NEWS

echo prover input via raw_messages, for improved protocol tracing;

Isabelle NEWS -- history user-relevant changes
==============================================

New in this Isabelle version
----------------------------

*** General ***

* Theory loader: source files are identified by content via SHA1
digests.  Discontinued former path/modtime identification and optional
ISABELLE_FILE_IDENT plugin scripts.

* Parallelization of nested Isar proofs is subject to
Goal.parallel_proofs_threshold (default 100).  See also isabelle
usedir option -Q.

* Discontinued support for Poly/ML 5.2, which was the last version
without proper multithreading and TimeLimit implementation.

* Discontinued old lib/scripts/polyml-platform, which has been
obsolete since Isabelle2009-2.

* Theory loader: source files are exclusively located via the master
directory of each theory node (where the .thy file itself resides).
The global load path (such as src/HOL/Library) has been discontinued.
Note that the path element ~~ may be used to reference theories in the
Isabelle home folder -- for instance, "~~/src/HOL/Library/FuncSet".
INCOMPATIBILITY.

* Various optional external tools are referenced more robustly and
uniformly by explicit Isabelle settings as follows:

  ISABELLE_CSDP   (formerly CSDP_EXE)
  ISABELLE_GHC    (formerly EXEC_GHC or GHC_PATH)
  ISABELLE_OCAML  (formerly EXEC_OCAML)
  ISABELLE_SWIPL  (formerly EXEC_SWIPL)
  ISABELLE_YAP    (formerly EXEC_YAP)

Note that automated detection from the file-system or search path has
been discontinued.  INCOMPATIBILITY.

* Name space: former unsynchronized references are now proper
configuration options, with more conventional names:

  long_names   ~> names_long
  short_names  ~> names_short
  unique_names ~> names_unique

Minor INCOMPATIBILITY, need to declare options in context like this:

  declare [[names_unique = false]]

* Literal facts `prop` may contain dummy patterns, e.g. `_ = _`.  Note
that the result needs to be unique, which means fact specifications
may have to be refined after enriching a proof context.

* Isabelle/Isar reference manual provides more formal references in
syntax diagrams.


*** HOL ***

* Finite_Set.thy: more coherent development of fold_set locales:

    locale fun_left_comm ~> locale comp_fun_commute
    locale fun_left_comm_idem ~> locale comp_fun_idem
    
Both use point-free characterisation; interpretation proofs may need adjustment.
INCOMPATIBILITY.

* Code generation:
  - theory Library/Code_Char_ord provides native ordering of characters
    in the target language.
    
* Declare ext [intro] by default.  Rare INCOMPATIBILITY.

* Nitpick:
  - Added "need" and "total_consts" options.
  - Reintroduced "show_skolems" option by popular demand.
  - Renamed attribute: nitpick_def ~> nitpick_unfold.
    INCOMPATIBILITY.

* Sledgehammer:
  - sledgehammer available_provers ~> sledgehammer supported_provers.
    INCOMPATIBILITY.
  - Added support for SNARK and ToFoF-E on SystemOnTPTP and for simply typed
    TPTP problems (TFF).
  - Added "preplay_timeout", "slicing", "type_enc", "sound", "max_mono_iters",
    and "max_new_mono_instances" options.
  - Removed "explicit_apply" and "full_types" options as well as "Full Types"
    Proof General menu item. INCOMPATIBILITY.

* Metis:
  - Removed "metisF" -- use "metis" instead. INCOMPATIBILITY.
  - Obsoleted "metisFT" -- use "metis (full_types)" instead. INCOMPATIBILITY.

* "try":
  - Renamed "try_methods" and added "simp:", "intro:", "dest:", and "elim:"
    options. INCOMPATIBILITY.
  - Introduced "try" that not only runs "try_methods" but also "solve_direct",
    "sledgehammer", "quickcheck", and "nitpick".

* Quickcheck:
  - Added "eval" option to evaluate terms for the found counterexample
    (currently only supported by the default (exhaustive) tester)
  - Added post-processing of terms to obtain readable counterexamples
    (currently only supported by the default (exhaustive) tester)
  - New counterexample generator quickcheck[narrowing] enables
    narrowing-based testing.
    It requires that the Glasgow Haskell compiler is installed and
    its location is known to Isabelle with the environment variable
    ISABELLE_GHC.

* Function package: discontinued option "tailrec".
INCOMPATIBILITY. Use partial_function instead.

* HOL-Probability:
  - Caratheodory's extension lemma is now proved for ring_of_sets.
  - Infinite products of probability measures are now available.
  - Use extended reals instead of positive extended reals.
    INCOMPATIBILITY.


*** Document preparation ***

* Discontinued special treatment of hard tabulators, which are better
avoided in the first place.  Implicit tab-width is 1.

* Antiquotation @{rail} layouts railroad syntax diagrams, see also
isar-ref manual.

* Antiquotation @{value} evaluates the given term and presents its result.

* Localized \isabellestyle switch can be used within blocks or groups
like this:

  \isabellestyle{it}  %preferred default
  {\isabellestylett @{text "typewriter stuff"}}

* New term style "isub" as ad-hoc conversion of variables x1, y23 into
subscripted form x\<^isub>1, y\<^isub>2\<^isub>3.

* Predefined LaTeX macros for Isabelle symbols \<bind> and \<then>
(e.g. see ~~/src/HOL/Library/Monad_Syntax.thy).


*** ML ***

* Antiquotations for ML and document preparation are managed as theory
data, which requires explicit setup.

* Isabelle_Process.is_active allows tools to check if the official
process wrapper is running (Isabelle/Scala/jEdit) or the old TTY loop
(better known as Proof General).

* Structure Proof_Context follows standard naming scheme.  Old
ProofContext is still available for some time as legacy alias.

* Structure Timing provides various operations for timing; supersedes
former start_timing/end_timing etc.

* Path.print is the official way to show file-system paths to users
(including quotes etc.).

* Inner syntax: identifiers in parse trees of generic categories
"logic", "aprop", "idt" etc. carry position information (disguised as
type constraints).  Occasional INCOMPATIBILITY with non-compliant
translations that choke on unexpected type constraints.  Positions can
be stripped in ML translations via Syntax.strip_positions /
Syntax.strip_positions_ast, or via the syntax constant
"_strip_positions" within parse trees.  As last resort, positions can
be disabled via the configuration option Syntax.positions, which is
called "syntax_positions" in Isar attribute syntax.

* Discontinued special status of various ML structures that contribute
to structure Syntax (Ast, Lexicon, Mixfix, Parser, Printer etc.): less
pervasive content, no inclusion in structure Syntax.  INCOMPATIBILITY,
refer directly to Ast.Constant, Lexicon.is_identifier,
Syntax_Trans.mk_binder_tr etc.

* Typed print translation: discontinued show_sorts argument, which is
already available via context of "advanced" translation.

* Refined PARALLEL_GOALS tactical: degrades gracefully for schematic
goal states; body tactic needs to address all subgoals uniformly.

