Mercurial > hg > Members > kono > Proof > ZF-in-agda
annotate src/zorn.agda @ 764:bbf12d61143f
< is wrong
author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Mon, 25 Jul 2022 17:53:18 +0900 |
parents | 9aa0fc917100 |
children | 7fff07748fde |
rev | line source |
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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 | |
58 POO : IsStrictPartialOrder _≡_ _<<_ | |
59 POO = record { isEquivalence = record { refl = refl ; sym = sym ; trans = trans } | |
60 ; trans = IsStrictPartialOrder.trans PO | |
61 ; irrefl = λ x=y x<y → IsStrictPartialOrder.irrefl PO (cong (*) x=y) x<y | |
62 ; <-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 } } | |
63 | |
528
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64 _≤_ : (x y : HOD) → Set (Level.suc n) |
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65 x ≤ y = ( x ≡ y ) ∨ ( x < y ) |
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TransitiveClosure with x <= f x is possible
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66 |
554 | 67 ≤-ftrans : {x y z : HOD} → x ≤ y → y ≤ z → x ≤ z |
68 ≤-ftrans {x} {y} {z} (case1 refl ) (case1 refl ) = case1 refl | |
69 ≤-ftrans {x} {y} {z} (case1 refl ) (case2 y<z) = case2 y<z | |
70 ≤-ftrans {x} {_} {z} (case2 x<y ) (case1 refl ) = case2 x<y | |
71 ≤-ftrans {x} {y} {z} (case2 x<y) (case2 y<z) = case2 ( IsStrictPartialOrder.trans PO x<y y<z ) | |
72 | |
556 | 73 <-irr : {a b : HOD} → (a ≡ b ) ∨ (a < b ) → b < a → ⊥ |
74 <-irr {a} {b} (case1 a=b) b<a = IsStrictPartialOrder.irrefl PO (sym a=b) b<a | |
75 <-irr {a} {b} (case2 a<b) b<a = IsStrictPartialOrder.irrefl PO refl | |
76 (IsStrictPartialOrder.trans PO b<a a<b) | |
490 | 77 |
561 | 78 ptrans = IsStrictPartialOrder.trans PO |
79 | |
492 | 80 open _==_ |
81 open _⊆_ | |
82 | |
530 | 83 -- |
560 | 84 -- Closure of ≤-monotonic function f has total order |
530 | 85 -- |
86 | |
87 ≤-monotonic-f : (A : HOD) → ( Ordinal → Ordinal ) → Set (Level.suc n) | |
88 ≤-monotonic-f A f = (x : Ordinal ) → odef A x → ( * x ≤ * (f x) ) ∧ odef A (f x ) | |
89 | |
551 | 90 data FClosure (A : HOD) (f : Ordinal → Ordinal ) (s : Ordinal) : Ordinal → Set n where |
600 | 91 init : odef A s → FClosure A f s s |
555 | 92 fsuc : (x : Ordinal) ( p : FClosure A f s x ) → FClosure A f s (f x) |
554 | 93 |
556 | 94 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 | 95 A∋fc {A} s f mf (init as) = as |
556 | 96 A∋fc {A} s f mf (fsuc y fcy) = proj2 (mf y ( A∋fc {A} s f mf fcy ) ) |
555 | 97 |
714 | 98 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 |
99 A∋fcs {A} s f mf (init as) = as | |
100 A∋fcs {A} s f mf (fsuc y fcy) = A∋fcs {A} s f mf fcy | |
101 | |
556 | 102 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 | 103 s≤fc {A} s {.s} f mf (init x) = case1 refl |
556 | 104 s≤fc {A} s {.(f x)} f mf (fsuc x fcy) with proj1 (mf x (A∋fc s f mf fcy ) ) |
105 ... | case1 x=fx = subst (λ k → * s ≤ * k ) (*≡*→≡ x=fx) ( s≤fc {A} s f mf fcy ) | |
106 ... | case2 x<fx with s≤fc {A} s f mf fcy | |
107 ... | case1 s≡x = case2 ( subst₂ (λ j k → j < k ) (sym s≡x) refl x<fx ) | |
108 ... | case2 s<x = case2 ( IsStrictPartialOrder.trans PO s<x x<fx ) | |
555 | 109 |
557 | 110 fcn : {A : HOD} (s : Ordinal) { x : Ordinal} {f : Ordinal → Ordinal} → (mf : ≤-monotonic-f A f) → FClosure A f s x → ℕ |
600 | 111 fcn s mf (init as) = zero |
558 | 112 fcn {A} s {x} {f} mf (fsuc y p) with proj1 (mf y (A∋fc s f mf p)) |
113 ... | case1 eq = fcn s mf p | |
114 ... | case2 y<fy = suc (fcn s mf p ) | |
557 | 115 |
558 | 116 fcn-inject : {A : HOD} (s : Ordinal) { x y : Ordinal} {f : Ordinal → Ordinal} → (mf : ≤-monotonic-f A f) |
117 → (cx : FClosure A f s x ) (cy : FClosure A f s y ) → fcn s mf cx ≡ fcn s mf cy → * x ≡ * y | |
559 | 118 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 |
119 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 | 120 fc00 zero zero refl (init _) (init x₁) i=x i=y = refl |
121 fc00 zero zero refl (init as) (fsuc y cy) i=x i=y with proj1 (mf y (A∋fc s f mf cy ) ) | |
122 ... | case1 y=fy = subst (λ k → * s ≡ k ) y=fy ( fc00 zero zero refl (init as) cy i=x i=y ) | |
123 fc00 zero zero refl (fsuc x cx) (init as) i=x i=y with proj1 (mf x (A∋fc s f mf cx ) ) | |
124 ... | case1 x=fx = subst (λ k → k ≡ * s ) x=fx ( fc00 zero zero refl cx (init as) i=x i=y ) | |
559 | 125 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 ) ) |
126 ... | 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 ) | |
127 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 ) ) | |
128 ... | 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 ) | |
129 ... | case1 x=fx | case2 y<fy = subst (λ k → k ≡ * (f y)) x=fx (fc02 x cx i=x) where | |
130 fc02 : (x1 : Ordinal) → (cx1 : FClosure A f s x1 ) → suc i ≡ fcn s mf cx1 → * x1 ≡ * (f y) | |
131 fc02 .(f x1) (fsuc x1 cx1) i=x1 with proj1 (mf x1 (A∋fc s f mf cx1 ) ) | |
560 | 132 ... | case1 eq = trans (sym eq) ( fc02 x1 cx1 i=x1 ) -- derefence while f x ≡ x |
559 | 133 ... | case2 lt = subst₂ (λ j k → * (f j) ≡ * (f k )) &iso &iso ( cong (λ k → * ( f (& k ))) fc04) where |
134 fc04 : * x1 ≡ * y | |
135 fc04 = fc00 i j (cong pred i=j) cx1 cy (cong pred i=x1) (cong pred j=y) | |
136 ... | case2 x<fx | case1 y=fy = subst (λ k → * (f x) ≡ k ) y=fy (fc03 y cy j=y) where | |
137 fc03 : (y1 : Ordinal) → (cy1 : FClosure A f s y1 ) → suc j ≡ fcn s mf cy1 → * (f x) ≡ * y1 | |
138 fc03 .(f y1) (fsuc y1 cy1) j=y1 with proj1 (mf y1 (A∋fc s f mf cy1 ) ) | |
139 ... | case1 eq = trans ( fc03 y1 cy1 j=y1 ) eq | |
140 ... | case2 lt = subst₂ (λ j k → * (f j) ≡ * (f k )) &iso &iso ( cong (λ k → * ( f (& k ))) fc05) where | |
141 fc05 : * x ≡ * y1 | |
142 fc05 = fc00 i j (cong pred i=j) cx cy1 (cong pred i=x) (cong pred j=y1) | |
143 ... | 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 | 144 |
600 | 145 |
557 | 146 fcn-< : {A : HOD} (s : Ordinal ) { x y : Ordinal} {f : Ordinal → Ordinal} → (mf : ≤-monotonic-f A f) |
147 → (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 | 148 fcn-< {A} s {x} {y} {f} mf cx cy x<y = fc01 (fcn s mf cy) cx cy refl x<y where |
149 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 | |
150 fc01 (suc i) {y} cx (fsuc y1 cy) i=y (s≤s x<i) with proj1 (mf y1 (A∋fc s f mf cy ) ) | |
151 ... | case1 y=fy = subst (λ k → * x < k ) y=fy ( fc01 (suc i) {y1} cx cy i=y (s≤s x<i) ) | |
