NEWS
author wenzelm
Mon Feb 08 17:29:08 1999 +0100 (1999-02-08)
changeset 6259 488bdc1bd11a
parent 6174 9fb306ded7e5
child 6269 dbb48b0744d3
permissions -rw-r--r--
path element specification '~~' refers to '$ISABELLE_HOME';
wenzelm@5363
     1
Isabelle NEWS -- history user-relevant changes
wenzelm@5363
     2
==============================================
wenzelm@2553
     3
wenzelm@4981
     4
New in this Isabelle version
wenzelm@4981
     5
----------------------------
oheimb@4649
     6
paulson@5931
     7
*** Overview of INCOMPATIBILITIES (see below for more details) ***
paulson@5931
     8
paulson@5931
     9
* HOL: Removed the obsolete syntax "Compl A"; use -A for set complement
paulson@5931
    10
paulson@6174
    11
* HOL: the predicate "inj" is now defined by translation to "inj_on"
paulson@6174
    12
paulson@6064
    13
* ZF: The con_defs part of an inductive definition may no longer refer to 
paulson@6064
    14
  constants declared in the same theory;
nipkow@6057
    15
paulson@6141
    16
* HOL, ZF: the function mk_cases, generated by the inductive definition 
paulson@6141
    17
  package, has lost an argument.  To simplify its result, it uses the default
paulson@6141
    18
  simpset instead of a supplied list of theorems.
paulson@6141
    19
nipkow@6057
    20
paulson@6069
    21
*** Proof tools ***
paulson@6069
    22
paulson@6069
    23
* Provers/Arith/fast_lin_arith.ML contains a functor for creating a decision
paulson@6069
    24
procedure for linear arithmetic. Currently it is used for types `nat' and
paulson@6069
    25
`int' in HOL (see below) but can, should and will be instantiated for other
paulson@6069
    26
types and logics as well.
paulson@6069
    27
paulson@6069
    28
paulson@6014
    29
*** General ***
paulson@6014
    30
paulson@6014
    31
* in locales, the "assumes" and "defines" parts may be omitted if empty;
wenzelm@5973
    32
oheimb@6028
    33
* new print_mode "xsymbols" for extended symbol support 
wenzelm@6259
    34
  (e.g. genuiene long arrows);
wenzelm@6259
    35
wenzelm@6259
    36
* path element specification '~~' refers to '$ISABELLE_HOME';
wenzelm@6259
    37
oheimb@6028
    38
nipkow@6057
    39
*** HOL ***
nipkow@6057
    40
nipkow@6063
    41
* There are now decision procedures for linear arithmetic over nat and int:
nipkow@6131
    42
nipkow@6131
    43
1. arith_tac copes with arbitrary formulae involving `=', `<', `<=', `+',
nipkow@6157
    44
`-', `Suc', `min', `max' and numerical constants; other subterms are treated
nipkow@6157
    45
as atomic; subformulae not involving type `nat' or `int' are ignored;
nipkow@6157
    46
quantified subformulae are ignored unless they are positive universal or
nipkow@6157
    47
negative existential. The tactic has to be invoked by hand and can be a
nipkow@6157
    48
little bit slow. In particular, the running time is exponential in the number
nipkow@6157
    49
of occurrences of `min' and `max', and `-' on `nat'.
nipkow@6131
    50
nipkow@6131
    51
2. fast_arith_tac is a cut-down version of arith_tac: it only takes (negated)
nipkow@6131
    52
(in)equalities among the premises and the conclusion into account (i.e. no
nipkow@6157
    53
compound formulae) and does not know about `min' and `max', and `-' on
nipkow@6157
    54
`nat'. It is fast and is used automatically by the simplifier.
nipkow@6131
    55
nipkow@6063
    56
NB: At the moment, these decision procedures do not cope with mixed nat/int
nipkow@6131
    57
formulae where the two parts interact, such as `m < n ==> int(m) < int(n)'.
oheimb@6028
    58
wenzelm@5973
    59
*** Internal programming interfaces ***
wenzelm@5781
    60
wenzelm@5781
    61
* tuned current_goals_markers semantics: begin / end goal avoids
wenzelm@5781
    62
printing empty lines;
wenzelm@5781
    63
wenzelm@5973
    64
* removed prs and prs_fn hook, which was broken because it did not
wenzelm@5973
    65
include \n in its semantics, forcing writeln to add one
wenzelm@5973
    66
uncoditionally; replaced prs_fn by writeln_fn; consider std_output:
wenzelm@5973
    67
string -> unit if you really want to output text without newline;
wenzelm@5973
    68
wenzelm@5781
    69
paulson@6064
    70
*** ZF ***
paulson@6064
    71
paulson@6064
    72
* new primrec section allows primitive recursive functions to be given
paulson@6070
    73
  directly (as in HOL) over datatypes and the natural numbers;
paulson@6064
    74
paulson@6064
    75
* new tactics induct_tac and exhaust_tac for induction (or case analysis)
paulson@6070
    76
  over datatypes and the natural numbers;
paulson@6064
    77
paulson@6064
    78
* the datatype declaration of type T now defines the recursor T_rec;
paulson@6064
    79
paulson@6141
    80
* simplification automatically does freeness reasoning for datatype
paulson@6141
    81
  constructors;
paulson@6141
    82
paulson@6155
    83
* automatic type-inference, with AddTCs command to insert new type-checking
paulson@6155
    84
  rules;
paulson@6155
    85
paulson@6155
    86
* datatype introduction rules are now added as Safe Introduction rules to
paulson@6155
    87
  the claset;
paulson@6155
    88
paulson@6069
    89
* The syntax "if P then x else y" is now available in addition to if(P,x,y).
paulson@6069
    90
paulson@6064
    91
wenzelm@5781
    92
New in Isabelle98-1 (October 1998)
wenzelm@5781
    93
----------------------------------
wenzelm@5781
    94
wenzelm@5127
    95
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4842
    96
wenzelm@5726
    97
* several changes of automated proof tools;
wenzelm@5373
    98
wenzelm@5726
    99
* HOL: major changes to the inductive and datatype packages, including
wenzelm@5726
   100
some minor incompatibilities of theory syntax;
berghofe@5214
   101
wenzelm@5726
   102
* HOL: renamed r^-1 to 'converse' from 'inverse'; 'inj_onto' is now
wenzelm@5217
   103
called `inj_on';
paulson@5160
   104
nipkow@5275
   105
* HOL: removed duplicate thms in Arith:
nipkow@5275
   106
  less_imp_add_less  should be replaced by  trans_less_add1
nipkow@5275
   107
  le_imp_add_le      should be replaced by  trans_le_add1
paulson@5160
   108
wenzelm@5726
   109
* HOL: unary minus is now overloaded (new type constraints may be
wenzelm@5726
   110
required);
paulson@5490
   111
wenzelm@5726
   112
* HOL and ZF: unary minus for integers is now #- instead of #~.  In
wenzelm@5726
   113
ZF, expressions such as n#-1 must be changed to n#- 1, since #-1 is
wenzelm@5726
   114
now taken as an integer constant.
paulson@5541
   115
wenzelm@5726
   116
* Pure: ML function 'theory_of' renamed to 'theory';
wenzelm@5397
   117
wenzelm@5363
   118
wenzelm@5127
   119
*** Proof tools ***
nipkow@4880
   120
nipkow@5657
   121
* Simplifier:
nipkow@5657
   122
  1. Asm_full_simp_tac is now more aggressive.
nipkow@5657
   123
     1. It will sometimes reorient premises if that increases their power to
nipkow@5657
   124
        simplify.
