NEWS
author wenzelm
Wed Apr 14 11:24:09 1999 +0200 (1999-04-14)
changeset 6420 c4072604378e
parent 6415 9d2123268db6
child 6449 d031cb5ea2fc
permissions -rw-r--r--
tuned;
wenzelm@6420
     1
wenzelm@5363
     2
Isabelle NEWS -- history user-relevant changes
wenzelm@5363
     3
==============================================
wenzelm@2553
     4
wenzelm@4981
     5
New in this Isabelle version
wenzelm@4981
     6
----------------------------
oheimb@4649
     7
paulson@5931
     8
*** Overview of INCOMPATIBILITIES (see below for more details) ***
paulson@5931
     9
wenzelm@6269
    10
* HOL: Removed the obsolete syntax "Compl A"; use -A for set
wenzelm@6269
    11
complement;
paulson@5931
    12
wenzelm@6269
    13
* HOL: the predicate "inj" is now defined by translation to "inj_on";
paulson@6174
    14
wenzelm@6386
    15
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
    16
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
    17
wenzelm@6269
    18
* ZF: The con_defs part of an inductive definition may no longer refer
wenzelm@6269
    19
to constants declared in the same theory;
nipkow@6057
    20
wenzelm@6269
    21
* HOL, ZF: the function mk_cases, generated by the inductive
wenzelm@6269
    22
definition package, has lost an argument.  To simplify its result, it
wenzelm@6269
    23
uses the default simpset instead of a supplied list of theorems.
paulson@6141
    24
nipkow@6057
    25
paulson@6069
    26
*** Proof tools ***
paulson@6069
    27
wenzelm@6343
    28
* Provers/Arith/fast_lin_arith.ML contains a functor for creating a
wenzelm@6343
    29
decision procedure for linear arithmetic. Currently it is used for
wenzelm@6343
    30
types `nat' and `int' in HOL (see below) but can, should and will be
wenzelm@6343
    31
instantiated for other types and logics as well.
paulson@6069
    32
paulson@6069
    33
paulson@6014
    34
*** General ***
paulson@6014
    35
wenzelm@6343
    36
* in locales, the "assumes" and "defines" parts may be omitted if
wenzelm@6343
    37
empty;
wenzelm@5973
    38
wenzelm@6269
    39
* new print_mode "xsymbols" for extended symbol support (e.g. genuine
wenzelm@6269
    40
long arrows);
wenzelm@6259
    41
wenzelm@6343
    42
* new print_mode "HTML";
wenzelm@6343
    43
wenzelm@6259
    44
* path element specification '~~' refers to '$ISABELLE_HOME';
wenzelm@6259
    45
wenzelm@6343
    46
* new flag show_tags controls display of tags of theorems (which are
wenzelm@6343
    47
basically just comments that may be attached by some tools);
wenzelm@6343
    48
wenzelm@6420
    49
* improved isatool install: option -k creates KDE application icon,
wenzelm@6420
    50
option -p DIR installs standalone binaries;
wenzelm@6415
    51
wenzelm@6413
    52
* added ML_PLATFORM setting (useful for cross-platform installations);
wenzelm@6413
    53
oheimb@6028
    54
nipkow@6057
    55
*** HOL ***
nipkow@6057
    56
wenzelm@6343
    57
* There are now decision procedures for linear arithmetic over nat and
wenzelm@6343
    58
int:
nipkow@6131
    59
wenzelm@6343
    60
1. arith_tac copes with arbitrary formulae involving `=', `<', `<=',
wenzelm@6343
    61
`+', `-', `Suc', `min', `max' and numerical constants; other subterms
wenzelm@6343
    62
are treated as atomic; subformulae not involving type `nat' or `int'
wenzelm@6343
    63
are ignored; quantified subformulae are ignored unless they are
wenzelm@6343
    64
positive universal or negative existential. The tactic has to be
wenzelm@6343
    65
invoked by hand and can be a little bit slow. In particular, the
wenzelm@6343
    66
running time is exponential in the number of occurrences of `min' and
wenzelm@6343
    67
`max', and `-' on `nat'.
nipkow@6131
    68
wenzelm@6343
    69
2. fast_arith_tac is a cut-down version of arith_tac: it only takes
wenzelm@6343
    70
(negated) (in)equalities among the premises and the conclusion into
wenzelm@6343
    71
account (i.e. no compound formulae) and does not know about `min' and
wenzelm@6343
    72
`max', and `-' on `nat'. It is fast and is used automatically by the
wenzelm@6343
    73
simplifier.
nipkow@6131
    74
wenzelm@6343
    75
NB: At the moment, these decision procedures do not cope with mixed
wenzelm@6343
    76
nat/int formulae where the two parts interact, such as `m < n ==>
wenzelm@6343
    77
int(m) < int(n)'.
oheimb@6028
    78
nipkow@6403
    79
* New bounded quantifier syntax (input only):
nipkow@6403
    80
  ! x < y. P, ! x <= y. P, ? x < y. P, ? x <= y. P
nipkow@6403
    81
wenzelm@6278
    82
* HOL/TLA (Lamport's Temporal Logic of Actions): major reorganization
wenzelm@6278
    83
-- avoids syntactic ambiguities and treats state, transition, and
wenzelm@6278
    84
temporal levels more uniformly; introduces INCOMPATIBILITIES due to
wenzelm@6278
    85
changed syntax and (many) tactics;
wenzelm@6278
    86
wenzelm@6386
    87
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
    88
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
    89
wenzelm@6269
    90
paulson@6064
    91
*** ZF ***
paulson@6064
    92
paulson@6064
    93
* new primrec section allows primitive recursive functions to be given
wenzelm@6269
    94
directly (as in HOL) over datatypes and the natural numbers;
paulson@6064
    95
wenzelm@6269
    96
* new tactics induct_tac and exhaust_tac for induction (or case
wenzelm@6269
    97
analysis) over datatypes and the natural numbers;
paulson@6064
    98
paulson@6064
    99
* the datatype declaration of type T now defines the recursor T_rec;
paulson@6064
   100
paulson@6141
   101
* simplification automatically does freeness reasoning for datatype
wenzelm@6269
   102
constructors;
paulson@6141
   103
wenzelm@6269
   104
* automatic type-inference, with AddTCs command to insert new
wenzelm@6269
   105
type-checking rules;
paulson@6155
   106
wenzelm@6269
   107
* datatype introduction rules are now added as Safe Introduction rules
wenzelm@6269
   108
to the claset;
paulson@6155
   109
wenzelm@6269
   110
* the syntax "if P then x else y" is now available in addition to
wenzelm@6269
   111
if(P,x,y);
wenzelm@6269
   112
paulson@6069
   113
wenzelm@6343
   114
*** Internal programming interfaces ***
wenzelm@6343
   115
wenzelm@6386
   116
* AxClass.axclass_tac lost the theory argument;
wenzelm@6386
   117
wenzelm@6343
   118
* tuned current_goals_markers semantics: begin / end goal avoids
wenzelm@6343
   119
printing empty lines;
wenzelm@6343
   120
wenzelm@6343
   121
* removed prs and prs_fn hook, which was broken because it did not
wenzelm@6343
   122
include \n in its semantics, forcing writeln to add one
wenzelm@6343
   123
uncoditionally; replaced prs_fn by writeln_fn; consider std_output:
wenzelm@6343
   124
string -> unit if you really want to output text without newline;
wenzelm@6343
   125
wenzelm@6343
   126
* Symbol.output subject to print mode; INCOMPATIBILITY: defaults to
wenzelm@6343
   127
plain output, interface builders may have to enable 'isabelle_font'
wenzelm@6343
   128
mode to get Isabelle font glyphs as before;
wenzelm@6343
   129
wenzelm@6343
   130
* refined token_translation interface; INCOMPATIBILITY: output length
wenzelm@6343
   131
now of type real instead of int;
wenzelm@6343
   132
wenzelm@6343
   133
paulson@6064
   134
wenzelm@5781
   135
New in Isabelle98-1 (October 1998)
wenzelm@5781
   136
----------------------------------
wenzelm@5781
   137
wenzelm@5127
   138
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4842
   139
wenzelm@5726
   140
* several changes of automated proof tools;
wenzelm@5373
   141
wenzelm@5726
   142
* HOL: major changes to the inductive and datatype packages, including
wenzelm@5726
   143
some minor incompatibilities of theory syntax;
berghofe@5214
   144
wenzelm@5726
   145
* HOL: renamed r^-1 to 'converse' from 'inverse'; 'inj_onto' is now
wenzelm@5217
   146
called `inj_on';
paulson@5160
   147
nipkow@5275
   148
* HOL: removed duplicate thms in Arith:
nipkow@5275
   149
  less_imp_add_less  should be replaced by  trans_less_add1
nipkow@5275
   150
  le_imp_add_le      should be replaced by  trans_le_add1
paulson@5160
   151
wenzelm@5726
   152
* HOL: unary minus is now overloaded (new type constraints may be
wenzelm@5726
   153
required);
paulson@5490
   154
wenzelm@5726
   155
* HOL and ZF: unary minus for integers is now #- instead of #~.  In
wenzelm@5726
   156
ZF, expressions such as n#-1 must be changed to n#- 1, since #-1 is
wenzelm@5726
   157
now taken as an integer constant.
