPATIBILITY: exhaust_tac no longer
wenzelm@8518
  1566
exists, may define val exhaust_tac = case_tac for ad-hoc portability;
wenzelm@8440
  1567
wenzelm@8848
  1568
* HOL: simplification no longer dives into case-expressions: only the
wenzelm@10129
  1569
selector expression is simplified, but not the remaining arms; to
wenzelm@10129
  1570
enable full simplification of case-expressions for datatype t, you may
wenzelm@10129
  1571
remove t.weak_case_cong from the simpset, either globally (Delcongs
wenzelm@10129
  1572
[thm"t.weak_case_cong"];) or locally (delcongs [...]).
nipkow@8603
  1573
wenzelm@8848
  1574
* HOL/recdef: the recursion equations generated by 'recdef' for
wenzelm@8848
  1575
function 'f' are now called f.simps instead of f.rules; if all
wenzelm@8848
  1576
termination conditions are proved automatically, these simplification
wenzelm@8848
  1577
rules are added to the simpset, as in primrec; rules may be named
wenzelm@8848
  1578
individually as well, resulting in a separate list of theorems for
wenzelm@8848
  1579
each equation;
wenzelm@8848
  1580
wenzelm@9489
  1581
* HOL/While is a new theory that provides a while-combinator. It
wenzelm@9489
  1582
permits the definition of tail-recursive functions without the
wenzelm@9489
  1583
provision of a termination measure. The latter is necessary once the
wenzelm@9489
  1584
invariant proof rule for while is applied.
nipkow@9457
  1585
wenzelm@10003
  1586
* HOL: new (overloaded) notation for the set of elements below/above
wenzelm@10003
  1587
some element: {..u}, {..u(}, {l..}, {)l..}. See theory SetInterval.
nipkow@8925
  1588
wenzelm@8848
  1589
* HOL: theorems impI, allI, ballI bound as "strip";
wenzelm@8848
  1590
wenzelm@10003
  1591
* HOL: new tactic induct_thm_tac: thm -> string -> int -> tactic
nipkow@9746
  1592
induct_tac th "x1 ... xn" expects th to have a conclusion of the form
nipkow@9746
  1593
P v1 ... vn and abbreviates res_inst_tac [("v1","x1"),...,("vn","xn")] th;
nipkow@9746
  1594
wenzelm@10003
  1595
* HOL/Real: "rabs" replaced by overloaded "abs" function;
nipkow@9737
  1596
wenzelm@10003
  1597
* HOL: theory Sexp now in HOL/Induct examples (it used to be part of
wenzelm@10003
  1598
main HOL, but was unused);
nipkow@8626
  1599
wenzelm@10003
  1600
* HOL: fewer consts declared as global (e.g. have to refer to
wenzelm@10003
  1601
"Lfp.lfp" instead of "lfp" internally; affects ML packages only);
wenzelm@8887
  1602
wenzelm@10003
  1603
* HOL: tuned AST representation of nested pairs, avoiding bogus output
wenzelm@10003
  1604
in case of overlap with user translations (e.g. judgements over
wenzelm@10003
  1605
tuples); (note that the underlying logical represenation is still
wenzelm@10003
  1606
bogus);
wenzelm@9349
  1607
nipkow@8412
  1608
paulson@9542
  1609
*** ZF ***
paulson@9542
  1610
wenzelm@10003
  1611
* ZF: simplification automatically cancels common terms in arithmetic
wenzelm@10003
  1612
expressions over nat and int;
paulson@9542
  1613
wenzelm@10003
  1614
* ZF: new treatment of nat to minimize type-checking: all operators
wenzelm@10003
  1615
coerce their operands to a natural number using the function natify,
wenzelm@10003
  1616
making the algebraic laws unconditional;
paulson@9542
  1617
wenzelm@10003
  1618
* ZF: as above, for int: operators coerce their operands to an integer
wenzelm@10003
  1619
using the function intify;
paulson@9542
  1620
wenzelm@10003
  1621
* ZF: the integer library now contains many of the usual laws for the
wenzelm@10003
  1622
orderings, including $<=, and monotonicity laws for $+ and $*;
paulson@9542
  1623
wenzelm@10003
  1624
* ZF: new example ZF/ex/NatSum to demonstrate integer arithmetic
wenzelm@10003
  1625
simplification;
paulson@9388
  1626
wenzelm@10003
  1627
* FOL and ZF: AddIffs now available, giving theorems of the form P<->Q
wenzelm@10003
  1628
to the simplifier and classical reasoner simultaneously;
paulson@9388
  1629
paulson@9388
  1630
wenzelm@8358
  1631
*** General ***
wenzelm@8358
  1632
wenzelm@10003
  1633
* Provers: blast_tac now handles actual object-logic rules as
wenzelm@10003
  1634
assumptions; note that auto_tac uses blast_tac internally as well;
wenzelm@10003
  1635
wenzelm@10003
  1636
* Provers: new functions rulify/rulify_no_asm: thm -> thm for turning
wenzelm@10003
  1637
outer -->/All/Ball into ==>/!!; qed_spec_mp now uses rulify_no_asm;
wenzelm@10003
  1638
wenzelm@9941
  1639
* Provers: delrules now handles destruct rules as well (no longer need
wenzelm@9941
  1640
explicit make_elim);
wenzelm@9941
  1641
wenzelm@10003
  1642
* Provers: Blast_tac now warns of and ignores "weak elimination rules" e.g.
wenzelm@10003
  1643
  [| inj ?f;          ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
wenzelm@10003
  1644
use instead the strong form,
wenzelm@10003
  1645
  [| inj ?f; ~ ?W ==> ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
wenzelm@10003
  1646
in HOL, FOL and ZF the function cla_make_elim will create such rules
wenzelm@10003
  1647
from destruct-rules;
wenzelm@9489
  1648
wenzelm@9709
  1649
* Provers: Simplifier.easy_setup provides a fast path to basic
wenzelm@9709
  1650
Simplifier setup for new object-logics;
wenzelm@9709
  1651
wenzelm@9709
  1652
* Pure: AST translation rules no longer require constant head on LHS;
wenzelm@9349
  1653
wenzelm@9709
  1654
* Pure: improved name spaces: ambiguous output is qualified; support
wenzelm@9709
  1655
for hiding of names;
wenzelm@8729
  1656
wenzelm@10003
  1657
* system: smart setup of canonical ML_HOME, ISABELLE_INTERFACE, and
wenzelm@10003
  1658
XSYMBOL_HOME; no longer need to do manual configuration in most
wenzelm@10003
  1659
situations;
wenzelm@10003
  1660
wenzelm@9709
  1661
* system: compression of ML heaps images may now be controlled via -c
wenzelm@9709
  1662
option of isabelle and isatool usedir (currently only observed by
wenzelm@9709
  1663
Poly/ML);
wenzelm@8358
  1664
wenzelm@9981
  1665
* system: isatool installfonts may handle X-Symbol fonts as well (very
wenzelm@9981
  1666
useful for remote X11);
wenzelm@9981
  1667
wenzelm@9709
  1668
* system: provide TAGS file for Isabelle sources;
wenzelm@9052
  1669
wenzelm@9288
  1670
* ML: infix 'OF' is a version of 'MRS' with more appropriate argument
wenzelm@9288
  1671
order;
wenzelm@9288
  1672
wenzelm@8994
  1673
* ML: renamed flags Syntax.trace_norm_ast to Syntax.trace_ast; global
wenzelm@8994
  1674
timing flag supersedes proof_timing and Toplevel.trace;
wenzelm@8994
  1675
wenzelm@10003
  1676
* ML: new combinators |>> and |>>> for incremental transformations
wenzelm@10003
  1677
with secondary results (e.g. certain theory extensions):
wenzelm@10003
  1678
wenzelm@9330
  1679
* ML: PureThy.add_defs gets additional argument to indicate potential
wenzelm@9330
  1680
overloading (usually false);
wenzelm@9330
  1681
wenzelm@10003
  1682
* ML: PureThy.add_thms/add_axioms/add_defs now return theorems as
wenzelm@10003
  1683
results;
wenzelm@8440
  1684
wenzelm@8358
  1685
wenzelm@8015
  1686
wenzelm@7986
  1687
New in Isabelle99 (October 1999)
wenzelm@7986
  1688
--------------------------------
oheimb@4649
  1689
paulson@5931
  1690
*** Overview of INCOMPATIBILITIES (see below for more details) ***
paulson@5931
  1691
paulson@6922
  1692
* HOL: The THEN and ELSE parts of conditional expressions (if P then x else y)
paulson@6922
  1693
are no longer simplified.  (This allows the simplifier to unfold recursive
paulson@6922
  1694
functional programs.)  To restore the old behaviour, declare
wenzelm@7215
  1695
wenzelm@7215
  1696
    Delcongs [if_weak_cong];
paulson@6922
  1697
wenzelm@6269
  1698
* HOL: Removed the obsolete syntax "Compl A"; use -A for set
wenzelm@6269
  1699
complement;
paulson@5931
  1700
wenzelm@6269
  1701
* HOL: the predicate "inj" is now defined by translation to "inj_on";
paulson@6174
  1702
berghofe@7847
  1703
* HOL/datatype: mutual_induct_tac no longer exists --
berghofe@7847
  1704
  use induct_tac "x_1 ... x_n" instead of mutual_induct_tac ["x_1", ..., "x_n"]
berghofe@7847
  1705
wenzelm@6386
  1706
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
  1707
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
  1708
wenzelm@6269
  1709
* ZF: The con_defs part of an inductive definition may no longer refer
wenzelm@6269
  1710
to constants declared in the same theory;
nipkow@6057
  1711
wenzelm@6269
  1712
* HOL, ZF: the function mk_cases, generated by the inductive
wenzelm@6269
  1713
definition package, has lost an argument.  To simplify its result, it
wenzelm@6269
  1714
uses the default simpset instead of a supplied list of theorems.
