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main.agda
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main.agda
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module Quotient.Algebra where
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private
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open import Relation.Binary.PropositionalEquality as P using (proof-irrelevance; _≡_)
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open import Data.Nat using (ℕ; zero; suc)
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open import Data.Vec.N-ary
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N-ary-equality : ∀ {a} {A : Set a} (n : ℕ) → (f g : N-ary n A A) → Set (N-ary-level a a n)
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N-ary-equality {A = A} n f g = Eq {A = A} n (_≡_ {A = A}) f g
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private
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module N-ary-equality-Ex where
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open import Data.Nat
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ex₀ : N-ary-equality {A = ℕ} 0 2 2
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ex₀ = P.refl
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ex₁ : N-ary-equality {A = ℕ} 1 suc (λ ξ → ξ + 1)
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ex₁ zero = P.refl
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ex₁ (suc n) = P.cong suc (ex₁ n)
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open import Function using (flip)
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ex₂ : N-ary-equality {A = ℕ} 2 _+_ (flip _+_)
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ex₂ = +-comm
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where
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open import Algebra
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import Data.Nat.Properties
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open CommutativeSemiring Data.Nat.Properties.commutativeSemiring
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N-ary-irrelevance : ∀ {a} {A : Set a} (n : ℕ) → Set (N-ary-level a a n)
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N-ary-irrelevance {A = A} n = ∀ {f g} (p q : N-ary-equality {A = A} n f g) → p ≡ q
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postulate
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extensional-irrelevance : ∀ {a} {A : Set a} (n : ℕ) → N-ary-irrelevance {a} {A} n
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private
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module N-ary-irrelevance-Ex where
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ex₀ : N-ary-irrelevance {A = ℕ} 0
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ex₀ = proof-irrelevance
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ex₁ : N-ary-irrelevance {A = ℕ} 1
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ex₁ = extensional-irrelevance 1
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open import Quotient
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open import Algebra
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open import Relation.Binary -- using (Setoid)
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open import Algebra.Structures
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open import Data.Product
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open import Function
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open import Algebra.FunctionProperties using (Op₁; Op₂)
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import Algebra.FunctionProperties as FunProp
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Sound₁ : ∀ {c ℓ} (S : Setoid c ℓ) → let open Setoid S in Op₁ Carrier → Set _
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Sound₁ S f = let open Setoid S in f Preserves _≈_ ⟶ _≈_
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quot₁ : ∀ {c ℓ} {S : Setoid c ℓ} → let open Setoid S in
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{f : Op₁ Carrier} → (∙-sound : Sound₁ S f) → Op₁ (Quotient S)
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quot₁ {S = S} {f} prf = rec _ (λ x → [ f x ]) (λ x≈x′ → [ prf x≈x′ ]-cong)
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where
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open Setoid S
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Sound₂ : ∀ {c ℓ} (S : Setoid c ℓ) → let open Setoid S in Op₂ Carrier → Set _
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Sound₂ S ∙ = let open Setoid S in ∙ Preserves₂ _≈_ ⟶ _≈_ ⟶ _≈_
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quot₂ : ∀ {c ℓ} {S : Setoid c ℓ} → let open Setoid S in
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{∙ : Op₂ Carrier} → (∙-sound : Sound₂ S ∙) → Op₂ (Quotient S)
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quot₂ {S = S} {_∙_} prf = rec S (λ x → rec _ (λ y → [ x ∙ y ])
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(λ y≈y′ → [ refl ⟨ prf ⟩ y≈y′ ]-cong))
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-- (λ {x} {x′} x≈x′ → P.cong (λ ξ → rec S ξ _)
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-- (extensionality (λ _ → [ x≈x′ ⟨ prf ⟩ refl ]-cong)))
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(λ x≈x′ → extensionality (elim _ _ (λ _ → [ (x≈x′ ⟨ prf ⟩ refl) ]-cong)
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(λ _ → proof-irrelevance _ _)))
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where
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open Setoid S
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postulate extensionality : P.Extensionality _ _
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quot-assoc : ∀ {c ℓ} {S : Setoid c ℓ} →
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let
