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disjunction and conjunction
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Sun, 06 Oct 2019 16:42:42 +0900
parents 7b4a66710cdd
children fc3d4bc1dc5e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
190
6e778b0a7202 add filter
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents:
diff changeset
1 open import Level
236
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 193
diff changeset
2 open import Ordinals
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 193
diff changeset
3 module filter {n : Level } (O : Ordinals {n}) where
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 193
diff changeset
4
190
6e778b0a7202 add filter
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents:
diff changeset
5 open import zf
236
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 193
diff changeset
6 open import logic
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 193
diff changeset
7 import OD
193
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 191
diff changeset
8
190
6e778b0a7202 add filter
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents:
diff changeset
9 open import Relation.Nullary
6e778b0a7202 add filter
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents:
diff changeset
10 open import Relation.Binary
6e778b0a7202 add filter
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents:
diff changeset
11 open import Data.Empty
6e778b0a7202 add filter
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents:
diff changeset
12 open import Relation.Binary
6e778b0a7202 add filter
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents:
diff changeset
13 open import Relation.Binary.Core
6e778b0a7202 add filter
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents:
diff changeset
14 open import Relation.Binary.PropositionalEquality
191
9eb6a8691f02 choice function cannot jump between ordinal level
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 190
diff changeset
15 open import Data.Nat renaming ( zero to Zero ; suc to Suc ; ℕ to Nat ; _⊔_ to _n⊔_ )
9eb6a8691f02 choice function cannot jump between ordinal level
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 190
diff changeset
16
236
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 193
diff changeset
17 open inOrdinal O
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 193
diff changeset
18 open OD O
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 193
diff changeset
19 open OD.OD
190
6e778b0a7202 add filter
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents:
diff changeset
20
236
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 193
diff changeset
21 open _∧_
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 193
diff changeset
22 open _∨_
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 193
diff changeset
23 open Bool
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 193
diff changeset
24
267
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 266
diff changeset
25 _∩_ : ( A B : OD ) → OD
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 266
diff changeset
26 A ∩ B = record { def = λ x → def A x ∧ def B x }
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 266
diff changeset
27
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 266
diff changeset
28 _∪_ : ( A B : OD ) → OD
269
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
29 A ∪ B = record { def = λ x → def A x ∨ def B x }
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
30
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
31 ∪-Union : { A B : OD } → Union (A , B) ≡ ( A ∪ B )
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
32 ∪-Union {A} {B} = ==→o≡ ( record { eq→ = lemma1 ; eq← = lemma2 } ) where
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
33 lemma1 : {x : Ordinal} → def (Union (A , B)) x → def (A ∪ B) x
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
34 lemma1 {x} lt = lemma3 lt where
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
35 lemma4 : {y : Ordinal} → def (A , B) y ∧ def (ord→od y) x → ¬ (¬ ( def A x ∨ def B x) )
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
36 lemma4 {y} z with proj1 z
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
37 lemma4 {y} z | case1 refl = double-neg (case1 ( subst (λ k → def k x ) oiso (proj2 z)) )
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
38 lemma4 {y} z | case2 refl = double-neg (case2 ( subst (λ k → def k x ) oiso (proj2 z)) )
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
39 lemma3 : (((u : Ordinals.ord O) → ¬ def (A , B) u ∧ def (ord→od u) x) → ⊥) → def (A ∪ B) x
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
40 lemma3 not = double-neg-eilm (FExists _ lemma4 not)
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
41 lemma2 : {x : Ordinal} → def (A ∪ B) x → def (Union (A , B)) x
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
