author | wenzelm |
Tue, 07 Nov 2006 19:40:13 +0100 | |
changeset 21233 | 5a5c8ea5f66a |
parent 16417 | 9bc16273c2d4 |
child 21404 | eb85850d3eb7 |
permissions | -rw-r--r-- |
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(* Title: ZF/Constructible/Formula.thy |
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ID: $Id$ |
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Author: Lawrence C Paulson, Cambridge University Computer Laboratory |
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*) |
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header {* First-Order Formulas and the Definition of the Class L *} |
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theory Formula imports Main begin |
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subsection{*Internalized formulas of FOL*} |
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text{*De Bruijn representation. |
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Unbound variables get their denotations from an environment.*} |
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consts formula :: i |
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datatype |
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"formula" = Member ("x: nat", "y: nat") |
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| Equal ("x: nat", "y: nat") |
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| Nand ("p: formula", "q: formula") |
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| Forall ("p: formula") |
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declare formula.intros [TC] |
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definition Neg :: "i=>i" |
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"Neg(p) == Nand(p,p)" |
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definition And :: "[i,i]=>i" |
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"And(p,q) == Neg(Nand(p,q))" |
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definition Or :: "[i,i]=>i" |
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"Or(p,q) == Nand(Neg(p),Neg(q))" |
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definition Implies :: "[i,i]=>i" |
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"Implies(p,q) == Nand(p,Neg(q))" |
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definition Iff :: "[i,i]=>i" |
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"Iff(p,q) == And(Implies(p,q), Implies(q,p))" |
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definition Exists :: "i=>i" |
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"Exists(p) == Neg(Forall(Neg(p)))"; |
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lemma Neg_type [TC]: "p \<in> formula ==> Neg(p) \<in> formula" |
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by (simp add: Neg_def) |
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lemma And_type [TC]: "[| p \<in> formula; q \<in> formula |] ==> And(p,q) \<in> formula" |
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by (simp add: And_def) |
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lemma Or_type [TC]: "[| p \<in> formula; q \<in> formula |] ==> Or(p,q) \<in> formula" |
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by (simp add: Or_def) |
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lemma Implies_type [TC]: |
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"[| p \<in> formula; q \<in> formula |] ==> Implies(p,q) \<in> formula" |
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by (simp add: Implies_def) |
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lemma Iff_type [TC]: |
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"[| p \<in> formula; q \<in> formula |] ==> Iff(p,q) \<in> formula" |
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by (simp add: Iff_def) |
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lemma Exists_type [TC]: "p \<in> formula ==> Exists(p) \<in> formula" |
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by (simp add: Exists_def) |
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consts satisfies :: "[i,i]=>i" |
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primrec (*explicit lambda is required because the environment varies*) |
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"satisfies(A,Member(x,y)) = |
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(\<lambda>env \<in> list(A). bool_of_o (nth(x,env) \<in> nth(y,env)))" |
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"satisfies(A,Equal(x,y)) = |
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(\<lambda>env \<in> list(A). bool_of_o (nth(x,env) = nth(y,env)))" |
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"satisfies(A,Nand(p,q)) = |
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(\<lambda>env \<in> list(A). not ((satisfies(A,p)`env) and (satisfies(A,q)`env)))" |
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"satisfies(A,Forall(p)) = |
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(\<lambda>env \<in> list(A). bool_of_o (\<forall>x\<in>A. satisfies(A,p) ` (Cons(x,env)) = 1))" |
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lemma "p \<in> formula ==> satisfies(A,p) \<in> list(A) -> bool" |
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by (induct set: formula) simp_all |
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abbreviation |
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sats :: "[i,i,i] => o" |
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"sats(A,p,env) == satisfies(A,p)`env = 1" |
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lemma [simp]: |
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"env \<in> list(A) |
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==> sats(A, Member(x,y), env) <-> nth(x,env) \<in> nth(y,env)" |
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by simp |
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lemma [simp]: |
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"env \<in> list(A) |
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==> sats(A, Equal(x,y), env) <-> nth(x,env) = nth(y,env)" |
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by simp |
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lemma sats_Nand_iff [simp]: |
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"env \<in> list(A) |
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==> (sats(A, Nand(p,q), env)) <-> ~ (sats(A,p,env) & sats(A,q,env))" |
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by (simp add: Bool.and_def Bool.not_def cond_def) |
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lemma sats_Forall_iff [simp]: |
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"env \<in> list(A) |
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==> sats(A, Forall(p), env) <-> (\<forall>x\<in>A. sats(A, p, Cons(x,env)))" |
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by simp |
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declare satisfies.simps [simp del]; |
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subsection{*Dividing line between primitive and derived connectives*} |
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lemma sats_Neg_iff [simp]: |
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"env \<in> list(A) |
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==> sats(A, Neg(p), env) <-> ~ sats(A,p,env)" |
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by (simp add: Neg_def) |
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lemma sats_And_iff [simp]: |
