NEWS
author wenzelm
Mon May 05 21:18:01 1997 +0200 (1997-05-05)
changeset 3107 492a3d5d2b17
parent 3042 21cd332b65d3
child 3116 b890bae4273e
permissions -rw-r--r--
tuned;
wenzelm@2553
     1
wenzelm@2553
     2
Isabelle NEWS -- history of user-visible changes
wenzelm@2553
     3
================================================
wenzelm@2553
     4
wenzelm@3006
     5
New in Isabelle94-8 (May 1997)
wenzelm@3006
     6
------------------------------
wenzelm@2654
     7
paulson@3002
     8
*** General Changes ***
paulson@3002
     9
paulson@3002
    10
* new utilities to build / run / maintain Isabelle etc. (in parts
paulson@3002
    11
still somewhat experimental); old Makefiles etc. still functional;
wenzelm@2971
    12
wenzelm@2825
    13
* INSTALL text, together with ./configure and ./build scripts;
wenzelm@2773
    14
wenzelm@3006
    15
* reimplemented type inference for greater efficiency, better error
wenzelm@3006
    16
messages and clean internal interface;
paulson@3002
    17
paulson@3002
    18
* prlim command for dealing with lots of subgoals (an easier way of
paulson@3002
    19
setting goals_limit);
paulson@3002
    20
wenzelm@3006
    21
wenzelm@3006
    22
*** Syntax ***
paulson@3002
    23
paulson@3002
    24
* Pure, FOL, ZF, HOL, HOLCF now support symbolic input and output; to
paulson@3002
    25
be used in conjunction with the Isabelle symbol font; uses the
paulson@3002
    26
"symbols" syntax table;
paulson@3002
    27
wenzelm@2705
    28
* added token_translation interface (may translate name tokens in
wenzelm@2756
    29
arbitrary ways, dependent on their type (free, bound, tfree, ...) and
wenzelm@2756
    30
the current print_mode);
wenzelm@2705
    31
wenzelm@2730
    32
* token translations for modes "xterm" and "xterm_color" that display
wenzelm@3006
    33
names in bold, underline etc. or colors (which requires a color
wenzelm@3006
    34
version of xterm);
wenzelm@2730
    35
wenzelm@3107
    36
* supports alternative (named) syntax tables (parser and pretty
paulson@3002
    37
printer); internal interface is provided by add_modesyntax(_i);
paulson@3002
    38
paulson@3002
    39
* infixes may now be declared with names independent of their syntax;
paulson@3002
    40
paulson@3002
    41
* added typed_print_translation (like print_translation, but may
paulson@3002
    42
access type of constant);
paulson@3002
    43
wenzelm@3006
    44
paulson@3002
    45
*** Classical Reasoner ***
paulson@3002
    46
paulson@3002
    47
Blast_tac: a new tactic!  It is often more powerful than fast_tac, but has
paulson@3002
    48
some limitations.  Blast_tac...
paulson@3002
    49
  + ignores addss, addbefore, addafter; this restriction is intrinsic
paulson@3002
    50
  + ignores elimination rules that don't have the correct format
paulson@3002
    51
	(the conclusion MUST be a formula variable)
paulson@3002
    52
  + ignores types, which can make HOL proofs fail
paulson@3002
    53
  + rules must not require higher-order unification, e.g. apply_type in ZF
paulson@3002
    54
    [message "Function Var's argument not a bound variable" relates to this]
paulson@3002
    55
  + its proof strategy is more general but can actually be slower
paulson@3002
    56
wenzelm@3107
    57
* substitution with equality assumptions no longer permutes other
wenzelm@3107
    58
assumptions;
paulson@3002
    59
paulson@3002
    60
* minor changes in semantics of addafter (now called addaltern); renamed
paulson@3002
    61
setwrapper to setWrapper and compwrapper to compWrapper; added safe wrapper
wenzelm@3107
    62
(and access functions for it);
paulson@3002
    63
paulson@3002
    64
* improved combination of classical reasoner and simplifier: new
paulson@3002
    65
addss, auto_tac, functions for handling clasimpsets, ...  Now, the
paulson@3002
    66
simplification is safe (therefore moved to safe_step_tac) and thus
paulson@3002
    67
more complete, as multiple instantiation of unknowns (with slow_tac).
