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✨ Finished proof that delay is commutative

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Leon Vatthauer 2023-10-17 21:58:43 +02:00
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@ -15,6 +15,8 @@ We start out by formalizing Caprettas Delay Monad in category theory by existenc
```agda ```agda
open import Monad.Instance.Delay open import Monad.Instance.Delay
open import Monad.Instance.Delay.Strong
open import Monad.Instance.Delay.Commutative
``` ```
The next step is to quotient the delay monad by weak bisimilarity, in category theory this corresponds to existence of fitting coequalizers. The next step is to quotient the delay monad by weak bisimilarity, in category theory this corresponds to existence of fitting coequalizers.

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src/Monad/Instance/Delay/Commutative.lagda.md
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@ -93,50 +93,46 @@ module Monad.Instance.Delay.Commutative {o ℓ e} (ambient : Ambient o ℓ e) (D
where where
w = (distributeʳ⁻¹ +₁ distributeʳ⁻¹) ∘ distributeˡ⁻¹ ∘ (out ⁂ out) w = (distributeʳ⁻¹ +₁ distributeʳ⁻¹) ∘ distributeˡ⁻¹ ∘ (out ⁂ out)
g = out⁻¹ ∘ [ i₁ +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w g = out⁻¹ ∘ [ i₁ +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w
guarded = {! !} guarded : is-guarded g
-- guarded : is-guarded g guarded = [ idC +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w , (begin
-- guarded = [ idC +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w , (begin (i₁ +₁ idC) ∘ [ idC +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ≈⟨ pullˡ ∘[] ⟩
-- (i₁ +₁ idC) ∘ [ idC +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ≈⟨ pullˡ ∘[] ⟩ [ (i₁ +₁ idC) ∘ (idC +₁ D₁ i₁ ∘ σ) , (i₁ +₁ idC) ∘ i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ≈⟨ ([]-cong₂ +₁∘+₁ (pullˡ +₁∘i₂)) ⟩∘⟨refl ⟩