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"env \<in> list(A) |
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==> (sats(A, And(p,q), env)) <-> sats(A,p,env) & sats(A,q,env)" |
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by (simp add: And_def) |
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lemma sats_Or_iff [simp]: |
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"env \<in> list(A) |
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==> (sats(A, Or(p,q), env)) <-> sats(A,p,env) | sats(A,q,env)" |
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by (simp add: Or_def) |
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lemma sats_Implies_iff [simp]: |
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"env \<in> list(A) |
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==> (sats(A, Implies(p,q), env)) <-> (sats(A,p,env) --> sats(A,q,env))" |
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by (simp add: Implies_def, blast) |
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lemma sats_Iff_iff [simp]: |
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"env \<in> list(A) |
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==> (sats(A, Iff(p,q), env)) <-> (sats(A,p,env) <-> sats(A,q,env))" |
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by (simp add: Iff_def, blast) |
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lemma sats_Exists_iff [simp]: |
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"env \<in> list(A) |
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==> sats(A, Exists(p), env) <-> (\<exists>x\<in>A. sats(A, p, Cons(x,env)))" |
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by (simp add: Exists_def) |
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subsubsection{*Derived rules to help build up formulas*} |
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lemma mem_iff_sats: |
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"[| nth(i,env) = x; nth(j,env) = y; env \<in> list(A)|] |
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==> (x\<in>y) <-> sats(A, Member(i,j), env)" |
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by (simp add: satisfies.simps) |
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lemma equal_iff_sats: |
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"[| nth(i,env) = x; nth(j,env) = y; env \<in> list(A)|] |
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==> (x=y) <-> sats(A, Equal(i,j), env)" |
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by (simp add: satisfies.simps) |
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lemma not_iff_sats: |
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"[| P <-> sats(A,p,env); env \<in> list(A)|] |
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==> (~P) <-> sats(A, Neg(p), env)" |
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by simp |
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lemma conj_iff_sats: |
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"[| P <-> sats(A,p,env); Q <-> sats(A,q,env); env \<in> list(A)|] |
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==> (P & Q) <-> sats(A, And(p,q), env)" |
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by (simp add: sats_And_iff) |
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lemma disj_iff_sats: |
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"[| P <-> sats(A,p,env); Q <-> sats(A,q,env); env \<in> list(A)|] |
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==> (P | Q) <-> sats(A, Or(p,q), env)" |
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by (simp add: sats_Or_iff) |
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lemma iff_iff_sats: |
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"[| P <-> sats(A,p,env); Q <-> sats(A,q,env); env \<in> list(A)|] |
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==> (P <-> Q) <-> sats(A, Iff(p,q), env)" |
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by (simp add: sats_Forall_iff) |
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lemma imp_iff_sats: |
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"[| P <-> sats(A,p,env); Q <-> sats(A,q,env); env \<in> list(A)|] |
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==> (P --> Q) <-> sats(A, Implies(p,q), env)" |
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by (simp add: sats_Forall_iff) |
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lemma ball_iff_sats: |
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"[| !!x. x\<in>A ==> P(x) <-> sats(A, p, Cons(x, env)); env \<in> list(A)|] |
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==> (\<forall>x\<in>A. P(x)) <-> sats(A, Forall(p), env)" |
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by (simp add: sats_Forall_iff) |
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lemma bex_iff_sats: |
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"[| !!x. x\<in>A ==> P(x) <-> sats(A, p, Cons(x, env)); env \<in> list(A)|] |
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==> (\<exists>x\<in>A. P(x)) <-> sats(A, Exists(p), env)" |
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by (simp add: sats_Exists_iff) |
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lemmas FOL_iff_sats = |
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mem_iff_sats equal_iff_sats not_iff_sats conj_iff_sats |
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disj_iff_sats imp_iff_sats iff_iff_sats imp_iff_sats ball_iff_sats |
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bex_iff_sats |
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subsection{*Arity of a Formula: Maximum Free de Bruijn Index*} |
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consts arity :: "i=>i" |
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primrec |
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"arity(Member(x,y)) = succ(x) \<union> succ(y)" |
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"arity(Equal(x,y)) = succ(x) \<union> succ(y)" |
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"arity(Nand(p,q)) = arity(p) \<union> arity(q)" |
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"arity(Forall(p)) = Arith.pred(arity(p))" |
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lemma arity_type [TC]: "p \<in> formula ==> arity(p) \<in> nat" |
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by (induct_tac p, simp_all) |
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lemma arity_Neg [simp]: "arity(Neg(p)) = arity(p)" |
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by (simp add: Neg_def) |
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lemma arity_And [simp]: "arity(And(p,q)) = arity(p) \<union> arity(q)" |
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by (simp add: And_def) |
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lemma arity_Or [simp]: "arity(Or(p,q)) = arity(p) \<union> arity(q)" |
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by (simp add: Or_def) |
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lemma arity_Implies [simp]: "arity(Implies(p,q)) = arity(p) \<union> arity(q)" |
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by (simp add: Implies_def) |
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lemma arity_Iff [simp]: "arity(Iff(p,q)) = arity(p) \<union> arity(q)" |
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by (simp add: Iff_def, blast) |
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lemma arity_Exists [simp]: "arity(Exists(p)) = Arith.pred(arity(p))" |
