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1 {-# OPTIONS --cubical-compatible --safe #-}
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2
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3 module logic where
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4
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5 open import Level
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6 open import Relation.Nullary
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7 open import Relation.Binary hiding (_⇔_ )
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8 open import Data.Empty
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9
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10
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11 data Bool : Set where
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12 true : Bool
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13 false : Bool
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14
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15 record _∧_ {n m : Level} (A : Set n) ( B : Set m ) : Set (n ⊔ m) where
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16 constructor ⟪_,_⟫
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17 field
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18 proj1 : A
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19 proj2 : B
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20
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21 data _∨_ {n m : Level} (A : Set n) ( B : Set m ) : Set (n ⊔ m) where
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22 case1 : A → A ∨ B
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23 case2 : B → A ∨ B
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24
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25 _⇔_ : {n m : Level } → ( A : Set n ) ( B : Set m ) → Set (n ⊔ m)
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26 _⇔_ A B = ( A → B ) ∧ ( B → A )
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27
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28 contra-position : {n m : Level } {A : Set n} {B : Set m} → (A → B) → ¬ B → ¬ A
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29 contra-position {n} {m} {A} {B} f ¬b a = ¬b ( f a )
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30
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31 double-neg : {n : Level } {A : Set n} → A → ¬ ¬ A
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32 double-neg A notnot = notnot A
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33
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34 double-neg2 : {n : Level } {A : Set n} → ¬ ¬ ¬ A → ¬ A
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35 double-neg2 notnot A = notnot ( double-neg A )
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36
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37 de-morgan : {n : Level } {A B : Set n} → A ∧ B → ¬ ( (¬ A ) ∨ (¬ B ) )
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38 de-morgan {n} {A} {B} and (case1 ¬A) = ⊥-elim ( ¬A ( _∧_.proj1 and ))
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39 de-morgan {n} {A} {B} and (case2 ¬B) = ⊥-elim ( ¬B ( _∧_.proj2 and ))
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40
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41 dont-or : {n m : Level} {A : Set n} { B : Set m } → A ∨ B → ¬ A → B
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42 dont-or {A} {B} (case1 a) ¬A = ⊥-elim ( ¬A a )
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43 dont-or {A} {B} (case2 b) ¬A = b
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44
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45 dont-orb : {n m : Level} {A : Set n} { B : Set m } → A ∨ B → ¬ B → A
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46 dont-orb {A} {B} (case2 b) ¬B = ⊥-elim ( ¬B b )
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47 dont-orb {A} {B} (case1 a) ¬B = a
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48
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49 infixr 130 _∧_
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50 infixr 140 _∨_
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51 infixr 150 _⇔_
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52
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53 _/\_ : Bool → Bool → Bool
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54 true /\ true = true
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55 _ /\ _ = false
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56
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57 _\/_ : Bool → Bool → Bool
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58 false \/ false = false
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59 _ \/ _ = true
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60
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61 not : Bool → Bool
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62 not true = false
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63 not false = true
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64
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65 _<=>_ : Bool → Bool → Bool
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66 true <=> true = true
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67 false <=> false = true
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68 _ <=> _ = false
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69
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70 infixr 130 _\/_
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71 infixr 140 _/\_
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72
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73 open import Relation.Binary.PropositionalEquality
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74
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75 record Bijection {n m : Level} (R : Set n) (S : Set m) : Set (n Level.⊔ m) where
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76 field
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77 fun← : S → R
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78 fun→ : R → S
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79 fiso← : (x : R) → fun← ( fun→ x ) ≡ x
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80 fiso→ : (x : S ) → fun→ ( fun← x ) ≡ x
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81
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82 injection : {n m : Level} (R : Set n) (S : Set m) (f : R → S ) → Set (n Level.⊔ m)
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83 injection R S f = (x y : R) → f x ≡ f y → x ≡ y
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84
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85
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86 not-not-bool : { b : Bool } → not (not b) ≡ b
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87 not-not-bool {true} = refl
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88 not-not-bool {false} = refl
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89
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90 ¬t=f : (t : Bool ) → ¬ ( not t ≡ t)