-- [ (i₁ +₁ idC) ∘ (idC +₁ D₁ i₁ ∘ σ) , (i₁ +₁ idC) ∘ i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ≈⟨ ([]-cong₂ +₁∘+₁ (pullˡ +₁∘i₂)) ⟩∘⟨refl ⟩ [ (i₁ ∘ idC +₁ idC ∘ D₁ i₁ ∘ σ) , (i₂ ∘ idC) ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ≈⟨ ([]-cong₂ (+₁-cong₂ identityʳ identityˡ) (identityʳ ⟩∘⟨refl)) ⟩∘⟨refl ⟩
-- [ (i₁ ∘ idC +₁ idC ∘ D₁ i₁ ∘ σ) , (i₂ ∘ idC) ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ≈⟨ ([]-cong₂ (+₁-cong₂ identityʳ identityˡ) (identityʳ ⟩∘⟨refl)) ⟩∘⟨refl ⟩ [ i₁ +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ≈⟨ sym (cancelˡ (_≅_.isoʳ out-≅)) ⟩
-- [ i₁ +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ≈⟨ sym (cancelˡ (_≅_.isoʳ out-≅)) ⟩ out ∘ out⁻¹ ∘ [ i₁ +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ∎)
-- out ∘ out⁻¹ ∘ [ i₁ +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ∎) helper₁ : (D₁ distributeʳ⁻¹) ∘ τ ≈ [ D₁ i₁ ∘ τ , D₁ i₂ ∘ τ ] ∘ distributeʳ⁻¹
-- helper₁ : (D₁ distributeʳ⁻¹) ∘ τ ≈ [ D₁ i₁ ∘ τ , D₁ i₂ ∘ τ ] ∘ distributeʳ⁻¹ helper₁ = Iso⇒Epi (IsIso.iso isIsoʳ) ((D₁ distributeʳ⁻¹) ∘ τ) ([ D₁ i₁ ∘ τ , D₁ i₂ ∘ τ ] ∘ distributeʳ⁻¹) (begin
-- helper₁ = Iso⇒Epi (IsIso.iso isIsoʳ) ((D₁ distributeʳ⁻¹) ∘ τ) ([ D₁ i₁ ∘ τ , D₁ i₂ ∘ τ ] ∘ distributeʳ⁻¹) (begin ((D₁ distributeʳ⁻¹) ∘ τ) ∘ distributeʳ ≈⟨ ∘[] ⟩
-- ((D₁ distributeʳ⁻¹) ∘ τ) ∘ distributeʳ ≈⟨ ∘[] ⟩ [ ((D₁ distributeʳ⁻¹) ∘ τ) ∘ (i₁ ⁂ idC) , ((D₁ distributeʳ⁻¹) ∘ τ) ∘ (i₂ ⁂ idC) ] ≈⟨ []-cong₂ (refl⟩∘⟨ (⁂-cong₂ refl (sym D-identity))) (refl⟩∘⟨ (⁂-cong₂ refl (sym D-identity))) ⟩
-- [ ((D₁ distributeʳ⁻¹) ∘ τ) ∘ (i₁ ⁂ idC) , ((D₁ distributeʳ⁻¹) ∘ τ) ∘ (i₂ ⁂ idC) ] ≈⟨ []-cong₂ (refl⟩∘⟨ (⁂-cong₂ refl (sym D-identity))) (refl⟩∘⟨ (⁂-cong₂ refl (sym D-identity))) ⟩ [ ((D₁ distributeʳ⁻¹) ∘ τ) ∘ (i₁ ⁂ D₁ idC) , ((D₁ distributeʳ⁻¹) ∘ τ) ∘ (i₂ ⁂ D₁ idC) ] ≈⟨ []-cong₂ (pullʳ (τ-commute (i₁ , idC))) (pullʳ (τ-commute (i₂ , idC))) ⟩