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by (simp add: Exists_def) |
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lemma arity_sats_iff [rule_format]: |
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"[| p \<in> formula; extra \<in> list(A) |] |
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==> \<forall>env \<in> list(A). |
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arity(p) \<le> length(env) --> |
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sats(A, p, env @ extra) <-> sats(A, p, env)" |
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apply (induct_tac p) |
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apply (simp_all add: Arith.pred_def nth_append Un_least_lt_iff nat_imp_quasinat |
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split: split_nat_case, auto) |
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done |
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lemma arity_sats1_iff: |
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"[| arity(p) \<le> succ(length(env)); p \<in> formula; x \<in> A; env \<in> list(A); |
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extra \<in> list(A) |] |
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==> sats(A, p, Cons(x, env @ extra)) <-> sats(A, p, Cons(x, env))" |
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apply (insert arity_sats_iff [of p extra A "Cons(x,env)"]) |
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apply simp |
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done |
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subsection{*Renaming Some de Bruijn Variables*} |
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definition incr_var :: "[i,i]=>i" |
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"incr_var(x,nq) == if x<nq then x else succ(x)" |
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lemma incr_var_lt: "x<nq ==> incr_var(x,nq) = x" |
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by (simp add: incr_var_def) |
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lemma incr_var_le: "nq\<le>x ==> incr_var(x,nq) = succ(x)" |
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apply (simp add: incr_var_def) |
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apply (blast dest: lt_trans1) |
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done |
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consts incr_bv :: "i=>i" |
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primrec |
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"incr_bv(Member(x,y)) = |
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(\<lambda>nq \<in> nat. Member (incr_var(x,nq), incr_var(y,nq)))" |
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"incr_bv(Equal(x,y)) = |
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(\<lambda>nq \<in> nat. Equal (incr_var(x,nq), incr_var(y,nq)))" |
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"incr_bv(Nand(p,q)) = |
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(\<lambda>nq \<in> nat. Nand (incr_bv(p)`nq, incr_bv(q)`nq))" |
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"incr_bv(Forall(p)) = |
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(\<lambda>nq \<in> nat. Forall (incr_bv(p) ` succ(nq)))" |
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lemma [TC]: "x \<in> nat ==> incr_var(x,nq) \<in> nat" |
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by (simp add: incr_var_def) |
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lemma incr_bv_type [TC]: "p \<in> formula ==> incr_bv(p) \<in> nat -> formula" |
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by (induct_tac p, simp_all) |
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text{*Obviously, @{term DPow} is closed under complements and finite |
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intersections and unions. Needs an inductive lemma to allow two lists of |
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parameters to be combined.*} |
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lemma sats_incr_bv_iff [rule_format]: |
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"[| p \<in> formula; env \<in> list(A); x \<in> A |] |
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==> \<forall>bvs \<in> list(A). |
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sats(A, incr_bv(p) ` length(bvs), bvs @ Cons(x,env)) <-> |
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sats(A, p, bvs@env)" |
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apply (induct_tac p) |
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apply (simp_all add: incr_var_def nth_append succ_lt_iff length_type) |
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apply (auto simp add: diff_succ not_lt_iff_le) |
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done |
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(*the following two lemmas prevent huge case splits in arity_incr_bv_lemma*) |
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lemma incr_var_lemma: |
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"[| x \<in> nat; y \<in> nat; nq \<le> x |] |
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==> succ(x) \<union> incr_var(y,nq) = succ(x \<union> y)" |
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apply (simp add: incr_var_def Ord_Un_if, auto) |
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apply (blast intro: leI) |
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apply (simp add: not_lt_iff_le) |
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apply (blast intro: le_anti_sym) |
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apply (blast dest: lt_trans2) |
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done |
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lemma incr_And_lemma: |
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"y < x ==> y \<union> succ(x) = succ(x \<union> y)" |
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apply (simp add: Ord_Un_if lt_Ord lt_Ord2 succ_lt_iff) |
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apply (blast dest: lt_asym) |
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done |
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lemma arity_incr_bv_lemma [rule_format]: |
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"p \<in> formula |
|
315 |
==> \<forall>n \<in> nat. arity (incr_bv(p) ` n) = |
|
316 |
(if n < arity(p) then succ(arity(p)) else arity(p))" |
|
317 |
apply (induct_tac p) |
|
318 |
apply (simp_all add: imp_disj not_lt_iff_le Un_least_lt_iff lt_Un_iff le_Un_iff |
|
319 |
succ_Un_distrib [symmetric] incr_var_lt incr_var_le |
|
13647 | 320 |
Un_commute incr_var_lemma Arith.pred_def nat_imp_quasinat |
13269 | 321 |
split: split_nat_case) |
322 |
txt{*the Forall case reduces to linear arithmetic*} |
|
323 |
prefer 2 |
|
324 |
apply clarify |
|
325 |
apply (blast dest: lt_trans1) |
|
326 |
txt{*left with the And case*} |
|
13223 | 327 |
apply safe |
328 |
apply (blast intro: incr_And_lemma lt_trans1) |
|
329 |
apply (subst incr_And_lemma) |
|
13269 | 330 |
apply (blast intro: lt_trans1) |
331 |
apply (simp add: Un_commute) |
|
13223 | 332 |
done |
333 |
||
334 |
||
13647 | 335 |
subsection{*Renaming all but the First de Bruijn Variable*} |
13223 | 336 |
|
21233 | 337 |
definition incr_bv1 :: "i => i" |
13223 | 338 |
"incr_bv1(p) == incr_bv(p)`1" |
339 |
||
340 |
||
341 |
lemma incr_bv1_type [TC]: "p \<in> formula ==> incr_bv1(p) \<in> formula" |
|
342 |
by (simp add: incr_bv1_def) |
|
343 |
||
344 |
