Mercurial > hg > Members > kono > Proof > ZF-in-agda
annotate Ordinals.agda @ 221:1709c80b7275
fix Ordinals
| author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Thu, 08 Aug 2019 17:32:21 +0900 |
| parents | 95a26d1698f4 |
| children | 59771eb07df0 |
| rev | line source |
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| 16 | 1 open import Level |
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2 module Ordinals where |
| 3 | 3 |
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4 open import zf |
| 3 | 5 |
| 23 | 6 open import Data.Nat renaming ( zero to Zero ; suc to Suc ; ℕ to Nat ; _⊔_ to _n⊔_ ) |
| 75 | 7 open import Data.Empty |
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8 open import Relation.Binary.PropositionalEquality |
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separate logic and nat
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9 open import logic |
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10 open import nat |
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11 open import Data.Unit using ( ⊤ ) |
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12 open import Relation.Nullary |
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13 open import Relation.Binary |
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14 open import Relation.Binary.Core |
| 3 | 15 |
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16 |
| 3 | 17 |
| 221 | 18 record IsOrdinals {n : Level} (ord : Set n) (o∅ : ord ) (osuc : ord → ord ) (_o<_ : ord → ord → Set n) : Set n where |
| 16 | 19 field |
| 221 | 20 Otrans : {x y z : ord } → x o< y → y o< z → x o< z |
| 21 OTri : Trichotomous {n} _≡_ _o<_ | |
| 22 ¬x<0 : { x : ord } → ¬ ( x o< o∅ ) | |
| 23 <-osuc : { x : ord } → x o< osuc x | |
| 24 osuc-≡< : { a x : ord } → x o< osuc a → (x ≡ a ) ∨ (x o< a) | |
| 16 | 25 |
| 221 | 26 record Ordinals {n : Level} : Set (suc n) where |
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27 field |
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28 ord : Set n |
| 221 | 29 o∅ : ord |
| 30 osuc : ord → ord | |
| 31 _o<_ : ord → ord → Set n | |
| 32 isOrdinal : IsOrdinals ord o∅ osuc _o<_ | |
| 17 | 33 |
| 221 | 34 module inOrdinal {n : Level} (O : Ordinals {n} ) where |
| 3 | 35 |
| 221 | 36 Ordinal : Set n |
| 37 Ordinal = Ordinals.ord O | |
| 38 | |
| 39 _o<_ : Ordinal → Ordinal → Set n | |
| 40 _o<_ = Ordinals._o<_ O | |
| 218 | 41 |
| 221 | 42 osuc : Ordinal → Ordinal |
| 43 osuc = Ordinals.osuc O | |
| 218 | 44 |
| 221 | 45 o∅ : Ordinal |
| 46 o∅ = Ordinals.o∅ O | |
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47 |
| 221 | 48 ¬x<0 = IsOrdinals.¬x<0 (Ordinals.isOrdinal O) |
| 49 osuc-≡< = IsOrdinals.osuc-≡< (Ordinals.isOrdinal O) | |
| 50 <-osuc = IsOrdinals.<-osuc (Ordinals.isOrdinal O) | |
| 51 | |
| 52 o<-dom : { x y : Ordinal } → x o< y → Ordinal | |
| 53 o<-dom {x} _ = x | |
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54 |
| 221 | 55 o<-cod : { x y : Ordinal } → x o< y → Ordinal |
| 56 o<-cod {_} {y} _ = y | |
| 147 | 57 |
