Mercurial > hg > Members > kono > Proof > ZF-in-agda
annotate src/zorn.agda @ 771:7679fef53073
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| author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Tue, 26 Jul 2022 03:37:25 +0900 |
| parents | 798d8b8c36b1 |
| children | 068cba4ee934 |
| rev | line source |
|---|---|
| 478 | 1 {-# OPTIONS --allow-unsolved-metas #-} |
| 508 | 2 open import Level hiding ( suc ; zero ) |
| 431 | 3 open import Ordinals |
| 552 | 4 open import Relation.Binary |
| 5 open import Relation.Binary.Core | |
| 6 open import Relation.Binary.PropositionalEquality | |
| 497 | 7 import OD |
| 552 | 8 module zorn {n : Level } (O : Ordinals {n}) (_<_ : (x y : OD.HOD O ) → Set n ) (PO : IsStrictPartialOrder _≡_ _<_ ) where |
| 431 | 9 |
| 560 | 10 -- |
| 11 -- Zorn-lemma : { A : HOD } | |
| 12 -- → o∅ o< & A | |
| 13 -- → ( ( B : HOD) → (B⊆A : B ⊆ A) → IsTotalOrderSet B → SUP A B ) -- SUP condition | |
| 14 -- → Maximal A | |
| 15 -- | |
| 16 | |
| 431 | 17 open import zf |
| 477 | 18 open import logic |
| 19 -- open import partfunc {n} O | |
| 20 | |
| 21 open import Relation.Nullary | |
| 22 open import Data.Empty | |
| 23 import BAlgbra | |
| 431 | 24 |
| 555 | 25 open import Data.Nat hiding ( _<_ ; _≤_ ) |
| 26 open import Data.Nat.Properties | |
| 27 open import nat | |
| 28 | |
| 431 | 29 |
| 30 open inOrdinal O | |
| 31 open OD O | |
| 32 open OD.OD | |
| 33 open ODAxiom odAxiom | |
| 477 | 34 import OrdUtil |
| 35 import ODUtil | |
| 431 | 36 open Ordinals.Ordinals O |
| 37 open Ordinals.IsOrdinals isOrdinal | |
| 38 open Ordinals.IsNext isNext | |
| 39 open OrdUtil O | |
| 477 | 40 open ODUtil O |
| 41 | |
| 42 | |
| 43 import ODC | |
| 44 | |
| 45 open _∧_ | |
| 46 open _∨_ | |
| 47 open Bool | |
| 431 | 48 |
| 49 open HOD | |
| 50 | |
| 560 | 51 -- |
| 52 -- Partial Order on HOD ( possibly limited in A ) | |
| 53 -- | |
| 54 | |
| 571 | 55 _<<_ : (x y : Ordinal ) → Set n -- Set n order |
| 570 | 56 x << y = * x < * y |
| 57 | |
| 765 | 58 _<=_ : (x y : Ordinal ) → Set n -- Set n order |
| 59 x <= y = (x ≡ y ) ∨ ( * x < * y ) | |
| 60 | |
| 570 | 61 POO : IsStrictPartialOrder _≡_ _<<_ |
| 62 POO = record { isEquivalence = record { refl = refl ; sym = sym ; trans = trans } | |
| 63 ; trans = IsStrictPartialOrder.trans PO | |
| 64 ; irrefl = λ x=y x<y → IsStrictPartialOrder.irrefl PO (cong (*) x=y) x<y | |
| 65 ; <-resp-≈ = record { fst = λ {x} {y} {y1} y=y1 xy1 → subst (λ k → x << k ) y=y1 xy1 ; snd = λ {x} {x1} {y} x=x1 x1y → subst (λ k → k << x ) x=x1 x1y } } | |
| 66 | |
|
528
8facdd7cc65a
TransitiveClosure with x <= f x is possible
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents:
527
diff
changeset
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67 _≤_ : (x y : HOD) → Set (Level.suc n) |
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8facdd7cc65a
TransitiveClosure with x <= f x is possible
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents:
527
diff
changeset
|
68 x ≤ y = ( x ≡ y ) ∨ ( x < y ) |
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8facdd7cc65a
TransitiveClosure with x <= f x is possible
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents:
527
diff
changeset
|
69 |
| 554 | 70 ≤-ftrans : {x y z : HOD} → x ≤ y → y ≤ z → x ≤ z |
| 71 ≤-ftrans {x} {y} {z} (case1 refl ) (case1 refl ) = case1 refl | |
| 72 ≤-ftrans {x} {y} {z} (case1 refl ) (case2 y<z) = case2 y<z | |
| 73 ≤-ftrans {x} {_} {z} (case2 x<y ) (case1 refl ) = case2 x<y | |
| 74 ≤-ftrans {x} {y} {z} (case2 x<y) (case2 y<z) = case2 ( IsStrictPartialOrder.trans PO x<y y<z ) | |
| 75 | |
| 770 | 76 <=to≤ : {x y : Ordinal } → x <= y → * x ≤ * y |
| 77 <=to≤ (case1 eq) = case1 (cong (*) eq) | |
| 78 <=to≤ (case2 lt) = case2 lt | |
| 79 | |
| 556 | 80 <-irr : {a b : HOD} → (a ≡ b ) ∨ (a < b ) → b < a → ⊥ |
| 81 <-irr {a} {b} (case1 a=b) b<a = IsStrictPartialOrder.irrefl PO (sym a=b) b<a | |
| 82 <-irr {a} {b} (case2 a<b) b<a = IsStrictPartialOrder.irrefl PO refl | |
| 83 (IsStrictPartialOrder.trans PO b<a a<b) | |
| 490 | 84 |
| 561 | 85 ptrans = IsStrictPartialOrder.trans PO |
| 86 | |
| 492 | 87 open _==_ |
| 88 open _⊆_ | |
| 89 | |
| 530 | 90 -- |
| 560 | 91 -- Closure of ≤-monotonic function f has total order |
| 530 | 92 -- |
| 93 | |
| 94 ≤-monotonic-f : (A : HOD) → ( Ordinal → Ordinal ) → Set (Level.suc n) | |
| 95 ≤-monotonic-f A f = (x : Ordinal ) → odef A x → ( * x ≤ * (f x) ) ∧ odef A (f x ) | |
| 96 | |
| 551 | 97 data FClosure (A : HOD) (f : Ordinal → Ordinal ) (s : Ordinal) : Ordinal → Set n where |
| 600 | 98 init : odef A s → FClosure A f s s |
| 555 | 99 fsuc : (x : Ordinal) ( p : FClosure A f s x ) → FClosure A f s (f x) |
| 554 | 100 |
| 556 | 101 A∋fc : {A : HOD} (s : Ordinal) {y : Ordinal } (f : Ordinal → Ordinal) (mf : ≤-monotonic-f A f) → (fcy : FClosure A f s y ) → odef A y |
| 600 | 102 A∋fc {A} s f mf (init as) = as |
| 556 | 103 A∋fc {A} s f mf (fsuc y fcy) = proj2 (mf y ( A∋fc {A} s f mf fcy ) ) |
| 555 | 104 |
| 714 | 105 A∋fcs : {A : HOD} (s : Ordinal) {y : Ordinal } (f : Ordinal → Ordinal) (mf : ≤-monotonic-f A f) → (fcy : FClosure A f s y ) → odef A s |
| 106 A∋fcs {A} s f mf (init as) = as | |
| 107 A∋fcs {A} s f mf (fsuc y fcy) = A∋fcs {A} s f mf fcy | |
| 108 | |
| 556 | 109 s≤fc : {A : HOD} (s : Ordinal ) {y : Ordinal } (f : Ordinal → Ordinal) (mf : ≤-monotonic-f A f) → (fcy : FClosure A f s y ) → * s ≤ * y |
| 600 | 110 s≤fc {A} s {.s} f mf (init x) = case1 refl |
| 556 | 111 s≤fc {A} s {.(f x)} f mf (fsuc x fcy) with proj1 (mf x (A∋fc s f mf fcy ) ) |
| 112 ... | case1 x=fx = subst (λ k → * s ≤ * k ) (*≡*→≡ x=fx) ( s≤fc {A} s f mf fcy ) | |
| 113 ... | case2 x<fx with s≤fc {A} s f mf fcy | |
| 114 ... | case1 s≡x = case2 ( subst₂ (λ j k → j < k ) (sym s≡x) refl x<fx ) | |
| 115 ... | case2 s<x = case2 ( IsStrictPartialOrder.trans PO s<x x<fx ) | |
| 555 | 116 |
| 557 | 117 fcn : {A : HOD} (s : Ordinal) { x : Ordinal} {f : Ordinal → Ordinal} → (mf : ≤-monotonic-f A f) → FClosure A f s x → ℕ |
| 600 | 118 fcn s mf (init as) = zero |
| 558 | 119 fcn {A} s {x} {f} mf (fsuc y p) with proj1 (mf y (A∋fc s f mf p)) |
| 120 ... | case1 eq = fcn s mf p | |
| 121 ... | case2 y<fy = suc (fcn s mf p ) | |
| 557 | 122 |
| 558 | 123 fcn-inject : {A : HOD} (s : Ordinal) { x y : Ordinal} {f : Ordinal → Ordinal} → (mf : ≤-monotonic-f A f) |
| 124 → (cx : FClosure A f s x ) (cy : FClosure A f s y ) → fcn s mf cx ≡ fcn s mf cy → * x ≡ * y | |
| 559 | 125 fcn-inject {A} s {x} {y} {f} mf cx cy eq = fc00 (fcn s mf cx) (fcn s mf cy) eq cx cy refl refl where |
| 126 fc00 : (i j : ℕ ) → i ≡ j → {x y : Ordinal } → (cx : FClosure A f s x ) (cy : FClosure A f s y ) → i ≡ fcn s mf cx → j ≡ fcn s mf cy → * x ≡ * y | |
| 600 | 127 fc00 zero zero refl (init _) (init x₁) i=x i=y = refl |
| 128 fc00 zero zero refl (init as) (fsuc y cy) i=x i=y with proj1 (mf y (A∋fc s f mf cy ) ) | |
| 129 ... | case1 y=fy = subst (λ k → * s ≡ k ) y=fy ( fc00 zero zero refl (init as) cy i=x i=y ) | |
| 130 fc00 zero zero refl (fsuc x cx) (init as) i=x i=y with proj1 (mf x (A∋fc s f mf cx ) ) | |
| 131 ... | case1 x=fx = subst (λ k → k ≡ * s ) x=fx ( fc00 zero zero refl cx (init as) i=x i=y ) | |
| 559 | 132 fc00 zero zero refl (fsuc x cx) (fsuc y cy) i=x i=y with proj1 (mf x (A∋fc s f mf cx ) ) | proj1 (mf y (A∋fc s f mf cy ) ) |
| 133 ... | case1 x=fx | case1 y=fy = subst₂ (λ j k → j ≡ k ) x=fx y=fy ( fc00 zero zero refl cx cy i=x i=y ) | |
| 134 fc00 (suc i) (suc j) i=j {.(f x)} {.(f y)} (fsuc x cx) (fsuc y cy) i=x j=y with proj1 (mf x (A∋fc s f mf cx ) ) | proj1 (mf y (A∋fc s f mf cy ) ) | |
| 135 ... | case1 x=fx | case1 y=fy = subst₂ (λ j k → j ≡ k ) x=fx y=fy ( fc00 (suc i) (suc j) i=j cx cy i=x j=y ) | |
