NEWS
author paulson
Thu Jun 29 12:14:04 2000 +0200 (2000-06-29)
changeset 9185 30d46270a427
parent 9085 5ce73f3cadff
child 9198 0ab3c81e9425
permissions -rw-r--r--
weak elimination rules
wenzelm@8729
     1
wenzelm@5363
     2
Isabelle NEWS -- history user-relevant changes
wenzelm@5363
     3
==============================================
wenzelm@2553
     4
wenzelm@8015
     5
New in this Isabelle version
wenzelm@8015
     6
----------------------------
wenzelm@8015
     7
paulson@8014
     8
*** Overview of INCOMPATIBILITIES (see below for more details) ***
paulson@8014
     9
wenzelm@8848
    10
* HOL: simplification of natural numbers is much changed; to partly
wenzelm@8848
    11
recover the old behaviour (e.g. to prevent n+n rewriting to #2*n)
wenzelm@8848
    12
issue the following ML commands:
wenzelm@8848
    13
wenzelm@8848
    14
  Delsimprocs Nat_Numeral_Simprocs.cancel_numerals;
wenzelm@8848
    15
  Delsimprocs [Nat_Numeral_Simprocs.combine_numerals];
paulson@8788
    16
paulson@8967
    17
* HOL: 0 is now overloaded, so the type constraint ::nat may sometimes be
paulson@8967
    18
needed;
paulson@8967
    19
wenzelm@8729
    20
* HOL: the constant for f``x is now "image" rather than "op ``";
paulson@8014
    21
wenzelm@8729
    22
* HOL: the cartesian product is now "<*>" instead of "Times"; the
wenzelm@8729
    23
lexicographic product is now "<*lex*>" instead of "**";
nipkow@8705
    24
wenzelm@8518
    25
* HOL: exhaust_tac on datatypes superceded by new generic case_tac;
wenzelm@8440
    26
nipkow@8603
    27
* HOL: simplification no longer dives into case-expressions
nipkow@8603
    28
wenzelm@8655
    29
* HOL: the recursion equations generated by 'recdef' are now called
wenzelm@8655
    30
f.simps instead of f.rules;
nipkow@8626
    31
wenzelm@8848
    32
* HOL: theory Sexp now in HOL/Induct examples (used to be part of main
wenzelm@8848
    33
HOL, but was unused); should better use HOL's datatype package anyway;
wenzelm@8848
    34
wenzelm@8848
    35
* HOL/Real: "rabs" replaced by overloaded "abs" function;
wenzelm@8848
    36
wenzelm@8887
    37
* HOL/ML: even fewer consts are declared as global (see theories Ord,
wenzelm@8887
    38
Lfp, Gfp, WF); this only affects ML packages that refer to const names
wenzelm@8887
    39
internally;
wenzelm@8887
    40
wenzelm@8921
    41
* Isar: changed syntax of local blocks from {{ }} to { };
wenzelm@8921
    42
paulson@9185
    43
* Provers: Blast_tac now warns of and ignores "weak elimination rules" e.g.
paulson@9185
    44
  [| inj ?f;          ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
paulson@9185
    45
use instead the strong form,
paulson@9185
    46
  [| inj ?f; ~ ?W ==> ?f ?x = ?f ?y; ?x = ?y ==> ?W |] ==> ?W
paulson@9185
    47
In HOL, FOR and ZF the function cla_make_elim will create such rules
paulson@9185
    48
from destruct-rules;
paulson@9185
    49
wenzelm@8994
    50
* ML: renamed flags Syntax.trace_norm_ast to Syntax.trace_ast; global
wenzelm@8994
    51
timing flag supersedes proof_timing and Toplevel.trace;
wenzelm@8994
    52
wenzelm@8518
    53
* ML: PureThy.add_thms/add_axioms/add_defs return theorems as well;
wenzelm@8440
    54
wenzelm@8729
    55
* LaTeX: several improvements of isabelle.sty;
wenzelm@8729
    56
paulson@8014
    57
wenzelm@8487
    58
*** Document preparation ***
wenzelm@8358
    59
wenzelm@8358
    60
* isatool mkdir provides easy setup of Isabelle session directories,
wenzelm@8518
    61
including proper document sources;
wenzelm@8358
    62
wenzelm@8358
    63
* generated LaTeX sources are now deleted after successful run
wenzelm@8358
    64
(isatool document -c); may retain a copy somewhere else via -D option
wenzelm@8358
    65
of isatool usedir;
wenzelm@8358
    66
wenzelm@8566
    67
* isatool usedir -D now lets isatool latex -o sty update the Isabelle
wenzelm@8566
    68
style files, achieving self-contained LaTeX sources;
wenzelm@8566
    69
wenzelm@8518
    70
* old-style theories now produce (crude) LaTeX output as well;
wenzelm@8358
    71
wenzelm@9057
    72
* browser info session directories are now self-contained (may be put
wenzelm@9057
    73
on WWW server seperately);
wenzelm@9057
    74
wenzelm@8358
    75
wenzelm@8184
    76
*** Isar ***
wenzelm@8184
    77
wenzelm@8621
    78
* Pure: local results and corresponding term bindings are now subject
wenzelm@8621
    79
to Hindley-Milner polymorphism (similar to ML); this accommodates
wenzelm@8621
    80
incremental type-inference nicely;
wenzelm@8283
    81
wenzelm@8621
    82
* Pure: new 'obtain' language element supports generalized existence
wenzelm@8621
    83
reasoning;
wenzelm@8621
    84
wenzelm@8621
    85
* Pure: new calculational elements 'moreover' and 'ultimately' support
wenzelm@8621
    86
plain accumulation of results, without applying any rules yet;
wenzelm@8184
    87
wenzelm@8487
    88
* Pure: scalable support for case-analysis type proofs: new 'case'
wenzelm@8440
    89
language element refers to local contexts symbolically, as produced by
wenzelm@8440
    90
certain proof methods; internally, case names are attached to theorems
wenzelm@8440
    91
as "tags";
wenzelm@8440
    92
wenzelm@8921
    93
* Pure: changed syntax of local blocks from {{ }} to { };
wenzelm@8921
    94
wenzelm@8921
    95
* Pure: syntax of sorts made inner, i.e. have to write "{a, b, c}"
wenzelm@8921
    96
instead of {a, b, c};
wenzelm@8921
    97
wenzelm@8621
    98
* Pure now provides its own version of intro/elim/dest attributes;
wenzelm@8621
    99
useful for building new logics, but beware of confusion with the
wenzelm@8621
   100
Provers/classical ones;
wenzelm@8621
   101
wenzelm@8991
   102
* Pure: the local context of (non-atomic) goals is provided via case
wenzelm@8991
   103
name 'antecedent';
wenzelm@8991
   104
wenzelm@9011
   105
* Pure: removed obsolete 'transfer' attribute (transfer of thms to the
wenzelm@9011
   106
current context is now done automatically);
wenzelm@9011
   107
wenzelm@8487
   108
* Provers: splitter support (via 'split' attribute and 'simp' method
wenzelm@8487
   109
modifier); 'simp' method: 'only:' modifier removes loopers as well
wenzelm@8487
   110
(including splits);
wenzelm@8487
   111
wenzelm@8440
   112
* HOL: new proof method 'cases' and improved version of 'induct' now
wenzelm@8440
   113
support named cases; major packages (inductive, datatype, primrec,
wenzelm@8440
   114
recdef) support case names and properly name parameters;
wenzelm@8440
   115
wenzelm@8440
   116
* HOL: removed 'case_split' thm binding, should use 'cases' proof
wenzelm@8283
   117
method anyway;
wenzelm@8283
   118
wenzelm@8440
   119
* names of theorems etc. may be natural numbers as well;
wenzelm@8283
   120
wenzelm@8518
   121
* Provers: intro/elim/dest attributes: changed ! / !! flags to ? / ??;
wenzelm@8283
   122
wenzelm@8887
   123
* 'pr' command: optional goals_limit argument; no longer prints theory
wenzelm@8887
   124
contexts, but only proof states;
wenzelm@8487
   125
wenzelm@8487
   126
* diagnostic commands 'pr', 'thm', 'prop', 'term', 'typ' admit
wenzelm@8518
   127
additional print modes to be specified; e.g. "pr(latex)" will print
wenzelm@8518
   128
proof state according to the Isabelle LaTeX style;
wenzelm@8487
   129
wenzelm@8534
   130
* improved support for emulating tactic scripts, including proof
wenzelm@8534
   131
methods 'tactic', 'res_inst_tac' etc., 'subgoal_tac', and 'case_tac' /
wenzelm@8534
   132
'induct_tac' (for HOL datatypes);
wenzelm@8534
   133
wenzelm@8673
   134
* simplified (more robust) goal selection of proof methods: 1st goal,
wenzelm@8673
   135
all goals, or explicit goal specifier (tactic emulation); thus 'proof
wenzelm@8673
   136
method scripts' have to be in depth-first order;
wenzelm@8673
   137
wenzelm@8673
   138
* tuned 'let' syntax: replace 'as' keyword by 'and';
wenzelm@8534
   139
wenzelm@8729
   140
* theory command 'hide' removes declarations from class/type/const
wenzelm@8729
   141
name spaces;
wenzelm@8729
   142
wenzelm@8184
   143
paulson@8014
   144
*** HOL ***
paulson@8014
   145
oheimb@9028
   146
* HOL/Prolog: a (bare-bones) implementation of Lambda-Prolog
oheimb@9028
   147
wenzelm@8518
   148
* HOL/Algebra: new theory of rings and univariate polynomials, by
wenzelm@8518
   149
Clemens Ballarin;
paulson@8014
   150
wenzelm@8271
   151
* HOL/record: fixed select-update simplification procedure to handle
wenzelm@8283
   152
extended records as well; admit "r" as field name;
wenzelm@8271
   153
paulson@8392
   154
* HOL/ex: new theory Factorization proving the Fundamental Theorem of
paulson@8392
   155
Arithmetic, by Thomas M Rasmussen;
wenzelm@8007
   156
wenzelm@8570
   157
* HOL/ex/Multiquote: multiple nested quotations and anti-quotations --
wenzelm@8570
   158
basically a generalized version of de-Bruijn representation; very
wenzelm@8570
   159
useful in avoiding lifting all operations;
wenzelm@8570
   160
wenzelm@8848
   161
* HOL/Real: "rabs" replaced by overloaded "abs" function;
wenzelm@8848
   162
paulson@8967
   163
* HOL: 0 is now overloaded over the new sort "zero", allowing its use with
paulson@8967
   164
other numeric types and also as the identity of groups, rings, etc.;
paulson@8967
   165
paulson@8967
   166
* HOL: new axclass plus_ac0 for addition with the AC-laws and 0 as identity.