* Slightly more special eq_list/eq_set, with shortcut involving
pointer equality (assumes that eq relation is reflexive).

* Classical tactics use proper Proof.context instead of historic types
claset/clasimpset.  Old-style declarations like addIs, addEs, addDs
operate directly on Proof.context.  Raw type claset retains its use as
snapshot of the classical context, which can be recovered via
(put_claset HOL_cs) etc.  Type clasimpset has been discontinued.
INCOMPATIBILITY, classical tactics and derived proof methods require
proper Proof.context.



New in Isabelle2011 (January 2011)
----------------------------------

*** General ***

* Experimental Prover IDE based on Isabelle/Scala and jEdit (see
src/Tools/jEdit).  This also serves as IDE for Isabelle/ML, with
useful tooltips and hyperlinks produced from its static analysis.  The
bundled component provides an executable Isabelle tool that can be run
like this:

  Isabelle2011/bin/isabelle jedit

* Significantly improved Isabelle/Isar implementation manual.

* System settings: ISABELLE_HOME_USER now includes ISABELLE_IDENTIFIER
(and thus refers to something like $HOME/.isabelle/Isabelle2011),
while the default heap location within that directory lacks that extra
suffix.  This isolates multiple Isabelle installations from each
other, avoiding problems with old settings in new versions.
INCOMPATIBILITY, need to copy/upgrade old user settings manually.

* Source files are always encoded as UTF-8, instead of old-fashioned
ISO-Latin-1.  INCOMPATIBILITY.  Isabelle LaTeX documents might require
the following package declarations:

  \usepackage[utf8]{inputenc}
  \usepackage{textcomp}

* Explicit treatment of UTF-8 sequences as Isabelle symbols, such that
a Unicode character is treated as a single symbol, not a sequence of
non-ASCII bytes as before.  Since Isabelle/ML string literals may
contain symbols without further backslash escapes, Unicode can now be
used here as well.  Recall that Symbol.explode in ML provides a
consistent view on symbols, while raw explode (or String.explode)
merely give a byte-oriented representation.

* Theory loader: source files are primarily located via the master
directory of each theory node (where the .thy file itself resides).
The global load path is still partially available as legacy feature.
Minor INCOMPATIBILITY due to subtle change in file lookup: use
explicit paths, relatively to the theory.

* Special treatment of ML file names has been discontinued.
Historically, optional extensions .ML or .sml were added on demand --
at the cost of clarity of file dependencies.  Recall that Isabelle/ML
files exclusively use the .ML extension.  Minor INCOMPATIBILTY.

* Various options that affect pretty printing etc. are now properly
handled within the context via configuration options, instead of
unsynchronized references or print modes.  There are both ML Config.T
entities and Isar declaration attributes to access these.

  ML (Config.T)                 Isar (attribute)

  eta_contract                  eta_contract
  show_brackets                 show_brackets
  show_sorts                    show_sorts
  show_types                    show_types
  show_question_marks           show_question_marks
  show_consts                   show_consts
  show_abbrevs                  show_abbrevs

  Syntax.ast_trace              syntax_ast_trace
  Syntax.ast_stat               syntax_ast_stat
  Syntax.ambiguity_level        syntax_ambiguity_level

  Goal_Display.goals_limit      goals_limit
  Goal_Display.show_main_goal   show_main_goal

  Method.rule_trace             rule_trace

  Thy_Output.display            thy_output_display
  Thy_Output.quotes             thy_output_quotes
  Thy_Output.indent             thy_output_indent
  Thy_Output.source             thy_output_source
  Thy_Output.break              thy_output_break

Note that corresponding "..._default" references in ML may only be
changed globally at the ROOT session setup, but *not* within a theory.
The option "show_abbrevs" supersedes the former print mode
"no_abbrevs" with inverted meaning.

* More systematic naming of some configuration options.
INCOMPATIBILITY.

  trace_simp  ~>  simp_trace
  debug_simp  ~>  simp_debug

* Support for real valued configuration options, using simplistic
floating-point notation that coincides with the inner syntax for
float_token.

* Support for real valued preferences (with approximative PGIP type):
front-ends need to accept "pgint" values in float notation.
INCOMPATIBILITY.

* The IsabelleText font now includes Cyrillic, Hebrew, Arabic from
DejaVu Sans.

* Discontinued support for Poly/ML 5.0 and 5.1 versions.


*** Pure ***

* Command 'type_synonym' (with single argument) replaces somewhat
outdated 'types', which is still available as legacy feature for some
time.

* Command 'nonterminal' (with 'and' separated list of arguments)
replaces somewhat outdated 'nonterminals'.  INCOMPATIBILITY.

* Command 'notepad' replaces former 'example_proof' for
experimentation in Isar without any result.  INCOMPATIBILITY.

* Locale interpretation commands 'interpret' and 'sublocale' accept
lists of equations to map definitions in a locale to appropriate
entities in the context of the interpretation.  The 'interpretation'
command already provided this functionality.

* Diagnostic command 'print_dependencies' prints the locale instances
that would be activated if the specified expression was interpreted in
the current context.  Variant "print_dependencies!" assumes a context
without interpretations.

* Diagnostic command 'print_interps' prints interpretations in proofs
in addition to interpretations in theories.

* Discontinued obsolete 'global' and 'local' commands to manipulate
the theory name space.  Rare INCOMPATIBILITY.  The ML functions
Sign.root_path and Sign.local_path may be applied directly where this
feature is still required for historical reasons.

* Discontinued obsolete 'constdefs' command.  INCOMPATIBILITY, use
'definition' instead.

* The "prems" fact, which refers to the accidental collection of
foundational premises in the context, is now explicitly marked as
legacy feature and will be discontinued soon.  Consider using "assms"
of the head statement or reference facts by explicit names.

* Document antiquotations @{class} and @{type} print classes and type
constructors.

* Document antiquotation @{file} checks file/directory entries within
the local file system.


*** HOL ***

* Coercive subtyping: functions can be declared as coercions and type
inference will add them as necessary upon input of a term.  Theory
Complex_Main declares real :: nat => real and real :: int => real as
coercions. A coercion function f is declared like this:

  declare [[coercion f]]

To lift coercions through type constructors (e.g. from nat => real to
nat list => real list), map functions can be declared, e.g.

  declare [[coercion_map map]]

Currently coercion inference is activated only in theories including
real numbers, i.e. descendants of Complex_Main.  This is controlled by
the configuration option "coercion_enabled", e.g. it can be enabled in
other theories like this:

  declare [[coercion_enabled]]

* Command 'partial_function' provides basic support for recursive
function definitions over complete partial orders.  Concrete instances
are provided for i) the option type, ii) tail recursion on arbitrary
types, and iii) the heap monad of Imperative_HOL.  See
src/HOL/ex/Fundefs.thy and src/HOL/Imperative_HOL/ex/Linked_Lists.thy
for examples.

* Function package: f.psimps rules are no longer implicitly declared
as [simp].  INCOMPATIBILITY.