-- [ ((D₁ distributeʳ⁻¹) ∘ τ) ∘ (i₁ ⁂ D₁ idC) , ((D₁ distributeʳ⁻¹) ∘ τ) ∘ (i₂ ⁂ D₁ idC) ] ≈⟨ []-cong₂ (pullʳ (τ-commute (i₁ , idC))) (pullʳ (τ-commute (i₂ , idC))) ⟩ [ (D₁ distributeʳ⁻¹) ∘ D₁ (i₁ ⁂ idC) ∘ τ , (D₁ distributeʳ⁻¹) ∘ D₁ (i₂ ⁂ idC) ∘ τ ] ≈⟨ []-cong₂ (pullˡ (sym D-homomorphism)) (pullˡ (sym D-homomorphism)) ⟩
-- [ (D₁ distributeʳ⁻¹) ∘ D₁ (i₁ ⁂ idC) ∘ τ , (D₁ distributeʳ⁻¹) ∘ D₁ (i₂ ⁂ idC) ∘ τ ] ≈⟨ []-cong₂ (pullˡ (sym D-homomorphism)) (pullˡ (sym D-homomorphism)) ⟩ [ D₁ (distributeʳ⁻¹ ∘ (i₁ ⁂ idC)) ∘ τ , D₁ (distributeʳ⁻¹ ∘ (i₂ ⁂ idC)) ∘ τ ] ≈⟨ []-cong₂ (D-resp-≈ dstr-law₃ ⟩∘⟨refl) ((D-resp-≈ dstr-law₄) ⟩∘⟨refl) ⟩
-- [ D₁ (distributeʳ⁻¹ ∘ (i₁ ⁂ idC)) ∘ τ , D₁ (distributeʳ⁻¹ ∘ (i₂ ⁂ idC)) ∘ τ ] ≈⟨ []-cong₂ (D-resp-≈ dstr-law₃ ⟩∘⟨refl) ((D-resp-≈ dstr-law₄) ⟩∘⟨refl) ⟩ [ D₁ i₁ ∘ τ , D₁ i₂ ∘ τ ] ≈˘⟨ cancelʳ (IsIso.isoˡ isIsoʳ) ⟩
-- [ D₁ i₁ ∘ τ , D₁ i₂ ∘ τ ] ≈˘⟨ cancelʳ (IsIso.isoˡ isIsoʳ) ⟩ ([ D₁ i₁ ∘ τ , D₁ i₂ ∘ τ ] ∘ distributeʳ⁻¹) ∘ distributeʳ ∎)
-- ([ D₁ i₁ ∘ τ , D₁ i₂ ∘ τ ] ∘ distributeʳ⁻¹) ∘ distributeʳ ∎)
fixpoint₁ = {! !}
-- fixpoint₁ = Iso⇒Mono (_≅_.iso out-≅) (extend σ ∘ τ) (out⁻¹ ∘ [ idC +₁ σ , i₂ ∘ [ τ , ▷ ∘ extend σ ∘ τ ] ] ∘ w) (begin
-- out ∘ extend σ ∘ τ ≈⟨ pullˡ (extendlaw σ) ⟩
-- ([ out ∘ σ , i₂ ∘ extend' σ ] ∘ out) ∘ τ ≈⟨ pullʳ (τ-law (D₀ X , Y)) ⟩
-- [ out ∘ σ , i₂ ∘ extend' σ ] ∘ (idC +₁ τ) ∘ distributeˡ⁻¹ ∘ (idC ⁂ out) ≈⟨ pullˡ []∘+₁ ⟩
-- [ (out ∘ σ) ∘ idC , (i₂ ∘ extend' σ) ∘ τ ] ∘ distributeˡ⁻¹ ∘ (idC ⁂ out) ≈⟨ ([]-cong₂ (identityʳ ○ u-commutes (σ-coalg X Y)) assoc) ⟩∘⟨refl ⟩
-- [ (idC +₁ σ) ∘ distributeʳ⁻¹ ∘ (out ⁂ idC) , i₂ ∘ extend' σ ∘ τ ] ∘ distributeˡ⁻¹ ∘ (idC ⁂ out) ≈⟨ refl⟩∘⟨ refl⟩∘⟨ ⁂-cong₂ (sym (_≅_.isoˡ out-≅)) refl ⟩ fixpoint₁ = Iso⇒Mono (_≅_.iso out-≅) (extend σ ∘ τ) (out⁻¹ ∘ [ idC +₁ σ , i₂ ∘ [ τ , ▷ ∘ extend σ ∘ τ ] ] ∘ w) (begin
