src/HOL/Tools/res_axioms.ML
author paulson
Fri Dec 03 17:03:05 2004 +0100 (2004-12-03)
changeset 15371 40f5045c5985
parent 15370 05b03ea0f18d
child 15390 87f78411f7c9
permissions -rw-r--r--
fixes to clause conversion
paulson@15347
     1
(*  Author: Jia Meng, Cambridge University Computer Laboratory
paulson@15347
     2
    ID: $Id$
paulson@15347
     3
    Copyright 2004 University of Cambridge
paulson@15347
     4
paulson@15347
     5
Transformation of axiom rules (elim/intro/etc) into CNF forms.    
paulson@15347
     6
*)
paulson@15347
     7
paulson@15347
     8
paulson@15347
     9
paulson@15347
    10
signature RES_ELIM_RULE =
paulson@15347
    11
sig
paulson@15347
    12
paulson@15347
    13
exception ELIMR2FOL of string
paulson@15347
    14
val elimRule_tac : Thm.thm -> Tactical.tactic
paulson@15347
    15
val elimR2Fol : Thm.thm -> Term.term
paulson@15347
    16
val transform_elim : Thm.thm -> Thm.thm
paulson@15347
    17
paulson@15347
    18
end;
paulson@15347
    19
paulson@15347
    20
structure ResElimRule: RES_ELIM_RULE =
paulson@15347
    21
paulson@15347
    22
struct
paulson@15347
    23
paulson@15347
    24
fun elimRule_tac thm =
paulson@15347
    25
    ((rtac impI 1) ORELSE (rtac notI 1)) THEN (etac thm 1) THEN
paulson@15371
    26
    REPEAT(Fast_tac 1);
paulson@15347
    27
paulson@15347
    28
paulson@15347
    29
(* This following version fails sometimes, need to investigate, do not use it now. *)
paulson@15347
    30
fun elimRule_tac' thm =
paulson@15347
    31
   ((rtac impI 1) ORELSE (rtac notI 1)) THEN (etac thm 1) THEN
paulson@15347
    32
   REPEAT(SOLVE((etac exI 1) ORELSE (rtac conjI 1) ORELSE (rtac disjI1 1) ORELSE (rtac disjI2 1))); 
paulson@15347
    33
paulson@15347
    34
paulson@15347
    35
exception ELIMR2FOL of string;
paulson@15347
    36
paulson@15347
    37
fun make_imp (prem,concl) = Const("op -->", Type("fun",[Type("bool",[]),Type("fun",[Type("bool",[]),Type("bool",[])])])) $ prem $ concl;
paulson@15347
    38
paulson@15347
    39
paulson@15347
    40
fun make_disjs [x] = x
paulson@15347
    41
  | make_disjs (x :: xs) = Const("op |",Type("fun",[Type("bool",[]),Type("fun",[Type("bool",[]),Type("bool",[])])])) $ x $ (make_disjs xs)
paulson@15347
    42
paulson@15347
    43
paulson@15347
    44
fun make_conjs [x] = x
paulson@15347
    45
  | make_conjs (x :: xs) = Const("op &", Type("fun",[Type("bool",[]),Type("fun",[Type("bool",[]),Type("bool",[])])])) $ x $ (make_conjs xs)
paulson@15347
    46
paulson@15347
    47
paulson@15347
    48
fun add_EX term [] = term
paulson@15347
    49
  | add_EX term ((x,xtp)::xs) = add_EX (Const ("Ex",Type("fun",[Type("fun",[xtp,Type("bool",[])]),Type("bool",[])])) $ Abs (x,xtp,term)) xs;
paulson@15347
    50
paulson@15347
    51
paulson@15347
    52
exception TRUEPROP of string; 
paulson@15347
    53
paulson@15347
    54
fun strip_trueprop (Const ("Trueprop", Type("fun",[Type("bool",[]),Type("prop",[])])) $ P) = P
paulson@15347
    55
  | strip_trueprop _ = raise TRUEPROP("not a prop!");
paulson@15347
    56
paulson@15347
    57
paulson@15371
    58