paulson@8967
   167
Types nat and int belong to this axclass;
paulson@8967
   168
paulson@9085
   169
* greatly improved simplification involving numerals of type nat, int, real:
paulson@8788
   170
   (i + #8 + j) = Suc k simplifies to  #7 + (i + j) = k
paulson@8832
   171
   i*j + k + j*#3*i     simplifies to  #4*(i*j) + k
paulson@8832
   172
  two terms #m*u and #n*u are replaced by #(m+n)*u
paulson@8832
   173
    (where #m, #n and u can implicitly be 1; this is simproc combine_numerals)
paulson@8832
   174
  and the term/formula #m*u+x ~~ #n*u+y simplifies simplifies to #(m-n)+x ~~ y
paulson@8832
   175
    or x ~~ #(n-m)+y, where ~~ is one of = < <= or - (simproc cancel_numerals);
paulson@8736
   176
wenzelm@8848
   177
* HOL: new version of "case_tac" subsumes both boolean case split and
wenzelm@8440
   178
"exhaust_tac" on datatypes; INCOMPATIBILITY: exhaust_tac no longer
wenzelm@8518
   179
exists, may define val exhaust_tac = case_tac for ad-hoc portability;
wenzelm@8440
   180
wenzelm@8848
   181
* HOL: simplification no longer dives into case-expressions: only the
wenzelm@8848
   182
selector expression is simplified, but not the remaining arms. To
wenzelm@8848
   183
enable full simplification of case-expressions for datatype t, you
wenzelm@8848
   184
need to remove t.weak_case_cong from the simpset, either permanently
nipkow@8603
   185
(Delcongs[thm"t.weak_case_cong"];) or locally (delcongs [...]).
nipkow@8603
   186
wenzelm@8848
   187
* HOL/recdef: the recursion equations generated by 'recdef' for
wenzelm@8848
   188
function 'f' are now called f.simps instead of f.rules; if all
wenzelm@8848
   189
termination conditions are proved automatically, these simplification
wenzelm@8848
   190
rules are added to the simpset, as in primrec; rules may be named
wenzelm@8848
   191
individually as well, resulting in a separate list of theorems for
wenzelm@8848
   192
each equation;
wenzelm@8848
   193
nipkow@8925
   194
* HOL: new (overloaded) notation for the set of elements below/above some
nipkow@8925
   195
element: {..u}, {..u(}, {l..}, {)l..}. See theory SetInterval.
nipkow@8925
   196
wenzelm@8848
   197
* HOL: theorems impI, allI, ballI bound as "strip";
wenzelm@8848
   198
wenzelm@8848
   199
* theory Sexp now in HOL/Induct examples (used to be part of main HOL,
wenzelm@8848
   200
but was unused);
nipkow@8626
   201
wenzelm@8887
   202
* fewer consts declared as global (e.g. have to refer to "Lfp.lfp"
wenzelm@8887
   203
instead of "lfp" internally; affects ML packages only);
wenzelm@8887
   204
nipkow@8412
   205
wenzelm@8358
   206
*** General ***
wenzelm@8358
   207
wenzelm@8729
   208
* improved name spaces: ambiguous output is qualified; support for
wenzelm@8729
   209
hiding of names;
wenzelm@8729
   210
wenzelm@8358
   211
* compression of ML heaps images may now be controlled via -c option
wenzelm@8518
   212
of isabelle and isatool usedir (currently only observed by Poly/ML);
wenzelm@8358
   213
wenzelm@9052
   214
* provide TAGS file for Isabelle sources;
wenzelm@9052
   215
wenzelm@8994
   216
* ML: renamed flags Syntax.trace_norm_ast to Syntax.trace_ast; global
wenzelm@8994
   217
timing flag supersedes proof_timing and Toplevel.trace;
wenzelm@8994
   218
wenzelm@8518
   219
* ML: new combinators |>> and |>>> for incremental transformations
wenzelm@8518
   220
with secondary results (e.g. certain theory extensions):
wenzelm@8440
   221
wenzelm@8358
   222
wenzelm@8015
   223
wenzelm@7986
   224
New in Isabelle99 (October 1999)
wenzelm@7986
   225
--------------------------------
oheimb@4649
   226
paulson@5931
   227
*** Overview of INCOMPATIBILITIES (see below for more details) ***
paulson@5931
   228
paulson@6922
   229
* HOL: The THEN and ELSE parts of conditional expressions (if P then x else y)
paulson@6922
   230
are no longer simplified.  (This allows the simplifier to unfold recursive
paulson@6922
   231
functional programs.)  To restore the old behaviour, declare
wenzelm@7215
   232
wenzelm@7215
   233
    Delcongs [if_weak_cong];
paulson@6922
   234
wenzelm@6269
   235
* HOL: Removed the obsolete syntax "Compl A"; use -A for set
wenzelm@6269
   236
complement;
paulson@5931
   237
wenzelm@6269
   238
* HOL: the predicate "inj" is now defined by translation to "inj_on";
paulson@6174
   239
berghofe@7847
   240
* HOL/datatype: mutual_induct_tac no longer exists --
berghofe@7847
   241
  use induct_tac "x_1 ... x_n" instead of mutual_induct_tac ["x_1", ..., "x_n"]
berghofe@7847
   242
wenzelm@6386
   243
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
   244
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
   245
wenzelm@6269
   246
* ZF: The con_defs part of an inductive definition may no longer refer
wenzelm@6269
   247
to constants declared in the same theory;
nipkow@6057
   248
wenzelm@6269
   249
* HOL, ZF: the function mk_cases, generated by the inductive
wenzelm@6269
   250
definition package, has lost an argument.  To simplify its result, it
wenzelm@6269
   251
uses the default simpset instead of a supplied list of theorems.
paulson@6141
   252
wenzelm@7215
   253
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
   254
nipkow@7619
   255
* Simplifier: the type of the infix ML functions
wenzelm@8729
   256
        setSSolver addSSolver setSolver addSolver
nipkow@7619
   257
is now  simpset * solver -> simpset  where `solver' is a new abstract type
nipkow@7619
   258
for packaging solvers. A solver is created via
wenzelm@8729
   259
        mk_solver: string -> (thm list -> int -> tactic) -> solver
nipkow@7619
   260
where the string argument is only a comment.
nipkow@6057
   261
wenzelm@7647
   262
paulson@6069
   263
*** Proof tools ***
paulson@6069
   264
wenzelm@6343
   265
* Provers/Arith/fast_lin_arith.ML contains a functor for creating a
wenzelm@6343
   266
decision procedure for linear arithmetic. Currently it is used for
wenzelm@7593
   267
types `nat', `int', and `real' in HOL (see below); it can, should and
wenzelm@7593
   268
will be instantiated for other types and logics as well.
paulson@6069
   269
nipkow@7324
   270
* The simplifier now accepts rewrite rules with flexible heads, eg
nipkow@7324
   271
     hom ?f ==> ?f(?x+?y) = ?f ?x + ?f ?y
nipkow@7324
   272
  They are applied like any rule with a non-pattern lhs, i.e. by first-order
nipkow@7324
   273
  matching.
paulson@6069
   274
wenzelm@7593
   275
paulson@6014
   276
*** General ***
paulson@6014
   277
wenzelm@7986
   278
* New Isabelle/Isar subsystem provides an alternative to traditional
wenzelm@7215
   279
tactical theorem proving; together with the ProofGeneral/isar user
wenzelm@7215
   280
interface it offers an interactive environment for developing human
wenzelm@7215
   281
readable proof documents (Isar == Intelligible semi-automated
wenzelm@7886
   282
reasoning); for further information see isatool doc isar-ref,
wenzelm@7986
   283
src/HOL/Isar_examples and http://isabelle.in.tum.de/Isar/
wenzelm@7886
   284
wenzelm@7886
   285
* improved presentation of theories: better HTML markup (including
wenzelm@7886
   286
colors), graph views in several sizes; isatool usedir now provides a
wenzelm@7886
   287
proper interface for user theories (via -P option); actual document
wenzelm@7886
   288
preparation based on (PDF)LaTeX is available as well (for new-style
wenzelm@7886
   289
theories only); see isatool doc system for more information;
wenzelm@7215
   290
wenzelm@7252
   291
* native support for Proof General, both for classic Isabelle and
wenzelm@7986
   292
Isabelle/Isar;
wenzelm@7215
   293
wenzelm@7791
   294
* ML function thm_deps visualizes dependencies of theorems and lemmas,
wenzelm@7791
   295
using the graph browser tool;
wenzelm@7791
   296
wenzelm@6751
   297
* Isabelle manuals now also available as PDF;
wenzelm@6751
   298
wenzelm@6449
   299
* theory loader rewritten from scratch (may not be fully
wenzelm@6449
   300
bug-compatible); old loadpath variable has been replaced by show_path,
wenzelm@6671
   301
add_path, del_path, reset_path functions; new operations such as
wenzelm@7593
   302
update_thy, touch_thy, remove_thy, use/update_thy_only (see also
wenzelm@7593
   303
isatool doc ref);
wenzelm@6449
   304
wenzelm@7215
   305
* improved isatool install: option -k creates KDE application icon,
wenzelm@7215
   306
option -p DIR installs standalone binaries;
wenzelm@7215
   307
wenzelm@7215
   308
* added ML_PLATFORM setting (useful for cross-platform installations);
wenzelm@7215
   309
more robust handling of platform specific ML images for SML/NJ;
wenzelm@7215
   310
wenzelm@7886
   311
* the settings environment is now statically scoped, i.e. it is never
wenzelm@7986
   312
created again in sub-processes invoked from isabelle, isatool, or
wenzelm@7886
   313
Isabelle;
wenzelm@7886
   314
wenzelm@7215
   315
* path element specification '~~' refers to '$ISABELLE_HOME';
wenzelm@7215
   316
wenzelm@6343
   317
* in locales, the "assumes" and "defines" parts may be omitted if
wenzelm@6343
   318
empty;
wenzelm@5973
   319
wenzelm@6269
   320
* new print_mode "xsymbols" for extended symbol support (e.g. genuine
wenzelm@6269
   321
long arrows);
wenzelm@6259
   322
wenzelm@6343
   323
* new print_mode "HTML";
wenzelm@6343
   324
wenzelm@6343
   325
* new flag show_tags controls display of tags of theorems (which are
wenzelm@6343
   326
basically just comments that may be attached by some tools);
wenzelm@6343
   327
wenzelm@6461
   328
* Isamode 2.6 requires patch to accomodate change of Isabelle font
wenzelm@6461
   329
mode and goal output format:
wenzelm@6461
   330
wenzelm@6461
   331
diff -r Isamode-2.6/elisp/isa-load.el Isamode/elisp/isa-load.el
wenzelm@6461
   332
244c244
wenzelm@6461
   333
<       (list (isa-getenv "ISABELLE") "-msymbols" logic-name)
wenzelm@6461
   334
---
wenzelm@6533
   335
>       (list (isa-getenv "ISABELLE") "-misabelle_font" "-msymbols" logic-name)
wenzelm@6461
   336
diff -r Isabelle-2.6/elisp/isa-proofstate.el Isamode/elisp/isa-proofstate.el
wenzelm@6461
   337
181c181
wenzelm@6461
   338
< (defconst proofstate-proofstart-regexp "^Level [0-9]+$"
wenzelm@6461
   339
---
wenzelm@6461
   340
> (defconst proofstate-proofstart-regexp "^Level [0-9]+"
wenzelm@6461
   341
wenzelm@7450
   342
* function bind_thms stores lists of theorems (cf. bind_thm);
wenzelm@7450
   343
wenzelm@7593
   344
* new shorthand tactics ftac, eatac, datac, fatac;
wenzelm@7593
   345
wenzelm@7593
   346
* qed (and friends) now accept "" as result name; in that case the
wenzelm@7986
   347
theorem is not stored, but proper checks and presentation of the
wenzelm@7986
   348
result still apply;
wenzelm@7593
   349
wenzelm@7805
   350
* theorem database now also indexes constants "Trueprop", "all",
wenzelm@7805
   351
"==>", "=="; thus thms_containing, findI etc. may retrieve more rules;
wenzelm@7805
   352
oheimb@6028
   353
nipkow@6057
   354
*** HOL ***
nipkow@6057
   355
wenzelm@7215
   356
** HOL arithmetic **
wenzelm@7215
   357
wenzelm@6343
   358
* There are now decision procedures for linear arithmetic over nat and
wenzelm@6343
   359
int:
nipkow@6131
   360
wenzelm@6343
   361
1. arith_tac copes with arbitrary formulae involving `=', `<', `<=',
wenzelm@6343
   362
`+', `-', `Suc', `min', `max' and numerical constants; other subterms
wenzelm@6343
   363
are treated as atomic; subformulae not involving type `nat' or `int'
wenzelm@6343
   364
are ignored; quantified subformulae are ignored unless they are
wenzelm@6343
   365
positive universal or negative existential. The tactic has to be
wenzelm@6343
   366
invoked by hand and can be a little bit slow. In particular, the
wenzelm@6343
   367
running time is exponential in the number of occurrences of `min' and
wenzelm@6343
   368
`max', and `-' on `nat'.
