made repository layout more coherent with logical distribution structure; stripped some $Id$s
2 Author: Tobias Nipkow, Markus Wenzel, and Larry Paulson
5 header {* The basis of Higher-Order Logic *}
11 "~~/src/Tools/IsaPlanner/zipper.ML"
12 "~~/src/Tools/IsaPlanner/isand.ML"
13 "~~/src/Tools/IsaPlanner/rw_tools.ML"
14 "~~/src/Tools/IsaPlanner/rw_inst.ML"
15 "~~/src/Provers/project_rule.ML"
16 "~~/src/Provers/hypsubst.ML"
17 "~~/src/Provers/splitter.ML"
18 "~~/src/Provers/classical.ML"
19 "~~/src/Provers/blast.ML"
20 "~~/src/Provers/clasimp.ML"
21 "~~/src/Provers/coherent.ML"
22 "~~/src/Provers/eqsubst.ML"
23 "~~/src/Provers/quantifier1.ML"
25 "~~/src/Tools/random_word.ML"
26 "~~/src/Tools/atomize_elim.ML"
27 "~~/src/Tools/induct.ML"
28 ("~~/src/Tools/induct_tacs.ML")
29 "~~/src/Tools/code/code_name.ML"
30 "~~/src/Tools/code/code_funcgr.ML"
31 "~~/src/Tools/code/code_thingol.ML"
32 "~~/src/Tools/code/code_printer.ML"
33 "~~/src/Tools/code/code_target.ML"
34 "~~/src/Tools/code/code_ml.ML"
35 "~~/src/Tools/code/code_haskell.ML"
37 ("~~/src/HOL/Tools/recfun_codegen.ML")
40 subsection {* Primitive logic *}
42 subsubsection {* Core syntax *}
46 setup {* ObjectLogic.add_base_sort @{sort type} *}
49 "fun" :: (type, type) type
57 Trueprop :: "bool => prop" ("(_)" 5)
60 Not :: "bool => bool" ("~ _" [40] 40)
64 The :: "('a => bool) => 'a"
65 All :: "('a => bool) => bool" (binder "ALL " 10)
66 Ex :: "('a => bool) => bool" (binder "EX " 10)
67 Ex1 :: "('a => bool) => bool" (binder "EX! " 10)
68 Let :: "['a, 'a => 'b] => 'b"
70 "op =" :: "['a, 'a] => bool" (infixl "=" 50)
71 "op &" :: "[bool, bool] => bool" (infixr "&" 35)
72 "op |" :: "[bool, bool] => bool" (infixr "|" 30)
73 "op -->" :: "[bool, bool] => bool" (infixr "-->" 25)
78 If :: "[bool, 'a, 'a] => 'a" ("(if (_)/ then (_)/ else (_))" 10)
81 subsubsection {* Additional concrete syntax *}
87 not_equal :: "['a, 'a] => bool" (infixl "~=" 50) where
91 not_equal (infix "~=" 50)
94 Not ("\<not> _" [40] 40) and
95 "op &" (infixr "\<and>" 35) and
96 "op |" (infixr "\<or>" 30) and
97 "op -->" (infixr "\<longrightarrow>" 25) and
98 not_equal (infix "\<noteq>" 50)
100 notation (HTML output)
101 Not ("\<not> _" [40] 40) and
102 "op &" (infixr "\<and>" 35) and
103 "op |" (infixr "\<or>" 30) and
104 not_equal (infix "\<noteq>" 50)
107 iff :: "[bool, bool] => bool" (infixr "<->" 25) where
111 iff (infixr "\<longleftrightarrow>" 25)
119 "_The" :: "[pttrn, bool] => 'a" ("(3THE _./ _)" [0, 10] 10)
121 "_bind" :: "[pttrn, 'a] => letbind" ("(2_ =/ _)" 10)
122 "" :: "letbind => letbinds" ("_")
123 "_binds" :: "[letbind, letbinds] => letbinds" ("_;/ _")
124 "_Let" :: "[letbinds, 'a] => 'a" ("(let (_)/ in (_))" 10)
126 "_case_syntax":: "['a, cases_syn] => 'b" ("(case _ of/ _)" 10)
127 "_case1" :: "['a, 'b] => case_syn" ("(2_ =>/ _)" 10)
128 "" :: "case_syn => cases_syn" ("_")
129 "_case2" :: "[case_syn, cases_syn] => cases_syn" ("_/ | _")
132 "THE x. P" == "The (%x. P)"
133 "_Let (_binds b bs) e" == "_Let b (_Let bs e)"
134 "let x = a in e" == "Let a (%x. e)"
137 (* To avoid eta-contraction of body: *)
138 [("The", fn [Abs abs] =>
139 let val (x,t) = atomic_abs_tr' abs
140 in Syntax.const "_The" $ x $ t end)]
144 "_case1" :: "['a, 'b] => case_syn" ("(2_ \<Rightarrow>/ _)" 10)
147 All (binder "\<forall>" 10) and
148 Ex (binder "\<exists>" 10) and
149 Ex1 (binder "\<exists>!" 10)
151 notation (HTML output)
152 All (binder "\<forall>" 10) and
153 Ex (binder "\<exists>" 10) and
154 Ex1 (binder "\<exists>!" 10)
157 All (binder "! " 10) and
158 Ex (binder "? " 10) and
159 Ex1 (binder "?! " 10)
162 subsubsection {* Axioms and basic definitions *}
166 subst: "s = t \<Longrightarrow> P s \<Longrightarrow> P t"
167 ext: "(!!x::'a. (f x ::'b) = g x) ==> (%x. f x) = (%x. g x)"
168 -- {*Extensionality is built into the meta-logic, and this rule expresses
169 a related property. It is an eta-expanded version of the traditional
170 rule, and similar to the ABS rule of HOL*}
172 the_eq_trivial: "(THE x. x = a) = (a::'a)"
174 impI: "(P ==> Q) ==> P-->Q"
175 mp: "[| P-->Q; P |] ==> Q"
179 True_def: "True == ((%x::bool. x) = (%x. x))"
180 All_def: "All(P) == (P = (%x. True))"
181 Ex_def: "Ex(P) == !Q. (!x. P x --> Q) --> Q"
182 False_def: "False == (!P. P)"
183 not_def: "~ P == P-->False"
184 and_def: "P & Q == !R. (P-->Q-->R) --> R"
185 or_def: "P | Q == !R. (P-->R) --> (Q-->R) --> R"
186 Ex1_def: "Ex1(P) == ? x. P(x) & (! y. P(y) --> y=x)"
189 iff: "(P-->Q) --> (Q-->P) --> (P=Q)"