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91 ¬t=f true ()
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92 ¬t=f false ()
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93
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94 ≡-Bool-func : {A B : Bool } → ( A ≡ true → B ≡ true ) → ( B ≡ true → A ≡ true ) → A ≡ B
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95 ≡-Bool-func {true} {true} a→b b→a = refl
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96 ≡-Bool-func {false} {true} a→b b→a with b→a refl
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97 ... | ()
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98 ≡-Bool-func {true} {false} a→b b→a with a→b refl
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99 ... | ()
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100 ≡-Bool-func {false} {false} a→b b→a = refl
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101
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102 bool-≡-? : (a b : Bool) → Dec ( a ≡ b )
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103 bool-≡-? true true = yes refl
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104 bool-≡-? true false = no (λ ())
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105 bool-≡-? false true = no (λ ())
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106 bool-≡-? false false = yes refl
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107
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108 ¬-bool-t : {a : Bool} → ¬ ( a ≡ true ) → a ≡ false
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109 ¬-bool-t {true} ne = ⊥-elim ( ne refl )
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110 ¬-bool-t {false} ne = refl
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111
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112 ¬-bool-f : {a : Bool} → ¬ ( a ≡ false ) → a ≡ true
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113 ¬-bool-f {true} ne = refl
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114 ¬-bool-f {false} ne = ⊥-elim ( ne refl )
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115
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116 ¬-bool : {a : Bool} → a ≡ false → a ≡ true → ⊥
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117 ¬-bool refl ()
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118
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119 lemma-∧-0 : {a b : Bool} → a /\ b ≡ true → a ≡ false → ⊥
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120 lemma-∧-0 {true} {false} ()
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121 lemma-∧-0 {false} {true} ()
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122 lemma-∧-0 {false} {false} ()
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123 lemma-∧-0 {true} {true} eq1 ()
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124
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125 lemma-∧-1 : {a b : Bool} → a /\ b ≡ true → b ≡ false → ⊥
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126 lemma-∧-1 {true} {false} ()
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127 lemma-∧-1 {false} {true} ()
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128 lemma-∧-1 {false} {false} ()
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129 lemma-∧-1 {true} {true} eq1 ()
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130
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131 bool-and-tt : {a b : Bool} → a ≡ true → b ≡ true → ( a /\ b ) ≡ true
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132 bool-and-tt refl refl = refl
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133
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134 bool-∧→tt-0 : {a b : Bool} → ( a /\ b ) ≡ true → a ≡ true
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135 bool-∧→tt-0 {true} {true} eq = refl
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136 bool-∧→tt-0 {false} {_} ()
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137
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138 bool-∧→tt-1 : {a b : Bool} → ( a /\ b ) ≡ true → b ≡ true
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139 bool-∧→tt-1 {true} {true} eq = refl
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140 bool-∧→tt-1 {true} {false} ()
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141 bool-∧→tt-1 {false} {false} ()
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142
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143 bool-or-1 : {a b : Bool} → a ≡ false → ( a \/ b ) ≡ b
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144 bool-or-1 {false} {true} eq = refl
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145 bool-or-1 {false} {false} eq = refl
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146 bool-or-2 : {a b : Bool} → b ≡ false → (a \/ b ) ≡ a
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147 bool-or-2 {true} {false} eq = refl
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148 bool-or-2 {false} {false} eq = refl
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149
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150 bool-or-3 : {a : Bool} → ( a \/ true ) ≡ true
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151 bool-or-3 {true} = refl
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152 bool-or-3 {false} = refl
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153
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154 bool-or-31 : {a b : Bool} → b ≡ true → ( a \/ b ) ≡ true
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155 bool-or-31 {true} {true} eq = refl
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156 bool-or-31 {false} {true} eq = refl
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157
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158 bool-or-4 : {a : Bool} → ( true \/ a ) ≡ true
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159 bool-or-4 {true} = refl
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160 bool-or-4 {false} = refl
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161
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162 bool-or-41 : {a b : Bool} → a ≡ true → ( a \/ b ) ≡ true
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163 bool-or-41 {true} {b} eq = refl
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164
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165 bool-and-1 : {a b : Bool} → a ≡ false → (a /\ b ) ≡ false
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166 bool-and-1 {false} {b} eq = refl
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167 bool-and-2 : {a b : Bool} → b ≡ false → (a /\ b ) ≡ false
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168 bool-and-2 {true} {false} eq = refl
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169 bool-and-2 {false} {false} eq = refl
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170 bool-and-2 {true} {true} ()
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171 bool-and-2 {false} {true} ()
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172
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