paulson@6141
  1715
wenzelm@7215
  1716
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
  1717
nipkow@7619
  1718
* Simplifier: the type of the infix ML functions
wenzelm@8729
  1719
        setSSolver addSSolver setSolver addSolver
nipkow@7619
  1720
is now  simpset * solver -> simpset  where `solver' is a new abstract type
nipkow@7619
  1721
for packaging solvers. A solver is created via
wenzelm@8729
  1722
        mk_solver: string -> (thm list -> int -> tactic) -> solver
nipkow@7619
  1723
where the string argument is only a comment.
nipkow@6057
  1724
wenzelm@7647
  1725
paulson@6069
  1726
*** Proof tools ***
paulson@6069
  1727
wenzelm@6343
  1728
* Provers/Arith/fast_lin_arith.ML contains a functor for creating a
wenzelm@6343
  1729
decision procedure for linear arithmetic. Currently it is used for
wenzelm@7593
  1730
types `nat', `int', and `real' in HOL (see below); it can, should and
wenzelm@7593
  1731
will be instantiated for other types and logics as well.
paulson@6069
  1732
nipkow@7324
  1733
* The simplifier now accepts rewrite rules with flexible heads, eg
nipkow@7324
  1734
     hom ?f ==> ?f(?x+?y) = ?f ?x + ?f ?y
nipkow@7324
  1735
  They are applied like any rule with a non-pattern lhs, i.e. by first-order
nipkow@7324
  1736
  matching.
paulson@6069
  1737
wenzelm@7593
  1738
paulson@6014
  1739
*** General ***
paulson@6014
  1740
wenzelm@7986
  1741
* New Isabelle/Isar subsystem provides an alternative to traditional
wenzelm@7215
  1742
tactical theorem proving; together with the ProofGeneral/isar user
wenzelm@7215
  1743
interface it offers an interactive environment for developing human
wenzelm@7215
  1744
readable proof documents (Isar == Intelligible semi-automated
wenzelm@7886
  1745
reasoning); for further information see isatool doc isar-ref,
wenzelm@7986
  1746
src/HOL/Isar_examples and http://isabelle.in.tum.de/Isar/
wenzelm@7886
  1747
wenzelm@9612
  1748
* improved and simplified presentation of theories: better HTML markup
wenzelm@9612
  1749
(including colors), graph views in several sizes; isatool usedir now
wenzelm@9612
  1750
provides a proper interface for user theories (via -P option); actual
wenzelm@9612
  1751
document preparation based on (PDF)LaTeX is available as well (for
wenzelm@9612
  1752
new-style theories only); see isatool doc system for more information;
wenzelm@7215
  1753
wenzelm@7252
  1754
* native support for Proof General, both for classic Isabelle and
wenzelm@7986
  1755
Isabelle/Isar;
wenzelm@7215
  1756
wenzelm@7791
  1757
* ML function thm_deps visualizes dependencies of theorems and lemmas,
wenzelm@7791
  1758
using the graph browser tool;
wenzelm@7791
  1759
wenzelm@6751
  1760
* Isabelle manuals now also available as PDF;
wenzelm@6751
  1761
wenzelm@6449
  1762
* theory loader rewritten from scratch (may not be fully
wenzelm@6449
  1763
bug-compatible); old loadpath variable has been replaced by show_path,
wenzelm@6671
  1764
add_path, del_path, reset_path functions; new operations such as
wenzelm@7593
  1765
update_thy, touch_thy, remove_thy, use/update_thy_only (see also
wenzelm@7593
  1766
isatool doc ref);
wenzelm@6449
  1767
wenzelm@7215
  1768
* improved isatool install: option -k creates KDE application icon,
wenzelm@7215
  1769
option -p DIR installs standalone binaries;
wenzelm@7215
  1770
wenzelm@7215
  1771
* added ML_PLATFORM setting (useful for cross-platform installations);
wenzelm@7215
  1772
more robust handling of platform specific ML images for SML/NJ;
wenzelm@7215
  1773
wenzelm@7886
  1774
* the settings environment is now statically scoped, i.e. it is never
wenzelm@7986
  1775
created again in sub-processes invoked from isabelle, isatool, or
wenzelm@7886
  1776
Isabelle;
wenzelm@7886
  1777
wenzelm@7215
  1778
* path element specification '~~' refers to '$ISABELLE_HOME';
wenzelm@7215
  1779
wenzelm@6343
  1780
* in locales, the "assumes" and "defines" parts may be omitted if
wenzelm@6343
  1781
empty;
wenzelm@5973
  1782
wenzelm@6269
  1783
* new print_mode "xsymbols" for extended symbol support (e.g. genuine
wenzelm@6269
  1784
long arrows);
wenzelm@6259
  1785
wenzelm@6343
  1786
* new print_mode "HTML";
wenzelm@6343
  1787
wenzelm@6343
  1788
* new flag show_tags controls display of tags of theorems (which are
wenzelm@6343
  1789
basically just comments that may be attached by some tools);
wenzelm@6343
  1790
wenzelm@6461
  1791
* Isamode 2.6 requires patch to accomodate change of Isabelle font
wenzelm@6461
  1792
mode and goal output format:
wenzelm@6461
  1793
wenzelm@6461
  1794
diff -r Isamode-2.6/elisp/isa-load.el Isamode/elisp/isa-load.el
wenzelm@6461
  1795
244c244
wenzelm@6461
  1796
<       (list (isa-getenv "ISABELLE") "-msymbols" logic-name)
wenzelm@6461
  1797
---
wenzelm@6533
  1798
>       (list (isa-getenv "ISABELLE") "-misabelle_font" "-msymbols" logic-name)
wenzelm@6461
  1799
diff -r Isabelle-2.6/elisp/isa-proofstate.el Isamode/elisp/isa-proofstate.el
wenzelm@6461
  1800
181c181
wenzelm@6461
  1801
< (defconst proofstate-proofstart-regexp "^Level [0-9]+$"
wenzelm@6461
  1802
---
wenzelm@6461
  1803
> (defconst proofstate-proofstart-regexp "^Level [0-9]+"
wenzelm@6461
  1804
wenzelm@7450
  1805
* function bind_thms stores lists of theorems (cf. bind_thm);
wenzelm@7450
  1806
wenzelm@7593
  1807
* new shorthand tactics ftac, eatac, datac, fatac;
wenzelm@7593
  1808
wenzelm@7593
  1809
* qed (and friends) now accept "" as result name; in that case the
wenzelm@7986
  1810
theorem is not stored, but proper checks and presentation of the
wenzelm@7986
  1811
result still apply;
wenzelm@7593
  1812
wenzelm@7805
  1813
* theorem database now also indexes constants "Trueprop", "all",
wenzelm@7805
  1814
"==>", "=="; thus thms_containing, findI etc. may retrieve more rules;
wenzelm@7805
  1815
oheimb@6028
  1816
nipkow@6057
  1817
*** HOL ***
nipkow@6057
  1818
wenzelm@7215
  1819
** HOL arithmetic **
wenzelm@7215
  1820
wenzelm@6343
  1821
* There are now decision procedures for linear arithmetic over nat and
wenzelm@6343
  1822
int:
nipkow@6131
  1823
wenzelm@6343
  1824
1. arith_tac copes with arbitrary formulae involving `=', `<', `<=',
wenzelm@6343
  1825
`+', `-', `Suc', `min', `max' and numerical constants; other subterms
wenzelm@6343
  1826
are treated as atomic; subformulae not involving type `nat' or `int'
wenzelm@6343
  1827
are ignored; quantified subformulae are ignored unless they are
wenzelm@6343
  1828
positive universal or negative existential. The tactic has to be
wenzelm@6343
  1829
invoked by hand and can be a little bit slow. In particular, the
wenzelm@6343
  1830
running time is exponential in the number of occurrences of `min' and
wenzelm@6343
  1831
`max', and `-' on `nat'.