190 True_or_False: "(P=True) | (P=False)"
193 Let_def: "Let s f == f(s)"
194 if_def: "If P x y == THE z::'a. (P=True --> z=x) & (P=False --> z=y)"
205 "arbitrary \<equiv> undefined"
208 subsubsection {* Generic classes and algebraic operations *}
210 class default = type +
214 fixes zero :: 'a ("0")
217 fixes one :: 'a ("1")
219 hide (open) const zero one
222 fixes plus :: "'a \<Rightarrow> 'a \<Rightarrow> 'a" (infixl "+" 65)
225 fixes minus :: "'a \<Rightarrow> 'a \<Rightarrow> 'a" (infixl "-" 65)
227 class uminus = type +
228 fixes uminus :: "'a \<Rightarrow> 'a" ("- _" [81] 80)
231 fixes times :: "'a \<Rightarrow> 'a \<Rightarrow> 'a" (infixl "*" 70)
233 class inverse = type +
234 fixes inverse :: "'a \<Rightarrow> 'a"
235 and divide :: "'a \<Rightarrow> 'a \<Rightarrow> 'a" (infixl "'/" 70)
238 fixes abs :: "'a \<Rightarrow> 'a"
242 abs ("\<bar>_\<bar>")
244 notation (HTML output)
245 abs ("\<bar>_\<bar>")
250 fixes sgn :: "'a \<Rightarrow> 'a"
253 fixes less_eq :: "'a \<Rightarrow> 'a \<Rightarrow> bool"
254 and less :: "'a \<Rightarrow> 'a \<Rightarrow> bool"
258 less_eq ("op <=") and
259 less_eq ("(_/ <= _)" [51, 51] 50) and
261 less ("(_/ < _)" [51, 51] 50)
264 less_eq ("op \<le>") and
265 less_eq ("(_/ \<le> _)" [51, 51] 50)
267 notation (HTML output)
268 less_eq ("op \<le>") and
269 less_eq ("(_/ \<le> _)" [51, 51] 50)
272 greater_eq (infix ">=" 50) where
273 "x >= y \<equiv> y <= x"
276 greater_eq (infix "\<ge>" 50)
279 greater (infix ">" 50) where
280 "x > y \<equiv> y < x"
285 "_index1" :: index ("\<^sub>1")
287 (index) "\<^sub>1" => (index) "\<^bsub>\<struct>\<^esub>"
289 typed_print_translation {*
291 fun tr' c = (c, fn show_sorts => fn T => fn ts =>
292 if T = dummyT orelse not (! show_types) andalso can Term.dest_Type T then raise Match
293 else Syntax.const Syntax.constrainC $ Syntax.const c $ Syntax.term_of_typ show_sorts T);
294 in map tr' [@{const_syntax HOL.one}, @{const_syntax HOL.zero}] end;
295 *} -- {* show types that are presumably too general *}
298 subsection {* Fundamental rules *}
300 subsubsection {* Equality *}
302 lemma sym: "s = t ==> t = s"
303 by (erule subst) (rule refl)
305 lemma ssubst: "t = s ==> P s ==> P t"
306 by (drule sym) (erule subst)
308 lemma trans: "[| r=s; s=t |] ==> r=t"
311 lemma meta_eq_to_obj_eq:
312 assumes meq: "A == B"
314 by (unfold meq) (rule refl)
316 text {* Useful with @{text erule} for proving equalities from known equalities. *}
320 lemma box_equals: "[| a=b; a=c; b=d |] ==> c=d"
327 text {* For calculational reasoning: *}
329 lemma forw_subst: "a = b ==> P b ==> P a"
332 lemma back_subst: "P a ==> a = b ==> P b"
336 subsubsection {*Congruence rules for application*}
338 (*similar to AP_THM in Gordon's HOL*)
339 lemma fun_cong: "(f::'a=>'b) = g ==> f(x)=g(x)"
344 (*similar to AP_TERM in Gordon's HOL and FOL's subst_context*)
345 lemma arg_cong: "x=y ==> f(x)=f(y)"
350 lemma arg_cong2: "\<lbrakk> a = b; c = d \<rbrakk> \<Longrightarrow> f a c = f b d"
351 apply (erule ssubst)+
355 lemma cong: "[| f = g; (x::'a) = y |] ==> f(x) = g(y)"
361 subsubsection {*Equality of booleans -- iff*}
363 lemma iffI: assumes "P ==> Q" and "Q ==> P" shows "P=Q"
364 by (iprover intro: iff [THEN mp, THEN mp] impI assms)
366 lemma iffD2: "[| P=Q; Q |] ==> P"
369 lemma rev_iffD2: "[| Q; P=Q |] ==> P"
372 lemma iffD1: "Q = P \<Longrightarrow> Q \<Longrightarrow> P"
373 by (drule sym) (rule iffD2)
375 lemma rev_iffD1: "Q \<Longrightarrow> Q = P \<Longrightarrow> P"
376 by (drule sym) (rule rev_iffD2)
380 and minor: "[| P --> Q; Q --> P |] ==> R"
382 by (iprover intro: minor impI major [THEN iffD2] major [THEN iffD1])
385 subsubsection {*True*}
388 unfolding True_def by (rule refl)
390 lemma eqTrueI: "P ==> P = True"
391 by (iprover intro: iffI TrueI)
393 lemma eqTrueE: "P = True ==> P"
394 by (erule iffD2) (rule TrueI)
397 subsubsection {*Universal quantifier*}
399 lemma allI: assumes "!!x::'a. P(x)" shows "ALL x. P(x)"
400 unfolding All_def by (iprover intro: ext eqTrueI assms)
402 lemma spec: "ALL x::'a. P(x) ==> P(x)"
403 apply (unfold All_def)
405 apply (erule fun_cong)
409 assumes major: "ALL x. P(x)"
410 and minor: "P(x) ==> R"
412 by (iprover intro: minor major [THEN spec])
415 assumes major: "ALL x. P(x)"
416 and minor: "[| P(x); ALL x. P(x) |] ==> R"
418 by (iprover intro: minor major major [THEN spec])
421 subsubsection {* False *}
424 Depends upon @{text spec}; it is impossible to do propositional
425 logic before quantifiers!