| 136 ... | case1 x=fx | case2 y<fy = subst (λ k → k ≡ * (f y)) x=fx (fc02 x cx i=x) where | |
| 137 fc02 : (x1 : Ordinal) → (cx1 : FClosure A f s x1 ) → suc i ≡ fcn s mf cx1 → * x1 ≡ * (f y) | |
| 138 fc02 .(f x1) (fsuc x1 cx1) i=x1 with proj1 (mf x1 (A∋fc s f mf cx1 ) ) | |
| 560 | 139 ... | case1 eq = trans (sym eq) ( fc02 x1 cx1 i=x1 ) -- derefence while f x ≡ x |
| 559 | 140 ... | case2 lt = subst₂ (λ j k → * (f j) ≡ * (f k )) &iso &iso ( cong (λ k → * ( f (& k ))) fc04) where |
| 141 fc04 : * x1 ≡ * y | |
| 142 fc04 = fc00 i j (cong pred i=j) cx1 cy (cong pred i=x1) (cong pred j=y) | |
| 143 ... | case2 x<fx | case1 y=fy = subst (λ k → * (f x) ≡ k ) y=fy (fc03 y cy j=y) where | |
| 144 fc03 : (y1 : Ordinal) → (cy1 : FClosure A f s y1 ) → suc j ≡ fcn s mf cy1 → * (f x) ≡ * y1 | |
| 145 fc03 .(f y1) (fsuc y1 cy1) j=y1 with proj1 (mf y1 (A∋fc s f mf cy1 ) ) | |
| 146 ... | case1 eq = trans ( fc03 y1 cy1 j=y1 ) eq | |
| 147 ... | case2 lt = subst₂ (λ j k → * (f j) ≡ * (f k )) &iso &iso ( cong (λ k → * ( f (& k ))) fc05) where | |
| 148 fc05 : * x ≡ * y1 | |
| 149 fc05 = fc00 i j (cong pred i=j) cx cy1 (cong pred i=x) (cong pred j=y1) | |
| 150 ... | case2 x₁ | case2 x₂ = subst₂ (λ j k → * (f j) ≡ * (f k) ) &iso &iso (cong (λ k → * (f (& k))) (fc00 i j (cong pred i=j) cx cy (cong pred i=x) (cong pred j=y))) | |
| 557 | 151 |
| 600 | 152 |
| 557 | 153 fcn-< : {A : HOD} (s : Ordinal ) { x y : Ordinal} {f : Ordinal → Ordinal} → (mf : ≤-monotonic-f A f) |
| 154 → (cx : FClosure A f s x ) (cy : FClosure A f s y ) → fcn s mf cx Data.Nat.< fcn s mf cy → * x < * y | |
| 558 | 155 fcn-< {A} s {x} {y} {f} mf cx cy x<y = fc01 (fcn s mf cy) cx cy refl x<y where |
| 156 fc01 : (i : ℕ ) → {y : Ordinal } → (cx : FClosure A f s x ) (cy : FClosure A f s y ) → (i ≡ fcn s mf cy ) → fcn s mf cx Data.Nat.< i → * x < * y | |
| 157 fc01 (suc i) {y} cx (fsuc y1 cy) i=y (s≤s x<i) with proj1 (mf y1 (A∋fc s f mf cy ) ) | |
| 158 ... | case1 y=fy = subst (λ k → * x < k ) y=fy ( fc01 (suc i) {y1} cx cy i=y (s≤s x<i) ) | |
| 159 ... | case2 y<fy with <-cmp (fcn s mf cx ) i | |
| 160 ... | tri> ¬a ¬b c = ⊥-elim ( nat-≤> x<i c ) | |
| 161 ... | tri≈ ¬a b ¬c = subst (λ k → k < * (f y1) ) (fcn-inject s mf cy cx (sym (trans b (cong pred i=y) ))) y<fy | |
| 162 ... | tri< a ¬b ¬c = IsStrictPartialOrder.trans PO fc02 y<fy where | |
| 163 fc03 : suc i ≡ suc (fcn s mf cy) → i ≡ fcn s mf cy | |
| 164 fc03 eq = cong pred eq | |
| 165 fc02 : * x < * y1 | |
| 166 fc02 = fc01 i cx cy (fc03 i=y ) a | |
| 557 | 167 |
| 559 | 168 fcn-cmp : {A : HOD} (s : Ordinal) { x y : Ordinal } (f : Ordinal → Ordinal) (mf : ≤-monotonic-f A f) |
| 554 | 169 → (cx : FClosure A f s x) → (cy : FClosure A f s y ) → Tri (* x < * y) (* x ≡ * y) (* y < * x ) |
| 559 | 170 fcn-cmp {A} s {x} {y} f mf cx cy with <-cmp ( fcn s mf cx ) (fcn s mf cy ) |
| 171 ... | tri< a ¬b ¬c = tri< fc11 (λ eq → <-irr (case1 (sym eq)) fc11) (λ lt → <-irr (case2 fc11) lt) where | |
| 172 fc11 : * x < * y | |
| 173 fc11 = fcn-< {A} s {x} {y} {f} mf cx cy a | |
| 174 ... | tri≈ ¬a b ¬c = tri≈ (λ lt → <-irr (case1 (sym fc10)) lt) fc10 (λ lt → <-irr (case1 fc10) lt) where | |
| 175 fc10 : * x ≡ * y | |
| 176 fc10 = fcn-inject {A} s {x} {y} {f} mf cx cy b | |
| 177 ... | tri> ¬a ¬b c = tri> (λ lt → <-irr (case2 fc12) lt) (λ eq → <-irr (case1 eq) fc12) fc12 where | |
| 178 fc12 : * y < * x | |
| 179 fc12 = fcn-< {A} s {y} {x} {f} mf cy cx c | |
| 180 | |
| 600 | 181 |
| 562 | 182 fcn-imm : {A : HOD} (s : Ordinal) { x y : Ordinal } (f : Ordinal → Ordinal) (mf : ≤-monotonic-f A f) |
| 183 → (cx : FClosure A f s x) → (cy : FClosure A f s y ) → ¬ ( ( * x < * y ) ∧ ( * y < * (f x )) ) | |
| 563 | 184 fcn-imm {A} s {x} {y} f mf cx cy ⟪ x<y , y<fx ⟫ = fc21 where |
| 185 fc20 : fcn s mf cy Data.Nat.< suc (fcn s mf cx) → (fcn s mf cy ≡ fcn s mf cx) ∨ ( fcn s mf cy Data.Nat.< fcn s mf cx ) | |
| 186 fc20 y<sx with <-cmp ( fcn s mf cy ) (fcn s mf cx ) | |
| 187 ... | tri< a ¬b ¬c = case2 a | |
| 188 ... | tri≈ ¬a b ¬c = case1 b | |
| 189 ... | tri> ¬a ¬b c = ⊥-elim ( nat-≤> y<sx (s≤s c)) | |
| 190 fc17 : {x y : Ordinal } → (cx : FClosure A f s x) → (cy : FClosure A f s y ) → suc (fcn s mf cx) ≡ fcn s mf cy → * (f x ) ≡ * y | |
| 191 fc17 {x} {y} cx cy sx=y = fc18 (fcn s mf cy) cx cy refl sx=y where | |
| 192 fc18 : (i : ℕ ) → {y : Ordinal } → (cx : FClosure A f s x ) (cy : FClosure A f s y ) → (i ≡ fcn s mf cy ) → suc (fcn s mf cx) ≡ i → * (f x) ≡ * y | |
| 193 fc18 (suc i) {y} cx (fsuc y1 cy) i=y sx=i with proj1 (mf y1 (A∋fc s f mf cy ) ) | |
| 194 ... | case1 y=fy = subst (λ k → * (f x) ≡ k ) y=fy ( fc18 (suc i) {y1} cx cy i=y sx=i) -- dereference | |
| 195 ... | case2 y<fy = subst₂ (λ j k → * (f j) ≡ * (f k) ) &iso &iso (cong (λ k → * (f (& k) ) ) fc19) where | |
| 196 fc19 : * x ≡ * y1 | |
| 197 fc19 = fcn-inject s mf cx cy (cong pred ( trans sx=i i=y )) | |
| 198 fc21 : ⊥ | |
| 199 fc21 with <-cmp (suc ( fcn s mf cx )) (fcn s mf cy ) | |
| 200 ... | tri< a ¬b ¬c = <-irr (case2 y<fx) (fc22 a) where -- suc ncx < ncy | |
| 201 cxx : FClosure A f s (f x) | |
| 202 cxx = fsuc x cx | |
| 203 fc16 : (x : Ordinal ) → (cx : FClosure A f s x) → (fcn s mf cx ≡ fcn s mf (fsuc x cx)) ∨ ( suc (fcn s mf cx ) ≡ fcn s mf (fsuc x cx)) | |
| 600 | 204 fc16 x (init as) with proj1 (mf s as ) |
| 563 | 205 ... | case1 _ = case1 refl |
| 206 ... | case2 _ = case2 refl | |
| 207 fc16 .(f x) (fsuc x cx ) with proj1 (mf (f x) (A∋fc s f mf (fsuc x cx)) ) | |
| 208 ... | case1 _ = case1 refl | |
| 209 ... | case2 _ = case2 refl | |
| 210 fc22 : (suc ( fcn s mf cx )) Data.Nat.< (fcn s mf cy ) → * (f x) < * y | |
| 211 fc22 a with fc16 x cx | |
| 212 ... | case1 eq = fcn-< s mf cxx cy (subst (λ k → k Data.Nat.< fcn s mf cy ) eq (<-trans a<sa a)) | |
| 213 ... | case2 eq = fcn-< s mf cxx cy (subst (λ k → k Data.Nat.< fcn s mf cy ) eq a ) | |
| 214 ... | tri≈ ¬a b ¬c = <-irr (case1 (fc17 cx cy b)) y<fx | |
| 215 ... | tri> ¬a ¬b c with fc20 c -- ncy < suc ncx | |
| 216 ... | case1 y=x = <-irr (case1 ( fcn-inject s mf cy cx y=x )) x<y | |
| 217 ... | case2 y<x = <-irr (case2 x<y) (fcn-< s mf cy cx y<x ) | |
| 218 | |
| 729 | 219 fc-conv : (A : HOD ) (f : Ordinal → Ordinal) {b u : Ordinal } |
| 220 → {p0 p1 : Ordinal → Ordinal} | |
| 221 → p0 u ≡ p1 u | |
| 222 → FClosure A f (p0 u) b → FClosure A f (p1 u) b | |
| 223 fc-conv A f {.(p0 u)} {u} {p0} {p1} p0u=p1u (init ap0u) = subst (λ k → FClosure A f (p1 u) k) (sym p0u=p1u) | |
| 224 ( init (subst (λ k → odef A k) p0u=p1u ap0u )) | |
| 225 fc-conv A f {_} {u} {p0} {p1} p0u=p1u (fsuc z fc) = fsuc z (fc-conv A f {_} {u} {p0} {p1} p0u=p1u fc) | |
| 226 | |
| 560 | 227 -- open import Relation.Binary.Properties.Poset as Poset |
| 228 | |
| 229 IsTotalOrderSet : ( A : HOD ) → Set (Level.suc n) | |
| 230 IsTotalOrderSet A = {a b : HOD} → odef A (& a) → odef A (& b) → Tri (a < b) (a ≡ b) (b < a ) | |
| 231 | |
| 567 | 232 ⊆-IsTotalOrderSet : { A B : HOD } → B ⊆ A → IsTotalOrderSet A → IsTotalOrderSet B |
| 568 | 233 ⊆-IsTotalOrderSet {A} {B} B⊆A T ax ay = T (incl B⊆A ax) (incl B⊆A ay) |
| 567 | 234 |
| 568 | 235 _⊆'_ : ( A B : HOD ) → Set n |
| 236 _⊆'_ A B = {x : Ordinal } → odef A x → odef B x | |
| 560 | 237 |
| 238 -- | |
| 239 -- inductive maxmum tree from x | |
| 240 -- tree structure | |
| 241 -- | |
| 554 | 242 |
| 567 | 243 record HasPrev (A B : HOD) {x : Ordinal } (xa : odef A x) ( f : Ordinal → Ordinal ) : Set n where |
| 533 | 244 field |
| 534 | 245 y : Ordinal |
| 541 | 246 ay : odef B y |
| 534 | 247 x=fy : x ≡ f y |
| 529 | 248 |
| 570 | 249 record IsSup (A B : HOD) {x : Ordinal } (xa : odef A x) : Set n where |