nipkow@6131
   369
wenzelm@6343
   370
2. fast_arith_tac is a cut-down version of arith_tac: it only takes
wenzelm@6343
   371
(negated) (in)equalities among the premises and the conclusion into
wenzelm@6343
   372
account (i.e. no compound formulae) and does not know about `min' and
wenzelm@6343
   373
`max', and `-' on `nat'. It is fast and is used automatically by the
wenzelm@6343
   374
simplifier.
nipkow@6131
   375
wenzelm@6343
   376
NB: At the moment, these decision procedures do not cope with mixed
wenzelm@6343
   377
nat/int formulae where the two parts interact, such as `m < n ==>
wenzelm@6343
   378
int(m) < int(n)'.
oheimb@6028
   379
wenzelm@7215
   380
* HOL/Numeral provides a generic theory of numerals (encoded
wenzelm@7313
   381
efficiently as bit strings); setup for types nat/int/real is in place;
wenzelm@7215
   382
INCOMPATIBILITY: since numeral syntax is now polymorphic, rather than
wenzelm@7215
   383
int, existing theories and proof scripts may require a few additional
wenzelm@7215
   384
type constraints;
wenzelm@7215
   385
wenzelm@7215
   386
* integer division and remainder can now be performed on constant
wenzelm@7215
   387
arguments;
paulson@7157
   388
wenzelm@7215
   389
* many properties of integer multiplication, division and remainder
wenzelm@7215
   390
are now available;
paulson@6922
   391
paulson@7287
   392
* An interface to the Stanford Validity Checker (SVC) is available through the
paulson@7287
   393
tactic svc_tac.  Propositional tautologies and theorems of linear arithmetic
paulson@7287
   394
are proved automatically.  SVC must be installed separately, and its results
paulson@7287
   395
must be TAKEN ON TRUST (Isabelle does not check the proofs, but tags any
paulson@7287
   396
invocation of the underlying oracle).  For SVC see
paulson@7444
   397
  http://verify.stanford.edu/SVC
paulson@6922
   398
wenzelm@7125
   399
* IsaMakefile: the HOL-Real target now builds an actual image;
wenzelm@7125
   400
wenzelm@7215
   401
wenzelm@7215
   402
** HOL misc **
wenzelm@7215
   403
wenzelm@7595
   404
* HOL/Real/HahnBanach: the Hahn-Banach theorem for real vector spaces
wenzelm@7595
   405
(in Isabelle/Isar) -- by Gertrud Bauer;
wenzelm@7595
   406
wenzelm@7691
   407
* HOL/BCV: generic model of bytecode verification, i.e. data-flow
wenzelm@7691
   408
analysis for assembly languages with subtypes;
wenzelm@7691
   409
wenzelm@6278
   410
* HOL/TLA (Lamport's Temporal Logic of Actions): major reorganization
wenzelm@6278
   411
-- avoids syntactic ambiguities and treats state, transition, and
wenzelm@6278
   412
temporal levels more uniformly; introduces INCOMPATIBILITIES due to
wenzelm@6278
   413
changed syntax and (many) tactics;
wenzelm@6278
   414
wenzelm@7791
   415
* HOL/inductive: Now also handles more general introduction rules such
wenzelm@7791
   416
  as "ALL y. (y, x) : r --> y : acc r ==> x : acc r"; monotonicity
wenzelm@7791
   417
  theorems are now maintained within the theory (maintained via the
wenzelm@7791
   418
  "mono" attribute);
berghofe@7780
   419
wenzelm@7238
   420
* HOL/datatype: Now also handles arbitrarily branching datatypes
wenzelm@7238
   421
  (using function types) such as
wenzelm@7238
   422
wenzelm@7238
   423
  datatype 'a tree = Atom 'a | Branch "nat => 'a tree"
berghofe@7047
   424
wenzelm@7326
   425
* HOL/record: record_simproc (part of the default simpset) takes care
wenzelm@7326
   426
of selectors applied to updated records; record_split_tac is no longer
wenzelm@7327
   427
part of the default claset; update_defs may now be removed from the
wenzelm@7327
   428
simpset in many cases; COMPATIBILITY: old behavior achieved by
wenzelm@7326
   429
wenzelm@7326
   430
  claset_ref () := claset() addSWrapper record_split_wrapper;
wenzelm@7326
   431
  Delsimprocs [record_simproc]
wenzelm@7326
   432
wenzelm@6386
   433
* HOL/typedef: fixed type inference for representing set; type
wenzelm@6386
   434
arguments now have to occur explicitly on the rhs as type constraints;
wenzelm@6386
   435
paulson@7287
   436
* HOL/recdef (TFL): 'congs' syntax now expects comma separated list of theorem
paulson@7287
   437
names rather than an ML expression;
paulson@7287
   438
paulson@7287
   439
* HOL/defer_recdef (TFL): like recdef but the well-founded relation can be
paulson@7287
   440
supplied later.  Program schemes can be defined, such as
paulson@7287
   441
    "While B C s = (if B s then While B C (C s) else s)"
paulson@7287
   442
where the well-founded relation can be chosen after B and C have been given.
wenzelm@6563
   443
wenzelm@7215
   444
* HOL/List: the constructors of type list are now Nil and Cons;
wenzelm@7215
   445
INCOMPATIBILITY: while [] and infix # syntax is still there, of
wenzelm@7215
   446
course, ML tools referring to List.list.op # etc. have to be adapted;
wenzelm@7215
   447
wenzelm@7238
   448
* HOL_quantifiers flag superseded by "HOL" print mode, which is
wenzelm@7238
   449
disabled by default; run isabelle with option -m HOL to get back to
wenzelm@7238
   450
the original Gordon/HOL-style output;
wenzelm@7238
   451
wenzelm@7238
   452
* HOL/Ord.thy: new bounded quantifier syntax (input only): ALL x<y. P,
wenzelm@7238
   453
ALL x<=y. P, EX x<y. P, EX x<=y. P;
wenzelm@7238
   454
wenzelm@7238
   455
* HOL basic syntax simplified (more orthogonal): all variants of
wenzelm@7238
   456
All/Ex now support plain / symbolic / HOL notation; plain syntax for
wenzelm@7238
   457
Eps operator is provided as well: "SOME x. P[x]";
wenzelm@7238
   458
berghofe@7320
   459
* HOL/Sum.thy: sum_case has been moved to HOL/Datatype;
wenzelm@7261
   460
wenzelm@7280
   461
* HOL/Univ.thy: infix syntax <*>, <+>, <**>, <+> eliminated and made
wenzelm@7280
   462
thus available for user theories;
wenzelm@7280
   463
wenzelm@7300
   464
* HOLCF/IOA/Sequents: renamed 'Cons' to 'Consq' to avoid clash with
wenzelm@7300
   465
HOL/List; hardly an INCOMPATIBILITY since '>>' syntax is used all the
wenzelm@7300
   466
time;
wenzelm@7300
   467
wenzelm@7986
   468
* HOL: new tactic smp_tac: int -> int -> tactic, which applies spec
wenzelm@7986
   469
several times and then mp;
oheimb@7492
   470
wenzelm@7215
   471
paulson@7113
   472
*** LK ***
paulson@7113
   473
wenzelm@7215
   474
* the notation <<...>> is now available as a notation for sequences of
wenzelm@7215
   475
formulas;
paulson@7113
   476
paulson@7113
   477
* the simplifier is now installed
paulson@7113
   478
wenzelm@8729
   479
* the axiom system has been generalized (thanks to Soren Heilmann)
paulson@7113
   480
paulson@7113
   481
* the classical reasoner now has a default rule database
paulson@7113
   482
paulson@7113
   483
paulson@6064
   484
*** ZF ***
paulson@6064
   485
paulson@6064
   486
* new primrec section allows primitive recursive functions to be given
wenzelm@6269
   487
directly (as in HOL) over datatypes and the natural numbers;
paulson@6064
   488
wenzelm@6269
   489
* new tactics induct_tac and exhaust_tac for induction (or case
wenzelm@6269
   490
analysis) over datatypes and the natural numbers;
paulson@6064
   491
paulson@6064
   492
* the datatype declaration of type T now defines the recursor T_rec;
paulson@6064
   493
paulson@6141
   494
* simplification automatically does freeness reasoning for datatype
wenzelm@6269
   495
constructors;
paulson@6141
   496
wenzelm@6269
   497
* automatic type-inference, with AddTCs command to insert new
wenzelm@6269
   498
type-checking rules;
paulson@6155
   499
wenzelm@6269
   500
* datatype introduction rules are now added as Safe Introduction rules
wenzelm@6269
   501
to the claset;
paulson@6155
   502
wenzelm@6269
   503
* the syntax "if P then x else y" is now available in addition to
wenzelm@6269
   504
if(P,x,y);
wenzelm@6269
   505
paulson@6069
   506
wenzelm@6343
   507
*** Internal programming interfaces ***
wenzelm@6343
   508
wenzelm@7919
   509
* tuned simplifier trace output; new flag debug_simp;
wenzelm@7919
   510
wenzelm@7420
   511
* structures Vartab / Termtab (instances of TableFun) offer efficient
wenzelm@7420
   512
tables indexed by indexname_ord / term_ord (compatible with aconv);
wenzelm@7420
   513
wenzelm@6386
   514
* AxClass.axclass_tac lost the theory argument;
wenzelm@6386
   515
wenzelm@6343
   516
* tuned current_goals_markers semantics: begin / end goal avoids
wenzelm@6343
   517
printing empty lines;
wenzelm@6343
   518
wenzelm@6343
   519
* removed prs and prs_fn hook, which was broken because it did not
wenzelm@6343
   520
include \n in its semantics, forcing writeln to add one
wenzelm@6343
   521
uncoditionally; replaced prs_fn by writeln_fn; consider std_output:
wenzelm@6343
   522
string -> unit if you really want to output text without newline;
wenzelm@6343
   523
wenzelm@6343
   524
* Symbol.output subject to print mode; INCOMPATIBILITY: defaults to
wenzelm@6343
   525
plain output, interface builders may have to enable 'isabelle_font'
wenzelm@6343
   526
mode to get Isabelle font glyphs as before;
wenzelm@6343
   527
wenzelm@6343
   528
* refined token_translation interface; INCOMPATIBILITY: output length
wenzelm@6343
   529
now of type real instead of int;
wenzelm@6343
   530
wenzelm@7196
   531
* theory loader actions may be traced via new ThyInfo.add_hook
wenzelm@7196
   532
interface (see src/Pure/Thy/thy_info.ML); example application: keep
wenzelm@7196
   533
your own database of information attached to *whole* theories -- as
wenzelm@7196
   534
opposed to intra-theory data slots offered via TheoryDataFun;
wenzelm@7196
   535
wenzelm@7647
   536
* proper handling of dangling sort hypotheses (at last!);
wenzelm@7647
   537
Thm.strip_shyps and Drule.strip_shyps_warning take care of removing
wenzelm@7647
   538
extra sort hypotheses that can be witnessed from the type signature;
wenzelm@7986
   539
the force_strip_shyps flag is gone, any remaining shyps are simply
wenzelm@7986
   540
left in the theorem (with a warning issued by strip_shyps_warning);
wenzelm@7647
   541
wenzelm@6343
   542
paulson@6064
   543
wenzelm@5781
   544
New in Isabelle98-1 (October 1998)
wenzelm@5781
   545
----------------------------------
wenzelm@5781
   546
wenzelm@5127
   547
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4842
   548
wenzelm@5726
   549
* several changes of automated proof tools;
wenzelm@5373
   550
wenzelm@5726
   551
* HOL: major changes to the inductive and datatype packages, including
wenzelm@5726
   552
some minor incompatibilities of theory syntax;
berghofe@5214
   553
wenzelm@5726
   554
* HOL: renamed r^-1 to 'converse' from 'inverse'; 'inj_onto' is now
wenzelm@5217
   555
called `inj_on';
paulson@5160
   556
nipkow@5275
   557
* HOL: removed duplicate thms in Arith:
nipkow@5275
   558
  less_imp_add_less  should be replaced by  trans_less_add1
nipkow@5275
   559
  le_imp_add_le      should be replaced by  trans_le_add1
paulson@5160
   560
wenzelm@5726
   561
* HOL: unary minus is now overloaded (new type constraints may be
wenzelm@5726
   562
required);
paulson@5490
   563
wenzelm@5726
   564
* HOL and ZF: unary minus for integers is now #- instead of #~.  In
wenzelm@5726
   565
ZF, expressions such as n#-1 must be changed to n#- 1, since #-1 is
wenzelm@5726
   566
now taken as an integer constant.