(*For renaming all but the bound variable at level 0*) |
|
13647 | 345 |
lemma sats_incr_bv1_iff: |
13223 | 346 |
"[| p \<in> formula; env \<in> list(A); x \<in> A; y \<in> A |] |
347 |
==> sats(A, incr_bv1(p), Cons(x, Cons(y, env))) <-> |
|
348 |
sats(A, p, Cons(x,env))" |
|
349 |
apply (insert sats_incr_bv_iff [of p env A y "Cons(x,Nil)"]) |
|
350 |
apply (simp add: incr_bv1_def) |
|
351 |
done |
|
352 |
||
353 |
lemma formula_add_params1 [rule_format]: |
|
354 |
"[| p \<in> formula; n \<in> nat; x \<in> A |] |
|
355 |
==> \<forall>bvs \<in> list(A). \<forall>env \<in> list(A). |
|
356 |
length(bvs) = n --> |
|
357 |
sats(A, iterates(incr_bv1, n, p), Cons(x, bvs@env)) <-> |
|
358 |
sats(A, p, Cons(x,env))" |
|
359 |
apply (induct_tac n, simp, clarify) |
|
360 |
apply (erule list.cases) |
|
361 |
apply (simp_all add: sats_incr_bv1_iff) |
|
362 |
done |
|
363 |
||
364 |
||
365 |
lemma arity_incr_bv1_eq: |
|
366 |
"p \<in> formula |
|
367 |
==> arity(incr_bv1(p)) = |
|
368 |
(if 1 < arity(p) then succ(arity(p)) else arity(p))" |
|
369 |
apply (insert arity_incr_bv_lemma [of p 1]) |
|
370 |
apply (simp add: incr_bv1_def) |
|
371 |
done |
|
372 |
||
373 |
lemma arity_iterates_incr_bv1_eq: |
|
374 |
"[| p \<in> formula; n \<in> nat |] |
|
375 |
==> arity(incr_bv1^n(p)) = |
|
376 |
(if 1 < arity(p) then n #+ arity(p) else arity(p))" |
|
377 |
apply (induct_tac n) |
|
13298 | 378 |
apply (simp_all add: arity_incr_bv1_eq) |
13223 | 379 |
apply (simp add: not_lt_iff_le) |
380 |
apply (blast intro: le_trans add_le_self2 arity_type) |
|
381 |
done |
|
382 |
||
383 |
||
13647 | 384 |
|
385 |
subsection{*Definable Powerset*} |
|
386 |
||
387 |
text{*The definable powerset operation: Kunen's definition VI 1.1, page 165.*} |
|
21233 | 388 |
definition DPow :: "i => i" |
13223 | 389 |
"DPow(A) == {X \<in> Pow(A). |
390 |
\<exists>env \<in> list(A). \<exists>p \<in> formula. |
|
391 |
arity(p) \<le> succ(length(env)) & |
|
392 |
X = {x\<in>A. sats(A, p, Cons(x,env))}}" |
|
393 |
||
394 |
lemma DPowI: |
|
13291 | 395 |
"[|env \<in> list(A); p \<in> formula; arity(p) \<le> succ(length(env))|] |
13223 | 396 |
==> {x\<in>A. sats(A, p, Cons(x,env))} \<in> DPow(A)" |
397 |
by (simp add: DPow_def, blast) |
|
398 |
||
13291 | 399 |
text{*With this rule we can specify @{term p} later.*} |
400 |
lemma DPowI2 [rule_format]: |
|
401 |
"[|\<forall>x\<in>A. P(x) <-> sats(A, p, Cons(x,env)); |
|
402 |
env \<in> list(A); p \<in> formula; arity(p) \<le> succ(length(env))|] |
|
403 |
==> {x\<in>A. P(x)} \<in> DPow(A)" |
|
404 |
by (simp add: DPow_def, blast) |
|
405 |
||
13223 | 406 |
lemma DPowD: |
407 |
"X \<in> DPow(A) |
|
408 |
==> X <= A & |
|
409 |
(\<exists>env \<in> list(A). |
|
410 |
\<exists>p \<in> formula. arity(p) \<le> succ(length(env)) & |
|
411 |
X = {x\<in>A. sats(A, p, Cons(x,env))})" |
|
412 |
by (simp add: DPow_def) |
|
413 |
||
414 |
lemmas DPow_imp_subset = DPowD [THEN conjunct1] |
|
415 |
||
13647 | 416 |
(*Kunen's Lemma VI 1.2*) |
13223 | 417 |
lemma "[| p \<in> formula; env \<in> list(A); arity(p) \<le> succ(length(env)) |] |
418 |
==> {x\<in>A. sats(A, p, Cons(x,env))} \<in> DPow(A)" |
|
419 |
by (blast intro: DPowI) |
|
420 |
||
421 |
lemma DPow_subset_Pow: "DPow(A) <= Pow(A)" |
|
422 |
by (simp add: DPow_def, blast) |
|
423 |
||
424 |
lemma empty_in_DPow: "0 \<in> DPow(A)" |
|
425 |
apply (simp add: DPow_def) |
|
13339
0f89104dd377
Fixed quantified variable name preservation for ball and bex (bounded quants)
paulson
parents:
13328
diff
changeset
|
426 |
apply (rule_tac x=Nil in bexI) |
13223 | 427 |
apply (rule_tac x="Neg(Equal(0,0))" in bexI) |
428 |
apply (auto simp add: Un_least_lt_iff) |
|
429 |
done |
|
430 |
||
431 |
lemma Compl_in_DPow: "X \<in> DPow(A) ==> (A-X) \<in> DPow(A)" |
|
432 |
apply (simp add: DPow_def, clarify, auto) |
|
433 |
apply (rule bexI) |
|
434 |
apply (rule_tac x="Neg(p)" in bexI) |
|
435 |
apply auto |
|
436 |
done |
|
437 |
||
438 |
lemma Int_in_DPow: "[| X \<in> DPow(A); Y \<in> DPow(A) |] ==> X Int Y \<in> DPow(A)" |
|
439 |
apply (simp add: DPow_def, auto) |
|
440 |
apply (rename_tac envp p envq q) |
|
441 |
apply (rule_tac x="envp@envq" in bexI) |
|
442 |
apply (rule_tac x="And(p, iterates(incr_bv1,length(envp),q))" in bexI) |
|
443 |
apply typecheck |
|
444 |
apply (rule conjI) |
|
445 |
(*finally check the arity!*) |
|
446 |
apply (simp add: arity_iterates_incr_bv1_eq length_app Un_least_lt_iff) |
|
447 |
apply (force intro: add_le_self le_trans) |
|
448 |
apply (simp add: arity_sats1_iff formula_add_params1, blast) |
|
449 |
done |
|
450 |
||
451 |
lemma Un_in_DPow: "[| X \<in> DPow(A); Y \<in> DPow(A) |] ==> X Un Y \<in> DPow(A)" |
|
452 |
apply (subgoal_tac "X Un Y = A - ((A-X) Int (A-Y))") |
|
453 |
apply (simp add: Int_in_DPow Compl_in_DPow) |
|
454 |
apply (simp add: DPow_def, blast) |
|
455 |
done |
|
456 |
||
13651
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
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diff
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|
457 |
lemma singleton_in_DPow: "a \<in> A ==> {a} \<in> DPow(A)" |
13223 | 458 |
apply (simp add: DPow_def) |
13651
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
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diff
changeset
|
459 |
apply (rule_tac x="Cons(a,Nil)" in bexI) |
13223 | 460 |
apply (rule_tac x="Equal(0,1)" in bexI) |
461 |
apply typecheck |
|
462 |
apply (force simp add: succ_Un_distrib [symmetric]) |
|
463 |
done |
|
464 |
||
465 |
lemma cons_in_DPow: "[| a \<in> A; X \<in> DPow(A) |] ==> cons(a,X) \<in> DPow(A)" |
|
466 |
apply (rule cons_eq [THEN subst]) |
|
467 |
apply (blast intro: singleton_in_DPow Un_in_DPow) |
|
468 |
done |
|
469 |
||
470 |
(*Part of Lemma 1.3*) |
|
471 |
lemma Fin_into_DPow: "X \<in> Fin(A) ==> X \<in> DPow(A)" |
|
472 |
apply (erule Fin.induct) |
|
473 |
apply (rule empty_in_DPow) |
|
474 |
apply (blast intro: cons_in_DPow) |
|
475 |
done |
|
476 |
||
13651
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Cosmetic changes suggested by writing the paper. Deleted some
paulson
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13647
diff
changeset
|
477 |
text{*@{term DPow} is not monotonic. For example, let @{term A} be some |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
478 |
non-constructible set of natural numbers, and let @{term B} be @{term nat}. |
13721 | 479 |
Then @{term "A<=B"} and obviously @{term "A \<in> DPow(A)"} but @{term "A ~: |
13651
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
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13647
diff
changeset
|
480 |
DPow(B)"}.*} |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
481 |
|
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
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|
482 |
(*This may be true but the proof looks difficult, requiring relativization |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
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changeset
|
483 |
lemma DPow_insert: "DPow (cons(a,A)) = DPow(A) Un {cons(a,X) . X: DPow(A)}" |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
484 |
apply (rule equalityI, safe) |
13223 | 485 |
oops |
13651
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
486 |
*) |
13223 | 487 |
|
488 |
lemma Finite_Pow_subset_Pow: "Finite(A) ==> Pow(A) <= DPow(A)" |
|
489 |
by (blast intro: Fin_into_DPow Finite_into_Fin Fin_subset) |
|
490 |
||
491 |
lemma Finite_DPow_eq_Pow: "Finite(A) ==> DPow(A) = Pow(A)" |
|
492 |
apply (rule equalityI) |
|
493 |
apply (rule DPow_subset_Pow) |
|
494 |
apply (erule Finite_Pow_subset_Pow) |
|
495 |
done |
|
496 |
||
13651