* Datatype package: theorems generated for executable equality (class
"eq") carry proper names and are treated as default code equations.

* Inductive package: now offers command 'inductive_simps' to
automatically derive instantiated and simplified equations for
inductive predicates, similar to 'inductive_cases'.

* Command 'enriched_type' allows to register properties of the
functorial structure of types.

* Improved infrastructure for term evaluation using code generator
techniques, in particular static evaluation conversions.

* Code generator: Scala (2.8 or higher) has been added to the target
languages.

* Code generator: globbing constant expressions "*" and "Theory.*"
have been replaced by the more idiomatic "_" and "Theory._".
INCOMPATIBILITY.

* Code generator: export_code without explicit file declaration prints
to standard output.  INCOMPATIBILITY.

* Code generator: do not print function definitions for case
combinators any longer.

* Code generator: simplification with rules determined with
src/Tools/Code/code_simp.ML and method "code_simp".

* Code generator for records: more idiomatic representation of record
types.  Warning: records are not covered by ancient SML code
generation any longer.  INCOMPATIBILITY.  In cases of need, a suitable
rep_datatype declaration helps to succeed then:

  record 'a foo = ...
  ...
  rep_datatype foo_ext ...

* Records: logical foundation type for records does not carry a
'_type' suffix any longer (obsolete due to authentic syntax).
INCOMPATIBILITY.

* Quickcheck now by default uses exhaustive testing instead of random
testing.  Random testing can be invoked by "quickcheck [random]",
exhaustive testing by "quickcheck [exhaustive]".

* Quickcheck instantiates polymorphic types with small finite
datatypes by default. This enables a simple execution mechanism to
handle quantifiers and function equality over the finite datatypes.

* Quickcheck random generator has been renamed from "code" to
"random".  INCOMPATIBILITY.

* Quickcheck now has a configurable time limit which is set to 30
seconds by default. This can be changed by adding [timeout = n] to the
quickcheck command. The time limit for Auto Quickcheck is still set
independently.

* Quickcheck in locales considers interpretations of that locale for
counter example search.

* Sledgehammer:
  - Added "smt" and "remote_smt" provers based on the "smt" proof
    method. See the Sledgehammer manual for details ("isabelle doc
    sledgehammer").
  - Renamed commands:
    sledgehammer atp_info ~> sledgehammer running_provers
    sledgehammer atp_kill ~> sledgehammer kill_provers
    sledgehammer available_atps ~> sledgehammer available_provers
    INCOMPATIBILITY.
  - Renamed options:
    sledgehammer [atps = ...] ~> sledgehammer [provers = ...]
    sledgehammer [atp = ...] ~> sledgehammer [prover = ...]
    sledgehammer [timeout = 77 s] ~> sledgehammer [timeout = 77]
    (and "ms" and "min" are no longer supported)
    INCOMPATIBILITY.

* Nitpick:
  - Renamed options:
    nitpick [timeout = 77 s] ~> nitpick [timeout = 77]
    nitpick [tac_timeout = 777 ms] ~> nitpick [tac_timeout = 0.777]
    INCOMPATIBILITY.
  - Added support for partial quotient types.
  - Added local versions of the "Nitpick.register_xxx" functions.
  - Added "whack" option.
  - Allow registration of quotient types as codatatypes.
  - Improved "merge_type_vars" option to merge more types.
  - Removed unsound "fast_descrs" option.
  - Added custom symmetry breaking for datatypes, making it possible to reach
    higher cardinalities.
  - Prevent the expansion of too large definitions.

* Proof methods "metis" and "meson" now have configuration options
"meson_trace", "metis_trace", and "metis_verbose" that can be enabled
to diagnose these tools. E.g.

    using [[metis_trace = true]]

* Auto Solve: Renamed "Auto Solve Direct".  The tool is now available
manually as command 'solve_direct'.

* The default SMT solver Z3 must be enabled explicitly (due to
licensing issues) by setting the environment variable
Z3_NON_COMMERCIAL in etc/settings of the component, for example.  For
commercial applications, the SMT solver CVC3 is provided as fall-back;
changing the SMT solver is done via the configuration option
"smt_solver".

* Remote SMT solvers need to be referred to by the "remote_" prefix,
i.e. "remote_cvc3" and "remote_z3".

* Added basic SMT support for datatypes, records, and typedefs using
the oracle mode (no proofs).  Direct support of pairs has been dropped
in exchange (pass theorems fst_conv snd_conv pair_collapse to the SMT
support for a similar behavior).  Minor INCOMPATIBILITY.

* Changed SMT configuration options:
  - Renamed:
    z3_proofs ~> smt_oracle (with inverted meaning)
    z3_trace_assms ~> smt_trace_used_facts
    INCOMPATIBILITY.
  - Added:
    smt_verbose
    smt_random_seed
    smt_datatypes
    smt_infer_triggers
    smt_monomorph_limit
    cvc3_options
    remote_cvc3_options
    remote_z3_options
    yices_options

* Boogie output files (.b2i files) need to be declared in the theory
header.

* Simplification procedure "list_to_set_comprehension" rewrites list
comprehensions applied to List.set to set comprehensions.  Occasional
INCOMPATIBILITY, may be deactivated like this:

  declare [[simproc del: list_to_set_comprehension]]

* Removed old version of primrec package.  INCOMPATIBILITY.

* Removed simplifier congruence rule of "prod_case", as has for long
been the case with "split".  INCOMPATIBILITY.

* String.literal is a type, but not a datatype.  INCOMPATIBILITY.

* Removed [split_format ... and ... and ...] version of
[split_format].  Potential INCOMPATIBILITY.

* Predicate "sorted" now defined inductively, with nice induction
rules.  INCOMPATIBILITY: former sorted.simps now named sorted_simps.

* Constant "contents" renamed to "the_elem", to free the generic name
contents for other uses.  INCOMPATIBILITY.

* Renamed class eq and constant eq (for code generation) to class
equal and constant equal, plus renaming of related facts and various
tuning.  INCOMPATIBILITY.

* Dropped type classes mult_mono and mult_mono1.  INCOMPATIBILITY.

* Removed output syntax "'a ~=> 'b" for "'a => 'b option".
INCOMPATIBILITY.

* Renamed theory Fset to Cset, type Fset.fset to Cset.set, in order to
avoid confusion with finite sets.  INCOMPATIBILITY.

* Abandoned locales equiv, congruent and congruent2 for equivalence
relations.  INCOMPATIBILITY: use equivI rather than equiv_intro (same
for congruent(2)).

* Some previously unqualified names have been qualified:

  types
    bool ~> HOL.bool
    nat ~> Nat.nat

  constants
    Trueprop ~> HOL.Trueprop
    True ~> HOL.True
    False ~> HOL.False
    op & ~> HOL.conj
    op | ~> HOL.disj
    op --> ~> HOL.implies
    op = ~> HOL.eq
    Not ~> HOL.Not
    The ~> HOL.The
    All ~> HOL.All
    Ex ~> HOL.Ex
    Ex1 ~> HOL.Ex1
    Let ~> HOL.Let
    If ~> HOL.If
    Ball ~> Set.Ball
    Bex ~> Set.Bex
    Suc ~> Nat.Suc
    Pair ~> Product_Type.Pair
    fst ~> Product_Type.fst
    snd ~> Product_Type.snd
    curry ~> Product_Type.curry
    op : ~> Set.member
    Collect ~> Set.Collect

INCOMPATIBILITY.

