author  paulson 
Fri, 18 Feb 2000 15:35:29 +0100  
changeset 8255  38f96394c099 
parent 7570  a9391550eea1 
child 8472  50a653f8b8ea 
permissions  rwrr 
1459  1 
(* Title: FOL/simpdata 
0  2 
ID: $Id$ 
1459  3 
Author: Lawrence C Paulson, Cambridge University Computer Laboratory 
282  4 
Copyright 1994 University of Cambridge 
0  5 

6 
Simplification data for FOL 

7 
*) 

8 

5496  9 
(* Elimination of True from asumptions: *) 
10 

11 
val True_implies_equals = prove_goal IFOL.thy 

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"(True ==> PROP P) == PROP P" 

13 
(K [rtac equal_intr_rule 1, atac 2, 

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METAHYPS (fn prems => resolve_tac prems 1) 1, 

15 
rtac TrueI 1]); 

16 

17 

0  18 
(*** Rewrite rules ***) 
19 

20 
fun int_prove_fun s = 

282  21 
(writeln s; 
22 
prove_goal IFOL.thy s 

23 
(fn prems => [ (cut_facts_tac prems 1), 

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(IntPr.fast_tac 1) ])); 
0  25 

1953  26 
val conj_simps = map int_prove_fun 
1459  27 
["P & True <> P", "True & P <> P", 
0  28 
"P & False <> False", "False & P <> False", 
2801  29 
"P & P <> P", "P & P & Q <> P & Q", 
1459  30 
"P & ~P <> False", "~P & P <> False", 
0  31 
"(P & Q) & R <> P & (Q & R)"]; 
32 

1953  33 
val disj_simps = map int_prove_fun 
1459  34 
["P  True <> True", "True  P <> True", 
35 
"P  False <> P", "False  P <> P", 

2801  36 
"P  P <> P", "P  P  Q <> P  Q", 
0  37 
"(P  Q)  R <> P  (Q  R)"]; 
38 

1953  39 
val not_simps = map int_prove_fun 
282  40 
["~(PQ) <> ~P & ~Q", 
1459  41 
"~ False <> True", "~ True <> False"]; 
0  42 

1953  43 
val imp_simps = map int_prove_fun 
1459  44 
["(P > False) <> ~P", "(P > True) <> True", 
45 
"(False > P) <> True", "(True > P) <> P", 

46 
"(P > P) <> True", "(P > ~P) <> ~P"]; 

0  47 

1953  48 
val iff_simps = map int_prove_fun 
1459  49 
["(True <> P) <> P", "(P <> True) <> P", 
0  50 
"(P <> P) <> True", 
1459  51 
"(False <> P) <> ~P", "(P <> False) <> ~P"]; 
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(*The x=t versions are needed for the simplification procedures*) 
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val quant_simps = map int_prove_fun 
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["(ALL x. P) <> P", 
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"(ALL x. x=t > P(x)) <> P(t)", 
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"(ALL x. t=x > P(x)) <> P(t)", 
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"(EX x. P) <> P", 
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"(EX x. x=t & P(x)) <> P(t)", 
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"(EX x. t=x & P(x)) <> P(t)"]; 
0  61 

62 
(*These are NOT supplied by default!*) 

1953  63 
val distrib_simps = map int_prove_fun 
282  64 
["P & (Q  R) <> P&Q  P&R", 
65 
"(Q  R) & P <> Q&P  R&P", 

0  66 
"(P  Q > R) <> (P > R) & (Q > R)"]; 
67 

282  68 
(** Conversion into rewrite rules **) 
0  69 

53  70 
fun gen_all th = forall_elim_vars (#maxidx(rep_thm th)+1) th; 
71 

282  72 
val P_iff_F = int_prove_fun "~P ==> (P <> False)"; 
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val iff_reflection_F = P_iff_F RS iff_reflection; 

74 

75 
val P_iff_T = int_prove_fun "P ==> (P <> True)"; 

76 
val iff_reflection_T = P_iff_T RS iff_reflection; 

77 

78 
(*Make metaequalities. The operator below is Trueprop*) 

5555  79 

282  80 
fun mk_meta_eq th = case concl_of th of 
5555  81 
_ $ (Const("op =",_)$_$_) => th RS eq_reflection 
82 
 _ $ (Const("op <>",_)$_$_) => th RS iff_reflection 

83 
 _ => 

84 
error("conclusion must be a =equality or <>");; 

85 

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fun mk_eq th = case concl_of th of 