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
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diff
changeset
|
497 |
|
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
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changeset
|
498 |
subsection{*Internalized Formulas for the Ordinals*} |
13223 | 499 |
|
13651
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Cosmetic changes suggested by writing the paper. Deleted some
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|
500 |
text{*The @{text sats} theorems below differ from the usual form in that they |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
501 |
include an element of absoluteness. That is, they relate internalized |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
502 |
formulas to real concepts such as the subset relation, rather than to the |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
503 |
relativized concepts defined in theory @{text Relative}. This lets us prove |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
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13647
diff
changeset
|
504 |
the theorem as @{text Ords_in_DPow} without first having to instantiate the |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
505 |
locale @{text M_trivial}. Note that the present theory does not even take |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
506 |
@{text Relative} as a parent.*} |
13298 | 507 |
|
508 |
subsubsection{*The subset relation*} |
|
509 |
||
21233 | 510 |
definition subset_fm :: "[i,i]=>i" |
13298 | 511 |
"subset_fm(x,y) == Forall(Implies(Member(0,succ(x)), Member(0,succ(y))))" |
512 |
||
513 |
lemma subset_type [TC]: "[| x \<in> nat; y \<in> nat |] ==> subset_fm(x,y) \<in> formula" |
|
514 |
by (simp add: subset_fm_def) |
|
515 |
||
516 |
lemma arity_subset_fm [simp]: |
|
517 |
"[| x \<in> nat; y \<in> nat |] ==> arity(subset_fm(x,y)) = succ(x) \<union> succ(y)" |
|
518 |
by (simp add: subset_fm_def succ_Un_distrib [symmetric]) |
|
519 |
||
520 |
lemma sats_subset_fm [simp]: |
|
521 |
"[|x < length(env); y \<in> nat; env \<in> list(A); Transset(A)|] |
|
522 |
==> sats(A, subset_fm(x,y), env) <-> nth(x,env) \<subseteq> nth(y,env)" |
|
523 |
apply (frule lt_length_in_nat, assumption) |
|
524 |
apply (simp add: subset_fm_def Transset_def) |
|
525 |
apply (blast intro: nth_type) |
|
526 |
done |
|
527 |
||
528 |
subsubsection{*Transitive sets*} |
|
529 |
||
21233 | 530 |
definition transset_fm :: "i=>i" |
13298 | 531 |
"transset_fm(x) == Forall(Implies(Member(0,succ(x)), subset_fm(0,succ(x))))" |
532 |
||
533 |
lemma transset_type [TC]: "x \<in> nat ==> transset_fm(x) \<in> formula" |
|
534 |
by (simp add: transset_fm_def) |
|
535 |
||
536 |
lemma arity_transset_fm [simp]: |
|
537 |
"x \<in> nat ==> arity(transset_fm(x)) = succ(x)" |
|
538 |
by (simp add: transset_fm_def succ_Un_distrib [symmetric]) |
|
539 |
||
540 |
lemma sats_transset_fm [simp]: |
|
541 |
"[|x < length(env); env \<in> list(A); Transset(A)|] |
|
542 |
==> sats(A, transset_fm(x), env) <-> Transset(nth(x,env))" |
|
543 |
apply (frule lt_nat_in_nat, erule length_type) |
|
544 |
apply (simp add: transset_fm_def Transset_def) |
|
545 |
apply (blast intro: nth_type) |
|
546 |
done |
|
547 |
||
548 |
subsubsection{*Ordinals*} |
|
549 |
||
21233 | 550 |
definition ordinal_fm :: "i=>i" |
13298 | 551 |
"ordinal_fm(x) == |
552 |
And(transset_fm(x), Forall(Implies(Member(0,succ(x)), transset_fm(0))))" |
|
553 |
||
554 |
lemma ordinal_type [TC]: "x \<in> nat ==> ordinal_fm(x) \<in> formula" |
|
555 |
by (simp add: ordinal_fm_def) |
|
556 |
||
557 |
lemma arity_ordinal_fm [simp]: |
|
558 |
"x \<in> nat ==> arity(ordinal_fm(x)) = succ(x)" |
|
559 |
by (simp add: ordinal_fm_def succ_Un_distrib [symmetric]) |
|
560 |
||
13306 | 561 |
lemma sats_ordinal_fm: |
13298 | 562 |
"[|x < length(env); env \<in> list(A); Transset(A)|] |
563 |
==> sats(A, ordinal_fm(x), env) <-> Ord(nth(x,env))" |
|
564 |
apply (frule lt_nat_in_nat, erule length_type) |
|
565 |
apply (simp add: ordinal_fm_def Ord_def Transset_def) |
|
566 |
apply (blast intro: nth_type) |
|
567 |
done |
|
568 |
||
13651
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
569 |
text{*The subset consisting of the ordinals is definable. Essential lemma for |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
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parents:
13647
diff
changeset
|
570 |
@{text Ord_in_Lset}. This result is the objective of the present subsection.*} |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
571 |
theorem Ords_in_DPow: "Transset(A) ==> {x \<in> A. Ord(x)} \<in> DPow(A)" |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
572 |
apply (simp add: DPow_def Collect_subset) |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
573 |
apply (rule_tac x=Nil in bexI) |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
574 |
apply (rule_tac x="ordinal_fm(0)" in bexI) |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
575 |
apply (simp_all add: sats_ordinal_fm) |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
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13647
diff
changeset
|
576 |
done |
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Cosmetic changes suggested by writing the paper. Deleted some
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parents:
13647
diff
changeset
|
577 |
|
13298 | 578 |
|
13223 | 579 |
subsection{* Constant Lset: Levels of the Constructible Universe *} |
580 |
||
21233 | 581 |
definition |
13651
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
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diff
changeset
|
582 |
Lset :: "i=>i" |
13223 | 583 |
"Lset(i) == transrec(i, %x f. \<Union>y\<in>x. DPow(f`y))" |
584 |
||
13651
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Cosmetic changes suggested by writing the paper. Deleted some
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parents:
13647
diff
changeset
|
585 |
L :: "i=>o" --{*Kunen's definition VI 1.5, page 167*} |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
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parents:
13647
diff
changeset
|
586 |
"L(x) == \<exists>i. Ord(i) & x \<in> Lset(i)" |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
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parents:
13647
diff
changeset
|
587 |
|
13223 | 588 |
text{*NOT SUITABLE FOR REWRITING -- RECURSIVE!*} |
589 |
lemma Lset: "Lset(i) = (UN j:i. DPow(Lset(j)))" |
|
590 |
by (subst Lset_def [THEN def_transrec], simp) |
|
591 |
||
592 |
lemma LsetI: "[|y\<in>x; A \<in> DPow(Lset(y))|] ==> A \<in> Lset(x)"; |
|
593 |
by (subst Lset, blast) |
|
594 |
||
595 |
lemma LsetD: "A \<in> Lset(x) ==> \<exists>y\<in>x. A \<in> DPow(Lset(y))"; |
|
596 |
apply (insert Lset [of x]) |
|
597 |
apply (blast intro: elim: equalityE) |
|
598 |
done |
|
599 |
||
600 |
subsubsection{* Transitivity *} |
|
601 |
||
602 |
lemma elem_subset_in_DPow: "[|X \<in> A; X \<subseteq> A|] ==> X \<in> DPow(A)" |
|
603 |
apply (simp add: Transset_def DPow_def) |
|
604 |
apply (rule_tac x="[X]" in bexI) |
|
605 |
apply (rule_tac x="Member(0,1)" in bexI) |
|
606 |
apply (auto simp add: Un_least_lt_iff) |
|
607 |
done |
|
608 |
||
609 |
lemma Transset_subset_DPow: "Transset(A) ==> A <= DPow(A)" |
|
610 |
apply clarify |
|
611 |
apply (simp add: Transset_def) |
|
612 |
apply (blast intro: elem_subset_in_DPow) |
|
613 |
done |
|
614 |
||
615 |
lemma Transset_DPow: "Transset(A) ==> Transset(DPow(A))" |
|
616 |
apply (simp add: Transset_def) |
|
617 |
apply (blast intro: elem_subset_in_DPow dest: DPowD) |
|
618 |
done |
|
619 |
||
13651