-- [ (idC +₁ σ) ∘ distributeʳ⁻¹ ∘ (out ⁂ idC) , i₂ ∘ extend' σ ∘ τ ] ∘ distributeˡ⁻¹ ∘ (out⁻¹ ∘ out ⁂ out) ≈⟨ sym (refl⟩∘⟨ refl⟩∘⟨ (⁂∘⁂ ○ ⁂-cong₂ refl (elimˡ ([]-unique id-comm-sym id-comm-sym)))) ⟩ out ∘ extend σ ∘ τ ≈⟨ pullˡ (extendlaw σ) ⟩
-- [ (idC +₁ σ) ∘ distributeʳ⁻¹ ∘ (out ⁂ idC) , i₂ ∘ extend' σ ∘ τ ] ∘ distributeˡ⁻¹ ∘ (out⁻¹ ⁂ (idC +₁ idC)) ∘ (out ⁂ out) ≈⟨ refl⟩∘⟨ pullˡ (sym (distribute₁ out⁻¹ idC idC)) ⟩ ([ out ∘ σ , i₂ ∘ extend' σ ] ∘ out) ∘ τ ≈⟨ pullʳ (τ-law (D₀ X , Y)) ⟩
[ out ∘ σ , i₂ ∘ extend' σ ] ∘ (idC +₁ τ) ∘ distributeˡ⁻¹ ∘ (idC ⁂ out) ≈⟨ pullˡ []∘+₁ ⟩
[ (out ∘ σ) ∘ idC , (i₂ ∘ extend' σ) ∘ τ ] ∘ distributeˡ⁻¹ ∘ (idC ⁂ out) ≈⟨ ([]-cong₂ (identityʳ ○ u-commutes (σ-coalg X Y)) assoc) ⟩∘⟨refl ⟩
[ (idC +₁ σ) ∘ distributeʳ⁻¹ ∘ (out ⁂ idC) , i₂ ∘ extend' σ ∘ τ ] ∘ distributeˡ⁻¹ ∘ (idC ⁂ out) ≈⟨ refl⟩∘⟨ refl⟩∘⟨ ⁂-cong₂ (sym (_≅_.isoˡ out-≅)) refl ⟩
[ (idC +₁ σ) ∘ distributeʳ⁻¹ ∘ (out ⁂ idC) , i₂ ∘ extend' σ ∘ τ ] ∘ distributeˡ⁻¹ ∘ (out⁻¹ ∘ out ⁂ out) ≈⟨ sym (refl⟩∘⟨ refl⟩∘⟨ (⁂∘⁂ ○ ⁂-cong₂ refl (elimˡ ([]-unique id-comm-sym id-comm-sym)))) ⟩
[ (idC +₁ σ) ∘ distributeʳ⁻¹ ∘ (out ⁂ idC) , i₂ ∘ extend' σ ∘ τ ] ∘ distributeˡ⁻¹ ∘ (out⁻¹ ⁂ (idC +₁ idC)) ∘ (out ⁂ out) ≈⟨ refl⟩∘⟨ pullˡ (sym (distribute₁ out⁻¹ idC idC)) ⟩
[ (idC +₁ σ) ∘ distributeʳ⁻¹ ∘ (out ⁂ idC) , i₂ ∘ extend' σ ∘ τ ] ∘ (((out⁻¹ ⁂ idC) +₁ (out⁻¹ ⁂ idC)) ∘ distributeˡ⁻¹) ∘ (out ⁂ out) ≈⟨ pullˡ (pullˡ []∘+₁) ⟩
([ ((idC +₁ σ) ∘ distributeʳ⁻¹ ∘ (out ⁂ idC)) ∘ (out⁻¹ ⁂ idC) , (i₂ ∘ extend' σ ∘ τ) ∘ (out⁻¹ ⁂ idC) ] ∘ distributeˡ⁻¹) ∘ (out ⁂ out) ≈⟨ assoc ○ ([]-cong₂ (pullʳ (cancelʳ (⁂∘⁂ ○ ⁂-cong₂ (_≅_.isoʳ out-≅) identity² ○ ⟨⟩-unique id-comm id-comm))) (refl⟩∘⟨ (⁂-cong₂ refl (sym D-identity)) ○ (pullʳ (pullʳ (τ-commute (out⁻¹ , idC)))))) ⟩∘⟨refl ⟩
[ (idC +₁ σ) ∘ distributeʳ⁻¹ , i₂ ∘ extend' σ ∘ D₁ (out⁻¹ ⁂ idC) ∘ τ ] ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈⟨ ([]-cong₂ refl (refl⟩∘⟨ (pullˡ (sym k-assoc)) ○ refl⟩∘⟨ ((extend-≈ (pullˡ k-identityʳ)) ⟩∘⟨refl))) ⟩∘⟨refl ⟩