| 654 | 250 field |
| 571 | 251 x<sup : {y : Ordinal} → odef B y → (y ≡ x ) ∨ (y << x ) |
| 568 | 252 |
| 656 | 253 record SUP ( A B : HOD ) : Set (Level.suc n) where |
| 254 field | |
| 255 sup : HOD | |
| 256 A∋maximal : A ∋ sup | |
| 257 x<sup : {x : HOD} → B ∋ x → (x ≡ sup ) ∨ (x < sup ) -- B is Total, use positive | |
| 258 | |
| 690 | 259 -- |
| 260 -- sup and its fclosure is in a chain HOD | |
| 261 -- chain HOD is sorted by sup as Ordinal and <-ordered | |
| 262 -- whole chain is a union of separated Chain | |
| 263 -- minimum index is y not ϕ | |
| 264 -- | |
| 265 | |
| 714 | 266 record ChainP (A : HOD ) ( f : Ordinal → Ordinal ) (mf : ≤-monotonic-f A f) {y : Ordinal} (ay : odef A y) (supf : Ordinal → Ordinal) (u z : Ordinal) : Set n where |
| 690 | 267 field |
| 739 | 268 csupz : FClosure A f (supf u) z |
| 756 | 269 supfu=u : supf u ≡ u |
| 765 | 270 fcy<sup : {z : Ordinal } → FClosure A f y z → (z ≡ supf u) ∨ ( z << supf u ) |
| 769 | 271 order : {sup1 z1 : Ordinal} → (lt : supf sup1 o< supf u ) → FClosure A f (supf sup1 ) z1 → (z1 ≡ supf u ) ∨ ( z1 << supf u ) |
| 694 | 272 |
| 273 -- Union of supf z which o< x | |
| 274 -- | |
| 690 | 275 |
| 748 | 276 data UChain ( A : HOD ) ( f : Ordinal → Ordinal ) (mf : ≤-monotonic-f A f) {y : Ordinal } (ay : odef A y ) |
| 277 (supf : Ordinal → Ordinal) (x : Ordinal) : (z : Ordinal) → Set n where | |
| 278 ch-init : {z : Ordinal } (fc : FClosure A f y z) → UChain A f mf ay supf x z | |
| 764 | 279 ch-is-sup : (u : Ordinal) {z : Ordinal } ( is-sup : ChainP A f mf ay supf u z) |
| 748 | 280 ( fc : FClosure A f (supf u) z ) → UChain A f mf ay supf x z |
| 694 | 281 |
| 282 ∈∧P→o< : {A : HOD } {y : Ordinal} → {P : Set n} → odef A y ∧ P → y o< & A | |
| 283 ∈∧P→o< {A } {y} p = subst (λ k → k o< & A) &iso ( c<→o< (subst (λ k → odef A k ) (sym &iso ) (proj1 p ))) | |
| 284 | |
| 285 UnionCF : ( A : HOD ) ( f : Ordinal → Ordinal ) (mf : ≤-monotonic-f A f) {y : Ordinal } (ay : odef A y ) | |
| 286 ( supf : Ordinal → Ordinal ) ( x : Ordinal ) → HOD | |
| 287 UnionCF A f mf ay supf x | |
| 288 = record { od = record { def = λ z → odef A z ∧ UChain A f mf ay supf x z } ; odmax = & A ; <odmax = λ {y} sy → ∈∧P→o< sy } | |
| 662 | 289 |
| 703 | 290 record ZChain ( A : HOD ) ( f : Ordinal → Ordinal ) (mf : ≤-monotonic-f A f) |
| 291 {init : Ordinal} (ay : odef A init) ( z : Ordinal ) : Set (Level.suc n) where | |
| 655 | 292 field |
| 694 | 293 supf : Ordinal → Ordinal |
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294 chain : HOD |
| 703 | 295 chain = UnionCF A f mf ay supf z |
| 568 | 296 field |
| 297 chain⊆A : chain ⊆' A | |
| 653 | 298 chain∋init : odef chain init |
| 299 initial : {y : Ordinal } → odef chain y → * init ≤ * y | |
| 568 | 300 f-next : {a : Ordinal } → odef chain a → odef chain (f a) |
| 654 | 301 f-total : IsTotalOrderSet chain |
| 756 | 302 |
| 769 | 303 supf-mono : { a b : Ordinal } → a o< b → supf a o≤ supf b |
| 754 | 304 csupf : {z : Ordinal } → odef chain (supf z) |
| 761 | 305 sup=u : {b : Ordinal} → (ab : odef A b) → b o< z → IsSup A (UnionCF A f mf ay supf (osuc b)) ab → supf b ≡ b |
| 765 | 306 fcy<sup : {u w : Ordinal } → u o< z → FClosure A f init w → (w ≡ supf u ) ∨ ( w << supf u ) -- different from order because y o< supf |
| 769 | 307 order : {b sup1 z1 : Ordinal} → b o< z → supf sup1 o< supf b → FClosure A f (supf sup1) z1 → (z1 ≡ supf b) ∨ (z1 << supf b) |
| 756 | 308 |
| 653 | 309 |
| 728 | 310 record ZChain1 ( A : HOD ) ( f : Ordinal → Ordinal ) (mf : ≤-monotonic-f A f) |
| 311 {init : Ordinal} (ay : odef A init) (zc : ZChain A f mf ay (& A)) ( z : Ordinal ) : Set (Level.suc n) where | |
| 312 field | |
| 313 is-max : {a b : Ordinal } → (ca : odef (UnionCF A f mf ay (ZChain.supf zc) z) a ) → b o< z → (ab : odef A b) | |
| 314 → HasPrev A (UnionCF A f mf ay (ZChain.supf zc) z) ab f ∨ IsSup A (UnionCF A f mf ay (ZChain.supf zc) z) ab | |
| 315 → * a < * b → odef ((UnionCF A f mf ay (ZChain.supf zc) z)) b | |
| 316 | |
| 568 | 317 record Maximal ( A : HOD ) : Set (Level.suc n) where |
| 318 field | |
| 319 maximal : HOD | |
| 320 A∋maximal : A ∋ maximal | |
| 321 ¬maximal<x : {x : HOD} → A ∋ x → ¬ maximal < x -- A is Partial, use negative | |
| 567 | 322 |
| 748 | 323 -- data UChain is total |
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324 |
| 694 | 325 chain-total : (A : HOD ) ( f : Ordinal → Ordinal ) (mf : ≤-monotonic-f A f) {y : Ordinal} (ay : odef A y) (supf : Ordinal → Ordinal ) |
| 748 | 326 {s s1 a b : Ordinal } ( ca : UChain A f mf ay supf s a ) ( cb : UChain A f mf ay supf s1 b ) → Tri (* a < * b) (* a ≡ * b) (* b < * a ) |
| 694 | 327 chain-total A f mf {y} ay supf {xa} {xb} {a} {b} ca cb = ct-ind xa xb ca cb where |
| 748 | 328 ct-ind : (xa xb : Ordinal) → {a b : Ordinal} → UChain A f mf ay supf xa a → UChain A f mf ay supf xb b → Tri (* a < * b) (* a ≡ * b) (* b < * a) |
| 329 ct-ind xa xb {a} {b} (ch-init fca) (ch-init fcb) = fcn-cmp y f mf fca fcb | |
| 765 | 330 ct-ind xa xb {a} {b} (ch-init fca) (ch-is-sup ub supb fcb) with ChainP.fcy<sup supb fca |
| 766 | 331 ... | case1 eq with s≤fc (supf ub) f mf fcb |
| 332 ... | case1 eq1 = tri≈ (λ lt → ⊥-elim (<-irr (case1 (sym ct00)) lt)) ct00 (λ lt → ⊥-elim (<-irr (case1 ct00) lt)) where | |
| 333 ct00 : * a ≡ * b | |
| 334 ct00 = trans (cong (*) eq) eq1 | |
| 765 | 335 ... | case2 lt = tri< ct01 (λ eq → <-irr (case1 (sym eq)) ct01) (λ lt → <-irr (case2 ct01) lt) where |
| 766 | 336 ct01 : * a < * b |
| 337 ct01 = subst (λ k → * k < * b ) (sym eq) lt | |
| 338 ct-ind xa xb {a} {b} (ch-init fca) (ch-is-sup ub supb fcb) | case2 lt = tri< ct01 (λ eq → <-irr (case1 (sym eq)) ct01) (λ lt → <-irr (case2 ct01) lt) where | |
| 748 | 339 ct00 : * a < * (supf ub) |
| 765 | 340 ct00 = lt |
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341 ct01 : * a < * b |
| 748 | 342 ct01 with s≤fc (supf ub) f mf fcb |
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343 ... | case1 eq = subst (λ k → * a < k ) eq ct00 |
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344 ... | case2 lt = IsStrictPartialOrder.trans POO ct00 lt |
| 765 | 345 ct-ind xa xb {a} {b} (ch-is-sup ua supa fca) (ch-init fcb) with ChainP.fcy<sup supa fcb |
| 766 | 346 ... | case1 eq with s≤fc (supf ua) f mf fca |
| 347 ... | case1 eq1 = tri≈ (λ lt → ⊥-elim (<-irr (case1 (sym ct00)) lt)) ct00 (λ lt → ⊥-elim (<-irr (case1 ct00) lt)) where | |
| 348 ct00 : * a ≡ * b | |
| 349 ct00 = sym (trans (cong (*) eq) eq1 ) | |
| 765 | 350 ... | case2 lt = tri> (λ lt → <-irr (case2 ct01) lt) (λ eq → <-irr (case1 eq) ct01) ct01 where |
| 766 | 351 ct01 : * b < * a |
| 352 ct01 = subst (λ k → * k < * a ) (sym eq) lt | |
| 353 ct-ind xa xb {a} {b} (ch-is-sup ua supa fca) (ch-init fcb) | case2 lt = tri> (λ lt → <-irr (case2 ct01) lt) (λ eq → <-irr (case1 eq) ct01) ct01 where | |
| 749 | 354 ct00 : * b < * (supf ua) |
| 765 | 355 ct00 = lt |
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356 ct01 : * b < * a |
| 749 | 357 ct01 with s≤fc (supf ua) f mf fca |
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358 ... | case1 eq = subst (λ k → * b < k ) eq ct00 |
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359 ... | case2 lt = IsStrictPartialOrder.trans POO ct00 lt |
| 769 | 360 ct-ind xa xb {a} {b} (ch-is-sup ua supa fca) (ch-is-sup ub supb fcb) with trio< (supf ua) (supf ub) |
| 765 | 361 ... | tri< a₁ ¬b ¬c with ChainP.order supb a₁ (ChainP.csupz supa) |
| 766 | 362 ... | case1 eq with s≤fc (supf ub) f mf fcb |
| 363 ... | case1 eq1 = tri≈ (λ lt → ⊥-elim (<-irr (case1 (sym ct00)) lt)) ct00 (λ lt → ⊥-elim (<-irr (case1 ct00) lt)) where | |
| 364 ct00 : * a ≡ * b | |