paulson@5541
   158
wenzelm@5726
   159
* Pure: ML function 'theory_of' renamed to 'theory';
wenzelm@5397
   160
wenzelm@5363
   161
wenzelm@5127
   162
*** Proof tools ***
nipkow@4880
   163
nipkow@5657
   164
* Simplifier:
nipkow@5657
   165
  1. Asm_full_simp_tac is now more aggressive.
nipkow@5657
   166
     1. It will sometimes reorient premises if that increases their power to
nipkow@5657
   167
        simplify.
nipkow@5657
   168
     2. It does no longer proceed strictly from left to right but may also
nipkow@5657
   169
        rotate premises to achieve further simplification.
nipkow@5657
   170
     For compatibility reasons there is now Asm_lr_simp_tac which is like the
nipkow@5657
   171
     old Asm_full_simp_tac in that it does not rotate premises.
nipkow@5657
   172
  2. The simplifier now knows a little bit about nat-arithmetic.
nipkow@4880
   173
wenzelm@5127
   174
* Classical reasoner: wrapper mechanism for the classical reasoner now
wenzelm@5127
   175
allows for selected deletion of wrappers, by introduction of names for
wenzelm@5127
   176
wrapper functionals.  This implies that addbefore, addSbefore,
wenzelm@5127
   177
addaltern, and addSaltern now take a pair (name, tactic) as argument,
wenzelm@5127
   178
and that adding two tactics with the same name overwrites the first
wenzelm@5127
   179
one (emitting a warning).
oheimb@4824
   180
  type wrapper = (int -> tactic) -> (int -> tactic)
oheimb@4649
   181
  setWrapper, setSWrapper, compWrapper and compSWrapper are replaced by
oheimb@4824
   182
  addWrapper, addSWrapper: claset * (string * wrapper) -> claset
oheimb@4824
   183
  delWrapper, delSWrapper: claset *  string            -> claset
oheimb@4649
   184
  getWrapper is renamed to appWrappers, getSWrapper to appSWrappers;
oheimb@4649
   185
wenzelm@5705
   186
* Classical reasoner: addbefore/addSbefore now have APPEND/ORELSE
wenzelm@5726
   187
semantics; addbefore now affects only the unsafe part of step_tac
wenzelm@5726
   188
etc.; this affects addss/auto_tac/force_tac, so EXISTING PROOFS MAY
wenzelm@5726
   189
FAIL, but proofs should be fixable easily, e.g. by replacing Auto_tac
wenzelm@5726
   190
by Force_tac;
oheimb@5524
   191
wenzelm@5726
   192
* Classical reasoner: setwrapper to setWrapper and compwrapper to
wenzelm@5726
   193
compWrapper; added safe wrapper (and access functions for it);
oheimb@5524
   194
wenzelm@5127
   195
* HOL/split_all_tac is now much faster and fails if there is nothing
wenzelm@5726
   196
to split.  Some EXISTING PROOFS MAY REQUIRE ADAPTION because the order
wenzelm@5726
   197
and the names of the automatically generated variables have changed.
wenzelm@5726
   198
split_all_tac has moved within claset() from unsafe wrappers to safe
wenzelm@5726
   199
wrappers, which means that !!-bound variables are split much more
wenzelm@5726
   200
aggressively, and safe_tac and clarify_tac now split such variables.
wenzelm@5726
   201
If this splitting is not appropriate, use delSWrapper "split_all_tac".
wenzelm@5726
   202
Note: the same holds for record_split_tac, which does the job of
wenzelm@5726
   203
split_all_tac for record fields.
wenzelm@5127
   204
wenzelm@5726
   205
* HOL/Simplifier: Rewrite rules for case distinctions can now be added
wenzelm@5726
   206
permanently to the default simpset using Addsplits just like
wenzelm@5726
   207
Addsimps. They can be removed via Delsplits just like
wenzelm@5726
   208
Delsimps. Lower-case versions are also available.
wenzelm@5127
   209
wenzelm@5726
   210
* HOL/Simplifier: The rule split_if is now part of the default
wenzelm@5726
   211
simpset. This means that the simplifier will eliminate all occurrences
wenzelm@5726
   212
of if-then-else in the conclusion of a goal. To prevent this, you can
wenzelm@5726
   213
either remove split_if completely from the default simpset by
wenzelm@5726
   214
`Delsplits [split_if]' or remove it in a specific call of the
wenzelm@5726
   215
simplifier using `... delsplits [split_if]'.  You can also add/delete
wenzelm@5726
   216
other case splitting rules to/from the default simpset: every datatype
wenzelm@5726
   217
generates suitable rules `split_t_case' and `split_t_case_asm' (where
wenzelm@5726
   218
t is the name of the datatype).
wenzelm@5127
   219
wenzelm@5726
   220
* Classical reasoner / Simplifier combination: new force_tac (and
wenzelm@5127
   221
derivatives Force_tac, force) combines rewriting and classical
wenzelm@5127
   222
reasoning (and whatever other tools) similarly to auto_tac, but is
wenzelm@5726
   223
aimed to solve the given subgoal completely.