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
620 |
text{*Kunen's VI 1.6 (a)*} |
13223 | 621 |
lemma Transset_Lset: "Transset(Lset(i))" |
622 |
apply (rule_tac a=i in eps_induct) |
|
623 |
apply (subst Lset) |
|
624 |
apply (blast intro!: Transset_Union_family Transset_Un Transset_DPow) |
|
625 |
done |
|
626 |
||
13291 | 627 |
lemma mem_Lset_imp_subset_Lset: "a \<in> Lset(i) ==> a \<subseteq> Lset(i)" |
628 |
apply (insert Transset_Lset) |
|
629 |
apply (simp add: Transset_def) |
|
630 |
done |
|
631 |
||
13223 | 632 |
subsubsection{* Monotonicity *} |
633 |
||
13651
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
634 |
text{*Kunen's VI 1.6 (b)*} |
13223 | 635 |
lemma Lset_mono [rule_format]: |
636 |
"ALL j. i<=j --> Lset(i) <= Lset(j)" |
|
15481 | 637 |
proof (induct i rule: eps_induct, intro allI impI) |
638 |
fix x j |
|
639 |
assume "\<forall>y\<in>x. \<forall>j. y \<subseteq> j \<longrightarrow> Lset(y) \<subseteq> Lset(j)" |
|
640 |
and "x \<subseteq> j" |
|
641 |
thus "Lset(x) \<subseteq> Lset(j)" |
|
642 |
by (force simp add: Lset [of x] Lset [of j]) |
|
643 |
qed |
|
13223 | 644 |
|
645 |
text{*This version lets us remove the premise @{term "Ord(i)"} sometimes.*} |
|
646 |
lemma Lset_mono_mem [rule_format]: |
|
647 |
"ALL j. i:j --> Lset(i) <= Lset(j)" |
|
15481 | 648 |
proof (induct i rule: eps_induct, intro allI impI) |
649 |
fix x j |
|
650 |
assume "\<forall>y\<in>x. \<forall>j. y \<in> j \<longrightarrow> Lset(y) \<subseteq> Lset(j)" |
|
651 |
and "x \<in> j" |
|
652 |
thus "Lset(x) \<subseteq> Lset(j)" |
|
653 |
by (force simp add: Lset [of j] |
|
654 |
intro!: bexI intro: elem_subset_in_DPow dest: LsetD DPowD) |
|
655 |
qed |
|
656 |
||
13223 | 657 |
|
13291 | 658 |
text{*Useful with Reflection to bump up the ordinal*} |
659 |
lemma subset_Lset_ltD: "[|A \<subseteq> Lset(i); i < j|] ==> A \<subseteq> Lset(j)" |
|
660 |
by (blast dest: ltD [THEN Lset_mono_mem]) |
|
661 |
||
13651
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
662 |
subsubsection{* 0, successor and limit equations for Lset *} |
13223 | 663 |
|
664 |
lemma Lset_0 [simp]: "Lset(0) = 0" |
|
665 |
by (subst Lset, blast) |
|
666 |
||
667 |
lemma Lset_succ_subset1: "DPow(Lset(i)) <= Lset(succ(i))" |
|
668 |
by (subst Lset, rule succI1 [THEN RepFunI, THEN Union_upper]) |
|
669 |
||
670 |
lemma Lset_succ_subset2: "Lset(succ(i)) <= DPow(Lset(i))" |
|
671 |
apply (subst Lset, rule UN_least) |
|
672 |
apply (erule succE) |
|
673 |
apply blast |
|
674 |
apply clarify |
|
675 |
apply (rule elem_subset_in_DPow) |
|
676 |
apply (subst Lset) |
|
677 |
apply blast |
|
678 |
apply (blast intro: dest: DPowD Lset_mono_mem) |
|
679 |
done |
|
680 |
||
681 |
lemma Lset_succ: "Lset(succ(i)) = DPow(Lset(i))" |
|
682 |
by (intro equalityI Lset_succ_subset1 Lset_succ_subset2) |
|
683 |
||
684 |
lemma Lset_Union [simp]: "Lset(\<Union>(X)) = (\<Union>y\<in>X. Lset(y))" |
|
685 |
apply (subst Lset) |
|
686 |
apply (rule equalityI) |
|
687 |
txt{*first inclusion*} |
|
688 |
apply (rule UN_least) |
|
689 |
apply (erule UnionE) |
|
690 |
apply (rule subset_trans) |
|
691 |
apply (erule_tac [2] UN_upper, subst Lset, erule UN_upper) |
|
692 |
txt{*opposite inclusion*} |
|
693 |
apply (rule UN_least) |
|
694 |
apply (subst Lset, blast) |
|
695 |
done |
|
696 |
||
697 |
subsubsection{* Lset applied to Limit ordinals *} |
|
698 |
||
699 |
lemma Limit_Lset_eq: |
|
700 |
"Limit(i) ==> Lset(i) = (\<Union>y\<in>i. Lset(y))" |
|
701 |
by (simp add: Lset_Union [symmetric] Limit_Union_eq) |
|
702 |
||
13721 | 703 |
lemma lt_LsetI: "[| a: Lset(j); j<i |] ==> a \<in> Lset(i)" |
13223 | 704 |
by (blast dest: Lset_mono [OF le_imp_subset [OF leI]]) |
705 |
||
706 |
lemma Limit_LsetE: |
|
707 |
"[| a: Lset(i); ~R ==> Limit(i); |
|
708 |
!!x. [| x<i; a: Lset(x) |] ==> R |
|
709 |
|] ==> R" |
|
710 |
apply (rule classical) |
|
711 |
apply (rule Limit_Lset_eq [THEN equalityD1, THEN subsetD, THEN UN_E]) |
|
712 |
prefer 2 apply assumption |
|
713 |
apply blast |
|
714 |
apply (blast intro: ltI Limit_is_Ord) |
|
715 |
done |
|
716 |
||
717 |
subsubsection{* Basic closure properties *} |
|
718 |
||
13721 | 719 |
lemma zero_in_Lset: "y:x ==> 0 \<in> Lset(x)" |
13223 | 720 |
by (subst Lset, blast intro: empty_in_DPow) |
721 |
||
722 |
lemma notin_Lset: "x \<notin> Lset(x)" |
|
723 |
apply (rule_tac a=x in eps_induct) |
|
724 |
apply (subst Lset) |
|
725 |
apply (blast dest: DPowD) |
|
726 |
done |
|
727 |
||
728 |
||
13651
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
729 |
subsection{*Constructible Ordinals: Kunen's VI 1.9 (b)*} |
13223 | 730 |
|
731 |
lemma Ords_of_Lset_eq: "Ord(i) ==> {x\<in>Lset(i). Ord(x)} = i" |
|
732 |
apply (erule trans_induct3) |
|
733 |
apply (simp_all add: Lset_succ Limit_Lset_eq Limit_Union_eq) |
|
734 |
txt{*The successor case remains.*} |
|
735 |
apply (rule equalityI) |
|
736 |
txt{*First inclusion*} |
|
737 |
apply clarify |
|
738 |
apply (erule Ord_linear_lt, assumption) |
|
739 |
apply (blast dest: DPow_imp_subset ltD notE [OF notin_Lset]) |
|
740 |
apply blast |
|
741 |
apply (blast dest: ltD) |
|
742 |
txt{*Opposite inclusion, @{term "succ(x) \<subseteq> DPow(Lset(x)) \<inter> ON"}*} |
|
743 |
apply auto |
|
744 |
txt{*Key case: *} |
|
745 |
apply (erule subst, rule Ords_in_DPow [OF Transset_Lset]) |
|
746 |
apply (blast intro: elem_subset_in_DPow dest: OrdmemD elim: equalityE) |
|
747 |
apply (blast intro: Ord_in_Ord) |
|
748 |
done |
|
749 |
||
750 |
||
751 |
lemma Ord_subset_Lset: "Ord(i) ==> i \<subseteq> Lset(i)" |
|
752 |
by (subst Ords_of_Lset_eq [symmetric], assumption, fast) |
|
753 |
||
754 |
lemma Ord_in_Lset: "Ord(i) ==> i \<in> Lset(succ(i))" |
|
755 |
apply (simp add: Lset_succ) |
|
756 |
apply (subst Ords_of_Lset_eq [symmetric], assumption, |
|
757 |
rule Ords_in_DPow [OF Transset_Lset]) |
|
758 |
done |
|
759 |
||
13651
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
760 |
lemma Ord_in_L: "Ord(i) ==> L(i)" |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
761 |
by (simp add: L_def, blast intro: Ord_in_Lset) |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
762 |
|
13223 | 763 |
subsubsection{* Unions *} |
764 |
||
765 |
lemma Union_in_Lset: |
|
13687 | 766 |
"X \<in> Lset(i) ==> Union(X) \<in> Lset(succ(i))" |
13223 | 767 |
apply (insert Transset_Lset) |
768 |
apply (rule LsetI [OF succI1]) |
|
769 |
apply (simp add: Transset_def DPow_def) |
|
770 |
apply (intro conjI, blast) |
|
771 |
txt{*Now to create the formula @{term "\<exists>y. y \<in> X \<and> x \<in> y"} *} |
|
772 |
apply (rule_tac x="Cons(X,Nil)" in bexI) |
|
773 |
apply (rule_tac x="Exists(And(Member(0,2), Member(1,0)))" in bexI) |
|
774 |
apply typecheck |
|
775 |
apply (simp add: succ_Un_distrib [symmetric], blast) |
|
776 |
done |
|
777 |
||
13651
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
778 |
theorem Union_in_L: "L(X) ==> L(Union(X))" |
13687 | 779 |
by (simp add: L_def, blast dest: Union_in_Lset) |
13651
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
780 |
|
13223 | 781 |
subsubsection{* Finite sets and ordered pairs *} |
782 |
||
13721 | 783 |
lemma singleton_in_Lset: "a: Lset(i) ==> {a} \<in> Lset(succ(i))" |
13223 | 784 |
by (simp add: Lset_succ singleton_in_DPow) |
785 |
||
786 |
lemma doubleton_in_Lset: |
|
13721 | 787 |
"[| a: Lset(i); b: Lset(i) |] ==> {a,b} \<in> Lset(succ(i))" |
13223 | 788 |
by (simp add: Lset_succ empty_in_DPow cons_in_DPow) |
789 |
||
790 |
lemma Pair_in_Lset: |
|
13721 | 791 |
"[| a: Lset(i); b: Lset(i); Ord(i) |] ==> <a,b> \<in> Lset(succ(succ(i)))" |
13223 | 792 |
apply (unfold Pair_def) |
793 |
apply (blast intro: doubleton_in_Lset) |