[ (idC +₁ σ) ∘ distributeʳ⁻¹ , i₂ ∘ extend' (σ ∘ (out⁻¹ ⁂ idC)) ∘ τ ] ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈⟨ ([]-cong₂ refl (refl⟩∘⟨ ((extend-≈ σ-helper) ⟩∘⟨refl))) ⟩∘⟨refl ⟩
[ (idC +₁ σ) ∘ distributeʳ⁻¹ , i₂ ∘ extend' (out⁻¹ ∘ (idC +₁ σ) ∘ distributeʳ⁻¹) ∘ τ ] ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈˘⟨ ([]-cong₂ refl (refl⟩∘⟨ ((sym k-assoc ○ extend-≈ (pullˡ k-identityʳ) ○ extend-≈ assoc) ⟩∘⟨refl))) ⟩∘⟨refl ⟩
[ (idC +₁ σ) ∘ distributeʳ⁻¹ , i₂ ∘ (extend' (out⁻¹ ∘ (idC +₁ σ)) ∘ D₁ distributeʳ⁻¹) ∘ τ ] ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈⟨ ([]-cong₂ refl (refl⟩∘⟨ pullʳ helper₁)) ⟩∘⟨refl ⟩
[ (idC +₁ σ) ∘ distributeʳ⁻¹ , i₂ ∘ extend' (out⁻¹ ∘ (idC +₁ σ)) ∘ [ D₁ i₁ ∘ τ , D₁ i₂ ∘ τ ] ∘ distributeʳ⁻¹ ] ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈˘⟨ pullˡ ([]∘+₁ ○ []-cong₂ refl assoc²') ⟩
[ (idC +₁ σ) , i₂ ∘ extend' (out⁻¹ ∘ (idC +₁ σ)) ∘ [ D₁ i₁ ∘ τ , D₁ i₂ ∘ τ ] ] ∘ (distributeʳ⁻¹ +₁ distributeʳ⁻¹) ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈⟨ ([]-cong₂ refl (refl⟩∘⟨ ∘[])) ⟩∘⟨refl ⟩
[ (idC +₁ σ) , i₂ ∘ [ extend' (out⁻¹ ∘ (idC +₁ σ)) ∘ D₁ i₁ ∘ τ , extend' (out⁻¹ ∘ (idC +₁ σ)) ∘ D₁ i₂ ∘ τ ] ] ∘ (distributeʳ⁻¹ +₁ distributeʳ⁻¹) ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈⟨ ([]-cong₂ refl (refl⟩∘⟨ ([]-cong₂ (pullˡ ((sym k-assoc) ○ extend-≈ (pullˡ k-identityʳ))) (pullˡ ((sym k-assoc) ○ extend-≈ (pullˡ k-identityʳ)))))) ⟩∘⟨refl ⟩
[ (idC +₁ σ) , i₂ ∘ [ extend' ((out⁻¹ ∘ (idC +₁ σ)) ∘ i₁) ∘ τ , extend' ((out⁻¹ ∘ (idC +₁ σ)) ∘ i₂) ∘ τ ] ] ∘ (distributeʳ⁻¹ +₁ distributeʳ⁻¹) ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈⟨ ([]-cong₂ refl (refl⟩∘⟨ ([]-cong₂ ((extend-≈ (pullʳ +₁∘i₁)) ⟩∘⟨refl) ((extend-≈ (pullʳ +₁∘i₂)) ⟩∘⟨refl)))) ⟩∘⟨refl ⟩