428 lemma FalseE: "False ==> P"
429 apply (unfold False_def)
433 lemma False_neq_True: "False = True ==> P"
434 by (erule eqTrueE [THEN FalseE])
437 subsubsection {* Negation *}
440 assumes "P ==> False"
442 apply (unfold not_def)
443 apply (iprover intro: impI assms)
446 lemma False_not_True: "False ~= True"
448 apply (erule False_neq_True)
451 lemma True_not_False: "True ~= False"
454 apply (erule False_neq_True)
457 lemma notE: "[| ~P; P |] ==> R"
458 apply (unfold not_def)
459 apply (erule mp [THEN FalseE])
463 lemma notI2: "(P \<Longrightarrow> \<not> Pa) \<Longrightarrow> (P \<Longrightarrow> Pa) \<Longrightarrow> \<not> P"
464 by (erule notE [THEN notI]) (erule meta_mp)
467 subsubsection {*Implication*}
470 assumes "P-->Q" "P" "Q ==> R"
472 by (iprover intro: assms mp)
474 (* Reduces Q to P-->Q, allowing substitution in P. *)
475 lemma rev_mp: "[| P; P --> Q |] ==> Q"
476 by (iprover intro: mp)
482 by (iprover intro: notI minor major [THEN notE])
484 (*not used at all, but we already have the other 3 combinations *)
487 and minor: "P ==> ~Q"
489 by (iprover intro: notI minor major notE)
491 lemma not_sym: "t ~= s ==> s ~= t"
492 by (erule contrapos_nn) (erule sym)
494 lemma eq_neq_eq_imp_neq: "[| x = a ; a ~= b; b = y |] ==> x ~= y"
495 by (erule subst, erule ssubst, assumption)
497 (*still used in HOLCF*)
499 assumes pq: "P ==> Q"
502 apply (rule nq [THEN contrapos_nn])
506 subsubsection {*Existential quantifier*}
508 lemma exI: "P x ==> EX x::'a. P x"
509 apply (unfold Ex_def)
510 apply (iprover intro: allI allE impI mp)
514 assumes major: "EX x::'a. P(x)"
515 and minor: "!!x. P(x) ==> Q"
517 apply (rule major [unfolded Ex_def, THEN spec, THEN mp])
518 apply (iprover intro: impI [THEN allI] minor)
522 subsubsection {*Conjunction*}
524 lemma conjI: "[| P; Q |] ==> P&Q"
525 apply (unfold and_def)
526 apply (iprover intro: impI [THEN allI] mp)
529 lemma conjunct1: "[| P & Q |] ==> P"
530 apply (unfold and_def)
531 apply (iprover intro: impI dest: spec mp)
534 lemma conjunct2: "[| P & Q |] ==> Q"
535 apply (unfold and_def)
536 apply (iprover intro: impI dest: spec mp)
541 and minor: "[| P; Q |] ==> R"
544 apply (rule major [THEN conjunct1])
545 apply (rule major [THEN conjunct2])
549 assumes "P" "P ==> Q" shows "P & Q"
550 by (iprover intro: conjI assms)
553 subsubsection {*Disjunction*}
555 lemma disjI1: "P ==> P|Q"
556 apply (unfold or_def)
557 apply (iprover intro: allI impI mp)
560 lemma disjI2: "Q ==> P|Q"
561 apply (unfold or_def)
562 apply (iprover intro: allI impI mp)
567 and minorP: "P ==> R"
568 and minorQ: "Q ==> R"
570 by (iprover intro: minorP minorQ impI
571 major [unfolded or_def, THEN spec, THEN mp, THEN mp])
574 subsubsection {*Classical logic*}
577 assumes prem: "~P ==> P"
579 apply (rule True_or_False [THEN disjE, THEN eqTrueE])
581 apply (rule notI [THEN prem, THEN eqTrueI])
586 lemmas ccontr = FalseE [THEN classical, standard]
588 (*notE with premises exchanged; it discharges ~R so that it can be used to
589 make elimination rules*)
592 and premnot: "~R ==> ~P"
595 apply (erule notE [OF premnot premp])
598 (*Double negation law*)
599 lemma notnotD: "~~P ==> P"
600 apply (rule classical)
609 by (iprover intro: classical p1 p2 notE)
612 subsubsection {*Unique existence*}
615 assumes "P a" "!!x. P(x) ==> x=a"
617 by (unfold Ex1_def, iprover intro: assms exI conjI allI impI)
619 text{*Sometimes easier to use: the premises have no shared variables. Safe!*}
621 assumes ex_prem: "EX x. P(x)"
622 and eq: "!!x y. [| P(x); P(y) |] ==> x=y"
624 by (iprover intro: ex_prem [THEN exE] ex1I eq)
627 assumes major: "EX! x. P(x)"
628 and minor: "!!x. [| P(x); ALL y. P(y) --> y=x |] ==> R"
630 apply (rule major [unfolded Ex1_def, THEN exE])
632 apply (iprover intro: minor)
635 lemma ex1_implies_ex: "EX! x. P x ==> EX x. P x"
642 subsubsection {*THE: definite description operator*}
646 and premx: "!!x. P x ==> x=a"
647 shows "(THE x. P x) = a"
648 apply (rule trans [OF _ the_eq_trivial])
649 apply (rule_tac f = "The" in arg_cong)
653 apply (erule ssubst, rule prema)
657 assumes "P a" and "!!x. P x ==> x=a"
658 shows "P (THE x. P x)"
659 by (iprover intro: assms the_equality [THEN ssubst])
661 lemma theI': "EX! x. P x ==> P (THE x. P x)"
669 (*Easier to apply than theI: only one occurrence of P*)
671 assumes "P a" "!!x. P x ==> x=a" "!!x. P x ==> Q x"
672 shows "Q (THE x. P x)"
673 by (iprover intro: assms theI)
675 lemma the1I2: assumes "EX! x. P x" "\<And>x. P x \<Longrightarrow> Q x" shows "Q (THE x. P x)"
676 by(iprover intro:assms(2) theI2[where P=P and Q=Q] ex1E[OF assms(1)]
679 lemma the1_equality [elim?]: "[| EX!x. P x; P a |] ==> (THE x. P x) = a"
680 apply (rule the_equality)
683 apply (erule all_dupE)
692 lemma the_sym_eq_trivial: "(THE y. x=y) = x"
693 apply (rule the_equality)
699 subsubsection {*Classical intro rules for disjunction and existential quantifiers*}
702 assumes "~Q ==> P" shows "P|Q"
703 apply (rule classical)
704 apply (iprover intro: assms disjI1 disjI2 notI elim: notE)
707 lemma excluded_middle: "~P | P"
708 by (iprover intro: disjCI)
711 case distinction as a natural deduction rule.
712 Note that @{term "~P"} is the second case, not the first
714 lemma case_split [case_names True False]:
715 assumes prem1: "P ==> Q"
716 and prem2: "~P ==> Q"
718 apply (rule excluded_middle [THEN disjE])
723 (*Classical implies (-->) elimination. *)
725 assumes major: "P-->Q"
726 and minor: "~P ==> R" "Q ==> R"
728 apply (rule excluded_middle [of P, THEN disjE])
729 apply (iprover intro: minor major [THEN mp])+
732 (*This version of --> elimination works on Q before P. It works best for
733 those cases in which P holds "almost everywhere". Can't install as
734 default: would break old proofs.*)
736 assumes major: "P-->Q"
737 and minor: "Q ==> R" "~P ==> R"
739 apply (rule excluded_middle [of P, THEN disjE])
740 apply (iprover intro: minor major [THEN mp])+
743 (*Classical <-> elimination. *)
746 and minor: "[| P; Q |] ==> R" "[| ~P; ~Q |] ==> R"
748 apply (rule major [THEN iffE])
749 apply (iprover intro: minor elim: impCE notE)
753 assumes "ALL x. ~P(x) ==> P(a)"
756 apply (iprover intro: assms exI allI notI notE [of "\<exists>x. P x"])
760 subsubsection {* Intuitionistic Reasoning *}
765 and 3: "P --> Q ==> P"
768 from 3 and 1 have P .
769 with 1 have Q by (rule impE)
774 assumes 1: "ALL x. P x"
775 and 2: "P x ==> ALL x. P x ==> Q"
778 from 1 have "P x" by (rule spec)
779 from this and 1 show Q by (rule 2)
787 from 2 and 1 have P .
788 with 1 show R by (rule notE)
791 lemma TrueE: "True ==> P ==> P" .
792 lemma notFalseE: "~ False ==> P ==> P" .
794 lemmas [Pure.elim!] = disjE iffE FalseE conjE exE TrueE notFalseE
795 and [Pure.intro!] = iffI conjI impI TrueI notI allI refl
796 and [Pure.elim 2] = allE notE' impE'
797 and [Pure.intro] = exI disjI2 disjI1
799 lemmas [trans] = trans
800 and [sym] = sym not_sym
801 and [Pure.elim?] = iffD1 iffD2 impE
803 use "Tools/hologic.ML"
806 subsubsection {* Atomizing meta-level connectives *}
809 eq_reflection: "x = y \<Longrightarrow> x \<equiv> y" (*admissible axiom*)
811 lemma atomize_all [atomize]: "(!!x. P x) == Trueprop (ALL x. P x)"
814 then show "ALL x. P x" ..