42 lemma2 {x} (case1 A∋x) = subst (λ k → def (Union (A , B)) k) diso ( IsZF.union→ isZF (A , B) (ord→od x) A
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
43 (record { proj1 = case1 refl ; proj2 = subst (λ k → def A k) (sym diso) A∋x}))
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
44 lemma2 {x} (case2 B∋x) = subst (λ k → def (Union (A , B)) k) diso ( IsZF.union→ isZF (A , B) (ord→od x) B
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
45 (record { proj1 = case2 refl ; proj2 = subst (λ k → def B k) (sym diso) B∋x}))
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
46
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
47 ∩-Select : { A B : OD } → Select A ( λ x → ( A ∋ x ) ∧ ( B ∋ x ) ) ≡ ( A ∩ B )
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
48 ∩-Select {A} {B} = ==→o≡ ( record { eq→ = lemma1 ; eq← = lemma2 } ) where
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
49 lemma1 : {x : Ordinal} → def (Select A (λ x₁ → (A ∋ x₁) ∧ (B ∋ x₁))) x → def (A ∩ B) x
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
50 lemma1 {x} lt = record { proj1 = proj1 lt ; proj2 = subst (λ k → def B k ) diso (proj2 (proj2 lt)) }
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
51 lemma2 : {x : Ordinal} → def (A ∩ B) x → def (Select A (λ x₁ → (A ∋ x₁) ∧ (B ∋ x₁))) x
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
52 lemma2 {x} lt = record { proj1 = proj1 lt ; proj2 =
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
53 record { proj1 = subst (λ k → def A k) (sym diso) (proj1 lt) ; proj2 = subst (λ k → def B k ) (sym diso) (proj2 lt) } }
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
54
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
55 dist-ord : {p q r : OD } → p ∩ ( q ∪ r ) ≡ ( p ∩ q ) ∪ ( p ∩ r )
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
56 dist-ord {p} {q} {r} = ==→o≡ ( record { eq→ = lemma1 ; eq← = lemma2 } ) where
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
57 lemma1 : {x : Ordinal} → def (p ∩ (q ∪ r)) x → def ((p ∩ q) ∪ (p ∩ r)) x
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
58 lemma1 {x} lt with proj2 lt
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
59 lemma1 {x} lt | case1 q∋x = case1 ( record { proj1 = proj1 lt ; proj2 = q∋x } )
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
60 lemma1 {x} lt | case2 r∋x = case2 ( record { proj1 = proj1 lt ; proj2 = r∋x } )
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
61 lemma2 : {x : Ordinal} → def ((p ∩ q) ∪ (p ∩ r)) x → def (p ∩ (q ∪ r)) x
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
62 lemma2 {x} (case1 p∩q) = record { proj1 = proj1 p∩q ; proj2 = case1 (proj2 p∩q ) }
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
63 lemma2 {x} (case2 p∩r) = record { proj1 = proj1 p∩r ; proj2 = case2 (proj2 p∩r ) }
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
64
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
65 dist-ord2 : {p q r : OD } → p ∪ ( q ∩ r ) ≡ ( p ∪ q ) ∩ ( p ∪ r )
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
66 dist-ord2 {p} {q} {r} = ==→o≡ ( record { eq→ = lemma1 ; eq← = lemma2 } ) where
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
67 lemma1 : {x : Ordinal} → def (p ∪ (q ∩ r)) x → def ((p ∪ q) ∩ (p ∪ r)) x
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
68 lemma1 {x} (case1 cp) = record { proj1 = case1 cp ; proj2 = case1 cp }
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
69 lemma1 {x} (case2 cqr) = record { proj1 = case2 (proj1 cqr) ; proj2 = case2 (proj2 cqr) }
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
70 lemma2 : {x : Ordinal} → def ((p ∪ q) ∩ (p ∪ r)) x → def (p ∪ (q ∩ r)) x
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
71 lemma2 {x} lt with proj1 lt | proj2 lt
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
72 lemma2 {x} lt | case1 cp | _ = case1 cp
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
73 lemma2 {x} lt | _ | case1 cp = case1 cp
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
74 lemma2 {x} lt | case2 cq | case2 cr = case2 ( record { proj1 = cq ; proj2 = cr } )
267
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 266
diff changeset
75
265
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 236
diff changeset
76 record Filter ( L : OD ) : Set (suc n) where
191
9eb6a8691f02 choice function cannot jump between ordinal level
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 190
diff changeset
77 field
269
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
78 F1 : { p q : OD } → L ∋ p → ({ x : OD} → _⊆_ p q {x} ) → L ∋ q
267
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 266
diff changeset
79 F2 : { p q : OD } → L ∋ p → L ∋ q → L ∋ (p ∩ q)
191
9eb6a8691f02 choice function cannot jump between ordinal level
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 190
diff changeset
80
265
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 236