[ (idC +₁ σ) , i₂ ∘ [ extend' (out⁻¹ ∘ i₁ ∘ idC) ∘ τ , extend' (out⁻¹ ∘ i₂ ∘ σ) ∘ τ ] ] ∘ (distributeʳ⁻¹ +₁ distributeʳ⁻¹) ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈⟨ ([]-cong₂ refl (refl⟩∘⟨ ([]-cong₂ (elimˡ ((extend-≈ (refl⟩∘⟨ identityʳ)) ○ k-identityˡ)) ((extend-≈ sym-assoc) ⟩∘⟨refl)))) ⟩∘⟨refl ⟩
[ (idC +₁ σ) , i₂ ∘ [ τ , extend' (▷ ∘ σ) ∘ τ ] ] ∘ (distributeʳ⁻¹ +₁ distributeʳ⁻¹) ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈⟨ ([]-cong₂ refl (refl⟩∘⟨ ([]-cong₂ refl ((sym (▷∘extendˡ σ)) ⟩∘⟨refl ○ assoc)))) ⟩∘⟨refl ⟩
[ idC +₁ σ , i₂ ∘ [ τ , ▷ ∘ extend σ ∘ τ ] ] ∘ w ≈˘⟨ cancelˡ (_≅_.isoʳ out-≅) ⟩
out ∘ out⁻¹ ∘ [ idC +₁ σ , i₂ ∘ [ τ , ▷ ∘ extend σ ∘ τ ] ] ∘ w ∎)
-- [ (idC +₁ σ) ∘ distributeʳ⁻¹ ∘ (out ⁂ idC) , i₂ ∘ extend' σ ∘ τ ] ∘ (((out⁻¹ ⁂ idC) +₁ (out⁻¹ ⁂ idC)) ∘ distributeˡ⁻¹) ∘ (out ⁂ out) ≈⟨ pullˡ (pullˡ []∘+₁) ⟩
-- ([ ((idC +₁ σ) ∘ distributeʳ⁻¹ ∘ (out ⁂ idC)) ∘ (out⁻¹ ⁂ idC) , (i₂ ∘ extend' σ ∘ τ) ∘ (out⁻¹ ⁂ idC) ] ∘ distributeˡ⁻¹) ∘ (out ⁂ out) ≈⟨ assoc ○ ([]-cong₂ (pullʳ (cancelʳ (⁂∘⁂ ○ ⁂-cong₂ (_≅_.isoʳ out-≅) identity² ○ ⟨⟩-unique id-comm id-comm))) (refl⟩∘⟨ (⁂-cong₂ refl (sym D-identity)) ○ (pullʳ (pullʳ (τ-commute (out⁻¹ , idC)))))) ⟩∘⟨refl ⟩
-- [ (idC +₁ σ) ∘ distributeʳ⁻¹ , i₂ ∘ extend' σ ∘ D₁ (out⁻¹ ⁂ idC) ∘ τ ] ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈⟨ ([]-cong₂ refl (refl⟩∘⟨ (pullˡ (sym k-assoc)) ○ refl⟩∘⟨ ((extend-≈ (pullˡ k-identityʳ)) ⟩∘⟨refl))) ⟩∘⟨refl ⟩
-- [ (idC +₁ σ) ∘ distributeʳ⁻¹ , i₂ ∘ extend' (σ ∘ (out⁻¹ ⁂ idC)) ∘ τ ] ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈⟨ ([]-cong₂ refl (refl⟩∘⟨ ((extend-≈ σ-helper) ⟩∘⟨refl))) ⟩∘⟨refl ⟩
-- [ (idC +₁ σ) ∘ distributeʳ⁻¹ , i₂ ∘ extend' (out⁻¹ ∘ (idC +₁ σ) ∘ distributeʳ⁻¹) ∘ τ ] ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈˘⟨ ([]-cong₂ refl (refl⟩∘⟨ ((sym k-assoc ○ extend-≈ (pullˡ k-identityʳ) ○ extend-≈ assoc) ⟩∘⟨refl))) ⟩∘⟨refl ⟩