| 221 | 58 o<-subst : {Z X z x : Ordinal } → Z o< X → Z ≡ z → X ≡ x → z o< x |
| 59 o<-subst df refl refl = df | |
| 94 | 60 |
| 221 | 61 ordtrans : {x y z : Ordinal } → x o< y → y o< z → x o< z |
| 62 ordtrans = IsOrdinals.Otrans (Ordinals.isOrdinal O) | |
| 94 | 63 |
| 221 | 64 trio< : Trichotomous _≡_ _o<_ |
| 65 trio< = IsOrdinals.OTri (Ordinals.isOrdinal O) | |
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66 |
| 221 | 67 o<¬≡ : { ox oy : Ordinal } → ox ≡ oy → ox o< oy → ⊥ |
| 68 o<¬≡ {ox} {oy} eq lt with trio< ox oy | |
| 69 o<¬≡ {ox} {oy} eq lt | tri< a ¬b ¬c = ¬b eq | |
| 70 o<¬≡ {ox} {oy} eq lt | tri≈ ¬a b ¬c = ¬a lt | |
| 71 o<¬≡ {ox} {oy} eq lt | tri> ¬a ¬b c = ¬b eq | |
| 23 | 72 |
| 221 | 73 o<> : {x y : Ordinal } → y o< x → x o< y → ⊥ |
| 74 o<> {ox} {oy} lt tl with trio< ox oy | |
| 75 o<> {ox} {oy} lt tl | tri< a ¬b ¬c = ¬c lt | |
| 76 o<> {ox} {oy} lt tl | tri≈ ¬a b ¬c = ¬a tl | |
| 77 o<> {ox} {oy} lt tl | tri> ¬a ¬b c = ¬a tl | |
| 23 | 78 |
| 221 | 79 osuc-< : { x y : Ordinal } → y o< osuc x → x o< y → ⊥ |
| 80 osuc-< {x} {y} y<ox x<y with osuc-≡< y<ox | |
| 81 osuc-< {x} {y} y<ox x<y | case1 refl = o<¬≡ refl x<y | |
| 82 osuc-< {x} {y} y<ox x<y | case2 y<x = o<> x<y y<x | |
| 180 | 83 |
| 221 | 84 osucc : {ox oy : Ordinal } → oy o< ox → osuc oy o< osuc ox |
| 85 ---- y < osuc y < x < osuc x | |
| 86 ---- y < osuc y = x < osuc x | |
| 87 ---- y < osuc y > x < osuc x -> y = x ∨ x < y → ⊥ | |
| 88 osucc {ox} {oy} oy<ox with trio< (osuc oy) ox | |
| 89 osucc {ox} {oy} oy<ox | tri< a ¬b ¬c = ordtrans a <-osuc | |
| 90 osucc {ox} {oy} oy<ox | tri≈ ¬a refl ¬c = <-osuc | |
| 91 osucc {ox} {oy} oy<ox | tri> ¬a ¬b c with osuc-≡< c | |
| 92 osucc {ox} {oy} oy<ox | tri> ¬a ¬b c | case1 eq = ⊥-elim (o<¬≡ (sym eq) oy<ox) | |
| 93 osucc {ox} {oy} oy<ox | tri> ¬a ¬b c | case2 lt = ⊥-elim (o<> lt oy<ox) | |
| 94 | |
| 95 open _∧_ | |
| 84 | 96 |
| 221 | 97 osuc2 : ( x y : Ordinal ) → ( osuc x o< osuc (osuc y )) ⇔ (x o< osuc y) |
| 98 proj2 (osuc2 x y) lt = osucc lt | |
| 99 proj1 (osuc2 x y) ox<ooy with osuc-≡< ox<ooy | |
| 100 proj1 (osuc2 x y) ox<ooy | case1 ox=oy = o<-subst <-osuc refl ox=oy | |
| 101 proj1 (osuc2 x y) ox<ooy | case2 ox<oy = ordtrans <-osuc ox<oy | |
| 129 | 102 |
| 221 | 103 _o≤_ : Ordinal → Ordinal → Set n |
| 104 a o≤ b = (a ≡ b) ∨ ( a o< b ) | |
| 105 | |
| 129 | 106 |
| 221 | 107 xo<ab : {oa ob : Ordinal } → ( {ox : Ordinal } → ox o< oa → ox o< ob ) → oa o< osuc ob |
| 108 xo<ab {oa} {ob} a→b with trio< oa ob | |
| 109 xo<ab {oa} {ob} a→b | tri< a ¬b ¬c = ordtrans a <-osuc | |
| 110 xo<ab {oa} {ob} a→b | tri≈ ¬a refl ¬c = <-osuc | |
| 111 xo<ab {oa} {ob} a→b | tri> ¬a ¬b c = ⊥-elim ( o<¬≡ refl (a→b c ) ) | |
| 88 | 112 |
| 221 | 113 maxα : Ordinal → Ordinal → Ordinal |
| 114 maxα x y with trio< x y | |
| 115 maxα x y | tri< a ¬b ¬c = y | |
| 116 maxα x y | tri> ¬a ¬b c = x | |
| 117 maxα x y | tri≈ ¬a refl ¬c = x | |
| 84 | 118 |
| 221 | 119 minα : Ordinal → Ordinal → Ordinal |
| 120 minα x y with trio< x y | |
| 121 minα x y | tri< a ¬b ¬c = x | |
| 122 minα x y | tri> ¬a ¬b c = y | |
| 123 minα x y | tri≈ ¬a refl ¬c = x | |
| 88 | 124 |