| 365 ct00 = trans (cong (*) eq) eq1 | |
| 366 ... | case2 lt = tri< ct02 (λ eq → <-irr (case1 (sym eq)) ct02) (λ lt → <-irr (case2 ct02) lt) where | |
| 367 ct02 : * a < * b | |
| 368 ct02 = subst (λ k → * k < * b ) (sym eq) lt | |
| 369 ct-ind xa xb {a} {b} (ch-is-sup ua supa fca) (ch-is-sup ub supb fcb) | tri< a₁ ¬b ¬c | case2 lt = tri< ct02 (λ eq → <-irr (case1 (sym eq)) ct02) (λ lt → <-irr (case2 ct02) lt) where | |
| 748 | 370 ct03 : * a < * (supf ub) |
| 765 | 371 ct03 = lt |
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372 ct02 : * a < * b |
| 748 | 373 ct02 with s≤fc (supf ub) f mf fcb |
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374 ... | case1 eq = subst (λ k → * a < k ) eq ct03 |
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375 ... | case2 lt = IsStrictPartialOrder.trans POO ct03 lt |
| 769 | 376 ct-ind xa xb {a} {b} (ch-is-sup ua supa fca) (ch-is-sup ub supb fcb) | tri≈ ¬a eq ¬c |
| 377 = fcn-cmp (supf ua) f mf fca (subst (λ k → FClosure A f k b ) (sym eq) fcb ) | |
| 765 | 378 ct-ind xa xb {a} {b} (ch-is-sup ua supa fca) (ch-is-sup ub supb fcb) | tri> ¬a ¬b c with ChainP.order supa c (ChainP.csupz supb) |
| 766 | 379 ... | case1 eq with s≤fc (supf ua) f mf fca |
| 380 ... | case1 eq1 = tri≈ (λ lt → ⊥-elim (<-irr (case1 (sym ct00)) lt)) ct00 (λ lt → ⊥-elim (<-irr (case1 ct00) lt)) where | |
| 381 ct00 : * a ≡ * b | |
| 382 ct00 = sym (trans (cong (*) eq) eq1) | |
| 383 ... | case2 lt = tri> (λ lt → <-irr (case2 ct02) lt) (λ eq → <-irr (case1 eq) ct02) ct02 where | |
| 384 ct02 : * b < * a | |
| 385 ct02 = subst (λ k → * k < * a ) (sym eq) lt | |
| 386 ct-ind xa xb {a} {b} (ch-is-sup ua supa fca) (ch-is-sup ub supb fcb) | tri> ¬a ¬b c | case2 lt = tri> (λ lt → <-irr (case2 ct04) lt) (λ eq → <-irr (case1 (eq)) ct04) ct04 where | |
| 749 | 387 ct05 : * b < * (supf ua) |
| 765 | 388 ct05 = lt |
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389 ct04 : * b < * a |
| 749 | 390 ct04 with s≤fc (supf ua) f mf fca |
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391 ... | case1 eq = subst (λ k → * b < k ) eq ct05 |
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392 ... | case2 lt = IsStrictPartialOrder.trans POO ct05 lt |
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parents:
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393 |
| 743 | 394 init-uchain : (A : HOD) ( f : Ordinal → Ordinal ) (mf : ≤-monotonic-f A f) {y : Ordinal } → (ay : odef A y ) |
| 395 { supf : Ordinal → Ordinal } { x : Ordinal } → odef (UnionCF A f mf ay supf x) y | |
| 748 | 396 init-uchain A f mf ay = ⟪ ay , ch-init (init ay) ⟫ |
| 743 | 397 |
| 698 | 398 ChainP-next : (A : HOD ) ( f : Ordinal → Ordinal ) (mf : ≤-monotonic-f A f) {y : Ordinal} (ay : odef A y) (supf : Ordinal → Ordinal ) |
| 399 → {x z : Ordinal } → ChainP A f mf ay supf x z → ChainP A f mf ay supf x (f z ) | |
| 756 | 400 ChainP-next A f mf {y} ay supf {x} {z} cp = record { supfu=u = ChainP.supfu=u cp |
| 746 | 401 ; fcy<sup = ChainP.fcy<sup cp ; csupz = fsuc _ (ChainP.csupz cp) ; order = ChainP.order cp } |
| 698 | 402 |
| 497 | 403 Zorn-lemma : { A : HOD } |
| 464 | 404 → o∅ o< & A |
| 568 | 405 → ( ( B : HOD) → (B⊆A : B ⊆' A) → IsTotalOrderSet B → SUP A B ) -- SUP condition |
| 497 | 406 → Maximal A |
| 552 | 407 Zorn-lemma {A} 0<A supP = zorn00 where |
| 571 | 408 <-irr0 : {a b : HOD} → A ∋ a → A ∋ b → (a ≡ b ) ∨ (a < b ) → b < a → ⊥ |
| 409 <-irr0 {a} {b} A∋a A∋b = <-irr | |
| 537 | 410 z07 : {y : Ordinal} → {P : Set n} → odef A y ∧ P → y o< & A |
| 411 z07 {y} p = subst (λ k → k o< & A) &iso ( c<→o< (subst (λ k → odef A k ) (sym &iso ) (proj1 p ))) | |
| 760 | 412 z09 : {b : Ordinal } { A : HOD } → odef A b → b o< & A |
| 413 z09 {b} {A} ab = subst (λ k → k o< & A) &iso ( c<→o< (subst (λ k → odef A k ) (sym &iso ) ab)) | |
| 530 | 414 s : HOD |
| 415 s = ODC.minimal O A (λ eq → ¬x<0 ( subst (λ k → o∅ o< k ) (=od∅→≡o∅ eq) 0<A )) | |
| 568 | 416 as : A ∋ * ( & s ) |
| 417 as = subst (λ k → odef A (& k) ) (sym *iso) ( ODC.x∋minimal O A (λ eq → ¬x<0 ( subst (λ k → o∅ o< k ) (=od∅→≡o∅ eq) 0<A )) ) | |
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parents:
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418 as0 : odef A (& s ) |
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419 as0 = subst (λ k → odef A k ) &iso as |
| 547 | 420 s<A : & s o< & A |
| 568 | 421 s<A = c<→o< (subst (λ k → odef A (& k) ) *iso as ) |
| 530 | 422 HasMaximal : HOD |
| 537 | 423 HasMaximal = record { od = record { def = λ x → odef A x ∧ ( (m : Ordinal) → odef A m → ¬ (* x < * m)) } ; odmax = & A ; <odmax = z07 } |
| 424 no-maximum : HasMaximal =h= od∅ → (x : Ordinal) → odef A x ∧ ((m : Ordinal) → odef A m → odef A x ∧ (¬ (* x < * m) )) → ⊥ | |
| 425 no-maximum nomx x P = ¬x<0 (eq→ nomx {x} ⟪ proj1 P , (λ m ma p → proj2 ( proj2 P m ma ) p ) ⟫ ) | |
| 532 | 426 Gtx : { x : HOD} → A ∋ x → HOD |
| 537 | 427 Gtx {x} ax = record { od = record { def = λ y → odef A y ∧ (x < (* y)) } ; odmax = & A ; <odmax = z07 } |
| 428 z08 : ¬ Maximal A → HasMaximal =h= od∅ | |
| 429 z08 nmx = record { eq→ = λ {x} lt → ⊥-elim ( nmx record {maximal = * x ; A∋maximal = subst (λ k → odef A k) (sym &iso) (proj1 lt) | |
| 430 ; ¬maximal<x = λ {y} ay → subst (λ k → ¬ (* x < k)) *iso (proj2 lt (& y) ay) } ) ; eq← = λ {y} lt → ⊥-elim ( ¬x<0 lt )} | |
| 431 x-is-maximal : ¬ Maximal A → {x : Ordinal} → (ax : odef A x) → & (Gtx (subst (λ k → odef A k ) (sym &iso) ax)) ≡ o∅ → (m : Ordinal) → odef A m → odef A x ∧ (¬ (* x < * m)) | |
| 432 x-is-maximal nmx {x} ax nogt m am = ⟪ subst (λ k → odef A k) &iso (subst (λ k → odef A k ) (sym &iso) ax) , ¬x<m ⟫ where | |
| 433 ¬x<m : ¬ (* x < * m) | |
| 434 ¬x<m x<m = ∅< {Gtx (subst (λ k → odef A k ) (sym &iso) ax)} {* m} ⟪ subst (λ k → odef A k) (sym &iso) am , subst (λ k → * x < k ) (cong (*) (sym &iso)) x<m ⟫ (≡o∅→=od∅ nogt) | |
| 543 | 435 |
| 560 | 436 -- Uncountable ascending chain by axiom of choice |
| 530 | 437 cf : ¬ Maximal A → Ordinal → Ordinal |
| 532 | 438 cf nmx x with ODC.∋-p O A (* x) |
| 439 ... | no _ = o∅ | |
| 440 ... | yes ax with is-o∅ (& ( Gtx ax )) | |
| 538 | 441 ... | yes nogt = -- no larger element, so it is maximal |
| 442 ⊥-elim (no-maximum (z08 nmx) x ⟪ subst (λ k → odef A k) &iso ax , x-is-maximal nmx (subst (λ k → odef A k ) &iso ax) nogt ⟫ ) | |
| 532 | 443 ... | no not = & (ODC.minimal O (Gtx ax) (λ eq → not (=od∅→≡o∅ eq))) |
| 537 | 444 is-cf : (nmx : ¬ Maximal A ) → {x : Ordinal} → odef A x → odef A (cf nmx x) ∧ ( * x < * (cf nmx x) ) |
| 445 is-cf nmx {x} ax with ODC.∋-p O A (* x) | |
| 446 ... | no not = ⊥-elim ( not (subst (λ k → odef A k ) (sym &iso) ax )) | |
| 447 ... | yes ax with is-o∅ (& ( Gtx ax )) | |
| 448 ... | yes nogt = ⊥-elim (no-maximum (z08 nmx) x ⟪ subst (λ k → odef A k) &iso ax , x-is-maximal nmx (subst (λ k → odef A k ) &iso ax) nogt ⟫ ) | |
| 449 ... | no not = ODC.x∋minimal O (Gtx ax) (λ eq → not (=od∅→≡o∅ eq)) | |
| 606 | 450 |
| 451 --- | |
| 452 --- infintie ascention sequence of f | |
| 453 --- | |
| 530 | 454 cf-is-<-monotonic : (nmx : ¬ Maximal A ) → (x : Ordinal) → odef A x → ( * x < * (cf nmx x) ) ∧ odef A (cf nmx x ) |
| 537 | 455 cf-is-<-monotonic nmx x ax = ⟪ proj2 (is-cf nmx ax ) , proj1 (is-cf nmx ax ) ⟫ |
| 530 | 456 cf-is-≤-monotonic : (nmx : ¬ Maximal A ) → ≤-monotonic-f A ( cf nmx ) |
| 532 | 457 cf-is-≤-monotonic nmx x ax = ⟪ case2 (proj1 ( cf-is-<-monotonic nmx x ax )) , proj2 ( cf-is-<-monotonic nmx x ax ) ⟫ |
| 543 | 458 |
| 703 | 459 sp0 : ( f : Ordinal → Ordinal ) → (mf : ≤-monotonic-f A f ) (zc : ZChain A f mf as0 (& A) ) |
| 653 | 460 (total : IsTotalOrderSet (ZChain.chain zc) ) → SUP A (ZChain.chain zc) |