wenzelm@5127
   224
wenzelm@5127
   225
wenzelm@5127
   226
*** General ***
wenzelm@5127
   227
wenzelm@5217
   228
* new top-level commands `Goal' and `Goalw' that improve upon `goal'
wenzelm@5127
   229
and `goalw': the theory is no longer needed as an explicit argument -
wenzelm@5127
   230
the current theory context is used; assumptions are no longer returned
wenzelm@5127
   231
at the ML-level unless one of them starts with ==> or !!; it is
wenzelm@5217
   232
recommended to convert to these new commands using isatool fixgoal
wenzelm@5217
   233
(backup your sources first!);
wenzelm@4842
   234
wenzelm@5217
   235
* new top-level commands 'thm' and 'thms' for retrieving theorems from
wenzelm@5207
   236
the current theory context, and 'theory' to lookup stored theories;
paulson@4806
   237
paulson@5722
   238
* new theory section 'locale' for declaring constants, assumptions and
paulson@5722
   239
definitions that have local scope;
paulson@5722
   240
wenzelm@5127
   241
* new theory section 'nonterminals' for purely syntactic types;
wenzelm@4858
   242
wenzelm@5127
   243
* new theory section 'setup' for generic ML setup functions
wenzelm@5127
   244
(e.g. package initialization);
wenzelm@4869
   245
wenzelm@5131
   246
* the distribution now includes Isabelle icons: see
wenzelm@5131
   247
lib/logo/isabelle-{small,tiny}.xpm;
wenzelm@5131
   248
wenzelm@5363
   249
* isatool install - install binaries with absolute references to
wenzelm@5363
   250
ISABELLE_HOME/bin;
wenzelm@5363
   251
wenzelm@5572
   252
* isatool logo -- create instances of the Isabelle logo (as EPS);
wenzelm@5572
   253
wenzelm@5407
   254
* print mode 'emacs' reserved for Isamode;
wenzelm@5407
   255
wenzelm@5726
   256
* support multiple print (ast) translations per constant name;
wenzelm@5726
   257
wenzelm@4711
   258
paulson@4661
   259
*** HOL ***
paulson@4661
   260
wenzelm@5710
   261
* there is now a tutorial on Isabelle/HOL (do 'isatool doc tutorial');
nipkow@5709
   262
wenzelm@5217
   263
* HOL/inductive package reorganized and improved: now supports mutual
paulson@5267
   264
definitions such as
wenzelm@5217
   265
wenzelm@5217
   266
  inductive EVEN ODD
wenzelm@5217
   267
    intrs
wenzelm@5217
   268
      null "0 : EVEN"
wenzelm@5217
   269
      oddI "n : EVEN ==> Suc n : ODD"
wenzelm@5217
   270
      evenI "n : ODD ==> Suc n : EVEN"
wenzelm@5217
   271
wenzelm@5217
   272
new theorem list "elims" contains an elimination rule for each of the
wenzelm@5217
   273
recursive sets; inductive definitions now handle disjunctive premises
wenzelm@5217
   274
correctly (also ZF);
berghofe@5214
   275
wenzelm@5217
   276
INCOMPATIBILITIES: requires Inductive as an ancestor; component
wenzelm@5217
   277
"mutual_induct" no longer exists - the induction rule is always
wenzelm@5217
   278
contained in "induct";
wenzelm@5217
   279
wenzelm@5217
   280
wenzelm@5217
   281
* HOL/datatype package re-implemented and greatly improved: now
paulson@5267
   282
supports mutually recursive datatypes such as
wenzelm@5217
   283
wenzelm@5217
   284
  datatype
wenzelm@5217
   285
    'a aexp = IF_THEN_ELSE ('a bexp) ('a aexp) ('a aexp)
wenzelm@5217
   286
            | SUM ('a aexp) ('a aexp)
wenzelm@5217
   287
            | DIFF ('a aexp) ('a aexp)
wenzelm@5217
   288
            | NUM 'a
wenzelm@5217
   289
  and
wenzelm@5217
   290
    'a bexp = LESS ('a aexp) ('a aexp)
wenzelm@5217
   291
            | AND ('a bexp) ('a bexp)
wenzelm@5217
   292
            | OR ('a bexp) ('a bexp)
wenzelm@5217
   293
paulson@5267
   294
as well as indirectly recursive datatypes such as
berghofe@5214
   295
wenzelm@5217
   296
  datatype
wenzelm@5217
   297
    ('a, 'b) term = Var 'a
wenzelm@5217
   298
                  | App 'b ((('a, 'b) term) list)
berghofe@5214
   299
wenzelm@5217
   300
The new tactic  mutual_induct_tac [<var_1>, ..., <var_n>] i  performs
wenzelm@5217
   301
induction on mutually / indirectly recursive datatypes.
wenzelm@5217
   302
wenzelm@5217
   303
Primrec equations are now stored in theory and can be accessed via
wenzelm@5217
   304
<function_name>.simps.
wenzelm@5217
   305
wenzelm@5217
   306
INCOMPATIBILITIES:
berghofe@5214
   307
wenzelm@5217
   308
  - Theories using datatypes must now have theory Datatype as an
wenzelm@5217
   309
    ancestor.
wenzelm@5217
   310
  - The specific <typename>.induct_tac no longer exists - use the
wenzelm@5217
   311
    generic induct_tac instead.
berghofe@5226
   312
  - natE has been renamed to nat.exhaust - use exhaust_tac
wenzelm@5217
   313
    instead of res_inst_tac ... natE. Note that the variable
berghofe@5226
   314
    names in nat.exhaust differ from the names in natE, this
wenzelm@5217
   315
    may cause some "fragile" proofs to fail.
wenzelm@5217
   316
  - The theorems split_<typename>_case and split_<typename>_case_asm
wenzelm@5217
   317
    have been renamed to <typename>.split and <typename>.split_asm.
wenzelm@5217
   318
  - Since default sorts of type variables are now handled correctly,
wenzelm@5217
   319
    some datatype definitions may have to be annotated with explicit
wenzelm@5217
   320
    sort constraints.
wenzelm@5217
   321
  - Primrec definitions no longer require function name and type
wenzelm@5217
   322
    of recursive argument.
berghofe@5214
   323
wenzelm@5217
   324
Consider using isatool fixdatatype to adapt your theories and proof
wenzelm@5217
   325
scripts to the new package (backup your sources first!).
wenzelm@5217
   326
wenzelm@5217
   327
wenzelm@5726
   328
* HOL/record package: considerably improved implementation; now
wenzelm@5726
   329
includes concrete syntax for record types, terms, updates; theorems
wenzelm@5726
   330
for surjective pairing and splitting !!-bound record variables; proof
wenzelm@5726
   331
support is as follows:
wenzelm@5726
   332
wenzelm@5726
   333
  1) standard conversions (selectors or updates applied to record
wenzelm@5726
   334
constructor terms) are part of the standard simpset;
wenzelm@5726
   335
wenzelm@5726
   336
  2) inject equations of the form ((x, y) = (x', y')) == x=x' & y=y' are
wenzelm@5726
   337
made part of standard simpset and claset via addIffs;
wenzelm@5726
   338
wenzelm@5726
   339
  3) a tactic for record field splitting (record_split_tac) is part of
wenzelm@5726
   340
the standard claset (addSWrapper);
wenzelm@5726
   341
wenzelm@5726
   342
To get a better idea about these rules you may retrieve them via
wenzelm@5726
   343
something like 'thms "foo.simps"' or 'thms "foo.iffs"', where "foo" is
wenzelm@5726
   344
the name of your record type.
wenzelm@5726
   345
wenzelm@5726
   346
The split tactic 3) conceptually simplifies by the following rule:
wenzelm@5726
   347
wenzelm@5726
   348
  "(!!x. PROP ?P x) == (!!a b. PROP ?P (a, b))"
wenzelm@5726
   349
wenzelm@5726
   350
Thus any record variable that is bound by meta-all will automatically
wenzelm@5726
   351
blow up into some record constructor term, consequently the
wenzelm@5726
   352
simplifications of 1), 2) apply.  Thus force_tac, auto_tac etc. shall
wenzelm@5726
   353
solve record problems automatically.
