src/HOL/Refute.thy
author wenzelm
Mon Mar 16 18:24:30 2009 +0100 (2009-03-16)
changeset 30549 d2d7874648bd
parent 29820 07f53494cf20
child 32857 394d37f19e0a
permissions -rw-r--r--
simplified method setup;
     1 (*  Title:      HOL/Refute.thy
     2     ID:         $Id$
     3     Author:     Tjark Weber
     4     Copyright   2003-2007
     5 
     6 Basic setup and documentation for the 'refute' (and 'refute_params') command.
     7 *)
     8 
     9 header {* Refute *}
    10 
    11 theory Refute
    12 imports Hilbert_Choice List Record
    13 uses
    14   "Tools/prop_logic.ML"
    15   "Tools/sat_solver.ML"
    16   "Tools/refute.ML"
    17   "Tools/refute_isar.ML"
    18 begin
    19 
    20 setup Refute.setup
    21 
    22 text {*
    23 \small
    24 \begin{verbatim}
    25 (* ------------------------------------------------------------------------- *)
    26 (* REFUTE                                                                    *)
    27 (*                                                                           *)
    28 (* We use a SAT solver to search for a (finite) model that refutes a given   *)
    29 (* HOL formula.                                                              *)
    30 (* ------------------------------------------------------------------------- *)
    31 
    32 (* ------------------------------------------------------------------------- *)
    33 (* NOTE                                                                      *)
    34 (*                                                                           *)
    35 (* I strongly recommend that you install a stand-alone SAT solver if you     *)
    36 (* want to use 'refute'.  For details see 'HOL/Tools/sat_solver.ML'.  If you *)
    37 (* have installed (a supported version of) zChaff, simply set 'ZCHAFF_HOME'  *)
    38 (* in 'etc/settings'.                                                        *)
    39 (* ------------------------------------------------------------------------- *)
    40 
    41 (* ------------------------------------------------------------------------- *)
    42 (* USAGE                                                                     *)
    43 (*                                                                           *)
    44 (* See the file 'HOL/ex/Refute_Examples.thy' for examples.  The supported    *)
    45 (* parameters are explained below.                                           *)
    46 (* ------------------------------------------------------------------------- *)
    47 
    48 (* ------------------------------------------------------------------------- *)
    49 (* CURRENT LIMITATIONS                                                       *)
    50 (*                                                                           *)
    51 (* 'refute' currently accepts formulas of higher-order predicate logic (with *)
    52 (* equality), including free/bound/schematic variables, lambda abstractions, *)
    53 (* sets and set membership, "arbitrary", "The", "Eps", records and           *)
    54 (* inductively defined sets.  Constants are unfolded automatically, and sort *)
    55 (* axioms are added as well.  Other, user-asserted axioms however are        *)
    56 (* ignored.  Inductive datatypes and recursive functions are supported, but  *)
    57 (* may lead to spurious countermodels.                                       *)
    58 (*                                                                           *)
    59 (* The (space) complexity of the algorithm is non-elementary.                *)
    60 (*                                                                           *)
    61 (* Schematic type variables are not supported.                               *)
    62 (* ------------------------------------------------------------------------- *)
    63 
    64 (* ------------------------------------------------------------------------- *)
    65 (* PARAMETERS                                                                *)
    66 (*                                                                           *)
    67 (* The following global parameters are currently supported (and required):   *)
    68 (*                                                                           *)
    69 (* Name          Type    Description                                         *)
    70 (*                                                                           *)
    71 (* "minsize"     int     Only search for models with size at least           *)
    72 (*                       'minsize'.                                          *)
    73 (* "maxsize"     int     If >0, only search for models with size at most     *)
    74 (*                       'maxsize'.                                          *)
    75 (* "maxvars"     int     If >0, use at most 'maxvars' boolean variables      *)
    76 (*                       when transforming the term into a propositional     *)
    77 (*                       formula.                                            *)
    78 (* "maxtime"     int     If >0, terminate after at most 'maxtime' seconds.   *)
    79 (*                       This value is ignored under some ML compilers.      *)
    80 (* "satsolver"   string  Name of the SAT solver to be used.                  *)
    81 (*                                                                           *)
    82 (* See 'HOL/SAT.thy' for default values.                                     *)
    83 (*                                                                           *)
    84 (* The size of particular types can be specified in the form type=size       *)
    85 (* (where 'type' is a string, and 'size' is an int).  Examples:              *)
    86 (* "'a"=1                                                                    *)
    87 (* "List.list"=2                                                             *)
    88 (* ------------------------------------------------------------------------- *)
    89 
    90 (* ------------------------------------------------------------------------- *)
    91 (* FILES                                                                     *)
    92 (*                                                                           *)
    93 (* HOL/Tools/prop_logic.ML    Propositional logic                            *)
    94 (* HOL/Tools/sat_solver.ML    SAT solvers                                    *)
    95 (* HOL/Tools/refute.ML        Translation HOL -> propositional logic and     *)
    96 (*                            Boolean assignment -> HOL model                *)
    97 (* HOL/Tools/refute_isar.ML   Adds 'refute'/'refute_params' to Isabelle's    *)
    98 (*                            syntax                                         *)
    99 (* HOL/Refute.thy             This file: loads the ML files, basic setup,    *)
   100 (*                            documentation                                  *)
   101 (* HOL/SAT.thy                Sets default parameters                        *)
   102 (* HOL/ex/RefuteExamples.thy  Examples                                       *)
   103 (* ------------------------------------------------------------------------- *)
   104 \end{verbatim}
   105 *}
   106 
   107 end