fun neg P = Const ("Not", Type("fun",[Type("bool",[]),Type("bool",[])])) $ P;
paulson@15371
    59
paulson@15371
    60
paulson@15371
    61
fun is_neg (Const("Trueprop",_) $ (Const("Not",_) $ Free(p,_))) (Const("Trueprop",_) $ Free(q,_))= (p = q)
paulson@15371
    62
  | is_neg _ _ = false;
paulson@15371
    63
paulson@15347
    64
paulson@15347
    65
exception STRIP_CONCL;
paulson@15347
    66
paulson@15347
    67
paulson@15371
    68
fun strip_concl' prems bvs (Const ("==>",_) $ P $ Q) =
paulson@15347
    69
    let val P' = strip_trueprop P
paulson@15347
    70
	val prems' = P'::prems
paulson@15347
    71
    in
paulson@15371
    72
	strip_concl' prems' bvs  Q
paulson@15347
    73
    end
paulson@15371
    74
  | strip_concl' prems bvs P = 
paulson@15371
    75
    let val P' = neg (strip_trueprop P)
paulson@15371
    76
    in
paulson@15371
    77
	add_EX (make_conjs (P'::prems)) bvs
paulson@15371
    78
    end;
paulson@15371
    79
paulson@15371
    80
paulson@15371
    81
fun strip_concl prems bvs concl (Const ("all", _) $ Abs (x,xtp,body))  = strip_concl prems ((x,xtp)::bvs) concl body
paulson@15371
    82
  | strip_concl prems bvs concl (Const ("==>",_) $ P $ Q) =
paulson@15371
    83
    if (is_neg P concl) then (strip_concl' prems bvs Q)
paulson@15371
    84
    else
paulson@15371
    85
	(let val P' = strip_trueprop P
paulson@15371
    86
	     val prems' = P'::prems
paulson@15371
    87
	 in
paulson@15371
    88
	     strip_concl prems' bvs  concl Q
paulson@15371
    89
	 end)
paulson@15371
    90
  | strip_concl prems bvs concl _ = add_EX (make_conjs prems) bvs;
paulson@15347
    91
 
paulson@15347
    92
paulson@15347
    93
paulson@15371
    94
fun trans_elim (main,others,concl) =
paulson@15371
    95
    let val others' = map (strip_concl [] [] concl) others
paulson@15347
    96
	val disjs = make_disjs others'
paulson@15347
    97
    in
paulson@15347
    98
	make_imp(strip_trueprop main,disjs)
paulson@15347
    99
    end;
paulson@15347
   100
paulson@15347
   101
paulson@15371
   102
fun elimR2Fol_aux prems concl = 
paulson@15347
   103
    let val nprems = length prems
paulson@15347
   104
	val main = hd prems
paulson@15347
   105
    in
paulson@15347
   106
	if (nprems = 1) then neg (strip_trueprop main)
paulson@15371
   107
        else trans_elim (main, tl prems, concl)
paulson@15347
   108
    end;
paulson@15347
   109
paulson@15347
   110
paulson@15347
   111
fun trueprop term = Const ("Trueprop", Type("fun",[Type("bool",[]),Type("prop",[])])) $ term; 
paulson@15347
   112
	    
paulson@15347
   113
paulson@15347
   114
fun elimR2Fol elimR = 
paulson@15347
   115
    let val elimR' = Drule.freeze_all elimR
paulson@15347
   116
	val (prems,concl) = (prems_of elimR', concl_of elimR')
paulson@15347
   117
    in
paulson@15347
   118
	case concl of Const("Trueprop",_) $ Free(_,Type("bool",[])) 
paulson@15371
   119
		      => trueprop (elimR2Fol_aux prems concl)
paulson@15371
   120
                    | Free(x,Type("prop",[])) => trueprop(elimR2Fol_aux prems concl) 
paulson@15347
   121
		    | _ => raise ELIMR2FOL("Not an elimination rule!")