wenzelm@5726
   354
berghofe@5214
   355
wenzelm@5125
   356
* reorganized the main HOL image: HOL/Integ and String loaded by
wenzelm@5125
   357
default; theory Main includes everything;
wenzelm@5125
   358
paulson@5650
   359
* automatic simplification of integer sums and comparisons, using cancellation;
paulson@5650
   360
oheimb@5526
   361
* added option_map_eq_Some and not_Some_eq to the default simpset and claset;
wenzelm@5127
   362
wenzelm@5127
   363
* added disj_not1 = "(~P | Q) = (P --> Q)" to the default simpset;
wenzelm@5127
   364
wenzelm@5127
   365
* many new identities for unions, intersections, set difference, etc.;
wenzelm@5127
   366
wenzelm@5127
   367
* expand_if, expand_split, expand_sum_case and expand_nat_case are now
wenzelm@5127
   368
called split_if, split_split, split_sum_case and split_nat_case (to go
wenzelm@5127
   369
with add/delsplits);
wenzelm@5125
   370
wenzelm@5127
   371
* HOL/Prod introduces simplification procedure unit_eq_proc rewriting
wenzelm@5127
   372
(?x::unit) = (); this is made part of the default simpset, which COULD
wenzelm@5127
   373
MAKE EXISTING PROOFS FAIL under rare circumstances (consider
wenzelm@5207
   374
'Delsimprocs [unit_eq_proc];' as last resort); also note that
wenzelm@5207
   375
unit_abs_eta_conv is added in order to counter the effect of
wenzelm@5207
   376
unit_eq_proc on (%u::unit. f u), replacing it by f rather than by
wenzelm@5207
   377
%u.f();
wenzelm@5125
   378
wenzelm@5217
   379
* HOL/Fun INCOMPATIBILITY: `inj_onto' is now called `inj_on' (which
wenzelm@5217
   380
makes more sense);
berghofe@5109
   381
paulson@5475
   382
* HOL/Set INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
   383
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
   384
  disjointness reasoning but breaking a few old proofs.
paulson@5267
   385
wenzelm@5217
   386
* HOL/Relation INCOMPATIBILITY: renamed the relational operator r^-1
wenzelm@5217
   387
to 'converse' from 'inverse' (for compatibility with ZF and some
wenzelm@5217
   388
literature);
wenzelm@5085
   389
wenzelm@5127
   390
* HOL/recdef can now declare non-recursive functions, with {} supplied as
wenzelm@5127
   391
the well-founded relation;
oheimb@4838
   392
paulson@5490
   393
* HOL/Set INCOMPATIBILITY: the complement of set A is now written -A instead of
paulson@5490
   394
    Compl A.  The "Compl" syntax remains available as input syntax for this
paulson@5490
   395
    release ONLY.
paulson@5490
   396
wenzelm@5127
   397
* HOL/Update: new theory of function updates:
wenzelm@5127
   398
    f(a:=b) == %x. if x=a then b else f x
wenzelm@5127
   399
may also be iterated as in f(a:=b,c:=d,...);
nipkow@5077
   400
wenzelm@5127
   401
* HOL/Vimage: new theory for inverse image of a function, syntax f-``B;
paulson@4899
   402
nipkow@5282
   403
* HOL/List:
nipkow@5282
   404
  - new function list_update written xs[i:=v] that updates the i-th
nipkow@5282
   405
    list position. May also be iterated as in xs[i:=a,j:=b,...].
nipkow@5428
   406
  - new function `upt' written [i..j(] which generates the list
nipkow@5428
   407
    [i,i+1,...,j-1], i.e. the upper bound is excluded. To include the upper
nipkow@5428
   408
    bound write [i..j], which is a shorthand for [i..j+1(].
nipkow@5282
   409
  - new lexicographic orderings and corresponding wellfoundedness theorems.
paulson@4779
   410
wenzelm@5127
   411
* HOL/Arith:
wenzelm@5127
   412
  - removed 'pred' (predecessor) function;
wenzelm@5127
   413
  - generalized some theorems about n-1;
wenzelm@5127
   414
  - many new laws about "div" and "mod";
wenzelm@5127
   415
  - new laws about greatest common divisors (see theory ex/Primes);
oheimb@4766
   416
wenzelm@5127
   417
* HOL/Relation: renamed the relational operator r^-1 "converse"
wenzelm@4842
   418
instead of "inverse";
wenzelm@4711
   419
nipkow@5651
   420
* HOL/Induct/Multiset: a theory of multisets, including the wellfoundedness
nipkow@5651
   421
  of the multiset ordering;
nipkow@5651
   422
wenzelm@5127
   423
* directory HOL/Real: a construction of the reals using Dedekind cuts
nipkow@5651
   424
  (not included by default);
nipkow@4835
   425
wenzelm@5127
   426
* directory HOL/UNITY: Chandy and Misra's UNITY formalism;
wenzelm@4711
   427
nipkow@5651
   428
* directory HOL/Hoare: a new version of Hoare logic which permits many-sorted
nipkow@5651
   429
  programs, i.e. different program variables may have different types.
nipkow@5651
   430
paulson@5142
   431
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
   432
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
   433
  Now rew can involve either definitions or equalities (either == or =).
wenzelm@5002
   434
wenzelm@5363
   435
paulson@4879
   436
*** ZF ***
paulson@4879
   437
paulson@5332
   438
* theory Main includes everything; INCOMPATIBILITY: theory ZF.thy contains
paulson@5332
   439
  only the theorems proved on ZF.ML;
paulson@5160
   440
paulson@5475
   441
* ZF INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
   442
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
   443
  disjointness reasoning but breaking a few old proofs.
paulson@5267
   444
paulson@5160
   445
* ZF/Update: new theory of function updates
paulson@5160
   446
    with default rewrite rule  f(x:=y) ` z = if(z=x, y, f`z)
paulson@5160
   447
  may also be iterated as in f(a:=b,c:=d,...);
paulson@5160
   448
paulson@4879
   449
* in  let x=t in u(x), neither t nor u(x) has to be an FOL term.
oheimb@4649
   450
paulson@5142
   451
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
   452
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
   453
  Now rew can involve either definitions or equalities (either == or =).