| 703 | 461 sp0 f mf zc total = supP (ZChain.chain zc) (ZChain.chain⊆A zc) total |
| 543 | 462 zc< : {x y z : Ordinal} → {P : Set n} → (x o< y → P) → x o< z → z o< y → P |
| 463 zc< {x} {y} {z} {P} prev x<z z<y = prev (ordtrans x<z z<y) | |
| 464 | |
| 728 | 465 SZ1 :( A : HOD ) ( f : Ordinal → Ordinal ) (mf : ≤-monotonic-f A f) |
| 466 {init : Ordinal} (ay : odef A init) (zc : ZChain A f mf ay (& A)) (x : Ordinal) → ZChain1 A f mf ay zc x | |
| 467 SZ1 A f mf {y} ay zc x = TransFinite { λ x → ZChain1 A f mf ay zc x } zc1 x where | |
| 734 | 468 chain-mono2 : (x : Ordinal) {a b c : Ordinal} → a o≤ b → b o≤ x → |
| 469 odef (UnionCF A f mf ay (ZChain.supf zc) a) c → odef (UnionCF A f mf ay (ZChain.supf zc) b) c | |
| 748 | 470 chain-mono2 x {a} {b} {c} a≤b b≤x ⟪ ua , ch-init fc ⟫ = |
| 471 ⟪ ua , ch-init fc ⟫ | |
| 764 | 472 chain-mono2 x {a} {b} {c} a≤b b≤x ⟪ uaa , ch-is-sup ua is-sup fc ⟫ = |
| 473 ⟪ uaa , ch-is-sup ua is-sup fc ⟫ | |
| 743 | 474 chain<ZA : {x : Ordinal } → UnionCF A f mf ay (ZChain.supf zc) x ⊆' UnionCF A f mf ay (ZChain.supf zc) (& A) |
| 748 | 475 chain<ZA {x} ux with proj2 ux |
| 476 ... | ch-init fc = ⟪ proj1 ux , ch-init fc ⟫ | |
| 764 | 477 ... | ch-is-sup u is-sup fc = ⟪ proj1 ux , ch-is-sup u is-sup fc ⟫ |
| 735 | 478 is-max-hp : (x : Ordinal) {a : Ordinal} {b : Ordinal} → odef (UnionCF A f mf ay (ZChain.supf zc) x) a → |
| 479 b o< x → (ab : odef A b) → | |
| 480 HasPrev A (UnionCF A f mf ay (ZChain.supf zc) x) ab f → | |
| 481 * a < * b → odef (UnionCF A f mf ay (ZChain.supf zc) x) b | |
| 749 | 482 is-max-hp x {a} {b} ua b<x ab has-prev a<b with HasPrev.ay has-prev |
| 483 ... | ⟪ ab0 , ch-init fc ⟫ = ⟪ ab , ch-init ( subst (λ k → FClosure A f y k) (sym (HasPrev.x=fy has-prev)) (fsuc _ fc )) ⟫ | |
| 764 | 484 ... | ⟪ ab0 , ch-is-sup u is-sup fc ⟫ = ⟪ ab , |
| 749 | 485 subst (λ k → UChain A f mf ay (ZChain.supf zc) x k ) |
| 764 | 486 (sym (HasPrev.x=fy has-prev)) ( ch-is-sup u (ChainP-next A f mf ay _ is-sup) (fsuc _ fc)) ⟫ |
| 728 | 487 zc1 : (x : Ordinal) → ((y₁ : Ordinal) → y₁ o< x → ZChain1 A f mf ay zc y₁) → ZChain1 A f mf ay zc x |
|
732
ddeb107b6f71
bchain can be reached from upwords by f. so it is worng.
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents:
729
diff
changeset
|
488 zc1 x prev with Oprev-p x |
| 756 | 489 ... | yes op = record { is-max = is-max } where |
|
732
ddeb107b6f71
bchain can be reached from upwords by f. so it is worng.
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents:
729
diff
changeset
|
490 px = Oprev.oprev op |
| 735 | 491 zc-b<x : (b : Ordinal ) → b o< x → b o< osuc px |
| 492 zc-b<x b lt = subst (λ k → b o< k ) (sym (Oprev.oprev=x op)) lt | |
| 728 | 493 is-max : {a : Ordinal} {b : Ordinal} → odef (UnionCF A f mf ay (ZChain.supf zc) x) a → |
| 494 b o< x → (ab : odef A b) → | |
| 495 HasPrev A (UnionCF A f mf ay (ZChain.supf zc) x) ab f ∨ IsSup A (UnionCF A f mf ay (ZChain.supf zc) x) ab → | |
| 496 * a < * b → odef (UnionCF A f mf ay (ZChain.supf zc) x) b | |
| 735 | 497 is-max {a} {b} ua b<x ab (case1 has-prev) a<b = is-max-hp x {a} {b} ua b<x ab has-prev a<b |
| 733 | 498 is-max {a} {b} ua b<x ab (case2 is-sup) a<b with ODC.p∨¬p O ( HasPrev A (UnionCF A f mf ay (ZChain.supf zc) x) ab f ) |
| 735 | 499 ... | case1 has-prev = is-max-hp x {a} {b} ua b<x ab has-prev a<b |
| 734 | 500 ... | case2 ¬fy<x = m01 where |
| 735 | 501 px<x : px o< x |
| 502 px<x = subst (λ k → px o< k ) (Oprev.oprev=x op) <-osuc | |
| 728 | 503 m01 : odef (UnionCF A f mf ay (ZChain.supf zc) x) b |
| 736 | 504 m01 with trio< b px --- px < b < x |
| 505 ... | tri> ¬a ¬b c = ⊥-elim (¬p<x<op ⟪ c , subst (λ k → b o< k ) (sym (Oprev.oprev=x op)) b<x ⟫) | |
| 735 | 506 ... | tri< b<px ¬b ¬c = chain-mono2 x ( o<→≤ (subst (λ k → px o< k) (Oprev.oprev=x op) <-osuc )) o≤-refl m04 where |
| 761 | 507 m03 : odef (UnionCF A f mf ay (ZChain.supf zc) px) a -- if a ∈ chain of px, is-max of px can be used |
| 749 | 508 m03 with proj2 ua |
| 509 ... | ch-init fc = ⟪ proj1 ua , ch-init fc ⟫ | |
| 770 | 510 ... | ch-is-sup u is-sup-a fc = ⟪ proj1 ua , ch-is-sup u is-sup-a fc ⟫ |
| 728 | 511 m04 : odef (UnionCF A f mf ay (ZChain.supf zc) px) b |
| 735 | 512 m04 = ZChain1.is-max (prev px px<x) m03 b<px ab |
| 513 (case2 record {x<sup = λ {z} lt → IsSup.x<sup is-sup (chain-mono2 x ( o<→≤ (subst (λ k → px o< k) (Oprev.oprev=x op) <-osuc )) o≤-refl lt) } ) a<b | |
| 764 | 514 ... | tri≈ ¬a b=px ¬c = ⟪ ab , ch-is-sup b m06 (subst (λ k → FClosure A f k b) m05 (init ab)) ⟫ where |
| 763 | 515 b<A : b o< & A |
| 516 b<A = z09 ab | |
| 760 | 517 m05 : b ≡ ZChain.supf zc b |
| 761 | 518 m05 = sym ( ZChain.sup=u zc ab (z09 ab) |
| 760 | 519 record { x<sup = λ {z} uz → IsSup.x<sup is-sup (chain-mono2 x (osucc b<x) o≤-refl uz ) } ) |
| 765 | 520 m08 : {z : Ordinal} → (fcz : FClosure A f y z ) → z <= ZChain.supf zc b |
| 763 | 521 m08 {z} fcz = ZChain.fcy<sup zc b<A fcz |
| 769 | 522 m09 : {sup1 z1 : Ordinal} → (ZChain.supf zc sup1) o< (ZChain.supf zc b) |
| 523 → FClosure A f (ZChain.supf zc sup1) z1 → z1 <= ZChain.supf zc b | |
| 770 | 524 m09 {sup1} {z} s<b fcz = ZChain.order zc b<A s<b fcz |
| 762 | 525 m06 : ChainP A f mf ay (ZChain.supf zc) b b |
| 526 m06 = record { csupz = subst (λ k → FClosure A f k b) m05 (init ab) ; supfu=u = sym m05 | |
| 769 | 527 ; fcy<sup = m08 ; order = m09 } |
| 756 | 528 ... | no lim = record { is-max = is-max } where |
| 734 | 529 is-max : {a : Ordinal} {b : Ordinal} → odef (UnionCF A f mf ay (ZChain.supf zc) x) a → |
| 530 b o< x → (ab : odef A b) → | |
| 531 HasPrev A (UnionCF A f mf ay (ZChain.supf zc) x) ab f ∨ IsSup A (UnionCF A f mf ay (ZChain.supf zc) x) ab → | |
| 532 * a < * b → odef (UnionCF A f mf ay (ZChain.supf zc) x) b | |
| 735 | 533 is-max {a} {b} ua b<x ab (case1 has-prev) a<b = is-max-hp x {a} {b} ua b<x ab has-prev a<b |
| 743 | 534 is-max {a} {b} ua b<x ab (case2 is-sup) a<b with IsSup.x<sup is-sup (init-uchain A f mf ay ) |
| 535 ... | case1 b=y = ⊥-elim ( <-irr ( ZChain.initial zc (chain<ZA (chain-mono2 (osuc x) (o<→≤ <-osuc ) o≤-refl ua )) ) | |
| 536 (subst (λ k → * a < * k ) (sym b=y) a<b ) ) | |
| 744 | 537 ... | case2 y<b = chain-mono2 x (o<→≤ (ob<x lim b<x) ) o≤-refl m04 where |
| 759 | 538 m09 : b o< & A |
| 539 m09 = subst (λ k → k o< & A) &iso ( c<→o< (subst (λ k → odef A k ) (sym &iso ) ab)) | |
| 765 | 540 m07 : {z : Ordinal} → FClosure A f y z → z <= ZChain.supf zc b |
| 759 | 541 m07 {z} fc = ZChain.fcy<sup zc m09 fc |
| 769 | 542 m08 : {sup1 z1 : Ordinal} → (ZChain.supf zc sup1) o< (ZChain.supf zc b) |
| 543 → FClosure A f (ZChain.supf zc sup1) z1 → z1 <= ZChain.supf zc b | |
| 761 | 544 m08 {sup1} {z1} s<b fc = ZChain.order zc m09 s<b fc |
| 735 | 545 m05 : b ≡ ZChain.supf zc b |
| 761 | 546 m05 = sym (ZChain.sup=u zc ab m09 |
| 756 | 547 record { x<sup = λ lt → IsSup.x<sup is-sup (chain-mono2 x (o<→≤ (ob<x lim b<x)) o≤-refl lt )} ) -- ZChain on x |
| 739 | 548 m06 : ChainP A f mf ay (ZChain.supf zc) b b |
| 769 | 549 m06 = record { fcy<sup = m07 ; csupz = subst (λ k → FClosure A f k b ) m05 (init ab) ; order = m08 |
| 744 | 550 ; supfu=u = sym m05 } |
| 735 | 551 m04 : odef (UnionCF A f mf ay (ZChain.supf zc) (osuc b)) b |
| 764 | 552 m04 = ⟪ ab , ch-is-sup b m06 (subst (λ k → FClosure A f k b) m05 (init ab)) ⟫ |
| 727 | 553 |
| 543 | 554 --- |
| 560 | 555 --- the maximum chain has fix point of any ≤-monotonic function |
| 543 | 556 --- |
| 703 | 557 fixpoint : ( f : Ordinal → Ordinal ) → (mf : ≤-monotonic-f A f ) (zc : ZChain A f mf as0 (& A) ) |
|
633
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ZChain1 is not strictly positive
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents:
631