152 ... | case2 y<fy with <-cmp (fcn s mf cx ) i | |
153 ... | tri> ¬a ¬b c = ⊥-elim ( nat-≤> x<i c ) | |
154 ... | 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 | |
155 ... | tri< a ¬b ¬c = IsStrictPartialOrder.trans PO fc02 y<fy where | |
156 fc03 : suc i ≡ suc (fcn s mf cy) → i ≡ fcn s mf cy | |
157 fc03 eq = cong pred eq | |
158 fc02 : * x < * y1 | |
159 fc02 = fc01 i cx cy (fc03 i=y ) a | |
557 | 160 |
559 | 161 fcn-cmp : {A : HOD} (s : Ordinal) { x y : Ordinal } (f : Ordinal → Ordinal) (mf : ≤-monotonic-f A f) |
554 | 162 → (cx : FClosure A f s x) → (cy : FClosure A f s y ) → Tri (* x < * y) (* x ≡ * y) (* y < * x ) |
559 | 163 fcn-cmp {A} s {x} {y} f mf cx cy with <-cmp ( fcn s mf cx ) (fcn s mf cy ) |
164 ... | tri< a ¬b ¬c = tri< fc11 (λ eq → <-irr (case1 (sym eq)) fc11) (λ lt → <-irr (case2 fc11) lt) where | |
165 fc11 : * x < * y | |
166 fc11 = fcn-< {A} s {x} {y} {f} mf cx cy a | |
167 ... | tri≈ ¬a b ¬c = tri≈ (λ lt → <-irr (case1 (sym fc10)) lt) fc10 (λ lt → <-irr (case1 fc10) lt) where | |
168 fc10 : * x ≡ * y | |
169 fc10 = fcn-inject {A} s {x} {y} {f} mf cx cy b | |
170 ... | tri> ¬a ¬b c = tri> (λ lt → <-irr (case2 fc12) lt) (λ eq → <-irr (case1 eq) fc12) fc12 where | |
171 fc12 : * y < * x | |
172 fc12 = fcn-< {A} s {y} {x} {f} mf cy cx c | |
173 | |
600 | 174 |
562 | 175 fcn-imm : {A : HOD} (s : Ordinal) { x y : Ordinal } (f : Ordinal → Ordinal) (mf : ≤-monotonic-f A f) |
176 → (cx : FClosure A f s x) → (cy : FClosure A f s y ) → ¬ ( ( * x < * y ) ∧ ( * y < * (f x )) ) | |
563 | 177 fcn-imm {A} s {x} {y} f mf cx cy ⟪ x<y , y<fx ⟫ = fc21 where |
178 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 ) | |
179 fc20 y<sx with <-cmp ( fcn s mf cy ) (fcn s mf cx ) | |
180 ... | tri< a ¬b ¬c = case2 a | |
181 ... | tri≈ ¬a b ¬c = case1 b | |
182 ... | tri> ¬a ¬b c = ⊥-elim ( nat-≤> y<sx (s≤s c)) | |
183 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 | |
184 fc17 {x} {y} cx cy sx=y = fc18 (fcn s mf cy) cx cy refl sx=y where | |
185 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 | |
186 fc18 (suc i) {y} cx (fsuc y1 cy) i=y sx=i with proj1 (mf y1 (A∋fc s f mf cy ) ) | |
187 ... | case1 y=fy = subst (λ k → * (f x) ≡ k ) y=fy ( fc18 (suc i) {y1} cx cy i=y sx=i) -- dereference | |
188 ... | case2 y<fy = subst₂ (λ j k → * (f j) ≡ * (f k) ) &iso &iso (cong (λ k → * (f (& k) ) ) fc19) where | |
189 fc19 : * x ≡ * y1 | |
190 fc19 = fcn-inject s mf cx cy (cong pred ( trans sx=i i=y )) | |
191 fc21 : ⊥ | |
192 fc21 with <-cmp (suc ( fcn s mf cx )) (fcn s mf cy ) | |
193 ... | tri< a ¬b ¬c = <-irr (case2 y<fx) (fc22 a) where -- suc ncx < ncy | |
194 cxx : FClosure A f s (f x) | |
195 cxx = fsuc x cx | |
196 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 | 197 fc16 x (init as) with proj1 (mf s as ) |
563 | 198 ... | case1 _ = case1 refl |
199 ... | case2 _ = case2 refl | |
200 fc16 .(f x) (fsuc x cx ) with proj1 (mf (f x) (A∋fc s f mf (fsuc x cx)) ) | |
201 ... | case1 _ = case1 refl | |
202 ... | case2 _ = case2 refl | |
203 fc22 : (suc ( fcn s mf cx )) Data.Nat.< (fcn s mf cy ) → * (f x) < * y | |
204 fc22 a with fc16 x cx | |
205 ... | case1 eq = fcn-< s mf cxx cy (subst (λ k → k Data.Nat.< fcn s mf cy ) eq (<-trans a<sa a)) | |
206 ... | case2 eq = fcn-< s mf cxx cy (subst (λ k → k Data.Nat.< fcn s mf cy ) eq a ) | |
207 ... | tri≈ ¬a b ¬c = <-irr (case1 (fc17 cx cy b)) y<fx | |
208 ... | tri> ¬a ¬b c with fc20 c -- ncy < suc ncx | |
209 ... | case1 y=x = <-irr (case1 ( fcn-inject s mf cy cx y=x )) x<y | |
210 ... | case2 y<x = <-irr (case2 x<y) (fcn-< s mf cy cx y<x ) | |
211 | |
729 | 212 fc-conv : (A : HOD ) (f : Ordinal → Ordinal) {b u : Ordinal } |
213 → {p0 p1 : Ordinal → Ordinal} | |
214 → p0 u ≡ p1 u | |
215 → FClosure A f (p0 u) b → FClosure A f (p1 u) b | |
216 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) | |
217 ( init (subst (λ k → odef A k) p0u=p1u ap0u )) | |
218 fc-conv A f {_} {u} {p0} {p1} p0u=p1u (fsuc z fc) = fsuc z (fc-conv A f {_} {u} {p0} {p1} p0u=p1u fc) | |
219 | |
560 | 220 -- open import Relation.Binary.Properties.Poset as Poset |
221 | |
222 IsTotalOrderSet : ( A : HOD ) → Set (Level.suc n) | |
223 IsTotalOrderSet A = {a b : HOD} → odef A (& a) → odef A (& b) → Tri (a < b) (a ≡ b) (b < a ) | |
224 | |
567 | 225 ⊆-IsTotalOrderSet : { A B : HOD } → B ⊆ A → IsTotalOrderSet A → IsTotalOrderSet B |
568 | 226 ⊆-IsTotalOrderSet {A} {B} B⊆A T ax ay = T (incl B⊆A ax) (incl B⊆A ay) |
567 | 227 |
568 | 228 _⊆'_ : ( A B : HOD ) → Set n |
229 _⊆'_ A B = {x : Ordinal } → odef A x → odef B x | |
560 | 230 |
231 -- | |
232 -- inductive maxmum tree from x | |
233 -- tree structure | |
234 -- | |
554 | 235 |
567 | 236 record HasPrev (A B : HOD) {x : Ordinal } (xa : odef A x) ( f : Ordinal → Ordinal ) : Set n where |
533 | 237 field |
534 | 238 y : Ordinal |
541 | 239 ay : odef B y |
534 | 240 x=fy : x ≡ f y |
529 | 241 |
570 | 242 record IsSup (A B : HOD) {x : Ordinal } (xa : odef A x) : Set n where |
654 | 243 field |
571 | 244 x<sup : {y : Ordinal} → odef B y → (y ≡ x ) ∨ (y << x ) |
568 | 245 |
656 | 246 record SUP ( A B : HOD ) : Set (Level.suc n) where |
247 field | |
248 sup : HOD | |
249 A∋maximal : A ∋ sup | |
250 x<sup : {x : HOD} → B ∋ x → (x ≡ sup ) ∨ (x < sup ) -- B is Total, use positive | |
251 | |
690 | 252 -- |
253 -- sup and its fclosure is in a chain HOD | |
254 -- chain HOD is sorted by sup as Ordinal and <-ordered | |
255 -- whole chain is a union of separated Chain | |
256 -- minimum index is y not ϕ | |
257 -- | |
258 | |
714 | 259 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 | 260 field |
739 | 261 csupz : FClosure A f (supf u) z |
756 | 262 supfu=u : supf u ≡ u |
263 fcy<sup : {z : Ordinal } → FClosure A f y z → z << supf u -- not a initial chain | |
714 | 264 order : {sup1 z1 : Ordinal} → (lt : sup1 o< u ) → FClosure A f (supf sup1 ) z1 → z1 << supf u |
694 | 265 |
266 -- Union of supf z which o< x | |
267 -- | |
690 | 268 |
748 | 269 data UChain ( A : HOD ) ( f : Ordinal → Ordinal ) (mf : ≤-monotonic-f A f) {y : Ordinal } (ay : odef A y ) |
270 (supf : Ordinal → Ordinal) (x : Ordinal) : (z : Ordinal) → Set n where | |
271 ch-init : {z : Ordinal } (fc : FClosure A f y z) → UChain A f mf ay supf x z | |
764 | 272 ch-is-sup : (u : Ordinal) {z : Ordinal } ( is-sup : ChainP A f mf ay supf u z) |
748 | 273 ( fc : FClosure A f (supf u) z ) → UChain A f mf ay supf x z |
694 | 274 |