* More canonical naming convention for some fundamental definitions:

    bot_bool_eq ~> bot_bool_def
    top_bool_eq ~> top_bool_def
    inf_bool_eq ~> inf_bool_def
    sup_bool_eq ~> sup_bool_def
    bot_fun_eq  ~> bot_fun_def
    top_fun_eq  ~> top_fun_def
    inf_fun_eq  ~> inf_fun_def
    sup_fun_eq  ~> sup_fun_def

INCOMPATIBILITY.

* More stylized fact names:

  expand_fun_eq ~> fun_eq_iff
  expand_set_eq ~> set_eq_iff
  set_ext       ~> set_eqI
  nat_number    ~> eval_nat_numeral

INCOMPATIBILITY.

* Refactoring of code-generation specific operations in theory List:

  constants
    null ~> List.null

  facts
    mem_iff ~> member_def
    null_empty ~> null_def

INCOMPATIBILITY.  Note that these were not supposed to be used
regularly unless for striking reasons; their main purpose was code
generation.

Various operations from the Haskell prelude are used for generating
Haskell code.

* Term "bij f" is now an abbreviation of "bij_betw f UNIV UNIV".  Term
"surj f" is now an abbreviation of "range f = UNIV".  The theorems
bij_def and surj_def are unchanged.  INCOMPATIBILITY.

* Abolished some non-alphabetic type names: "prod" and "sum" replace
"*" and "+" respectively.  INCOMPATIBILITY.

* Name "Plus" of disjoint sum operator "<+>" is now hidden.  Write
"Sum_Type.Plus" instead.

* Constant "split" has been merged with constant "prod_case"; names of
ML functions, facts etc. involving split have been retained so far,
though.  INCOMPATIBILITY.

* Dropped old infix syntax "_ mem _" for List.member; use "_ : set _"
instead.  INCOMPATIBILITY.

* Removed lemma "Option.is_none_none" which duplicates "is_none_def".
INCOMPATIBILITY.

* Former theory Library/Enum is now part of the HOL-Main image.
INCOMPATIBILITY: all constants of the Enum theory now have to be
referred to by its qualified name.

  enum    ~>  Enum.enum
  nlists  ~>  Enum.nlists
  product ~>  Enum.product

* Theory Library/Monad_Syntax provides do-syntax for monad types.
Syntax in Library/State_Monad has been changed to avoid ambiguities.
INCOMPATIBILITY.

* Theory Library/SetsAndFunctions has been split into
Library/Function_Algebras and Library/Set_Algebras; canonical names
for instance definitions for functions; various improvements.
INCOMPATIBILITY.

* Theory Library/Multiset provides stable quicksort implementation of
sort_key.

* Theory Library/Multiset: renamed empty_idemp ~> empty_neutral.
INCOMPATIBILITY.

* Session Multivariate_Analysis: introduced a type class for euclidean
space.  Most theorems are now stated in terms of euclidean spaces
instead of finite cartesian products.

  types
    real ^ 'n ~>  'a::real_vector
              ~>  'a::euclidean_space
              ~>  'a::ordered_euclidean_space
        (depends on your needs)

  constants
     _ $ _        ~> _ $$ _
     \<chi> x. _  ~> \<chi>\<chi> x. _
     CARD('n)     ~> DIM('a)

Also note that the indices are now natural numbers and not from some
finite type. Finite cartesian products of euclidean spaces, products
of euclidean spaces the real and complex numbers are instantiated to
be euclidean_spaces.  INCOMPATIBILITY.

* Session Probability: introduced pextreal as positive extended real
numbers.  Use pextreal as value for measures.  Introduce the
Radon-Nikodym derivative, product spaces and Fubini's theorem for
arbitrary sigma finite measures.  Introduces Lebesgue measure based on
the integral in Multivariate Analysis.  INCOMPATIBILITY.

* Session Imperative_HOL: revamped, corrected dozens of inadequacies.
INCOMPATIBILITY.

* Session SPARK (with image HOL-SPARK) provides commands to load and
prove verification conditions generated by the SPARK Ada program
verifier.  See also src/HOL/SPARK and src/HOL/SPARK/Examples.


*** HOL-Algebra ***

* Theorems for additive ring operations (locale abelian_monoid and
descendants) are generated by interpretation from their multiplicative
counterparts.  Names (in particular theorem names) have the mandatory
qualifier 'add'.  Previous theorem names are redeclared for
compatibility.

* Structure "int_ring" is now an abbreviation (previously a
definition).  This fits more natural with advanced interpretations.


*** HOLCF ***

* The domain package now runs in definitional mode by default: The
former command 'new_domain' is now called 'domain'.  To use the domain
package in its original axiomatic mode, use 'domain (unsafe)'.
INCOMPATIBILITY.

* The new class "domain" is now the default sort.  Class "predomain"
is an unpointed version of "domain". Theories can be updated by
replacing sort annotations as shown below.  INCOMPATIBILITY.

  'a::type ~> 'a::countable
  'a::cpo  ~> 'a::predomain
  'a::pcpo ~> 'a::domain

* The old type class "rep" has been superseded by class "domain".
Accordingly, users of the definitional package must remove any
"default_sort rep" declarations.  INCOMPATIBILITY.

* The domain package (definitional mode) now supports unpointed
predomain argument types, as long as they are marked 'lazy'. (Strict
arguments must be in class "domain".) For example, the following
domain definition now works:

  domain natlist = nil | cons (lazy "nat discr") (lazy "natlist")

* Theory HOLCF/Library/HOL_Cpo provides cpo and predomain class
instances for types from main HOL: bool, nat, int, char, 'a + 'b,
'a option, and 'a list.  Additionally, it configures fixrec and the
domain package to work with these types.  For example:

  fixrec isInl :: "('a + 'b) u -> tr"
    where "isInl$(up$(Inl x)) = TT" | "isInl$(up$(Inr y)) = FF"

  domain V = VFun (lazy "V -> V") | VCon (lazy "nat") (lazy "V list")

* The "(permissive)" option of fixrec has been replaced with a
per-equation "(unchecked)" option. See
src/HOL/HOLCF/Tutorial/Fixrec_ex.thy for examples. INCOMPATIBILITY.

* The "bifinite" class no longer fixes a constant "approx"; the class
now just asserts that such a function exists.  INCOMPATIBILITY.

* Former type "alg_defl" has been renamed to "defl".  HOLCF no longer
defines an embedding of type 'a defl into udom by default; instances
of "bifinite" and "domain" classes are available in
src/HOL/HOLCF/Library/Defl_Bifinite.thy.

