Mercurial > hg > Members > kono > Proof > ZF-in-agda
view src/generic-filter.agda @ 1256:0b7e4eb68afc
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author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Thu, 16 Mar 2023 19:01:47 +0900 |
parents | afecaee48825 |
children | 004d8794697f |
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{-# OPTIONS --allow-unsolved-metas #-} import Level open import Ordinals module generic-filter {n : Level.Level } (O : Ordinals {n}) where import filter open import zf open import logic -- open import partfunc {n} O import OD open import Relation.Nullary open import Relation.Binary open import Data.Empty open import Relation.Binary open import Relation.Binary.Core open import Relation.Binary.PropositionalEquality open import Data.Nat import BAlgebra open BAlgebra O open inOrdinal O open OD O open OD.OD open ODAxiom odAxiom import OrdUtil import ODUtil open Ordinals.Ordinals O open Ordinals.IsOrdinals isOrdinal open Ordinals.IsNext isNext open OrdUtil O open ODUtil O import ODC open filter O open _∧_ open _∨_ open Bool open HOD ------- -- the set of finite partial functions from ω to 2 -- -- open import Data.List hiding (filter) open import Data.Maybe open import ZProduct O record CountableModel : Set (Level.suc (Level.suc n)) where field ctl-M : HOD ctl→ : ℕ → Ordinal ctl<M : (x : ℕ) → odef (ctl-M) (ctl→ x) ctl← : (x : Ordinal )→ odef (ctl-M ) x → ℕ ctl-iso→ : { x : Ordinal } → (lt : odef (ctl-M) x ) → ctl→ (ctl← x lt ) ≡ x TC : {x y : Ordinal} → odef ctl-M x → odef (* x) y → odef ctl-M y is-model : (x : HOD) → & x o< & ctl-M → ctl-M ∋ (x ∩ ctl-M) -- we have no otherway round -- ctl-iso← : { x : ℕ } → ctl← (ctl→ x ) (ctl<M x) ≡ x -- -- almmost universe -- find-p contains ∃ x : Ordinal → x o< & M → ∀ r ∈ M → ∈ Ord x -- -- we expect P ∈ * ctl-M ∧ G ⊆ L ⊆ Power P , ¬ G ∈ * ctl-M, open CountableModel ---- -- a(n) ∈ M -- ∃ q ∈ L ⊆ Power P → q ∈ a(n) ∧ p(n) ⊆ q -- PGHOD : (i : ℕ) (L : HOD) (C : CountableModel ) → (p : Ordinal) → HOD PGHOD i L C p = record { od = record { def = λ x → odef L x ∧ odef (* (ctl→ C i)) x ∧ ( (y : Ordinal ) → odef (* p) y → odef (* x) y ) } ; odmax = odmax L ; <odmax = λ {y} lt → <odmax L (proj1 lt) } --- -- p(n+1) = if ({q | q ∈ a(n) ∧ p(n) ⊆ q)} != ∅ then q otherwise p(n) -- find-p : (L : HOD ) (C : CountableModel ) (i : ℕ) → (x : Ordinal) → Ordinal find-p L C zero x = x find-p L C (suc i) x with is-o∅ ( & ( PGHOD i L C (find-p L C i x)) ) ... | yes y = find-p L C i x ... | no not = & (ODC.minimal O ( PGHOD i L C (find-p L C i x)) (λ eq → not (=od∅→≡o∅ eq))) -- axiom of choice --- -- G = { r ∈ L ⊆ Power P | ∃ n → r ⊆ p(n) } -- record PDN (L p : HOD ) (C : CountableModel ) (x : Ordinal) : Set n where field gr : ℕ pn<gr : (y : Ordinal) → odef (* x) y → odef (* (find-p L C gr (& p))) y x∈PP : odef L x