nipkow@6131
  1832
wenzelm@6343
  1833
2. fast_arith_tac is a cut-down version of arith_tac: it only takes
wenzelm@6343
  1834
(negated) (in)equalities among the premises and the conclusion into
wenzelm@6343
  1835
account (i.e. no compound formulae) and does not know about `min' and
wenzelm@6343
  1836
`max', and `-' on `nat'. It is fast and is used automatically by the
wenzelm@6343
  1837
simplifier.
nipkow@6131
  1838
wenzelm@6343
  1839
NB: At the moment, these decision procedures do not cope with mixed
wenzelm@6343
  1840
nat/int formulae where the two parts interact, such as `m < n ==>
wenzelm@6343
  1841
int(m) < int(n)'.
oheimb@6028
  1842
wenzelm@7215
  1843
* HOL/Numeral provides a generic theory of numerals (encoded
wenzelm@7313
  1844
efficiently as bit strings); setup for types nat/int/real is in place;
wenzelm@7215
  1845
INCOMPATIBILITY: since numeral syntax is now polymorphic, rather than
wenzelm@7215
  1846
int, existing theories and proof scripts may require a few additional
wenzelm@7215
  1847
type constraints;
wenzelm@7215
  1848
wenzelm@7215
  1849
* integer division and remainder can now be performed on constant
wenzelm@7215
  1850
arguments;
paulson@7157
  1851
wenzelm@7215
  1852
* many properties of integer multiplication, division and remainder
wenzelm@7215
  1853
are now available;
paulson@6922
  1854
paulson@7287
  1855
* An interface to the Stanford Validity Checker (SVC) is available through the
paulson@7287
  1856
tactic svc_tac.  Propositional tautologies and theorems of linear arithmetic
paulson@7287
  1857
are proved automatically.  SVC must be installed separately, and its results
paulson@7287
  1858
must be TAKEN ON TRUST (Isabelle does not check the proofs, but tags any
paulson@7287
  1859
invocation of the underlying oracle).  For SVC see
paulson@7444
  1860
  http://verify.stanford.edu/SVC
paulson@6922
  1861
wenzelm@7125
  1862
* IsaMakefile: the HOL-Real target now builds an actual image;
wenzelm@7125
  1863
wenzelm@7215
  1864
wenzelm@7215
  1865
** HOL misc **
wenzelm@7215
  1866
wenzelm@7595
  1867
* HOL/Real/HahnBanach: the Hahn-Banach theorem for real vector spaces
wenzelm@7595
  1868
(in Isabelle/Isar) -- by Gertrud Bauer;
wenzelm@7595
  1869
wenzelm@7691
  1870
* HOL/BCV: generic model of bytecode verification, i.e. data-flow
wenzelm@7691
  1871
analysis for assembly languages with subtypes;
wenzelm@7691
  1872
wenzelm@6278
  1873
* HOL/TLA (Lamport's Temporal Logic of Actions): major reorganization
wenzelm@6278
  1874
-- avoids syntactic ambiguities and treats state, transition, and
wenzelm@6278
  1875
temporal levels more uniformly; introduces INCOMPATIBILITIES due to
wenzelm@6278
  1876
changed syntax and (many) tactics;
wenzelm@6278
  1877
wenzelm@7791
  1878
* HOL/inductive: Now also handles more general introduction rules such
wenzelm@7791
  1879
  as "ALL y. (y, x) : r --> y : acc r ==> x : acc r"; monotonicity
wenzelm@7791
  1880
  theorems are now maintained within the theory (maintained via the
wenzelm@7791
  1881
  "mono" attribute);
berghofe@7780
  1882
wenzelm@7238
  1883
* HOL/datatype: Now also handles arbitrarily branching datatypes
wenzelm@7238
  1884
  (using function types) such as
wenzelm@7238
  1885
wenzelm@7238
  1886
  datatype 'a tree = Atom 'a | Branch "nat => 'a tree"
berghofe@7047
  1887
wenzelm@7326
  1888
* HOL/record: record_simproc (part of the default simpset) takes care
wenzelm@7326
  1889
of selectors applied to updated records; record_split_tac is no longer
wenzelm@7327
  1890
part of the default claset; update_defs may now be removed from the
wenzelm@7327
  1891
simpset in many cases; COMPATIBILITY: old behavior achieved by
wenzelm@7326
  1892
wenzelm@7326
  1893
  claset_ref () := claset() addSWrapper record_split_wrapper;
wenzelm@7326
  1894
  Delsimprocs [record_simproc]
wenzelm@7326
  1895
wenzelm@6386
  1896
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
  1897
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
  1898
paulson@7287
  1899
* HOL/recdef (TFL): 'congs' syntax now expects comma separated list of theorem
paulson@7287
  1900
names rather than an ML expression;
paulson@7287
  1901
paulson@7287
  1902
* HOL/defer_recdef (TFL): like recdef but the well-founded relation can be
paulson@7287
  1903
supplied later.  Program schemes can be defined, such as
paulson@7287
  1904
    "While B C s = (if B s then While B C (C s) else s)"
paulson@7287
  1905
where the well-founded relation can be chosen after B and C have been given.
wenzelm@6563
  1906
wenzelm@7215
  1907
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
  1908
INCOMPATIBILITY: while [] and infix # syntax is still there, of
wenzelm@7215
  1909
course, ML tools referring to List.list.op # etc. have to be adapted;
wenzelm@7215
  1910
wenzelm@7238
  1911
* HOL_quantifiers flag superseded by "HOL" print mode, which is
wenzelm@7238
  1912
disabled by default; run isabelle with option -m HOL to get back to
wenzelm@7238
  1913
the original Gordon/HOL-style output;
wenzelm@7238
  1914
wenzelm@7238
  1915
* HOL/Ord.thy: new bounded quantifier syntax (input only): ALL x<y. P,
wenzelm@7238
  1916
ALL x<=y. P, EX x<y. P, EX x<=y. P;
wenzelm@7238
  1917
wenzelm@7238
  1918
* HOL basic syntax simplified (more orthogonal): all variants of
wenzelm@7238
  1919
All/Ex now support plain / symbolic / HOL notation; plain syntax for
wenzelm@7238
  1920
Eps operator is provided as well: "SOME x. P[x]";
wenzelm@7238
  1921
berghofe@7320
  1922
* HOL/Sum.thy: sum_case has been moved to HOL/Datatype;
wenzelm@7261
  1923
wenzelm@7280
  1924
* HOL/Univ.thy: infix syntax <*>, <+>, <**>, <+> eliminated and made
wenzelm@7280
  1925
thus available for user theories;
wenzelm@7280
  1926
wenzelm@7300
  1927
* HOLCF/IOA/Sequents: renamed 'Cons' to 'Consq' to avoid clash with
wenzelm@7300
  1928
HOL/List; hardly an INCOMPATIBILITY since '>>' syntax is used all the
wenzelm@7300
  1929
time;
wenzelm@7300
  1930
wenzelm@7986
  1931
* HOL: new tactic smp_tac: int -> int -> tactic, which applies spec
wenzelm@7986
  1932
several times and then mp;
oheimb@7492
  1933
wenzelm@7215
  1934
paulson@7113
  1935
*** LK ***
paulson@7113
  1936
wenzelm@7215
  1937
* the notation <<...>> is now available as a notation for sequences of
wenzelm@7215
  1938
formulas;
paulson@7113
  1939
paulson@7113
  1940
* the simplifier is now installed
paulson@7113
  1941
wenzelm@8729
  1942
* the axiom system has been generalized (thanks to Soren Heilmann)
paulson@7113
  1943
paulson@7113
  1944
* the classical reasoner now has a default rule database
paulson@7113
  1945
paulson@7113
  1946
paulson@6064
  1947
*** ZF ***
paulson@6064
  1948
paulson@6064
  1949
* new primrec section allows primitive recursive functions to be given
wenzelm@6269
  1950
directly (as in HOL) over datatypes and the natural numbers;
paulson@6064
  1951
wenzelm@6269
  1952
* new tactics induct_tac and exhaust_tac for induction (or case
wenzelm@6269
  1953
analysis) over datatypes and the natural numbers;
paulson@6064
  1954
paulson@6064
  1955
* the datatype declaration of type T now defines the recursor T_rec;
paulson@6064
  1956
paulson@6141
  1957
* simplification automatically does freeness reasoning for datatype
wenzelm@6269
  1958
constructors;
paulson@6141
  1959
wenzelm@6269
  1960
* automatic type-inference, with AddTCs command to insert new
wenzelm@6269
  1961
type-checking rules;
paulson@6155
  1962
wenzelm@6269
  1963
* datatype introduction rules are now added as Safe Introduction rules
wenzelm@6269
  1964
to the claset;
paulson@6155
  1965
wenzelm@6269
  1966
* the syntax "if P then x else y" is now available in addition to
wenzelm@6269
  1967
if(P,x,y);
wenzelm@6269
  1968
paulson@6069
  1969