* The syntax "REP('a)" has been replaced with "DEFL('a)".

* The predicate "directed" has been removed.  INCOMPATIBILITY.

* The type class "finite_po" has been removed.  INCOMPATIBILITY.

* The function "cprod_map" has been renamed to "prod_map".
INCOMPATIBILITY.

* The monadic bind operator on each powerdomain has new binder syntax
similar to sets, e.g. "\<Union>\<sharp>x\<in>xs. t" represents
"upper_bind\<cdot>xs\<cdot>(\<Lambda> x. t)".

* The infix syntax for binary union on each powerdomain has changed
from e.g. "+\<sharp>" to "\<union>\<sharp>", for consistency with set
syntax.  INCOMPATIBILITY.

* The constant "UU" has been renamed to "bottom".  The syntax "UU" is
still supported as an input translation.

* Renamed some theorems (the original names are also still available).

  expand_fun_below   ~> fun_below_iff
  below_fun_ext      ~> fun_belowI
  expand_cfun_eq     ~> cfun_eq_iff
  ext_cfun           ~> cfun_eqI
  expand_cfun_below  ~> cfun_below_iff
  below_cfun_ext     ~> cfun_belowI
  cont2cont_Rep_CFun ~> cont2cont_APP

* The Abs and Rep functions for various types have changed names.
Related theorem names have also changed to match. INCOMPATIBILITY.

  Rep_CFun  ~> Rep_cfun
  Abs_CFun  ~> Abs_cfun
  Rep_Sprod ~> Rep_sprod
  Abs_Sprod ~> Abs_sprod
  Rep_Ssum  ~> Rep_ssum
  Abs_Ssum  ~> Abs_ssum

* Lemmas with names of the form *_defined_iff or *_strict_iff have
been renamed to *_bottom_iff.  INCOMPATIBILITY.

* Various changes to bisimulation/coinduction with domain package:

  - Definitions of "bisim" constants no longer mention definedness.
  - With mutual recursion, "bisim" predicate is now curried.
  - With mutual recursion, each type gets a separate coind theorem.
  - Variable names in bisim_def and coinduct rules have changed.

INCOMPATIBILITY.

* Case combinators generated by the domain package for type "foo" are
now named "foo_case" instead of "foo_when".  INCOMPATIBILITY.

* Several theorems have been renamed to more accurately reflect the
names of constants and types involved.  INCOMPATIBILITY.

  thelub_const    ~> lub_const
  lub_const       ~> is_lub_const
  thelubI         ~> lub_eqI
  is_lub_lub      ~> is_lubD2
  lubI            ~> is_lub_lub
  unique_lub      ~> is_lub_unique
  is_ub_lub       ~> is_lub_rangeD1
  lub_bin_chain   ~> is_lub_bin_chain
  lub_fun         ~> is_lub_fun
  thelub_fun      ~> lub_fun
  thelub_cfun     ~> lub_cfun
  thelub_Pair     ~> lub_Pair
  lub_cprod       ~> is_lub_prod
  thelub_cprod    ~> lub_prod
  minimal_cprod   ~> minimal_prod
  inst_cprod_pcpo ~> inst_prod_pcpo
  UU_I            ~> bottomI
  compact_UU      ~> compact_bottom
  deflation_UU    ~> deflation_bottom
  finite_deflation_UU ~> finite_deflation_bottom

* Many legacy theorem names have been discontinued.  INCOMPATIBILITY.

  sq_ord_less_eq_trans ~> below_eq_trans
  sq_ord_eq_less_trans ~> eq_below_trans
  refl_less            ~> below_refl
  trans_less           ~> below_trans
  antisym_less         ~> below_antisym
  antisym_less_inverse ~> po_eq_conv [THEN iffD1]
  box_less             ~> box_below
  rev_trans_less       ~> rev_below_trans
  not_less2not_eq      ~> not_below2not_eq
  less_UU_iff          ~> below_UU_iff
  flat_less_iff        ~> flat_below_iff
  adm_less             ~> adm_below
  adm_not_less         ~> adm_not_below
  adm_compact_not_less ~> adm_compact_not_below
  less_fun_def         ~> below_fun_def
  expand_fun_less      ~> fun_below_iff
  less_fun_ext         ~> fun_belowI
  less_discr_def       ~> below_discr_def
  discr_less_eq        ~> discr_below_eq
  less_unit_def        ~> below_unit_def
  less_cprod_def       ~> below_prod_def
  prod_lessI           ~> prod_belowI
  Pair_less_iff        ~> Pair_below_iff
  fst_less_iff         ~> fst_below_iff
  snd_less_iff         ~> snd_below_iff
  expand_cfun_less     ~> cfun_below_iff
  less_cfun_ext        ~> cfun_belowI
  injection_less       ~> injection_below
  less_up_def          ~> below_up_def
  not_Iup_less         ~> not_Iup_below
  Iup_less             ~> Iup_below
  up_less              ~> up_below
  Def_inject_less_eq   ~> Def_below_Def
  Def_less_is_eq       ~> Def_below_iff
  spair_less_iff       ~> spair_below_iff
  less_sprod           ~> below_sprod
  spair_less           ~> spair_below
  sfst_less_iff        ~> sfst_below_iff
  ssnd_less_iff        ~> ssnd_below_iff
  fix_least_less       ~> fix_least_below
  dist_less_one        ~> dist_below_one
  less_ONE             ~> below_ONE
  ONE_less_iff         ~> ONE_below_iff
  less_sinlD           ~> below_sinlD
  less_sinrD           ~> below_sinrD


*** FOL and ZF ***

* All constant names are now qualified internally and use proper
identifiers, e.g. "IFOL.eq" instead of "op =".  INCOMPATIBILITY.


*** ML ***

* Antiquotation @{assert} inlines a function bool -> unit that raises
Fail if the argument is false.  Due to inlining the source position of
failed assertions is included in the error output.

* Discontinued antiquotation @{theory_ref}, which is obsolete since ML
text is in practice always evaluated with a stable theory checkpoint.
Minor INCOMPATIBILITY, use (Theory.check_thy @{theory}) instead.

* Antiquotation @{theory A} refers to theory A from the ancestry of
the current context, not any accidental theory loader state as before.
Potential INCOMPATIBILITY, subtle change in semantics.

* Syntax.pretty_priority (default 0) configures the required priority
of pretty-printed output and thus affects insertion of parentheses.

* Syntax.default_root (default "any") configures the inner syntax
category (nonterminal symbol) for parsing of terms.

* Former exception Library.UnequalLengths now coincides with
ListPair.UnequalLengths.

* Renamed structure MetaSimplifier to Raw_Simplifier.  Note that the
main functionality is provided by structure Simplifier.

* Renamed raw "explode" function to "raw_explode" to emphasize its
meaning.  Note that internally to Isabelle, Symbol.explode is used in
almost all situations.

* Discontinued obsolete function sys_error and exception SYS_ERROR.
See implementation manual for further details on exceptions in
Isabelle/ML.

