src/HOL/Library/Refute.thy
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(*  Title:      HOL/Library/Refute.thy
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    Author:     Tjark Weber
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    Copyright   2003-2007
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Basic setup and documentation for the 'refute' (and 'refute_params') command.
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*)
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section \<open>Refute\<close>
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theory Refute
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imports Main
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keywords "refute" :: diag and "refute_params" :: thy_decl
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begin
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ML_file "refute.ML"
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refute_params
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 [itself = 1,
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  minsize = 1,
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  maxsize = 8,
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  maxvars = 10000,
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  maxtime = 60,
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  satsolver = auto,
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  no_assms = false]
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text \<open>
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\small
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\begin{verbatim}
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(* ------------------------------------------------------------------------- *)
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(* REFUTE                                                                    *)
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(*                                                                           *)
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(* We use a SAT solver to search for a (finite) model that refutes a given   *)
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(* HOL formula.                                                              *)
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(* ------------------------------------------------------------------------- *)
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(* ------------------------------------------------------------------------- *)
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(* NOTE                                                                      *)
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(*                                                                           *)
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(* I strongly recommend that you install a stand-alone SAT solver if you     *)
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(* want to use 'refute'.  For details see 'HOL/Tools/sat_solver.ML'.  If you *)
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(* have installed (a supported version of) zChaff, simply set 'ZCHAFF_HOME'  *)
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(* in 'etc/settings'.                                                        *)
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(* ------------------------------------------------------------------------- *)
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(* ------------------------------------------------------------------------- *)
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(* USAGE                                                                     *)
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(*                                                                           *)
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(* See the file 'HOL/ex/Refute_Examples.thy' for examples.  The supported    *)
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(* parameters are explained below.                                           *)
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(* ------------------------------------------------------------------------- *)
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(* ------------------------------------------------------------------------- *)
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(* CURRENT LIMITATIONS                                                       *)
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(*                                                                           *)
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(* 'refute' currently accepts formulas of higher-order predicate logic (with *)
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(* equality), including free/bound/schematic variables, lambda abstractions, *)
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(* sets and set membership, "arbitrary", "The", "Eps", records and           *)
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(* inductively defined sets.  Constants are unfolded automatically, and sort *)
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(* axioms are added as well.  Other, user-asserted axioms however are        *)
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(* ignored.  Inductive datatypes and recursive functions are supported, but  *)
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(* may lead to spurious countermodels.                                       *)
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(*                                                                           *)
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(* The (space) complexity of the algorithm is non-elementary.                *)
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(*                                                                           *)
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(* Schematic type variables are not supported.                               *)
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(* ------------------------------------------------------------------------- *)
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(* ------------------------------------------------------------------------- *)
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(* PARAMETERS                                                                *)
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(*                                                                           *)
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(* The following global parameters are currently supported (and required,    *)
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(* except for "expect"):                                                     *)
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(*                                                                           *)
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(* Name          Type    Description                                         *)
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(*                                                                           *)
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(* "minsize"     int     Only search for models with size at least           *)
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(*                       'minsize'.                                          *)
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(* "maxsize"     int     If >0, only search for models with size at most     *)
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(*                       'maxsize'.                                          *)
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(* "maxvars"     int     If >0, use at most 'maxvars' boolean variables      *)
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(*                       when transforming the term into a propositional     *)
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(*                       formula.                                            *)
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(* "maxtime"     int     If >0, terminate after at most 'maxtime' seconds.   *)
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(*                       This value is ignored under some ML compilers.      *)
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(* "satsolver"   string  Name of the SAT solver to be used.                  *)
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(* "no_assms"    bool    If "true", assumptions in structured proofs are     *)
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(*                       not considered.                                     *)
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(* "expect"      string  Expected result ("genuine", "potential", "none", or *)
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(*                       "unknown").                                         *)
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(*                                                                           *)
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(* The size of particular types can be specified in the form type=size       *)
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(* (where 'type' is a string, and 'size' is an int).  Examples:              *)
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(* "'a"=1                                                                    *)
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(* "List.list"=2                                                             *)
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(* ------------------------------------------------------------------------- *)
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(* ------------------------------------------------------------------------- *)
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(* FILES                                                                     *)
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(*                                                                           *)
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(* HOL/Tools/prop_logic.ML     Propositional logic                           *)
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(* HOL/Tools/sat_solver.ML     SAT solvers                                   *)
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(* HOL/Tools/refute.ML         Translation HOL -> propositional logic and    *)
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(*                             Boolean assignment -> HOL model               *)
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(* HOL/Refute.thy              This file: loads the ML files, basic setup,   *)
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(*                             documentation                                 *)
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(* HOL/SAT.thy                 Sets default parameters                       *)
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(* HOL/ex/Refute_Examples.thy  Examples                                      *)
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(* ------------------------------------------------------------------------- *)
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\end{verbatim}
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\<close>
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end