paulson@3002
    68
COULD MAKE EXISTING PROOFS FAIL; in case of problems with
wenzelm@3107
    69
old proofs, use unsafe_addss and unsafe_auto_tac;
paulson@3002
    70
wenzelm@3006
    71
paulson@3002
    72
*** Simplifier ***
paulson@3002
    73
wenzelm@3006
    74
* added interface for simplification procedures (functions that
wenzelm@3006
    75
produce *proven* rewrite rules on the fly, depending on current
wenzelm@3006
    76
redex);
wenzelm@3006
    77
wenzelm@3006
    78
* ordering on terms as parameter (used for ordered rewriting);
wenzelm@3006
    79
wenzelm@3107
    80
* new functions delcongs, deleqcongs, and Delcongs. richer rep_ss;
paulson@3002
    81
paulson@3002
    82
* the solver is now split into a safe and an unsafe part.
paulson@3002
    83
This should be invisible for the normal user, except that the
paulson@3002
    84
functions setsolver and addsolver have been renamed to setSolver and
wenzelm@3107
    85
addSolver; added safe_asm_full_simp_tac;
paulson@3002
    86
paulson@3002
    87
paulson@3002
    88
*** HOL ***
paulson@3002
    89
nipkow@3042
    90
* a generic induction tactic `induct_tac' which works for all datatypes and
wenzelm@3107
    91
also for type `nat';
nipkow@3042
    92
paulson@3002
    93
* patterns in case expressions allow tuple patterns as arguments to
wenzelm@3107
    94
constructors, for example `case x of [] => ... | (x,y,z)#ps => ...';
paulson@3002
    95
paulson@3002
    96
* primrec now also works with type nat;
paulson@3002
    97
paulson@3002
    98
* the constant for negation has been renamed from "not" to "Not" to
wenzelm@3107
    99
harmonize with FOL, ZF, LK, etc.;
paulson@3002
   100
wenzelm@3107
   101
* HOL/ex/LFilter theory of a corecursive "filter" functional for
wenzelm@3107
   102
infinite lists;
paulson@3002
   103
paulson@3002
   104
* HOL/ex/Ring.thy declares cring_simp, which solves equational
paulson@3002
   105
problems in commutative rings, using axiomatic type classes for + and *;
paulson@3002
   106
paulson@3002
   107
* more examples in HOL/MiniML and HOL/Auth;
paulson@3002
   108
paulson@3002
   109
* more default rewrite rules for quantifiers, union/intersection;
paulson@3002
   110
wenzelm@3107
   111
* HOLCF/IOA replaces old HOL/IOA;
wenzelm@3107
   112
slotosch@2653
   113
* HOLCF changes: derived all rules and arities 
slotosch@2653
   114
  + axiomatic type classes instead of classes 
slotosch@2653
   115
  + typedef instead of faking type definitions
paulson@2747
   116
  + eliminated the internal constants less_fun, less_cfun, UU_fun, UU_cfun etc.