wenzelm@6343
  1970
*** Internal programming interfaces ***
wenzelm@6343
  1971
wenzelm@7919
  1972
* tuned simplifier trace output; new flag debug_simp;
wenzelm@7919
  1973
wenzelm@7420
  1974
* structures Vartab / Termtab (instances of TableFun) offer efficient
wenzelm@7420
  1975
tables indexed by indexname_ord / term_ord (compatible with aconv);
wenzelm@7420
  1976
wenzelm@6386
  1977
* AxClass.axclass_tac lost the theory argument;
wenzelm@6386
  1978
wenzelm@6343
  1979
* tuned current_goals_markers semantics: begin / end goal avoids
wenzelm@6343
  1980
printing empty lines;
wenzelm@6343
  1981
wenzelm@6343
  1982
* removed prs and prs_fn hook, which was broken because it did not
wenzelm@6343
  1983
include \n in its semantics, forcing writeln to add one
wenzelm@6343
  1984
uncoditionally; replaced prs_fn by writeln_fn; consider std_output:
wenzelm@6343
  1985
string -> unit if you really want to output text without newline;
wenzelm@6343
  1986
wenzelm@6343
  1987
* Symbol.output subject to print mode; INCOMPATIBILITY: defaults to
wenzelm@6343
  1988
plain output, interface builders may have to enable 'isabelle_font'
wenzelm@6343
  1989
mode to get Isabelle font glyphs as before;
wenzelm@6343
  1990
wenzelm@6343
  1991
* refined token_translation interface; INCOMPATIBILITY: output length
wenzelm@6343
  1992
now of type real instead of int;
wenzelm@6343
  1993
wenzelm@7196
  1994
* theory loader actions may be traced via new ThyInfo.add_hook
wenzelm@7196
  1995
interface (see src/Pure/Thy/thy_info.ML); example application: keep
wenzelm@7196
  1996
your own database of information attached to *whole* theories -- as
wenzelm@7196
  1997
opposed to intra-theory data slots offered via TheoryDataFun;
wenzelm@7196
  1998
wenzelm@7647
  1999
* proper handling of dangling sort hypotheses (at last!);
wenzelm@7647
  2000
Thm.strip_shyps and Drule.strip_shyps_warning take care of removing
wenzelm@7647
  2001
extra sort hypotheses that can be witnessed from the type signature;
wenzelm@7986
  2002
the force_strip_shyps flag is gone, any remaining shyps are simply
wenzelm@7986
  2003
left in the theorem (with a warning issued by strip_shyps_warning);
wenzelm@7647
  2004
wenzelm@6343
  2005
paulson@6064
  2006
wenzelm@5781
  2007
New in Isabelle98-1 (October 1998)
wenzelm@5781
  2008
----------------------------------
wenzelm@5781
  2009
wenzelm@5127
  2010
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4842
  2011
wenzelm@5726
  2012
* several changes of automated proof tools;
wenzelm@5373
  2013
wenzelm@5726
  2014
* HOL: major changes to the inductive and datatype packages, including
wenzelm@5726
  2015
some minor incompatibilities of theory syntax;
berghofe@5214
  2016
wenzelm@5726
  2017
* HOL: renamed r^-1 to 'converse' from 'inverse'; 'inj_onto' is now
wenzelm@5217
  2018
called `inj_on';
paulson@5160
  2019
nipkow@5275
  2020
* HOL: removed duplicate thms in Arith:
nipkow@5275
  2021
  less_imp_add_less  should be replaced by  trans_less_add1
nipkow@5275
  2022
  le_imp_add_le      should be replaced by  trans_le_add1
paulson@5160
  2023
wenzelm@5726
  2024
* HOL: unary minus is now overloaded (new type constraints may be
wenzelm@5726
  2025
required);
paulson@5490
  2026
wenzelm@5726
  2027
* HOL and ZF: unary minus for integers is now #- instead of #~.  In
wenzelm@5726
  2028
ZF, expressions such as n#-1 must be changed to n#- 1, since #-1 is
wenzelm@5726
  2029
now taken as an integer constant.
paulson@5541
  2030
wenzelm@5726
  2031
* Pure: ML function 'theory_of' renamed to 'theory';
wenzelm@5397
  2032
wenzelm@5363
  2033
wenzelm@5127
  2034
*** Proof tools ***
nipkow@4880
  2035
nipkow@5657
  2036
* Simplifier:
nipkow@5657
  2037
  1. Asm_full_simp_tac is now more aggressive.
nipkow@5657
  2038
     1. It will sometimes reorient premises if that increases their power to
nipkow@5657
  2039
        simplify.
nipkow@5657
  2040
     2. It does no longer proceed strictly from left to right but may also
nipkow@5657
  2041
        rotate premises to achieve further simplification.
nipkow@5657
  2042
     For compatibility reasons there is now Asm_lr_simp_tac which is like the
nipkow@5657
  2043
     old Asm_full_simp_tac in that it does not rotate premises.
nipkow@5657
  2044
  2. The simplifier now knows a little bit about nat-arithmetic.
nipkow@4880
  2045
wenzelm@5127
  2046
* Classical reasoner: wrapper mechanism for the classical reasoner now
wenzelm@5127
  2047
allows for selected deletion of wrappers, by introduction of names for
wenzelm@5127
  2048
wrapper functionals.  This implies that addbefore, addSbefore,
wenzelm@5127
  2049
addaltern, and addSaltern now take a pair (name, tactic) as argument,
wenzelm@5127
  2050
and that adding two tactics with the same name overwrites the first
wenzelm@5127
  2051
one (emitting a warning).
oheimb@4824
  2052
  type wrapper = (int -> tactic) -> (int -> tactic)
oheimb@4649
  2053
  setWrapper, setSWrapper, compWrapper and compSWrapper are replaced by
oheimb@4824
  2054
  addWrapper, addSWrapper: claset * (string * wrapper) -> claset
oheimb@4824
  2055
  delWrapper, delSWrapper: claset *  string            -> claset
oheimb@4649
  2056
  getWrapper is renamed to appWrappers, getSWrapper to appSWrappers;
oheimb@4649
  2057
wenzelm@5705
  2058
* Classical reasoner: addbefore/addSbefore now have APPEND/ORELSE
wenzelm@5726
  2059
semantics; addbefore now affects only the unsafe part of step_tac
wenzelm@5726
  2060
etc.; this affects addss/auto_tac/force_tac, so EXISTING PROOFS MAY
wenzelm@5726
  2061
FAIL, but proofs should be fixable easily, e.g. by replacing Auto_tac
wenzelm@5726
  2062
by Force_tac;
oheimb@5524
  2063
wenzelm@5726
  2064
* Classical reasoner: setwrapper to setWrapper and compwrapper to
wenzelm@5726
  2065
compWrapper; added safe wrapper (and access functions for it);
oheimb@5524
  2066
wenzelm@5127
  2067
* HOL/split_all_tac is now much faster and fails if there is nothing
wenzelm@5726
  2068
to split.  Some EXISTING PROOFS MAY REQUIRE ADAPTION because the order
wenzelm@5726
  2069
and the names of the automatically generated variables have changed.
wenzelm@5726
  2070
split_all_tac has moved within claset() from unsafe wrappers to safe
wenzelm@5726
  2071
wrappers, which means that !!-bound variables are split much more
wenzelm@5726
  2072
aggressively, and safe_tac and clarify_tac now split such variables.
wenzelm@5726
  2073
If this splitting is not appropriate, use delSWrapper "split_all_tac".
wenzelm@5726
  2074
Note: the same holds for record_split_tac, which does the job of
wenzelm@5726
  2075
split_all_tac for record fields.
wenzelm@5127
  2076
wenzelm@5726
  2077
* HOL/Simplifier: Rewrite rules for case distinctions can now be added
wenzelm@5726
  2078
permanently to the default simpset using Addsplits just like
wenzelm@5726
  2079
Addsimps. They can be removed via Delsplits just like
wenzelm@5726
  2080
Delsimps. Lower-case versions are also available.
wenzelm@5127
  2081
wenzelm@5726
  2082
* HOL/Simplifier: The rule split_if is now part of the default
wenzelm@5726
  2083
simpset. This means that the simplifier will eliminate all occurrences
wenzelm@5726
  2084
of if-then-else in the conclusion of a goal. To prevent this, you can
wenzelm@5726
  2085
either remove split_if completely from the default simpset by
wenzelm@5726
  2086
`Delsplits [split_if]' or remove it in a specific call of the
wenzelm@5726
  2087
simplifier using `... delsplits [split_if]'.  You can also add/delete
wenzelm@5726
  2088
other case splitting rules to/from the default simpset: every datatype
wenzelm@5726
  2089
generates suitable rules `split_t_case' and `split_t_case_asm' (where
wenzelm@5726
  2090
t is the name of the datatype).