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Const("==",_)$_$_ => th 
5555  88 
 _ $ (Const("op =",_)$_$_) => mk_meta_eq th 
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 _ $ (Const("op <>",_)$_$_) => mk_meta_eq th 

282  90 
 _ $ (Const("Not",_)$_) => th RS iff_reflection_F 
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 _ => th RS iff_reflection_T; 

0  92 

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(*Replace premises x=y, X<>Y by X==Y*) 
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val mk_meta_prems = 
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rule_by_tactic 
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(REPEAT_FIRST (resolve_tac [meta_eq_to_obj_eq, def_imp_iff])); 
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fun mk_meta_cong rl = 
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standard(mk_meta_eq (mk_meta_prems rl)) 
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handle THM _ => 
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error("Premises and conclusion of congruence rules must use =equality or <>"); 
5555  102 

5304  103 
val mksimps_pairs = 
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[("op >", [mp]), ("op &", [conjunct1,conjunct2]), 

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("All", [spec]), ("True", []), ("False", [])]; 

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5555  107 
(* ###FIXME: move to Provers/simplifier.ML 
5304  108 
val mk_atomize: (string * thm list) list > thm > thm list 
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*) 

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(* ###FIXME: move to Provers/simplifier.ML *) 
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fun mk_atomize pairs = 
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let fun atoms th = 

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(case concl_of th of 

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Const("Trueprop",_) $ p => 

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(case head_of p of 

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Const(a,_) => 

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(case assoc(pairs,a) of 

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Some(rls) => flat (map atoms ([th] RL rls)) 

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 None => [th]) 

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 _ => [th]) 

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 _ => [th]) 

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in atoms end; 

123 

5555  124 
fun mksimps pairs = (map mk_eq o mk_atomize pairs o gen_all); 
981  125 

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(*** Classical laws ***) 
282  127 

0  128 
fun prove_fun s = 
282  129 
(writeln s; 
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prove_goal (the_context ()) s 
282  131 
(fn prems => [ (cut_facts_tac prems 1), 
1459  132 
(Cla.fast_tac FOL_cs 1) ])); 
745  133 

1953  134 
(*Avoids duplication of subgoals after expand_if, when the true and false 
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cases boil down to the same thing.*) 

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val cases_simp = prove_fun "(P > Q) & (~P > Q) <> Q"; 

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(*** Miniscoping: pushing quantifiers in 
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We do NOT distribute of ALL over &, or dually that of EX over  
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Baaz and Leitsch, On Skolemization and Proof Complexity (1994) 
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show that this step can increase proof length! 
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***) 
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(*existential miniscoping*) 
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val int_ex_simps = map int_prove_fun 
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["(EX x. P(x) & Q) <> (EX x. P(x)) & Q", 
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"(EX x. P & Q(x)) <> P & (EX x. Q(x))", 
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"(EX x. P(x)  Q) <> (EX x. P(x))  Q", 
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"(EX x. P  Q(x)) <> P  (EX x. Q(x))"]; 
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(*classical rules*) 
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val cla_ex_simps = map prove_fun 
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["(EX x. P(x) > Q) <> (ALL x. P(x)) > Q", 
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"(EX x. P > Q(x)) <> P > (EX x. Q(x))"]; 
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val ex_simps = int_ex_simps @ cla_ex_simps; 
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(*universal miniscoping*) 
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val int_all_simps = map int_prove_fun 
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["(ALL x. P(x) & Q) <> (ALL x. P(x)) & Q", 
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"(ALL x. P & Q(x)) <> P & (ALL x. Q(x))", 
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"(ALL x. P(x) > Q) <> (EX x. P(x)) > Q", 
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"(ALL x. P > Q(x)) <> P > (ALL x. Q(x))"]; 
1953  165 

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(*classical rules*) 
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val cla_all_simps = map prove_fun 
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["(ALL x. P(x)  Q) <> (ALL x. P(x))  Q", 
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"(ALL x. P  Q(x)) <> P  (ALL x. Q(x))"]; 
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val all_simps = int_all_simps @ cla_all_simps; 
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(*** Named rewrite rules proved for IFOL ***) 
1953  175 

1914  176 
fun int_prove nm thm = qed_goal nm IFOL.thy thm 
177 
(fn prems => [ (cut_facts_tac prems 1), 

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(IntPr.fast_tac 1) ]); 
1914  179 

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fun prove nm thm = qed_goal nm (the_context ()) thm (fn _ => [Blast_tac 1]); 
1914  181 