open PDN --- -- G as a HOD -- PDHOD : (L p : HOD ) (C : CountableModel ) → HOD PDHOD L p C = record { od = record { def = λ x → PDN L p C x } ; odmax = odmax L ; <odmax = λ {y} lt → <odmax L {y} (PDN.x∈PP lt) } open PDN ---- -- Generic Filter on Power P for HOD's Countable Ordinal (G ⊆ Power P ≡ G i.e. ℕ → P → Set ) -- -- p 0 ≡ ∅ -- p (suc n) = if ∃ q ∈ M ∧ p n ⊆ q → q (by axiom of choice) ( q = * ( ctl→ n ) ) --- else p n P∅ : {P : HOD} → odef (Power P) o∅ P∅ {P} = subst (λ k → odef (Power P) k ) ord-od∅ (lemma o∅ o∅≡od∅) where lemma : (x : Ordinal ) → * x ≡ od∅ → odef (Power P) (& od∅) lemma x eq = power← P od∅ (λ {x} lt → ⊥-elim (¬x<0 lt )) x<y→∋ : {x y : Ordinal} → odef (* x) y → * x ∋ * y x<y→∋ {x} {y} lt = subst (λ k → odef (* x) k ) (sym &iso) lt gf05 : {a b : HOD} {x : Ordinal } → (odef (a ∪ b) x ) → ¬ odef a x → ¬ odef b x → ⊥ gf05 {a} {b} {x} (case1 ax) nax nbx = nax ax gf05 {a} {b} {x} (case2 bx) nax nbx = nbx bx gf02 : {P a b : HOD } → (P \ a) ∩ (P \ b) ≡ ( P \ (a ∪ b) ) gf02 {P} {a} {b} = ==→o≡ record { eq→ = gf03 ; eq← = gf04 } where gf03 : {x : Ordinal} → odef ((P \ a) ∩ (P \ b)) x → odef (P \ (a ∪ b)) x gf03 {x} ⟪ ⟪ Px , ¬ax ⟫ , ⟪ _ , ¬bx ⟫ ⟫ = ⟪ Px , (λ pab → gf05 {a} {b} {x} pab ¬ax ¬bx ) ⟫ gf04 : {x : Ordinal} → odef (P \ (a ∪ b)) x → odef ((P \ a) ∩ (P \ b)) x gf04 {x} ⟪ Px , abx ⟫ = ⟪ ⟪ Px , (λ ax → abx (case1 ax) ) ⟫ , ⟪ Px , (λ bx → abx (case2 bx) ) ⟫ ⟫ gf45 : {P a b : HOD } → (P \ a) ∪ (P \ b) ≡ ( P \ (a ∩ b) ) gf45 {P} {a} {b} = ==→o≡ record { eq→ = gf03 ; eq← = gf04 } where gf03 : {x : Ordinal} → odef ((P \ a) ∪ (P \ b)) x → odef (P \ (a ∩ b)) x gf03 {x} (case1 pa) = ⟪ proj1 pa , (λ ab → proj2 pa (proj1 ab) ) ⟫ gf03 {x} (case2 pb) = ⟪ proj1 pb , (λ ab → proj2 pb (proj2 ab) ) ⟫ gf04 : {x : Ordinal} → odef (P \ (a ∩ b)) x → odef ((P \ a) ∪ (P \ b)) x gf04 {x} ⟪ Px , nab ⟫ with ODC.p∨¬p O (odef b x) ... | case1 bx = case1 ⟪ Px , ( λ ax → nab ⟪ ax , bx ⟫ ) ⟫ ... | case2 nbx = case2 ⟪ Px , ( λ bx → nbx bx ) ⟫ open import Data.Nat.Properties open import nat p-monotonic1 : (L p : HOD ) (C : CountableModel ) → {n : ℕ} → (* (find-p L C n (& p))) ⊆ (* (find-p L C (suc n) (& p))) p-monotonic1 L p C {n} {x} with is-o∅ (& (PGHOD n L C (find-p L C n (& p)))) ... | yes y = refl-⊆ {* (find-p L C n (& p))} ... | no not = λ lt → proj2 (proj2 fmin∈PGHOD) _ lt where fmin : HOD fmin = ODC.minimal O (PGHOD n L C (find-p L C n (& p))) (λ eq → not (=od∅→≡o∅ eq)) fmin∈PGHOD : PGHOD n L C (find-p L C n (& p)) ∋ fmin fmin∈PGHOD = ODC.x∋minimal O (PGHOD n L C (find-p L C n (& p))) (λ eq → not (=od∅→≡o∅ eq)) p-monotonic : (L p : HOD ) (C : CountableModel ) → {n m : ℕ} → n ≤ m → (* (find-p L C n (& p))) ⊆ (* (find-p L C m (& p))) p-monotonic L p C {zero} {zero} n≤m = refl-⊆ {* (find-p L C zero (& p))} p-monotonic L p C {zero} {suc m} z≤n lt = p-monotonic1 L p C {m} (p-monotonic