wenzelm@5127
  2091
wenzelm@5726
  2092
* Classical reasoner / Simplifier combination: new force_tac (and
wenzelm@5127
  2093
derivatives Force_tac, force) combines rewriting and classical
wenzelm@5127
  2094
reasoning (and whatever other tools) similarly to auto_tac, but is
wenzelm@5726
  2095
aimed to solve the given subgoal completely.
wenzelm@5127
  2096
wenzelm@5127
  2097
wenzelm@5127
  2098
*** General ***
wenzelm@5127
  2099
wenzelm@5217
  2100
* new top-level commands `Goal' and `Goalw' that improve upon `goal'
wenzelm@5127
  2101
and `goalw': the theory is no longer needed as an explicit argument -
wenzelm@5127
  2102
the current theory context is used; assumptions are no longer returned
wenzelm@5127
  2103
at the ML-level unless one of them starts with ==> or !!; it is
wenzelm@5217
  2104
recommended to convert to these new commands using isatool fixgoal
wenzelm@5217
  2105
(backup your sources first!);
wenzelm@4842
  2106
wenzelm@5217
  2107
* new top-level commands 'thm' and 'thms' for retrieving theorems from
wenzelm@5207
  2108
the current theory context, and 'theory' to lookup stored theories;
paulson@4806
  2109
paulson@5722
  2110
* new theory section 'locale' for declaring constants, assumptions and
paulson@5722
  2111
definitions that have local scope;
paulson@5722
  2112
wenzelm@5127
  2113
* new theory section 'nonterminals' for purely syntactic types;
wenzelm@4858
  2114
wenzelm@5127
  2115
* new theory section 'setup' for generic ML setup functions
wenzelm@5127
  2116
(e.g. package initialization);
wenzelm@4869
  2117
wenzelm@5131
  2118
* the distribution now includes Isabelle icons: see
wenzelm@5131
  2119
lib/logo/isabelle-{small,tiny}.xpm;
wenzelm@5131
  2120
wenzelm@5363
  2121
* isatool install - install binaries with absolute references to
wenzelm@5363
  2122
ISABELLE_HOME/bin;
wenzelm@5363
  2123
wenzelm@5572
  2124
* isatool logo -- create instances of the Isabelle logo (as EPS);
wenzelm@5572
  2125
wenzelm@5407
  2126
* print mode 'emacs' reserved for Isamode;
wenzelm@5407
  2127
wenzelm@5726
  2128
* support multiple print (ast) translations per constant name;
wenzelm@5726
  2129
wenzelm@6925
  2130
* theorems involving oracles are now printed with a suffixed [!];
wenzelm@6925
  2131
wenzelm@4711
  2132
paulson@4661
  2133
*** HOL ***
paulson@4661
  2134
wenzelm@5710
  2135
* there is now a tutorial on Isabelle/HOL (do 'isatool doc tutorial');
nipkow@5709
  2136
wenzelm@5217
  2137
* HOL/inductive package reorganized and improved: now supports mutual
paulson@5267
  2138
definitions such as
wenzelm@5217
  2139
wenzelm@5217
  2140
  inductive EVEN ODD
wenzelm@5217
  2141
    intrs
wenzelm@5217
  2142
      null "0 : EVEN"
wenzelm@5217
  2143
      oddI "n : EVEN ==> Suc n : ODD"
wenzelm@5217
  2144
      evenI "n : ODD ==> Suc n : EVEN"
wenzelm@5217
  2145
wenzelm@5217
  2146
new theorem list "elims" contains an elimination rule for each of the
wenzelm@5217
  2147
recursive sets; inductive definitions now handle disjunctive premises
wenzelm@5217
  2148
correctly (also ZF);
berghofe@5214
  2149
wenzelm@5217
  2150
INCOMPATIBILITIES: requires Inductive as an ancestor; component
wenzelm@5217
  2151
"mutual_induct" no longer exists - the induction rule is always
wenzelm@5217
  2152
contained in "induct";
wenzelm@5217
  2153
wenzelm@5217
  2154
wenzelm@5217
  2155
* HOL/datatype package re-implemented and greatly improved: now
paulson@5267
  2156
supports mutually recursive datatypes such as
wenzelm@5217
  2157
wenzelm@5217
  2158
  datatype
wenzelm@5217
  2159
    'a aexp = IF_THEN_ELSE ('a bexp) ('a aexp) ('a aexp)
wenzelm@5217
  2160
            | SUM ('a aexp) ('a aexp)
wenzelm@5217
  2161
            | DIFF ('a aexp) ('a aexp)
wenzelm@5217
  2162
            | NUM 'a
wenzelm@5217
  2163
  and
wenzelm@5217
  2164
    'a bexp = LESS ('a aexp) ('a aexp)
wenzelm@5217
  2165
            | AND ('a bexp) ('a bexp)
wenzelm@5217
  2166
            | OR ('a bexp) ('a bexp)
wenzelm@5217
  2167
paulson@5267
  2168
as well as indirectly recursive datatypes such as
berghofe@5214
  2169
wenzelm@5217
  2170
  datatype
wenzelm@5217
  2171
    ('a, 'b) term = Var 'a
wenzelm@5217
  2172
                  | App 'b ((('a, 'b) term) list)
berghofe@5214
  2173
wenzelm@5217
  2174
The new tactic  mutual_induct_tac [<var_1>, ..., <var_n>] i  performs
wenzelm@5217
  2175
induction on mutually / indirectly recursive datatypes.
wenzelm@5217
  2176
wenzelm@5217
  2177
Primrec equations are now stored in theory and can be accessed via
wenzelm@5217
  2178
<function_name>.simps.
wenzelm@5217
  2179
wenzelm@5217
  2180
INCOMPATIBILITIES:
berghofe@5214
  2181
wenzelm@5217
  2182
  - Theories using datatypes must now have theory Datatype as an
wenzelm@5217
  2183
    ancestor.
wenzelm@5217
  2184
  - The specific <typename>.induct_tac no longer exists - use the
wenzelm@5217
  2185
    generic induct_tac instead.
berghofe@5226
  2186
  - natE has been renamed to nat.exhaust - use exhaust_tac
wenzelm@5217
  2187
    instead of res_inst_tac ... natE. Note that the variable
berghofe@5226
  2188
    names in nat.exhaust differ from the names in natE, this
wenzelm@5217
  2189
    may cause some "fragile" proofs to fail.
wenzelm@5217
  2190
  - The theorems split_<typename>_case and split_<typename>_case_asm
wenzelm@5217
  2191
    have been renamed to <typename>.split and <typename>.split_asm.
wenzelm@5217
  2192
  - Since default sorts of type variables are now handled correctly,
wenzelm@5217
  2193
    some datatype definitions may have to be annotated with explicit
wenzelm@5217
  2194
    sort constraints.
wenzelm@5217
  2195
  - Primrec definitions no longer require function name and type
wenzelm@5217
  2196
    of recursive argument.
berghofe@5214
  2197
wenzelm@5217
  2198
Consider using isatool fixdatatype to adapt your theories and proof
wenzelm@5217
  2199
scripts to the new package (backup your sources first!).
wenzelm@5217
  2200
wenzelm@5217
  2201
wenzelm@5726
  2202
* HOL/record package: considerably improved implementation; now
wenzelm@5726
  2203
includes concrete syntax for record types, terms, updates; theorems
wenzelm@5726
  2204
for surjective pairing and splitting !!-bound record variables; proof
wenzelm@5726
  2205
support is as follows:
wenzelm@5726
  2206
wenzelm@5726
  2207
  1) standard conversions (selectors or updates applied to record
wenzelm@5726
  2208
constructor terms) are part of the standard simpset;
wenzelm@5726
  2209
wenzelm@5726
  2210
  2) inject equations of the form ((x, y) = (x', y')) == x=x' & y=y' are
wenzelm@5726
  2211
made part of standard simpset and claset via addIffs;
wenzelm@5726
  2212
wenzelm@5726
  2213
  3) a tactic for record field splitting (record_split_tac) is part of
wenzelm@5726
  2214
the standard claset (addSWrapper);
wenzelm@5726
  2215
wenzelm@5726
  2216
To get a better idea about these rules you may retrieve them via
wenzelm@5726
  2217
something like 'thms "foo.simps"' or 'thms "foo.iffs"', where "foo" is
wenzelm@5726
  2218
the name of your record type.
wenzelm@5726
  2219
wenzelm@5726
  2220
The split tactic 3) conceptually simplifies by the following rule:
wenzelm@5726
  2221
wenzelm@5726
  2222
  "(!!x. PROP ?P x) == (!!a b. PROP ?P (a, b))"
wenzelm@5726
  2223
wenzelm@5726
  2224
Thus any record variable that is bound by meta-all will automatically
wenzelm@5726
  2225
blow up into some record constructor term, consequently the
wenzelm@5726
  2226
simplifications of 1), 2) apply.  Thus force_tac, auto_tac etc. shall
wenzelm@5726
  2227
solve record problems automatically.