182 
int_prove "conj_commute" "P&Q <> Q&P"; 

183 
int_prove "conj_left_commute" "P&(Q&R) <> Q&(P&R)"; 

184 
val conj_comms = [conj_commute, conj_left_commute]; 

185 

186 
int_prove "disj_commute" "PQ <> QP"; 

187 
int_prove "disj_left_commute" "P(QR) <> Q(PR)"; 

188 
val disj_comms = [disj_commute, disj_left_commute]; 

189 

190 
int_prove "conj_disj_distribL" "P&(QR) <> (P&Q  P&R)"; 

191 
int_prove "conj_disj_distribR" "(PQ)&R <> (P&R  Q&R)"; 

192 

193 
int_prove "disj_conj_distribL" "P(Q&R) <> (PQ) & (PR)"; 

194 
int_prove "disj_conj_distribR" "(P&Q)R <> (PR) & (QR)"; 

195 

196 
int_prove "imp_conj_distrib" "(P > (Q&R)) <> (P>Q) & (P>R)"; 

197 
int_prove "imp_conj" "((P&Q)>R) <> (P > (Q > R))"; 

198 
int_prove "imp_disj" "(PQ > R) <> (P>R) & (Q>R)"; 

199 

3910  200 
prove "imp_disj1" "(P>Q)  R <> (P>Q  R)"; 
201 
prove "imp_disj2" "Q  (P>R) <> (P>Q  R)"; 

202 

1914  203 
int_prove "de_Morgan_disj" "(~(P  Q)) <> (~P & ~Q)"; 
204 
prove "de_Morgan_conj" "(~(P & Q)) <> (~P  ~Q)"; 

205 

206 
prove "not_iff" "~(P <> Q) <> (P <> ~Q)"; 

207 

3835  208 
prove "not_all" "(~ (ALL x. P(x))) <> (EX x.~P(x))"; 
209 
prove "imp_all" "((ALL x. P(x)) > Q) <> (EX x. P(x) > Q)"; 

210 
int_prove "not_ex" "(~ (EX x. P(x))) <> (ALL x.~P(x))"; 

1914  211 
int_prove "imp_ex" "((EX x. P(x)) > Q) <> (ALL x. P(x) > Q)"; 
212 

213 
int_prove "ex_disj_distrib" 

214 
"(EX x. P(x)  Q(x)) <> ((EX x. P(x))  (EX x. Q(x)))"; 

215 
int_prove "all_conj_distrib" 

216 
"(ALL x. P(x) & Q(x)) <> ((ALL x. P(x)) & (ALL x. Q(x)))"; 

217 

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(** make simplification procedures for quantifier elimination **) 
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structure Quantifier1 = Quantifier1Fun( 
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struct 
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(*abstract syntax*) 
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fun dest_eq((c as Const("op =",_)) $ s $ t) = Some(c,s,t) 
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 dest_eq _ = None; 
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fun dest_conj((c as Const("op &",_)) $ s $ t) = Some(c,s,t) 
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 dest_conj _ = None; 
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val conj = FOLogic.conj 
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val imp = FOLogic.imp 
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(*rules*) 
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val iff_reflection = iff_reflection 
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val iffI = iffI 
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val sym = sym 
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val conjI= conjI 
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val conjE= conjE 
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val impI = impI 
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val impE = impE 
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val mp = mp 
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val exI = exI 
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val exE = exE 
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val allI = allI 
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val allE = allE 
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end); 
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local 
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val ex_pattern = 
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read_cterm (Theory.sign_of (the_context ())) ("EX x. P(x) & Q(x)", FOLogic.oT) 
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val all_pattern = 
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read_cterm (Theory.sign_of (the_context ())) ("ALL x. P(x) & P'(x) > Q(x)", FOLogic.oT) 
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in 
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val defEX_regroup = 
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mk_simproc "defined EX" [ex_pattern] Quantifier1.rearrange_ex; 
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val defALL_regroup = 
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mk_simproc "defined ALL" [all_pattern] Quantifier1.rearrange_all; 
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end; 
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(*** Case splitting ***) 
0  261 

5304  262 
val meta_eq_to_iff = prove_goal IFOL.thy "x==y ==> x<>y" 
263 
(fn [prem] => [rewtac prem, rtac iffI 1, atac 1, atac 1]); 