diff
changeset
|
558 → (total : IsTotalOrderSet (ZChain.chain zc) ) |
| 703 | 559 → f (& (SUP.sup (sp0 f mf zc total ))) ≡ & (SUP.sup (sp0 f mf zc total)) |
| 560 fixpoint f mf zc total = z14 where | |
| 538 | 561 chain = ZChain.chain zc |
| 703 | 562 sp1 = sp0 f mf zc total |
| 712 | 563 z10 : {a b : Ordinal } → (ca : odef chain a ) → b o< & A → (ab : odef A b ) |
| 570 | 564 → HasPrev A chain ab f ∨ IsSup A chain {b} ab -- (supO chain (ZChain.chain⊆A zc) (ZChain.f-total zc) ≡ b ) |
| 538 | 565 → * a < * b → odef chain b |
| 728 | 566 z10 = ZChain1.is-max (SZ1 A f mf as0 zc (& A) ) |
| 543 | 567 z11 : & (SUP.sup sp1) o< & A |
| 568 z11 = c<→o< ( SUP.A∋maximal sp1) | |
| 538 | 569 z12 : odef chain (& (SUP.sup sp1)) |
| 570 z12 with o≡? (& s) (& (SUP.sup sp1)) | |
| 653 | 571 ... | yes eq = subst (λ k → odef chain k) eq ( ZChain.chain∋init zc ) |
| 712 | 572 ... | no ne = z10 {& s} {& (SUP.sup sp1)} ( ZChain.chain∋init zc ) z11 (SUP.A∋maximal sp1) |
| 570 | 573 (case2 z19 ) z13 where |
| 538 | 574 z13 : * (& s) < * (& (SUP.sup sp1)) |
| 653 | 575 z13 with SUP.x<sup sp1 ( ZChain.chain∋init zc ) |
| 538 | 576 ... | case1 eq = ⊥-elim ( ne (cong (&) eq) ) |
| 577 ... | case2 lt = subst₂ (λ j k → j < k ) (sym *iso) (sym *iso) lt | |
| 570 | 578 z19 : IsSup A chain {& (SUP.sup sp1)} (SUP.A∋maximal sp1) |
| 571 | 579 z19 = record { x<sup = z20 } where |
| 580 z20 : {y : Ordinal} → odef chain y → (y ≡ & (SUP.sup sp1)) ∨ (y << & (SUP.sup sp1)) | |
| 581 z20 {y} zy with SUP.x<sup sp1 (subst (λ k → odef chain k ) (sym &iso) zy) | |
| 570 | 582 ... | case1 y=p = case1 (subst (λ k → k ≡ _ ) &iso ( cong (&) y=p )) |
| 583 ... | case2 y<p = case2 (subst (λ k → * y < k ) (sym *iso) y<p ) | |
| 584 -- λ {y} zy → subst (λ k → (y ≡ & k ) ∨ (y << & k)) ? (SUP.x<sup sp1 ? ) } | |
| 703 | 585 z14 : f (& (SUP.sup (sp0 f mf zc total ))) ≡ & (SUP.sup (sp0 f mf zc total )) |
|
633
6cd4a483122c
ZChain1 is not strictly positive
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents:
631
diff
changeset
|
586 z14 with total (subst (λ k → odef chain k) (sym &iso) (ZChain.f-next zc z12 )) z12 |
| 631 | 587 ... | tri< a ¬b ¬c = ⊥-elim z16 where |
| 588 z16 : ⊥ | |
| 589 z16 with proj1 (mf (& ( SUP.sup sp1)) ( SUP.A∋maximal sp1 )) | |
| 590 ... | case1 eq = ⊥-elim (¬b (subst₂ (λ j k → j ≡ k ) refl *iso (sym eq) )) | |
| 591 ... | case2 lt = ⊥-elim (¬c (subst₂ (λ j k → k < j ) refl *iso lt )) | |
| 592 ... | tri≈ ¬a b ¬c = subst ( λ k → k ≡ & (SUP.sup sp1) ) &iso ( cong (&) b ) | |
| 593 ... | tri> ¬a ¬b c = ⊥-elim z17 where | |
| 594 z15 : (* (f ( & ( SUP.sup sp1 ))) ≡ SUP.sup sp1) ∨ (* (f ( & ( SUP.sup sp1 ))) < SUP.sup sp1) | |
| 595 z15 = SUP.x<sup sp1 (subst (λ k → odef chain k ) (sym &iso) (ZChain.f-next zc z12 )) | |
| 596 z17 : ⊥ | |
| 597 z17 with z15 | |
| 598 ... | case1 eq = ¬b eq | |
| 599 ... | case2 lt = ¬a lt | |
| 560 | 600 |
| 601 -- ZChain contradicts ¬ Maximal | |
| 602 -- | |
| 571 | 603 -- ZChain forces fix point on any ≤-monotonic function (fixpoint) |
| 560 | 604 -- ¬ Maximal create cf which is a <-monotonic function by axiom of choice. This contradicts fix point of ZChain |
| 605 -- | |
| 697 | 606 z04 : (nmx : ¬ Maximal A ) |
| 703 | 607 → (zc : ZChain A (cf nmx) (cf-is-≤-monotonic nmx) as0 (& A)) |
| 664 | 608 → IsTotalOrderSet (ZChain.chain zc) → ⊥ |
| 703 | 609 z04 nmx zc total = <-irr0 {* (cf nmx c)} {* c} (subst (λ k → odef A k ) (sym &iso) (proj1 (is-cf nmx (SUP.A∋maximal sp1 )))) |
| 571 | 610 (subst (λ k → odef A (& k)) (sym *iso) (SUP.A∋maximal sp1) ) |
| 703 | 611 (case1 ( cong (*)( fixpoint (cf nmx) (cf-is-≤-monotonic nmx ) zc total ))) -- x ≡ f x ̄ |
|
633
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ZChain1 is not strictly positive
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents:
631
diff
changeset
|
612 (proj1 (cf-is-<-monotonic nmx c (SUP.A∋maximal sp1 ))) where -- x < f x |
|
6cd4a483122c
ZChain1 is not strictly positive
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents:
631
diff
changeset
|
613 sp1 : SUP A (ZChain.chain zc) |
| 703 | 614 sp1 = sp0 (cf nmx) (cf-is-≤-monotonic nmx) zc total |
| 538 | 615 c = & (SUP.sup sp1) |
| 548 | 616 |
| 757 | 617 uchain : ( f : Ordinal → Ordinal ) → (mf : ≤-monotonic-f A f ) {y : Ordinal} (ay : odef A y) → HOD |
| 618 uchain f mf {y} ay = record { od = record { def = λ x → FClosure A f y x } ; odmax = & A ; <odmax = | |
| 619 λ {z} cz → subst (λ k → k o< & A) &iso ( c<→o< (subst (λ k → odef A k ) (sym &iso ) (A∋fc y f mf cz ))) } | |
| 620 | |
| 621 utotal : ( f : Ordinal → Ordinal ) → (mf : ≤-monotonic-f A f ) {y : Ordinal} (ay : odef A y) | |
| 622 → IsTotalOrderSet (uchain f mf ay) | |
| 623 utotal f mf {y} ay {a} {b} ca cb = subst₂ (λ j k → Tri (j < k) (j ≡ k) (k < j)) *iso *iso uz01 where | |
| 624 uz01 : Tri (* (& a) < * (& b)) (* (& a) ≡ * (& b)) (* (& b) < * (& a) ) | |
| 625 uz01 = fcn-cmp y f mf ca cb | |
| 626 | |
| 627 ysup : ( f : Ordinal → Ordinal ) → (mf : ≤-monotonic-f A f ) {y : Ordinal} (ay : odef A y) | |
| 628 → SUP A (uchain f mf ay) | |
| 629 ysup f mf {y} ay = supP (uchain f mf ay) (λ lt → A∋fc y f mf lt) (utotal f mf ay) | |
| 630 | |
| 711 | 631 inititalChain : ( f : Ordinal → Ordinal ) → (mf : ≤-monotonic-f A f ) {y : Ordinal} (ay : odef A y) → ZChain A f mf ay o∅ |
| 767 | 632 inititalChain f mf {y} ay = record { supf = isupf ; chain⊆A = λ lt → proj1 lt ; chain∋init = cy |
| 771 | 633 ; csupf = λ {z} → csupf {z} ; fcy<sup = λ u<0 → ⊥-elim ( ¬x<0 u<0 ) ; supf-mono = λ _ → o≤-refl |
| 761 | 634 ; initial = isy ; f-next = inext ; f-total = itotal ; sup=u = λ _ b<0 → ⊥-elim (¬x<0 b<0) ; order = λ b<0 → ⊥-elim (¬x<0 b<0) } where |
| 764 | 635 spi = & (SUP.sup (ysup f mf ay)) |
| 711 | 636 isupf : Ordinal → Ordinal |
| 768 | 637 isupf z = spi |
| 763 | 638 sp = ysup f mf ay |
| 767 | 639 asi = SUP.A∋maximal sp |
| 711 | 640 cy : odef (UnionCF A f mf ay isupf o∅) y |
| 750 | 641 cy = ⟪ ay , ch-init (init ay) ⟫ |
| 759 | 642 y<sup : * y ≤ SUP.sup (ysup f mf ay) |
| 643 y<sup = SUP.x<sup (ysup f mf ay) (subst (λ k → FClosure A f y k ) (sym &iso) (init ay)) | |
| 711 | 644 isy : {z : Ordinal } → odef (UnionCF A f mf ay isupf o∅) z → * y ≤ * z |
| 748 | 645 isy {z} ⟪ az , uz ⟫ with uz |
| 646 ... | ch-init fc = s≤fc y f mf fc | |
| 768 | 647 ... | ch-is-sup u is-sup fc = ≤-ftrans (subst (λ k → * y ≤ k) (sym *iso) y<sup) (s≤fc (& (SUP.sup (ysup f mf ay))) f mf fc ) |
| 711 | 648 inext : {a : Ordinal} → odef (UnionCF A f mf ay isupf o∅) a → odef (UnionCF A f mf ay isupf o∅) (f a) |
| 748 | 649 inext {a} ua with (proj2 ua) |
| 650 ... | ch-init fc = ⟪ proj2 (mf _ (proj1 ua)) , ch-init (fsuc _ fc ) ⟫ | |
| 764 | 651 ... | ch-is-sup u is-sup fc = ⟪ proj2 (mf _ (proj1 ua)) , ch-is-sup u (ChainP-next A f mf ay isupf is-sup) (fsuc _ fc) ⟫ |
| 711 | 652 itotal : IsTotalOrderSet (UnionCF A f mf ay isupf o∅) |
| 653 itotal {a} {b} ca cb = subst₂ (λ j k → Tri (j < k) (j ≡ k) (k < j)) *iso *iso uz01 where | |
| 654 uz01 : Tri (* (& a) < * (& b)) (* (& a) ≡ * (& b)) (* (& b) < * (& a) ) | |
| 763 | 655 uz01 = chain-total A f mf ay isupf (proj2 ca) (proj2 cb) |
| 656 | |
| 657 csupf : {z : Ordinal} → odef (UnionCF A f mf ay isupf o∅) (isupf z) | |
| 768 | 658 csupf {z} = ⟪ asi , ch-is-sup spi uz02 (init asi) ⟫ where |
| 659 uz03 : {z : Ordinal } → FClosure A f y z → (z ≡ isupf spi) ∨ (z << isupf spi) | |
| 767 | 660 uz03 {z} fc with SUP.x<sup sp (subst (λ k → FClosure A f y k ) (sym &iso) fc ) |
| 661 ... | case1 eq = case1 ( begin | |
| 662 z ≡⟨ sym &iso ⟩ | |
| 663 & (* z) ≡⟨ cong (&) eq ⟩ | |
| 664 spi ∎ ) where open ≡-Reasoning | |
| 665 ... | case2 lt = case2 (subst (λ k → * z < k ) (sym *iso) lt ) | |