paulson@5541
   567
wenzelm@5726
   568
* Pure: ML function 'theory_of' renamed to 'theory';
wenzelm@5397
   569
wenzelm@5363
   570
wenzelm@5127
   571
*** Proof tools ***
nipkow@4880
   572
nipkow@5657
   573
* Simplifier:
nipkow@5657
   574
  1. Asm_full_simp_tac is now more aggressive.
nipkow@5657
   575
     1. It will sometimes reorient premises if that increases their power to
nipkow@5657
   576
        simplify.
nipkow@5657
   577
     2. It does no longer proceed strictly from left to right but may also
nipkow@5657
   578
        rotate premises to achieve further simplification.
nipkow@5657
   579
     For compatibility reasons there is now Asm_lr_simp_tac which is like the
nipkow@5657
   580
     old Asm_full_simp_tac in that it does not rotate premises.
nipkow@5657
   581
  2. The simplifier now knows a little bit about nat-arithmetic.
nipkow@4880
   582
wenzelm@5127
   583
* Classical reasoner: wrapper mechanism for the classical reasoner now
wenzelm@5127
   584
allows for selected deletion of wrappers, by introduction of names for
wenzelm@5127
   585
wrapper functionals.  This implies that addbefore, addSbefore,
wenzelm@5127
   586
addaltern, and addSaltern now take a pair (name, tactic) as argument,
wenzelm@5127
   587
and that adding two tactics with the same name overwrites the first
wenzelm@5127
   588
one (emitting a warning).
oheimb@4824
   589
  type wrapper = (int -> tactic) -> (int -> tactic)
oheimb@4649
   590
  setWrapper, setSWrapper, compWrapper and compSWrapper are replaced by
oheimb@4824
   591
  addWrapper, addSWrapper: claset * (string * wrapper) -> claset
oheimb@4824
   592
  delWrapper, delSWrapper: claset *  string            -> claset
oheimb@4649
   593
  getWrapper is renamed to appWrappers, getSWrapper to appSWrappers;
oheimb@4649
   594
wenzelm@5705
   595
* Classical reasoner: addbefore/addSbefore now have APPEND/ORELSE
wenzelm@5726
   596
semantics; addbefore now affects only the unsafe part of step_tac
wenzelm@5726
   597
etc.; this affects addss/auto_tac/force_tac, so EXISTING PROOFS MAY
wenzelm@5726
   598
FAIL, but proofs should be fixable easily, e.g. by replacing Auto_tac
wenzelm@5726
   599
by Force_tac;
oheimb@5524
   600
wenzelm@5726
   601
* Classical reasoner: setwrapper to setWrapper and compwrapper to
wenzelm@5726
   602
compWrapper; added safe wrapper (and access functions for it);
oheimb@5524
   603
wenzelm@5127
   604
* HOL/split_all_tac is now much faster and fails if there is nothing
wenzelm@5726
   605
to split.  Some EXISTING PROOFS MAY REQUIRE ADAPTION because the order
wenzelm@5726
   606
and the names of the automatically generated variables have changed.
wenzelm@5726
   607
split_all_tac has moved within claset() from unsafe wrappers to safe
wenzelm@5726
   608
wrappers, which means that !!-bound variables are split much more
wenzelm@5726
   609
aggressively, and safe_tac and clarify_tac now split such variables.
wenzelm@5726
   610
If this splitting is not appropriate, use delSWrapper "split_all_tac".
wenzelm@5726
   611
Note: the same holds for record_split_tac, which does the job of
wenzelm@5726
   612
split_all_tac for record fields.
wenzelm@5127
   613
wenzelm@5726
   614
* HOL/Simplifier: Rewrite rules for case distinctions can now be added
wenzelm@5726
   615
permanently to the default simpset using Addsplits just like
wenzelm@5726
   616
Addsimps. They can be removed via Delsplits just like
wenzelm@5726
   617
Delsimps. Lower-case versions are also available.
wenzelm@5127
   618
wenzelm@5726
   619
* HOL/Simplifier: The rule split_if is now part of the default
wenzelm@5726
   620
simpset. This means that the simplifier will eliminate all occurrences
wenzelm@5726
   621
of if-then-else in the conclusion of a goal. To prevent this, you can
wenzelm@5726
   622
either remove split_if completely from the default simpset by
wenzelm@5726
   623
`Delsplits [split_if]' or remove it in a specific call of the
wenzelm@5726
   624
simplifier using `... delsplits [split_if]'.  You can also add/delete
wenzelm@5726
   625
other case splitting rules to/from the default simpset: every datatype
wenzelm@5726
   626
generates suitable rules `split_t_case' and `split_t_case_asm' (where
wenzelm@5726
   627
t is the name of the datatype).
wenzelm@5127
   628
wenzelm@5726
   629
* Classical reasoner / Simplifier combination: new force_tac (and
wenzelm@5127
   630
derivatives Force_tac, force) combines rewriting and classical
wenzelm@5127
   631
reasoning (and whatever other tools) similarly to auto_tac, but is
wenzelm@5726
   632
aimed to solve the given subgoal completely.
wenzelm@5127
   633
wenzelm@5127
   634
wenzelm@5127
   635
*** General ***
wenzelm@5127
   636
wenzelm@5217
   637
* new top-level commands `Goal' and `Goalw' that improve upon `goal'
wenzelm@5127
   638
and `goalw': the theory is no longer needed as an explicit argument -
wenzelm@5127
   639
the current theory context is used; assumptions are no longer returned
wenzelm@5127
   640
at the ML-level unless one of them starts with ==> or !!; it is
wenzelm@5217
   641
recommended to convert to these new commands using isatool fixgoal
wenzelm@5217
   642
(backup your sources first!);
wenzelm@4842
   643
wenzelm@5217
   644
* new top-level commands 'thm' and 'thms' for retrieving theorems from
wenzelm@5207
   645
the current theory context, and 'theory' to lookup stored theories;
paulson@4806
   646
paulson@5722
   647
* new theory section 'locale' for declaring constants, assumptions and
paulson@5722
   648
definitions that have local scope;
paulson@5722
   649
wenzelm@5127
   650
* new theory section 'nonterminals' for purely syntactic types;
wenzelm@4858
   651
wenzelm@5127
   652
* new theory section 'setup' for generic ML setup functions
wenzelm@5127
   653
(e.g. package initialization);
wenzelm@4869
   654
wenzelm@5131
   655
* the distribution now includes Isabelle icons: see
wenzelm@5131
   656
lib/logo/isabelle-{small,tiny}.xpm;
wenzelm@5131
   657
wenzelm@5363
   658
* isatool install - install binaries with absolute references to
wenzelm@5363
   659
ISABELLE_HOME/bin;
wenzelm@5363
   660
wenzelm@5572
   661
* isatool logo -- create instances of the Isabelle logo (as EPS);
wenzelm@5572
   662
wenzelm@5407
   663
* print mode 'emacs' reserved for Isamode;
wenzelm@5407
   664
wenzelm@5726
   665
* support multiple print (ast) translations per constant name;
wenzelm@5726
   666
wenzelm@6925
   667
* theorems involving oracles are now printed with a suffixed [!];
wenzelm@6925
   668
wenzelm@4711
   669
paulson@4661
   670
*** HOL ***
paulson@4661
   671
wenzelm@5710
   672
* there is now a tutorial on Isabelle/HOL (do 'isatool doc tutorial');
nipkow@5709
   673
wenzelm@5217
   674
* HOL/inductive package reorganized and improved: now supports mutual
paulson@5267
   675
definitions such as
wenzelm@5217
   676
wenzelm@5217
   677
  inductive EVEN ODD
wenzelm@5217
   678
    intrs
wenzelm@5217
   679
      null "0 : EVEN"
wenzelm@5217
   680
      oddI "n : EVEN ==> Suc n : ODD"
wenzelm@5217
   681
      evenI "n : ODD ==> Suc n : EVEN"
wenzelm@5217
   682
wenzelm@5217
   683
new theorem list "elims" contains an elimination rule for each of the
wenzelm@5217
   684
recursive sets; inductive definitions now handle disjunctive premises
wenzelm@5217
   685
correctly (also ZF);
berghofe@5214
   686
wenzelm@5217
   687
INCOMPATIBILITIES: requires Inductive as an ancestor; component
wenzelm@5217
   688
"mutual_induct" no longer exists - the induction rule is always
wenzelm@5217
   689
contained in "induct";
wenzelm@5217
   690
wenzelm@5217
   691
wenzelm@5217
   692
* HOL/datatype package re-implemented and greatly improved: now
paulson@5267
   693
supports mutually recursive datatypes such as
wenzelm@5217
   694
wenzelm@5217
   695
  datatype
wenzelm@5217
   696
    'a aexp = IF_THEN_ELSE ('a bexp) ('a aexp) ('a aexp)
wenzelm@5217
   697
            | SUM ('a aexp) ('a aexp)
wenzelm@5217
   698
            | DIFF ('a aexp) ('a aexp)
wenzelm@5217
   699
            | NUM 'a
wenzelm@5217
   700
  and
wenzelm@5217
   701
    'a bexp = LESS ('a aexp) ('a aexp)
wenzelm@5217
   702
            | AND ('a bexp) ('a bexp)
wenzelm@5217
   703
            | OR ('a bexp) ('a bexp)
wenzelm@5217
   704
paulson@5267
   705
as well as indirectly recursive datatypes such as
berghofe@5214
   706
wenzelm@5217
   707
  datatype
wenzelm@5217
   708
    ('a, 'b) term = Var 'a
wenzelm@5217
   709
                  | App 'b ((('a, 'b) term) list)
berghofe@5214
   710
wenzelm@5217
   711
The new tactic  mutual_induct_tac [<var_1>, ..., <var_n>] i  performs
wenzelm@5217
   712
induction on mutually / indirectly recursive datatypes.
