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{-# OPTIONS --without-K --safe #-}
open import Level using (Level)
open import Categories.Category.Monoidal using (MonoidalCategory)
open import Categories.Functor.Monoidal using (StrongMonoidalFunctor)
module Functor.Monoidal.Strong.Properties
{o o′ ℓ ℓ′ e e′ : Level}
{C : MonoidalCategory o ℓ e}
{D : MonoidalCategory o′ ℓ′ e′}
(F,φ,ε : StrongMonoidalFunctor C D) where
import Categories.Category.Monoidal.Utilities as ⊗-Utilities
import Categories.Category.Construction.Core as Core
open import Categories.Functor.Monoidal using (StrongMonoidalFunctor)
open import Categories.Functor.Properties using ([_]-resp-≅)
module C where
open MonoidalCategory C public
open ⊗-Utilities.Shorthands monoidal public using (α⇐)
module D where
open MonoidalCategory D public
open ⊗-Utilities.Shorthands monoidal using (α⇐) public
open Core.Shorthands U using (_∘ᵢ_; idᵢ; _≈ᵢ_; ⌞_⌟; to-≈; _≅_; module HomReasoningᵢ) public
open ⊗-Utilities monoidal using (_⊗ᵢ_) public
open D
open StrongMonoidalFunctor F,φ,ε
private
variable
X Y Z : C.Obj
Fα : F₀ ((X C.⊗₀ Y) C.⊗₀ Z) ≅ F₀ (X C.⊗₀ (Y C.⊗₀ Z))
Fα = [ F ]-resp-≅ C.associator
α : {A B C : D.Obj} → (A ⊗₀ B) ⊗₀ C ≅ A ⊗₀ (B ⊗₀ C)
α = associator
φ : F₀ X ⊗₀ F₀ Y ≅ F₀ (X C.⊗₀ Y)
φ = ⊗-homo.FX≅GX
φ⇒ : F₀ X ⊗₀ F₀ Y ⇒ F₀ (X C.⊗₀ Y)
φ⇒ = ⊗-homo.⇒.η _
φ⇐ : F₀ (X C.⊗₀ Y) ⇒ F₀ X ⊗₀ F₀ Y
φ⇐ = ⊗-homo.⇐.η _
associativityᵢ : Fα {X} {Y} {Z} ∘ᵢ φ ∘ᵢ φ ⊗ᵢ idᵢ ≈ᵢ φ ∘ᵢ idᵢ ⊗ᵢ φ ∘ᵢ α
associativityᵢ = ⌞ associativity ⌟
associativity-inv : φ⇐ ⊗₁ id ∘ φ⇐ ∘ F₁ (C.α⇐ {X} {Y} {Z}) ≈ α⇐ ∘ id ⊗₁ φ⇐ ∘ φ⇐
associativity-inv = begin
φ⇐ ⊗₁ id ∘ φ⇐ ∘ F₁ C.α⇐ ≈⟨ sym-assoc ⟩
(φ⇐ ⊗₁ id ∘ φ⇐) ∘ F₁ C.α⇐ ≈⟨ to-≈ associativityᵢ ⟩
(α⇐ ∘ id ⊗₁ φ⇐) ∘ φ⇐ ≈⟨ assoc ⟩
α⇐ ∘ id ⊗₁ φ⇐ ∘ φ⇐ ∎
where
open HomReasoning
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