paulson@15347
   122
    end;
paulson@15347
   123
paulson@15347
   124
paulson@15347
   125
paulson@15347
   126
(**** use prove_goalw_cterm to prove ****)
paulson@15347
   127
paulson@15347
   128
fun transform_elim thm =
paulson@15347
   129
    let val tm = elimR2Fol thm
paulson@15347
   130
	val ctm = cterm_of (sign_of_thm thm) tm	
paulson@15347
   131
    in
paulson@15347
   132
	prove_goalw_cterm [] ctm (fn prems => [elimRule_tac thm])
paulson@15347
   133
    end;	
paulson@15347
   134
paulson@15347
   135
paulson@15347
   136
end;
paulson@15347
   137
paulson@15347
   138
paulson@15347
   139
(* some lemmas *)
paulson@15347
   140
paulson@15347
   141
Goal "(P==True) ==> P";
paulson@15347
   142
by(Blast_tac 1);
paulson@15347
   143
qed "Eq_TrueD1";
paulson@15347
   144
paulson@15347
   145
Goal "(P=True) ==> P";
paulson@15347
   146
by(Blast_tac 1);
paulson@15347
   147
qed "Eq_TrueD2";
paulson@15347
   148
paulson@15347
   149
Goal "(P==False) ==> ~P";
paulson@15347
   150
by(Blast_tac 1);
paulson@15347
   151
qed "Eq_FalseD1";
paulson@15347
   152
paulson@15347
   153
Goal "(P=False) ==> ~P";
paulson@15347
   154
by(Blast_tac 1);
paulson@15347
   155
qed "Eq_FalseD2";
paulson@15347
   156
paulson@15359
   157
local 
paulson@15347
   158
paulson@15359
   159
    fun prove s = prove_goal (the_context()) s (fn _ => [Simp_tac 1]);
paulson@15347
   160
paulson@15359
   161
val small_simps = 
paulson@15359
   162
  map prove 
paulson@15359
   163
   ["(P | True) == True", "(True | P) == True",
paulson@15359
   164
    "(P & True) == P", "(True & P) == P",
paulson@15359
   165
    "(False | P) == P", "(P | False) == P",
paulson@15359
   166
    "(False & P) == False", "(P & False) == False",
paulson@15359
   167
    "~True == False", "~False == True"];
paulson@15359
   168
in
paulson@15347
   169
paulson@15359
   170
val small_simpset = empty_ss addsimps small_simps
paulson@15347
   171
paulson@15359
   172
end;
paulson@15347
   173
paulson@15347
   174
paulson@15347
   175
signature RES_AXIOMS =
paulson@15347
   176
sig
paulson@15347
   177
paulson@15347
   178
val clausify_axiom : Thm.thm -> ResClause.clause list
paulson@15347
   179
val cnf_axiom : Thm.thm -> Thm.thm list
paulson@15347
   180
val cnf_elim : Thm.thm -> Thm.thm list
paulson@15347
   181
val cnf_intro : Thm.thm -> Thm.thm list
paulson@15347
   182
val cnf_rule : Thm.thm -> Thm.thm list
paulson@15347
   183
val cnf_classical_rules_thy : Theory.theory -> Thm.thm list list * Thm.thm list
paulson@15347
   184
val clausify_classical_rules_thy 
paulson@15347
   185
: Theory.theory -> ResClause.clause list list * Thm.thm list
paulson@15347
   186
val cnf_simpset_rules_thy 
paulson@15347
   187
: Theory.theory -> Thm.thm list list * Thm.thm list
paulson@15347
   188
val clausify_simpset_rules_thy 
paulson@15347
   189
: Theory.theory -> ResClause.clause list list * Thm.thm list
paulson@15347
   190
val rm_Eps 
paulson@15347
   191
: (Term.term * Term.term) list -> Thm.thm list -> Term.term list
paulson@15347
   192
end;
paulson@15347
   193
paulson@15347
   194
structure ResAxioms : RES_AXIOMS =
paulson@15347
   195
 
paulson@15347
   196
struct
paulson@15347
   197
paulson@15347
   198
open ResElimRule;
paulson@15347
   199
paulson@15347
   200
(* to be fixed: cnf_intro, cnf_rule, is_introR *)
paulson@15347
   201
paulson@15347
   202
fun is_elimR thm = 
paulson@15347
   203
    case (concl_of thm) of (Const ("Trueprop", _) $ Var (idx,_)) => true
paulson@15347
   204
			 | Var(indx,Type("prop",[])) => true
paulson@15347
   205
			 | _ => false;
paulson@15347
   206
paulson@15347
   207
paulson@15347
   208
paulson@15347
   209
fun repeat_RS thm1 thm2 =
paulson@15347
   210
    let val thm1' =  thm1 RS thm2 handle THM _ => thm1
paulson@15347
   211