817 then show "!!x. P x" by (rule allE)
820 lemma atomize_imp [atomize]: "(A ==> B) == Trueprop (A --> B)"
823 show "A --> B" by (rule impI) (rule r)
825 assume "A --> B" and A
826 then show B by (rule mp)
829 lemma atomize_not: "(A ==> False) == Trueprop (~A)"
831 assume r: "A ==> False"
832 show "~A" by (rule notI) (rule r)
835 then show False by (rule notE)
838 lemma atomize_eq [atomize]: "(x == y) == Trueprop (x = y)"
841 show "x = y" by (unfold `x == y`) (rule refl)
844 then show "x == y" by (rule eq_reflection)
847 lemma atomize_conj [atomize]: "(A &&& B) == Trueprop (A & B)"
849 assume conj: "A &&& B"
852 from conj show A by (rule conjunctionD1)
853 from conj show B by (rule conjunctionD2)
864 lemmas [symmetric, rulify] = atomize_all atomize_imp
865 and [symmetric, defn] = atomize_all atomize_imp atomize_eq
868 subsubsection {* Atomizing elimination rules *}
870 setup AtomizeElim.setup
872 lemma atomize_exL[atomize_elim]: "(!!x. P x ==> Q) == ((EX x. P x) ==> Q)"
875 lemma atomize_conjL[atomize_elim]: "(A ==> B ==> C) == (A & B ==> C)"
878 lemma atomize_disjL[atomize_elim]: "((A ==> C) ==> (B ==> C) ==> C) == ((A | B ==> C) ==> C)"
881 lemma atomize_elimL[atomize_elim]: "(!!B. (A ==> B) ==> B) == Trueprop A" ..
884 subsection {* Package setup *}
886 subsubsection {* Classical Reasoner setup *}
888 lemma imp_elim: "P --> Q ==> (~ R ==> P) ==> (Q ==> R) ==> R"
889 by (rule classical) iprover
891 lemma swap: "~ P ==> (~ R ==> P) ==> R"
892 by (rule classical) iprover
895 "\<And>X. \<lbrakk> x=x; PROP W \<rbrakk> \<Longrightarrow> PROP W" .
898 structure Hypsubst = HypsubstFun(
900 structure Simplifier = Simplifier
901 val dest_eq = HOLogic.dest_eq
902 val dest_Trueprop = HOLogic.dest_Trueprop
903 val dest_imp = HOLogic.dest_imp
904 val eq_reflection = @{thm eq_reflection}
905 val rev_eq_reflection = @{thm meta_eq_to_obj_eq}
906 val imp_intr = @{thm impI}
907 val rev_mp = @{thm rev_mp}
908 val subst = @{thm subst}
910 val thin_refl = @{thm thin_refl};
911 val prop_subst = @{lemma "PROP P t ==> PROP prop (x = t ==> PROP P x)"
912 by (unfold prop_def) (drule eq_reflection, unfold)}
916 structure Classical = ClassicalFun(
918 val imp_elim = @{thm imp_elim}
919 val not_elim = @{thm notE}
920 val swap = @{thm swap}
921 val classical = @{thm classical}
922 val sizef = Drule.size_of_thm
923 val hyp_subst_tacs = [Hypsubst.hyp_subst_tac]
926 structure BasicClassical: BASIC_CLASSICAL = Classical;
929 ML_Antiquote.value "claset"
930 (Scan.succeed "Classical.local_claset_of (ML_Context.the_local_context ())");
932 structure ResAtpset = NamedThmsFun(val name = "atp" val description = "ATP rules");
934 structure ResBlacklist = NamedThmsFun(val name = "noatp" val description = "Theorems blacklisted for ATP");
937 text {*ResBlacklist holds theorems blacklisted to sledgehammer.
938 These theorems typically produce clauses that are prolific (match too many equality or
939 membership literals) and relate to seldom-used facts. Some duplicate other rules.*}
943 (*prevent substitution on bool*)
944 fun hyp_subst_tac' i thm = if i <= Thm.nprems_of thm andalso
945 Term.exists_Const (fn ("op =", Type (_, [T, _])) => T <> Type ("bool", []) | _ => false)
946 (nth (Thm.prems_of thm) (i - 1)) then Hypsubst.hyp_subst_tac i thm else no_tac thm;
948 Hypsubst.hypsubst_setup
949 #> ContextRules.addSWrapper (fn tac => hyp_subst_tac' ORELSE' tac)
952 #> ResBlacklist.setup
956 declare iffI [intro!]
964 declare iffCE [elim!]
971 declare ex_ex1I [intro!]
973 and the_equality [intro]
979 ML {* val HOL_cs = @{claset} *}
981 lemma contrapos_np: "~ Q ==> (~ P ==> Q) ==> P"
983 apply (erule (1) meta_mp)
986 declare ex_ex1I [rule del, intro! 2]
989 lemmas [intro?] = ext
990 and [elim?] = ex1_implies_ex
992 (*Better then ex1E for classical reasoner: needs no quantifier duplication!*)
993 lemma alt_ex1E [elim!]:
994 assumes major: "\<exists>!x. P x"
995 and prem: "\<And>x. \<lbrakk> P x; \<forall>y y'. P y \<and> P y' \<longrightarrow> y = y' \<rbrakk> \<Longrightarrow> R"
997 apply (rule ex1E [OF major])
999 apply (tactic {* ares_tac @{thms allI} 1 *})+
1000 apply (tactic {* etac (Classical.dup_elim @{thm allE}) 1 *})
1005 structure Blast = BlastFun
1007 type claset = Classical.claset
1008 val equality_name = @{const_name "op ="}
1009 val not_name = @{const_name Not}
1010 val notE = @{thm notE}
1011 val ccontr = @{thm ccontr}
1012 val contr_tac = Classical.contr_tac
1013 val dup_intr = Classical.dup_intr
1014 val hyp_subst_tac = Hypsubst.blast_hyp_subst_tac
1015 val claset = Classical.claset
1016 val rep_cs = Classical.rep_cs
1017 val cla_modifiers = Classical.cla_modifiers
1018 val cla_meth' = Classical.cla_meth'
1020 val Blast_tac = Blast.Blast_tac;
1021 val blast_tac = Blast.blast_tac;
1027 subsubsection {* Simplifier *}
1029 lemma eta_contract_eq: "(%s. f s) = f" ..