paulson@5142
   454
paulson@5160
   455
* case_tac provided for compatibility with HOL
paulson@5160
   456
    (like the old excluded_middle_tac, but with subgoals swapped)
paulson@5160
   457
wenzelm@4842
   458
wenzelm@5127
   459
*** Internal programming interfaces ***
wenzelm@5002
   460
wenzelm@5251
   461
* Pure: several new basic modules made available for general use, see
wenzelm@5251
   462
also src/Pure/README;
wenzelm@5207
   463
wenzelm@5008
   464
* improved the theory data mechanism to support encapsulation (data
wenzelm@5008
   465
kind name replaced by private Object.kind, acting as authorization
wenzelm@5373
   466
key); new type-safe user interface via functor TheoryDataFun; generic
wenzelm@5373
   467
print_data function becomes basically useless;
wenzelm@5002
   468
wenzelm@5251
   469
* removed global_names compatibility flag -- all theory declarations
wenzelm@5251
   470
are qualified by default;
wenzelm@5251
   471
wenzelm@5085
   472
* module Pure/Syntax now offers quote / antiquote translation
wenzelm@5085
   473
functions (useful for Hoare logic etc. with implicit dependencies);
wenzelm@5373
   474
see HOL/ex/Antiquote for an example use;
wenzelm@5085
   475
wenzelm@5127
   476
* Simplifier now offers conversions (asm_)(full_)rewrite: simpset ->
wenzelm@5127
   477
cterm -> thm;
wenzelm@5127
   478
wenzelm@5207
   479
* new tactical CHANGED_GOAL for checking that a tactic modifies a
wenzelm@5207
   480
subgoal;
paulson@5142
   481
wenzelm@5251
   482
* Display.print_goals function moved to Locale.print_goals;
wenzelm@5251
   483
wenzelm@5731
   484
* standard print function for goals supports current_goals_markers
wenzelm@5731
   485
variable for marking begin of proof, end of proof, start of goal; the
wenzelm@5731
   486
default is ("", "", ""); setting current_goals_markers := ("<proof>",
wenzelm@5731
   487
"</proof>", "<goal>") causes SGML like tagged proof state printing,
wenzelm@5731
   488
for example;
wenzelm@5731
   489
wenzelm@5002
   490
wenzelm@5002
   491
wenzelm@4410
   492
New in Isabelle98 (January 1998)
wenzelm@4410
   493
--------------------------------
wenzelm@4410
   494
wenzelm@4410
   495
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4410
   496
wenzelm@4410
   497
* changed lexical syntax of terms / types: dots made part of long
wenzelm@4410
   498
identifiers, e.g. "%x.x" no longer possible, should be "%x. x";
wenzelm@4410
   499
wenzelm@4410
   500
* simpset (and claset) reference variable replaced by functions
wenzelm@4410
   501
simpset / simpset_ref;
wenzelm@4410
   502
wenzelm@4410
   503
* no longer supports theory aliases (via merge) and non-trivial
wenzelm@4410
   504
implicit merge of thms' signatures;
wenzelm@4410
   505
wenzelm@4410
   506
* most internal names of constants changed due to qualified names;
wenzelm@4410
   507
wenzelm@4410
   508
* changed Pure/Sequence interface (see Pure/seq.ML);
wenzelm@4410
   509
wenzelm@3454
   510
paulson@3715
   511
*** General Changes ***
paulson@3715
   512
wenzelm@4174
   513
* hierachically structured name spaces (for consts, types, axms, thms
wenzelm@3943
   514
etc.); new lexical class 'longid' (e.g. Foo.bar.x) may render much of
wenzelm@4108
   515
old input syntactically incorrect (e.g. "%x.x"); COMPATIBILITY:
wenzelm@4108
   516
isatool fixdots ensures space after dots (e.g. "%x. x"); set
wenzelm@4174
   517
long_names for fully qualified output names; NOTE: ML programs
wenzelm@4174
   518
(special tactics, packages etc.) referring to internal names may have
wenzelm@4174
   519
to be adapted to cope with fully qualified names; in case of severe
wenzelm@4174
   520
backward campatibility problems try setting 'global_names' at compile
wenzelm@4174
   521
time to have enrything declared within a flat name space; one may also
wenzelm@4174
   522
fine tune name declarations in theories via the 'global' and 'local'
wenzelm@4174
   523
section;
wenzelm@4108
   524
wenzelm@4108
   525
* reimplemented the implicit simpset and claset using the new anytype
wenzelm@4108
   526
data filed in signatures; references simpset:simpset ref etc. are
wenzelm@4108
   527
replaced by functions simpset:unit->simpset and
wenzelm@4108
   528
simpset_ref:unit->simpset ref; COMPATIBILITY: use isatool fixclasimp
wenzelm@4108
   529
to patch your ML files accordingly;
paulson@3856
   530
wenzelm@3857
   531
* HTML output now includes theory graph data for display with Java
wenzelm@3857
   532
applet or isatool browser; data generated automatically via isatool
wenzelm@3901
   533
usedir (see -i option, ISABELLE_USEDIR_OPTIONS);
wenzelm@3857
   534
paulson@3856
   535
* defs may now be conditional; improved rewrite_goals_tac to handle
paulson@3856
   536
conditional equations;
paulson@3856
   537
wenzelm@4174
   538
* defs now admits additional type arguments, using TYPE('a) syntax;
wenzelm@4174
   539
wenzelm@3901
   540
* theory aliases via merge (e.g. M=A+B+C) no longer supported, always
wenzelm@3901
   541
creates a new theory node; implicit merge of thms' signatures is
wenzelm@4112
   542
restricted to 'trivial' ones; COMPATIBILITY: one may have to use
wenzelm@3901
   543
transfer:theory->thm->thm in (rare) cases;
wenzelm@3901
   544
wenzelm@3968
   545
* improved handling of draft signatures / theories; draft thms (and
wenzelm@3968
   546
ctyps, cterms) are automatically promoted to real ones;
wenzelm@3968
   547
wenzelm@3901
   548
* slightly changed interfaces for oracles: admit many per theory, named
wenzelm@3901
   549
(e.g. oracle foo = mlfun), additional name argument for invoke_oracle;
wenzelm@3901
   550
wenzelm@3901
   551
* print_goals: optional output of const types (set show_consts and
wenzelm@3901
   552
show_types);
wenzelm@3851
   553
wenzelm@4388
   554
* improved output of warnings (###) and errors (***);
wenzelm@3697
   555
paulson@4178
   556
* subgoal_tac displays a warning if the new subgoal has type variables;
paulson@4178
   557
paulson@3715
   558
* removed old README and Makefiles;
wenzelm@3697
   559
paulson@3856
   560
* replaced print_goals_ref hook by print_current_goals_fn and result_error_fn;
wenzelm@3670
   561
paulson@3715
   562
* removed obsolete init_pps and init_database;
paulson@3715
   563
paulson@3715
   564
* deleted the obsolete tactical STATE, which was declared by
paulson@3715
   565
    fun STATE tacfun st = tacfun st st;
paulson@3715
   566
wenzelm@4388
   567
* cd and use now support path variables, e.g. $ISABELLE_HOME, or ~
wenzelm@4388
   568
(which abbreviates $HOME);
wenzelm@4269
   569
wenzelm@4269
   570
* changed Pure/Sequence interface (see Pure/seq.ML); COMPATIBILITY:
wenzelm@4269
   571
use isatool fixseq to adapt your ML programs (this works for fully
wenzelm@4269
   572
qualified references to the Sequence structure only!);
wenzelm@4269
   573
wenzelm@4381
   574
* use_thy no longer requires writable current directory; it always
wenzelm@4381
   575
reloads .ML *and* .thy file, if either one is out of date;
wenzelm@4269
   576
paulson@3715
   577
paulson@3715
   578
*** Classical Reasoner ***
paulson@3715
   579
wenzelm@3744
   580
* Clarify_tac, clarify_tac, clarify_step_tac, Clarify_step_tac: new
wenzelm@3744
   581
tactics that use classical reasoning to simplify a subgoal without
wenzelm@3744
   582
splitting it into several subgoals;
paulson@3715
   583
paulson@3719
   584
* Safe_tac: like safe_tac but uses the default claset;
paulson@3719
   585
paulson@3715
   586
paulson@3715
   587
*** Simplifier ***
paulson@3715
   588
paulson@3715
   589
* added simplification meta rules:
paulson@3715
   590
    (asm_)(full_)simplify: simpset -> thm -> thm;
paulson@3715
   591
paulson@3715
   592
* simplifier.ML no longer part of Pure -- has to be loaded by object
paulson@3715
   593
logics (again);
paulson@3715
   594
paulson@3715
   595
* added prems argument to simplification procedures;
paulson@3715
   596
paulson@4325
   597
* HOL, FOL, ZF: added infix function `addsplits':
paulson@4325
   598
  instead of `<simpset> setloop (split_tac <thms>)'
paulson@4325
   599
  you can simply write `<simpset> addsplits <thms>'
paulson@4325
   600
paulson@3715
   601
paulson@3715
   602
*** Syntax ***
paulson@3715
   603
wenzelm@4174
   604
* TYPE('a) syntax for type reflection terms;
wenzelm@4174
   605
wenzelm@3985
   606
* no longer handles consts with name "" -- declare as 'syntax' instead;
paulson@3856
   607
paulson@3856
   608
* pretty printer: changed order of mixfix annotation preference (again!);
wenzelm@3846
   609
paulson@3715
   610
* Pure: fixed idt/idts vs. pttrn/pttrns syntactic categories;
paulson@3715
   611
paulson@3715
   612
paulson@3715
   613
*** HOL ***
paulson@3715
   614
wenzelm@5726
   615
* HOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
   616
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
   617
nipkow@4035
   618
* HOL/TLA: Stephan Merz's formalization of Lamport's Temporal Logic of Actions;
wenzelm@3985
   619
wenzelm@3985
   620
* HOL/Auth: new protocol proofs including some for the Internet
nipkow@4035
   621
  protocol TLS;
wenzelm@3985
   622
wenzelm@4125
   623
* HOL/Map: new theory of `maps' a la VDM;
nipkow@3982
   624
wenzelm@4335
   625
* HOL/simplifier: simplification procedures nat_cancel_sums for
wenzelm@4335
   626
cancelling out common nat summands from =, <, <= (in)equalities, or
wenzelm@4335
   627
differences; simplification procedures nat_cancel_factor for
wenzelm@4335
   628
cancelling common factor from =, <, <= (in)equalities over natural
wenzelm@4373
   629
sums; nat_cancel contains both kinds of procedures, it is installed by
wenzelm@4373
   630
default in Arith.thy -- this COULD MAKE EXISTING PROOFS FAIL;
wenzelm@4335
   631
nipkow@3580
   632
* HOL/simplifier: terms of the form
paulson@4325
   633
  `? x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x)'  (or t=x)
nipkow@3580
   634
  are rewritten to
nipkow@4035
   635
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t)',
nipkow@4035
   636
  and those of the form
paulson@4325
   637
  `! x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x) --> R(x)'  (or t=x)
nipkow@4035
   638
  are rewritten to
nipkow@4035
   639
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t) --> R(t)',
nipkow@4035
   640
nipkow@4035
   641
* HOL/datatype
nipkow@4035
   642
  Each datatype `t' now comes with a theorem `split_t_case' of the form
nipkow@3580
   643
nipkow@4035
   644
  P(t_case f1 ... fn x) =
nipkow@4035
   645
     ( (!y1 ... ym1. x = C1 y1 ... ym1 --> P(f1 y1 ... ym1)) &
nipkow@4035
   646
        ...