    in
paulson@15347
   212
	if eq_thm(thm1,thm1') then thm1' else (repeat_RS thm1' thm2)
paulson@15347
   213
    end;
paulson@15347
   214
paulson@15347
   215
paulson@15347
   216
paulson@15347
   217
(* added this function to remove True/False in a theorem that is in NNF form. *)
paulson@15347
   218
fun rm_TF_nnf thm = simplify small_simpset thm;
paulson@15347
   219
paulson@15347
   220
fun skolem_axiom thm = 
paulson@15347
   221
    let val thm' = (skolemize o rm_TF_nnf o  make_nnf o ObjectLogic.atomize_thm o Drule.freeze_all) thm
paulson@15347
   222
    in 
paulson@15347
   223
	repeat_RS thm' someI_ex
paulson@15347
   224
    end;
paulson@15347
   225
paulson@15347
   226
paulson@15347
   227
fun isa_cls thm = 
paulson@15347
   228
    let val thm' = skolem_axiom thm 
paulson@15347
   229
    in
paulson@15347
   230
	map standard (make_clauses [thm'])
paulson@15347
   231
    end;
paulson@15347
   232
paulson@15347
   233
paulson@15347
   234
fun cnf_elim thm = 
paulson@15347
   235
    let val thm' = transform_elim thm;
paulson@15347
   236
    in
paulson@15347
   237
	isa_cls thm'
paulson@15347
   238
    end;
paulson@15347
   239
paulson@15347
   240
paulson@15347
   241
val cnf_intro = isa_cls;
paulson@15347
   242
val cnf_rule = isa_cls;	
paulson@15347
   243
paulson@15347
   244
paulson@15347
   245
fun is_introR thm = true;
paulson@15347
   246
paulson@15347
   247
paulson@15347
   248
paulson@15370
   249
(*Transfer a theorem in to theory Reconstruction.thy if it is not already
paulson@15359
   250
  inside that theory -- because it's needed for Skolemization *)
paulson@15359
   251
paulson@15370
   252
val recon_thy = ThyInfo.get_theory"Reconstruction";
paulson@15359
   253
paulson@15370
   254
fun transfer_to_Reconstruction thm =
paulson@15370
   255
    transfer recon_thy thm handle THM _ => thm;
paulson@15347
   256
paulson@15347
   257
(* remove "True" clause *)
paulson@15347
   258
fun rm_redundant_cls [] = []
paulson@15347
   259
  | rm_redundant_cls (thm::thms) =
paulson@15347
   260
    let val t = prop_of thm
paulson@15347
   261
    in
paulson@15347
   262
	case t of (Const ("Trueprop", _) $ Const ("True", _)) => rm_redundant_cls thms
paulson@15347
   263
		| _ => thm::(rm_redundant_cls thms)
paulson@15347
   264
    end;
paulson@15347
   265
paulson@15347
   266
(* transform an Isabelle thm into CNF *)
paulson@15347
   267
fun cnf_axiom thm =
paulson@15370
   268
    let val thm' = transfer_to_Reconstruction thm
paulson@15347
   269
	val thm'' = if (is_elimR thm') then (cnf_elim thm')
paulson@15347
   270
		    else (if (is_introR thm') then cnf_intro thm' else cnf_rule thm')
paulson@15347
   271
    in
paulson@15347
   272
	rm_redundant_cls thm''
paulson@15347
   273
    end;
paulson@15347
   274
paulson@15347
   275
paulson@15347
   276
(* changed: with one extra case added *)
paulson@15347
   277
fun univ_vars_of_aux (Const ("Hilbert_Choice.Eps",_) $ Abs(_,_,body)) vars = univ_vars_of_aux body vars
paulson@15347
   278
  | univ_vars_of_aux (Const ("Ex",_) $ Abs(_,_,body)) vars = univ_vars_of_aux body vars (* EX x. body *)
paulson@15347
   279
  | univ_vars_of_aux (P $ Q) vars =
paulson@15347
   280
    let val vars' = univ_vars_of_aux P vars
paulson@15347
   281
    in
paulson@15347
   282
	univ_vars_of_aux Q vars'
paulson@15347
   283
    end
paulson@15347
   284
  | univ_vars_of_aux (t as Var(_,_)) vars = 
paulson@15347
   285
    if (t mem vars) then vars else (t::vars)
paulson@15347
   286
  | univ_vars_of_aux _ vars = vars;
paulson@15347
   287
  
paulson@15347
   288
paulson@15347
   289
fun univ_vars_of t = univ_vars_of_aux t [];
paulson@15347
   290
paulson@15347
   291
paulson@15347
   292
fun get_new_skolem epss (t as (Const ("Hilbert_Choice.Eps",_) $ Abs(_,tp,_)))  = 