wenzelm@2730
   117
  + new axclasses cpo, chfin, flat with flat < chfin < pcpo < cpo < po
slotosch@2653
   118
  + eliminated the types void, one, tr
slotosch@2653
   119
  + use unit lift and bool lift (with translations) instead of one and tr
slotosch@2653
   120
  + eliminated blift from Lift3.thy (use Def instead of blift)
wenzelm@3107
   121
  all eliminated rules are derived as theorems --> no visible changes ;
oheimb@2649
   122
wenzelm@3006
   123
paulson@3002
   124
*** ZF ***
wenzelm@2553
   125
paulson@2865
   126
* ZF now has Fast_tac, Simp_tac and Auto_tac.  Union_iff is a now a default
paulson@2865
   127
rewrite rule; this may affect some proofs.  eq_cs is gone but can be put back
paulson@2865
   128
as ZF_cs addSIs [equalityI];
wenzelm@2553
   129
wenzelm@2554
   130
wenzelm@2732
   131
wenzelm@2553
   132
New in Isabelle94-7 (November 96)
wenzelm@2553
   133
---------------------------------
wenzelm@2553
   134
wenzelm@2553
   135
* allowing negative levels (as offsets) in prlev and choplev;
wenzelm@2553
   136
wenzelm@2554
   137
* super-linear speedup for large simplifications;
wenzelm@2554
   138
wenzelm@2554
   139
* FOL, ZF and HOL now use miniscoping: rewriting pushes
wenzelm@2554
   140
quantifications in as far as possible (COULD MAKE EXISTING PROOFS
wenzelm@2554
   141
FAIL); can suppress it using the command Delsimps (ex_simps @
wenzelm@2554
   142
all_simps); De Morgan laws are also now included, by default;
wenzelm@2554
   143
wenzelm@2554
   144
* improved printing of ==>  :  ~:
wenzelm@2554
   145
wenzelm@2554
   146
* new object-logic "Sequents" adds linear logic, while replacing LK
wenzelm@2554
   147
and Modal (thanks to Sara Kalvala);
wenzelm@2554
   148
wenzelm@2554
   149
* HOL/Auth: correctness proofs for authentication protocols;
wenzelm@2554
   150
wenzelm@2554
   151
* HOL: new auto_tac combines rewriting and classical reasoning (many
wenzelm@2554
   152
examples on HOL/Auth);
wenzelm@2554
   153
wenzelm@2554
   154
* HOL: new command AddIffs for declaring theorems of the form P=Q to
wenzelm@2554
   155
the rewriter and classical reasoner simultaneously;
wenzelm@2554
   156
wenzelm@2554
   157
* function uresult no longer returns theorems in "standard" format;
wenzelm@2554
   158
regain previous version by: val uresult = standard o uresult;
wenzelm@2554
   159
wenzelm@2554
   160
wenzelm@2554
   161
wenzelm@2554
   162
New in Isabelle94-6
wenzelm@2554
   163
-------------------
wenzelm@2554
   164
wenzelm@2554
   165
* oracles -- these establish an interface between Isabelle and trusted
wenzelm@2554
   166
external reasoners, which may deliver results as theorems;
wenzelm@2554
   167
wenzelm@2554
   168
* proof objects (in particular record all uses of oracles);
wenzelm@2554
   169
wenzelm@2554
   170
* Simp_tac, Fast_tac, etc. that refer to implicit simpset / claset;
wenzelm@2554
   171
wenzelm@2554
   172
* "constdefs" section in theory files;
wenzelm@2554
   173
wenzelm@2554
   174
* "primrec" section (HOL) no longer requires names;
wenzelm@2554
   175
wenzelm@2554
   176
* internal type "tactic" now simply "thm -> thm Sequence.seq";
wenzelm@2554
   177
wenzelm@2554
   178
wenzelm@2554
   179
wenzelm@2554
   180
New in Isabelle94-5
wenzelm@2554
   181
-------------------
wenzelm@2554
   182
wenzelm@2554
   183
* reduced space requirements;
wenzelm@2554
   184
wenzelm@2554
   185
* automatic HTML generation from theories;
wenzelm@2554
   186
wenzelm@2554
   187
* theory files no longer require "..." (quotes) around most types;
wenzelm@2554
   188
wenzelm@2554
   189
* new examples, including two proofs of the Church-Rosser theorem;
wenzelm@2554
   190
wenzelm@2554
   191
* non-curried (1994) version of HOL is no longer distributed;
wenzelm@2554
   192
wenzelm@2553
   193
paulson@2557
   194
paulson@2557
   195
New in Isabelle94-4
paulson@2557
   196
-------------------
paulson@2557
   197
paulson@2747
   198