|
794 |
done |
|
795 |
||
796 |
lemmas Lset_UnI1 = Un_upper1 [THEN Lset_mono [THEN subsetD], standard] |
|
797 |
lemmas Lset_UnI2 = Un_upper2 [THEN Lset_mono [THEN subsetD], standard] |
|
798 |
||
799 |
text{*Hard work is finding a single j:i such that {a,b}<=Lset(j)*} |
|
800 |
lemma doubleton_in_LLimit: |
|
13721 | 801 |
"[| a: Lset(i); b: Lset(i); Limit(i) |] ==> {a,b} \<in> Lset(i)" |
13223 | 802 |
apply (erule Limit_LsetE, assumption) |
803 |
apply (erule Limit_LsetE, assumption) |
|
13269 | 804 |
apply (blast intro: lt_LsetI [OF doubleton_in_Lset] |
805 |
Lset_UnI1 Lset_UnI2 Limit_has_succ Un_least_lt) |
|
13223 | 806 |
done |
807 |
||
13651
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
808 |
theorem doubleton_in_L: "[| L(a); L(b) |] ==> L({a, b})" |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
809 |
apply (simp add: L_def, clarify) |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
810 |
apply (drule Ord2_imp_greater_Limit, assumption) |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
811 |
apply (blast intro: lt_LsetI doubleton_in_LLimit Limit_is_Ord) |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
812 |
done |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
813 |
|
13223 | 814 |
lemma Pair_in_LLimit: |
13721 | 815 |
"[| a: Lset(i); b: Lset(i); Limit(i) |] ==> <a,b> \<in> Lset(i)" |
13223 | 816 |
txt{*Infer that a, b occur at ordinals x,xa < i.*} |
817 |
apply (erule Limit_LsetE, assumption) |
|
818 |
apply (erule Limit_LsetE, assumption) |
|
819 |
txt{*Infer that succ(succ(x Un xa)) < i *} |
|
820 |
apply (blast intro: lt_Ord lt_LsetI [OF Pair_in_Lset] |
|
821 |
Lset_UnI1 Lset_UnI2 Limit_has_succ Un_least_lt) |
|
822 |
done |
|
823 |
||
824 |
||
825 |
||
13651
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
826 |
text{*The rank function for the constructible universe*} |
21233 | 827 |
definition |
13651
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
828 |
lrank :: "i=>i" --{*Kunen's definition VI 1.7*} |
14171
0cab06e3bbd0
Extended the notion of letter and digit, such that now one may use greek,
skalberg
parents:
13721
diff
changeset
|
829 |
"lrank(x) == \<mu> i. x \<in> Lset(succ(i))" |
13223 | 830 |
|
831 |
lemma L_I: "[|x \<in> Lset(i); Ord(i)|] ==> L(x)" |
|
832 |
by (simp add: L_def, blast) |
|
833 |
||
834 |
lemma L_D: "L(x) ==> \<exists>i. Ord(i) & x \<in> Lset(i)" |
|
835 |
by (simp add: L_def) |
|
836 |
||
837 |
lemma Ord_lrank [simp]: "Ord(lrank(a))" |
|
838 |
by (simp add: lrank_def) |
|
839 |
||
840 |
lemma Lset_lrank_lt [rule_format]: "Ord(i) ==> x \<in> Lset(i) --> lrank(x) < i" |
|
841 |
apply (erule trans_induct3) |
|
842 |
apply simp |
|
843 |
apply (simp only: lrank_def) |
|
844 |
apply (blast intro: Least_le) |
|
845 |
apply (simp_all add: Limit_Lset_eq) |
|
846 |
apply (blast intro: ltI Limit_is_Ord lt_trans) |
|
847 |
done |
|
848 |
||
13651
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
849 |
text{*Kunen's VI 1.8. The proof is much harder than the text would |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
850 |
suggest. For a start, it needs the previous lemma, which is proved by |
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
851 |
induction.*} |
13223 | 852 |
lemma Lset_iff_lrank_lt: "Ord(i) ==> x \<in> Lset(i) <-> L(x) & lrank(x) < i" |
853 |
apply (simp add: L_def, auto) |
|
854 |
apply (blast intro: Lset_lrank_lt) |
|
855 |
apply (unfold lrank_def) |
|
856 |
apply (drule succI1 [THEN Lset_mono_mem, THEN subsetD]) |
|
857 |
apply (drule_tac P="\<lambda>i. x \<in> Lset(succ(i))" in LeastI, assumption) |
|
858 |
apply (blast intro!: le_imp_subset Lset_mono [THEN subsetD]) |
|
859 |
done |
|
860 |
||
861 |
lemma Lset_succ_lrank_iff [simp]: "x \<in> Lset(succ(lrank(x))) <-> L(x)" |
|
862 |
by (simp add: Lset_iff_lrank_lt) |
|
863 |
||
13651
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
864 |
text{*Kunen's VI 1.9 (a)*} |
13223 | 865 |
lemma lrank_of_Ord: "Ord(i) ==> lrank(i) = i" |
866 |
apply (unfold lrank_def) |
|
867 |
apply (rule Least_equality) |
|
868 |
apply (erule Ord_in_Lset) |
|
869 |
apply assumption |
|
870 |
apply (insert notin_Lset [of i]) |
|
871 |
apply (blast intro!: le_imp_subset Lset_mono [THEN subsetD]) |
|
872 |
done |
|
873 |
||
13245 | 874 |
|
13223 | 875 |
text{*This is lrank(lrank(a)) = lrank(a) *} |
876 |
declare Ord_lrank [THEN lrank_of_Ord, simp] |
|
877 |
||
13651
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
878 |
text{*Kunen's VI 1.10 *} |
13223 | 879 |
lemma Lset_in_Lset_succ: "Lset(i) \<in> Lset(succ(i))"; |
880 |
apply (simp add: Lset_succ DPow_def) |
|
13339
0f89104dd377
Fixed quantified variable name preservation for ball and bex (bounded quants)
paulson
parents:
13328
diff
changeset
|
881 |
apply (rule_tac x=Nil in bexI) |
13223 | 882 |
apply (rule_tac x="Equal(0,0)" in bexI) |
883 |
apply auto |
|
884 |
done |
|
885 |
||
886 |
lemma lrank_Lset: "Ord(i) ==> lrank(Lset(i)) = i" |
|
887 |
apply (unfold lrank_def) |
|
888 |
apply (rule Least_equality) |
|
889 |
apply (rule Lset_in_Lset_succ) |
|
890 |
apply assumption |
|
891 |
apply clarify |
|
892 |
apply (subgoal_tac "Lset(succ(ia)) <= Lset(i)") |
|
893 |
apply (blast dest: mem_irrefl) |
|
894 |
apply (blast intro!: le_imp_subset Lset_mono) |
|
895 |
done |
|
896 |
||
13651
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
897 |
text{*Kunen's VI 1.11 *} |
13223 | 898 |
lemma Lset_subset_Vset: "Ord(i) ==> Lset(i) <= Vset(i)"; |
899 |
apply (erule trans_induct) |
|
900 |
apply (subst Lset) |
|
901 |
apply (subst Vset) |
|
902 |
apply (rule UN_mono [OF subset_refl]) |
|
903 |
apply (rule subset_trans [OF DPow_subset_Pow]) |
|
904 |
apply (rule Pow_mono, blast) |
|
905 |
done |
|
906 |
||
13651
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
907 |
text{*Kunen's VI 1.12 *} |
13535 | 908 |
lemma Lset_subset_Vset': "i \<in> nat ==> Lset(i) = Vset(i)"; |
13223 | 909 |
apply (erule nat_induct) |
910 |
apply (simp add: Vfrom_0) |
|
911 |
apply (simp add: Lset_succ Vset_succ Finite_Vset Finite_DPow_eq_Pow) |
|
912 |
done |
|
913 |
||
13291 | 914 |
text{*Every set of constructible sets is included in some @{term Lset}*} |
915 |
lemma subset_Lset: |
|
916 |
"(\<forall>x\<in>A. L(x)) ==> \<exists>i. Ord(i) & A \<subseteq> Lset(i)" |
|
917 |
by (rule_tac x = "\<Union>x\<in>A. succ(lrank(x))" in exI, force) |
|
918 |
||
919 |
lemma subset_LsetE: |
|
920 |
"[|\<forall>x\<in>A. L(x); |
|
921 |
!!i. [|Ord(i); A \<subseteq> Lset(i)|] ==> P|] |
|
922 |
==> P" |
|
923 |
by (blast dest: subset_Lset) |
|
924 |
||
13651
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
925 |
subsubsection{*For L to satisfy the Powerset axiom *} |
13223 | 926 |
|
927 |
lemma LPow_env_typing: |
|
13721 | 928 |
"[| y \<in> Lset(i); Ord(i); y \<subseteq> X |] |
13511 | 929 |
==> \<exists>z \<in> Pow(X). y \<in> Lset(succ(lrank(z)))" |
13223 | 930 |
by (auto intro: L_I iff: Lset_succ_lrank_iff) |
931 |
||
932 |
lemma LPow_in_Lset: |
|
933 |
"[|X \<in> Lset(i); Ord(i)|] ==> \<exists>j. Ord(j) & {y \<in> Pow(X). L(y)} \<in> Lset(j)" |
|
934 |
apply (rule_tac x="succ(\<Union>y \<in> Pow(X). succ(lrank(y)))" in exI) |
|
935 |
apply simp |
|
936 |
apply (rule LsetI [OF succI1]) |
|
937 |
apply (simp add: DPow_def) |
|
938 |
apply (intro conjI, clarify) |
|
13511 | 939 |
apply (rule_tac a=x in UN_I, simp+) |
13223 | 940 |
txt{*Now to create the formula @{term "y \<subseteq> X"} *} |
941 |
apply (rule_tac x="Cons(X,Nil)" in bexI) |
|
942 |
apply (rule_tac x="subset_fm(0,1)" in bexI) |
|
943 |
apply typecheck |
|
13511 | 944 |
apply (rule conjI) |
13223 | 945 |
apply (simp add: succ_Un_distrib [symmetric]) |