* Renamed setmp_noncritical to Unsynchronized.setmp to emphasize its
meaning.

* Renamed structure PureThy to Pure_Thy and moved most of its
operations to structure Global_Theory, to emphasize that this is
rarely-used global-only stuff.

* Discontinued Output.debug.  Minor INCOMPATIBILITY, use plain writeln
instead (or tracing for high-volume output).

* Configuration option show_question_marks only affects regular pretty
printing of types and terms, not raw Term.string_of_vname.

* ML_Context.thm and ML_Context.thms are no longer pervasive.  Rare
INCOMPATIBILITY, superseded by static antiquotations @{thm} and
@{thms} for most purposes.

* ML structure Unsynchronized is never opened, not even in Isar
interaction mode as before.  Old Unsynchronized.set etc. have been
discontinued -- use plain := instead.  This should be *rare* anyway,
since modern tools always work via official context data, notably
configuration options.

* Parallel and asynchronous execution requires special care concerning
interrupts.  Structure Exn provides some convenience functions that
avoid working directly with raw Interrupt.  User code must not absorb
interrupts -- intermediate handling (for cleanup etc.) needs to be
followed by re-raising of the original exception.  Another common
source of mistakes are "handle _" patterns, which make the meaning of
the program subject to physical effects of the environment.



New in Isabelle2009-2 (June 2010)
---------------------------------

*** General ***

* Authentic syntax for *all* logical entities (type classes, type
constructors, term constants): provides simple and robust
correspondence between formal entities and concrete syntax.  Within
the parse tree / AST representations, "constants" are decorated by
their category (class, type, const) and spelled out explicitly with
their full internal name.

Substantial INCOMPATIBILITY concerning low-level syntax declarations
and translations (translation rules and translation functions in ML).
Some hints on upgrading:

  - Many existing uses of 'syntax' and 'translations' can be replaced
    by more modern 'type_notation', 'notation' and 'abbreviation',
    which are independent of this issue.

  - 'translations' require markup within the AST; the term syntax
    provides the following special forms:

      CONST c   -- produces syntax version of constant c from context
      XCONST c  -- literally c, checked as constant from context
      c         -- literally c, if declared by 'syntax'

    Plain identifiers are treated as AST variables -- occasionally the
    system indicates accidental variables via the error "rhs contains
    extra variables".

    Type classes and type constructors are marked according to their
    concrete syntax.  Some old translations rules need to be written
    for the "type" category, using type constructor application
    instead of pseudo-term application of the default category
    "logic".

  - 'parse_translation' etc. in ML may use the following
    antiquotations:

      @{class_syntax c}   -- type class c within parse tree / AST
      @{term_syntax c}    -- type constructor c within parse tree / AST
      @{const_syntax c}   -- ML version of "CONST c" above
      @{syntax_const c}   -- literally c (checked wrt. 'syntax' declarations)

  - Literal types within 'typed_print_translations', i.e. those *not*
    represented as pseudo-terms are represented verbatim.  Use @{class
    c} or @{type_name c} here instead of the above syntax
    antiquotations.

Note that old non-authentic syntax was based on unqualified base
names, so all of the above "constant" names would coincide.  Recall
that 'print_syntax' and ML_command "set Syntax.trace_ast" help to
diagnose syntax problems.

* Type constructors admit general mixfix syntax, not just infix.

* Concrete syntax may be attached to local entities without a proof
body, too.  This works via regular mixfix annotations for 'fix',
'def', 'obtain' etc. or via the explicit 'write' command, which is
similar to the 'notation' command in theory specifications.

* Discontinued unnamed infix syntax (legacy feature for many years) --
need to specify constant name and syntax separately.  Internal ML
datatype constructors have been renamed from InfixName to Infix etc.
Minor INCOMPATIBILITY.

* Schematic theorem statements need to be explicitly markup as such,
via commands 'schematic_lemma', 'schematic_theorem',
'schematic_corollary'.  Thus the relevance of the proof is made
syntactically clear, which impacts performance in a parallel or
asynchronous interactive environment.  Minor INCOMPATIBILITY.

* Use of cumulative prems via "!" in some proof methods has been
discontinued (old legacy feature).

* References 'trace_simp' and 'debug_simp' have been replaced by
configuration options stored in the context. Enabling tracing (the
case of debugging is similar) in proofs works via

  using [[trace_simp = true]]

Tracing is then active for all invocations of the simplifier in
subsequent goal refinement steps. Tracing may also still be enabled or
disabled via the ProofGeneral settings menu.

* Separate commands 'hide_class', 'hide_type', 'hide_const',
'hide_fact' replace the former 'hide' KIND command.  Minor
INCOMPATIBILITY.

* Improved parallelism of proof term normalization: usedir -p2 -q0 is
more efficient than combinations with -q1 or -q2.


*** Pure ***

* Proofterms record type-class reasoning explicitly, using the
"unconstrain" operation internally.  This eliminates all sort
constraints from a theorem and proof, introducing explicit
OFCLASS-premises.  On the proof term level, this operation is
automatically applied at theorem boundaries, such that closed proofs
are always free of sort constraints.  INCOMPATIBILITY for tools that
inspect proof terms.

* Local theory specifications may depend on extra type variables that
are not present in the result type -- arguments TYPE('a) :: 'a itself
are added internally.  For example:

  definition unitary :: bool where "unitary = (ALL (x::'a) y. x = y)"

* Predicates of locales introduced by classes carry a mandatory
"class" prefix.  INCOMPATIBILITY.

* Vacuous class specifications observe default sort.  INCOMPATIBILITY.

* Old 'axclass' command has been discontinued.  INCOMPATIBILITY, use
'class' instead.

* Command 'code_reflect' allows to incorporate generated ML code into
runtime environment; replaces immature code_datatype antiquotation.
INCOMPATIBILITY.

* Code generator: simple concept for abstract datatypes obeying
invariants.

* Code generator: details of internal data cache have no impact on the
user space functionality any longer.

* Methods "unfold_locales" and "intro_locales" ignore non-locale
subgoals.  This is more appropriate for interpretations with 'where'.
INCOMPATIBILITY.

* Command 'example_proof' opens an empty proof body.  This allows to
experiment with Isar, without producing any persistent result.

* Commands 'type_notation' and 'no_type_notation' declare type syntax
within a local theory context, with explicit checking of the
constructors involved (in contrast to the raw 'syntax' versions).

* Commands 'types' and 'typedecl' now work within a local theory
context -- without introducing dependencies on parameters or
assumptions, which is not possible in Isabelle/Pure.

* Command 'defaultsort' has been renamed to 'default_sort', it works
within a local theory context.  Minor INCOMPATIBILITY.


*** HOL ***

* Command 'typedef' now works within a local theory context -- without
introducing dependencies on parameters or assumptions, which is not
possible in Isabelle/Pure/HOL.  Note that the logical environment may
contain multiple interpretations of local typedefs (with different
non-emptiness proofs), even in a global theory context.