wenzelm@5217
   713
wenzelm@5217
   714
Primrec equations are now stored in theory and can be accessed via
wenzelm@5217
   715
<function_name>.simps.
wenzelm@5217
   716
wenzelm@5217
   717
INCOMPATIBILITIES:
berghofe@5214
   718
wenzelm@5217
   719
  - Theories using datatypes must now have theory Datatype as an
wenzelm@5217
   720
    ancestor.
wenzelm@5217
   721
  - The specific <typename>.induct_tac no longer exists - use the
wenzelm@5217
   722
    generic induct_tac instead.
berghofe@5226
   723
  - natE has been renamed to nat.exhaust - use exhaust_tac
wenzelm@5217
   724
    instead of res_inst_tac ... natE. Note that the variable
berghofe@5226
   725
    names in nat.exhaust differ from the names in natE, this
wenzelm@5217
   726
    may cause some "fragile" proofs to fail.
wenzelm@5217
   727
  - The theorems split_<typename>_case and split_<typename>_case_asm
wenzelm@5217
   728
    have been renamed to <typename>.split and <typename>.split_asm.
wenzelm@5217
   729
  - Since default sorts of type variables are now handled correctly,
wenzelm@5217
   730
    some datatype definitions may have to be annotated with explicit
wenzelm@5217
   731
    sort constraints.
wenzelm@5217
   732
  - Primrec definitions no longer require function name and type
wenzelm@5217
   733
    of recursive argument.
berghofe@5214
   734
wenzelm@5217
   735
Consider using isatool fixdatatype to adapt your theories and proof
wenzelm@5217
   736
scripts to the new package (backup your sources first!).
wenzelm@5217
   737
wenzelm@5217
   738
wenzelm@5726
   739
* HOL/record package: considerably improved implementation; now
wenzelm@5726
   740
includes concrete syntax for record types, terms, updates; theorems
wenzelm@5726
   741
for surjective pairing and splitting !!-bound record variables; proof
wenzelm@5726
   742
support is as follows:
wenzelm@5726
   743
wenzelm@5726
   744
  1) standard conversions (selectors or updates applied to record
wenzelm@5726
   745
constructor terms) are part of the standard simpset;
wenzelm@5726
   746
wenzelm@5726
   747
  2) inject equations of the form ((x, y) = (x', y')) == x=x' & y=y' are
wenzelm@5726
   748
made part of standard simpset and claset via addIffs;
wenzelm@5726
   749
wenzelm@5726
   750
  3) a tactic for record field splitting (record_split_tac) is part of
wenzelm@5726
   751
the standard claset (addSWrapper);
wenzelm@5726
   752
wenzelm@5726
   753
To get a better idea about these rules you may retrieve them via
wenzelm@5726
   754
something like 'thms "foo.simps"' or 'thms "foo.iffs"', where "foo" is
wenzelm@5726
   755
the name of your record type.
wenzelm@5726
   756
wenzelm@5726
   757
The split tactic 3) conceptually simplifies by the following rule:
wenzelm@5726
   758
wenzelm@5726
   759
  "(!!x. PROP ?P x) == (!!a b. PROP ?P (a, b))"
wenzelm@5726
   760
wenzelm@5726
   761
Thus any record variable that is bound by meta-all will automatically
wenzelm@5726
   762
blow up into some record constructor term, consequently the
wenzelm@5726
   763
simplifications of 1), 2) apply.  Thus force_tac, auto_tac etc. shall
wenzelm@5726
   764
solve record problems automatically.
wenzelm@5726
   765
berghofe@5214
   766
wenzelm@5125
   767
* reorganized the main HOL image: HOL/Integ and String loaded by
wenzelm@5125
   768
default; theory Main includes everything;
wenzelm@5125
   769
paulson@5650
   770
* automatic simplification of integer sums and comparisons, using cancellation;
paulson@5650
   771
oheimb@5526
   772
* added option_map_eq_Some and not_Some_eq to the default simpset and claset;
wenzelm@5127
   773
wenzelm@5127
   774
* added disj_not1 = "(~P | Q) = (P --> Q)" to the default simpset;
wenzelm@5127
   775
wenzelm@5127
   776
* many new identities for unions, intersections, set difference, etc.;
wenzelm@5127
   777
wenzelm@5127
   778
* expand_if, expand_split, expand_sum_case and expand_nat_case are now
wenzelm@5127
   779
called split_if, split_split, split_sum_case and split_nat_case (to go
wenzelm@5127
   780
with add/delsplits);
wenzelm@5125
   781
wenzelm@5127
   782
* HOL/Prod introduces simplification procedure unit_eq_proc rewriting
wenzelm@5127
   783
(?x::unit) = (); this is made part of the default simpset, which COULD
wenzelm@5127
   784
MAKE EXISTING PROOFS FAIL under rare circumstances (consider
wenzelm@5207
   785
'Delsimprocs [unit_eq_proc];' as last resort); also note that
wenzelm@5207
   786
unit_abs_eta_conv is added in order to counter the effect of
wenzelm@5207
   787
unit_eq_proc on (%u::unit. f u), replacing it by f rather than by
wenzelm@5207
   788
%u.f();
wenzelm@5125
   789
wenzelm@5217
   790
* HOL/Fun INCOMPATIBILITY: `inj_onto' is now called `inj_on' (which
wenzelm@5217
   791
makes more sense);
berghofe@5109
   792
paulson@5475
   793
* HOL/Set INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
   794
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
   795
  disjointness reasoning but breaking a few old proofs.
paulson@5267
   796
wenzelm@5217
   797
* HOL/Relation INCOMPATIBILITY: renamed the relational operator r^-1
wenzelm@5217
   798
to 'converse' from 'inverse' (for compatibility with ZF and some
wenzelm@5217
   799
literature);
wenzelm@5085
   800
wenzelm@5127
   801
* HOL/recdef can now declare non-recursive functions, with {} supplied as
wenzelm@5127
   802
the well-founded relation;
oheimb@4838
   803
paulson@5490
   804
* HOL/Set INCOMPATIBILITY: the complement of set A is now written -A instead of
paulson@5490
   805
    Compl A.  The "Compl" syntax remains available as input syntax for this
paulson@5490
   806
    release ONLY.
paulson@5490
   807
wenzelm@5127
   808
* HOL/Update: new theory of function updates:
wenzelm@5127
   809
    f(a:=b) == %x. if x=a then b else f x
wenzelm@5127
   810
may also be iterated as in f(a:=b,c:=d,...);
nipkow@5077
   811
wenzelm@5127
   812
* HOL/Vimage: new theory for inverse image of a function, syntax f-``B;
paulson@4899
   813
nipkow@5282
   814
* HOL/List:
nipkow@5282
   815
  - new function list_update written xs[i:=v] that updates the i-th
nipkow@5282
   816
    list position. May also be iterated as in xs[i:=a,j:=b,...].
nipkow@5428
   817
  - new function `upt' written [i..j(] which generates the list
nipkow@5428
   818
    [i,i+1,...,j-1], i.e. the upper bound is excluded. To include the upper
nipkow@5428
   819
    bound write [i..j], which is a shorthand for [i..j+1(].
nipkow@5282
   820
  - new lexicographic orderings and corresponding wellfoundedness theorems.
paulson@4779
   821
wenzelm@5127
   822
* HOL/Arith:
wenzelm@5127
   823
  - removed 'pred' (predecessor) function;
wenzelm@5127
   824
  - generalized some theorems about n-1;
wenzelm@5127
   825
  - many new laws about "div" and "mod";
wenzelm@5127
   826
  - new laws about greatest common divisors (see theory ex/Primes);
oheimb@4766
   827
wenzelm@5127
   828
* HOL/Relation: renamed the relational operator r^-1 "converse"
wenzelm@4842
   829
instead of "inverse";
wenzelm@4711
   830
nipkow@5651
   831
* HOL/Induct/Multiset: a theory of multisets, including the wellfoundedness
nipkow@5651
   832
  of the multiset ordering;
nipkow@5651
   833
wenzelm@5127
   834
* directory HOL/Real: a construction of the reals using Dedekind cuts
nipkow@5651
   835
  (not included by default);
nipkow@4835
   836
wenzelm@5127
   837
* directory HOL/UNITY: Chandy and Misra's UNITY formalism;
wenzelm@4711
   838
nipkow@5651
   839
* directory HOL/Hoare: a new version of Hoare logic which permits many-sorted
nipkow@5651
   840
  programs, i.e. different program variables may have different types.
nipkow@5651
   841
paulson@5142
   842
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
   843
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
   844
  Now rew can involve either definitions or equalities (either == or =).
wenzelm@5002
   845
wenzelm@5363
   846
paulson@4879
   847
*** ZF ***
paulson@4879
   848
paulson@5332
   849
* theory Main includes everything; INCOMPATIBILITY: theory ZF.thy contains
paulson@5332
   850
  only the theorems proved on ZF.ML;
paulson@5160
   851
paulson@5475
   852
* ZF INCOMPATIBILITY: rule `equals0D' is now a well-formed destruct rule;
paulson@5475
   853
  It and 'sym RS equals0D' are now in the default  claset, giving automatic
paulson@5475
   854
  disjointness reasoning but breaking a few old proofs.
paulson@5267
   855
paulson@5160
   856
* ZF/Update: new theory of function updates
paulson@5160
   857
    with default rewrite rule  f(x:=y) ` z = if(z=x, y, f`z)
paulson@5160
   858
  may also be iterated as in f(a:=b,c:=d,...);
paulson@5160
   859
paulson@4879
   860
* in  let x=t in u(x), neither t nor u(x) has to be an FOL term.
oheimb@4649
   861
paulson@5142
   862
* calling (stac rew i) now fails if "rew" has no effect on the goal
paulson@5142
   863
  [previously, this check worked only if the rewrite rule was unconditional]
paulson@5308
   864
  Now rew can involve either definitions or equalities (either == or =).