nipkow@5657
   125
     2. It does no longer proceed strictly from left to right but may also
nipkow@5657
   126
        rotate premises to achieve further simplification.
nipkow@5657
   127
     For compatibility reasons there is now Asm_lr_simp_tac which is like the
nipkow@5657
   128
     old Asm_full_simp_tac in that it does not rotate premises.
nipkow@5657
   129
  2. The simplifier now knows a little bit about nat-arithmetic.
nipkow@4880
   130
wenzelm@5127
   131
* Classical reasoner: wrapper mechanism for the classical reasoner now
wenzelm@5127
   132
allows for selected deletion of wrappers, by introduction of names for
wenzelm@5127
   133
wrapper functionals.  This implies that addbefore, addSbefore,
wenzelm@5127
   134
addaltern, and addSaltern now take a pair (name, tactic) as argument,
wenzelm@5127
   135
and that adding two tactics with the same name overwrites the first
wenzelm@5127
   136
one (emitting a warning).
oheimb@4824
   137
  type wrapper = (int -> tactic) -> (int -> tactic)
oheimb@4649
   138
  setWrapper, setSWrapper, compWrapper and compSWrapper are replaced by
oheimb@4824
   139
  addWrapper, addSWrapper: claset * (string * wrapper) -> claset
oheimb@4824
   140
  delWrapper, delSWrapper: claset *  string            -> claset
oheimb@4649
   141
  getWrapper is renamed to appWrappers, getSWrapper to appSWrappers;
oheimb@4649
   142
wenzelm@5705
   143
* Classical reasoner: addbefore/addSbefore now have APPEND/ORELSE
wenzelm@5726
   144
semantics; addbefore now affects only the unsafe part of step_tac
wenzelm@5726
   145
etc.; this affects addss/auto_tac/force_tac, so EXISTING PROOFS MAY
wenzelm@5726
   146
FAIL, but proofs should be fixable easily, e.g. by replacing Auto_tac
wenzelm@5726
   147
by Force_tac;
oheimb@5524
   148
wenzelm@5726
   149
* Classical reasoner: setwrapper to setWrapper and compwrapper to
wenzelm@5726
   150
compWrapper; added safe wrapper (and access functions for it);
oheimb@5524
   151
wenzelm@5127
   152
* HOL/split_all_tac is now much faster and fails if there is nothing
wenzelm@5726
   153
to split.  Some EXISTING PROOFS MAY REQUIRE ADAPTION because the order
wenzelm@5726
   154
and the names of the automatically generated variables have changed.
wenzelm@5726
   155
split_all_tac has moved within claset() from unsafe wrappers to safe
wenzelm@5726
   156
wrappers, which means that !!-bound variables are split much more
wenzelm@5726
   157
aggressively, and safe_tac and clarify_tac now split such variables.
wenzelm@5726
   158
If this splitting is not appropriate, use delSWrapper "split_all_tac".
wenzelm@5726
   159
Note: the same holds for record_split_tac, which does the job of
wenzelm@5726
   160
split_all_tac for record fields.
wenzelm@5127
   161
wenzelm@5726
   162
* HOL/Simplifier: Rewrite rules for case distinctions can now be added
wenzelm@5726
   163
permanently to the default simpset using Addsplits just like
wenzelm@5726
   164
Addsimps. They can be removed via Delsplits just like
wenzelm@5726
   165
Delsimps. Lower-case versions are also available.
wenzelm@5127
   166
wenzelm@5726
   167
* HOL/Simplifier: The rule split_if is now part of the default
wenzelm@5726
   168
simpset. This means that the simplifier will eliminate all occurrences
wenzelm@5726
   169
of if-then-else in the conclusion of a goal. To prevent this, you can
wenzelm@5726
   170
either remove split_if completely from the default simpset by
wenzelm@5726
   171
`Delsplits [split_if]' or remove it in a specific call of the
wenzelm@5726
   172
simplifier using `... delsplits [split_if]'.  You can also add/delete
wenzelm@5726
   173
other case splitting rules to/from the default simpset: every datatype
wenzelm@5726
   174
generates suitable rules `split_t_case' and `split_t_case_asm' (where
wenzelm@5726
   175
t is the name of the datatype).
wenzelm@5127
   176
wenzelm@5726
   177
* Classical reasoner / Simplifier combination: new force_tac (and
wenzelm@5127
   178
derivatives Force_tac, force) combines rewriting and classical
wenzelm@5127
   179
reasoning (and whatever other tools) similarly to auto_tac, but is
wenzelm@5726
   180
aimed to solve the given subgoal completely.
wenzelm@5127
   181
wenzelm@5127
   182
wenzelm@5127
   183
*** General ***
wenzelm@5127
   184
wenzelm@5217
   185
* new top-level commands `Goal' and `Goalw' that improve upon `goal'
wenzelm@5127
   186
and `goalw': the theory is no longer needed as an explicit argument -
wenzelm@5127
   187
the current theory context is used; assumptions are no longer returned
wenzelm@5127
   188
at the ML-level unless one of them starts with ==> or !!; it is
wenzelm@5217
   189
recommended to convert to these new commands using isatool fixgoal
wenzelm@5217
   190
(backup your sources first!);
wenzelm@4842
   191
wenzelm@5217
   192
* new top-level commands 'thm' and 'thms' for retrieving theorems from
wenzelm@5207
   193
the current theory context, and 'theory' to lookup stored theories;
paulson@4806
   194
paulson@5722
   195
* new theory section 'locale' for declaring constants, assumptions and
paulson@5722
   196
definitions that have local scope;
paulson@5722
   197
wenzelm@5127
   198
* new theory section 'nonterminals' for purely syntactic types;
wenzelm@4858
   199
wenzelm@5127
   200
* new theory section 'setup' for generic ML setup functions
wenzelm@5127
   201
(e.g. package initialization);
wenzelm@4869
   202
wenzelm@5131
   203
* the distribution now includes Isabelle icons: see
wenzelm@5131
   204
lib/logo/isabelle-{small,tiny}.xpm;
wenzelm@5131
   205
wenzelm@5363
   206
* isatool install - install binaries with absolute references to
wenzelm@5363
   207
ISABELLE_HOME/bin;
wenzelm@5363
   208
wenzelm@5572
   209
* isatool logo -- create instances of the Isabelle logo (as EPS);
wenzelm@5572
   210
wenzelm@5407
   211
* print mode 'emacs' reserved for Isamode;
wenzelm@5407
   212
wenzelm@5726
   213
* support multiple print (ast) translations per constant name;
wenzelm@5726
   214
wenzelm@4711
   215
paulson@4661
   216
*** HOL ***
paulson@4661
   217
wenzelm@5710
   218
* there is now a tutorial on Isabelle/HOL (do 'isatool doc tutorial');
nipkow@5709
   219
wenzelm@5217
   220
* HOL/inductive package reorganized and improved: now supports mutual
paulson@5267
   221
definitions such as
wenzelm@5217
   222
wenzelm@5217
   223
  inductive EVEN ODD
wenzelm@5217
   224
    intrs
wenzelm@5217
   225
      null "0 : EVEN"
wenzelm@5217
   226
      oddI "n : EVEN ==> Suc n : ODD"
wenzelm@5217
   227
      evenI "n : ODD ==> Suc n : EVEN"
wenzelm@5217
   228
wenzelm@5217
   229
new theorem list "elims" contains an elimination rule for each of the
wenzelm@5217
   230
recursive sets; inductive definitions now handle disjunctive premises
wenzelm@5217
   231
correctly (also ZF);
berghofe@5214
   232
wenzelm@5217
   233
INCOMPATIBILITIES: requires Inductive as an ancestor; component
wenzelm@5217
   234
"mutual_induct" no longer exists - the induction rule is always
wenzelm@5217
   235
contained in "induct";
wenzelm@5217
   236
wenzelm@5217
   237
wenzelm@5217
   238
* HOL/datatype package re-implemented and greatly improved: now
paulson@5267
   239
supports mutually recursive datatypes such as
wenzelm@5217
   240
wenzelm@5217
   241
  datatype
wenzelm@5217
   242
    'a aexp = IF_THEN_ELSE ('a bexp) ('a aexp) ('a aexp)
wenzelm@5217
   243
            | SUM ('a aexp) ('a aexp)
wenzelm@5217
   244
            | DIFF ('a aexp) ('a aexp)
wenzelm@5217
   245
            | NUM 'a
wenzelm@5217
   246
  and
wenzelm@5217
   247
    'a bexp = LESS ('a aexp) ('a aexp)
wenzelm@5217
   248
            | AND ('a bexp) ('a bexp)
wenzelm@5217
   249
            | OR ('a bexp) ('a bexp)
wenzelm@5217
   250
paulson@5267
   251
as well as indirectly recursive datatypes such as
berghofe@5214
   252
wenzelm@5217
   253
  datatype
wenzelm@5217
   254
    ('a, 'b) term = Var 'a
wenzelm@5217
   255
                  | App 'b ((('a, 'b) term) list)
berghofe@5214
   256
wenzelm@5217
   257
The new tactic  mutual_induct_tac [<var_1>, ..., <var_n>] i  performs
wenzelm@5217
   258
induction on mutually / indirectly recursive datatypes.