275 ∈∧P→o< : {A : HOD } {y : Ordinal} → {P : Set n} → odef A y ∧ P → y o< & A | |
276 ∈∧P→o< {A } {y} p = subst (λ k → k o< & A) &iso ( c<→o< (subst (λ k → odef A k ) (sym &iso ) (proj1 p ))) | |
277 | |
278 UnionCF : ( A : HOD ) ( f : Ordinal → Ordinal ) (mf : ≤-monotonic-f A f) {y : Ordinal } (ay : odef A y ) | |
279 ( supf : Ordinal → Ordinal ) ( x : Ordinal ) → HOD | |
280 UnionCF A f mf ay supf x | |
281 = 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 | 282 |
703 | 283 record ZChain ( A : HOD ) ( f : Ordinal → Ordinal ) (mf : ≤-monotonic-f A f) |
284 {init : Ordinal} (ay : odef A init) ( z : Ordinal ) : Set (Level.suc n) where | |
655 | 285 field |
694 | 286 supf : Ordinal → Ordinal |
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mutual tranfinite in zorn
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287 chain : HOD |
703 | 288 chain = UnionCF A f mf ay supf z |
568 | 289 field |
290 chain⊆A : chain ⊆' A | |
653 | 291 chain∋init : odef chain init |
292 initial : {y : Ordinal } → odef chain y → * init ≤ * y | |
568 | 293 f-next : {a : Ordinal } → odef chain a → odef chain (f a) |
654 | 294 f-total : IsTotalOrderSet chain |
756 | 295 |
754 | 296 csupf : {z : Ordinal } → odef chain (supf z) |
761 | 297 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 |
756 | 298 fcy<sup : {u w : Ordinal } → u o< z → FClosure A f init w → w << supf u -- different from order because y o< supf |
761 | 299 order : {b sup1 z1 : Ordinal} → b o< z → sup1 o< b → FClosure A f (supf sup1) z1 → z1 << supf b |
756 | 300 |
653 | 301 |
728 | 302 record ZChain1 ( A : HOD ) ( f : Ordinal → Ordinal ) (mf : ≤-monotonic-f A f) |
303 {init : Ordinal} (ay : odef A init) (zc : ZChain A f mf ay (& A)) ( z : Ordinal ) : Set (Level.suc n) where | |
304 field | |
305 is-max : {a b : Ordinal } → (ca : odef (UnionCF A f mf ay (ZChain.supf zc) z) a ) → b o< z → (ab : odef A b) | |
306 → 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 | |
307 → * a < * b → odef ((UnionCF A f mf ay (ZChain.supf zc) z)) b | |
308 | |
568 | 309 record Maximal ( A : HOD ) : Set (Level.suc n) where |
310 field | |
311 maximal : HOD | |
312 A∋maximal : A ∋ maximal | |
313 ¬maximal<x : {x : HOD} → A ∋ x → ¬ maximal < x -- A is Partial, use negative | |
567 | 314 |
748 | 315 -- data UChain is total |
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parents:
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316 |
694 | 317 chain-total : (A : HOD ) ( f : Ordinal → Ordinal ) (mf : ≤-monotonic-f A f) {y : Ordinal} (ay : odef A y) (supf : Ordinal → Ordinal ) |
748 | 318 {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 | 319 chain-total A f mf {y} ay supf {xa} {xb} {a} {b} ca cb = ct-ind xa xb ca cb where |
748 | 320 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) |
321 ct-ind xa xb {a} {b} (ch-init fca) (ch-init fcb) = fcn-cmp y f mf fca fcb | |
764 | 322 ct-ind xa xb {a} {b} (ch-init fca) (ch-is-sup ub supb fcb) = tri< ct01 (λ eq → <-irr (case1 (sym eq)) ct01) (λ lt → <-irr (case2 ct01) lt) where |
748 | 323 ct00 : * a < * (supf ub) |
695 | 324 ct00 = ChainP.fcy<sup supb fca |
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325 ct01 : * a < * b |
748 | 326 ct01 with s≤fc (supf ub) f mf fcb |
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327 ... | case1 eq = subst (λ k → * a < k ) eq ct00 |
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328 ... | case2 lt = IsStrictPartialOrder.trans POO ct00 lt |
764 | 329 ct-ind xa xb {a} {b} (ch-is-sup ua supa fca) (ch-init fcb)= tri> (λ lt → <-irr (case2 ct01) lt) (λ eq → <-irr (case1 eq) ct01) ct01 where |
749 | 330 ct00 : * b < * (supf ua) |
331 ct00 = ChainP.fcy<sup supa fcb | |
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332 ct01 : * b < * a |
749 | 333 ct01 with s≤fc (supf ua) f mf fca |
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334 ... | case1 eq = subst (λ k → * b < k ) eq ct00 |
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335 ... | case2 lt = IsStrictPartialOrder.trans POO ct00 lt |
764 | 336 ct-ind xa xb {a} {b} (ch-is-sup ua supa fca) (ch-is-sup ub supb fcb) with trio< ua ub |
685 | 337 ... | tri< a₁ ¬b ¬c = tri< ct02 (λ eq → <-irr (case1 (sym eq)) ct02) (λ lt → <-irr (case2 ct02) lt) where |
748 | 338 ct03 : * a < * (supf ub) |
339 ct03 = ChainP.order supb a₁ (ChainP.csupz supa) | |
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340 ct02 : * a < * b |
748 | 341 ct02 with s≤fc (supf ub) f mf fcb |
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342 ... | case1 eq = subst (λ k → * a < k ) eq ct03 |
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343 ... | case2 lt = IsStrictPartialOrder.trans POO ct03 lt |
749 | 344 ... | tri≈ ¬a refl ¬c = fcn-cmp (supf ua) f mf fca fcb |
685 | 345 ... | tri> ¬a ¬b c = tri> (λ lt → <-irr (case2 ct04) lt) (λ eq → <-irr (case1 (eq)) ct04) ct04 where |
749 | 346 ct05 : * b < * (supf ua) |
347 ct05 = ChainP.order supa c (ChainP.csupz supb) | |
689
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348 ct04 : * b < * a |
749 | 349 ct04 with s≤fc (supf ua) f mf fca |
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350 ... | case1 eq = subst (λ k → * b < k ) eq ct05 |
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351 ... | case2 lt = IsStrictPartialOrder.trans POO ct05 lt |
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352 |
743 | 353 init-uchain : (A : HOD) ( f : Ordinal → Ordinal ) (mf : ≤-monotonic-f A f) {y : Ordinal } → (ay : odef A y ) |
354 { supf : Ordinal → Ordinal } { x : Ordinal } → odef (UnionCF A f mf ay supf x) y | |
748 | 355 init-uchain A f mf ay = ⟪ ay , ch-init (init ay) ⟫ |
743 | 356 |
698 | 357 ChainP-next : (A : HOD ) ( f : Ordinal → Ordinal ) (mf : ≤-monotonic-f A f) {y : Ordinal} (ay : odef A y) (supf : Ordinal → Ordinal ) |
358 → {x z : Ordinal } → ChainP A f mf ay supf x z → ChainP A f mf ay supf x (f z ) | |
756 | 359 ChainP-next A f mf {y} ay supf {x} {z} cp = record { supfu=u = ChainP.supfu=u cp |
746 | 360 ; fcy<sup = ChainP.fcy<sup cp ; csupz = fsuc _ (ChainP.csupz cp) ; order = ChainP.order cp } |
698 | 361 |
497 | 362 Zorn-lemma : { A : HOD } |
464 | 363 → o∅ o< & A |
568 | 364 → ( ( B : HOD) → (B⊆A : B ⊆' A) → IsTotalOrderSet B → SUP A B ) -- SUP condition |
497 | 365 → Maximal A |
552 | 366 Zorn-lemma {A} 0<A supP = zorn00 where |