wenzelm@5726
  2228
berghofe@5214
  2229
wenzelm@5125
  2230
* reorganized the main HOL image: HOL/Integ and String loaded by
wenzelm@5125
  2231
default; theory Main includes everything;
wenzelm@5125
  2232
paulson@5650
  2233
* automatic simplification of integer sums and comparisons, using cancellation;
paulson@5650
  2234
oheimb@5526
  2235
* added option_map_eq_Some and not_Some_eq to the default simpset and claset;
wenzelm@5127
  2236
wenzelm@5127
  2237
* added disj_not1 = "(~P | Q) = (P --> Q)" to the default simpset;
wenzelm@5127
  2238
wenzelm@5127
  2239
* many new identities for unions, intersections, set difference, etc.;
wenzelm@5127
  2240
wenzelm@5127
  2241
* expand_if, expand_split, expand_sum_case and expand_nat_case are now
wenzelm@5127
  2242
called split_if, split_split, split_sum_case and split_nat_case (to go
wenzelm@5127
  2243
with add/delsplits);
wenzelm@5125
  2244
wenzelm@5127
  2245
* HOL/Prod introduces simplification procedure unit_eq_proc rewriting
wenzelm@5127
  2246
(?x::unit) = (); this is made part of the default simpset, which COULD
wenzelm@5127
  2247
MAKE EXISTING PROOFS FAIL under rare circumstances (consider
wenzelm@5207
  2248
'Delsimprocs [unit_eq_proc];' as last resort); also note that
wenzelm@5207
  2249
unit_abs_eta_conv is added in order to counter the effect of
wenzelm@5207
  2250
unit_eq_proc on (%u::unit. f u), replacing it by f rather than by
wenzelm@5207
  2251
%u.f();
wenzelm@5125
  2252
wenzelm@5217
  2253
* HOL/Fun INCOMPATIBILITY: `inj_onto' is now called `inj_on' (which
wenzelm@5217
  2254
makes more sense);
berghofe@5109
  2255
paulson@5475
  2256
* HOL/Set INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
  2257
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
  2258
  disjointness reasoning but breaking a few old proofs.
paulson@5267
  2259
wenzelm@5217
  2260
* HOL/Relation INCOMPATIBILITY: renamed the relational operator r^-1
wenzelm@5217
  2261
to 'converse' from 'inverse' (for compatibility with ZF and some
wenzelm@5217
  2262
literature);
wenzelm@5085
  2263
wenzelm@5127
  2264
* HOL/recdef can now declare non-recursive functions, with {} supplied as
wenzelm@5127
  2265
the well-founded relation;
oheimb@4838
  2266
paulson@5490
  2267
* HOL/Set INCOMPATIBILITY: the complement of set A is now written -A instead of
paulson@5490
  2268
    Compl A.  The "Compl" syntax remains available as input syntax for this
paulson@5490
  2269
    release ONLY.
paulson@5490
  2270
wenzelm@5127
  2271
* HOL/Update: new theory of function updates:
wenzelm@5127
  2272
    f(a:=b) == %x. if x=a then b else f x
wenzelm@5127
  2273
may also be iterated as in f(a:=b,c:=d,...);
nipkow@5077
  2274
wenzelm@5127
  2275
* HOL/Vimage: new theory for inverse image of a function, syntax f-``B;
paulson@4899
  2276
nipkow@5282
  2277
* HOL/List:
nipkow@5282
  2278
  - new function list_update written xs[i:=v] that updates the i-th
nipkow@5282
  2279
    list position. May also be iterated as in xs[i:=a,j:=b,...].
nipkow@5428
  2280
  - new function `upt' written [i..j(] which generates the list
nipkow@5428
  2281
    [i,i+1,...,j-1], i.e. the upper bound is excluded. To include the upper
nipkow@5428
  2282
    bound write [i..j], which is a shorthand for [i..j+1(].
nipkow@5282
  2283
  - new lexicographic orderings and corresponding wellfoundedness theorems.
paulson@4779
  2284
wenzelm@5127
  2285
* HOL/Arith:
wenzelm@5127
  2286
  - removed 'pred' (predecessor) function;
wenzelm@5127
  2287
  - generalized some theorems about n-1;
wenzelm@5127
  2288
  - many new laws about "div" and "mod";
wenzelm@5127
  2289
  - new laws about greatest common divisors (see theory ex/Primes);
oheimb@4766
  2290
wenzelm@5127
  2291
* HOL/Relation: renamed the relational operator r^-1 "converse"
wenzelm@4842
  2292
instead of "inverse";
wenzelm@4711
  2293
nipkow@5651
  2294
* HOL/Induct/Multiset: a theory of multisets, including the wellfoundedness
nipkow@5651
  2295
  of the multiset ordering;
nipkow@5651
  2296
wenzelm@5127
  2297
* directory HOL/Real: a construction of the reals using Dedekind cuts
nipkow@5651
  2298
  (not included by default);
nipkow@4835
  2299
wenzelm@5127
  2300
* directory HOL/UNITY: Chandy and Misra's UNITY formalism;
wenzelm@4711
  2301
nipkow@5651
  2302
* directory HOL/Hoare: a new version of Hoare logic which permits many-sorted
nipkow@5651
  2303
  programs, i.e. different program variables may have different types.
nipkow@5651
  2304
paulson@5142
  2305
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
  2306
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
  2307
  Now rew can involve either definitions or equalities (either == or =).
wenzelm@5002
  2308
wenzelm@5363
  2309
paulson@4879
  2310
*** ZF ***
paulson@4879
  2311
paulson@5332
  2312
* theory Main includes everything; INCOMPATIBILITY: theory ZF.thy contains
paulson@5332
  2313
  only the theorems proved on ZF.ML;
paulson@5160
  2314
paulson@5475
  2315
* ZF INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
  2316
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
  2317
  disjointness reasoning but breaking a few old proofs.
paulson@5267
  2318
paulson@5160
  2319
* ZF/Update: new theory of function updates
paulson@5160
  2320
    with default rewrite rule  f(x:=y) ` z = if(z=x, y, f`z)
paulson@5160
  2321
  may also be iterated as in f(a:=b,c:=d,...);
paulson@5160
  2322
paulson@4879
  2323
* in  let x=t in u(x), neither t nor u(x) has to be an FOL term.
oheimb@4649
  2324
paulson@5142
  2325
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
  2326
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
  2327
  Now rew can involve either definitions or equalities (either == or =).