1722  264 

5304  265 
structure SplitterData = 
266 
struct 

267 
structure Simplifier = Simplifier 

5555  268 
val mk_eq = mk_eq 
5304  269 
val meta_eq_to_iff = meta_eq_to_iff 
270 
val iffD = iffD2 

271 
val disjE = disjE 

272 
val conjE = conjE 

273 
val exE = exE 

274 
val contrapos = contrapos 

275 
val contrapos2 = contrapos2 

276 
val notnotD = notnotD 

277 
end; 

1722  278 

5304  279 
structure Splitter = SplitterFun(SplitterData); 
1722  280 

5304  281 
val split_tac = Splitter.split_tac; 
282 
val split_inside_tac = Splitter.split_inside_tac; 

283 
val split_asm_tac = Splitter.split_asm_tac; 

5307  284 
val op addsplits = Splitter.addsplits; 
285 
val op delsplits = Splitter.delsplits; 

5304  286 
val Addsplits = Splitter.Addsplits; 
287 
val Delsplits = Splitter.Delsplits; 

4325  288 

289 

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(*** Standard simpsets ***) 
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structure Induction = InductionFun(struct val spec=IFOL.spec end); 
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open Induction; 
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5555  296 

297 
(* Add congruence rules for = or <> (instead of ==) *) 

298 

299 
(* ###FIXME: Move to simplifier, 

300 
taking mk_meta_cong as input, eliminating addeqcongs and deleqcongs *) 

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infix 4 addcongs delcongs; 
5555  302 
fun ss addcongs congs = ss addeqcongs (map mk_meta_cong congs); 
303 
fun ss delcongs congs = ss deleqcongs (map mk_meta_cong congs); 

4094  304 
fun Addcongs congs = (simpset_ref() := simpset() addcongs congs); 
305 
fun Delcongs congs = (simpset_ref() := simpset() delcongs congs); 

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5115  307 

5496  308 
val meta_simps = 
309 
[triv_forall_equality, (* prunes params *) 

310 
True_implies_equals]; (* prune asms `True' *) 

311 

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val IFOL_simps = 
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[refl RS P_iff_T] @ conj_simps @ disj_simps @ not_simps @ 
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imp_simps @ iff_simps @ quant_simps; 
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val notFalseI = int_prove_fun "~False"; 
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val triv_rls = [TrueI,refl,reflexive_thm,iff_refl,notFalseI]; 
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fun unsafe_solver prems = FIRST'[resolve_tac (triv_rls@prems), 
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atac, etac FalseE]; 
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(*No premature instantiation of variables during simplification*) 
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fun safe_solver prems = FIRST'[match_tac (triv_rls@prems), 
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eq_assume_tac, ematch_tac [FalseE]]; 
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3910  325 
(*No simprules, but basic infastructure for simplification*) 
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val FOL_basic_ss = empty_ss setsubgoaler asm_simp_tac 
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addsimprocs [defALL_regroup,defEX_regroup] 
7570  328 
setSSolver (mk_solver "FOL safe" safe_solver) 
329 
setSolver (mk_solver "FOL unsafe" unsafe_solver) 

5304  330 
setmksimps (mksimps mksimps_pairs); 
331 

332 

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3910  334 
(*intuitionistic simprules only*) 
5496  335 
val IFOL_ss = 
336 
FOL_basic_ss addsimps (meta_simps @ IFOL_simps @ 

337 
int_ex_simps @ int_all_simps) 

338 
addcongs [imp_cong]; 

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val cla_simps = 
3910  341 
[de_Morgan_conj, de_Morgan_disj, imp_disj1, imp_disj2, 
342 
not_all, not_ex, cases_simp] @ 

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map prove_fun 
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["~(P&Q) <> ~P  ~Q", 
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"P  ~P", "~P  P", 
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"~ ~ P <> P", "(~P > P) <> P", 
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"(~P <> ~Q) <> (P<>Q)"]; 
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3910  349 
(*classical simprules too*) 
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val FOL_ss = IFOL_ss addsimps (cla_simps @ cla_ex_simps @ cla_all_simps); 
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val simpsetup = [fn thy => (simpset_ref_of thy := FOL_ss; thy)]; 
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5219  355 
(*** integration of simplifier with classical reasoner ***) 
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356 

5219  357 
structure Clasimp = ClasimpFun 
5555  358 
(structure Simplifier = Simplifier 
359 
and Classical = Cla 

360 
and Blast = Blast); 

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open Clasimp; 
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val FOL_css = (FOL_cs, FOL_ss); 