wenzelm@5217
   259
wenzelm@5217
   260
Primrec equations are now stored in theory and can be accessed via
wenzelm@5217
   261
<function_name>.simps.
wenzelm@5217
   262
wenzelm@5217
   263
INCOMPATIBILITIES:
berghofe@5214
   264
wenzelm@5217
   265
  - Theories using datatypes must now have theory Datatype as an
wenzelm@5217
   266
    ancestor.
wenzelm@5217
   267
  - The specific <typename>.induct_tac no longer exists - use the
wenzelm@5217
   268
    generic induct_tac instead.
berghofe@5226
   269
  - natE has been renamed to nat.exhaust - use exhaust_tac
wenzelm@5217
   270
    instead of res_inst_tac ... natE. Note that the variable
berghofe@5226
   271
    names in nat.exhaust differ from the names in natE, this
wenzelm@5217
   272
    may cause some "fragile" proofs to fail.
wenzelm@5217
   273
  - The theorems split_<typename>_case and split_<typename>_case_asm
wenzelm@5217
   274
    have been renamed to <typename>.split and <typename>.split_asm.
wenzelm@5217
   275
  - Since default sorts of type variables are now handled correctly,
wenzelm@5217
   276
    some datatype definitions may have to be annotated with explicit
wenzelm@5217
   277
    sort constraints.
wenzelm@5217
   278
  - Primrec definitions no longer require function name and type
wenzelm@5217
   279
    of recursive argument.
berghofe@5214
   280
wenzelm@5217
   281
Consider using isatool fixdatatype to adapt your theories and proof
wenzelm@5217
   282
scripts to the new package (backup your sources first!).
wenzelm@5217
   283
wenzelm@5217
   284
wenzelm@5726
   285
* HOL/record package: considerably improved implementation; now
wenzelm@5726
   286
includes concrete syntax for record types, terms, updates; theorems
wenzelm@5726
   287
for surjective pairing and splitting !!-bound record variables; proof
wenzelm@5726
   288
support is as follows:
wenzelm@5726
   289
wenzelm@5726
   290
  1) standard conversions (selectors or updates applied to record
wenzelm@5726
   291
constructor terms) are part of the standard simpset;
wenzelm@5726
   292
wenzelm@5726
   293
  2) inject equations of the form ((x, y) = (x', y')) == x=x' & y=y' are
wenzelm@5726
   294
made part of standard simpset and claset via addIffs;
wenzelm@5726
   295
wenzelm@5726
   296
  3) a tactic for record field splitting (record_split_tac) is part of
wenzelm@5726
   297
the standard claset (addSWrapper);
wenzelm@5726
   298
wenzelm@5726
   299
To get a better idea about these rules you may retrieve them via
wenzelm@5726
   300
something like 'thms "foo.simps"' or 'thms "foo.iffs"', where "foo" is
wenzelm@5726
   301
the name of your record type.
wenzelm@5726
   302
wenzelm@5726
   303
The split tactic 3) conceptually simplifies by the following rule:
wenzelm@5726
   304
wenzelm@5726
   305
  "(!!x. PROP ?P x) == (!!a b. PROP ?P (a, b))"
wenzelm@5726
   306
wenzelm@5726
   307
Thus any record variable that is bound by meta-all will automatically
wenzelm@5726
   308
blow up into some record constructor term, consequently the
wenzelm@5726
   309
simplifications of 1), 2) apply.  Thus force_tac, auto_tac etc. shall
wenzelm@5726
   310
solve record problems automatically.
wenzelm@5726
   311
berghofe@5214
   312
wenzelm@5125
   313
* reorganized the main HOL image: HOL/Integ and String loaded by
wenzelm@5125
   314
default; theory Main includes everything;
wenzelm@5125
   315
paulson@5650
   316
* automatic simplification of integer sums and comparisons, using cancellation;
paulson@5650
   317
oheimb@5526
   318
* added option_map_eq_Some and not_Some_eq to the default simpset and claset;
wenzelm@5127
   319
wenzelm@5127
   320
* added disj_not1 = "(~P | Q) = (P --> Q)" to the default simpset;
wenzelm@5127
   321
wenzelm@5127
   322
* many new identities for unions, intersections, set difference, etc.;
wenzelm@5127
   323
wenzelm@5127
   324
* expand_if, expand_split, expand_sum_case and expand_nat_case are now
wenzelm@5127
   325
called split_if, split_split, split_sum_case and split_nat_case (to go
wenzelm@5127
   326
with add/delsplits);
wenzelm@5125
   327
wenzelm@5127
   328
* HOL/Prod introduces simplification procedure unit_eq_proc rewriting
wenzelm@5127
   329
(?x::unit) = (); this is made part of the default simpset, which COULD
wenzelm@5127
   330
MAKE EXISTING PROOFS FAIL under rare circumstances (consider
wenzelm@5207
   331
'Delsimprocs [unit_eq_proc];' as last resort); also note that
wenzelm@5207
   332
unit_abs_eta_conv is added in order to counter the effect of
wenzelm@5207
   333
unit_eq_proc on (%u::unit. f u), replacing it by f rather than by
wenzelm@5207
   334
%u.f();
wenzelm@5125
   335
wenzelm@5217
   336
* HOL/Fun INCOMPATIBILITY: `inj_onto' is now called `inj_on' (which
wenzelm@5217
   337
makes more sense);
berghofe@5109
   338
paulson@5475
   339
* HOL/Set INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
   340
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
   341
  disjointness reasoning but breaking a few old proofs.