paulson@5142
  2328
paulson@5160
  2329
* case_tac provided for compatibility with HOL
paulson@5160
  2330
    (like the old excluded_middle_tac, but with subgoals swapped)
paulson@5160
  2331
wenzelm@4842
  2332
wenzelm@5127
  2333
*** Internal programming interfaces ***
wenzelm@5002
  2334
wenzelm@5251
  2335
* Pure: several new basic modules made available for general use, see
wenzelm@5251
  2336
also src/Pure/README;
wenzelm@5207
  2337
wenzelm@5008
  2338
* improved the theory data mechanism to support encapsulation (data
wenzelm@5008
  2339
kind name replaced by private Object.kind, acting as authorization
wenzelm@5373
  2340
key); new type-safe user interface via functor TheoryDataFun; generic
wenzelm@5373
  2341
print_data function becomes basically useless;
wenzelm@5002
  2342
wenzelm@5251
  2343
* removed global_names compatibility flag -- all theory declarations
wenzelm@5251
  2344
are qualified by default;
wenzelm@5251
  2345
wenzelm@5085
  2346
* module Pure/Syntax now offers quote / antiquote translation
wenzelm@5085
  2347
functions (useful for Hoare logic etc. with implicit dependencies);
wenzelm@5373
  2348
see HOL/ex/Antiquote for an example use;
wenzelm@5085
  2349
wenzelm@5127
  2350
* Simplifier now offers conversions (asm_)(full_)rewrite: simpset ->
wenzelm@5127
  2351
cterm -> thm;
wenzelm@5127
  2352
wenzelm@5207
  2353
* new tactical CHANGED_GOAL for checking that a tactic modifies a
wenzelm@5207
  2354
subgoal;
paulson@5142
  2355
wenzelm@5251
  2356
* Display.print_goals function moved to Locale.print_goals;
wenzelm@5251
  2357
wenzelm@5731
  2358
* standard print function for goals supports current_goals_markers
wenzelm@5731
  2359
variable for marking begin of proof, end of proof, start of goal; the
wenzelm@5731
  2360
default is ("", "", ""); setting current_goals_markers := ("<proof>",
wenzelm@5731
  2361
"</proof>", "<goal>") causes SGML like tagged proof state printing,
wenzelm@5731
  2362
for example;
wenzelm@5731
  2363
wenzelm@5002
  2364
wenzelm@5002
  2365
wenzelm@4410
  2366
New in Isabelle98 (January 1998)
wenzelm@4410
  2367
--------------------------------
wenzelm@4410
  2368
wenzelm@4410
  2369
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4410
  2370
wenzelm@4410
  2371
* changed lexical syntax of terms / types: dots made part of long
wenzelm@4410
  2372
identifiers, e.g. "%x.x" no longer possible, should be "%x. x";
wenzelm@4410
  2373
wenzelm@4410
  2374
* simpset (and claset) reference variable replaced by functions
wenzelm@4410
  2375
simpset / simpset_ref;
wenzelm@4410
  2376
wenzelm@4410
  2377
* no longer supports theory aliases (via merge) and non-trivial
wenzelm@4410
  2378
implicit merge of thms' signatures;
wenzelm@4410
  2379
wenzelm@4410
  2380
* most internal names of constants changed due to qualified names;
wenzelm@4410
  2381
wenzelm@4410
  2382
* changed Pure/Sequence interface (see Pure/seq.ML);
wenzelm@4410
  2383
wenzelm@3454
  2384
paulson@3715
  2385
*** General Changes ***
paulson@3715
  2386
wenzelm@4174
  2387
* hierachically structured name spaces (for consts, types, axms, thms
wenzelm@3943
  2388
etc.); new lexical class 'longid' (e.g. Foo.bar.x) may render much of
wenzelm@4108
  2389
old input syntactically incorrect (e.g. "%x.x"); COMPATIBILITY:
wenzelm@4108
  2390
isatool fixdots ensures space after dots (e.g. "%x. x"); set
wenzelm@4174
  2391
long_names for fully qualified output names; NOTE: ML programs
wenzelm@4174
  2392
(special tactics, packages etc.) referring to internal names may have
wenzelm@4174
  2393
to be adapted to cope with fully qualified names; in case of severe
wenzelm@4174
  2394
backward campatibility problems try setting 'global_names' at compile
wenzelm@4174
  2395
time to have enrything declared within a flat name space; one may also
wenzelm@4174
  2396
fine tune name declarations in theories via the 'global' and 'local'
wenzelm@4174
  2397
section;
wenzelm@4108
  2398
wenzelm@4108
  2399
* reimplemented the implicit simpset and claset using the new anytype
wenzelm@4108
  2400
data filed in signatures; references simpset:simpset ref etc. are
wenzelm@4108
  2401
replaced by functions simpset:unit->simpset and
wenzelm@4108
  2402
simpset_ref:unit->simpset ref; COMPATIBILITY: use isatool fixclasimp
wenzelm@4108
  2403
to patch your ML files accordingly;
paulson@3856
  2404
wenzelm@3857
  2405
* HTML output now includes theory graph data for display with Java
wenzelm@3857
  2406
applet or isatool browser; data generated automatically via isatool
wenzelm@3901
  2407
usedir (see -i option, ISABELLE_USEDIR_OPTIONS);
wenzelm@3857
  2408
paulson@3856
  2409
* defs may now be conditional; improved rewrite_goals_tac to handle
paulson@3856
  2410
conditional equations;
paulson@3856
  2411
wenzelm@4174
  2412
* defs now admits additional type arguments, using TYPE('a) syntax;
wenzelm@4174
  2413
wenzelm@3901
  2414
* theory aliases via merge (e.g. M=A+B+C) no longer supported, always
wenzelm@3901
  2415
creates a new theory node; implicit merge of thms' signatures is
wenzelm@4112
  2416
restricted to 'trivial' ones; COMPATIBILITY: one may have to use
wenzelm@3901
  2417
transfer:theory->thm->thm in (rare) cases;
wenzelm@3901
  2418
wenzelm@3968
  2419
* improved handling of draft signatures / theories; draft thms (and
wenzelm@3968
  2420
ctyps, cterms) are automatically promoted to real ones;
wenzelm@3968
  2421
wenzelm@3901
  2422
* slightly changed interfaces for oracles: admit many per theory, named
wenzelm@3901
  2423
(e.g. oracle foo = mlfun), additional name argument for invoke_oracle;
wenzelm@3901
  2424
wenzelm@3901
  2425
* print_goals: optional output of const types (set show_consts and
wenzelm@3901
  2426
show_types);
wenzelm@3851
  2427
wenzelm@4388
  2428
* improved output of warnings (###) and errors (***);
wenzelm@3697
  2429
paulson@4178
  2430
* subgoal_tac displays a warning if the new subgoal has type variables;
paulson@4178
  2431
paulson@3715
  2432
* removed old README and Makefiles;
wenzelm@3697
  2433
paulson@3856
  2434
* replaced print_goals_ref hook by print_current_goals_fn and result_error_fn;
wenzelm@3670
  2435
paulson@3715
  2436
* removed obsolete init_pps and init_database;
paulson@3715
  2437
paulson@3715
  2438
* deleted the obsolete tactical STATE, which was declared by
paulson@3715
  2439
    fun STATE tacfun st = tacfun st st;
paulson@3715
  2440
wenzelm@4388
  2441
* cd and use now support path variables, e.g. $ISABELLE_HOME, or ~
wenzelm@4388
  2442
(which abbreviates $HOME);
wenzelm@4269
  2443
wenzelm@4269
  2444
* changed Pure/Sequence interface (see Pure/seq.ML); COMPATIBILITY:
wenzelm@4269
  2445
use isatool fixseq to adapt your ML programs (this works for fully
wenzelm@4269
  2446
qualified references to the Sequence structure only!);
wenzelm@4269
  2447
wenzelm@4381
  2448
* use_thy no longer requires writable current directory; it always
wenzelm@4381
  2449
reloads .ML *and* .thy file, if either one is out of date;
wenzelm@4269
  2450
paulson@3715
  2451
paulson@3715
  2452
*** Classical Reasoner ***
paulson@3715
  2453
wenzelm@3744
  2454
* Clarify_tac, clarify_tac, clarify_step_tac, Clarify_step_tac: new
wenzelm@3744
  2455
tactics that use classical reasoning to simplify a subgoal without
wenzelm@3744
  2456
splitting it into several subgoals;
paulson@3715
  2457
paulson@3719
  2458
* Safe_tac: like safe_tac but uses the default claset;
paulson@3719
  2459
paulson@3715
  2460
paulson@3715
  2461
*** Simplifier ***
paulson@3715
  2462
paulson@3715
  2463
* added simplification meta rules:
paulson@3715
  2464
    (asm_)(full_)simplify: simpset -> thm -> thm;
paulson@3715
  2465
paulson@3715
  2466
* simplifier.ML no longer part of Pure -- has to be loaded by object
paulson@3715
  2467
logics (again);
paulson@3715
  2468
paulson@3715
  2469
* added prems argument to simplification procedures;
paulson@3715
  2470
paulson@4325
  2471
* HOL, FOL, ZF: added infix function `addsplits':
paulson@4325
  2472
  instead of `<simpset> setloop (split_tac <thms>)'
paulson@4325
  2473
  you can simply write `<simpset> addsplits <thms>'
paulson@4325
  2474
paulson@3715
  2475
paulson@3715
  2476
*** Syntax ***
paulson@3715
  2477
wenzelm@4174
  2478
* TYPE('a) syntax for type reflection terms;
wenzelm@4174
  2479
wenzelm@3985
  2480
* no longer handles consts with name "" -- declare as 'syntax' instead;
paulson@3856
  2481
paulson@3856
  2482
* pretty printer: changed order of mixfix annotation preference (again!);
wenzelm@3846
  2483
paulson@3715
  2484
* Pure: fixed idt/idts vs. pttrn/pttrns syntactic categories;
paulson@3715
  2485
paulson@3715
  2486
paulson@3715
  2487
*** HOL ***
paulson@3715
  2488
wenzelm@5726
  2489
* HOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  2490
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
  2491
nipkow@4035
  2492
* HOL/TLA: Stephan Merz's formalization of Lamport's Temporal Logic of Actions;
wenzelm@3985
  2493
wenzelm@3985
  2494
* HOL/Auth: new protocol proofs including some for the Internet
nipkow@4035
  2495
  protocol TLS;
wenzelm@3985
  2496
wenzelm@4125
  2497
* HOL/Map: new theory of `maps' a la VDM;
nipkow@3982
  2498
wenzelm@4335
  2499
* HOL/simplifier: simplification procedures nat_cancel_sums for
wenzelm@4335
  2500
cancelling out common nat summands from =, <, <= (in)equalities, or
wenzelm@4335
  2501
differences; simplification procedures nat_cancel_factor for
wenzelm@4335
  2502
cancelling common factor from =, <, <= (in)equalities over natural
wenzelm@4373
  2503
sums; nat_cancel contains both kinds of procedures, it is installed by
wenzelm@4373
  2504
default in Arith.thy -- this COULD MAKE EXISTING PROOFS FAIL;
wenzelm@4335
  2505
nipkow@3580
  2506
* HOL/simplifier: terms of the form
paulson@4325
  2507
  `? x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x)'  (or t=x)
nipkow@3580
  2508
  are rewritten to
nipkow@4035
  2509
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t)',
nipkow@4035
  2510
  and those of the form
paulson@4325
  2511
  `! x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x) --> R(x)'  (or t=x)
nipkow@4035
  2512
  are rewritten to
nipkow@4035
  2513
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t) --> R(t)',
nipkow@4035
  2514
nipkow@4035
  2515
* HOL/datatype
nipkow@4035
  2516
  Each datatype `t' now comes with a theorem `split_t_case' of the form
nipkow@3580
  2517
nipkow@4035
  2518
  P(t_case f1 ... fn x) =
nipkow@4035
  2519
     ( (!y1 ... ym1. x = C1 y1 ... ym1 --> P(f1 y1 ... ym1)) &
nipkow@4035
  2520
        ...