oheimb@4189
   647
       (!y1 ... ymn. x = Cn y1 ... ymn --> P(f1 y1 ... ymn))
nipkow@4035
   648
     )
nipkow@4035
   649
oheimb@4930
   650
  and a theorem `split_t_case_asm' of the form
oheimb@4189
   651
oheimb@4189
   652
  P(t_case f1 ... fn x) =
oheimb@4189
   653
    ~( (? y1 ... ym1. x = C1 y1 ... ym1 & ~P(f1 y1 ... ym1)) |
oheimb@4189
   654
        ...
oheimb@4189
   655
       (? y1 ... ymn. x = Cn y1 ... ymn & ~P(f1 y1 ... ymn))
oheimb@4189
   656
     )
oheimb@4930
   657
  which can be added to a simpset via `addsplits'. The existing theorems
oheimb@4930
   658
  expand_list_case and expand_option_case have been renamed to
oheimb@4930
   659
  split_list_case and split_option_case.
oheimb@4189
   660
nipkow@4361
   661
* HOL/Arithmetic:
nipkow@4361
   662
  - `pred n' is automatically converted to `n-1'.
nipkow@4361
   663
    Users are strongly encouraged not to use `pred' any longer,
nipkow@4361
   664
    because it will disappear altogether at some point.
nipkow@4361
   665
  - Users are strongly encouraged to write "0 < n" rather than
nipkow@4361
   666
    "n ~= 0". Theorems and proof tools have been modified towards this
nipkow@4361
   667
    `standard'.
nipkow@4357
   668
nipkow@4502
   669
* HOL/Lists:
nipkow@4502
   670
  the function "set_of_list" has been renamed "set" (and its theorems too);
nipkow@4502
   671
  the function "nth" now takes its arguments in the reverse order and
nipkow@4502
   672
  has acquired the infix notation "!" as in "xs!n".
paulson@3570
   673
paulson@4154
   674
* HOL/Set: UNIV is now a constant and is no longer translated to Compl{};
paulson@4154
   675
paulson@4154
   676
* HOL/Set: The operator (UN x.B x) now abbreviates (UN x:UNIV. B x) and its
paulson@4154
   677
  specialist theorems (like UN1_I) are gone.  Similarly for (INT x.B x);
paulson@4154
   678
wenzelm@4575
   679
* HOL/record: extensible records with schematic structural subtyping
wenzelm@4575
   680
(single inheritance); EXPERIMENTAL version demonstrating the encoding,
wenzelm@4575
   681
still lacks various theorems and concrete record syntax;
wenzelm@4575
   682
wenzelm@4125
   683
paulson@3715
   684
*** HOLCF ***
wenzelm@3535
   685
wenzelm@4125
   686
* removed "axioms" and "generated by" sections;
wenzelm@4125
   687
oheimb@4123
   688
* replaced "ops" section by extended "consts" section, which is capable of
wenzelm@4125
   689
  handling the continuous function space "->" directly;
wenzelm@4125
   690
wenzelm@4125
   691
* domain package:
wenzelm@4125
   692
  . proves theorems immediately and stores them in the theory,
wenzelm@4125
   693
  . creates hierachical name space,
wenzelm@4125
   694
  . now uses normal mixfix annotations (instead of cinfix...),
wenzelm@4125
   695
  . minor changes to some names and values (for consistency),
wenzelm@4125
   696
  . e.g. cases -> casedist, dists_eq -> dist_eqs, [take_lemma] -> take_lemmas,
wenzelm@4125
   697
  . separator between mutual domain defs: changed "," to "and",
wenzelm@4125
   698
  . improved handling of sort constraints;  now they have to
wenzelm@4125
   699
    appear on the left-hand side of the equations only;
oheimb@4123
   700
oheimb@4123
   701
* fixed LAM <x,y,zs>.b syntax;
wenzelm@3567
   702
wenzelm@3744
   703
* added extended adm_tac to simplifier in HOLCF -- can now discharge
wenzelm@3744
   704
adm (%x. P (t x)), where P is chainfinite and t continuous;
wenzelm@3579
   705
wenzelm@3579
   706
paulson@3719
   707
*** FOL and ZF ***
paulson@3719
   708
wenzelm@5726
   709
* FOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
   710
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
   711
wenzelm@3744
   712
* qed_spec_mp, qed_goal_spec_mp, qed_goalw_spec_mp are available, as
wenzelm@3744
   713
in HOL, they strip ALL and --> from proved theorems;
wenzelm@3744
   714
paulson@3719
   715
wenzelm@3579
   716
wenzelm@3006
   717
New in Isabelle94-8 (May 1997)
wenzelm@3006
   718
------------------------------
wenzelm@2654
   719
paulson@3002
   720
*** General Changes ***
paulson@3002
   721
paulson@3002
   722
* new utilities to build / run / maintain Isabelle etc. (in parts
paulson@3002
   723
still somewhat experimental); old Makefiles etc. still functional;
wenzelm@2971
   724
wenzelm@3205
   725
* new 'Isabelle System Manual';
wenzelm@3205
   726
wenzelm@2825
   727
* INSTALL text, together with ./configure and ./build scripts;
wenzelm@2773
   728
wenzelm@3006
   729
* reimplemented type inference for greater efficiency, better error
wenzelm@3006
   730
messages and clean internal interface;
paulson@3002
   731
paulson@3002
   732
* prlim command for dealing with lots of subgoals (an easier way of
paulson@3002
   733
setting goals_limit);
paulson@3002
   734
wenzelm@3006
   735
wenzelm@3006
   736
*** Syntax ***
paulson@3002
   737
wenzelm@3116
   738
* supports alternative (named) syntax tables (parser and pretty
wenzelm@3116
   739
printer); internal interface is provided by add_modesyntax(_i);
wenzelm@3116
   740
paulson@3002
   741
* Pure, FOL, ZF, HOL, HOLCF now support symbolic input and output; to
paulson@3002
   742
be used in conjunction with the Isabelle symbol font; uses the
paulson@3002
   743
"symbols" syntax table;
paulson@3002
   744
wenzelm@2705
   745
* added token_translation interface (may translate name tokens in
wenzelm@2756
   746
arbitrary ways, dependent on their type (free, bound, tfree, ...) and
wenzelm@3116
   747
the current print_mode); IMPORTANT: user print translation functions
wenzelm@3116
   748
are responsible for marking newly introduced bounds
wenzelm@3116
   749
(Syntax.mark_boundT);
wenzelm@2705
   750
wenzelm@2730
   751
* token translations for modes "xterm" and "xterm_color" that display
wenzelm@3006
   752
names in bold, underline etc. or colors (which requires a color
wenzelm@3006
   753
version of xterm);
wenzelm@2730
   754
paulson@3002
   755
* infixes may now be declared with names independent of their syntax;
paulson@3002
   756
paulson@3002
   757
* added typed_print_translation (like print_translation, but may
paulson@3002
   758
access type of constant);
paulson@3002
   759
wenzelm@3006
   760
paulson@3002
   761
*** Classical Reasoner ***
paulson@3002
   762
paulson@3002
   763
Blast_tac: a new tactic!  It is often more powerful than fast_tac, but has
paulson@3002
   764
some limitations.  Blast_tac...