-- [ (idC +₁ σ) ∘ distributeʳ⁻¹ , i₂ ∘ (extend' (out⁻¹ ∘ (idC +₁ σ)) ∘ D₁ distributeʳ⁻¹) ∘ τ ] ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈⟨ ([]-cong₂ refl (refl⟩∘⟨ pullʳ helper₁)) ⟩∘⟨refl ⟩
-- [ (idC +₁ σ) ∘ distributeʳ⁻¹ , i₂ ∘ extend' (out⁻¹ ∘ (idC +₁ σ)) ∘ [ D₁ i₁ ∘ τ , D₁ i₂ ∘ τ ] ∘ distributeʳ⁻¹ ] ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈˘⟨ pullˡ ([]∘+₁ ○ []-cong₂ refl assoc²') ⟩
-- [ (idC +₁ σ) , i₂ ∘ extend' (out⁻¹ ∘ (idC +₁ σ)) ∘ [ D₁ i₁ ∘ τ , D₁ i₂ ∘ τ ] ] ∘ (distributeʳ⁻¹ +₁ distributeʳ⁻¹) ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈⟨ ([]-cong₂ refl (refl⟩∘⟨ ∘[])) ⟩∘⟨refl ⟩
-- [ (idC +₁ σ) , i₂ ∘ [ extend' (out⁻¹ ∘ (idC +₁ σ)) ∘ D₁ i₁ ∘ τ , extend' (out⁻¹ ∘ (idC +₁ σ)) ∘ D₁ i₂ ∘ τ ] ] ∘ (distributeʳ⁻¹ +₁ distributeʳ⁻¹) ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈⟨ ([]-cong₂ refl (refl⟩∘⟨ ([]-cong₂ (pullˡ ((sym k-assoc) ○ extend-≈ (pullˡ k-identityʳ))) (pullˡ ((sym k-assoc) ○ extend-≈ (pullˡ k-identityʳ)))))) ⟩∘⟨refl ⟩
-- [ (idC +₁ σ) , i₂ ∘ [ extend' ((out⁻¹ ∘ (idC +₁ σ)) ∘ i₁) ∘ τ , extend' ((out⁻¹ ∘ (idC +₁ σ)) ∘ i₂) ∘ τ ] ] ∘ (distributeʳ⁻¹ +₁ distributeʳ⁻¹) ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈⟨ ([]-cong₂ refl (refl⟩∘⟨ ([]-cong₂ ((extend-≈ (pullʳ +₁∘i₁)) ⟩∘⟨refl) ((extend-≈ (pullʳ +₁∘i₂)) ⟩∘⟨refl)))) ⟩∘⟨refl ⟩
-- [ (idC +₁ σ) , i₂ ∘ [ extend' (out⁻¹ ∘ i₁ ∘ idC) ∘ τ , extend' (out⁻¹ ∘ i₂ ∘ σ) ∘ τ ] ] ∘ (distributeʳ⁻¹ +₁ distributeʳ⁻¹) ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈⟨ ([]-cong₂ refl (refl⟩∘⟨ ([]-cong₂ (elimˡ ((extend-≈ (refl⟩∘⟨ identityʳ)) ○ k-identityˡ)) ((extend-≈ sym-assoc) ⟩∘⟨refl)))) ⟩∘⟨refl ⟩
-- [ (idC +₁ σ) , i₂ ∘ [ τ , extend' (▷ ∘ σ) ∘ τ ] ] ∘ (distributeʳ⁻¹ +₁ distributeʳ⁻¹) ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈⟨ ([]-cong₂ refl (refl⟩∘⟨ ([]-cong₂ refl ((sym (▷∘extendˡ σ)) ⟩∘⟨refl ○ assoc)))) ⟩∘⟨refl ⟩