paulson@5267
   342
wenzelm@5217
   343
* HOL/Relation INCOMPATIBILITY: renamed the relational operator r^-1
wenzelm@5217
   344
to 'converse' from 'inverse' (for compatibility with ZF and some
wenzelm@5217
   345
literature);
wenzelm@5085
   346
wenzelm@5127
   347
* HOL/recdef can now declare non-recursive functions, with {} supplied as
wenzelm@5127
   348
the well-founded relation;
oheimb@4838
   349
paulson@5490
   350
* HOL/Set INCOMPATIBILITY: the complement of set A is now written -A instead of
paulson@5490
   351
    Compl A.  The "Compl" syntax remains available as input syntax for this
paulson@5490
   352
    release ONLY.
paulson@5490
   353
wenzelm@5127
   354
* HOL/Update: new theory of function updates:
wenzelm@5127
   355
    f(a:=b) == %x. if x=a then b else f x
wenzelm@5127
   356
may also be iterated as in f(a:=b,c:=d,...);
nipkow@5077
   357
wenzelm@5127
   358
* HOL/Vimage: new theory for inverse image of a function, syntax f-``B;
paulson@4899
   359
nipkow@5282
   360
* HOL/List:
nipkow@5282
   361
  - new function list_update written xs[i:=v] that updates the i-th
nipkow@5282
   362
    list position. May also be iterated as in xs[i:=a,j:=b,...].
nipkow@5428
   363
  - new function `upt' written [i..j(] which generates the list
nipkow@5428
   364
    [i,i+1,...,j-1], i.e. the upper bound is excluded. To include the upper
nipkow@5428
   365
    bound write [i..j], which is a shorthand for [i..j+1(].
nipkow@5282
   366
  - new lexicographic orderings and corresponding wellfoundedness theorems.
paulson@4779
   367
wenzelm@5127
   368
* HOL/Arith:
wenzelm@5127
   369
  - removed 'pred' (predecessor) function;
wenzelm@5127
   370
  - generalized some theorems about n-1;
wenzelm@5127
   371
  - many new laws about "div" and "mod";
wenzelm@5127
   372
  - new laws about greatest common divisors (see theory ex/Primes);
oheimb@4766
   373
wenzelm@5127
   374
* HOL/Relation: renamed the relational operator r^-1 "converse"
wenzelm@4842
   375
instead of "inverse";
wenzelm@4711
   376
nipkow@5651
   377
* HOL/Induct/Multiset: a theory of multisets, including the wellfoundedness
nipkow@5651
   378
  of the multiset ordering;
nipkow@5651
   379
wenzelm@5127
   380
* directory HOL/Real: a construction of the reals using Dedekind cuts
nipkow@5651
   381
  (not included by default);
nipkow@4835
   382
wenzelm@5127
   383
* directory HOL/UNITY: Chandy and Misra's UNITY formalism;
wenzelm@4711
   384
nipkow@5651
   385
* directory HOL/Hoare: a new version of Hoare logic which permits many-sorted
nipkow@5651
   386
  programs, i.e. different program variables may have different types.
nipkow@5651
   387
paulson@5142
   388
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
   389
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
   390
  Now rew can involve either definitions or equalities (either == or =).
wenzelm@5002
   391
wenzelm@5363
   392
paulson@4879
   393
*** ZF ***
paulson@4879
   394
paulson@5332
   395
* theory Main includes everything; INCOMPATIBILITY: theory ZF.thy contains
paulson@5332
   396
  only the theorems proved on ZF.ML;
paulson@5160
   397
paulson@5475
   398
* ZF INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
   399
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
   400
  disjointness reasoning but breaking a few old proofs.
paulson@5267
   401
paulson@5160
   402
* ZF/Update: new theory of function updates
paulson@5160
   403
    with default rewrite rule  f(x:=y) ` z = if(z=x, y, f`z)
paulson@5160
   404
  may also be iterated as in f(a:=b,c:=d,...);
paulson@5160
   405
paulson@4879
   406
* in  let x=t in u(x), neither t nor u(x) has to be an FOL term.
oheimb@4649
   407
paulson@5142
   408
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
   409
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
   410
  Now rew can involve either definitions or equalities (either == or =).
paulson@5142
   411
paulson@5160
   412
* case_tac provided for compatibility with HOL
paulson@5160
   413
    (like the old excluded_middle_tac, but with subgoals swapped)
paulson@5160
   414
wenzelm@4842
   415
wenzelm@5127
   416
*** Internal programming interfaces ***
wenzelm@5002
   417
wenzelm@5251
   418
* Pure: several new basic modules made available for general use, see
wenzelm@5251
   419
also src/Pure/README;
wenzelm@5207
   420
wenzelm@5008
   421
* improved the theory data mechanism to support encapsulation (data
wenzelm@5008
   422
kind name replaced by private Object.kind, acting as authorization
wenzelm@5373
   423
key); new type-safe user interface via functor TheoryDataFun; generic
wenzelm@5373
   424
print_data function becomes basically useless;
wenzelm@5002
   425
wenzelm@5251
   426
* removed global_names compatibility flag -- all theory declarations
wenzelm@5251
   427
are qualified by default;
wenzelm@5251
   428
wenzelm@5085
   429
* module Pure/Syntax now offers quote / antiquote translation
wenzelm@5085
   430
functions (useful for Hoare logic etc. with implicit dependencies);
wenzelm@5373
   431
see HOL/ex/Antiquote for an example use;
wenzelm@5085
   432
wenzelm@5127
   433
* Simplifier now offers conversions (asm_)(full_)rewrite: simpset ->
wenzelm@5127
   434
cterm -> thm;
wenzelm@5127
   435
wenzelm@5207
   436
* new tactical CHANGED_GOAL for checking that a tactic modifies a
wenzelm@5207
   437
subgoal;
paulson@5142
   438
wenzelm@5251
   439
* Display.print_goals function moved to Locale.print_goals;
wenzelm@5251
   440
wenzelm@5731
   441
* standard print function for goals supports current_goals_markers
wenzelm@5731
   442
variable for marking begin of proof, end of proof, start of goal; the
wenzelm@5731
   443
default is ("", "", ""); setting current_goals_markers := ("<proof>",
wenzelm@5731
   444
"</proof>", "<goal>") causes SGML like tagged proof state printing,
wenzelm@5731
   445
for example;
wenzelm@5731
   446
wenzelm@5002
   447
wenzelm@5002
   448
wenzelm@4410
   449
New in Isabelle98 (January 1998)
wenzelm@4410
   450
--------------------------------
wenzelm@4410
   451
wenzelm@4410
   452
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4410
   453
wenzelm@4410
   454
* changed lexical syntax of terms / types: dots made part of long
wenzelm@4410
   455
identifiers, e.g. "%x.x" no longer possible, should be "%x. x";
wenzelm@4410
   456
wenzelm@4410
   457
* simpset (and claset) reference variable replaced by functions
wenzelm@4410
   458
simpset / simpset_ref;
wenzelm@4410
   459
wenzelm@4410
   460
* no longer supports theory aliases (via merge) and non-trivial
wenzelm@4410
   461
implicit merge of thms' signatures;
wenzelm@4410
   462
wenzelm@4410
   463
* most internal names of constants changed due to qualified names;
wenzelm@4410
   464
wenzelm@4410
   465
* changed Pure/Sequence interface (see Pure/seq.ML);
wenzelm@4410
   466
wenzelm@3454
   467
paulson@3715
   468
*** General Changes ***
paulson@3715
   469
wenzelm@4174
   470
* hierachically structured name spaces (for consts, types, axms, thms
wenzelm@3943
   471
etc.); new lexical class 'longid' (e.g. Foo.bar.x) may render much of
wenzelm@4108
   472
old input syntactically incorrect (e.g. "%x.x"); COMPATIBILITY:
wenzelm@4108
   473