| 769 | 666 uz04 : {sup1 z1 : Ordinal} → isupf sup1 o< isupf spi → FClosure A f (isupf sup1) z1 → (z1 ≡ isupf spi) ∨ (z1 << isupf spi) |
| 667 uz04 {s} {z} s<spi fcz = ⊥-elim ( o<¬≡ refl s<spi ) | |
| 768 | 668 uz02 : ChainP A f mf ay isupf spi (isupf z) |
| 769 | 669 uz02 = record { csupz = init asi ; supfu=u = refl ; fcy<sup = uz03 ; order = λ {s} {z} → uz04 {s} {z} } |
| 767 | 670 |
| 711 | 671 |
| 560 | 672 -- |
| 547 | 673 -- create all ZChains under o< x |
| 560 | 674 -- |
|
608
6655f03984f9
mutual tranfinite in zorn
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents:
607
diff
changeset
|
675 |
| 674 | 676 ind : ( f : Ordinal → Ordinal ) → (mf : ≤-monotonic-f A f ) {y : Ordinal} (ay : odef A y) → (x : Ordinal) |
| 703 | 677 → ((z : Ordinal) → z o< x → ZChain A f mf ay z) → ZChain A f mf ay x |
| 707 | 678 ind f mf {y} ay x prev with Oprev-p x |
| 697 | 679 ... | yes op = zc4 where |
| 682 | 680 -- |
| 681 -- we have previous ordinal to use induction | |
| 682 -- | |
| 683 px = Oprev.oprev op | |
| 703 | 684 zc : ZChain A f mf ay (Oprev.oprev op) |
| 682 | 685 zc = prev px (subst (λ k → px o< k) (Oprev.oprev=x op) <-osuc ) |
| 686 px<x : px o< x | |
| 687 px<x = subst (λ k → px o< k) (Oprev.oprev=x op) <-osuc | |
| 709 | 688 zc-b<x : (b : Ordinal ) → b o< x → b o< osuc px |
| 689 zc-b<x b lt = subst (λ k → b o< k ) (sym (Oprev.oprev=x op)) lt | |
| 697 | 690 |
| 703 | 691 pchain : HOD |
| 692 pchain = UnionCF A f mf ay (ZChain.supf zc) x | |
| 693 ptotal : IsTotalOrderSet pchain | |
| 694 ptotal {a} {b} ca cb = subst₂ (λ j k → Tri (j < k) (j ≡ k) (k < j)) *iso *iso uz01 where | |
| 695 uz01 : Tri (* (& a) < * (& b)) (* (& a) ≡ * (& b)) (* (& b) < * (& a) ) | |
| 748 | 696 uz01 = chain-total A f mf ay (ZChain.supf zc) ( (proj2 ca)) ( (proj2 cb)) |
| 704 | 697 pchain⊆A : {y : Ordinal} → odef pchain y → odef A y |
| 698 pchain⊆A {y} ny = proj1 ny | |
| 699 pnext : {a : Ordinal} → odef pchain a → odef pchain (f a) | |
| 749 | 700 pnext {a} ⟪ aa , ch-init fc ⟫ = ⟪ proj2 (mf a aa) , ch-init (fsuc _ fc) ⟫ |
| 764 | 701 pnext {a} ⟪ aa , ch-is-sup u is-sup fc ⟫ = ⟪ proj2 (mf a aa) , ch-is-sup u (ChainP-next A f mf ay _ is-sup ) (fsuc _ fc ) ⟫ |
| 704 | 702 pinit : {y₁ : Ordinal} → odef pchain y₁ → * y ≤ * y₁ |
| 748 | 703 pinit {a} ⟪ aa , ua ⟫ with ua |
| 704 ... | ch-init fc = s≤fc y f mf fc | |
| 770 | 705 ... | ch-is-sup u is-sup fc = ≤-ftrans (<=to≤ zc7) (s≤fc _ f mf fc) where |
| 765 | 706 zc7 : y <= (ZChain.supf zc) u |
| 707 | 707 zc7 = ChainP.fcy<sup is-sup (init ay) |
| 704 | 708 pcy : odef pchain y |
| 748 | 709 pcy = ⟪ ay , ch-init (init ay) ⟫ |
| 703 | 710 |
| 754 | 711 supf0 = ZChain.supf zc |
| 712 | |
| 713 csupf : {z : Ordinal} → odef (UnionCF A f mf ay supf0 x) (supf0 z) | |
| 714 csupf {z} with ZChain.csupf zc {z} | |
| 715 ... | ⟪ az , ch-init fc ⟫ = ⟪ az , ch-init fc ⟫ | |
| 764 | 716 ... | ⟪ az , ch-is-sup u is-sup fc ⟫ = ⟪ az , ch-is-sup u is-sup fc ⟫ |
| 745 | 717 |
| 611 | 718 -- if previous chain satisfies maximality, we caan reuse it |
| 719 -- | |
| 727 | 720 no-extension : ZChain A f mf ay x |
| 745 | 721 no-extension = record { supf = supf0 |
| 770 | 722 ; initial = pinit ; chain∋init = pcy ; csupf = csupf ; sup=u = ? ; order = ? ; fcy<sup = ? ; supf-mono = ZChain.supf-mono zc |
| 754 | 723 ; chain⊆A = pchain⊆A ; f-next = pnext ; f-total = ptotal } |
| 709 | 724 |
| 703 | 725 zc4 : ZChain A f mf ay x |
| 713 | 726 zc4 with ODC.∋-p O A (* px) |
| 727 | 727 ... | no noapx = no-extension -- ¬ A ∋ p, just skip |
| 713 | 728 ... | yes apx with ODC.p∨¬p O ( HasPrev A (ZChain.chain zc ) apx f ) |
| 703 | 729 -- we have to check adding x preserve is-max ZChain A y f mf x |
| 727 | 730 ... | case1 pr = no-extension -- we have previous A ∋ z < x , f z ≡ x, so chain ∋ f z ≡ x because of f-next |
| 713 | 731 ... | case2 ¬fy<x with ODC.p∨¬p O (IsSup A (ZChain.chain zc ) apx ) |
| 682 | 732 ... | case1 is-sup = -- x is a sup of zc |
| 770 | 733 record { supf = psupf1 ; chain⊆A = ? ; f-next = ? ; f-total = ? ; csupf = ? ; sup=u = ? ; order = ? ; fcy<sup = ? |
| 734 ; supf-mono = ? ; initial = ? ; chain∋init = ? } where | |
| 750 | 735 psupf1 : Ordinal → Ordinal |
| 736 psupf1 z with trio< z x | |
| 737 ... | tri< a ¬b ¬c = ZChain.supf zc z | |
| 738 ... | tri≈ ¬a b ¬c = x | |
| 739 ... | tri> ¬a ¬b c = x | |
| 727 | 740 ... | case2 ¬x=sup = no-extension -- px is not f y' nor sup of former ZChain from y -- no extention |
|
758
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|
741 |
| 728 | 742 ... | no lim = zc5 where |
|
726
b2e2cd12e38f
psupf-mono and is-max conflict
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parents:
725
diff
changeset
|
743 |
| 703 | 744 pzc : (z : Ordinal) → z o< x → ZChain A f mf ay z |
| 745 pzc z z<x = prev z z<x | |
|
726
b2e2cd12e38f
psupf-mono and is-max conflict
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parents:
725
diff
changeset
|
746 |
| 703 | 747 psupf0 : (z : Ordinal) → Ordinal |
| 748 psupf0 z with trio< z x | |
| 755 | 749 ... | tri< a ¬b ¬c = ZChain.supf (pzc (osuc z) (ob<x lim a)) z |
| 750 ... | tri≈ ¬a b ¬c = & A -- Sup of FClosure A f y z ? | |
| 751 ... | tri> ¬a ¬b c = & A -- | |
| 752 | |
| 753 pchain0 : HOD | |
| 754 pchain0 = UnionCF A f mf ay psupf0 x | |
| 755 | |
| 756 ptotal0 : IsTotalOrderSet pchain0 | |
| 757 ptotal0 {a} {b} ca cb = subst₂ (λ j k → Tri (j < k) (j ≡ k) (k < j)) *iso *iso uz01 where | |
| 758 uz01 : Tri (* (& a) < * (& b)) (* (& a) ≡ * (& b)) (* (& b) < * (& a) ) | |
| 759 uz01 = chain-total A f mf ay psupf0 ( (proj2 ca)) ( (proj2 cb)) | |
| 760 | |
| 761 | |
| 762 usup : SUP A pchain0 | |
| 763 usup = supP pchain0 (λ lt → proj1 lt) ptotal0 | |
| 764 spu = & (SUP.sup usup) | |
| 765 | |
| 766 psupf : Ordinal → Ordinal | |
| 767 psupf z with trio< z x | |
| 768 ... | tri< a ¬b ¬c = ZChain.supf (pzc (osuc z) (ob<x lim a)) z | |
| 769 ... | tri≈ ¬a b ¬c = spu | |
| 770 ... | tri> ¬a ¬b c = spu | |
| 771 | |
| 772 psupf>z : {z : Ordinal } → x o< z → spu ≡ psupf z | |
| 773 psupf>z {z} x<z with trio< z x | |
| 774 ... | tri< a ¬b ¬c = ⊥-elim ( ¬c x<z) | |
| 775 ... | tri≈ ¬a b ¬c = ⊥-elim ( ¬c x<z) | |
| 776 ... | tri> ¬a ¬b c = refl | |
| 777 | |
| 778 psupf=x : spu ≡ psupf x | |
| 779 psupf=x = zc20 refl where | |
| 780 zc20 : {z : Ordinal } → z ≡ x → spu ≡ psupf x | |
| 781 zc20 {z} z=x with trio< z x | inspect psupf z | |
| 782 ... | tri< a ¬b ¬c | _ = ⊥-elim ( ¬b z=x) | |
| 783 ... | tri≈ ¬a b ¬c | record { eq = eq1 } = subst (λ k → spu ≡ psupf k) b (sym eq1) | |
| 784 ... | tri> ¬a ¬b c | _ = ⊥-elim ( ¬b z=x) | |
| 785 | |
| 786 csupf :{z : Ordinal} → odef (UnionCF A f mf ay psupf x) (psupf z) | |
| 787 csupf {z} with trio< z x | inspect psupf z | |
| 788 ... | tri< z<x ¬b ¬c | record { eq = eq1 } = zc11 where | |
| 789 ozc = pzc (osuc z) (ob<x lim z<x) | |
| 790 zc12 : odef A (ZChain.supf ozc z) | |
| 791 ∧ UChain A f mf ay (ZChain.supf ozc) (osuc z) (ZChain.supf ozc z) | |
| 792 zc12 = ZChain.csupf ozc {z} | |
| 793 zc11 : odef A (ZChain.supf ozc z) ∧ UChain A f mf ay psupf x (ZChain.supf ozc z) | |
| 794 zc11 with zc12 | |
| 795 ... | ⟪ az , ch-init fc ⟫ = ⟪ az , ch-init fc ⟫ | |
| 771 | 796 ... | ⟪ az , ch-is-sup u is-sup fc ⟫ = ⟪ az , z13 fc is-sup ⟫ where |
| 797 z13 : FClosure A f (ZChain.supf ozc u ) (ZChain.supf ozc z ) → ChainP A f mf ay (ZChain.supf ozc) u (ZChain.supf ozc z ) | |
| 798 → UChain A f mf ay psupf x (ZChain.supf ozc z ) | |
| 799 z13 fc is-sup = ? | |
| 800 | |
| 801 -- ch-is-sup z | |
| 802 -- zc14 (subst (λ k → FClosure A f k (ZChain.supf ozc z)) (sym eq1) (init az)) ⟫ where | |
| 803 -- zc14 : ChainP A f mf ay psupf z (ZChain.supf ozc z) | |