* New package for quotient types.  Commands 'quotient_type' and
'quotient_definition' may be used for defining types and constants by
quotient constructions.  An example is the type of integers created by
quotienting pairs of natural numbers:

  fun
    intrel :: "(nat * nat) => (nat * nat) => bool"
  where
    "intrel (x, y) (u, v) = (x + v = u + y)"

  quotient_type int = "nat * nat" / intrel
    by (auto simp add: equivp_def expand_fun_eq)

  quotient_definition
    "0::int" is "(0::nat, 0::nat)"

The method "lifting" can be used to lift of theorems from the
underlying "raw" type to the quotient type.  The example
src/HOL/Quotient_Examples/FSet.thy includes such a quotient
construction and provides a reasoning infrastructure for finite sets.

* Renamed Library/Quotient.thy to Library/Quotient_Type.thy to avoid
clash with new theory Quotient in Main HOL.

* Moved the SMT binding into the main HOL session, eliminating
separate HOL-SMT session.

* List membership infix mem operation is only an input abbreviation.
INCOMPATIBILITY.

* Theory Library/Word.thy has been removed.  Use library Word/Word.thy
for future developements; former Library/Word.thy is still present in
the AFP entry RSAPPS.

* Theorem Int.int_induct renamed to Int.int_of_nat_induct and is no
longer shadowed.  INCOMPATIBILITY.

* Dropped theorem duplicate comp_arith; use semiring_norm instead.
INCOMPATIBILITY.

* Dropped theorem RealPow.real_sq_order; use power2_le_imp_le instead.
INCOMPATIBILITY.

* Dropped normalizing_semiring etc; use the facts in semiring classes
instead.  INCOMPATIBILITY.

* Dropped several real-specific versions of lemmas about floor and
ceiling; use the generic lemmas from theory "Archimedean_Field"
instead.  INCOMPATIBILITY.

  floor_number_of_eq         ~> floor_number_of
  le_floor_eq_number_of      ~> number_of_le_floor
  le_floor_eq_zero           ~> zero_le_floor
  le_floor_eq_one            ~> one_le_floor
  floor_less_eq_number_of    ~> floor_less_number_of
  floor_less_eq_zero         ~> floor_less_zero
  floor_less_eq_one          ~> floor_less_one
  less_floor_eq_number_of    ~> number_of_less_floor
  less_floor_eq_zero         ~> zero_less_floor
  less_floor_eq_one          ~> one_less_floor
  floor_le_eq_number_of      ~> floor_le_number_of
  floor_le_eq_zero           ~> floor_le_zero
  floor_le_eq_one            ~> floor_le_one
  floor_subtract_number_of   ~> floor_diff_number_of
  floor_subtract_one         ~> floor_diff_one
  ceiling_number_of_eq       ~> ceiling_number_of
  ceiling_le_eq_number_of    ~> ceiling_le_number_of
  ceiling_le_zero_eq         ~> ceiling_le_zero
  ceiling_le_eq_one          ~> ceiling_le_one
  less_ceiling_eq_number_of  ~> number_of_less_ceiling
  less_ceiling_eq_zero       ~> zero_less_ceiling
  less_ceiling_eq_one        ~> one_less_ceiling
  ceiling_less_eq_number_of  ~> ceiling_less_number_of
  ceiling_less_eq_zero       ~> ceiling_less_zero
  ceiling_less_eq_one        ~> ceiling_less_one
  le_ceiling_eq_number_of    ~> number_of_le_ceiling
  le_ceiling_eq_zero         ~> zero_le_ceiling
  le_ceiling_eq_one          ~> one_le_ceiling
  ceiling_subtract_number_of ~> ceiling_diff_number_of
  ceiling_subtract_one       ~> ceiling_diff_one

* Theory "Finite_Set": various folding_XXX locales facilitate the
application of the various fold combinators on finite sets.

* Library theory "RBT" renamed to "RBT_Impl"; new library theory "RBT"
provides abstract red-black tree type which is backed by "RBT_Impl" as
implementation.  INCOMPATIBILTY.

* Theory Library/Coinductive_List has been removed -- superseded by
AFP/thys/Coinductive.

* Theory PReal, including the type "preal" and related operations, has
been removed.  INCOMPATIBILITY.

* Real: new development using Cauchy Sequences.

* Split off theory "Big_Operators" containing setsum, setprod,
Inf_fin, Sup_fin, Min, Max from theory Finite_Set.  INCOMPATIBILITY.

* Theory "Rational" renamed to "Rat", for consistency with "Nat",
"Int" etc.  INCOMPATIBILITY.

* Constant Rat.normalize needs to be qualified.  INCOMPATIBILITY.

* New set of rules "ac_simps" provides combined assoc / commute
rewrites for all interpretations of the appropriate generic locales.

* Renamed theory "OrderedGroup" to "Groups" and split theory
"Ring_and_Field" into theories "Rings" and "Fields"; for more
appropriate and more consistent names suitable for name prefixes
within the HOL theories.  INCOMPATIBILITY.

* Some generic constants have been put to appropriate theories:
  - less_eq, less: Orderings
  - zero, one, plus, minus, uminus, times, abs, sgn: Groups
  - inverse, divide: Rings
INCOMPATIBILITY.

* More consistent naming of type classes involving orderings (and
lattices):

    lower_semilattice                   ~> semilattice_inf
    upper_semilattice                   ~> semilattice_sup

    dense_linear_order                  ~> dense_linorder

    pordered_ab_group_add               ~> ordered_ab_group_add
    pordered_ab_group_add_abs           ~> ordered_ab_group_add_abs
    pordered_ab_semigroup_add           ~> ordered_ab_semigroup_add
    pordered_ab_semigroup_add_imp_le    ~> ordered_ab_semigroup_add_imp_le
    pordered_cancel_ab_semigroup_add    ~> ordered_cancel_ab_semigroup_add
    pordered_cancel_comm_semiring       ~> ordered_cancel_comm_semiring
    pordered_cancel_semiring            ~> ordered_cancel_semiring
    pordered_comm_monoid_add            ~> ordered_comm_monoid_add
    pordered_comm_ring                  ~> ordered_comm_ring
    pordered_comm_semiring              ~> ordered_comm_semiring
    pordered_ring                       ~> ordered_ring
    pordered_ring_abs                   ~> ordered_ring_abs
    pordered_semiring                   ~> ordered_semiring

    ordered_ab_group_add                ~> linordered_ab_group_add
    ordered_ab_semigroup_add            ~> linordered_ab_semigroup_add
    ordered_cancel_ab_semigroup_add     ~> linordered_cancel_ab_semigroup_add
    ordered_comm_semiring_strict        ~> linordered_comm_semiring_strict
    ordered_field                       ~> linordered_field
    ordered_field_no_lb                 ~> linordered_field_no_lb
    ordered_field_no_ub                 ~> linordered_field_no_ub
    ordered_field_dense_linear_order    ~> dense_linordered_field
    ordered_idom                        ~> linordered_idom
    ordered_ring                        ~> linordered_ring
    ordered_ring_le_cancel_factor       ~> linordered_ring_le_cancel_factor
    ordered_ring_less_cancel_factor     ~> linordered_ring_less_cancel_factor
    ordered_ring_strict                 ~> linordered_ring_strict
    ordered_semidom                     ~> linordered_semidom
    ordered_semiring                    ~> linordered_semiring
    ordered_semiring_1                  ~> linordered_semiring_1
    ordered_semiring_1_strict           ~> linordered_semiring_1_strict
    ordered_semiring_strict             ~> linordered_semiring_strict