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open Setoid S
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module F₀ = FunProp _≈_
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module F = FunProp (_≡_ {A = Quotient S})
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in
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{∙ : Op₂ Carrier} → (∙-sound : Sound₂ S ∙) →
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F₀.Associative ∙ → F.Associative (quot₂ ∙-sound)
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quot-assoc {S = S} sound prf
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= elim S _
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(λ x → elim S _ (λ y → elim S _ (λ z → [ prf x y z ]-cong)
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(λ _ → extensional-irrelevance 0 _ _))
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(λ _ → extensional-irrelevance 1 _ _))
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(λ _ → extensional-irrelevance 2 _ _)
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quot-comm : ∀ {c ℓ} {S : Setoid c ℓ} →
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let
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open Setoid S
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module F₀ = FunProp _≈_
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module F = FunProp (_≡_ {A = Quotient S})
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in
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{∙ : Op₂ Carrier} → (∙-sound : Sound₂ S ∙) →
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F₀.Commutative ∙ → F.Commutative (quot₂ ∙-sound)
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quot-comm {S = S} sound prf
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= elim S _ (λ x → elim S _ (λ y → [ prf x y ]-cong)
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(λ _ → extensional-irrelevance 0 _ _))
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(λ _ → extensional-irrelevance 1 _ _)
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quot-leftDistrib : ∀ {c ℓ} {S : Setoid c ℓ} →
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let
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open Setoid S
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module F₀ = FunProp _≈_
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module F = FunProp (_≡_ {A = Quotient S})
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in
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{* : Op₂ Carrier} → (*-sound : Sound₂ S *) →
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{+ : Op₂ Carrier} → (+-sound : Sound₂ S +) →
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* F₀.DistributesOverˡ + →
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(quot₂ *-sound) F.DistributesOverˡ (quot₂ +-sound)
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quot-leftDistrib {S = S} {*} *-sound {+} +-sound prf
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= elim S _ (λ x → elim S _ (λ y → elim S _ (λ z → [ prf x y z ]-cong)
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(λ _ → extensional-irrelevance 0 _ _))
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(λ _ → extensional-irrelevance 1 _ _))
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(λ _ → extensional-irrelevance 2 _ _)
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quot-rightDistrib : ∀ {c ℓ} {S : Setoid c ℓ} →
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let
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open Setoid S
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module F₀ = FunProp _≈_
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module F = FunProp (_≡_ {A = Quotient S})
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in
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{* : Op₂ Carrier} → (*-sound : Sound₂ S *) →
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{+ : Op₂ Carrier} → (+-sound : Sound₂ S +) →
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* F₀.DistributesOverʳ + →
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(quot₂ *-sound) F.DistributesOverʳ (quot₂ +-sound)
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quot-rightDistrib {S = S} {*} *-sound {+} +-sound prf
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= elim S _ (λ x → elim S _ (λ y → elim S _ (λ z → [ prf x y z ]-cong)
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(λ _ → extensional-irrelevance 0 _ _))
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(λ _ → extensional-irrelevance 1 _ _))
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(λ _ → extensional-irrelevance 2 _ _)
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quot-distrib : ∀ {c ℓ} {S : Setoid c ℓ} →
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let
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open Setoid S
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module F₀ = FunProp _≈_
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module F = FunProp (_≡_ {A = Quotient S})
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in
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{* : Op₂ Carrier} → (*-sound : Sound₂ S *) →
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{+ : Op₂ Carrier} → (+-sound : Sound₂ S +) →
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* F₀.DistributesOver + →
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(quot₂ *-sound) F.DistributesOver (quot₂ +-sound)
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quot-distrib *-sound +-sound prf
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= quot-leftDistrib *-sound +-sound (proj₁ prf) , quot-rightDistrib *-sound +-sound (proj₂ prf)
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quot-leftIdentity : ∀ {c ℓ} {S : Setoid c ℓ} →
