Mercurial > hg > Members > kono > Proof > ZF-in-agda
annotate BAlgbra.agda @ 355:45fefbfd4871
Added tag current for changeset aa03b9c289c0
author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Tue, 14 Jul 2020 11:17:34 +0900 |
parents | 12071f79f3cf |
children | 2a8a51375e49 |
rev | line source |
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1 open import Level |
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2 open import Ordinals |
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3 module BAlgbra {n : Level } (O : Ordinals {n}) where |
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4 |
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5 open import zf |
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6 open import logic |
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7 import OD |
276 | 8 import ODC |
272
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9 |
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10 open import Relation.Nullary |
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11 open import Relation.Binary |
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12 open import Data.Empty |
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13 open import Relation.Binary |
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14 open import Relation.Binary.Core |
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15 open import Relation.Binary.PropositionalEquality |
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16 open import Data.Nat renaming ( zero to Zero ; suc to Suc ; ℕ to Nat ; _⊔_ to _n⊔_ ) |
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17 |
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18 open inOrdinal O |
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19 open OD O |
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20 open OD.OD |
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21 open ODAxiom odAxiom |
331 | 22 open HOD |
272
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23 |
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24 open _∧_ |
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25 open _∨_ |
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26 open Bool |
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27 |
329 | 28 _∩_ : ( A B : HOD ) → HOD |
331 | 29 A ∩ B = record { od = record { def = λ x → odef A x ∧ odef B x } ; |
30 odmax = omin (odmax A) (odmax B) ; <odmax = λ y → min1 (<odmax A (proj1 y)) (<odmax B (proj2 y)) } | |
272
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31 |
329 | 32 _∪_ : ( A B : HOD ) → HOD |
331 | 33 A ∪ B = record { od = record { def = λ x → odef A x ∨ odef B x } ; |
34 odmax = omax (odmax A) (odmax B) ; <odmax = lemma } where | |
35 lemma : {y : Ordinal} → odef A y ∨ odef B y → y o< omax (odmax A) (odmax B) | |
36 lemma {y} (case1 a) = ordtrans (<odmax A a) (omax-x _ _) | |
37 lemma {y} (case2 b) = ordtrans (<odmax B b) (omax-y _ _) | |
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38 |
329 | 39 _\_ : ( A B : HOD ) → HOD |
331 | 40 A \ B = record { od = record { def = λ x → odef A x ∧ ( ¬ ( odef B x ) ) }; odmax = odmax A ; <odmax = λ y → <odmax A (proj1 y) } |
272
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41 |
329 | 42 ∪-Union : { A B : HOD } → Union (A , B) ≡ ( A ∪ B ) |
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43 ∪-Union {A} {B} = ==→o≡ ( record { eq→ = lemma1 ; eq← = lemma2 } ) where |
331 | 44 lemma1 : {x : Ordinal} → odef (Union (A , B)) x → odef (A ∪ B) x |
272
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45 lemma1 {x} lt = lemma3 lt where |
331 | 46 lemma4 : {y : Ordinal} → odef (A , B) y ∧ odef (ord→od y) x → ¬ (¬ ( odef A x ∨ odef B x) ) |
272
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47 lemma4 {y} z with proj1 z |
331 | 48 lemma4 {y} z | case1 refl = double-neg (case1 ( subst (λ k → odef k x ) oiso (proj2 z)) ) |
49 lemma4 {y} z | case2 refl = double-neg (case2 ( subst (λ k → odef k x ) oiso (proj2 z)) ) | |
50 lemma3 : (((u : Ordinals.ord O) → ¬ odef (A , B) u ∧ odef (ord→od u) x) → ⊥) → odef (A ∪ B) x | |
276 | 51 lemma3 not = ODC.double-neg-eilm O (FExists _ lemma4 not) -- choice |
331 | 52 lemma2 : {x : Ordinal} → odef (A ∪ B) x → odef (Union (A , B)) x |
53 lemma2 {x} (case1 A∋x) = subst (λ k → odef (Union (A , B)) k) diso ( IsZF.union→ isZF (A , B) (ord→od x) A | |
54 (record { proj1 = case1 refl ; proj2 = subst (λ k → odef A k) (sym diso) A∋x})) | |
55 lemma2 {x} (case2 B∋x) = subst (λ k → odef (Union (A , B)) k) diso ( IsZF.union→ isZF (A , B) (ord→od x) B | |
56 (record { proj1 = case2 refl ; proj2 = subst (λ k → odef B k) (sym diso) B∋x})) | |
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57 |
329 | 58 ∩-Select : { A B : HOD } → Select A ( λ x → ( A ∋ x ) ∧ ( B ∋ x ) ) ≡ ( A ∩ B ) |
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59 ∩-Select {A} {B} = ==→o≡ ( record { eq→ = lemma1 ; eq← = lemma2 } ) where |
331 | 60 lemma1 : {x : Ordinal} → odef (Select A (λ x₁ → (A ∋ x₁) ∧ (B ∋ x₁))) x → odef (A ∩ B) x |
61 lemma1 {x} lt = record { proj1 = proj1 lt ; proj2 = subst (λ k → odef B k ) diso (proj2 (proj2 lt)) } | |