946 |
apply (rule equality_iffI) |
|
13511 | 947 |
apply (simp add: Transset_UN [OF Transset_Lset] LPow_env_typing) |
13223 | 948 |
apply (auto intro: L_I iff: Lset_succ_lrank_iff) |
949 |
done |
|
950 |
||
13245 | 951 |
theorem LPow_in_L: "L(X) ==> L({y \<in> Pow(X). L(y)})" |
13223 | 952 |
by (blast intro: L_I dest: L_D LPow_in_Lset) |
953 |
||
13385
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
954 |
|
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
955 |
subsection{*Eliminating @{term arity} from the Definition of @{term Lset}*} |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
956 |
|
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
957 |
lemma nth_zero_eq_0: "n \<in> nat ==> nth(n,[0]) = 0" |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
958 |
by (induct_tac n, auto) |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
959 |
|
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
960 |
lemma sats_app_0_iff [rule_format]: |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
961 |
"[| p \<in> formula; 0 \<in> A |] |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
962 |
==> \<forall>env \<in> list(A). sats(A,p, env@[0]) <-> sats(A,p,env)" |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
963 |
apply (induct_tac p) |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
964 |
apply (simp_all del: app_Cons add: app_Cons [symmetric] |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
965 |
add: nth_zero_eq_0 nth_append not_lt_iff_le nth_eq_0) |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
966 |
done |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
967 |
|
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
968 |
lemma sats_app_zeroes_iff: |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
969 |
"[| p \<in> formula; 0 \<in> A; env \<in> list(A); n \<in> nat |] |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
970 |
==> sats(A,p,env @ repeat(0,n)) <-> sats(A,p,env)" |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
971 |
apply (induct_tac n, simp) |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
972 |
apply (simp del: repeat.simps |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
973 |
add: repeat_succ_app sats_app_0_iff app_assoc [symmetric]) |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
974 |
done |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
975 |
|
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
976 |
lemma exists_bigger_env: |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
977 |
"[| p \<in> formula; 0 \<in> A; env \<in> list(A) |] |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
978 |
==> \<exists>env' \<in> list(A). arity(p) \<le> succ(length(env')) & |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
979 |
(\<forall>a\<in>A. sats(A,p,Cons(a,env')) <-> sats(A,p,Cons(a,env)))" |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
980 |
apply (rule_tac x="env @ repeat(0,arity(p))" in bexI) |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
981 |
apply (simp del: app_Cons add: app_Cons [symmetric] |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
982 |
add: length_repeat sats_app_zeroes_iff, typecheck) |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
983 |
done |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
984 |
|
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
985 |
|
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
986 |
text{*A simpler version of @{term DPow}: no arity check!*} |
21233 | 987 |
definition DPow' :: "i => i" |
13385
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
988 |
"DPow'(A) == {X \<in> Pow(A). |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
989 |
\<exists>env \<in> list(A). \<exists>p \<in> formula. |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
990 |
X = {x\<in>A. sats(A, p, Cons(x,env))}}" |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
991 |
|
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
992 |
lemma DPow_subset_DPow': "DPow(A) <= DPow'(A)"; |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
993 |
by (simp add: DPow_def DPow'_def, blast) |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
994 |
|
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
995 |
lemma DPow'_0: "DPow'(0) = {0}" |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
996 |
by (auto simp add: DPow'_def) |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
997 |
|
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
998 |
lemma DPow'_subset_DPow: "0 \<in> A ==> DPow'(A) \<subseteq> DPow(A)" |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
999 |
apply (auto simp add: DPow'_def DPow_def) |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1000 |
apply (frule exists_bigger_env, assumption+, force) |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1001 |
done |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1002 |
|
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1003 |
lemma DPow_eq_DPow': "Transset(A) ==> DPow(A) = DPow'(A)" |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1004 |
apply (drule Transset_0_disj) |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1005 |
apply (erule disjE) |
13651
ac80e101306a
Cosmetic changes suggested by writing the paper. Deleted some
paulson
parents:
13647
diff
changeset
|
1006 |
apply (simp add: DPow'_0 Finite_DPow_eq_Pow) |
13385
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1007 |
apply (rule equalityI) |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1008 |
apply (rule DPow_subset_DPow') |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1009 |
apply (erule DPow'_subset_DPow) |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1010 |
done |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1011 |
|
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1012 |
text{*And thus we can relativize @{term Lset} without bothering with |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1013 |
@{term arity} and @{term length}*} |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1014 |
lemma Lset_eq_transrec_DPow': "Lset(i) = transrec(i, %x f. \<Union>y\<in>x. DPow'(f`y))" |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1015 |
apply (rule_tac a=i in eps_induct) |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1016 |
apply (subst Lset) |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1017 |
apply (subst transrec) |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1018 |
apply (simp only: DPow_eq_DPow' [OF Transset_Lset], simp) |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1019 |
done |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1020 |
|
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1021 |
text{*With this rule we can specify @{term p} later and don't worry about |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1022 |
arities at all!*} |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1023 |
lemma DPow_LsetI [rule_format]: |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1024 |
"[|\<forall>x\<in>Lset(i). P(x) <-> sats(Lset(i), p, Cons(x,env)); |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1025 |
env \<in> list(Lset(i)); p \<in> formula|] |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1026 |
==> {x\<in>Lset(i). P(x)} \<in> DPow(Lset(i))" |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1027 |
by (simp add: DPow_eq_DPow' [OF Transset_Lset] DPow'_def, blast) |
31df66ca0780
Expressing Lset and L without using length and arity; simplifies Separation
paulson
parents:
13339
diff
changeset
|
1028 |
|
13223 | 1029 |
end |