  The following slightly odd type classes have been moved to a
  separate theory Library/Lattice_Algebras:

    lordered_ab_group_add               ~> lattice_ab_group_add
    lordered_ab_group_add_abs           ~> lattice_ab_group_add_abs
    lordered_ab_group_add_meet          ~> semilattice_inf_ab_group_add
    lordered_ab_group_add_join          ~> semilattice_sup_ab_group_add
    lordered_ring                       ~> lattice_ring

INCOMPATIBILITY.

* Refined field classes:
  - classes division_ring_inverse_zero, field_inverse_zero,
    linordered_field_inverse_zero include rule inverse 0 = 0 --
    subsumes former division_by_zero class;
  - numerous lemmas have been ported from field to division_ring.
INCOMPATIBILITY.

* Refined algebra theorem collections:
  - dropped theorem group group_simps, use algebra_simps instead;
  - dropped theorem group ring_simps, use field_simps instead;
  - proper theorem collection field_simps subsumes former theorem
    groups field_eq_simps and field_simps;
  - dropped lemma eq_minus_self_iff which is a duplicate for
    equal_neg_zero.
INCOMPATIBILITY.

* Theory Finite_Set and List: some lemmas have been generalized from
sets to lattices:

  fun_left_comm_idem_inter      ~> fun_left_comm_idem_inf
  fun_left_comm_idem_union      ~> fun_left_comm_idem_sup
  inter_Inter_fold_inter        ~> inf_Inf_fold_inf
  union_Union_fold_union        ~> sup_Sup_fold_sup
  Inter_fold_inter              ~> Inf_fold_inf
  Union_fold_union              ~> Sup_fold_sup
  inter_INTER_fold_inter        ~> inf_INFI_fold_inf
  union_UNION_fold_union        ~> sup_SUPR_fold_sup
  INTER_fold_inter              ~> INFI_fold_inf
  UNION_fold_union              ~> SUPR_fold_sup

* Theory "Complete_Lattice": lemmas top_def and bot_def have been
replaced by the more convenient lemmas Inf_empty and Sup_empty.
Dropped lemmas Inf_insert_simp and Sup_insert_simp, which are subsumed
by Inf_insert and Sup_insert.  Lemmas Inf_UNIV and Sup_UNIV replace
former Inf_Univ and Sup_Univ.  Lemmas inf_top_right and sup_bot_right
subsume inf_top and sup_bot respectively.  INCOMPATIBILITY.

* Reorganized theory Multiset: swapped notation of pointwise and
multiset order:

  - pointwise ordering is instance of class order with standard syntax
    <= and <;
  - multiset ordering has syntax <=# and <#; partial order properties
    are provided by means of interpretation with prefix
    multiset_order;
  - less duplication, less historical organization of sections,
    conversion from associations lists to multisets, rudimentary code
    generation;
  - use insert_DiffM2 [symmetric] instead of elem_imp_eq_diff_union,
    if needed.

Renamed:

  multiset_eq_conv_count_eq  ~>  multiset_ext_iff
  multi_count_ext  ~>  multiset_ext
  diff_union_inverse2  ~>  diff_union_cancelR

INCOMPATIBILITY.

* Theory Permutation: replaced local "remove" by List.remove1.

* Code generation: ML and OCaml code is decorated with signatures.

* Theory List: added transpose.

* Library/Nat_Bijection.thy is a collection of bijective functions
between nat and other types, which supersedes the older libraries
Library/Nat_Int_Bij.thy and HOLCF/NatIso.thy.  INCOMPATIBILITY.

  Constants:
  Nat_Int_Bij.nat2_to_nat         ~> prod_encode
  Nat_Int_Bij.nat_to_nat2         ~> prod_decode
  Nat_Int_Bij.int_to_nat_bij      ~> int_encode
  Nat_Int_Bij.nat_to_int_bij      ~> int_decode
  Countable.pair_encode           ~> prod_encode
  NatIso.prod2nat                 ~> prod_encode
  NatIso.nat2prod                 ~> prod_decode
  NatIso.sum2nat                  ~> sum_encode
  NatIso.nat2sum                  ~> sum_decode
  NatIso.list2nat                 ~> list_encode
  NatIso.nat2list                 ~> list_decode
  NatIso.set2nat                  ~> set_encode
  NatIso.nat2set                  ~> set_decode

  Lemmas:
  Nat_Int_Bij.bij_nat_to_int_bij  ~> bij_int_decode
  Nat_Int_Bij.nat2_to_nat_inj     ~> inj_prod_encode
  Nat_Int_Bij.nat2_to_nat_surj    ~> surj_prod_encode
  Nat_Int_Bij.nat_to_nat2_inj     ~> inj_prod_decode
  Nat_Int_Bij.nat_to_nat2_surj    ~> surj_prod_decode
  Nat_Int_Bij.i2n_n2i_id          ~> int_encode_inverse
  Nat_Int_Bij.n2i_i2n_id          ~> int_decode_inverse
  Nat_Int_Bij.surj_nat_to_int_bij ~> surj_int_encode
  Nat_Int_Bij.surj_int_to_nat_bij ~> surj_int_decode
  Nat_Int_Bij.inj_nat_to_int_bij  ~> inj_int_encode
  Nat_Int_Bij.inj_int_to_nat_bij  ~> inj_int_decode
  Nat_Int_Bij.bij_nat_to_int_bij  ~> bij_int_encode
  Nat_Int_Bij.bij_int_to_nat_bij  ~> bij_int_decode

* Sledgehammer:
  - Renamed ATP commands:
    atp_info     ~> sledgehammer running_atps
    atp_kill     ~> sledgehammer kill_atps
    atp_messages ~> sledgehammer messages
    atp_minimize ~> sledgehammer minimize
    print_atps   ~> sledgehammer available_atps
    INCOMPATIBILITY.
  - Added user's manual ("isabelle doc sledgehammer").
  - Added option syntax and "sledgehammer_params" to customize
    Sledgehammer's behavior.  See the manual for details.
  - Modified the Isar proof reconstruction code so that it produces
    direct proofs rather than proofs by contradiction.  (This feature
    is still experimental.)
  - Made Isar proof reconstruction work for SPASS, remote ATPs, and in
    full-typed mode.
  - Added support for TPTP syntax for SPASS via the "spass_tptp" ATP.

* Nitpick:
  - Added and implemented "binary_ints" and "bits" options.