| 804 -- zc14 = record { csupz = ? ; supfu=u = ? ; fcy<sup = ? ; order = ? } where | |
| 805 -- csupz : FClosure A f (psupf z) (ZChain.supf ozc z) | |
| 806 -- csupz = ? | |
| 807 | |
| 764 | 808 ... | tri≈ ¬a b ¬c | record { eq = eq1 } = ⟪ SUP.A∋maximal usup , ch-is-sup x zc15 |
| 755 | 809 (subst (λ k → FClosure A f k spu) zc17 (init (SUP.A∋maximal usup))) ⟫ where |
| 810 zc15 : ChainP A f mf ay psupf x spu | |
| 811 zc15 = ? | |
| 812 zc17 : spu ≡ psupf x | |
| 813 zc17 = subst (λ k → spu ≡ psupf k ) b (sym eq1) | |
| 764 | 814 ... | tri> ¬a ¬b c | record { eq = eq1 } = ⟪ SUP.A∋maximal usup , ch-is-sup x zc16 |
| 755 | 815 (subst (λ k → FClosure A f k spu) psupf=x (init (SUP.A∋maximal usup))) ⟫ where |
| 816 zc16 : ChainP A f mf ay psupf x spu | |
| 817 zc16 = ? | |
|
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parents:
725
diff
changeset
|
818 |
| 704 | 819 pchain : HOD |
| 755 | 820 pchain = UnionCF A f mf ay psupf x |
| 704 | 821 |
| 822 pchain⊆A : {y : Ordinal} → odef pchain y → odef A y | |
| 823 pchain⊆A {y} ny = proj1 ny | |
| 824 pnext : {a : Ordinal} → odef pchain a → odef pchain (f a) | |
| 750 | 825 pnext {a} ⟪ aa , ch-init fc ⟫ = ⟪ proj2 ( mf a aa ) , ch-init (fsuc _ fc) ⟫ |
| 764 | 826 pnext {a} ⟪ aa , ch-is-sup u is-sup fc ⟫ = ⟪ proj2 ( mf a aa ) , ch-is-sup u (ChainP-next A f mf ay _ is-sup ) (fsuc _ fc) ⟫ |
| 704 | 827 pinit : {y₁ : Ordinal} → odef pchain y₁ → * y ≤ * y₁ |
| 748 | 828 pinit {a} ⟪ aa , ua ⟫ with ua |
| 829 ... | ch-init fc = s≤fc y f mf fc | |
| 770 | 830 ... | ch-is-sup u is-sup fc = ≤-ftrans (<=to≤ zc7) (s≤fc _ f mf fc) where |
| 765 | 831 zc7 : y <= psupf _ |
| 707 | 832 zc7 = ChainP.fcy<sup is-sup (init ay) |
| 704 | 833 pcy : odef pchain y |
| 748 | 834 pcy = ⟪ ay , ch-init (init ay) ⟫ |
| 755 | 835 ptotal : IsTotalOrderSet pchain |
| 836 ptotal {a} {b} ca cb = subst₂ (λ j k → Tri (j < k) (j ≡ k) (k < j)) *iso *iso uz01 where | |
| 837 uz01 : Tri (* (& a) < * (& b)) (* (& a) ≡ * (& b)) (* (& b) < * (& a) ) | |
| 838 uz01 = chain-total A f mf ay psupf ( (proj2 ca)) ( (proj2 cb)) | |
| 754 | 839 |
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parents:
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840 is-max-hp : (supf : Ordinal → Ordinal) (x : Ordinal) {a : Ordinal} {b : Ordinal} → odef (UnionCF A f mf ay supf x) a → |
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841 b o< x → (ab : odef A b) → |
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842 HasPrev A (UnionCF A f mf ay supf x) ab f → |
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843 * a < * b → odef (UnionCF A f mf ay supf x) b |
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844 is-max-hp supf x {a} {b} ua b<x ab has-prev a<b with HasPrev.ay has-prev |
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845 ... | ⟪ ab0 , ch-init fc ⟫ = ⟪ ab , ch-init ( subst (λ k → FClosure A f y k) (sym (HasPrev.x=fy has-prev)) (fsuc _ fc )) ⟫ |
| 764 | 846 ... | ⟪ ab0 , ch-is-sup u is-sup fc ⟫ = ⟪ ab , |
|
758
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parents:
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diff
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|
847 subst (λ k → UChain A f mf ay supf x k ) |
| 764 | 848 (sym (HasPrev.x=fy has-prev)) ( ch-is-sup u (ChainP-next A f mf ay _ is-sup) (fsuc _ fc)) ⟫ |
|
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parents:
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|
849 |
| 754 | 850 no-extension : ZChain A f mf ay x |
| 756 | 851 no-extension = record { initial = pinit ; chain∋init = pcy ; supf = psupf ; csupf = csupf ; sup=u = ? ; order = ? ; fcy<sup = ? |
| 770 | 852 ; supf-mono = ? ; chain⊆A = pchain⊆A ; f-next = pnext ; f-total = ptotal } |
| 703 | 853 zc5 : ZChain A f mf ay x |
| 697 | 854 zc5 with ODC.∋-p O A (* x) |
|
732
ddeb107b6f71
bchain can be reached from upwords by f. so it is worng.
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents:
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diff
changeset
|
855 ... | no noax = no-extension -- ¬ A ∋ p, just skip |
| 704 | 856 ... | yes ax with ODC.p∨¬p O ( HasPrev A pchain ax f ) |
| 703 | 857 -- we have to check adding x preserve is-max ZChain A y f mf x |
| 727 | 858 ... | case1 pr = no-extension |
| 704 | 859 ... | case2 ¬fy<x with ODC.p∨¬p O (IsSup A pchain ax ) |
| 756 | 860 ... | case1 is-sup = record { initial = {!!} ; chain∋init = {!!} ; supf = psupf1 ; csupf = ? ; sup=u = ? ; order = ? ; fcy<sup = ? |
| 770 | 861 ; supf-mono = ? ; chain⊆A = {!!} ; f-next = {!!} ; f-total = ? } where -- x is a sup of (zc ?) |
| 728 | 862 psupf1 : Ordinal → Ordinal |
| 863 psupf1 z with trio< z x | |
| 864 ... | tri< a ¬b ¬c = ZChain.supf (pzc z a) z | |
| 865 ... | tri≈ ¬a b ¬c = x | |
| 866 ... | tri> ¬a ¬b c = x | |
| 727 | 867 ... | case2 ¬x=sup = no-extension -- x is not f y' nor sup of former ZChain from y -- no extention |
| 553 | 868 |
| 703 | 869 SZ : ( f : Ordinal → Ordinal ) → (mf : ≤-monotonic-f A f ) → {y : Ordinal} (ay : odef A y) → ZChain A f mf ay (& A) |
| 870 SZ f mf {y} ay = TransFinite {λ z → ZChain A f mf ay z } (λ x → ind f mf ay x ) (& A) | |
|
608
6655f03984f9
mutual tranfinite in zorn
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parents:
607
diff
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|
871 |
| 551 | 872 zorn00 : Maximal A |
| 873 zorn00 with is-o∅ ( & HasMaximal ) -- we have no Level (suc n) LEM | |
| 874 ... | no not = record { maximal = ODC.minimal O HasMaximal (λ eq → not (=od∅→≡o∅ eq)) ; A∋maximal = zorn01 ; ¬maximal<x = zorn02 } where | |
| 875 -- yes we have the maximal | |
| 876 zorn03 : odef HasMaximal ( & ( ODC.minimal O HasMaximal (λ eq → not (=od∅→≡o∅ eq)) ) ) | |
| 606 | 877 zorn03 = ODC.x∋minimal O HasMaximal (λ eq → not (=od∅→≡o∅ eq)) -- Axiom of choice |
| 551 | 878 zorn01 : A ∋ ODC.minimal O HasMaximal (λ eq → not (=od∅→≡o∅ eq)) |
| 879 zorn01 = proj1 zorn03 | |
| 880 zorn02 : {x : HOD} → A ∋ x → ¬ (ODC.minimal O HasMaximal (λ eq → not (=od∅→≡o∅ eq)) < x) | |
| 881 zorn02 {x} ax m<x = proj2 zorn03 (& x) ax (subst₂ (λ j k → j < k) (sym *iso) (sym *iso) m<x ) | |
| 703 | 882 ... | yes ¬Maximal = ⊥-elim ( z04 nmx zorn04 total ) where |
| 551 | 883 -- if we have no maximal, make ZChain, which contradict SUP condition |
| 884 nmx : ¬ Maximal A | |
| 885 nmx mx = ∅< {HasMaximal} zc5 ( ≡o∅→=od∅ ¬Maximal ) where | |
| 886 zc5 : odef A (& (Maximal.maximal mx)) ∧ (( y : Ordinal ) → odef A y → ¬ (* (& (Maximal.maximal mx)) < * y)) | |
| 887 zc5 = ⟪ Maximal.A∋maximal mx , (λ y ay mx<y → Maximal.¬maximal<x mx (subst (λ k → odef A k ) (sym &iso) ay) (subst (λ k → k < * y) *iso mx<y) ) ⟫ | |
| 703 | 888 zorn04 : ZChain A (cf nmx) (cf-is-≤-monotonic nmx) as0 (& A) |
| 653 | 889 zorn04 = SZ (cf nmx) (cf-is-≤-monotonic nmx) (subst (λ k → odef A k ) &iso as ) |
| 634 | 890 total : IsTotalOrderSet (ZChain.chain zorn04) |
| 654 | 891 total {a} {b} = zorn06 where |
| 892 zorn06 : odef (ZChain.chain zorn04) (& a) → odef (ZChain.chain zorn04) (& b) → Tri (a < b) (a ≡ b) (b < a) | |
| 893 zorn06 = ZChain.f-total (SZ (cf nmx) (cf-is-≤-monotonic nmx) (subst (λ k → odef A k ) &iso as) ) | |
| 551 | 894 |
| 516 | 895 -- usage (see filter.agda ) |
| 896 -- | |
| 497 | 897 -- _⊆'_ : ( A B : HOD ) → Set n |
| 898 -- _⊆'_ A B = (x : Ordinal ) → odef A x → odef B x | |
| 482 | 899 |
| 497 | 900 -- MaximumSubset : {L P : HOD} |
| 901 -- → o∅ o< & L → o∅ o< & P → P ⊆ L | |
| 902 -- → IsPartialOrderSet P _⊆'_ | |
| 903 -- → ( (B : HOD) → B ⊆ P → IsTotalOrderSet B _⊆'_ → SUP P B _⊆'_ ) | |
| 904 -- → Maximal P (_⊆'_) | |
| 905 -- MaximumSubset {L} {P} 0<L 0<P P⊆L PO SP = Zorn-lemma {P} {_⊆'_} 0<P PO SP |