paulson@15347
   293
    let val all_vars = univ_vars_of t
paulson@15347
   294
	val sk_term = ResSkolemFunction.gen_skolem all_vars tp
paulson@15347
   295
    in
paulson@15347
   296
	(sk_term,(t,sk_term)::epss)
paulson@15347
   297
    end;
paulson@15347
   298
paulson@15347
   299
paulson@15347
   300
fun sk_lookup [] t = None
paulson@15347
   301
  | sk_lookup ((tm,sk_tm)::tms) t = if (t = tm) then Some (sk_tm) else (sk_lookup tms t);
paulson@15347
   302
paulson@15347
   303
paulson@15347
   304
fun get_skolem epss t = 
paulson@15347
   305
    let val sk_fun = sk_lookup epss t
paulson@15347
   306
    in
paulson@15347
   307
	case sk_fun of None => get_new_skolem epss t
paulson@15347
   308
		     | Some sk => (sk,epss)
paulson@15347
   309
    end;
paulson@15347
   310
paulson@15347
   311
paulson@15347
   312
fun rm_Eps_cls_aux epss (t as (Const ("Hilbert_Choice.Eps",_) $ Abs(_,_,_))) = get_skolem epss t
paulson@15347
   313
  | rm_Eps_cls_aux epss (P $ Q) =
paulson@15347
   314
    let val (P',epss') = rm_Eps_cls_aux epss P
paulson@15347
   315
	val (Q',epss'') = rm_Eps_cls_aux epss' Q
paulson@15347
   316
    in
paulson@15347
   317
	(P' $ Q',epss'')
paulson@15347
   318
    end
paulson@15347
   319
  | rm_Eps_cls_aux epss t = (t,epss);
paulson@15347
   320
paulson@15347
   321
paulson@15347
   322
fun rm_Eps_cls epss thm =
paulson@15347
   323
    let val tm = prop_of thm
paulson@15347
   324
    in
paulson@15347
   325
	rm_Eps_cls_aux epss tm
paulson@15347
   326
    end;
paulson@15347
   327
paulson@15347
   328
paulson@15347
   329
paulson@15347
   330
fun rm_Eps _ [] = []
paulson@15347
   331
  | rm_Eps epss (thm::thms) = 
paulson@15347
   332
    let val (thm',epss') = rm_Eps_cls epss thm
paulson@15347
   333
    in
paulson@15347
   334
	thm' :: (rm_Eps epss' thms)
paulson@15347
   335
    end;
paulson@15347
   336
paulson@15347
   337
paulson@15347
   338
paulson@15347
   339
(* changed, now it also finds out the name of the theorem. *)
paulson@15347
   340
fun clausify_axiom thm =
paulson@15347
   341
    let val isa_clauses = cnf_axiom thm (*"isa_clauses" are already "standard"ed. *)
paulson@15347
   342
        val isa_clauses' = rm_Eps [] isa_clauses
paulson@15347
   343
        val thm_name = Thm.name_of_thm thm
paulson@15347
   344
	val clauses_n = length isa_clauses
paulson@15347
   345
	fun make_axiom_clauses _ [] = []
paulson@15347
   346
	  | make_axiom_clauses i (cls::clss) = (ResClause.make_axiom_clause cls (thm_name,i)) :: make_axiom_clauses (i+1) clss 
paulson@15347
   347
    in
paulson@15347
   348
	make_axiom_clauses 0 isa_clauses'
paulson@15347
   349
		
paulson@15347
   350
    end;
paulson@15347
   351
  
paulson@15347
   352
paulson@15347
   353
(******** Extracting and CNF/Clausify theorems from a classical reasoner and simpset of a given theory ******)
paulson@15347
   354
paulson@15347
   355
paulson@15347
   356
local
paulson@15347
   357
paulson@15347
   358
fun retr_thms ([]:MetaSimplifier.rrule list) = []
paulson@15347
   359
	  | retr_thms (r::rs) = (#thm r)::(retr_thms rs);
paulson@15347
   360
paulson@15347
   361
paulson@15347
   362
fun snds [] = []
paulson@15347
   363
  |   snds ((x,y)::l) = y::(snds l);
paulson@15347
   364
paulson@15347
   365
in
paulson@15347
   366
paulson@15347
   367
paulson@15347
   368
fun claset_rules_of_thy thy =
paulson@15347
   369
    let val clsset = rep_cs (claset_of thy)
paulson@15347
   370
	val safeEs = #safeEs clsset
paulson@15347
   371
	val safeIs = #safeIs clsset
paulson@15347
   372
	val hazEs = #hazEs clsset
paulson@15347
   373
	val hazIs = #hazIs clsset
paulson@15347
   374
    in
paulson@15347
   375
	safeEs @ safeIs @ hazEs @ hazIs
paulson@15347
   376
    end;
paulson@15347
   377
paulson@15347
   378