L p C {zero} {m} z≤n lt ) p-monotonic L p C {suc n} {suc m} (s≤s n≤m) with <-cmp n m ... | tri< a ¬b ¬c = λ lt → p-monotonic1 L p C {m} (p-monotonic L p C {suc n} {m} a lt) ... | tri≈ ¬a refl ¬c = λ x → x ... | tri> ¬a ¬b c = ⊥-elim ( nat-≤> n≤m c ) record Expansion (L : HOD) {p : HOD } (dense : HOD) (Lp : L ∋ p) : Set (Level.suc n) where field expansion : HOD dense∋exp : dense ∋ expansion p⊆exp : p ⊆ expansion record Dense {L P : HOD } (LP : L ⊆ Power P) : Set (Level.suc n) where field dense : HOD d⊆P : dense ⊆ L has-expansion : {p : HOD} → (Lp : L ∋ p) → Expansion L dense Lp record GenericFilter {L P : HOD} (LP : L ⊆ Power P) (M : HOD) : Set (Level.suc n) where field genf : Ideal {L} {P} LP generic : (D : Dense {L} {P} LP ) → M ∋ Dense.dense D → ¬ ( (Dense.dense D ∩ Ideal.ideal genf ) ≡ od∅ ) P-GenericFilter : (P L p0 : HOD ) → (LP : L ⊆ Power P) → L ∋ p0 → (C : CountableModel ) → GenericFilter {L} {P} LP ( ctl-M C ) P-GenericFilter P L p0 L⊆PP Lp0 C = record { genf = record { ideal = PDHOD L p0 C ; i⊆L = x∈PP ; ideal1 = ideal1 ; ideal2 = ? } ; generic = fdense } where ideal1 : {p q : HOD} → L ∋ q → PDHOD L p0 C ∋ p → q ⊆ p → PDHOD L p0 C ∋ q ideal1 {p} {q} Lq record { gr = gr ; pn<gr = pn<gr ; x∈PP = x∈PP } q⊆p = record { gr = gr ; pn<gr = λ y qy → pn<gr y (gf00 qy) ; x∈PP = Lq } where gf00 : {y : Ordinal } → odef (* (& q)) y → odef (* (& p)) y gf00 {y} qy = subst (λ k → odef k y ) (sym *iso) (q⊆p (subst (λ k → odef k y) *iso qy )) ideal2 : {p q : HOD} → PDHOD L p0 C ∋ p → PDHOD L p0 C ∋ q → L ∋ (p ∪ q) → PDHOD L p0 C ∋ (p ∪ q) ideal2 {p} {q} record { gr = pgr ; pn<gr = ppn ; x∈PP = PPp } record { gr = qgr ; pn<gr = qpn ; x∈PP = PPq } Lpq = gf01 where Pp = record { gr = pgr ; pn<gr = ppn ; x∈PP = PPp } Pq = record { gr = qgr ; pn<gr = qpn ; x∈PP = PPq } gf01 : PDHOD L p0 C ∋ (p ∪ q) gf01 with <-cmp pgr qgr ... | tri< a ¬b ¬c = record { gr = qgr ; pn<gr = gf03 ; x∈PP = Lpq } where gf03 : (y : Ordinal) → odef (* (& (p ∪ q))) y → odef (* (find-p L C qgr (& p0))) y gf03 y pqy = gf15 y pqy where gf16 : gr Pp ≤ gr Pq gf16 = <to≤ a gf15 : (y : Ordinal) → odef (* (& (p ∪ q))) y → odef (* (find-p L C (gr Pq) (& p0))) y gf15 y gpqy with subst (λ k → odef k y ) *iso gpqy ... | case1 xpy = p-monotonic L p0 C gf16 (PDN.pn<gr Pp y (subst (λ k → odef k y) (sym *iso) xpy) ) ... | case2 xqy = PDN.pn<gr Pq _ (subst (λ k → odef k y) (sym *iso) xqy) ... | tri≈ ¬a refl ¬c = record { gr = qgr ; pn<gr = gf03 ; x∈PP = Lpq } where gf03 : (y : Ordinal) → odef (* (& (p ∪ q))) y → odef (* (find-p L C qgr (& p0))) y gf03 y pqy = gf15 y pqy where gf16 : gr Pp ≤ gr Pq gf16 = ≤-refl gf15 : (y : Ordinal) → odef (* (& (p ∪ q))) y → odef (* (find-p L C (gr Pq) (& p0))) y gf15 y gpqy with subst (λ k → odef k y ) *iso gpqy ... | case1 xpy = p-monotonic L p0 C gf16 (PDN.pn<gr Pp y (subst (λ k → odef