isatool fixdots ensures space after dots (e.g. "%x. x"); set
wenzelm@4174
   474
long_names for fully qualified output names; NOTE: ML programs
wenzelm@4174
   475
(special tactics, packages etc.) referring to internal names may have
wenzelm@4174
   476
to be adapted to cope with fully qualified names; in case of severe
wenzelm@4174
   477
backward campatibility problems try setting 'global_names' at compile
wenzelm@4174
   478
time to have enrything declared within a flat name space; one may also
wenzelm@4174
   479
fine tune name declarations in theories via the 'global' and 'local'
wenzelm@4174
   480
section;
wenzelm@4108
   481
wenzelm@4108
   482
* reimplemented the implicit simpset and claset using the new anytype
wenzelm@4108
   483
data filed in signatures; references simpset:simpset ref etc. are
wenzelm@4108
   484
replaced by functions simpset:unit->simpset and
wenzelm@4108
   485
simpset_ref:unit->simpset ref; COMPATIBILITY: use isatool fixclasimp
wenzelm@4108
   486
to patch your ML files accordingly;
paulson@3856
   487
wenzelm@3857
   488
* HTML output now includes theory graph data for display with Java
wenzelm@3857
   489
applet or isatool browser; data generated automatically via isatool
wenzelm@3901
   490
usedir (see -i option, ISABELLE_USEDIR_OPTIONS);
wenzelm@3857
   491
paulson@3856
   492
* defs may now be conditional; improved rewrite_goals_tac to handle
paulson@3856
   493
conditional equations;
paulson@3856
   494
wenzelm@4174
   495
* defs now admits additional type arguments, using TYPE('a) syntax;
wenzelm@4174
   496
wenzelm@3901
   497
* theory aliases via merge (e.g. M=A+B+C) no longer supported, always
wenzelm@3901
   498
creates a new theory node; implicit merge of thms' signatures is
wenzelm@4112
   499
restricted to 'trivial' ones; COMPATIBILITY: one may have to use
wenzelm@3901
   500
transfer:theory->thm->thm in (rare) cases;
wenzelm@3901
   501
wenzelm@3968
   502
* improved handling of draft signatures / theories; draft thms (and
wenzelm@3968
   503
ctyps, cterms) are automatically promoted to real ones;
wenzelm@3968
   504
wenzelm@3901
   505
* slightly changed interfaces for oracles: admit many per theory, named
wenzelm@3901
   506
(e.g. oracle foo = mlfun), additional name argument for invoke_oracle;
wenzelm@3901
   507
wenzelm@3901
   508
* print_goals: optional output of const types (set show_consts and
wenzelm@3901
   509
show_types);
wenzelm@3851
   510
wenzelm@4388
   511
* improved output of warnings (###) and errors (***);
wenzelm@3697
   512
paulson@4178
   513
* subgoal_tac displays a warning if the new subgoal has type variables;
paulson@4178
   514
paulson@3715
   515
* removed old README and Makefiles;
wenzelm@3697
   516
paulson@3856
   517
* replaced print_goals_ref hook by print_current_goals_fn and result_error_fn;
wenzelm@3670
   518
paulson@3715
   519
* removed obsolete init_pps and init_database;
paulson@3715
   520
paulson@3715
   521
* deleted the obsolete tactical STATE, which was declared by
paulson@3715
   522
    fun STATE tacfun st = tacfun st st;
paulson@3715
   523
wenzelm@4388
   524
* cd and use now support path variables, e.g. $ISABELLE_HOME, or ~
wenzelm@4388
   525
(which abbreviates $HOME);
wenzelm@4269
   526
wenzelm@4269
   527
* changed Pure/Sequence interface (see Pure/seq.ML); COMPATIBILITY:
wenzelm@4269
   528
use isatool fixseq to adapt your ML programs (this works for fully
wenzelm@4269
   529
qualified references to the Sequence structure only!);
wenzelm@4269
   530
wenzelm@4381
   531
* use_thy no longer requires writable current directory; it always
wenzelm@4381
   532
reloads .ML *and* .thy file, if either one is out of date;
wenzelm@4269
   533
paulson@3715
   534
paulson@3715
   535
*** Classical Reasoner ***
paulson@3715
   536
wenzelm@3744
   537
* Clarify_tac, clarify_tac, clarify_step_tac, Clarify_step_tac: new
wenzelm@3744
   538
tactics that use classical reasoning to simplify a subgoal without
wenzelm@3744
   539
splitting it into several subgoals;
paulson@3715
   540
paulson@3719
   541
* Safe_tac: like safe_tac but uses the default claset;
paulson@3719
   542
paulson@3715
   543
paulson@3715
   544
*** Simplifier ***
paulson@3715
   545
paulson@3715
   546
* added simplification meta rules:
paulson@3715
   547
    (asm_)(full_)simplify: simpset -> thm -> thm;
paulson@3715
   548
paulson@3715
   549
* simplifier.ML no longer part of Pure -- has to be loaded by object
paulson@3715
   550
logics (again);
paulson@3715
   551
paulson@3715
   552
* added prems argument to simplification procedures;
paulson@3715
   553
paulson@4325
   554
* HOL, FOL, ZF: added infix function `addsplits':
paulson@4325
   555
  instead of `<simpset> setloop (split_tac <thms>)'
paulson@4325
   556
  you can simply write `<simpset> addsplits <thms>'
paulson@4325
   557
paulson@3715
   558
paulson@3715
   559
*** Syntax ***
paulson@3715
   560
wenzelm@4174
   561
* TYPE('a) syntax for type reflection terms;
wenzelm@4174
   562
wenzelm@3985
   563
* no longer handles consts with name "" -- declare as 'syntax' instead;
paulson@3856
   564
paulson@3856
   565
* pretty printer: changed order of mixfix annotation preference (again!);
wenzelm@3846
   566
paulson@3715
   567
* Pure: fixed idt/idts vs. pttrn/pttrns syntactic categories;
paulson@3715
   568
paulson@3715
   569
paulson@3715
   570
*** HOL ***
paulson@3715
   571
wenzelm@5726
   572
* HOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
   573
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
   574
nipkow@4035
   575
* HOL/TLA: Stephan Merz's formalization of Lamport's Temporal Logic of Actions;
wenzelm@3985
   576
wenzelm@3985
   577
* HOL/Auth: new protocol proofs including some for the Internet
nipkow@4035
   578
  protocol TLS;
wenzelm@3985
   579
wenzelm@4125
   580
* HOL/Map: new theory of `maps' a la VDM;
nipkow@3982
   581
wenzelm@4335
   582
* HOL/simplifier: simplification procedures nat_cancel_sums for
wenzelm@4335
   583
cancelling out common nat summands from =, <, <= (in)equalities, or
wenzelm@4335
   584
differences; simplification procedures nat_cancel_factor for
wenzelm@4335
   585
cancelling common factor from =, <, <= (in)equalities over natural
wenzelm@4373
   586
sums; nat_cancel contains both kinds of procedures, it is installed by
wenzelm@4373
   587
default in Arith.thy -- this COULD MAKE EXISTING PROOFS FAIL;
wenzelm@4335
   588
nipkow@3580
   589
* HOL/simplifier: terms of the form
paulson@4325
   590
  `? x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x)'  (or t=x)
nipkow@3580
   591
  are rewritten to
nipkow@4035
   592
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t)',
nipkow@4035
   593
  and those of the form
paulson@4325
   594
  `! x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x) --> R(x)'  (or t=x)
nipkow@4035
   595
  are rewritten to
nipkow@4035
   596
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t) --> R(t)',
nipkow@4035
   597
nipkow@4035
   598
* HOL/datatype
nipkow@4035
   599
  Each datatype `t' now comes with a theorem `split_t_case' of the form
nipkow@3580
   600
nipkow@4035
   601
  P(t_case f1 ... fn x) =
nipkow@4035
   602
     ( (!y1 ... ym1. x = C1 y1 ... ym1 --> P(f1 y1 ... ym1)) &
nipkow@4035
   603
        ...