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let
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open Setoid S
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module F₀ = FunProp _≈_
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module F = FunProp (_≡_ {A = Quotient S})
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in
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{∙ : Op₂ Carrier} → (∙-sound : Sound₂ S ∙) →
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{ε : Carrier} →
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F₀.LeftIdentity ε ∙ → F.LeftIdentity [ ε ] (quot₂ ∙-sound)
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quot-leftIdentity {S = S} {∙} sound {ε} prf
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= elim S _ (λ x → [ prf x ]-cong)
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(λ _ → extensional-irrelevance 0 _ _)
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quot-rightIdentity : ∀ {c ℓ} {S : Setoid c ℓ} →
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let
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open Setoid S
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module F₀ = FunProp _≈_
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module F = FunProp (_≡_ {A = Quotient S})
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in
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{∙ : Op₂ Carrier} → (∙-sound : Sound₂ S ∙) →
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{ε : Carrier} →
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F₀.RightIdentity ε ∙ → F.RightIdentity [ ε ] (quot₂ ∙-sound)
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quot-rightIdentity {S = S} {∙} sound {ε} prf
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= elim S _
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(λ x → [ prf x ]-cong)
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(λ _ → extensional-irrelevance 0 _ _)
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quot-identity : ∀ {c ℓ} {S : Setoid c ℓ} →
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let
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open Setoid S
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module F₀ = FunProp _≈_
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module F = FunProp (_≡_ {A = Quotient S})
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in
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{∙ : Op₂ Carrier} → (∙-sound : Sound₂ S ∙) →
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{ε : Carrier} →
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F₀.Identity ε ∙ → F.Identity [ ε ] (quot₂ ∙-sound)
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quot-identity sound (prfˡ , prfʳ)
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= quot-leftIdentity sound prfˡ , quot-rightIdentity sound prfʳ
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quot-leftInverse : ∀ {c ℓ} {S : Setoid c ℓ} →
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let
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open Setoid S
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module F₀ = FunProp _≈_
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module F = FunProp (_≡_ {A = Quotient S})
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in
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{⁻¹ : Op₁ Carrier} → (⁻¹-sound : Sound₁ S ⁻¹) →
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{∙ : Op₂ Carrier} → (∙-sound : Sound₂ S ∙) →
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{ε : Carrier} →
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F₀.LeftInverse ε ⁻¹ ∙ → F.LeftInverse [ ε ] (quot₁ ⁻¹-sound) (quot₂ ∙-sound)
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quot-leftInverse {S = S} {_⁻¹} ⁻¹-sound {_∙_} ∙-sound {ε} prf
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= elim S _
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(λ x → [ prf x ]-cong)
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(λ _ → extensional-irrelevance 0 _ _)
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quot-rightInverse : ∀ {c ℓ} {S : Setoid c ℓ} →
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let
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open Setoid S
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module F₀ = FunProp _≈_
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module F = FunProp (_≡_ {A = Quotient S})
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in
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{⁻¹ : Op₁ Carrier} → (⁻¹-sound : Sound₁ S ⁻¹) →
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{∙ : Op₂ Carrier} → (∙-sound : Sound₂ S ∙) →
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{ε : Carrier} →
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F₀.RightInverse ε ⁻¹ ∙ → F.RightInverse [ ε ] (quot₁ ⁻¹-sound) (quot₂ ∙-sound)
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quot-rightInverse {S = S} {_⁻¹} ⁻¹-sound {_∙_} ∙-sound {ε} prf
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= elim S _
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(λ x → [ prf x ]-cong)
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(λ _ → extensional-irrelevance 0 _ _)
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quot-inverse : ∀ {c ℓ} {S : Setoid c ℓ} →
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let
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open Setoid S
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module F₀ = FunProp _≈_
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module F = FunProp (_≡_ {A = Quotient S})
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in
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{⁻¹ : Op₁ Carrier} → (⁻¹-sound : Sound₁ S ⁻¹) →
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{∙ : Op₂ Carrier} → (∙-sound : Sound₂ S ∙) →