571 | 367 <-irr0 : {a b : HOD} → A ∋ a → A ∋ b → (a ≡ b ) ∨ (a < b ) → b < a → ⊥ |
368 <-irr0 {a} {b} A∋a A∋b = <-irr | |
537 | 369 z07 : {y : Ordinal} → {P : Set n} → odef A y ∧ P → y o< & A |
370 z07 {y} p = subst (λ k → k o< & A) &iso ( c<→o< (subst (λ k → odef A k ) (sym &iso ) (proj1 p ))) | |
760 | 371 z09 : {b : Ordinal } { A : HOD } → odef A b → b o< & A |
372 z09 {b} {A} ab = subst (λ k → k o< & A) &iso ( c<→o< (subst (λ k → odef A k ) (sym &iso ) ab)) | |
530 | 373 s : HOD |
374 s = ODC.minimal O A (λ eq → ¬x<0 ( subst (λ k → o∅ o< k ) (=od∅→≡o∅ eq) 0<A )) | |
568 | 375 as : A ∋ * ( & s ) |
376 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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377 as0 : odef A (& s ) |
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378 as0 = subst (λ k → odef A k ) &iso as |
547 | 379 s<A : & s o< & A |
568 | 380 s<A = c<→o< (subst (λ k → odef A (& k) ) *iso as ) |
530 | 381 HasMaximal : HOD |
537 | 382 HasMaximal = record { od = record { def = λ x → odef A x ∧ ( (m : Ordinal) → odef A m → ¬ (* x < * m)) } ; odmax = & A ; <odmax = z07 } |
383 no-maximum : HasMaximal =h= od∅ → (x : Ordinal) → odef A x ∧ ((m : Ordinal) → odef A m → odef A x ∧ (¬ (* x < * m) )) → ⊥ | |
384 no-maximum nomx x P = ¬x<0 (eq→ nomx {x} ⟪ proj1 P , (λ m ma p → proj2 ( proj2 P m ma ) p ) ⟫ ) | |
532 | 385 Gtx : { x : HOD} → A ∋ x → HOD |
537 | 386 Gtx {x} ax = record { od = record { def = λ y → odef A y ∧ (x < (* y)) } ; odmax = & A ; <odmax = z07 } |
387 z08 : ¬ Maximal A → HasMaximal =h= od∅ | |
388 z08 nmx = record { eq→ = λ {x} lt → ⊥-elim ( nmx record {maximal = * x ; A∋maximal = subst (λ k → odef A k) (sym &iso) (proj1 lt) | |
389 ; ¬maximal<x = λ {y} ay → subst (λ k → ¬ (* x < k)) *iso (proj2 lt (& y) ay) } ) ; eq← = λ {y} lt → ⊥-elim ( ¬x<0 lt )} | |
390 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)) | |
391 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 | |
392 ¬x<m : ¬ (* x < * m) | |
393 ¬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 | 394 |
560 | 395 -- Uncountable ascending chain by axiom of choice |
530 | 396 cf : ¬ Maximal A → Ordinal → Ordinal |
532 | 397 cf nmx x with ODC.∋-p O A (* x) |
398 ... | no _ = o∅ | |
399 ... | yes ax with is-o∅ (& ( Gtx ax )) | |
538 | 400 ... | yes nogt = -- no larger element, so it is maximal |
401 ⊥-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 | 402 ... | no not = & (ODC.minimal O (Gtx ax) (λ eq → not (=od∅→≡o∅ eq))) |
537 | 403 is-cf : (nmx : ¬ Maximal A ) → {x : Ordinal} → odef A x → odef A (cf nmx x) ∧ ( * x < * (cf nmx x) ) |
404 is-cf nmx {x} ax with ODC.∋-p O A (* x) | |
405 ... | no not = ⊥-elim ( not (subst (λ k → odef A k ) (sym &iso) ax )) | |
406 ... | yes ax with is-o∅ (& ( Gtx ax )) | |
407 ... | 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 ⟫ ) | |
408 ... | no not = ODC.x∋minimal O (Gtx ax) (λ eq → not (=od∅→≡o∅ eq)) | |
606 | 409 |
410 --- | |
411 --- infintie ascention sequence of f | |
412 --- | |
530 | 413 cf-is-<-monotonic : (nmx : ¬ Maximal A ) → (x : Ordinal) → odef A x → ( * x < * (cf nmx x) ) ∧ odef A (cf nmx x ) |
537 | 414 cf-is-<-monotonic nmx x ax = ⟪ proj2 (is-cf nmx ax ) , proj1 (is-cf nmx ax ) ⟫ |
530 | 415 cf-is-≤-monotonic : (nmx : ¬ Maximal A ) → ≤-monotonic-f A ( cf nmx ) |
532 | 416 cf-is-≤-monotonic nmx x ax = ⟪ case2 (proj1 ( cf-is-<-monotonic nmx x ax )) , proj2 ( cf-is-<-monotonic nmx x ax ) ⟫ |
543 | 417 |
703 | 418 sp0 : ( f : Ordinal → Ordinal ) → (mf : ≤-monotonic-f A f ) (zc : ZChain A f mf as0 (& A) ) |
653 | 419 (total : IsTotalOrderSet (ZChain.chain zc) ) → SUP A (ZChain.chain zc) |
703 | 420 sp0 f mf zc total = supP (ZChain.chain zc) (ZChain.chain⊆A zc) total |
543 | 421 zc< : {x y z : Ordinal} → {P : Set n} → (x o< y → P) → x o< z → z o< y → P |
422 zc< {x} {y} {z} {P} prev x<z z<y = prev (ordtrans x<z z<y) | |
423 | |
728 | 424 SZ1 :( A : HOD ) ( f : Ordinal → Ordinal ) (mf : ≤-monotonic-f A f) |
425 {init : Ordinal} (ay : odef A init) (zc : ZChain A f mf ay (& A)) (x : Ordinal) → ZChain1 A f mf ay zc x | |
426 SZ1 A f mf {y} ay zc x = TransFinite { λ x → ZChain1 A f mf ay zc x } zc1 x where | |
734 | 427 chain-mono2 : (x : Ordinal) {a b c : Ordinal} → a o≤ b → b o≤ x → |
428 odef (UnionCF A f mf ay (ZChain.supf zc) a) c → odef (UnionCF A f mf ay (ZChain.supf zc) b) c | |
748 | 429 chain-mono2 x {a} {b} {c} a≤b b≤x ⟪ ua , ch-init fc ⟫ = |
430 ⟪ ua , ch-init fc ⟫ | |
764 | 431 chain-mono2 x {a} {b} {c} a≤b b≤x ⟪ uaa , ch-is-sup ua is-sup fc ⟫ = |
432 ⟪ uaa , ch-is-sup ua is-sup fc ⟫ | |
743 | 433 chain<ZA : {x : Ordinal } → UnionCF A f mf ay (ZChain.supf zc) x ⊆' UnionCF A f mf ay (ZChain.supf zc) (& A) |
748 | 434 chain<ZA {x} ux with proj2 ux |
435 ... | ch-init fc = ⟪ proj1 ux , ch-init fc ⟫ | |
764 | 436 ... | ch-is-sup u is-sup fc = ⟪ proj1 ux , ch-is-sup u is-sup fc ⟫ |
735 | 437 is-max-hp : (x : Ordinal) {a : Ordinal} {b : Ordinal} → odef (UnionCF A f mf ay (ZChain.supf zc) x) a → |
438 b o< x → (ab : odef A b) → | |
439 HasPrev A (UnionCF A f mf ay (ZChain.supf zc) x) ab f → | |
440 * a < * b → odef (UnionCF A f mf ay (ZChain.supf zc) x) b | |
749 | 441 is-max-hp x {a} {b} ua b<x ab has-prev a<b with HasPrev.ay has-prev |
442 ... | ⟪ ab0 , ch-init fc ⟫ = ⟪ ab , ch-init ( subst (λ k → FClosure A f y k) (sym (HasPrev.x=fy has-prev)) (fsuc _ fc )) ⟫ | |
764 | 443 ... | ⟪ ab0 , ch-is-sup u is-sup fc ⟫ = ⟪ ab , |
749 | 444 subst (λ k → UChain A f mf ay (ZChain.supf zc) x k ) |
764 | 445 (sym (HasPrev.x=fy has-prev)) ( ch-is-sup u (ChainP-next A f mf ay _ is-sup) (fsuc _ fc)) ⟫ |
728 | 446 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
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|
447 zc1 x prev with Oprev-p x |
756 | 448 ... | yes op = record { is-max = is-max } where |
732
ddeb107b6f71
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parents:
729
diff
changeset
|
449 px = Oprev.oprev op |
735 | 450 zc-b<x : (b : Ordinal ) → b o< x → b o< osuc px |
451 zc-b<x b lt = subst (λ k → b o< k ) (sym (Oprev.oprev=x op)) lt | |
728 | 452 is-max : {a : Ordinal} {b : Ordinal} → odef (UnionCF A f mf ay (ZChain.supf zc) x) a → |
453 b o< x → (ab : odef A b) → | |
454 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 → | |
455 * a < * b → odef (UnionCF A f mf ay (ZChain.supf zc) x) b | |
735 | 456 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 | 457 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 | 458 ... | case1 has-prev = is-max-hp x {a} {b} ua b<x ab has-prev a<b |
