NEWS
author wenzelm
Fri Jan 24 18:36:30 1997 +0100 (1997-01-24)
changeset 2555 29b27a74c7d8
parent 2554 1b160cd50130
child 2556 bef8e1315cbc
permissions -rw-r--r--
*** empty log message ***
     1 
     2 Isabelle NEWS -- history of user-visible changes
     3 ================================================
     4 
     5 
     6 New in Isabelle94-8 (??????????? 1997 FIXME)
     7 ---------------------------------------
     8 
     9 * the NEWS file;
    10 
    11 * new utilities to build / run / maintain Isabelle etc. (in parts
    12 still somewhat experimental); old Makefiles etc. still functional;
    13 
    14 * simplifier: termless order as parameter; added interface for
    15 simplification procedures (functions that produce *proven* rewrite
    16 rules on the fly, depending on current redex);
    17 
    18 * now supports alternative (named) syntax tables (parser and pretty
    19 printer); internal interface is provided by add_modesyntax(_i);
    20 
    21 * Pure, FOL, ZF, HOL, HOLCF now support symbolic input and output; to
    22 be used in conjunction with the isabelle symbol font; uses the
    23 "symbols" syntax table;
    24 
    25 * infixes may now be declared with names independent of their syntax;
    26 
    27 * added typed_print_translation (like print_translation, but may
    28 access type of constant);
    29 
    30 * prlim command for dealing with lots of subgoals (an easier way of
    31 setting goals_limit);
    32 
    33 * HOL/ex/Ring.thy declares cring_simp, which solves equational
    34 problems in commutative rings, using axiomatic type classes for + and *;
    35 
    36 * ZF now has Fast_tac, Simp_tac and Auto_tac.  WARNING: don't use
    37 ZF.thy anymore!  Contains fewer defs and could make a bogus simpset.
    38 Beware of Union_iff.  eq_cs is gone, can be put back as ZF_cs addSIs
    39 [equalityI];
    40 
    41 * more examples in HOL/MiniML and HOL/Auth;
    42 
    43 * more default rewrite rules in HOL for quantifiers, union/intersection;
    44 
    45 
    46 
    47 New in Isabelle94-7 (November 96)
    48 ---------------------------------
    49 
    50 * allowing negative levels (as offsets) in prlev and choplev;
    51 
    52 * super-linear speedup for large simplifications;
    53 
    54 * FOL, ZF and HOL now use miniscoping: rewriting pushes
    55 quantifications in as far as possible (COULD MAKE EXISTING PROOFS
    56 FAIL); can suppress it using the command Delsimps (ex_simps @
    57 all_simps); De Morgan laws are also now included, by default;
    58 
    59 * improved printing of ==>  :  ~:
    60 
    61 * new object-logic "Sequents" adds linear logic, while replacing LK
    62 and Modal (thanks to Sara Kalvala);
    63 
    64 * HOL/Auth: correctness proofs for authentication protocols;
    65 
    66 * HOL: new auto_tac combines rewriting and classical reasoning (many
    67 examples on HOL/Auth);
    68 
    69 * HOL: new command AddIffs for declaring theorems of the form P=Q to
    70 the rewriter and classical reasoner simultaneously;
    71 
    72 * function uresult no longer returns theorems in "standard" format;
    73 regain previous version by: val uresult = standard o uresult;
    74 
    75 
    76 
    77 New in Isabelle94-6
    78 -------------------
    79 
    80 * oracles -- these establish an interface between Isabelle and trusted
    81 external reasoners, which may deliver results as theorems;
    82 
    83 * proof objects (in particular record all uses of oracles);
    84 
    85 * Simp_tac, Fast_tac, etc. that refer to implicit simpset / claset;
    86 
    87 * "constdefs" section in theory files;
    88 
    89 * "primrec" section (HOL) no longer requires names;
    90 
    91 * internal type "tactic" now simply "thm -> thm Sequence.seq";
    92 
    93 
    94 
    95 New in Isabelle94-5
    96 -------------------
    97 
    98 * reduced space requirements;
    99 
   100 * automatic HTML generation from theories;
   101 
   102 * theory files no longer require "..." (quotes) around most types;
   103 
   104 * new examples, including two proofs of the Church-Rosser theorem;
   105 
   106 * non-curried (1994) version of HOL is no longer distributed;
   107 
   108 
   109 $Id$