1032 shows not_not: "(~ ~ P) = P"
1033 and Not_eq_iff: "((~P) = (~Q)) = (P = Q)"
1035 "(P ~= Q) = (P = (~Q))"
1036 "(P | ~P) = True" "(~P | P) = True"
1038 and not_True_eq_False: "(\<not> True) = False"
1039 and not_False_eq_True: "(\<not> False) = True"
1041 "(~P) ~= P" "P ~= (~P)"
1043 and eq_True: "(P = True) = P"
1044 and "(False=P) = (~P)"
1045 and eq_False: "(P = False) = (\<not> P)"
1047 "(True --> P) = P" "(False --> P) = True"
1048 "(P --> True) = True" "(P --> P) = True"
1049 "(P --> False) = (~P)" "(P --> ~P) = (~P)"
1050 "(P & True) = P" "(True & P) = P"
1051 "(P & False) = False" "(False & P) = False"
1052 "(P & P) = P" "(P & (P & Q)) = (P & Q)"
1053 "(P & ~P) = False" "(~P & P) = False"
1054 "(P | True) = True" "(True | P) = True"
1055 "(P | False) = P" "(False | P) = P"
1056 "(P | P) = P" "(P | (P | Q)) = (P | Q)" and
1057 "(ALL x. P) = P" "(EX x. P) = P" "EX x. x=t" "EX x. t=x"
1058 -- {* needed for the one-point-rule quantifier simplification procs *}
1059 -- {* essential for termination!! *} and
1060 "!!P. (EX x. x=t & P(x)) = P(t)"
1061 "!!P. (EX x. t=x & P(x)) = P(t)"
1062 "!!P. (ALL x. x=t --> P(x)) = P(t)"
1063 "!!P. (ALL x. t=x --> P(x)) = P(t)"
1064 by (blast, blast, blast, blast, blast, iprover+)
1066 lemma disj_absorb: "(A | A) = A"
1069 lemma disj_left_absorb: "(A | (A | B)) = (A | B)"
1072 lemma conj_absorb: "(A & A) = A"
1075 lemma conj_left_absorb: "(A & (A & B)) = (A & B)"
1079 shows eq_commute: "(a=b) = (b=a)"
1080 and eq_left_commute: "(P=(Q=R)) = (Q=(P=R))"
1081 and eq_assoc: "((P=Q)=R) = (P=(Q=R))" by (iprover, blast+)
1082 lemma neq_commute: "(a~=b) = (b~=a)" by iprover
1085 shows conj_commute: "(P&Q) = (Q&P)"
1086 and conj_left_commute: "(P&(Q&R)) = (Q&(P&R))" by iprover+
1087 lemma conj_assoc: "((P&Q)&R) = (P&(Q&R))" by iprover
1089 lemmas conj_ac = conj_commute conj_left_commute conj_assoc
1092 shows disj_commute: "(P|Q) = (Q|P)"
1093 and disj_left_commute: "(P|(Q|R)) = (Q|(P|R))" by iprover+
1094 lemma disj_assoc: "((P|Q)|R) = (P|(Q|R))" by iprover
1096 lemmas disj_ac = disj_commute disj_left_commute disj_assoc
1098 lemma conj_disj_distribL: "(P&(Q|R)) = (P&Q | P&R)" by iprover
1099 lemma conj_disj_distribR: "((P|Q)&R) = (P&R | Q&R)" by iprover
1101 lemma disj_conj_distribL: "(P|(Q&R)) = ((P|Q) & (P|R))" by iprover
1102 lemma disj_conj_distribR: "((P&Q)|R) = ((P|R) & (Q|R))" by iprover
1104 lemma imp_conjR: "(P --> (Q&R)) = ((P-->Q) & (P-->R))" by iprover
1105 lemma imp_conjL: "((P&Q) -->R) = (P --> (Q --> R))" by iprover
1106 lemma imp_disjL: "((P|Q) --> R) = ((P-->R)&(Q-->R))" by iprover
1108 text {* These two are specialized, but @{text imp_disj_not1} is useful in @{text "Auth/Yahalom"}. *}
1109 lemma imp_disj_not1: "(P --> Q | R) = (~Q --> P --> R)" by blast
1110 lemma imp_disj_not2: "(P --> Q | R) = (~R --> P --> Q)" by blast
1112 lemma imp_disj1: "((P-->Q)|R) = (P--> Q|R)" by blast
1113 lemma imp_disj2: "(Q|(P-->R)) = (P--> Q|R)" by blast
1115 lemma imp_cong: "(P = P') ==> (P' ==> (Q = Q')) ==> ((P --> Q) = (P' --> Q'))"
1118 lemma de_Morgan_disj: "(~(P | Q)) = (~P & ~Q)" by iprover
1119 lemma de_Morgan_conj: "(~(P & Q)) = (~P | ~Q)" by blast
1120 lemma not_imp: "(~(P --> Q)) = (P & ~Q)" by blast
1121 lemma not_iff: "(P~=Q) = (P = (~Q))" by blast
1122 lemma disj_not1: "(~P | Q) = (P --> Q)" by blast
1123 lemma disj_not2: "(P | ~Q) = (Q --> P)" -- {* changes orientation :-( *}
1125 lemma imp_conv_disj: "(P --> Q) = ((~P) | Q)" by blast
1127 lemma iff_conv_conj_imp: "(P = Q) = ((P --> Q) & (Q --> P))" by iprover
1130 lemma cases_simp: "((P --> Q) & (~P --> Q)) = Q"
1131 -- {* Avoids duplication of subgoals after @{text split_if}, when the true and false *}
1132 -- {* cases boil down to the same thing. *}
1135 lemma not_all: "(~ (! x. P(x))) = (? x.~P(x))" by blast
1136 lemma imp_all: "((! x. P x) --> Q) = (? x. P x --> Q)" by blast
1137 lemma not_ex: "(~ (? x. P(x))) = (! x.~P(x))" by iprover
1138 lemma imp_ex: "((? x. P x) --> Q) = (! x. P x --> Q)" by iprover
1139 lemma all_not_ex: "(ALL x. P x) = (~ (EX x. ~ P x ))" by blast
1141 declare All_def [noatp]
1143 lemma ex_disj_distrib: "(? x. P(x) | Q(x)) = ((? x. P(x)) | (? x. Q(x)))" by iprover
1144 lemma all_conj_distrib: "(!x. P(x) & Q(x)) = ((! x. P(x)) & (! x. Q(x)))" by iprover
1147 \medskip The @{text "&"} congruence rule: not included by default!