| 221 | 125 min1 : {x y z : Ordinal } → z o< x → z o< y → z o< minα x y |
| 126 min1 {x} {y} {z} z<x z<y with trio< x y | |
| 127 min1 {x} {y} {z} z<x z<y | tri< a ¬b ¬c = z<x | |
| 128 min1 {x} {y} {z} z<x z<y | tri≈ ¬a refl ¬c = z<x | |
| 129 min1 {x} {y} {z} z<x z<y | tri> ¬a ¬b c = z<y | |
| 84 | 130 |
| 221 | 131 -- |
| 132 -- max ( osuc x , osuc y ) | |
| 133 -- | |
| 134 | |
| 135 omax : ( x y : Ordinal ) → Ordinal | |
| 136 omax x y with trio< x y | |
| 137 omax x y | tri< a ¬b ¬c = osuc y | |
| 138 omax x y | tri> ¬a ¬b c = osuc x | |
| 139 omax x y | tri≈ ¬a refl ¬c = osuc x | |
| 86 | 140 |
| 221 | 141 omax< : ( x y : Ordinal ) → x o< y → osuc y ≡ omax x y |
| 142 omax< x y lt with trio< x y | |
| 143 omax< x y lt | tri< a ¬b ¬c = refl | |
| 144 omax< x y lt | tri≈ ¬a b ¬c = ⊥-elim (¬a lt ) | |
| 145 omax< x y lt | tri> ¬a ¬b c = ⊥-elim (¬a lt ) | |
| 86 | 146 |
| 221 | 147 omax≡ : ( x y : Ordinal ) → x ≡ y → osuc y ≡ omax x y |
| 148 omax≡ x y eq with trio< x y | |
| 149 omax≡ x y eq | tri< a ¬b ¬c = ⊥-elim (¬b eq ) | |
| 150 omax≡ x y eq | tri≈ ¬a refl ¬c = refl | |
| 151 omax≡ x y eq | tri> ¬a ¬b c = ⊥-elim (¬b eq ) | |
| 91 | 152 |
| 221 | 153 omax-x : ( x y : Ordinal ) → x o< omax x y |
| 154 omax-x x y with trio< x y | |
| 155 omax-x x y | tri< a ¬b ¬c = ordtrans a <-osuc | |
| 156 omax-x x y | tri> ¬a ¬b c = <-osuc | |
| 157 omax-x x y | tri≈ ¬a refl ¬c = <-osuc | |
| 16 | 158 |
| 221 | 159 omax-y : ( x y : Ordinal ) → y o< omax x y |
| 160 omax-y x y with trio< x y | |
| 161 omax-y x y | tri< a ¬b ¬c = <-osuc | |
| 162 omax-y x y | tri> ¬a ¬b c = ordtrans c <-osuc | |
| 163 omax-y x y | tri≈ ¬a refl ¬c = <-osuc | |
| 164 | |
| 165 omxx : ( x : Ordinal ) → omax x x ≡ osuc x | |
| 166 omxx x with trio< x x | |
| 167 omxx x | tri< a ¬b ¬c = ⊥-elim (¬b refl ) | |
| 168 omxx x | tri> ¬a ¬b c = ⊥-elim (¬b refl ) | |
| 169 omxx x | tri≈ ¬a refl ¬c = refl | |
| 170 | |
| 171 omxxx : ( x : Ordinal ) → omax x (omax x x ) ≡ osuc (osuc x) | |
| 172 omxxx x = trans ( cong ( λ k → omax x k ) (omxx x )) (sym ( omax< x (osuc x) <-osuc )) | |
| 173 | |
| 174 open _∧_ | |
| 16 | 175 |
| 221 | 176 OrdTrans : Transitive _o≤_ |
| 177 OrdTrans (case1 refl) (case1 refl) = case1 refl | |
| 178 OrdTrans (case1 refl) (case2 lt2) = case2 lt2 | |
| 179 OrdTrans (case2 lt1) (case1 refl) = case2 lt1 | |
| 180 OrdTrans (case2 x) (case2 y) = case2 (ordtrans x y) | |
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181 |
| 221 | 182 OrdPreorder : Preorder n n n |
| 183 OrdPreorder = record { Carrier = Ordinal | |
| 184 ; _≈_ = _≡_ | |
| 185 ; _∼_ = _o≤_ | |
| 186 ; isPreorder = record { | |
| 187 isEquivalence = record { refl = refl ; sym = sym ; trans = trans } | |
| 188 ; reflexive = case1 | |
| 189 ; trans = OrdTrans | |
| 190 } | |
| 191 } | |
| 165 | 192 |
| 221 | 193 TransFiniteExists : {m l : Level} → ( ψ : Ordinal → Set m ) |
| 194 → {p : Set l} ( P : { y : Ordinal } → ψ y → ¬ p ) | |
| 195 → (exists : ¬ (∀ y → ¬ ( ψ y ) )) | |
| 196 → ¬ p | |
| 197 TransFiniteExists {m} {l} ψ {p} P = contra-position ( λ p y ψy → P {y} ψy p ) | |
| 198 |