734 | 459 ... | case2 ¬fy<x = m01 where |
735 | 460 px<x : px o< x |
461 px<x = subst (λ k → px o< k ) (Oprev.oprev=x op) <-osuc | |
728 | 462 m01 : odef (UnionCF A f mf ay (ZChain.supf zc) x) b |
736 | 463 m01 with trio< b px --- px < b < x |
464 ... | tri> ¬a ¬b c = ⊥-elim (¬p<x<op ⟪ c , subst (λ k → b o< k ) (sym (Oprev.oprev=x op)) b<x ⟫) | |
735 | 465 ... | 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 | 466 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 | 467 m03 with proj2 ua |
468 ... | ch-init fc = ⟪ proj1 ua , ch-init fc ⟫ | |
764 | 469 ... | ch-is-sup u is-sup-a fc with trio< u px |
470 ... | tri< a ¬b ¬c = ⟪ proj1 ua , ch-is-sup u is-sup-a fc ⟫ -- u o< osuc x | |
471 ... | tri≈ ¬a u=px ¬c = ⟪ proj1 ua , ch-is-sup u is-sup-a fc ⟫ | |
761 | 472 ... | tri> ¬a ¬b c = ⊥-elim (<-irr u≤a (ptrans a<b b<u) ) where |
762 | 473 -- a and b is a sup of chain, order forces minimulity of sup |
761 | 474 su=u : ZChain.supf zc u ≡ u |
475 su=u = ChainP.supfu=u is-sup-a | |
476 u<A : u o< & A | |
477 u<A = z09 (subst (λ k → odef A k ) su=u (proj1 (ZChain.csupf zc ))) | |
478 u≤a : (* u ≡ * a) ∨ (u << a) | |
479 u≤a = s≤fc u f mf (subst (λ k → FClosure A f k a) su=u fc ) | |
480 m07 : osuc b o≤ x | |
481 m07 = osucc (ordtrans b<px px<x ) | |
482 fcb : FClosure A f (ZChain.supf zc b) b | |
483 fcb = subst (λ k → FClosure A f k b ) (sym (ZChain.sup=u zc ab (z09 ab) | |
484 (record {x<sup = λ {z} lt → IsSup.x<sup is-sup (chain-mono2 x m07 o≤-refl lt) } ) )) ( init ab ) | |
485 b<u : b << u | |
486 b<u = subst (λ k → b << k ) su=u ( ZChain.order zc u<A (ordtrans b<px c) fcb ) | |
728 | 487 m04 : odef (UnionCF A f mf ay (ZChain.supf zc) px) b |
735 | 488 m04 = ZChain1.is-max (prev px px<x) m03 b<px ab |
489 (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 | 490 ... | tri≈ ¬a b=px ¬c = ⟪ ab , ch-is-sup b m06 (subst (λ k → FClosure A f k b) m05 (init ab)) ⟫ where |
763 | 491 b<A : b o< & A |
492 b<A = z09 ab | |
760 | 493 m05 : b ≡ ZChain.supf zc b |
761 | 494 m05 = sym ( ZChain.sup=u zc ab (z09 ab) |
760 | 495 record { x<sup = λ {z} uz → IsSup.x<sup is-sup (chain-mono2 x (osucc b<x) o≤-refl uz ) } ) |
763 | 496 m08 : {z : Ordinal} → (fcz : FClosure A f y z ) → z << ZChain.supf zc b |
497 m08 {z} fcz = ZChain.fcy<sup zc b<A fcz | |
498 m09 : {sup1 z1 : Ordinal} → sup1 o< b → FClosure A f (ZChain.supf zc sup1) z1 → z1 << ZChain.supf zc b | |
499 m09 {sup1} {z} s<b fcz = ZChain.order zc b<A s<b fcz | |
762 | 500 m06 : ChainP A f mf ay (ZChain.supf zc) b b |
501 m06 = record { csupz = subst (λ k → FClosure A f k b) m05 (init ab) ; supfu=u = sym m05 | |
763 | 502 ; fcy<sup = m08 ; order = m09 } |
756 | 503 ... | no lim = record { is-max = is-max } where |
734 | 504 is-max : {a : Ordinal} {b : Ordinal} → odef (UnionCF A f mf ay (ZChain.supf zc) x) a → |
505 b o< x → (ab : odef A b) → | |
506 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 → | |
507 * a < * b → odef (UnionCF A f mf ay (ZChain.supf zc) x) b | |
735 | 508 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 | 509 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 ) |
510 ... | case1 b=y = ⊥-elim ( <-irr ( ZChain.initial zc (chain<ZA (chain-mono2 (osuc x) (o<→≤ <-osuc ) o≤-refl ua )) ) | |
511 (subst (λ k → * a < * k ) (sym b=y) a<b ) ) | |
744 | 512 ... | case2 y<b = chain-mono2 x (o<→≤ (ob<x lim b<x) ) o≤-refl m04 where |
759 | 513 m09 : b o< & A |
514 m09 = subst (λ k → k o< & A) &iso ( c<→o< (subst (λ k → odef A k ) (sym &iso ) ab)) | |
740 | 515 m07 : {z : Ordinal} → FClosure A f y z → z << ZChain.supf zc b |
759 | 516 m07 {z} fc = ZChain.fcy<sup zc m09 fc |
741 | 517 m08 : {sup1 z1 : Ordinal} → sup1 o< b → FClosure A f (ZChain.supf zc sup1) z1 → z1 << ZChain.supf zc b |
761 | 518 m08 {sup1} {z1} s<b fc = ZChain.order zc m09 s<b fc |
735 | 519 m05 : b ≡ ZChain.supf zc b |
761 | 520 m05 = sym (ZChain.sup=u zc ab m09 |
756 | 521 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 | 522 m06 : ChainP A f mf ay (ZChain.supf zc) b b |
756 | 523 m06 = record { fcy<sup = m07 ; csupz = subst (λ k → FClosure A f k b ) m05 (init ab) ; order = m08 |
744 | 524 ; supfu=u = sym m05 } |
735 | 525 m04 : odef (UnionCF A f mf ay (ZChain.supf zc) (osuc b)) b |
764 | 526 m04 = ⟪ ab , ch-is-sup b m06 (subst (λ k → FClosure A f k b) m05 (init ab)) ⟫ |
727 | 527 |
543 | 528 --- |
560 | 529 --- the maximum chain has fix point of any ≤-monotonic function |
543 | 530 --- |
703 | 531 fixpoint : ( f : Ordinal → Ordinal ) → (mf : ≤-monotonic-f A f ) (zc : ZChain A f mf as0 (& A) ) |
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532 → (total : IsTotalOrderSet (ZChain.chain zc) ) |
703 | 533 → f (& (SUP.sup (sp0 f mf zc total ))) ≡ & (SUP.sup (sp0 f mf zc total)) |
534 fixpoint f mf zc total = z14 where | |
538 | 535 chain = ZChain.chain zc |
703 | 536 sp1 = sp0 f mf zc total |
712 | 537 z10 : {a b : Ordinal } → (ca : odef chain a ) → b o< & A → (ab : odef A b ) |
570 | 538 → HasPrev A chain ab f ∨ IsSup A chain {b} ab -- (supO chain (ZChain.chain⊆A zc) (ZChain.f-total zc) ≡ b ) |
538 | 539 → * a < * b → odef chain b |
728 | 540 z10 = ZChain1.is-max (SZ1 A f mf as0 zc (& A) ) |
543 | 541 z11 : & (SUP.sup sp1) o< & A |
542 z11 = c<→o< ( SUP.A∋maximal sp1) | |
538 | 543 z12 : odef chain (& (SUP.sup sp1)) |
544 z12 with o≡? (& s) (& (SUP.sup sp1)) | |
653 | 545 ... | yes eq = subst (λ k → odef chain k) eq ( ZChain.chain∋init zc ) |
712 | 546 ... | no ne = z10 {& s} {& (SUP.sup sp1)} ( ZChain.chain∋init zc ) z11 (SUP.A∋maximal sp1) |
570 | 547 (case2 z19 ) z13 where |
538 | 548 z13 : * (& s) < * (& (SUP.sup sp1)) |
653 | 549 z13 with SUP.x<sup sp1 ( ZChain.chain∋init zc ) |
538 | 550 ... | case1 eq = ⊥-elim ( ne (cong (&) eq) ) |
551 ... | case2 lt = subst₂ (λ j k → j < k ) (sym *iso) (sym *iso) lt | |
570 | 552 z19 : IsSup A chain {& (SUP.sup sp1)} (SUP.A∋maximal sp1) |
571 | 553 z19 = record { x<sup = z20 } where |
554 z20 : {y : Ordinal} → odef chain y → (y ≡ & (SUP.sup sp1)) ∨ (y << & (SUP.sup sp1)) | |
555 z20 {y} zy with SUP.x<sup sp1 (subst (λ k → odef chain k ) (sym &iso) zy) | |
570 | 556 ... | case1 y=p = case1 (subst (λ k → k ≡ _ ) &iso ( cong (&) y=p )) |
557 ... | case2 y<p = case2 (subst (λ k → * y < k ) (sym *iso) y<p ) | |
558 -- λ {y} zy → subst (λ k → (y ≡ & k ) ∨ (y << & k)) ? (SUP.x<sup sp1 ? ) } | |