1148 May slow rewrite proofs down by as much as 50\% *}
1151 "(P = P') ==> (P' ==> (Q = Q')) ==> ((P & Q) = (P' & Q'))"
1154 lemma rev_conj_cong:
1155 "(Q = Q') ==> (Q' ==> (P = P')) ==> ((P & Q) = (P' & Q'))"
1158 text {* The @{text "|"} congruence rule: not included by default! *}
1161 "(P = P') ==> (~P' ==> (Q = Q')) ==> ((P | Q) = (P' | Q'))"
1165 text {* \medskip if-then-else rules *}
1167 lemma if_True: "(if True then x else y) = x"
1168 by (unfold if_def) blast
1170 lemma if_False: "(if False then x else y) = y"
1171 by (unfold if_def) blast
1173 lemma if_P: "P ==> (if P then x else y) = x"
1174 by (unfold if_def) blast
1176 lemma if_not_P: "~P ==> (if P then x else y) = y"
1177 by (unfold if_def) blast
1179 lemma split_if: "P (if Q then x else y) = ((Q --> P(x)) & (~Q --> P(y)))"
1180 apply (rule case_split [of Q])
1181 apply (simplesubst if_P)
1182 prefer 3 apply (simplesubst if_not_P, blast+)
1185 lemma split_if_asm: "P (if Q then x else y) = (~((Q & ~P x) | (~Q & ~P y)))"
1186 by (simplesubst split_if, blast)
1188 lemmas if_splits [noatp] = split_if split_if_asm
1190 lemma if_cancel: "(if c then x else x) = x"
1191 by (simplesubst split_if, blast)
1193 lemma if_eq_cancel: "(if x = y then y else x) = x"
1194 by (simplesubst split_if, blast)
1196 lemma if_bool_eq_conj: "(if P then Q else R) = ((P-->Q) & (~P-->R))"
1197 -- {* This form is useful for expanding @{text "if"}s on the RIGHT of the @{text "==>"} symbol. *}
1200 lemma if_bool_eq_disj: "(if P then Q else R) = ((P&Q) | (~P&R))"
1201 -- {* And this form is useful for expanding @{text "if"}s on the LEFT. *}
1202 apply (simplesubst split_if, blast)
1205 lemma Eq_TrueI: "P ==> P == True" by (unfold atomize_eq) iprover
1206 lemma Eq_FalseI: "~P ==> P == False" by (unfold atomize_eq) iprover
1208 text {* \medskip let rules for simproc *}
1210 lemma Let_folded: "f x \<equiv> g x \<Longrightarrow> Let x f \<equiv> Let x g"
1213 lemma Let_unfold: "f x \<equiv> g \<Longrightarrow> Let x f \<equiv> g"
1217 The following copy of the implication operator is useful for
1218 fine-tuning congruence rules. It instructs the simplifier to simplify
1223 simp_implies :: "[prop, prop] => prop" (infixr "=simp=>" 1)
1224 [code del]: "simp_implies \<equiv> op ==>"
1226 lemma simp_impliesI:
1227 assumes PQ: "(PROP P \<Longrightarrow> PROP Q)"
1228 shows "PROP P =simp=> PROP Q"
1229 apply (unfold simp_implies_def)
1234 lemma simp_impliesE:
1235 assumes PQ: "PROP P =simp=> PROP Q"
1237 and QR: "PROP Q \<Longrightarrow> PROP R"
1240 apply (rule PQ [unfolded simp_implies_def])
1244 lemma simp_implies_cong:
1245 assumes PP' :"PROP P == PROP P'"
1246 and P'QQ': "PROP P' ==> (PROP Q == PROP Q')"
1247 shows "(PROP P =simp=> PROP Q) == (PROP P' =simp=> PROP Q')"
1248 proof (unfold simp_implies_def, rule equal_intr_rule)
1249 assume PQ: "PROP P \<Longrightarrow> PROP Q"
1251 from PP' [symmetric] and P' have "PROP P"
1252 by (rule equal_elim_rule1)
1253 then have "PROP Q" by (rule PQ)
1254 with P'QQ' [OF P'] show "PROP Q'" by (rule equal_elim_rule1)
1256 assume P'Q': "PROP P' \<Longrightarrow> PROP Q'"
1258 from PP' and P have P': "PROP P'" by (rule equal_elim_rule1)
1259 then have "PROP Q'" by (rule P'Q')
1260 with P'QQ' [OF P', symmetric] show "PROP Q"
1261 by (rule equal_elim_rule1)
1265 assumes "P \<longrightarrow> Q \<longrightarrow> R"
1266 shows "P \<and> Q \<longrightarrow> R"
1267 using assms by blast
1270 assumes "\<And>x. P x = Q x"
1271 shows "(\<forall>x. P x) = (\<forall>x. Q x)"
1272 using assms by blast
1275 assumes "\<And>x. P x = Q x"
1276 shows "(\<exists>x. P x) = (\<exists>x. Q x)"
1277 using assms by blast
1280 "(\<forall>x y. P x y) = (\<forall>y x. P x y)"
1284 "(\<exists>x y. P x y) = (\<exists>y x. P x y)"
1287 use "Tools/simpdata.ML"
1288 ML {* open Simpdata *}
1291 Simplifier.method_setup Splitter.split_modifiers
1292 #> Simplifier.map_simpset (K Simpdata.simpset_simprocs)
1298 text {* Simproc for proving @{text "(y = x) == False"} from premise @{text "~(x = y)"}: *}
1300 simproc_setup neq ("x = y") = {* fn _ =>
1302 val neq_to_EQ_False = @{thm not_sym} RS @{thm Eq_FalseI};
1303 fun is_neq eq lhs rhs thm =
1304 (case Thm.prop_of thm of
1305 _ $ (Not $ (eq' $ l' $ r')) =>
1306 Not = HOLogic.Not andalso eq' = eq andalso
1307 r' aconv lhs andalso l' aconv rhs
1310 (case Thm.term_of ct of
1312 (case find_first (is_neq eq lhs rhs) (Simplifier.prems_of_ss ss) of
1313 SOME thm => SOME (thm RS neq_to_EQ_False)
1319 simproc_setup let_simp ("Let x f") = {*
1321 val (f_Let_unfold, x_Let_unfold) =
1322 let val [(_ $ (f $ x) $ _)] = prems_of @{thm Let_unfold}
1323 in (cterm_of @{theory} f, cterm_of @{theory} x) end
1324 val (f_Let_folded, x_Let_folded) =
1325 let val [(_ $ (f $ x) $ _)] = prems_of @{thm Let_folded}
1326 in (cterm_of @{theory} f, cterm_of @{theory} x) end;
1328 let val [(_ $ _ $ (g $ _))] = prems_of @{thm Let_folded}
1329 in cterm_of @{theory} g end;
1330 fun count_loose (Bound i) k = if i >= k then 1 else 0
1331 | count_loose (s $ t) k = count_loose s k + count_loose t k
1332 | count_loose (Abs (_, _, t)) k = count_loose t (k + 1)
1333 | count_loose _ _ = 0;
1334 fun is_trivial_let (Const (@{const_name Let}, _) $ x $ t) =
1336 of Abs (_, _, t') => count_loose t' 0 <= 1
1338 in fn _ => fn ss => fn ct => if is_trivial_let (Thm.term_of ct)
1339 then SOME @{thm Let_def} (*no or one ocurrenc of bound variable*)
1340 else let (*Norbert Schirmer's case*)
1341 val ctxt = Simplifier.the_context ss;
1342 val thy = ProofContext.theory_of ctxt;
1343 val t = Thm.term_of ct;
1344 val ([t'], ctxt') = Variable.import_terms false [t] ctxt;
1345 in Option.map (hd o Variable.export ctxt' ctxt o single)
1346 (case t' of Const (@{const_name Let},_) $ x $ f => (* x and f are already in normal form *)
1347 if is_Free x orelse is_Bound x orelse is_Const x
1348 then SOME @{thm Let_def}
1351 val n = case f of (Abs (x, _, _)) => x | _ => "x";
1352 val cx = cterm_of thy x;
1353 val {T = xT, ...} = rep_cterm cx;
1354 val cf = cterm_of thy f;
1355 val fx_g = Simplifier.rewrite ss (Thm.capply cf cx);
1356 val (_ $ _ $ g) = prop_of fx_g;
1357 val g' = abstract_over (x,g);
1362 cterm_instantiate [(f_Let_unfold, cf), (x_Let_unfold, cx)] @{thm Let_unfold};
1363 in SOME (rl OF [fx_g]) end
1364 else if Term.betapply (f, x) aconv g then NONE (*avoid identity conversion*)
1366 val abs_g'= Abs (n,xT,g');
1368 val g_g'x = symmetric (beta_conversion false (cterm_of thy g'x));
1369 val rl = cterm_instantiate
1370 [(f_Let_folded, cterm_of thy f), (x_Let_folded, cx),
1371 (g_Let_folded, cterm_of thy abs_g')]
1373 in SOME (rl OF [transitive fx_g g_g'x])
1380 lemma True_implies_equals: "(True \<Longrightarrow> PROP P) \<equiv> PROP P"
1382 assume "True \<Longrightarrow> PROP P"
1383 from this [OF TrueI] show "PROP P" .