oheimb@4189
   604
       (!y1 ... ymn. x = Cn y1 ... ymn --> P(f1 y1 ... ymn))
nipkow@4035
   605
     )
nipkow@4035
   606
oheimb@4930
   607
  and a theorem `split_t_case_asm' of the form
oheimb@4189
   608
oheimb@4189
   609
  P(t_case f1 ... fn x) =
oheimb@4189
   610
    ~( (? y1 ... ym1. x = C1 y1 ... ym1 & ~P(f1 y1 ... ym1)) |
oheimb@4189
   611
        ...
oheimb@4189
   612
       (? y1 ... ymn. x = Cn y1 ... ymn & ~P(f1 y1 ... ymn))
oheimb@4189
   613
     )
oheimb@4930
   614
  which can be added to a simpset via `addsplits'. The existing theorems
oheimb@4930
   615
  expand_list_case and expand_option_case have been renamed to
oheimb@4930
   616
  split_list_case and split_option_case.
oheimb@4189
   617
nipkow@4361
   618
* HOL/Arithmetic:
nipkow@4361
   619
  - `pred n' is automatically converted to `n-1'.
nipkow@4361
   620
    Users are strongly encouraged not to use `pred' any longer,
nipkow@4361
   621
    because it will disappear altogether at some point.
nipkow@4361
   622
  - Users are strongly encouraged to write "0 < n" rather than
nipkow@4361
   623
    "n ~= 0". Theorems and proof tools have been modified towards this
nipkow@4361
   624
    `standard'.
nipkow@4357
   625
nipkow@4502
   626
* HOL/Lists:
nipkow@4502
   627
  the function "set_of_list" has been renamed "set" (and its theorems too);
nipkow@4502
   628
  the function "nth" now takes its arguments in the reverse order and
nipkow@4502
   629
  has acquired the infix notation "!" as in "xs!n".
paulson@3570
   630
paulson@4154
   631
* HOL/Set: UNIV is now a constant and is no longer translated to Compl{};
paulson@4154
   632
paulson@4154
   633
* HOL/Set: The operator (UN x.B x) now abbreviates (UN x:UNIV. B x) and its
paulson@4154
   634
  specialist theorems (like UN1_I) are gone.  Similarly for (INT x.B x);
paulson@4154
   635
wenzelm@4575
   636
* HOL/record: extensible records with schematic structural subtyping
wenzelm@4575
   637
(single inheritance); EXPERIMENTAL version demonstrating the encoding,
wenzelm@4575
   638
still lacks various theorems and concrete record syntax;
wenzelm@4575
   639
wenzelm@4125
   640
paulson@3715
   641
*** HOLCF ***
wenzelm@3535
   642
wenzelm@4125
   643
* removed "axioms" and "generated by" sections;
wenzelm@4125
   644
oheimb@4123
   645
* replaced "ops" section by extended "consts" section, which is capable of
wenzelm@4125
   646
  handling the continuous function space "->" directly;
wenzelm@4125
   647
wenzelm@4125
   648
* domain package:
wenzelm@4125
   649
  . proves theorems immediately and stores them in the theory,
wenzelm@4125
   650
  . creates hierachical name space,
wenzelm@4125
   651
  . now uses normal mixfix annotations (instead of cinfix...),
wenzelm@4125
   652
  . minor changes to some names and values (for consistency),
wenzelm@4125
   653
  . e.g. cases -> casedist, dists_eq -> dist_eqs, [take_lemma] -> take_lemmas,
wenzelm@4125
   654
  . separator between mutual domain defs: changed "," to "and",
wenzelm@4125
   655
  . improved handling of sort constraints;  now they have to
wenzelm@4125
   656
    appear on the left-hand side of the equations only;
oheimb@4123
   657
oheimb@4123
   658
* fixed LAM <x,y,zs>.b syntax;
wenzelm@3567
   659
wenzelm@3744
   660
* added extended adm_tac to simplifier in HOLCF -- can now discharge
wenzelm@3744
   661
adm (%x. P (t x)), where P is chainfinite and t continuous;
wenzelm@3579
   662
wenzelm@3579
   663
paulson@3719
   664
*** FOL and ZF ***
paulson@3719
   665
wenzelm@5726
   666
* FOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
   667
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
   668
wenzelm@3744
   669
* qed_spec_mp, qed_goal_spec_mp, qed_goalw_spec_mp are available, as
wenzelm@3744
   670
in HOL, they strip ALL and --> from proved theorems;
wenzelm@3744
   671
paulson@3719
   672
wenzelm@3579
   673
wenzelm@3006
   674
New in Isabelle94-8 (May 1997)
wenzelm@3006
   675
------------------------------
wenzelm@2654
   676
paulson@3002
   677
*** General Changes ***
paulson@3002
   678
paulson@3002
   679
* new utilities to build / run / maintain Isabelle etc. (in parts
paulson@3002
   680
still somewhat experimental); old Makefiles etc. still functional;
wenzelm@2971
   681
wenzelm@3205
   682
* new 'Isabelle System Manual';
wenzelm@3205
   683
wenzelm@2825
   684
* INSTALL text, together with ./configure and ./build scripts;
wenzelm@2773
   685
wenzelm@3006
   686
* reimplemented type inference for greater efficiency, better error
wenzelm@3006
   687
messages and clean internal interface;
paulson@3002
   688
paulson@3002
   689
* prlim command for dealing with lots of subgoals (an easier way of
paulson@3002
   690
setting goals_limit);
paulson@3002
   691
wenzelm@3006
   692
wenzelm@3006
   693
*** Syntax ***
paulson@3002
   694
wenzelm@3116
   695
* supports alternative (named) syntax tables (parser and pretty
wenzelm@3116
   696
printer); internal interface is provided by add_modesyntax(_i);
wenzelm@3116
   697
paulson@3002
   698
* Pure, FOL, ZF, HOL, HOLCF now support symbolic input and output; to
paulson@3002
   699
be used in conjunction with the Isabelle symbol font; uses the
paulson@3002
   700
"symbols" syntax table;
paulson@3002
   701
wenzelm@2705
   702
* added token_translation interface (may translate name tokens in
wenzelm@2756
   703
arbitrary ways, dependent on their type (free, bound, tfree, ...) and
wenzelm@3116
   704
the current print_mode); IMPORTANT: user print translation functions
wenzelm@3116
   705
are responsible for marking newly introduced bounds
wenzelm@3116
   706
(Syntax.mark_boundT);
wenzelm@2705
   707
wenzelm@2730
   708
* token translations for modes "xterm" and "xterm_color" that display
wenzelm@3006
   709
names in bold, underline etc. or colors (which requires a color
wenzelm@3006
   710
version of xterm);
wenzelm@2730
   711
paulson@3002
   712
* infixes may now be declared with names independent of their syntax;
paulson@3002
   713
paulson@3002
   714
* added typed_print_translation (like print_translation, but may
paulson@3002
   715
access type of constant);
paulson@3002
   716
wenzelm@3006
   717
paulson@3002
   718
*** Classical Reasoner ***
paulson@3002
   719
paulson@3002
   720
Blast_tac: a new tactic!  It is often more powerful than fast_tac, but has
paulson@3002
   721
some limitations.  Blast_tac...