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{ε : Carrier} →
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F₀.Inverse ε ⁻¹ ∙ → F.Inverse [ ε ] (quot₁ ⁻¹-sound) (quot₂ ∙-sound)
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quot-inverse ⁻¹-sound ∙-sound (prfˡ , prfʳ)
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= quot-leftInverse ⁻¹-sound ∙-sound prfˡ , quot-rightInverse ⁻¹-sound ∙-sound prfʳ
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quot-isSemigroup : ∀ {c ℓ} → (Σ : Semigroup c ℓ) → let open Semigroup Σ in
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IsSemigroup (_≡_ {A = Quotient setoid}) (quot₂ ∙-cong)
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quot-isSemigroup Σ = record
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{ isEquivalence = Relation.Binary.Setoid.isEquivalence (P.setoid _)
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; assoc = quot-assoc ∙-cong assoc
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; ∙-cong = P.cong₂ _
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}
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where
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open Semigroup Σ
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quot-isMonoid : ∀ {c ℓ} → (Σ : Monoid c ℓ) → let open Monoid Σ in
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IsMonoid (_≡_ {A = Quotient setoid}) (quot₂ ∙-cong) [ ε ]
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quot-isMonoid Σ = record
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{ isSemigroup = quot-isSemigroup semigroup
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; identity = quot-identity ∙-cong identity
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}
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where
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open Monoid Σ
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quot-isGroup : ∀ {c ℓ} → (Σ : Group c ℓ) → let open Group Σ in
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IsGroup (_≡_ {A = Quotient setoid}) (quot₂ ∙-cong) [ ε ] (quot₁ ⁻¹-cong)
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quot-isGroup Σ = record
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{ isMonoid = quot-isMonoid monoid
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; inverse = quot-inverse ⁻¹-cong ∙-cong inverse
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; ⁻¹-cong = P.cong _
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}
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where
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open Group Σ
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quot-isAbelianGroup : ∀ {c ℓ} → (Σ : AbelianGroup c ℓ) → let open AbelianGroup Σ in
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IsAbelianGroup (_≡_ {A = Quotient setoid}) (quot₂ ∙-cong) [ ε ] (quot₁ ⁻¹-cong)
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quot-isAbelianGroup Σ = record
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{ isGroup = quot-isGroup group
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; comm = quot-comm ∙-cong comm
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}
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where
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open AbelianGroup Σ
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quot-isRing : ∀ {c ℓ} → (Σ : Ring c ℓ) → let open Ring Σ in
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IsRing (_≡_ {A = Quotient setoid}) (quot₂ +-cong) (quot₂ *-cong) (quot₁ -‿cong) [ 0# ] [ 1# ]
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quot-isRing Σ = record
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{ +-isAbelianGroup = quot-isAbelianGroup +-abelianGroup
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; *-isMonoid = quot-isMonoid (record
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{ Carrier = Carrier
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; _≈_ = _≈_
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; _∙_ = _*_
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; ε = 1#
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; isMonoid = record
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{ isSemigroup = record
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{ isEquivalence = isEquivalence
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; assoc = *-assoc
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; ∙-cong = *-cong
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}
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; identity = *-identity }
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})
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; distrib = quot-distrib *-cong +-cong distrib
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}
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where
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open Ring Σ
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-- quot-semigroup : ∀ {c ℓ} → (Σ : Semigroup c ℓ) →
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-- Semigroup (ℓ ⊔ c) (ℓ ⊔ c)
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-- quot-semigroup Σ = record
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-- { Carrier = Quotient setoid
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-- ; _≈_ = _≡_
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-- ; _∙_ = quot₂ ∙₀ ∙-cong
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-- ; isSemigroup = quot-isSemigroup Σ
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-- }
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-- where
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-- open Semigroup Σ renaming (_∙_ to ∙₀)
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