703 | 559 z14 : f (& (SUP.sup (sp0 f mf zc total ))) ≡ & (SUP.sup (sp0 f mf zc total )) |
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560 z14 with total (subst (λ k → odef chain k) (sym &iso) (ZChain.f-next zc z12 )) z12 |
631 | 561 ... | tri< a ¬b ¬c = ⊥-elim z16 where |
562 z16 : ⊥ | |
563 z16 with proj1 (mf (& ( SUP.sup sp1)) ( SUP.A∋maximal sp1 )) | |
564 ... | case1 eq = ⊥-elim (¬b (subst₂ (λ j k → j ≡ k ) refl *iso (sym eq) )) | |
565 ... | case2 lt = ⊥-elim (¬c (subst₂ (λ j k → k < j ) refl *iso lt )) | |
566 ... | tri≈ ¬a b ¬c = subst ( λ k → k ≡ & (SUP.sup sp1) ) &iso ( cong (&) b ) | |
567 ... | tri> ¬a ¬b c = ⊥-elim z17 where | |
568 z15 : (* (f ( & ( SUP.sup sp1 ))) ≡ SUP.sup sp1) ∨ (* (f ( & ( SUP.sup sp1 ))) < SUP.sup sp1) | |
569 z15 = SUP.x<sup sp1 (subst (λ k → odef chain k ) (sym &iso) (ZChain.f-next zc z12 )) | |
570 z17 : ⊥ | |
571 z17 with z15 | |
572 ... | case1 eq = ¬b eq | |
573 ... | case2 lt = ¬a lt | |
560 | 574 |
575 -- ZChain contradicts ¬ Maximal | |
576 -- | |
571 | 577 -- ZChain forces fix point on any ≤-monotonic function (fixpoint) |
560 | 578 -- ¬ Maximal create cf which is a <-monotonic function by axiom of choice. This contradicts fix point of ZChain |
579 -- | |
697 | 580 z04 : (nmx : ¬ Maximal A ) |
703 | 581 → (zc : ZChain A (cf nmx) (cf-is-≤-monotonic nmx) as0 (& A)) |
664 | 582 → IsTotalOrderSet (ZChain.chain zc) → ⊥ |
703 | 583 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 | 584 (subst (λ k → odef A (& k)) (sym *iso) (SUP.A∋maximal sp1) ) |
703 | 585 (case1 ( cong (*)( fixpoint (cf nmx) (cf-is-≤-monotonic nmx ) zc total ))) -- x ≡ f x ̄ |
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586 (proj1 (cf-is-<-monotonic nmx c (SUP.A∋maximal sp1 ))) where -- x < f x |
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587 sp1 : SUP A (ZChain.chain zc) |
703 | 588 sp1 = sp0 (cf nmx) (cf-is-≤-monotonic nmx) zc total |
538 | 589 c = & (SUP.sup sp1) |
548 | 590 |
757 | 591 uchain : ( f : Ordinal → Ordinal ) → (mf : ≤-monotonic-f A f ) {y : Ordinal} (ay : odef A y) → HOD |
592 uchain f mf {y} ay = record { od = record { def = λ x → FClosure A f y x } ; odmax = & A ; <odmax = | |
593 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 ))) } | |
594 | |
595 utotal : ( f : Ordinal → Ordinal ) → (mf : ≤-monotonic-f A f ) {y : Ordinal} (ay : odef A y) | |
596 → IsTotalOrderSet (uchain f mf ay) | |
597 utotal f mf {y} ay {a} {b} ca cb = subst₂ (λ j k → Tri (j < k) (j ≡ k) (k < j)) *iso *iso uz01 where | |
598 uz01 : Tri (* (& a) < * (& b)) (* (& a) ≡ * (& b)) (* (& b) < * (& a) ) | |
599 uz01 = fcn-cmp y f mf ca cb | |
600 | |
601 ysup : ( f : Ordinal → Ordinal ) → (mf : ≤-monotonic-f A f ) {y : Ordinal} (ay : odef A y) | |
602 → SUP A (uchain f mf ay) | |
603 ysup f mf {y} ay = supP (uchain f mf ay) (λ lt → A∋fc y f mf lt) (utotal f mf ay) | |
604 | |
711 | 605 inititalChain : ( f : Ordinal → Ordinal ) → (mf : ≤-monotonic-f A f ) {y : Ordinal} (ay : odef A y) → ZChain A f mf ay o∅ |
756 | 606 inititalChain f mf {y} ay = record { supf = isupf ; chain⊆A = λ lt → proj1 lt ; chain∋init = cy ; csupf = ? ; fcy<sup = ? |
761 | 607 ; 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 | 608 spi = & (SUP.sup (ysup f mf ay)) |
711 | 609 isupf : Ordinal → Ordinal |
764 | 610 isupf z with trio< z spi |
611 ... | tri< a ¬b ¬c = y | |
612 ... | tri≈ ¬a b ¬c = spi | |
613 ... | tri> ¬a ¬b c = spi | |
763 | 614 sp = ysup f mf ay |
711 | 615 cy : odef (UnionCF A f mf ay isupf o∅) y |
750 | 616 cy = ⟪ ay , ch-init (init ay) ⟫ |
759 | 617 y<sup : * y ≤ SUP.sup (ysup f mf ay) |
618 y<sup = SUP.x<sup (ysup f mf ay) (subst (λ k → FClosure A f y k ) (sym &iso) (init ay)) | |
711 | 619 isy : {z : Ordinal } → odef (UnionCF A f mf ay isupf o∅) z → * y ≤ * z |
748 | 620 isy {z} ⟪ az , uz ⟫ with uz |
621 ... | ch-init fc = s≤fc y f mf fc | |
764 | 622 ... | 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 ? ) |
711 | 623 inext : {a : Ordinal} → odef (UnionCF A f mf ay isupf o∅) a → odef (UnionCF A f mf ay isupf o∅) (f a) |
748 | 624 inext {a} ua with (proj2 ua) |
625 ... | ch-init fc = ⟪ proj2 (mf _ (proj1 ua)) , ch-init (fsuc _ fc ) ⟫ | |
764 | 626 ... | 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 | 627 itotal : IsTotalOrderSet (UnionCF A f mf ay isupf o∅) |
628 itotal {a} {b} ca cb = subst₂ (λ j k → Tri (j < k) (j ≡ k) (k < j)) *iso *iso uz01 where | |
629 uz01 : Tri (* (& a) < * (& b)) (* (& a) ≡ * (& b)) (* (& b) < * (& a) ) | |
763 | 630 uz01 = chain-total A f mf ay isupf (proj2 ca) (proj2 cb) |
631 | |
632 csupf : {z : Ordinal} → odef (UnionCF A f mf ay isupf o∅) (isupf z) | |
764 | 633 csupf {z} with trio< z spi |
634 ... | tri< a ¬b ¬c = ⟪ ay , ch-init (init ay ) ⟫ | |
635 ... | tri≈ ¬a b ¬c = ? | |
636 ... | tri> ¬a ¬b c = ⟪ SUP.A∋maximal sp , ch-is-sup spi ? ? ⟫ where | |
637 uz03 : {z : Ordinal} → FClosure A f y z → z << isupf spi | |
638 uz03 {z} fcz with SUP.x<sup sp (subst (λ k → FClosure A f y k) (sym &iso) fcz) | |
639 ... | case2 lt = ? -- subst (λ k → * z < k ) (sym *iso) lt | |
640 ... | case1 eq = ? -- ⊥-elim (<-irr (case1 e) | |
641 uz04 : {sup1 z1 : Ordinal} → sup1 o< spi → FClosure A f (isupf sup1) z1 → z1 << isupf spi | |
642 uz04 {_} {z} _ fcz = ? | |
643 uz02 : ChainP A f mf ay isupf spi spi | |
644 uz02 = ? -- record { csupz = init (SUP.A∋maximal sp) ; supfu=u = refl ; fcy<sup = uz03 ; order = uz04 } | |
711 | 645 |
560 | 646 -- |
547 | 647 -- create all ZChains under o< x |
560 | 648 -- |
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649 |
674 | 650 ind : ( f : Ordinal → Ordinal ) → (mf : ≤-monotonic-f A f ) {y : Ordinal} (ay : odef A y) → (x : Ordinal) |
703 | 651 → ((z : Ordinal) → z o< x → ZChain A f mf ay z) → ZChain A f mf ay x |
707 | 652 ind f mf {y} ay x prev with Oprev-p x |
697 | 653 ... | yes op = zc4 where |
682 | 654 -- |
655 -- we have previous ordinal to use induction | |
656 -- | |
657 px = Oprev.oprev op | |
703 | 658 zc : ZChain A f mf ay (Oprev.oprev op) |
682 | 659 zc = prev px (subst (λ k → px o< k) (Oprev.oprev=x op) <-osuc ) |
660 px<x : px o< x | |
661 px<x = subst (λ k → px o< k) (Oprev.oprev=x op) <-osuc | |
709 | 662 zc-b<x : (b : Ordinal ) → b o< x → b o< osuc px |
663 zc-b<x b lt = subst (λ k → b o< k ) (sym (Oprev.oprev=x op)) lt | |
697 | 664 |
703 | 665 pchain : HOD |
666 pchain = UnionCF A f mf ay (ZChain.supf zc) x | |
