Choose new name for functor composition
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@ -42,26 +42,25 @@ module _ {ℓ ℓ' : Level} {A B : Category ℓ ℓ'} where
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-- The category of categories
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module _ {ℓ ℓ' : Level} where
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private
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_⊛_ = functor-comp
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module _ {A B C D : Category ℓ ℓ'} {f : Functor A B} {g : Functor B C} {h : Functor C D} where
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postulate assc : h ⊛ (g ⊛ f) ≡ (h ⊛ g) ⊛ f
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postulate assc : h ∘f (g ∘f f) ≡ (h ∘f g) ∘f f
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-- assc = lift-eq-functors refl refl {!refl!} λ i j → {!!}
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module _ {A B : Category ℓ ℓ'} {f : Functor A B} where
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lem : (func* f) ∘ (func* (identity {C = A})) ≡ func* f
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lem = refl
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-- lemmm : func→ {C = A} {D = B} (f ⊛ identity) ≡ func→ f
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-- lemmm : func→ {C = A} {D = B} (f ∘f identity) ≡ func→ f
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lemmm : PathP
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(λ i →
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{x y : Object A} → Arrow A x y → Arrow B (func* f x) (func* f y))
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(func→ (f ⊛ identity)) (func→ f)
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(func→ (f ∘f identity)) (func→ f)
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lemmm = refl
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postulate lemz : PathP (λ i → {c : A .Object} → PathP (λ _ → Arrow B (func* f c) (func* f c)) (func→ f (A .𝟙)) (B .𝟙))
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(ident (f ⊛ identity)) (ident f)
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(ident (f ∘f identity)) (ident f)
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-- lemz = {!!}
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postulate ident-r : f ⊛ identity ≡ f
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postulate ident-r : f ∘f identity ≡ f
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-- ident-r = lift-eq-functors lem lemmm {!lemz!} {!!}
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postulate ident-l : identity ⊛ f ≡ f
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postulate ident-l : identity ∘f f ≡ f
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-- ident-l = lift-eq-functors lem lemmm {!refl!} {!!}
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CatCat : Category (lsuc (ℓ ⊔ ℓ')) (ℓ ⊔ ℓ')
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@ -70,7 +69,7 @@ module _ {ℓ ℓ' : Level} where
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{ Object = Category ℓ ℓ'
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; Arrow = Functor
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; 𝟙 = identity
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; _⊕_ = functor-comp
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; _⊕_ = _∘f_
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-- What gives here? Why can I not name the variables directly?
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; isCategory = {!!}
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-- ; assoc = λ {_ _ _ _ f g h} → assc {f = f} {g = g} {h = h}
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@ -41,8 +41,8 @@ module _ {ℓ ℓ' : Level} {A B C : Category ℓ ℓ'} (F : Functor B C) (G : F
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F→ ((G→ α1) B⊕ (G→ α0)) ≡⟨ F .distrib ⟩
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(F→ ∘ G→) α1 C⊕ (F→ ∘ G→) α0 ∎
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functor-comp : Functor A C
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functor-comp =
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_∘f_ : Functor A C
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_∘f_ =
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record
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{ func* = F* ∘ G*
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; func→ = F→ ∘ G→
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@ -56,7 +56,6 @@ module _ {ℓ ℓ' : Level} {A B C : Category ℓ ℓ'} (F : Functor B C) (G : F
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-- The identity functor
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identity : ∀ {ℓ ℓ'} → {C : Category ℓ ℓ'} → Functor C C
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-- Identity = record { F* = λ x → x ; F→ = λ x → x ; ident = refl ; distrib = refl }
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identity = record
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{ func* = λ x → x
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; func→ = λ x → x
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