paulson@3002
   722
  + ignores addss, addbefore, addafter; this restriction is intrinsic
paulson@3002
   723
  + ignores elimination rules that don't have the correct format
wenzelm@5726
   724
        (the conclusion MUST be a formula variable)
paulson@3002
   725
  + ignores types, which can make HOL proofs fail
paulson@3002
   726
  + rules must not require higher-order unification, e.g. apply_type in ZF
paulson@3002
   727
    [message "Function Var's argument not a bound variable" relates to this]
paulson@3002
   728
  + its proof strategy is more general but can actually be slower
paulson@3002
   729
wenzelm@3107
   730
* substitution with equality assumptions no longer permutes other
wenzelm@3107
   731
assumptions;
paulson@3002
   732
paulson@3002
   733
* minor changes in semantics of addafter (now called addaltern); renamed
paulson@3002
   734
setwrapper to setWrapper and compwrapper to compWrapper; added safe wrapper
wenzelm@3107
   735
(and access functions for it);
paulson@3002
   736
wenzelm@5726
   737
* improved combination of classical reasoner and simplifier:
oheimb@3317
   738
  + functions for handling clasimpsets
oheimb@3317
   739
  + improvement of addss: now the simplifier is called _after_ the
oheimb@3317
   740
    safe steps.
oheimb@3317
   741
  + safe variant of addss called addSss: uses safe simplifications
wenzelm@5726
   742
    _during_ the safe steps. It is more complete as it allows multiple
oheimb@3317
   743
    instantiations of unknowns (e.g. with slow_tac).
wenzelm@3006
   744
paulson@3002
   745
*** Simplifier ***
paulson@3002
   746
wenzelm@3006
   747
* added interface for simplification procedures (functions that
wenzelm@3006
   748
produce *proven* rewrite rules on the fly, depending on current
wenzelm@3006
   749
redex);
wenzelm@3006
   750
wenzelm@3006
   751
* ordering on terms as parameter (used for ordered rewriting);
wenzelm@3006
   752
wenzelm@3107
   753
* new functions delcongs, deleqcongs, and Delcongs. richer rep_ss;
paulson@3002
   754
paulson@3002
   755
* the solver is now split into a safe and an unsafe part.
paulson@3002
   756
This should be invisible for the normal user, except that the
paulson@3002
   757
functions setsolver and addsolver have been renamed to setSolver and
wenzelm@3107
   758
addSolver; added safe_asm_full_simp_tac;
paulson@3002
   759
paulson@3002
   760
paulson@3002
   761
*** HOL ***
paulson@3002
   762
nipkow@3042
   763
* a generic induction tactic `induct_tac' which works for all datatypes and
wenzelm@3107
   764
also for type `nat';
nipkow@3042
   765
nipkow@3316
   766
* a generic case distinction tactic `exhaust_tac' which works for all
nipkow@3316
   767
datatypes and also for type `nat';
nipkow@3316
   768
nipkow@3316
   769
* each datatype comes with a function `size';
nipkow@3316
   770
paulson@3002
   771
* patterns in case expressions allow tuple patterns as arguments to
wenzelm@3107
   772
constructors, for example `case x of [] => ... | (x,y,z)#ps => ...';
paulson@3002
   773
paulson@3002
   774
* primrec now also works with type nat;
paulson@3002
   775
paulson@3338
   776
* recdef: a new declaration form, allows general recursive functions to be
paulson@3338
   777
defined in theory files.  See HOL/ex/Fib, HOL/ex/Primes, HOL/Subst/Unify.
paulson@3338
   778
paulson@3002
   779
* the constant for negation has been renamed from "not" to "Not" to
wenzelm@3107
   780
harmonize with FOL, ZF, LK, etc.;
paulson@3002
   781
wenzelm@3107
   782
* HOL/ex/LFilter theory of a corecursive "filter" functional for
wenzelm@3107
   783
infinite lists;
paulson@3002
   784
wenzelm@3227
   785
* HOL/Modelcheck demonstrates invocation of model checker oracle;
wenzelm@3227
   786
paulson@3002
   787
* HOL/ex/Ring.thy declares cring_simp, which solves equational
paulson@3002
   788
problems in commutative rings, using axiomatic type classes for + and *;
paulson@3002
   789
paulson@3002
   790
* more examples in HOL/MiniML and HOL/Auth;
paulson@3002
   791
paulson@3002
   792
* more default rewrite rules for quantifiers, union/intersection;
paulson@3002
   793
nipkow@3321
   794
* a new constant `arbitrary == @x.False';
nipkow@3321
   795
wenzelm@3107
   796
* HOLCF/IOA replaces old HOL/IOA;
wenzelm@3107
   797
wenzelm@5726
   798
* HOLCF changes: derived all rules and arities
wenzelm@5726
   799
  + axiomatic type classes instead of classes
slotosch@2653
   800
  + typedef instead of faking type definitions
paulson@2747
   801
  + eliminated the internal constants less_fun, less_cfun, UU_fun, UU_cfun etc.