667 ptotal : IsTotalOrderSet pchain | |
668 ptotal {a} {b} ca cb = subst₂ (λ j k → Tri (j < k) (j ≡ k) (k < j)) *iso *iso uz01 where | |
669 uz01 : Tri (* (& a) < * (& b)) (* (& a) ≡ * (& b)) (* (& b) < * (& a) ) | |
748 | 670 uz01 = chain-total A f mf ay (ZChain.supf zc) ( (proj2 ca)) ( (proj2 cb)) |
704 | 671 pchain⊆A : {y : Ordinal} → odef pchain y → odef A y |
672 pchain⊆A {y} ny = proj1 ny | |
673 pnext : {a : Ordinal} → odef pchain a → odef pchain (f a) | |
749 | 674 pnext {a} ⟪ aa , ch-init fc ⟫ = ⟪ proj2 (mf a aa) , ch-init (fsuc _ fc) ⟫ |
764 | 675 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 | 676 pinit : {y₁ : Ordinal} → odef pchain y₁ → * y ≤ * y₁ |
748 | 677 pinit {a} ⟪ aa , ua ⟫ with ua |
678 ... | ch-init fc = s≤fc y f mf fc | |
764 | 679 ... | ch-is-sup u is-sup fc = ≤-ftrans (case2 zc7) (s≤fc _ f mf fc) where |
749 | 680 zc7 : y << (ZChain.supf zc) u |
707 | 681 zc7 = ChainP.fcy<sup is-sup (init ay) |
704 | 682 pcy : odef pchain y |
748 | 683 pcy = ⟪ ay , ch-init (init ay) ⟫ |
703 | 684 |
754 | 685 supf0 = ZChain.supf zc |
686 | |
687 csupf : {z : Ordinal} → odef (UnionCF A f mf ay supf0 x) (supf0 z) | |
688 csupf {z} with ZChain.csupf zc {z} | |
689 ... | ⟪ az , ch-init fc ⟫ = ⟪ az , ch-init fc ⟫ | |
764 | 690 ... | ⟪ az , ch-is-sup u is-sup fc ⟫ = ⟪ az , ch-is-sup u is-sup fc ⟫ |
745 | 691 |
611 | 692 -- if previous chain satisfies maximality, we caan reuse it |
693 -- | |
727 | 694 no-extension : ZChain A f mf ay x |
745 | 695 no-extension = record { supf = supf0 |
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parents:
757
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696 ; initial = pinit ; chain∋init = pcy ; csupf = csupf ; sup=u = ? ; order = ? ; fcy<sup = ? |
754 | 697 ; chain⊆A = pchain⊆A ; f-next = pnext ; f-total = ptotal } |
709 | 698 |
703 | 699 zc4 : ZChain A f mf ay x |
713 | 700 zc4 with ODC.∋-p O A (* px) |
727 | 701 ... | no noapx = no-extension -- ¬ A ∋ p, just skip |
713 | 702 ... | yes apx with ODC.p∨¬p O ( HasPrev A (ZChain.chain zc ) apx f ) |
703 | 703 -- we have to check adding x preserve is-max ZChain A y f mf x |
727 | 704 ... | case1 pr = no-extension -- we have previous A ∋ z < x , f z ≡ x, so chain ∋ f z ≡ x because of f-next |
713 | 705 ... | case2 ¬fy<x with ODC.p∨¬p O (IsSup A (ZChain.chain zc ) apx ) |
682 | 706 ... | case1 is-sup = -- x is a sup of zc |
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707 record { supf = psupf1 ; chain⊆A = ? ; f-next = ? ; f-total = ? ; csupf = ? ; sup=u = ? ; order = ? ; fcy<sup = ? |
754 | 708 ; initial = ? ; chain∋init = ? } where |
750 | 709 psupf1 : Ordinal → Ordinal |
710 psupf1 z with trio< z x | |
711 ... | tri< a ¬b ¬c = ZChain.supf zc z | |
712 ... | tri≈ ¬a b ¬c = x | |
713 ... | tri> ¬a ¬b c = x | |
727 | 714 ... | case2 ¬x=sup = no-extension -- px is not f y' nor sup of former ZChain from y -- no extention |
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715 |
728 | 716 ... | no lim = zc5 where |
726
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717 |
703 | 718 pzc : (z : Ordinal) → z o< x → ZChain A f mf ay z |
719 pzc z z<x = prev z z<x | |
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720 |
703 | 721 psupf0 : (z : Ordinal) → Ordinal |
722 psupf0 z with trio< z x | |
755 | 723 ... | tri< a ¬b ¬c = ZChain.supf (pzc (osuc z) (ob<x lim a)) z |
724 ... | tri≈ ¬a b ¬c = & A -- Sup of FClosure A f y z ? | |
725 ... | tri> ¬a ¬b c = & A -- | |
726 | |
727 pchain0 : HOD | |
728 pchain0 = UnionCF A f mf ay psupf0 x | |
729 | |
730 ptotal0 : IsTotalOrderSet pchain0 | |
731 ptotal0 {a} {b} ca cb = subst₂ (λ j k → Tri (j < k) (j ≡ k) (k < j)) *iso *iso uz01 where | |
732 uz01 : Tri (* (& a) < * (& b)) (* (& a) ≡ * (& b)) (* (& b) < * (& a) ) | |
733 uz01 = chain-total A f mf ay psupf0 ( (proj2 ca)) ( (proj2 cb)) | |
734 | |
735 | |
736 usup : SUP A pchain0 | |
737 usup = supP pchain0 (λ lt → proj1 lt) ptotal0 | |
738 spu = & (SUP.sup usup) | |
739 | |
740 psupf : Ordinal → Ordinal | |
741 psupf z with trio< z x | |
742 ... | tri< a ¬b ¬c = ZChain.supf (pzc (osuc z) (ob<x lim a)) z | |
743 ... | tri≈ ¬a b ¬c = spu | |
744 ... | tri> ¬a ¬b c = spu | |
745 | |
746 psupf>z : {z : Ordinal } → x o< z → spu ≡ psupf z | |
747 psupf>z {z} x<z with trio< z x | |
748 ... | tri< a ¬b ¬c = ⊥-elim ( ¬c x<z) | |
749 ... | tri≈ ¬a b ¬c = ⊥-elim ( ¬c x<z) | |
750 ... | tri> ¬a ¬b c = refl | |
751 | |
752 psupf=x : spu ≡ psupf x | |
753 psupf=x = zc20 refl where | |
754 zc20 : {z : Ordinal } → z ≡ x → spu ≡ psupf x | |
755 zc20 {z} z=x with trio< z x | inspect psupf z | |
756 ... | tri< a ¬b ¬c | _ = ⊥-elim ( ¬b z=x) | |
757 ... | tri≈ ¬a b ¬c | record { eq = eq1 } = subst (λ k → spu ≡ psupf k) b (sym eq1) | |
758 ... | tri> ¬a ¬b c | _ = ⊥-elim ( ¬b z=x) | |
759 | |
760 csupf :{z : Ordinal} → odef (UnionCF A f mf ay psupf x) (psupf z) | |
761 csupf {z} with trio< z x | inspect psupf z | |
762 ... | tri< z<x ¬b ¬c | record { eq = eq1 } = zc11 where | |
763 ozc = pzc (osuc z) (ob<x lim z<x) | |
764 zc12 : odef A (ZChain.supf ozc z) | |
765 ∧ UChain A f mf ay (ZChain.supf ozc) (osuc z) (ZChain.supf ozc z) | |
766 zc12 = ZChain.csupf ozc {z} | |
767 zc11 : odef A (ZChain.supf ozc z) ∧ UChain A f mf ay psupf x (ZChain.supf ozc z) | |
768 zc11 with zc12 | |
769 ... | ⟪ az , ch-init fc ⟫ = ⟪ az , ch-init fc ⟫ | |
764 | 770 ... | ⟪ az , ch-is-sup u is-sup fc ⟫ = ⟪ az , ch-is-sup z |
755 | 771 zc14 (subst (λ k → FClosure A f k (ZChain.supf ozc z)) (sym eq1) (init az)) ⟫ where |
772 zc14 : ChainP A f mf ay psupf z (ZChain.supf ozc z) | |
773 zc14 = ? | |
764 | 774 ... | tri≈ ¬a b ¬c | record { eq = eq1 } = ⟪ SUP.A∋maximal usup , ch-is-sup x zc15 |
755 | 775 (subst (λ k → FClosure A f k spu) zc17 (init (SUP.A∋maximal usup))) ⟫ where |
776 zc15 : ChainP A f mf ay psupf x spu | |
777 zc15 = ? | |
778 zc17 : spu ≡ psupf x | |
779 zc17 = subst (λ k → spu ≡ psupf k ) b (sym eq1) | |
764 | 780 ... | tri> ¬a ¬b c | record { eq = eq1 } = ⟪ SUP.A∋maximal usup , ch-is-sup x zc16 |
755 | 781 (subst (λ k → FClosure A f k spu) psupf=x (init (SUP.A∋maximal usup))) ⟫ where |
782 zc16 : ChainP A f mf ay psupf x spu | |
783 zc16 = ? | |
726
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psupf-mono and is-max conflict
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parents:
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784 |