1386 then show "PROP P" .
1390 "!!P Q. (EX x. P x & Q) = ((EX x. P x) & Q)"
1391 "!!P Q. (EX x. P & Q x) = (P & (EX x. Q x))"
1392 "!!P Q. (EX x. P x | Q) = ((EX x. P x) | Q)"
1393 "!!P Q. (EX x. P | Q x) = (P | (EX x. Q x))"
1394 "!!P Q. (EX x. P x --> Q) = ((ALL x. P x) --> Q)"
1395 "!!P Q. (EX x. P --> Q x) = (P --> (EX x. Q x))"
1396 -- {* Miniscoping: pushing in existential quantifiers. *}
1397 by (iprover | blast)+
1400 "!!P Q. (ALL x. P x & Q) = ((ALL x. P x) & Q)"
1401 "!!P Q. (ALL x. P & Q x) = (P & (ALL x. Q x))"
1402 "!!P Q. (ALL x. P x | Q) = ((ALL x. P x) | Q)"
1403 "!!P Q. (ALL x. P | Q x) = (P | (ALL x. Q x))"
1404 "!!P Q. (ALL x. P x --> Q) = ((EX x. P x) --> Q)"
1405 "!!P Q. (ALL x. P --> Q x) = (P --> (ALL x. Q x))"
1406 -- {* Miniscoping: pushing in universal quantifiers. *}
1407 by (iprover | blast)+
1410 triv_forall_equality (*prunes params*)
1411 True_implies_equals (*prune asms `True'*)
1417 (*In general it seems wrong to add distributive laws by default: they
1418 might cause exponential blow-up. But imp_disjL has been in for a while
1419 and cannot be removed without affecting existing proofs. Moreover,
1420 rewriting by "(P|Q --> R) = ((P-->R)&(Q-->R))" might be justified on the
1421 grounds that it allows simplification of R in the two cases.*)
1439 lemmas [cong] = imp_cong simp_implies_cong
1440 lemmas [split] = split_if
1442 ML {* val HOL_ss = @{simpset} *}
1444 text {* Simplifies x assuming c and y assuming ~c *}
1447 and "c \<Longrightarrow> x = u"
1448 and "\<not> c \<Longrightarrow> y = v"
1449 shows "(if b then x else y) = (if c then u else v)"
1450 unfolding if_def using assms by simp
1452 text {* Prevents simplification of x and y:
1453 faster and allows the execution of functional programs. *}
1454 lemma if_weak_cong [cong]:
1456 shows "(if b then x else y) = (if c then x else y)"
1457 using assms by (rule arg_cong)
1459 text {* Prevents simplification of t: much faster *}
1460 lemma let_weak_cong:
1462 shows "(let x = a in t x) = (let x = b in t x)"
1463 using assms by (rule arg_cong)
1465 text {* To tidy up the result of a simproc. Only the RHS will be simplified. *}
1468 shows "(t \<equiv> u) \<equiv> (t \<equiv> u')"
1472 "f (if c then x else y) = (if c then f x else f y)"
1475 text {* This lemma restricts the effect of the rewrite rule u=v to the left-hand
1476 side of an equality. Used in @{text "{Integ,Real}/simproc.ML"} *}
1477 lemma restrict_to_left:
1479 shows "(x = z) = (y = z)"
1483 subsubsection {* Generic cases and induction *}
1485 text {* Rule projections: *}
1488 structure ProjectRule = ProjectRuleFun
1490 val conjunct1 = @{thm conjunct1}
1491 val conjunct2 = @{thm conjunct2}
1497 induct_forall where "induct_forall P == \<forall>x. P x"
1498 induct_implies where "induct_implies A B == A \<longrightarrow> B"
1499 induct_equal where "induct_equal x y == x = y"
1500 induct_conj where "induct_conj A B == A \<and> B"
1502 lemma induct_forall_eq: "(!!x. P x) == Trueprop (induct_forall (\<lambda>x. P x))"
1503 by (unfold atomize_all induct_forall_def)
1505 lemma induct_implies_eq: "(A ==> B) == Trueprop (induct_implies A B)"
1506 by (unfold atomize_imp induct_implies_def)
1508 lemma induct_equal_eq: "(x == y) == Trueprop (induct_equal x y)"
1509 by (unfold atomize_eq induct_equal_def)
1511 lemma induct_conj_eq: "(A &&& B) == Trueprop (induct_conj A B)"
1512 by (unfold atomize_conj induct_conj_def)
1514 lemmas induct_atomize = induct_forall_eq induct_implies_eq induct_equal_eq induct_conj_eq
1515 lemmas induct_rulify [symmetric, standard] = induct_atomize
1516 lemmas induct_rulify_fallback =
1517 induct_forall_def induct_implies_def induct_equal_def induct_conj_def
1520 lemma induct_forall_conj: "induct_forall (\<lambda>x. induct_conj (A x) (B x)) =
1521 induct_conj (induct_forall A) (induct_forall B)"
1522 by (unfold induct_forall_def induct_conj_def) iprover
1524 lemma induct_implies_conj: "induct_implies C (induct_conj A B) =
1525 induct_conj (induct_implies C A) (induct_implies C B)"
1526 by (unfold induct_implies_def induct_conj_def) iprover
1528 lemma induct_conj_curry: "(induct_conj A B ==> PROP C) == (A ==> B ==> PROP C)"
1530 assume r: "induct_conj A B ==> PROP C" and A B
1531 show "PROP C" by (rule r) (simp add: induct_conj_def `A` `B`)
1533 assume r: "A ==> B ==> PROP C" and "induct_conj A B"
1534 show "PROP C" by (rule r) (simp_all add: `induct_conj A B` [unfolded induct_conj_def])
1537 lemmas induct_conj = induct_forall_conj induct_implies_conj induct_conj_curry
1539 hide const induct_forall induct_implies induct_equal induct_conj
1541 text {* Method setup. *}
1544 structure Induct = InductFun
1546 val cases_default = @{thm case_split}
1547 val atomize = @{thms induct_atomize}
1548 val rulify = @{thms induct_rulify}
1549 val rulify_fallback = @{thms induct_rulify_fallback}
1555 use "~~/src/Tools/induct_tacs.ML"
1556 setup InductTacs.setup
1559 subsubsection {* Coherent logic *}
1562 structure Coherent = CoherentFun
1564 val atomize_elimL = @{thm atomize_elimL}
1565 val atomize_exL = @{thm atomize_exL}
1566 val atomize_conjL = @{thm atomize_conjL}
1567 val atomize_disjL = @{thm atomize_disjL}
1568 val operator_names =
1569 [@{const_name "op |"}, @{const_name "op &"}, @{const_name "Ex"}]
1573 setup Coherent.setup
1576 subsection {* Other simple lemmas and lemma duplicates *}
1578 lemma Let_0 [simp]: "Let 0 f = f 0"
1579 unfolding Let_def ..
1581 lemma Let_1 [simp]: "Let 1 f = f 1"
1582 unfolding Let_def ..