paulson@3002
   765
  + ignores addss, addbefore, addafter; this restriction is intrinsic
paulson@3002
   766
  + ignores elimination rules that don't have the correct format
wenzelm@5726
   767
        (the conclusion MUST be a formula variable)
paulson@3002
   768
  + ignores types, which can make HOL proofs fail
paulson@3002
   769
  + rules must not require higher-order unification, e.g. apply_type in ZF
paulson@3002
   770
    [message "Function Var's argument not a bound variable" relates to this]
paulson@3002
   771
  + its proof strategy is more general but can actually be slower
paulson@3002
   772
wenzelm@3107
   773
* substitution with equality assumptions no longer permutes other
wenzelm@3107
   774
assumptions;
paulson@3002
   775
paulson@3002
   776
* minor changes in semantics of addafter (now called addaltern); renamed
paulson@3002
   777
setwrapper to setWrapper and compwrapper to compWrapper; added safe wrapper
wenzelm@3107
   778
(and access functions for it);
paulson@3002
   779
wenzelm@5726
   780
* improved combination of classical reasoner and simplifier:
oheimb@3317
   781
  + functions for handling clasimpsets
oheimb@3317
   782
  + improvement of addss: now the simplifier is called _after_ the
oheimb@3317
   783
    safe steps.
oheimb@3317
   784
  + safe variant of addss called addSss: uses safe simplifications
wenzelm@5726
   785
    _during_ the safe steps. It is more complete as it allows multiple
oheimb@3317
   786
    instantiations of unknowns (e.g. with slow_tac).
wenzelm@3006
   787
paulson@3002
   788
*** Simplifier ***
paulson@3002
   789
wenzelm@3006
   790
* added interface for simplification procedures (functions that
wenzelm@3006
   791
produce *proven* rewrite rules on the fly, depending on current
wenzelm@3006
   792
redex);
wenzelm@3006
   793
wenzelm@3006
   794
* ordering on terms as parameter (used for ordered rewriting);
wenzelm@3006
   795
wenzelm@3107
   796
* new functions delcongs, deleqcongs, and Delcongs. richer rep_ss;
paulson@3002
   797
paulson@3002
   798
* the solver is now split into a safe and an unsafe part.
paulson@3002
   799
This should be invisible for the normal user, except that the
paulson@3002
   800
functions setsolver and addsolver have been renamed to setSolver and
wenzelm@3107
   801
addSolver; added safe_asm_full_simp_tac;
paulson@3002
   802
paulson@3002
   803
paulson@3002
   804
*** HOL ***
paulson@3002
   805
nipkow@3042
   806
* a generic induction tactic `induct_tac' which works for all datatypes and
wenzelm@3107
   807
also for type `nat';
nipkow@3042
   808
nipkow@3316
   809
* a generic case distinction tactic `exhaust_tac' which works for all
nipkow@3316
   810
datatypes and also for type `nat';
nipkow@3316
   811
nipkow@3316
   812
* each datatype comes with a function `size';
nipkow@3316
   813
paulson@3002
   814
* patterns in case expressions allow tuple patterns as arguments to
wenzelm@3107
   815
constructors, for example `case x of [] => ... | (x,y,z)#ps => ...';
paulson@3002
   816
paulson@3002
   817
* primrec now also works with type nat;
paulson@3002
   818
paulson@3338
   819
* recdef: a new declaration form, allows general recursive functions to be
paulson@3338
   820
defined in theory files.  See HOL/ex/Fib, HOL/ex/Primes, HOL/Subst/Unify.
paulson@3338
   821
paulson@3002
   822
* the constant for negation has been renamed from "not" to "Not" to
wenzelm@3107
   823
harmonize with FOL, ZF, LK, etc.;
paulson@3002
   824
wenzelm@3107
   825
* HOL/ex/LFilter theory of a corecursive "filter" functional for
wenzelm@3107
   826
infinite lists;
paulson@3002
   827
wenzelm@3227
   828
* HOL/Modelcheck demonstrates invocation of model checker oracle;
wenzelm@3227
   829
paulson@3002
   830
* HOL/ex/Ring.thy declares cring_simp, which solves equational
paulson@3002
   831
problems in commutative rings, using axiomatic type classes for + and *;
paulson@3002
   832
paulson@3002
   833
* more examples in HOL/MiniML and HOL/Auth;
paulson@3002
   834
paulson@3002
   835
* more default rewrite rules for quantifiers, union/intersection;
paulson@3002
   836
nipkow@3321
   837
* a new constant `arbitrary == @x.False';
nipkow@3321
   838
wenzelm@3107
   839
* HOLCF/IOA replaces old HOL/IOA;
wenzelm@3107
   840
wenzelm@5726
   841
* HOLCF changes: derived all rules and arities
wenzelm@5726
   842
  + axiomatic type classes instead of classes
slotosch@2653
   843
  + typedef instead of faking type definitions
paulson@2747
   844
  + eliminated the internal constants less_fun, less_cfun, UU_fun, UU_cfun etc.