k y) (sym *iso) xpy) ) ... | case2 xqy = PDN.pn<gr Pq _ (subst (λ k → odef k y) (sym *iso) xqy) ... | tri> ¬a ¬b c = record { gr = pgr ; pn<gr = gf03 ; x∈PP = Lpq } where gf03 : (y : Ordinal) → odef (* (& (p ∪ q))) y → odef (* (find-p L C pgr (& p0))) y gf03 y ppy = gf15 y ppy where gf16 : gr Pq ≤ gr Pp gf16 = <to≤ c gf15 : (y : Ordinal) → odef (* (& (p ∪ q))) y → odef (* (find-p L C (gr Pp) (& p0))) y gf15 y gppy with subst (λ k → odef k y ) *iso gppy ... | case2 xqy = p-monotonic L p0 C gf16 (PDN.pn<gr Pq y (subst (λ k → odef k y) (sym *iso) xqy) ) ... | case1 xpy = PDN.pn<gr Pp _ (subst (λ k → odef k y) (sym *iso) xpy) fdense : (D : Dense {L} {P} L⊆PP ) → (ctl-M C ) ∋ Dense.dense D → ¬ (Dense.dense D ∩ (PDHOD L p0 C)) ≡ od∅ fdense D MD eq0 = ⊥-elim ( ∅< {Dense.dense D ∩ PDHOD L p0 C} fd01 (≡od∅→=od∅ eq0 )) where open Dense open Expansion fd09 : (i : ℕ ) → odef L (find-p L C i (& p0)) fd09 zero = Lp0 fd09 (suc i) with is-o∅ ( & ( PGHOD i L C (find-p L C i (& p0))) ) ... | yes _ = fd09 i ... | no not = fd17 where fd19 = ODC.minimal O ( PGHOD i L C (find-p L C i (& p0))) (λ eq → not (=od∅→≡o∅ eq)) fd18 : PGHOD i L C (find-p L C i (& p0)) ∋ fd19 fd18 = ODC.x∋minimal O (PGHOD i L C (find-p L C i (& p0))) (λ eq → not (=od∅→≡o∅ eq)) fd17 : odef L ( & (ODC.minimal O ( PGHOD i L C (find-p L C i (& p0))) (λ eq → not (=od∅→≡o∅ eq))) ) fd17 = proj1 fd18 an : ℕ an = ctl← C (& (dense D)) MD pn : Ordinal pn = find-p L C an (& p0) pn+1 : Ordinal pn+1 = find-p L C (suc an) (& p0) d=an : dense D ≡ * (ctl→ C an) d=an = begin dense D ≡⟨ sym *iso ⟩ * ( & (dense D)) ≡⟨ cong (*) (sym (ctl-iso→ C MD )) ⟩ * (ctl→ C an) ∎ where open ≡-Reasoning fd07 : odef (dense D) pn+1 fd07 with is-o∅ ( & ( PGHOD an L C (find-p L C an (& p0))) ) ... | yes y = ⊥-elim ( ¬x<0 ( _==_.eq→ fd10 fd21 ) ) where L∋pn : L ∋ * (find-p L C an (& p0)) L∋pn = subst (λ k → odef L k) (sym &iso) (fd09 an ) exp = has-expansion D L∋pn L∋df : L ∋ ( expansion exp ) L∋df = (d⊆P D) (dense∋exp exp) pn∋df : (* (ctl→ C an)) ∋ ( expansion exp) pn∋df = subst (λ k → odef k (& ( expansion exp))) d=an (dense∋exp exp ) pn⊆df : (y : Ordinal) → odef (* (find-p L C an (& p0))) y → odef (* (& (expansion exp))) y pn⊆df y py = subst (λ k → odef k y ) (sym *iso) (p⊆exp exp py) fd21 : odef (PGHOD an L C (find-p L C an (& p0)) ) (& (expansion exp)) fd21 = ⟪ L∋df , ⟪ pn∋df , pn⊆df ⟫ ⟫ fd10 : PGHOD an L C (find-p L C an (& p0)) =h= od∅ fd10 = ≡o∅→=od∅ y ... | no not = fd27 where fd29 = ODC.minimal O ( PGHOD an L C (find-p L C an (& p0))) (λ eq → not (=od∅→≡o∅ eq)) fd28 : PGHOD an L C (find-p L C an (& p0)) ∋ fd29 fd28 = ODC.x∋minimal O (PGHOD an L C (find-p L C an (& p0))) (λ eq → not (=od∅→≡o∅ eq)) fd27 : odef (dense D) (& fd29) fd27 = subst (λ k → odef k (& fd29)) (sym d=an) (proj1 (proj2 fd28)) fd03 : odef (PDHOD L p0 C) pn+1 fd03 = record { gr = suc an ; pn<gr = λ y lt → lt ; x∈PP = fd09 (suc an)} fd01 : (dense D ∩ PDHOD L p0 C) ∋ (* pn+1) fd01 = ⟪ subst (λ k → odef (dense D) k ) (sym &iso) fd07 , subst (λ k → odef (PDHOD L p0 C) k) (sym &iso) fd03 ⟫ open GenericFilter open Filter record NotCompatible (L p : HOD ) (L∋a : L ∋ p ) : Set (Level.suc (Level.suc n)) where field q r : HOD Lq : L ∋ q Lr : L ∋ r p⊆q : p ⊆ q p⊆r : p ⊆ r ¬compat : (s : HOD) → L ∋ s → ¬ ( (q ⊆ s) ∧ (r ⊆ s) ) lemma232 : (P L p0 : HOD ) → (LPP : L ⊆ Power P) → (Lp0 : L ∋ p0 ) → (C : CountableModel ) → ctl-M C ∋ L → ( {p : HOD} → (Lp : L ∋ p ) → NotCompatible L p Lp ) → ¬ ( ctl-M C ∋ Ideal.ideal (genf ( P-GenericFilter P L p0 LPP Lp0 C ))) lemma232 P L p0 LPP Lp0 C ML NC MF = ¬rgf∩D=0 record { eq→ = λ {x} rgf∩D → ⊥-elim( proj2 (proj1 rgf∩D) (proj2 rgf∩D)) ; eq← = λ lt → ⊥-elim (¬x<0 lt) } where PG = P-GenericFilter P L p0 LPP Lp0 C GF = genf PG rgf = Ideal.ideal (genf PG) M = ctl-M C D : HOD D = L \ rgf M∋DM : M ∋ (D ∩ M ) M∋DM = is-model C D ? M∋D : M ∋ D M∋D = ? M∋G : M ∋ rgf M∋G = MF D⊆PP : D ⊆ Power P D⊆PP {x} ⟪ Lx , ngx ⟫ = LPP Lx DD : Dense {L} {P} LPP DD = record { dense = D ; d⊆P = proj1 ; has-expansion = exp } where exp : {p : HOD} → (Lp : L ∋ p) → Expansion L D Lp exp {p} Lp = exp1 where q : HOD q = NotCompatible.q (NC Lp) r : HOD r = NotCompatible.r (NC Lp) Lq : L ∋ q Lq = NotCompatible.Lq (NC Lp) exp1 : Expansion L D Lp exp1 with ODC.p∨¬p O (rgf ∋ q) ... | case2 ngq = record { expansion = q ; dense∋exp = ? ; p⊆exp = ? } ... | case1 gq with ODC.p∨¬p O (rgf ∋ r) ... | case2 ngr = record { expansion = q ; dense∋exp = ? ; p⊆exp = ? } ... | case1 gr = ⊥-elim ( ll02 ⟪ ? , ? ⟫ ) where ll02 : ¬ ( (q ⊆ p) ∧ (r ⊆ p) ) ll02 = NotCompatible.¬compat (NC Lp) p ? ll05 : ¬ ( (q ⊆ (q ∪ r) ∧ (r ⊆ (q ∪ r)) )) ll05 = NotCompatible.¬compat (NC Lp ) (q ∪ r) ? ll03 : rgf ∋ p → rgf ∋ q → rgf ∋ (p ∪ q) ll03 rp rq = ? -- Ideal.ideal2 GF ⟪ rp , rq ⟫ ll04 : rgf ∋ p → q ⊆ p → rgf ∋ q ll04 rp q⊆p = ? -- Ideal.ideal1 GF rp q⊆p ? ¬rgf∩D=0 : ¬ ( (D ∩ rgf ) =h= od∅ ) ¬rgf∩D=0 eq = generic PG DD M∋D (==→o≡ eq) -- -- P-Generic Filter defines a countable model D ⊂ C from P -- -- -- in D, we have V ≠ L -- -- -- val x G = { val y G | ∃ p → G ∋ p → x ∋ < y , p > } -- record valR (x : HOD) {P L : HOD} {LP : L ⊆ Power P} (C : CountableModel ) (G : GenericFilter {L} {P} LP (ctl-M C) ) : Set (Level.suc n) where field valx : HOD record valS (ox oy oG : Ordinal) : Set n where field op : Ordinal p∈G : odef (* oG) op is-val : odef (* ox) ( & < * oy , * op > ) val : (x : HOD) {P L : HOD } {LP : L ⊆ Power P} → (G : GenericFilter {L} {P} LP {!!} ) → HOD val x G = TransFinite {λ x → HOD } ind (& x) where ind : (x : Ordinal) → ((y : Ordinal) → y o< x → HOD) → HOD ind x valy = record { od = record { def = λ y → valS x y (& (Ideal.ideal (genf G))) } ; odmax = {!!} ; <odmax = {!!} }