paulson@5142
   865
paulson@5160
   866
* case_tac provided for compatibility with HOL
paulson@5160
   867
    (like the old excluded_middle_tac, but with subgoals swapped)
paulson@5160
   868
wenzelm@4842
   869
wenzelm@5127
   870
*** Internal programming interfaces ***
wenzelm@5002
   871
wenzelm@5251
   872
* Pure: several new basic modules made available for general use, see
wenzelm@5251
   873
also src/Pure/README;
wenzelm@5207
   874
wenzelm@5008
   875
* improved the theory data mechanism to support encapsulation (data
wenzelm@5008
   876
kind name replaced by private Object.kind, acting as authorization
wenzelm@5373
   877
key); new type-safe user interface via functor TheoryDataFun; generic
wenzelm@5373
   878
print_data function becomes basically useless;
wenzelm@5002
   879
wenzelm@5251
   880
* removed global_names compatibility flag -- all theory declarations
wenzelm@5251
   881
are qualified by default;
wenzelm@5251
   882
wenzelm@5085
   883
* module Pure/Syntax now offers quote / antiquote translation
wenzelm@5085
   884
functions (useful for Hoare logic etc. with implicit dependencies);
wenzelm@5373
   885
see HOL/ex/Antiquote for an example use;
wenzelm@5085
   886
wenzelm@5127
   887
* Simplifier now offers conversions (asm_)(full_)rewrite: simpset ->
wenzelm@5127
   888
cterm -> thm;
wenzelm@5127
   889
wenzelm@5207
   890
* new tactical CHANGED_GOAL for checking that a tactic modifies a
wenzelm@5207
   891
subgoal;
paulson@5142
   892
wenzelm@5251
   893
* Display.print_goals function moved to Locale.print_goals;
wenzelm@5251
   894
wenzelm@5731
   895
* standard print function for goals supports current_goals_markers
wenzelm@5731
   896
variable for marking begin of proof, end of proof, start of goal; the
wenzelm@5731
   897
default is ("", "", ""); setting current_goals_markers := ("<proof>",
wenzelm@5731
   898
"</proof>", "<goal>") causes SGML like tagged proof state printing,
wenzelm@5731
   899
for example;
wenzelm@5731
   900
wenzelm@5002
   901
wenzelm@5002
   902
wenzelm@4410
   903
New in Isabelle98 (January 1998)
wenzelm@4410
   904
--------------------------------
wenzelm@4410
   905
wenzelm@4410
   906
*** Overview of INCOMPATIBILITIES (see below for more details) ***
wenzelm@4410
   907
wenzelm@4410
   908
* changed lexical syntax of terms / types: dots made part of long
wenzelm@4410
   909
identifiers, e.g. "%x.x" no longer possible, should be "%x. x";
wenzelm@4410
   910
wenzelm@4410
   911
* simpset (and claset) reference variable replaced by functions
wenzelm@4410
   912
simpset / simpset_ref;
wenzelm@4410
   913
wenzelm@4410
   914
* no longer supports theory aliases (via merge) and non-trivial
wenzelm@4410
   915
implicit merge of thms' signatures;
wenzelm@4410
   916
wenzelm@4410
   917
* most internal names of constants changed due to qualified names;
wenzelm@4410
   918
wenzelm@4410
   919
* changed Pure/Sequence interface (see Pure/seq.ML);
wenzelm@4410
   920
wenzelm@3454
   921
paulson@3715
   922
*** General Changes ***
paulson@3715
   923
wenzelm@4174
   924
* hierachically structured name spaces (for consts, types, axms, thms
wenzelm@3943
   925
etc.); new lexical class 'longid' (e.g. Foo.bar.x) may render much of
wenzelm@4108
   926
old input syntactically incorrect (e.g. "%x.x"); COMPATIBILITY:
wenzelm@4108
   927
isatool fixdots ensures space after dots (e.g. "%x. x"); set
wenzelm@4174
   928
long_names for fully qualified output names; NOTE: ML programs
wenzelm@4174
   929
(special tactics, packages etc.) referring to internal names may have
wenzelm@4174
   930
to be adapted to cope with fully qualified names; in case of severe
wenzelm@4174
   931
backward campatibility problems try setting 'global_names' at compile
wenzelm@4174
   932
time to have enrything declared within a flat name space; one may also
wenzelm@4174
   933
fine tune name declarations in theories via the 'global' and 'local'
wenzelm@4174
   934
section;
wenzelm@4108
   935
wenzelm@4108
   936
* reimplemented the implicit simpset and claset using the new anytype
wenzelm@4108
   937
data filed in signatures; references simpset:simpset ref etc. are
wenzelm@4108
   938
replaced by functions simpset:unit->simpset and
wenzelm@4108
   939
simpset_ref:unit->simpset ref; COMPATIBILITY: use isatool fixclasimp
wenzelm@4108
   940
to patch your ML files accordingly;
paulson@3856
   941
wenzelm@3857
   942
* HTML output now includes theory graph data for display with Java
wenzelm@3857
   943
applet or isatool browser; data generated automatically via isatool
wenzelm@3901
   944
usedir (see -i option, ISABELLE_USEDIR_OPTIONS);
wenzelm@3857
   945
paulson@3856
   946
* defs may now be conditional; improved rewrite_goals_tac to handle
paulson@3856
   947
conditional equations;
paulson@3856
   948
wenzelm@4174
   949
* defs now admits additional type arguments, using TYPE('a) syntax;
wenzelm@4174
   950
wenzelm@3901
   951
* theory aliases via merge (e.g. M=A+B+C) no longer supported, always
wenzelm@3901
   952
creates a new theory node; implicit merge of thms' signatures is
wenzelm@4112
   953
restricted to 'trivial' ones; COMPATIBILITY: one may have to use
wenzelm@3901
   954
transfer:theory->thm->thm in (rare) cases;
wenzelm@3901
   955
wenzelm@3968
   956
* improved handling of draft signatures / theories; draft thms (and
wenzelm@3968
   957
ctyps, cterms) are automatically promoted to real ones;
wenzelm@3968
   958
wenzelm@3901
   959
* slightly changed interfaces for oracles: admit many per theory, named
wenzelm@3901
   960
(e.g. oracle foo = mlfun), additional name argument for invoke_oracle;
wenzelm@3901
   961
wenzelm@3901
   962
* print_goals: optional output of const types (set show_consts and
wenzelm@3901
   963
show_types);
wenzelm@3851
   964
wenzelm@4388
   965
* improved output of warnings (###) and errors (***);
wenzelm@3697
   966
paulson@4178
   967
* subgoal_tac displays a warning if the new subgoal has type variables;
paulson@4178
   968
paulson@3715
   969
* removed old README and Makefiles;
wenzelm@3697
   970
paulson@3856
   971
* replaced print_goals_ref hook by print_current_goals_fn and result_error_fn;
wenzelm@3670
   972
paulson@3715
   973
* removed obsolete init_pps and init_database;
paulson@3715
   974
paulson@3715
   975
* deleted the obsolete tactical STATE, which was declared by
paulson@3715
   976
    fun STATE tacfun st = tacfun st st;
paulson@3715
   977
wenzelm@4388
   978
* cd and use now support path variables, e.g. $ISABELLE_HOME, or ~
wenzelm@4388
   979
(which abbreviates $HOME);
wenzelm@4269
   980
wenzelm@4269
   981
* changed Pure/Sequence interface (see Pure/seq.ML); COMPATIBILITY:
wenzelm@4269
   982
use isatool fixseq to adapt your ML programs (this works for fully
wenzelm@4269
   983
qualified references to the Sequence structure only!);
wenzelm@4269
   984
wenzelm@4381
   985
* use_thy no longer requires writable current directory; it always
wenzelm@4381
   986
reloads .ML *and* .thy file, if either one is out of date;
wenzelm@4269
   987
paulson@3715
   988
paulson@3715
   989
*** Classical Reasoner ***
paulson@3715
   990
wenzelm@3744
   991
* Clarify_tac, clarify_tac, clarify_step_tac, Clarify_step_tac: new
wenzelm@3744
   992
tactics that use classical reasoning to simplify a subgoal without
wenzelm@3744
   993
splitting it into several subgoals;
paulson@3715
   994
paulson@3719
   995
* Safe_tac: like safe_tac but uses the default claset;
paulson@3719
   996
paulson@3715
   997
paulson@3715
   998
*** Simplifier ***
paulson@3715
   999
paulson@3715
  1000
* added simplification meta rules:
paulson@3715
  1001
    (asm_)(full_)simplify: simpset -> thm -> thm;
paulson@3715
  1002
paulson@3715
  1003
* simplifier.ML no longer part of Pure -- has to be loaded by object
paulson@3715
  1004
logics (again);
paulson@3715
  1005
paulson@3715
  1006
* added prems argument to simplification procedures;
paulson@3715
  1007
paulson@4325
  1008
* HOL, FOL, ZF: added infix function `addsplits':
paulson@4325
  1009
  instead of `<simpset> setloop (split_tac <thms>)'
paulson@4325
  1010
  you can simply write `<simpset> addsplits <thms>'
paulson@4325
  1011
paulson@3715
  1012
paulson@3715
  1013
*** Syntax ***
paulson@3715
  1014
wenzelm@4174
  1015
* TYPE('a) syntax for type reflection terms;
wenzelm@4174
  1016
wenzelm@3985
  1017
* no longer handles consts with name "" -- declare as 'syntax' instead;
paulson@3856
  1018
paulson@3856
  1019
* pretty printer: changed order of mixfix annotation preference (again!);
wenzelm@3846
  1020
paulson@3715
  1021
* Pure: fixed idt/idts vs. pttrn/pttrns syntactic categories;
paulson@3715
  1022
paulson@3715
  1023
paulson@3715
  1024
*** HOL ***
paulson@3715
  1025
wenzelm@5726
  1026
* HOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  1027
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
  1028
nipkow@4035
  1029
* HOL/TLA: Stephan Merz's formalization of Lamport's Temporal Logic of Actions;
wenzelm@3985
  1030
wenzelm@3985
  1031
* HOL/Auth: new protocol proofs including some for the Internet
nipkow@4035
  1032
  protocol TLS;
wenzelm@3985
  1033
wenzelm@4125
  1034
* HOL/Map: new theory of `maps' a la VDM;
nipkow@3982
  1035
wenzelm@4335
  1036
* HOL/simplifier: simplification procedures nat_cancel_sums for
wenzelm@4335
  1037
cancelling out common nat summands from =, <, <= (in)equalities, or
wenzelm@4335
  1038
differences; simplification procedures nat_cancel_factor for
wenzelm@4335
  1039
cancelling common factor from =, <, <= (in)equalities over natural
wenzelm@4373
  1040
sums; nat_cancel contains both kinds of procedures, it is installed by
wenzelm@4373
  1041
default in Arith.thy -- this COULD MAKE EXISTING PROOFS FAIL;
wenzelm@4335
  1042
nipkow@3580
  1043
* HOL/simplifier: terms of the form
paulson@4325
  1044
  `? x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x)'  (or t=x)
nipkow@3580
  1045
  are rewritten to
nipkow@4035
  1046
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t)',
nipkow@4035
  1047
  and those of the form
paulson@4325
  1048
  `! x. P1(x) & ... & Pn(x) & x=t & Q1(x) & ... Qn(x) --> R(x)'  (or t=x)
nipkow@4035
  1049
  are rewritten to
nipkow@4035
  1050
  `P1(t) & ... & Pn(t) & Q1(t) & ... Qn(t) --> R(t)',
nipkow@4035
  1051
nipkow@4035
  1052
* HOL/datatype
nipkow@4035
  1053
  Each datatype `t' now comes with a theorem `split_t_case' of the form
nipkow@3580
  1054
nipkow@4035
  1055
  P(t_case f1 ... fn x) =
nipkow@4035
  1056
     ( (!y1 ... ym1. x = C1 y1 ... ym1 --> P(f1 y1 ... ym1)) &
nipkow@4035
  1057
        ...