wenzelm@2730
   845
  + new axclasses cpo, chfin, flat with flat < chfin < pcpo < cpo < po
slotosch@2653
   846
  + eliminated the types void, one, tr
slotosch@2653
   847
  + use unit lift and bool lift (with translations) instead of one and tr
slotosch@2653
   848
  + eliminated blift from Lift3.thy (use Def instead of blift)
wenzelm@3107
   849
  all eliminated rules are derived as theorems --> no visible changes ;
oheimb@2649
   850
wenzelm@3006
   851
paulson@3002
   852
*** ZF ***
wenzelm@2553
   853
paulson@2865
   854
* ZF now has Fast_tac, Simp_tac and Auto_tac.  Union_iff is a now a default
paulson@2865
   855
rewrite rule; this may affect some proofs.  eq_cs is gone but can be put back
paulson@2865
   856
as ZF_cs addSIs [equalityI];
wenzelm@2553
   857
wenzelm@2554
   858
wenzelm@2732
   859
wenzelm@2553
   860
New in Isabelle94-7 (November 96)
wenzelm@2553
   861
---------------------------------
wenzelm@2553
   862
wenzelm@2553
   863
* allowing negative levels (as offsets) in prlev and choplev;
wenzelm@2553
   864
wenzelm@2554
   865
* super-linear speedup for large simplifications;
wenzelm@2554
   866
wenzelm@2554
   867
* FOL, ZF and HOL now use miniscoping: rewriting pushes
wenzelm@2554
   868
quantifications in as far as possible (COULD MAKE EXISTING PROOFS
wenzelm@2554
   869
FAIL); can suppress it using the command Delsimps (ex_simps @
wenzelm@2554
   870
all_simps); De Morgan laws are also now included, by default;
wenzelm@2554
   871
wenzelm@2554
   872
* improved printing of ==>  :  ~:
wenzelm@2554
   873
wenzelm@2554
   874
* new object-logic "Sequents" adds linear logic, while replacing LK
wenzelm@2554
   875
and Modal (thanks to Sara Kalvala);
wenzelm@2554
   876
wenzelm@2554
   877
* HOL/Auth: correctness proofs for authentication protocols;
wenzelm@2554
   878
wenzelm@2554
   879
* HOL: new auto_tac combines rewriting and classical reasoning (many
wenzelm@2554
   880
examples on HOL/Auth);
wenzelm@2554
   881
wenzelm@2554
   882
* HOL: new command AddIffs for declaring theorems of the form P=Q to
wenzelm@2554
   883
the rewriter and classical reasoner simultaneously;
wenzelm@2554
   884
wenzelm@2554
   885
* function uresult no longer returns theorems in "standard" format;
wenzelm@2554
   886
regain previous version by: val uresult = standard o uresult;
wenzelm@2554
   887
wenzelm@2554
   888
wenzelm@2554
   889
wenzelm@2554
   890
New in Isabelle94-6
wenzelm@2554
   891
-------------------
wenzelm@2554
   892
wenzelm@2554
   893
* oracles -- these establish an interface between Isabelle and trusted
wenzelm@2554
   894
external reasoners, which may deliver results as theorems;
wenzelm@2554
   895
wenzelm@2554
   896
* proof objects (in particular record all uses of oracles);
wenzelm@2554
   897
wenzelm@2554
   898
* Simp_tac, Fast_tac, etc. that refer to implicit simpset / claset;
wenzelm@2554
   899
wenzelm@2554
   900
* "constdefs" section in theory files;
wenzelm@2554
   901
wenzelm@2554
   902
* "primrec" section (HOL) no longer requires names;
wenzelm@2554
   903
wenzelm@2554
   904
* internal type "tactic" now simply "thm -> thm Sequence.seq";
wenzelm@2554
   905
wenzelm@2554
   906
wenzelm@2554
   907
wenzelm@2554
   908
New in Isabelle94-5
wenzelm@2554
   909
-------------------
wenzelm@2554
   910
wenzelm@2554
   911
* reduced space requirements;
wenzelm@2554
   912
wenzelm@2554
   913
* automatic HTML generation from theories;
wenzelm@2554
   914
wenzelm@2554
   915
* theory files no longer require "..." (quotes) around most types;
wenzelm@2554
   916
wenzelm@2554
   917
* new examples, including two proofs of the Church-Rosser theorem;
wenzelm@2554
   918
wenzelm@2554
   919
* non-curried (1994) version of HOL is no longer distributed;
wenzelm@2554
   920
wenzelm@2553
   921
paulson@2557
   922
paulson@2557
   923
New in Isabelle94-4
paulson@2557
   924
-------------------
paulson@2557
   925
paulson@2747
   926
* greatly reduced space requirements;
paulson@2557
   927
paulson@2557
   928
* theory files (.thy) no longer require \...\ escapes at line breaks;
paulson@2557
   929
wenzelm@5726
   930
* searchable theorem database (see the section "Retrieving theorems" on
paulson@2557
   931
page 8 of the Reference Manual);
paulson@2557
   932
paulson@2557
   933
* new examples, including Grabczewski's monumental case study of the
paulson@2557
   934
Axiom of Choice;
paulson@2557
   935
paulson@2557
   936
* The previous version of HOL renamed to Old_HOL;
paulson@2557
   937
wenzelm@5726
   938
* The new version of HOL (previously called CHOL) uses a curried syntax
paulson@2557
   939
for functions.  Application looks like f a b instead of f(a,b);
paulson@2557
   940
paulson@2557
   941
* Mutually recursive inductive definitions finally work in HOL;
paulson@2557
   942
paulson@2557
   943
* In ZF, pattern-matching on tuples is now available in all abstractions and
paulson@2557
   944
translates to the operator "split";
paulson@2557
   945
paulson@2557
   946
paulson@2557
   947
paulson@2557
   948
New in Isabelle94-3
paulson@2557
   949
-------------------
paulson@2557
   950
wenzelm@5726
   951
* new infix operator, addss, allowing the classical reasoner to
paulson@2557
   952
perform simplification at each step of its search.  Example:
wenzelm@5726
   953
        fast_tac (cs addss ss)
paulson@2557
   954
wenzelm@5726
   955
* a new logic, CHOL, the same as HOL, but with a curried syntax
wenzelm@5726
   956
for functions.  Application looks like f a b instead of f(a,b).  Also pairs
paulson@2557
   957
look like (a,b) instead of <a,b>;
paulson@2557
   958
paulson@2557
   959
* PLEASE NOTE: CHOL will eventually replace HOL!
paulson@2557
   960
paulson@2557
   961
* In CHOL, pattern-matching on tuples is now available in all abstractions.
paulson@2557
   962
It translates to the operator "split".  A new theory of integers is available;
paulson@2557
   963
paulson@2557
   964
* In ZF, integer numerals now denote two's-complement binary integers.
paulson@2557
   965
Arithmetic operations can be performed by rewriting.  See ZF/ex/Bin.ML;
paulson@2557
   966
wenzelm@5726
   967
* Many new examples: I/O automata, Church-Rosser theorem, equivalents
paulson@2557
   968
of the Axiom of Choice;
paulson@2557
   969
paulson@2557
   970
paulson@2557
   971
paulson@2557
   972
New in Isabelle94-2
paulson@2557
   973
-------------------
paulson@2557
   974
wenzelm@5726
   975
* Significantly faster resolution;
paulson@2557
   976
paulson@2557
   977
* the different sections in a .thy file can now be mixed and repeated
paulson@2557
   978
freely;
paulson@2557
   979
paulson@2557
   980
* Database of theorems for FOL, HOL and ZF.  New
paulson@2557
   981
commands including qed, qed_goal and bind_thm store theorems in the database.
paulson@2557
   982
paulson@2557
   983
* Simple database queries: return a named theorem (get_thm) or all theorems of
paulson@2557
   984
a given theory (thms_of), or find out what theory a theorem was proved in
paulson@2557
   985
(theory_of_thm);
paulson@2557
   986
paulson@2557
   987
* Bugs fixed in the inductive definition and datatype packages;
paulson@2557
   988
paulson@2557
   989
* The classical reasoner provides deepen_tac and depth_tac, making FOL_dup_cs
paulson@2557
   990
and HOL_dup_cs obsolete;
paulson@2557
   991
paulson@2557
   992
* Syntactic ambiguities caused by the new treatment of syntax in Isabelle94-1
paulson@2557
   993
have been removed;
paulson@2557
   994
paulson@2557
   995
* Simpler definition of function space in ZF;
paulson@2557
   996
paulson@2557
   997
* new results about cardinal and ordinal arithmetic in ZF;
paulson@2557
   998
paulson@2557
   999
* 'subtype' facility in HOL for introducing new types as subsets of existing
paulson@2557
  1000
types;
paulson@2557
  1001
paulson@2557
  1002
wenzelm@2553
  1003
$Id$