wenzelm@2730
   802
  + new axclasses cpo, chfin, flat with flat < chfin < pcpo < cpo < po
slotosch@2653
   803
  + eliminated the types void, one, tr
slotosch@2653
   804
  + use unit lift and bool lift (with translations) instead of one and tr
slotosch@2653
   805
  + eliminated blift from Lift3.thy (use Def instead of blift)
wenzelm@3107
   806
  all eliminated rules are derived as theorems --> no visible changes ;
oheimb@2649
   807
wenzelm@3006
   808
paulson@3002
   809
*** ZF ***
wenzelm@2553
   810
paulson@2865
   811
* ZF now has Fast_tac, Simp_tac and Auto_tac.  Union_iff is a now a default
paulson@2865
   812
rewrite rule; this may affect some proofs.  eq_cs is gone but can be put back
paulson@2865
   813
as ZF_cs addSIs [equalityI];
wenzelm@2553
   814
wenzelm@2554
   815
wenzelm@2732
   816
wenzelm@2553
   817
New in Isabelle94-7 (November 96)
wenzelm@2553
   818
---------------------------------
wenzelm@2553
   819
wenzelm@2553
   820
* allowing negative levels (as offsets) in prlev and choplev;
wenzelm@2553
   821
wenzelm@2554
   822
* super-linear speedup for large simplifications;
wenzelm@2554
   823
wenzelm@2554
   824
* FOL, ZF and HOL now use miniscoping: rewriting pushes
wenzelm@2554
   825
quantifications in as far as possible (COULD MAKE EXISTING PROOFS
wenzelm@2554
   826
FAIL); can suppress it using the command Delsimps (ex_simps @
wenzelm@2554
   827
all_simps); De Morgan laws are also now included, by default;
wenzelm@2554
   828
wenzelm@2554
   829
* improved printing of ==>  :  ~:
wenzelm@2554
   830
wenzelm@2554
   831
* new object-logic "Sequents" adds linear logic, while replacing LK
wenzelm@2554
   832
and Modal (thanks to Sara Kalvala);
wenzelm@2554
   833
wenzelm@2554
   834
* HOL/Auth: correctness proofs for authentication protocols;
wenzelm@2554
   835
wenzelm@2554
   836
* HOL: new auto_tac combines rewriting and classical reasoning (many
wenzelm@2554
   837
examples on HOL/Auth);
wenzelm@2554
   838
wenzelm@2554
   839
* HOL: new command AddIffs for declaring theorems of the form P=Q to
wenzelm@2554
   840
the rewriter and classical reasoner simultaneously;
wenzelm@2554
   841
wenzelm@2554
   842
* function uresult no longer returns theorems in "standard" format;
wenzelm@2554
   843
regain previous version by: val uresult = standard o uresult;
wenzelm@2554
   844
wenzelm@2554
   845
wenzelm@2554
   846
wenzelm@2554
   847
New in Isabelle94-6
wenzelm@2554
   848
-------------------
wenzelm@2554
   849
wenzelm@2554
   850
* oracles -- these establish an interface between Isabelle and trusted
wenzelm@2554
   851
external reasoners, which may deliver results as theorems;
wenzelm@2554
   852
wenzelm@2554
   853
* proof objects (in particular record all uses of oracles);
wenzelm@2554
   854
wenzelm@2554
   855
* Simp_tac, Fast_tac, etc. that refer to implicit simpset / claset;
wenzelm@2554
   856
wenzelm@2554
   857
* "constdefs" section in theory files;
wenzelm@2554
   858
wenzelm@2554
   859
* "primrec" section (HOL) no longer requires names;
wenzelm@2554
   860
wenzelm@2554
   861
* internal type "tactic" now simply "thm -> thm Sequence.seq";
wenzelm@2554
   862
wenzelm@2554
   863
wenzelm@2554
   864
wenzelm@2554
   865
New in Isabelle94-5
wenzelm@2554
   866
-------------------
wenzelm@2554
   867
wenzelm@2554
   868
* reduced space requirements;
wenzelm@2554
   869
wenzelm@2554
   870
* automatic HTML generation from theories;
wenzelm@2554
   871
wenzelm@2554
   872
* theory files no longer require "..." (quotes) around most types;
wenzelm@2554
   873
wenzelm@2554
   874
* new examples, including two proofs of the Church-Rosser theorem;
wenzelm@2554
   875
wenzelm@2554
   876
* non-curried (1994) version of HOL is no longer distributed;
wenzelm@2554
   877
wenzelm@2553
   878
paulson@2557
   879
paulson@2557
   880
New in Isabelle94-4
paulson@2557
   881
-------------------
paulson@2557
   882
paulson@2747
   883
* greatly reduced space requirements;
paulson@2557
   884
paulson@2557
   885
* theory files (.thy) no longer require \...\ escapes at line breaks;
paulson@2557
   886
wenzelm@5726
   887
* searchable theorem database (see the section "Retrieving theorems" on
paulson@2557
   888
page 8 of the Reference Manual);
paulson@2557
   889
paulson@2557
   890
* new examples, including Grabczewski's monumental case study of the
paulson@2557
   891
Axiom of Choice;
paulson@2557
   892
paulson@2557
   893
* The previous version of HOL renamed to Old_HOL;
paulson@2557
   894
wenzelm@5726
   895
* The new version of HOL (previously called CHOL) uses a curried syntax
paulson@2557
   896
for functions.  Application looks like f a b instead of f(a,b);
paulson@2557
   897
paulson@2557
   898
* Mutually recursive inductive definitions finally work in HOL;
paulson@2557
   899
paulson@2557
   900
* In ZF, pattern-matching on tuples is now available in all abstractions and
paulson@2557
   901
translates to the operator "split";
paulson@2557
   902
paulson@2557
   903
paulson@2557
   904
paulson@2557
   905
New in Isabelle94-3
paulson@2557
   906
-------------------
paulson@2557
   907
wenzelm@5726
   908
* new infix operator, addss, allowing the classical reasoner to
paulson@2557
   909
perform simplification at each step of its search.  Example:
wenzelm@5726
   910
        fast_tac (cs addss ss)
paulson@2557
   911
wenzelm@5726
   912
* a new logic, CHOL, the same as HOL, but with a curried syntax
wenzelm@5726
   913
for functions.  Application looks like f a b instead of f(a,b).  Also pairs
paulson@2557
   914
look like (a,b) instead of <a,b>;
paulson@2557
   915
paulson@2557
   916
* PLEASE NOTE: CHOL will eventually replace HOL!
paulson@2557
   917
paulson@2557
   918
* In CHOL, pattern-matching on tuples is now available in all abstractions.
paulson@2557
   919
It translates to the operator "split".  A new theory of integers is available;
paulson@2557
   920
paulson@2557
   921
* In ZF, integer numerals now denote two's-complement binary integers.
paulson@2557
   922
Arithmetic operations can be performed by rewriting.  See ZF/ex/Bin.ML;
paulson@2557
   923
wenzelm@5726
   924
* Many new examples: I/O automata, Church-Rosser theorem, equivalents
paulson@2557
   925
of the Axiom of Choice;
paulson@2557
   926
paulson@2557
   927
paulson@2557
   928
paulson@2557
   929
New in Isabelle94-2
paulson@2557
   930
-------------------
paulson@2557
   931
wenzelm@5726
   932
* Significantly faster resolution;
paulson@2557
   933
paulson@2557
   934
* the different sections in a .thy file can now be mixed and repeated
paulson@2557
   935
freely;
paulson@2557
   936
paulson@2557
   937
* Database of theorems for FOL, HOL and ZF.  New
paulson@2557
   938
commands including qed, qed_goal and bind_thm store theorems in the database.
paulson@2557
   939
paulson@2557
   940
* Simple database queries: return a named theorem (get_thm) or all theorems of
paulson@2557
   941
a given theory (thms_of), or find out what theory a theorem was proved in
paulson@2557
   942
(theory_of_thm);
paulson@2557
   943
paulson@2557
   944
* Bugs fixed in the inductive definition and datatype packages;
paulson@2557
   945
paulson@2557
   946
* The classical reasoner provides deepen_tac and depth_tac, making FOL_dup_cs
paulson@2557
   947
and HOL_dup_cs obsolete;
paulson@2557
   948
paulson@2557
   949
* Syntactic ambiguities caused by the new treatment of syntax in Isabelle94-1
paulson@2557
   950
have been removed;
paulson@2557
   951
paulson@2557
   952
* Simpler definition of function space in ZF;
paulson@2557
   953
paulson@2557
   954
* new results about cardinal and ordinal arithmetic in ZF;
paulson@2557
   955
paulson@2557
   956
* 'subtype' facility in HOL for introducing new types as subsets of existing
paulson@2557
   957
types;
paulson@2557
   958
paulson@2557
   959
wenzelm@2553
   960
$Id$