oheimb@4189
  1058
       (!y1 ... ymn. x = Cn y1 ... ymn --> P(f1 y1 ... ymn))
nipkow@4035
  1059
     )
nipkow@4035
  1060
oheimb@4930
  1061
  and a theorem `split_t_case_asm' of the form
oheimb@4189
  1062
oheimb@4189
  1063
  P(t_case f1 ... fn x) =
oheimb@4189
  1064
    ~( (? y1 ... ym1. x = C1 y1 ... ym1 & ~P(f1 y1 ... ym1)) |
oheimb@4189
  1065
        ...
oheimb@4189
  1066
       (? y1 ... ymn. x = Cn y1 ... ymn & ~P(f1 y1 ... ymn))
oheimb@4189
  1067
     )
oheimb@4930
  1068
  which can be added to a simpset via `addsplits'. The existing theorems
oheimb@4930
  1069
  expand_list_case and expand_option_case have been renamed to
oheimb@4930
  1070
  split_list_case and split_option_case.
oheimb@4189
  1071
nipkow@4361
  1072
* HOL/Arithmetic:
nipkow@4361
  1073
  - `pred n' is automatically converted to `n-1'.
nipkow@4361
  1074
    Users are strongly encouraged not to use `pred' any longer,
nipkow@4361
  1075
    because it will disappear altogether at some point.
nipkow@4361
  1076
  - Users are strongly encouraged to write "0 < n" rather than
nipkow@4361
  1077
    "n ~= 0". Theorems and proof tools have been modified towards this
nipkow@4361
  1078
    `standard'.
nipkow@4357
  1079
nipkow@4502
  1080
* HOL/Lists:
nipkow@4502
  1081
  the function "set_of_list" has been renamed "set" (and its theorems too);
nipkow@4502
  1082
  the function "nth" now takes its arguments in the reverse order and
nipkow@4502
  1083
  has acquired the infix notation "!" as in "xs!n".
paulson@3570
  1084
paulson@4154
  1085
* HOL/Set: UNIV is now a constant and is no longer translated to Compl{};
paulson@4154
  1086
paulson@4154
  1087
* HOL/Set: The operator (UN x.B x) now abbreviates (UN x:UNIV. B x) and its
paulson@4154
  1088
  specialist theorems (like UN1_I) are gone.  Similarly for (INT x.B x);
paulson@4154
  1089
wenzelm@4575
  1090
* HOL/record: extensible records with schematic structural subtyping
wenzelm@4575
  1091
(single inheritance); EXPERIMENTAL version demonstrating the encoding,
wenzelm@4575
  1092
still lacks various theorems and concrete record syntax;
wenzelm@4575
  1093
wenzelm@4125
  1094
paulson@3715
  1095
*** HOLCF ***
wenzelm@3535
  1096
wenzelm@4125
  1097
* removed "axioms" and "generated by" sections;
wenzelm@4125
  1098
oheimb@4123
  1099
* replaced "ops" section by extended "consts" section, which is capable of
wenzelm@4125
  1100
  handling the continuous function space "->" directly;
wenzelm@4125
  1101
wenzelm@4125
  1102
* domain package:
wenzelm@4125
  1103
  . proves theorems immediately and stores them in the theory,
wenzelm@4125
  1104
  . creates hierachical name space,
wenzelm@4125
  1105
  . now uses normal mixfix annotations (instead of cinfix...),
wenzelm@4125
  1106
  . minor changes to some names and values (for consistency),
wenzelm@4125
  1107
  . e.g. cases -> casedist, dists_eq -> dist_eqs, [take_lemma] -> take_lemmas,
wenzelm@4125
  1108
  . separator between mutual domain defs: changed "," to "and",
wenzelm@4125
  1109
  . improved handling of sort constraints;  now they have to
wenzelm@4125
  1110
    appear on the left-hand side of the equations only;
oheimb@4123
  1111
oheimb@4123
  1112
* fixed LAM <x,y,zs>.b syntax;
wenzelm@3567
  1113
wenzelm@3744
  1114
* added extended adm_tac to simplifier in HOLCF -- can now discharge
wenzelm@3744
  1115
adm (%x. P (t x)), where P is chainfinite and t continuous;
wenzelm@3579
  1116
wenzelm@3579
  1117
paulson@3719
  1118
*** FOL and ZF ***
paulson@3719
  1119
wenzelm@5726
  1120
* FOL: there is a new splitter `split_asm_tac' that can be used e.g.
oheimb@4189
  1121
  with `addloop' of the simplifier to faciliate case splitting in premises.
oheimb@4189
  1122
wenzelm@3744
  1123
* qed_spec_mp, qed_goal_spec_mp, qed_goalw_spec_mp are available, as
wenzelm@3744
  1124
in HOL, they strip ALL and --> from proved theorems;
wenzelm@3744
  1125
paulson@3719
  1126
wenzelm@3579
  1127
wenzelm@3006
  1128
New in Isabelle94-8 (May 1997)
wenzelm@3006
  1129
------------------------------
wenzelm@2654
  1130
paulson@3002
  1131
*** General Changes ***
paulson@3002
  1132
paulson@3002
  1133
* new utilities to build / run / maintain Isabelle etc. (in parts
paulson@3002
  1134
still somewhat experimental); old Makefiles etc. still functional;
wenzelm@2971
  1135
wenzelm@3205
  1136
* new 'Isabelle System Manual';
wenzelm@3205
  1137
wenzelm@2825
  1138
* INSTALL text, together with ./configure and ./build scripts;
wenzelm@2773
  1139
wenzelm@3006
  1140
* reimplemented type inference for greater efficiency, better error
wenzelm@3006
  1141
messages and clean internal interface;
paulson@3002
  1142
paulson@3002
  1143
* prlim command for dealing with lots of subgoals (an easier way of
paulson@3002
  1144
setting goals_limit);
paulson@3002
  1145
wenzelm@3006
  1146
wenzelm@3006
  1147
*** Syntax ***
paulson@3002
  1148
wenzelm@3116
  1149
* supports alternative (named) syntax tables (parser and pretty
wenzelm@3116
  1150
printer); internal interface is provided by add_modesyntax(_i);
wenzelm@3116
  1151
paulson@3002
  1152
* Pure, FOL, ZF, HOL, HOLCF now support symbolic input and output; to
paulson@3002
  1153
be used in conjunction with the Isabelle symbol font; uses the
paulson@3002
  1154
"symbols" syntax table;
paulson@3002
  1155
wenzelm@2705
  1156
* added token_translation interface (may translate name tokens in
wenzelm@2756
  1157
arbitrary ways, dependent on their type (free, bound, tfree, ...) and
wenzelm@3116
  1158
the current print_mode); IMPORTANT: user print translation functions
wenzelm@3116
  1159
are responsible for marking newly introduced bounds
wenzelm@3116
  1160
(Syntax.mark_boundT);
wenzelm@2705
  1161
wenzelm@2730
  1162
* token translations for modes "xterm" and "xterm_color" that display
wenzelm@3006
  1163
names in bold, underline etc. or colors (which requires a color
wenzelm@3006
  1164
version of xterm);
wenzelm@2730
  1165
paulson@3002
  1166
* infixes may now be declared with names independent of their syntax;
paulson@3002
  1167
paulson@3002
  1168
* added typed_print_translation (like print_translation, but may
paulson@3002
  1169
access type of constant);
paulson@3002
  1170
wenzelm@3006
  1171
paulson@3002
  1172
*** Classical Reasoner ***
paulson@3002
  1173
paulson@3002
  1174
Blast_tac: a new tactic!  It is often more powerful than fast_tac, but has
paulson@3002
  1175
some limitations.  Blast_tac...
paulson@3002
  1176
  + ignores addss, addbefore, addafter; this restriction is intrinsic
paulson@3002
  1177
  + ignores elimination rules that don't have the correct format
wenzelm@5726
  1178
        (the conclusion MUST be a formula variable)
paulson@3002
  1179
  + ignores types, which can make HOL proofs fail
paulson@3002
  1180
  + rules must not require higher-order unification, e.g. apply_type in ZF
paulson@3002
  1181
    [message "Function Var's argument not a bound variable" relates to this]
paulson@3002
  1182
  + its proof strategy is more general but can actually be slower
paulson@3002
  1183
wenzelm@3107
  1184
* substitution with equality assumptions no longer permutes other
wenzelm@3107
  1185
assumptions;
paulson@3002
  1186
paulson@3002
  1187
* minor changes in semantics of addafter (now called addaltern); renamed
paulson@3002
  1188
setwrapper to setWrapper and compwrapper to compWrapper; added safe wrapper
wenzelm@3107
  1189
(and access functions for it);
paulson@3002
  1190
wenzelm@5726
  1191
* improved combination of classical reasoner and simplifier:
oheimb@3317
  1192
  + functions for handling clasimpsets
oheimb@3317
  1193
  + improvement of addss: now the simplifier is called _after_ the
oheimb@3317
  1194
    safe steps.
oheimb@3317
  1195
  + safe variant of addss called addSss: uses safe simplifications
wenzelm@5726
  1196
    _during_ the safe steps. It is more complete as it allows multiple
oheimb@3317
  1197
    instantiations of unknowns (e.g. with slow_tac).
wenzelm@3006
  1198
paulson@3002
  1199
*** Simplifier ***
paulson@3002
  1200
wenzelm@3006
  1201
* added interface for simplification procedures (functions that
wenzelm@3006
  1202
produce *proven* rewrite rules on the fly, depending on current
wenzelm@3006
  1203
redex);
wenzelm@3006
  1204
wenzelm@3006
  1205
* ordering on terms as parameter (used for ordered rewriting);
wenzelm@3006
  1206
wenzelm@3107
  1207
* new functions delcongs, deleqcongs, and Delcongs. richer rep_ss;
paulson@3002
  1208
paulson@3002
  1209
* the solver is now split into a safe and an unsafe part.
paulson@3002
  1210
This should be invisible for the normal user, except that the
paulson@3002
  1211
functions setsolver and addsolver have been renamed to setSolver and
wenzelm@3107
  1212
addSolver; added safe_asm_full_simp_tac;
paulson@3002
  1213
paulson@3002
  1214
paulson@3002
  1215
*** HOL ***
paulson@3002
  1216
nipkow@3042
  1217
* a generic induction tactic `induct_tac' which works for all datatypes and
wenzelm@3107
  1218
also for type `nat';
nipkow@3042
  1219
nipkow@3316
  1220
* a generic case distinction tactic `exhaust_tac' which works for all
nipkow@3316
  1221
datatypes and also for type `nat';
nipkow@3316
  1222
nipkow@3316
  1223
* each datatype comes with a function `size';
nipkow@3316
  1224
paulson@3002
  1225
* patterns in case expressions allow tuple patterns as arguments to
wenzelm@3107
  1226
constructors, for example `case x of [] => ... | (x,y,z)#ps => ...';
paulson@3002
  1227
paulson@3002
  1228
* primrec now also works with type nat;
paulson@3002
  1229
paulson@3338
  1230
* recdef: a new declaration form, allows general recursive functions to be
paulson@3338
  1231
defined in theory files.  See HOL/ex/Fib, HOL/ex/Primes, HOL/Subst/Unify.