fun simpset_rules_of_thy thy =
paulson@15347
   379
    let val simpset = simpset_of thy
paulson@15347
   380
	val rules = #rules(fst (rep_ss simpset))
paulson@15347
   381
	val thms = retr_thms (snds(Net.dest rules))
paulson@15347
   382
    in
paulson@15347
   383
	thms
paulson@15347
   384
    end;
paulson@15347
   385
paulson@15347
   386
end;
paulson@15347
   387
paulson@15347
   388
paulson@15347
   389
(**** Translate a set of classical rules or simplifier rules into CNF (still as type "thm") from a given theory ****)
paulson@15347
   390
paulson@15347
   391
(* classical rules *)
paulson@15347
   392
fun cnf_classical_rules [] err_list = ([],err_list)
paulson@15347
   393
  | cnf_classical_rules (thm::thms) err_list = 
paulson@15347
   394
    let val (ts,es) = cnf_classical_rules thms err_list
paulson@15347
   395
    in
paulson@15347
   396
	((cnf_axiom thm)::ts,es) handle  _ => (ts,(thm::es))
paulson@15347
   397
    end;
paulson@15347
   398
paulson@15347
   399
paulson@15347
   400
(* CNF all rules from a given theory's classical reasoner *)
paulson@15347
   401
fun cnf_classical_rules_thy thy = 
paulson@15347
   402
    let val rules = claset_rules_of_thy thy
paulson@15347
   403
    in
paulson@15347
   404
        cnf_classical_rules rules []
paulson@15347
   405
    end;
paulson@15347
   406
paulson@15347
   407
paulson@15347
   408
(* simplifier rules *)
paulson@15347
   409
fun cnf_simpset_rules [] err_list = ([],err_list)
paulson@15347
   410
  | cnf_simpset_rules (thm::thms) err_list =
paulson@15347
   411
    let val (ts,es) = cnf_simpset_rules thms err_list
paulson@15347
   412
    in
paulson@15347
   413
	((cnf_axiom thm)::ts,es) handle _ => (ts,(thm::es))
paulson@15347
   414
    end;
paulson@15347
   415
paulson@15347
   416
paulson@15347
   417
(* CNF all simplifier rules from a given theory's simpset *)
paulson@15347
   418
fun cnf_simpset_rules_thy thy =
paulson@15347
   419
    let val thms = simpset_rules_of_thy thy
paulson@15347
   420
    in
paulson@15347
   421
	cnf_simpset_rules thms []
paulson@15347
   422
    end;
paulson@15347
   423
paulson@15347
   424
paulson@15347
   425
paulson@15347
   426
(**** Convert all theorems of a classical reason/simpset into clauses (ResClause.clause) ****)
paulson@15347
   427
paulson@15347
   428
(* classical rules *)
paulson@15347
   429
fun clausify_classical_rules [] err_list = ([],err_list)
paulson@15347
   430
  | clausify_classical_rules (thm::thms) err_list =
paulson@15347
   431
    let val (ts,es) = clausify_classical_rules thms err_list
paulson@15347
   432
    in
paulson@15347
   433
	((clausify_axiom thm)::ts,es) handle  _ => (ts,(thm::es))
paulson@15347
   434
    end;
paulson@15347
   435
paulson@15347
   436
fun clausify_classical_rules_thy thy =
paulson@15347
   437
    let val rules = claset_rules_of_thy thy
paulson@15347
   438
    in
paulson@15347
   439
	clausify_classical_rules rules []
paulson@15347
   440
    end;
paulson@15347
   441
paulson@15347
   442
paulson@15347
   443
(* simplifier rules *)
paulson@15347
   444
fun clausify_simpset_rules [] err_list = ([],err_list)
paulson@15347
   445
  | clausify_simpset_rules (thm::thms) err_list =
paulson@15347
   446
    let val (ts,es) = clausify_simpset_rules thms err_list
paulson@15347
   447
    in
paulson@15347
   448
	((clausify_axiom thm)::ts,es) handle _ => (ts,(thm::es))
paulson@15347
   449
    end;
paulson@15347
   450
paulson@15347
   451
paulson@15347
   452
fun clausify_simpset_rules_thy thy =
paulson@15347
   453
    let val thms = simpset_rules_of_thy thy
paulson@15347
   454
    in
paulson@15347
   455
	clausify_simpset_rules thms []
paulson@15347
   456
    end;
paulson@15347
   457
paulson@15347
   458
paulson@15347
   459
paulson@15347
   460
paulson@15347
   461
end;