62 lemma2 : {x : Ordinal} → odef (A ∩ B) x → odef (Select A (λ x₁ → (A ∋ x₁) ∧ (B ∋ x₁))) x | |
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63 lemma2 {x} lt = record { proj1 = proj1 lt ; proj2 = |
331 | 64 record { proj1 = subst (λ k → odef A k) (sym diso) (proj1 lt) ; proj2 = subst (λ k → odef B k ) (sym diso) (proj2 lt) } } |
272
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65 |
329 | 66 dist-ord : {p q r : HOD } → p ∩ ( q ∪ r ) ≡ ( p ∩ q ) ∪ ( p ∩ r ) |
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67 dist-ord {p} {q} {r} = ==→o≡ ( record { eq→ = lemma1 ; eq← = lemma2 } ) where |
331 | 68 lemma1 : {x : Ordinal} → odef (p ∩ (q ∪ r)) x → odef ((p ∩ q) ∪ (p ∩ r)) x |
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69 lemma1 {x} lt with proj2 lt |
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70 lemma1 {x} lt | case1 q∋x = case1 ( record { proj1 = proj1 lt ; proj2 = q∋x } ) |
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71 lemma1 {x} lt | case2 r∋x = case2 ( record { proj1 = proj1 lt ; proj2 = r∋x } ) |
331 | 72 lemma2 : {x : Ordinal} → odef ((p ∩ q) ∪ (p ∩ r)) x → odef (p ∩ (q ∪ r)) x |
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73 lemma2 {x} (case1 p∩q) = record { proj1 = proj1 p∩q ; proj2 = case1 (proj2 p∩q ) } |
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74 lemma2 {x} (case2 p∩r) = record { proj1 = proj1 p∩r ; proj2 = case2 (proj2 p∩r ) } |
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75 |
329 | 76 dist-ord2 : {p q r : HOD } → p ∪ ( q ∩ r ) ≡ ( p ∪ q ) ∩ ( p ∪ r ) |
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77 dist-ord2 {p} {q} {r} = ==→o≡ ( record { eq→ = lemma1 ; eq← = lemma2 } ) where |
331 | 78 lemma1 : {x : Ordinal} → odef (p ∪ (q ∩ r)) x → odef ((p ∪ q) ∩ (p ∪ r)) x |
272
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79 lemma1 {x} (case1 cp) = record { proj1 = case1 cp ; proj2 = case1 cp } |
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80 lemma1 {x} (case2 cqr) = record { proj1 = case2 (proj1 cqr) ; proj2 = case2 (proj2 cqr) } |
331 | 81 lemma2 : {x : Ordinal} → odef ((p ∪ q) ∩ (p ∪ r)) x → odef (p ∪ (q ∩ r)) x |
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82 lemma2 {x} lt with proj1 lt | proj2 lt |
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83 lemma2 {x} lt | case1 cp | _ = case1 cp |
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84 lemma2 {x} lt | _ | case1 cp = case1 cp |
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85 lemma2 {x} lt | case2 cq | case2 cr = case2 ( record { proj1 = cq ; proj2 = cr } ) |
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86 |
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87 record IsBooleanAlgebra ( L : Set n) |
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88 ( b1 : L ) |
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89 ( b0 : L ) |
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90 ( -_ : L → L ) |
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91 ( _+_ : L → L → L ) |
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92 ( _*_ : L → L → L ) : Set (suc n) where |
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93 field |
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94 +-assoc : {a b c : L } → a + ( b + c ) ≡ (a + b) + c |
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95 *-assoc : {a b c : L } → a * ( b * c ) ≡ (a * b) * c |
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96 +-sym : {a b : L } → a + b ≡ b + a |
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97 -sym : {a b : L } → a * b ≡ b * a |
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98 -aab : {a b : L } → a + ( a * b ) ≡ a |
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99 *-aab : {a b : L } → a * ( a + b ) ≡ a |
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100 -dist : {a b c : L } → a + ( b * c ) ≡ ( a * b ) + ( a * c ) |
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101 *-dist : {a b c : L } → a * ( b + c ) ≡ ( a + b ) * ( a + c ) |
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102 a+0 : {a : L } → a + b0 ≡ a |
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103 a*1 : {a : L } → a * b1 ≡ a |
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104 a+-a1 : {a : L } → a + ( - a ) ≡ b1 |
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105 a*-a0 : {a : L } → a * ( - a ) ≡ b0 |
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106 |
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107 record BooleanAlgebra ( L : Set n) : Set (suc n) where |
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108 field |
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109 b1 : L |
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110 b0 : L |
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111 -_ : L → L |
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112 _++_ : L → L → L |
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113 _**_ : L → L → L |
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114 isBooleanAlgebra : IsBooleanAlgebra L b1 b0 -_ _++_ _**_ |
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115 |