paulson@3338
  1232
paulson@3002
  1233
* the constant for negation has been renamed from "not" to "Not" to
wenzelm@3107
  1234
harmonize with FOL, ZF, LK, etc.;
paulson@3002
  1235
wenzelm@3107
  1236
* HOL/ex/LFilter theory of a corecursive "filter" functional for
wenzelm@3107
  1237
infinite lists;
paulson@3002
  1238
wenzelm@3227
  1239
* HOL/Modelcheck demonstrates invocation of model checker oracle;
wenzelm@3227
  1240
paulson@3002
  1241
* HOL/ex/Ring.thy declares cring_simp, which solves equational
paulson@3002
  1242
problems in commutative rings, using axiomatic type classes for + and *;
paulson@3002
  1243
paulson@3002
  1244
* more examples in HOL/MiniML and HOL/Auth;
paulson@3002
  1245
paulson@3002
  1246
* more default rewrite rules for quantifiers, union/intersection;
paulson@3002
  1247
nipkow@3321
  1248
* a new constant `arbitrary == @x.False';
nipkow@3321
  1249
wenzelm@3107
  1250
* HOLCF/IOA replaces old HOL/IOA;
wenzelm@3107
  1251
wenzelm@5726
  1252
* HOLCF changes: derived all rules and arities
wenzelm@5726
  1253
  + axiomatic type classes instead of classes
slotosch@2653
  1254
  + typedef instead of faking type definitions
paulson@2747
  1255
  + eliminated the internal constants less_fun, less_cfun, UU_fun, UU_cfun etc.
wenzelm@2730
  1256
  + new axclasses cpo, chfin, flat with flat < chfin < pcpo < cpo < po
slotosch@2653
  1257
  + eliminated the types void, one, tr
slotosch@2653
  1258
  + use unit lift and bool lift (with translations) instead of one and tr
slotosch@2653
  1259
  + eliminated blift from Lift3.thy (use Def instead of blift)
wenzelm@3107
  1260
  all eliminated rules are derived as theorems --> no visible changes ;
oheimb@2649
  1261
wenzelm@3006
  1262
paulson@3002
  1263
*** ZF ***
wenzelm@2553
  1264
paulson@2865
  1265
* ZF now has Fast_tac, Simp_tac and Auto_tac.  Union_iff is a now a default
paulson@2865
  1266
rewrite rule; this may affect some proofs.  eq_cs is gone but can be put back
paulson@2865
  1267
as ZF_cs addSIs [equalityI];
wenzelm@2553
  1268
wenzelm@2554
  1269
wenzelm@2732
  1270
wenzelm@2553
  1271
New in Isabelle94-7 (November 96)
wenzelm@2553
  1272
---------------------------------
wenzelm@2553
  1273
wenzelm@2553
  1274
* allowing negative levels (as offsets) in prlev and choplev;
wenzelm@2553
  1275
wenzelm@2554
  1276
* super-linear speedup for large simplifications;
wenzelm@2554
  1277
wenzelm@2554
  1278
* FOL, ZF and HOL now use miniscoping: rewriting pushes
wenzelm@2554
  1279
quantifications in as far as possible (COULD MAKE EXISTING PROOFS
wenzelm@2554
  1280
FAIL); can suppress it using the command Delsimps (ex_simps @
wenzelm@2554
  1281
all_simps); De Morgan laws are also now included, by default;
wenzelm@2554
  1282
wenzelm@2554
  1283
* improved printing of ==>  :  ~:
wenzelm@2554
  1284
wenzelm@2554
  1285
* new object-logic "Sequents" adds linear logic, while replacing LK
wenzelm@2554
  1286
and Modal (thanks to Sara Kalvala);
wenzelm@2554
  1287
wenzelm@2554
  1288
* HOL/Auth: correctness proofs for authentication protocols;
wenzelm@2554
  1289
wenzelm@2554
  1290
* HOL: new auto_tac combines rewriting and classical reasoning (many
wenzelm@2554
  1291
examples on HOL/Auth);
wenzelm@2554
  1292
wenzelm@2554
  1293
* HOL: new command AddIffs for declaring theorems of the form P=Q to
wenzelm@2554
  1294
the rewriter and classical reasoner simultaneously;
wenzelm@2554
  1295
wenzelm@2554
  1296
* function uresult no longer returns theorems in "standard" format;
wenzelm@2554
  1297
regain previous version by: val uresult = standard o uresult;
wenzelm@2554
  1298
wenzelm@2554
  1299
wenzelm@2554
  1300
wenzelm@2554
  1301
New in Isabelle94-6
wenzelm@2554
  1302
-------------------
wenzelm@2554
  1303
wenzelm@2554
  1304
* oracles -- these establish an interface between Isabelle and trusted
wenzelm@2554
  1305
external reasoners, which may deliver results as theorems;
wenzelm@2554
  1306
wenzelm@2554
  1307
* proof objects (in particular record all uses of oracles);
wenzelm@2554
  1308
wenzelm@2554
  1309
* Simp_tac, Fast_tac, etc. that refer to implicit simpset / claset;
wenzelm@2554
  1310
wenzelm@2554
  1311
* "constdefs" section in theory files;
wenzelm@2554
  1312
wenzelm@2554
  1313
* "primrec" section (HOL) no longer requires names;
wenzelm@2554
  1314
wenzelm@2554
  1315
* internal type "tactic" now simply "thm -> thm Sequence.seq";
wenzelm@2554
  1316
wenzelm@2554
  1317
wenzelm@2554
  1318
wenzelm@2554
  1319
New in Isabelle94-5
wenzelm@2554
  1320
-------------------
wenzelm@2554
  1321
wenzelm@2554
  1322
* reduced space requirements;
wenzelm@2554
  1323
wenzelm@2554
  1324
* automatic HTML generation from theories;
wenzelm@2554
  1325
wenzelm@2554
  1326
* theory files no longer require "..." (quotes) around most types;
wenzelm@2554
  1327
wenzelm@2554
  1328
* new examples, including two proofs of the Church-Rosser theorem;
wenzelm@2554
  1329
wenzelm@2554
  1330
* non-curried (1994) version of HOL is no longer distributed;
wenzelm@2554
  1331
wenzelm@2553
  1332
paulson@2557
  1333
paulson@2557
  1334
New in Isabelle94-4
paulson@2557
  1335
-------------------
paulson@2557
  1336
paulson@2747
  1337
* greatly reduced space requirements;
paulson@2557
  1338
paulson@2557
  1339
* theory files (.thy) no longer require \...\ escapes at line breaks;
paulson@2557
  1340
wenzelm@5726
  1341
* searchable theorem database (see the section "Retrieving theorems" on
paulson@2557
  1342
page 8 of the Reference Manual);
paulson@2557
  1343
paulson@2557
  1344
* new examples, including Grabczewski's monumental case study of the
paulson@2557
  1345
Axiom of Choice;
paulson@2557
  1346
paulson@2557
  1347
* The previous version of HOL renamed to Old_HOL;
paulson@2557
  1348
wenzelm@5726
  1349
* The new version of HOL (previously called CHOL) uses a curried syntax
paulson@2557
  1350
for functions.  Application looks like f a b instead of f(a,b);
paulson@2557
  1351
paulson@2557
  1352
* Mutually recursive inductive definitions finally work in HOL;
paulson@2557
  1353
paulson@2557
  1354
* In ZF, pattern-matching on tuples is now available in all abstractions and
paulson@2557
  1355
translates to the operator "split";
paulson@2557
  1356
paulson@2557
  1357
paulson@2557
  1358
paulson@2557
  1359
New in Isabelle94-3
paulson@2557
  1360
-------------------
paulson@2557
  1361
wenzelm@5726
  1362
* new infix operator, addss, allowing the classical reasoner to
paulson@2557
  1363
perform simplification at each step of its search.  Example:
wenzelm@5726
  1364
        fast_tac (cs addss ss)
paulson@2557
  1365
wenzelm@5726
  1366
* a new logic, CHOL, the same as HOL, but with a curried syntax
wenzelm@5726
  1367
for functions.  Application looks like f a b instead of f(a,b).  Also pairs
paulson@2557
  1368
look like (a,b) instead of <a,b>;
paulson@2557
  1369
paulson@2557
  1370
* PLEASE NOTE: CHOL will eventually replace HOL!
paulson@2557
  1371
paulson@2557
  1372
* In CHOL, pattern-matching on tuples is now available in all abstractions.
paulson@2557
  1373
It translates to the operator "split".  A new theory of integers is available;
paulson@2557
  1374
paulson@2557
  1375
* In ZF, integer numerals now denote two's-complement binary integers.
paulson@2557
  1376
Arithmetic operations can be performed by rewriting.  See ZF/ex/Bin.ML;
paulson@2557
  1377
wenzelm@5726
  1378
* Many new examples: I/O automata, Church-Rosser theorem, equivalents
paulson@2557
  1379
of the Axiom of Choice;
paulson@2557
  1380
paulson@2557
  1381
paulson@2557
  1382
paulson@2557
  1383
New in Isabelle94-2
paulson@2557
  1384
-------------------
paulson@2557
  1385
wenzelm@5726
  1386
* Significantly faster resolution;
paulson@2557
  1387
paulson@2557
  1388
* the different sections in a .thy file can now be mixed and repeated
paulson@2557
  1389
freely;
paulson@2557
  1390
paulson@2557
  1391
* Database of theorems for FOL, HOL and ZF.  New
paulson@2557
  1392
commands including qed, qed_goal and bind_thm store theorems in the database.
paulson@2557
  1393
paulson@2557
  1394
* Simple database queries: return a named theorem (get_thm) or all theorems of
paulson@2557
  1395
a given theory (thms_of), or find out what theory a theorem was proved in
paulson@2557
  1396
(theory_of_thm);
paulson@2557
  1397
paulson@2557
  1398
* Bugs fixed in the inductive definition and datatype packages;
paulson@2557
  1399
paulson@2557
  1400
* The classical reasoner provides deepen_tac and depth_tac, making FOL_dup_cs
paulson@2557
  1401
and HOL_dup_cs obsolete;
paulson@2557
  1402
paulson@2557
  1403
* Syntactic ambiguities caused by the new treatment of syntax in Isabelle94-1
paulson@2557
  1404
have been removed;
paulson@2557
  1405
paulson@2557
  1406
* Simpler definition of function space in ZF;
paulson@2557
  1407
paulson@2557
  1408
* new results about cardinal and ordinal arithmetic in ZF;
paulson@2557
  1409
paulson@2557
  1410
* 'subtype' facility in HOL for introducing new types as subsets of existing
paulson@2557
  1411
types;
paulson@2557
  1412
paulson@2557
  1413
wenzelm@2553
  1414
$Id$