* greatly reduced space requirements;
paulson@2557
   199
paulson@2557
   200
* theory files (.thy) no longer require \...\ escapes at line breaks;
paulson@2557
   201
paulson@2557
   202
* searchable theorem database (see the section "Retrieving theorems" on 
paulson@2557
   203
page 8 of the Reference Manual);
paulson@2557
   204
paulson@2557
   205
* new examples, including Grabczewski's monumental case study of the
paulson@2557
   206
Axiom of Choice;
paulson@2557
   207
paulson@2557
   208
* The previous version of HOL renamed to Old_HOL;
paulson@2557
   209
paulson@2557
   210
* The new version of HOL (previously called CHOL) uses a curried syntax 
paulson@2557
   211
for functions.  Application looks like f a b instead of f(a,b);
paulson@2557
   212
paulson@2557
   213
* Mutually recursive inductive definitions finally work in HOL;
paulson@2557
   214
paulson@2557
   215
* In ZF, pattern-matching on tuples is now available in all abstractions and
paulson@2557
   216
translates to the operator "split";
paulson@2557
   217
paulson@2557
   218
paulson@2557
   219
paulson@2557
   220
New in Isabelle94-3
paulson@2557
   221
-------------------
paulson@2557
   222
paulson@2557
   223
* new infix operator, addss, allowing the classical reasoner to 
paulson@2557
   224
perform simplification at each step of its search.  Example:
paulson@2557
   225
	fast_tac (cs addss ss)
paulson@2557
   226
paulson@2557
   227
* a new logic, CHOL, the same as HOL, but with a curried syntax 
paulson@2557
   228
for functions.  Application looks like f a b instead of f(a,b).  Also pairs 
paulson@2557
   229
look like (a,b) instead of <a,b>;
paulson@2557
   230
paulson@2557
   231
* PLEASE NOTE: CHOL will eventually replace HOL!
paulson@2557
   232
paulson@2557
   233
* In CHOL, pattern-matching on tuples is now available in all abstractions.
paulson@2557
   234
It translates to the operator "split".  A new theory of integers is available;
paulson@2557
   235
paulson@2557
   236
* In ZF, integer numerals now denote two's-complement binary integers.
paulson@2557
   237
Arithmetic operations can be performed by rewriting.  See ZF/ex/Bin.ML;
paulson@2557
   238
paulson@2557
   239
* Many new examples: I/O automata, Church-Rosser theorem, equivalents 
paulson@2557
   240
of the Axiom of Choice;
paulson@2557
   241
paulson@2557
   242
paulson@2557
   243
paulson@2557
   244
New in Isabelle94-2
paulson@2557
   245
-------------------
paulson@2557
   246
paulson@2557
   247
* Significantly faster resolution;  
paulson@2557
   248
paulson@2557
   249
* the different sections in a .thy file can now be mixed and repeated
paulson@2557
   250
freely;
paulson@2557
   251
paulson@2557
   252
* Database of theorems for FOL, HOL and ZF.  New
paulson@2557
   253
commands including qed, qed_goal and bind_thm store theorems in the database.
paulson@2557
   254
paulson@2557
   255
* Simple database queries: return a named theorem (get_thm) or all theorems of
paulson@2557
   256
a given theory (thms_of), or find out what theory a theorem was proved in
paulson@2557
   257
(theory_of_thm);
paulson@2557
   258
paulson@2557
   259
* Bugs fixed in the inductive definition and datatype packages;
paulson@2557
   260
paulson@2557
   261
* The classical reasoner provides deepen_tac and depth_tac, making FOL_dup_cs
paulson@2557
   262
and HOL_dup_cs obsolete;
paulson@2557
   263
paulson@2557
   264
* Syntactic ambiguities caused by the new treatment of syntax in Isabelle94-1
paulson@2557
   265
have been removed;
paulson@2557
   266
paulson@2557
   267
* Simpler definition of function space in ZF;
paulson@2557
   268
paulson@2557
   269
* new results about cardinal and ordinal arithmetic in ZF;
paulson@2557
   270
paulson@2557
   271
* 'subtype' facility in HOL for introducing new types as subsets of existing
paulson@2557
   272
types;
paulson@2557
   273
paulson@2557
   274
wenzelm@2553
   275
$Id$