704 | 785 pchain : HOD |
755 | 786 pchain = UnionCF A f mf ay psupf x |
704 | 787 |
788 pchain⊆A : {y : Ordinal} → odef pchain y → odef A y | |
789 pchain⊆A {y} ny = proj1 ny | |
790 pnext : {a : Ordinal} → odef pchain a → odef pchain (f a) | |
750 | 791 pnext {a} ⟪ aa , ch-init fc ⟫ = ⟪ proj2 ( mf a aa ) , ch-init (fsuc _ fc) ⟫ |
764 | 792 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 | 793 pinit : {y₁ : Ordinal} → odef pchain y₁ → * y ≤ * y₁ |
748 | 794 pinit {a} ⟪ aa , ua ⟫ with ua |
795 ... | ch-init fc = s≤fc y f mf fc | |
764 | 796 ... | ch-is-sup u is-sup fc = ≤-ftrans (case2 zc7) (s≤fc _ f mf fc) where |
762 | 797 zc7 : y << psupf _ |
707 | 798 zc7 = ChainP.fcy<sup is-sup (init ay) |
704 | 799 pcy : odef pchain y |
748 | 800 pcy = ⟪ ay , ch-init (init ay) ⟫ |
755 | 801 ptotal : IsTotalOrderSet pchain |
802 ptotal {a} {b} ca cb = subst₂ (λ j k → Tri (j < k) (j ≡ k) (k < j)) *iso *iso uz01 where | |
803 uz01 : Tri (* (& a) < * (& b)) (* (& a) ≡ * (& b)) (* (& b) < * (& a) ) | |
804 uz01 = chain-total A f mf ay psupf ( (proj2 ca)) ( (proj2 cb)) | |
754 | 805 |
758
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parents:
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806 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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807 b o< x → (ab : odef A b) → |
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parents:
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808 HasPrev A (UnionCF A f mf ay supf x) ab f → |
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diff
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|
809 * a < * b → odef (UnionCF A f mf ay supf x) b |
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810 is-max-hp supf x {a} {b} ua b<x ab has-prev a<b with HasPrev.ay has-prev |
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parents:
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diff
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811 ... | ⟪ ab0 , ch-init fc ⟫ = ⟪ ab , ch-init ( subst (λ k → FClosure A f y k) (sym (HasPrev.x=fy has-prev)) (fsuc _ fc )) ⟫ |
764 | 812 ... | ⟪ ab0 , ch-is-sup u is-sup fc ⟫ = ⟪ ab , |
758
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parents:
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813 subst (λ k → UChain A f mf ay supf x k ) |
764 | 814 (sym (HasPrev.x=fy has-prev)) ( ch-is-sup u (ChainP-next A f mf ay _ is-sup) (fsuc _ fc)) ⟫ |
758
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parents:
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815 |
754 | 816 no-extension : ZChain A f mf ay x |
756 | 817 no-extension = record { initial = pinit ; chain∋init = pcy ; supf = psupf ; csupf = csupf ; sup=u = ? ; order = ? ; fcy<sup = ? |
755 | 818 ; chain⊆A = pchain⊆A ; f-next = pnext ; f-total = ptotal } |
754 | 819 |
703 | 820 zc5 : ZChain A f mf ay x |
697 | 821 zc5 with ODC.∋-p O A (* x) |
732
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parents:
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822 ... | no noax = no-extension -- ¬ A ∋ p, just skip |
704 | 823 ... | yes ax with ODC.p∨¬p O ( HasPrev A pchain ax f ) |
703 | 824 -- we have to check adding x preserve is-max ZChain A y f mf x |
727 | 825 ... | case1 pr = no-extension |
704 | 826 ... | case2 ¬fy<x with ODC.p∨¬p O (IsSup A pchain ax ) |
756 | 827 ... | case1 is-sup = record { initial = {!!} ; chain∋init = {!!} ; supf = psupf1 ; csupf = ? ; sup=u = ? ; order = ? ; fcy<sup = ? |
739 | 828 ; chain⊆A = {!!} ; f-next = {!!} ; f-total = ? } where -- x is a sup of (zc ?) |
728 | 829 psupf1 : Ordinal → Ordinal |
830 psupf1 z with trio< z x | |
831 ... | tri< a ¬b ¬c = ZChain.supf (pzc z a) z | |
832 ... | tri≈ ¬a b ¬c = x | |
833 ... | tri> ¬a ¬b c = x | |
727 | 834 ... | case2 ¬x=sup = no-extension -- x is not f y' nor sup of former ZChain from y -- no extention |
553 | 835 |
703 | 836 SZ : ( f : Ordinal → Ordinal ) → (mf : ≤-monotonic-f A f ) → {y : Ordinal} (ay : odef A y) → ZChain A f mf ay (& A) |
837 SZ f mf {y} ay = TransFinite {λ z → ZChain A f mf ay z } (λ x → ind f mf ay x ) (& A) | |
608
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838 |
551 | 839 zorn00 : Maximal A |
840 zorn00 with is-o∅ ( & HasMaximal ) -- we have no Level (suc n) LEM | |
841 ... | no not = record { maximal = ODC.minimal O HasMaximal (λ eq → not (=od∅→≡o∅ eq)) ; A∋maximal = zorn01 ; ¬maximal<x = zorn02 } where | |
842 -- yes we have the maximal | |
843 zorn03 : odef HasMaximal ( & ( ODC.minimal O HasMaximal (λ eq → not (=od∅→≡o∅ eq)) ) ) | |
606 | 844 zorn03 = ODC.x∋minimal O HasMaximal (λ eq → not (=od∅→≡o∅ eq)) -- Axiom of choice |
551 | 845 zorn01 : A ∋ ODC.minimal O HasMaximal (λ eq → not (=od∅→≡o∅ eq)) |
846 zorn01 = proj1 zorn03 | |
847 zorn02 : {x : HOD} → A ∋ x → ¬ (ODC.minimal O HasMaximal (λ eq → not (=od∅→≡o∅ eq)) < x) | |
848 zorn02 {x} ax m<x = proj2 zorn03 (& x) ax (subst₂ (λ j k → j < k) (sym *iso) (sym *iso) m<x ) | |
703 | 849 ... | yes ¬Maximal = ⊥-elim ( z04 nmx zorn04 total ) where |
551 | 850 -- if we have no maximal, make ZChain, which contradict SUP condition |
851 nmx : ¬ Maximal A | |
852 nmx mx = ∅< {HasMaximal} zc5 ( ≡o∅→=od∅ ¬Maximal ) where | |
853 zc5 : odef A (& (Maximal.maximal mx)) ∧ (( y : Ordinal ) → odef A y → ¬ (* (& (Maximal.maximal mx)) < * y)) | |
854 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 | 855 zorn04 : ZChain A (cf nmx) (cf-is-≤-monotonic nmx) as0 (& A) |
653 | 856 zorn04 = SZ (cf nmx) (cf-is-≤-monotonic nmx) (subst (λ k → odef A k ) &iso as ) |
634 | 857 total : IsTotalOrderSet (ZChain.chain zorn04) |
654 | 858 total {a} {b} = zorn06 where |
859 zorn06 : odef (ZChain.chain zorn04) (& a) → odef (ZChain.chain zorn04) (& b) → Tri (a < b) (a ≡ b) (b < a) | |
860 zorn06 = ZChain.f-total (SZ (cf nmx) (cf-is-≤-monotonic nmx) (subst (λ k → odef A k ) &iso as) ) | |
551 | 861 |
516 | 862 -- usage (see filter.agda ) |
863 -- | |
497 | 864 -- _⊆'_ : ( A B : HOD ) → Set n |
865 -- _⊆'_ A B = (x : Ordinal ) → odef A x → odef B x | |
482 | 866 |
497 | 867 -- MaximumSubset : {L P : HOD} |
868 -- → o∅ o< & L → o∅ o< & P → P ⊆ L | |
869 -- → IsPartialOrderSet P _⊆'_ | |
870 -- → ( (B : HOD) → B ⊆ P → IsTotalOrderSet B _⊆'_ → SUP P B _⊆'_ ) | |
871 -- → Maximal P (_⊆'_) | |
872 -- MaximumSubset {L} {P} 0<L 0<P P⊆L PO SP = Zorn-lemma {P} {_⊆'_} 0<P PO SP |