oheimb@4189
  2521
       (!y1 ... ymn. x = Cn y1 ... ymn --> P(f1 y1 ... ymn))
nipkow@4035
  2522
     )
nipkow@4035
  2523
oheimb@4930
  2524
  and a theorem `split_t_case_asm' of the form
oheimb@4189
  2525
oheimb@4189
  2526
  P(t_case f1 ... fn x) =
oheimb@4189
  2527
    ~( (? y1 ... ym1. x = C1 y1 ... ym1 & ~P(f1 y1 ... ym1)) |
oheimb@4189
  2528
        ...
oheimb@4189
  2529
       (? y1 ... ymn. x = Cn y1 ... ymn & ~P(f1 y1 ... ymn))
oheimb@4189
  2530
     )
oheimb@4930
  2531
  which can be added to a simpset via `addsplits'. The existing theorems
oheimb@4930
  2532
  expand_list_case and expand_option_case have been renamed to
oheimb@4930
  2533
  split_list_case and split_option_case.
oheimb@4189
  2534
nipkow@4361
  2535
* HOL/Arithmetic:
nipkow@4361
  2536
  - `pred n' is automatically converted to `n-1'.
nipkow@4361
  2537
    Users are strongly encouraged not to use `pred' any longer,
nipkow@4361
  2538
    because it will disappear altogether at some point.
nipkow@4361
  2539
  - Users are strongly encouraged to write "0 < n" rather than
nipkow@4361
  2540
    "n ~= 0". Theorems and proof tools have been modified towards this
nipkow@4361
  2541
    `standard'.
nipkow@4357
  2542
nipkow@4502
  2543
* HOL/Lists:
nipkow@4502
  2544
  the function "set_of_list" has been renamed "set" (and its theorems too);
nipkow@4502
  2545
  the function "nth" now takes its arguments in the reverse order and
nipkow@4502
  2546
  has acquired the infix notation "!" as in "xs!n".
paulson@3570
  2547
paulson@4154
  2548
* HOL/Set: UNIV is now a constant and is no longer translated to Compl{};
paulson@4154
  2549
paulson@4154
  2550
* HOL/Set: The operator (UN x.B x) now abbreviates (UN x:UNIV. B x) and its
paulson@4154
  2551
  specialist theorems (like UN1_I) are gone.  Similarly for (INT x.B x);
paulson@4154
  2552
wenzelm@4575
  2553
* HOL/record: extensible records with schematic structural subtyping
wenzelm@4575
  2554
(single inheritance); EXPERIMENTAL version demonstrating the encoding,
wenzelm@4575
  2555
still lacks various theorems and concrete record syntax;
wenzelm@4575
  2556
wenzelm@4125
  2557
paulson@3715
  2558
*** HOLCF ***
wenzelm@3535
  2559
wenzelm@4125
  2560
* removed "axioms" and "generated by" sections;
wenzelm@4125
  2561
oheimb@4123
  2562
* replaced "ops" section by extended "consts" section, which is capable of
wenzelm@4125
  2563
  handling the continuous function space "->" directly;
wenzelm@4125
  2564
wenzelm@4125
  2565
* domain package:
wenzelm@4125
  2566
  . proves theorems immediately and stores them in the theory,
wenzelm@4125
  2567
  . creates hierachical name space,
wenzelm@4125
  2568
  . now uses normal mixfix annotations (instead of cinfix...),
wenzelm@4125
  2569
  . minor changes to some names and values (for consistency),
wenzelm@4125
  2570
  . e.g. cases -> casedist, dists_eq -> dist_eqs, [take_lemma] -> take_lemmas,
wenzelm@4125
  2571
  . separator between mutual domain defs: changed "," to "and",
wenzelm@4125
  2572
  . improved handling of sort constraints;  now they have to
wenzelm@4125
  2573
    appear on the left-hand side of the equations only;
oheimb@4123
  2574
oheimb@4123
  2575
* fixed LAM <x,y,zs>.b syntax;
wenzelm@3567
  2576
wenzelm@3744
  2577
* added extended adm_tac to simplifier in HOLCF -- can now discharge
wenzelm@3744
  2578
adm (%x. P (t x)), where P is chainfinite and t continuous;
wenzelm@3579
  2579
wenzelm@3579
  2580
paulson@3719
  2581
*** FOL and ZF ***
paulson@3719
  2582
wenzelm@5726
  2583
* FOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  2584
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
  2585
wenzelm@3744
  2586
* qed_spec_mp, qed_goal_spec_mp, qed_goalw_spec_mp are available, as
wenzelm@3744
  2587
in HOL, they strip ALL and --> from proved theorems;
wenzelm@3744
  2588
paulson@3719
  2589
wenzelm@3579
  2590
wenzelm@3006
  2591
New in Isabelle94-8 (May 1997)
wenzelm@3006
  2592
------------------------------
wenzelm@2654
  2593
paulson@3002
  2594
*** General Changes ***
paulson@3002
  2595
paulson@3002
  2596
* new utilities to build / run / maintain Isabelle etc. (in parts
paulson@3002
  2597
still somewhat experimental); old Makefiles etc. still functional;
wenzelm@2971
  2598
wenzelm@3205
  2599
* new 'Isabelle System Manual';
wenzelm@3205
  2600
wenzelm@2825
  2601
* INSTALL text, together with ./configure and ./build scripts;
wenzelm@2773
  2602
wenzelm@3006
  2603
* reimplemented type inference for greater efficiency, better error
wenzelm@3006
  2604
messages and clean internal interface;
paulson@3002
  2605
paulson@3002
  2606
* prlim command for dealing with lots of subgoals (an easier way of
paulson@3002
  2607
setting goals_limit);
paulson@3002
  2608
wenzelm@3006
  2609
wenzelm@3006
  2610
*** Syntax ***
paulson@3002
  2611
wenzelm@3116
  2612
* supports alternative (named) syntax tables (parser and pretty
wenzelm@3116
  2613
printer); internal interface is provided by add_modesyntax(_i);
wenzelm@3116
  2614
paulson@3002
  2615
* Pure, FOL, ZF, HOL, HOLCF now support symbolic input and output; to
paulson@3002
  2616
be used in conjunction with the Isabelle symbol font; uses the
paulson@3002
  2617
"symbols" syntax table;
paulson@3002
  2618
wenzelm@2705
  2619
* added token_translation interface (may translate name tokens in
wenzelm@2756
  2620
arbitrary ways, dependent on their type (free, bound, tfree, ...) and
wenzelm@3116
  2621
the current print_mode); IMPORTANT: user print translation functions
wenzelm@3116
  2622
are responsible for marking newly introduced bounds
wenzelm@3116
  2623
(Syntax.mark_boundT);
wenzelm@2705
  2624
wenzelm@2730
  2625
* token translations for modes "xterm" and "xterm_color" that display
wenzelm@3006
  2626
names in bold, underline etc. or colors (which requires a color
wenzelm@3006
  2627
version of xterm);
wenzelm@2730
  2628
paulson@3002
  2629
* infixes may now be declared with names independent of their syntax;
paulson@3002
  2630
paulson@3002
  2631
* added typed_print_translation (like print_translation, but may
paulson@3002
  2632
access type of constant);
paulson@3002
  2633
wenzelm@3006
  2634
paulson@3002
  2635
*** Classical Reasoner ***
paulson@3002
  2636
paulson@3002
  2637
Blast_tac: a new tactic!  It is often more powerful than fast_tac, but has
paulson@3002
  2638
some limitations.  Blast_tac...
paulson@3002
  2639
  + ignores addss, addbefore, addafter; this restriction is intrinsic
paulson@3002
  2640
  + ignores elimination rules that don't have the correct format
wenzelm@5726
  2641
        (the conclusion MUST be a formula variable)