diff changeset
81 open Filter
191
9eb6a8691f02 choice function cannot jump between ordinal level
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 190
diff changeset
82
265
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 236
diff changeset
83 proper-filter : {L : OD} → Filter L → Set n
267
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 266
diff changeset
84 proper-filter {L} P = ¬ ( L ∋ od∅ )
190
6e778b0a7202 add filter
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents:
diff changeset
85
267
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 266
diff changeset
86 prime-filter : {L : OD} → Filter L → {p q : OD } → Set n
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 266
diff changeset
87 prime-filter {L} P {p} {q} = L ∋ ( p ∪ q) → ( L ∋ p ) ∨ ( L ∋ q )
190
6e778b0a7202 add filter
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents:
diff changeset
88
267
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 266
diff changeset
89 ultra-filter : {L : OD} → Filter L → {p : OD } → Set n
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 266
diff changeset
90 ultra-filter {L} P {p} = ( L ∋ p ) ∨ ( ¬ ( L ∋ p ))
190
6e778b0a7202 add filter
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents:
diff changeset
91
265
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 236
diff changeset
92
267
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 266
diff changeset
93 filter-lemma1 : {L : OD} → (P : Filter L) → {p q : OD } → ( (p : OD ) → ultra-filter {L} P {p} ) → prime-filter {L} P {p} {q}
266
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 265
diff changeset
94 filter-lemma1 {L} P {p} {q} u lt with u p | u q
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 265
diff changeset
95 filter-lemma1 {L} P {p} {q} u lt | case1 x | case1 y = case1 x
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 265
diff changeset
96 filter-lemma1 {L} P {p} {q} u lt | case1 x | case2 y = case1 x
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 265
diff changeset
97 filter-lemma1 {L} P {p} {q} u lt | case2 x | case1 y = case2 y
268
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 267
diff changeset
98 filter-lemma1 {L} P {p} {q} u lt | case2 x | case2 y = ⊥-elim (lemma (record { proj1 = x ; proj2 = y })) where
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 267
diff changeset
99 lemma : ¬ ( ¬ ( L ∋ p ) ) ∧ ( ¬ ( L ∋ q ))
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 267
diff changeset
100 lemma = {!!}
266
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 265
diff changeset
101
267
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 266
diff changeset
102 generated-filter : {L : OD} → Filter L → (p : OD ) → Filter ( record { def = λ x → def L x ∨ (x ≡ od→ord p) } )
266
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 265
diff changeset
103 generated-filter {L} P p = record {
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 265
diff changeset
104 F1 = {!!} ; F2 = {!!}
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 265
diff changeset
105 }
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 265
diff changeset
106
269
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
107 record Dense (P : OD ) : Set (suc n) where
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
108 field
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
109 dense : OD
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
110 incl : { x : OD} → _⊆_ dense P {x}
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
111 dense-f : OD → OD
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
112 dense-p : { p x : OD} → P ∋ p → _⊆_ p (dense-f p) {x}
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
113
266
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 265
diff changeset
114 -- H(ω,2) = Power ( Power ω ) = Def ( Def ω))
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 265
diff changeset
115
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 265
diff changeset
116 infinite = ZF.infinite OD→ZF
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 265
diff changeset
117
269
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
118 module in-countable-ordinal {n : Level} where
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
119
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
120 import ordinal
266
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 265
diff changeset
121
269
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
122 open ordinal.C-Ordinal-with-choice
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
123
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
124 Hω2 : Filter (Power (Power infinite))
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
125 Hω2 = record { F1 = {!!} ; F2 = {!!} }
30e419a2be24 disjunction and conjunction
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
parents: 268
diff changeset
126