1584 lemma ex1_eq [iff]: "EX! x. x = t" "EX! x. t = x"
1587 lemma choice_eq: "(ALL x. EX! y. P x y) = (EX! f. ALL x. P x (f x))"
1589 apply (rule_tac a = "%x. THE y. P x y" in ex1I)
1590 apply (fast dest!: theI')
1591 apply (fast intro: ext the1_equality [symmetric])
1596 apply (erule_tac x = "%z. if z = x then y else f z" in allE)
1599 apply (case_tac "xa = x")
1600 apply (drule_tac [3] x = x in fun_cong, simp_all)
1603 lemma mk_left_commute:
1604 fixes f (infix "\<otimes>" 60)
1605 assumes a: "\<And>x y z. (x \<otimes> y) \<otimes> z = x \<otimes> (y \<otimes> z)" and
1606 c: "\<And>x y. x \<otimes> y = y \<otimes> x"
1607 shows "x \<otimes> (y \<otimes> z) = y \<otimes> (x \<otimes> z)"
1608 by (rule trans [OF trans [OF c a] arg_cong [OF c, of "f y"]])
1610 lemmas eq_sym_conv = eq_commute
1613 "(\<not>(P \<and> Q)) = (\<not> P \<or> \<not> Q)" "(\<not> (P \<or> Q)) = (\<not> P \<and> \<not>Q)" "(P \<longrightarrow> Q) = (\<not>P \<or> Q)"
1614 "(P = Q) = ((P \<and> Q) \<or> (\<not>P \<and> \<not> Q))" "(\<not>(P = Q)) = ((P \<and> \<not> Q) \<or> (\<not>P \<and> Q))"
1615 "(\<not> \<not>(P)) = P"
1619 subsection {* Basic ML bindings *}
1622 val FalseE = @{thm FalseE}
1623 val Let_def = @{thm Let_def}
1624 val TrueI = @{thm TrueI}
1625 val allE = @{thm allE}
1626 val allI = @{thm allI}
1627 val all_dupE = @{thm all_dupE}
1628 val arg_cong = @{thm arg_cong}
1629 val box_equals = @{thm box_equals}
1630 val ccontr = @{thm ccontr}
1631 val classical = @{thm classical}
1632 val conjE = @{thm conjE}
1633 val conjI = @{thm conjI}
1634 val conjunct1 = @{thm conjunct1}
1635 val conjunct2 = @{thm conjunct2}
1636 val disjCI = @{thm disjCI}
1637 val disjE = @{thm disjE}
1638 val disjI1 = @{thm disjI1}
1639 val disjI2 = @{thm disjI2}
1640 val eq_reflection = @{thm eq_reflection}
1641 val ex1E = @{thm ex1E}
1642 val ex1I = @{thm ex1I}
1643 val ex1_implies_ex = @{thm ex1_implies_ex}
1644 val exE = @{thm exE}
1645 val exI = @{thm exI}
1646 val excluded_middle = @{thm excluded_middle}
1647 val ext = @{thm ext}
1648 val fun_cong = @{thm fun_cong}
1649 val iffD1 = @{thm iffD1}
1650 val iffD2 = @{thm iffD2}
1651 val iffI = @{thm iffI}
1652 val impE = @{thm impE}
1653 val impI = @{thm impI}
1654 val meta_eq_to_obj_eq = @{thm meta_eq_to_obj_eq}
1656 val notE = @{thm notE}
1657 val notI = @{thm notI}
1658 val not_all = @{thm not_all}
1659 val not_ex = @{thm not_ex}
1660 val not_iff = @{thm not_iff}
1661 val not_not = @{thm not_not}
1662 val not_sym = @{thm not_sym}
1663 val refl = @{thm refl}
1664 val rev_mp = @{thm rev_mp}
1665 val spec = @{thm spec}
1666 val ssubst = @{thm ssubst}
1667 val subst = @{thm subst}
1668 val sym = @{thm sym}
1669 val trans = @{thm trans}
1673 subsection {* Code generator basics -- see further theory @{text "Code_Setup"} *}
1678 fixes eq :: "'a \<Rightarrow> 'a \<Rightarrow> bool"
1679 assumes eq_equals: "eq x y \<longleftrightarrow> x = y"
1682 lemma eq: "eq = (op =)"
1683 by (rule ext eq_equals)+
1685 lemma eq_refl: "eq x x \<longleftrightarrow> True"
1686 unfolding eq by rule+
1690 text {* Module setup *}
1692 use "~~/src/HOL/Tools/recfun_codegen.ML"
1696 #> Code_Haskell.setup
1699 #> RecfunCodegen.setup
1703 subsection {* Legacy tactics and ML bindings *}
1706 fun strip_tac i = REPEAT (resolve_tac [impI, allI] i);
1708 (* combination of (spec RS spec RS ...(j times) ... spec RS mp) *)
1710 fun wrong_prem (Const ("All", _) $ (Abs (_, _, t))) = wrong_prem t
1711 | wrong_prem (Bound _) = true
1712 | wrong_prem _ = false;
1713 val filter_right = filter (not o wrong_prem o HOLogic.dest_Trueprop o hd o Thm.prems_of);
1715 fun smp i = funpow i (fn m => filter_right ([spec] RL m)) ([mp]);
1716 fun smp_tac j = EVERY'[dresolve_tac (smp j), atac];
1719 val all_conj_distrib = thm "all_conj_distrib";
1720 val all_simps = thms "all_simps";
1721 val atomize_not = thm "atomize_not";
1722 val case_split = thm "case_split";
1723 val cases_simp = thm "cases_simp";
1724 val choice_eq = thm "choice_eq"
1725 val cong = thm "cong"
1726 val conj_comms = thms "conj_comms";
1727 val conj_cong = thm "conj_cong";
1728 val de_Morgan_conj = thm "de_Morgan_conj";
1729 val de_Morgan_disj = thm "de_Morgan_disj";
1730 val disj_assoc = thm "disj_assoc";
1731 val disj_comms = thms "disj_comms";
1732 val disj_cong = thm "disj_cong";
1733 val eq_ac = thms "eq_ac";
1734 val eq_cong2 = thm "eq_cong2"
1735 val Eq_FalseI = thm "Eq_FalseI";
1736 val Eq_TrueI = thm "Eq_TrueI";
1737 val Ex1_def = thm "Ex1_def"
1738 val ex_disj_distrib = thm "ex_disj_distrib";
1739 val ex_simps = thms "ex_simps";
1740 val if_cancel = thm "if_cancel";
1741 val if_eq_cancel = thm "if_eq_cancel";
1742 val if_False = thm "if_False";
1743 val iff_conv_conj_imp = thm "iff_conv_conj_imp";
1745 val if_splits = thms "if_splits";
1746 val if_True = thm "if_True";
1747 val if_weak_cong = thm "if_weak_cong"
1748 val imp_all = thm "imp_all";
1749 val imp_cong = thm "imp_cong";
1750 val imp_conjL = thm "imp_conjL";
1751 val imp_conjR = thm "imp_conjR";
1752 val imp_conv_disj = thm "imp_conv_disj";
1753 val simp_implies_def = thm "simp_implies_def";
1754 val simp_thms = thms "simp_thms";
1755 val split_if = thm "split_if";
1756 val the1_equality = thm "the1_equality"
1757 val theI = thm "theI"
1758 val theI' = thm "theI'"
1759 val True_implies_equals = thm "True_implies_equals";
1760 val nnf_conv = Simplifier.rewrite (HOL_basic_ss addsimps simp_thms @ @{thms "nnf_simps"})