-- [ idC +₁ σ , i₂ ∘ [ τ , ▷ ∘ extend σ ∘ τ ] ] ∘ w ≈˘⟨ cancelˡ (_≅_.isoʳ out-≅) ⟩
-- out ∘ out⁻¹ ∘ [ idC +₁ σ , i₂ ∘ [ τ , ▷ ∘ extend σ ∘ τ ] ] ∘ w ∎)
helper₂ : (D₁ distributeˡ⁻¹) ∘ σ ≈ [ D₁ i₁ ∘ σ , D₁ i₂ ∘ σ ] ∘ distributeˡ⁻¹ helper₂ : (D₁ distributeˡ⁻¹) ∘ σ ≈ [ D₁ i₁ ∘ σ , D₁ i₂ ∘ σ ] ∘ distributeˡ⁻¹
helper₂ = Iso⇒Epi (IsIso.iso isIsoˡ) ((D₁ distributeˡ⁻¹) ∘ σ) ([ D₁ i₁ ∘ σ , D₁ i₂ ∘ σ ] ∘ distributeˡ⁻¹) (begin helper₂ = Iso⇒Epi (IsIso.iso isIsoˡ) ((D₁ distributeˡ⁻¹) ∘ σ) ([ D₁ i₁ ∘ σ , D₁ i₂ ∘ σ ] ∘ distributeˡ⁻¹) (begin
((D₁ distributeˡ⁻¹) ∘ σ) ∘ distributeˡ ≈⟨ ∘[] ⟩ ((D₁ distributeˡ⁻¹) ∘ σ) ∘ distributeˡ ≈⟨ ∘[] ⟩
@ -146,6 +142,27 @@ module Monad.Instance.Delay.Commutative {o ℓ e} (ambient : Ambient o ℓ e) (D
[ D₁ (distributeˡ⁻¹ ∘ (idC ⁂ i₁)) ∘ σ , D₁ (distributeˡ⁻¹ ∘ (idC ⁂ i₂)) ∘ σ ] ≈⟨ []-cong₂ (D-resp-≈ dstr-law₁ ⟩∘⟨refl) (D-resp-≈ dstr-law₂ ⟩∘⟨refl) ⟩ [ D₁ (distributeˡ⁻¹ ∘ (idC ⁂ i₁)) ∘ σ , D₁ (distributeˡ⁻¹ ∘ (idC ⁂ i₂)) ∘ σ ] ≈⟨ []-cong₂ (D-resp-≈ dstr-law₁ ⟩∘⟨refl) (D-resp-≈ dstr-law₂ ⟩∘⟨refl) ⟩
[ D₁ i₁ ∘ σ , D₁ i₂ ∘ σ ] ≈˘⟨ cancelʳ (IsIso.isoˡ isIsoˡ) ⟩ [ D₁ i₁ ∘ σ , D₁ i₂ ∘ σ ] ≈˘⟨ cancelʳ (IsIso.isoˡ isIsoˡ) ⟩
([ D₁ i₁ ∘ σ , D₁ i₂ ∘ σ ] ∘ distributeˡ⁻¹) ∘ distributeˡ ∎) ([ D₁ i₁ ∘ σ , D₁ i₂ ∘ σ ] ∘ distributeˡ⁻¹) ∘ distributeˡ ∎)
helper₃ = begin
[ idC +₁ τ , i₂ ∘ [ D₁ swap ∘ τ ∘ swap , ▷ ∘ extend τ ∘ σ ] ] ∘ (distributeˡ⁻¹ +₁ distributeˡ⁻¹) ∘ distributeʳ⁻¹ ∘ (out {X} ⁂ out {Y}) ≈⟨ refl⟩∘⟨ helper ⟩
[ idC +₁ τ , i₂ ∘ [ D₁ swap ∘ τ ∘ swap , ▷ ∘ extend τ ∘ σ ] ] ∘ [ [ i₁ ∘ i₁ , i₂ ∘ i₁ ] , [ (i₁ ∘ i₂) , (i₂ ∘ i₂) ] ] ∘ w ≈⟨ pullˡ ∘[] ⟩
[ [ idC +₁ τ , i₂ ∘ [ D₁ swap ∘ τ ∘ swap , ▷ ∘ extend τ ∘ σ ] ] ∘ [ i₁ ∘ i₁ , i₂ ∘ i₁ ] , [ idC +₁ τ , i₂ ∘ [ D₁ swap ∘ τ ∘ swap , ▷ ∘ extend τ ∘ σ ] ] ∘ [ (i₁ ∘ i₂) , (i₂ ∘ i₂) ] ] ∘ w ≈⟨ ([]-cong₂ ∘[] ∘[]) ⟩∘⟨refl ⟩
[ [ [ idC +₁ τ , i₂ ∘ [ D₁ swap ∘ τ ∘ swap , ▷ ∘ extend τ ∘ σ ] ] ∘ i₁ ∘ i₁ , [ idC +₁ τ , i₂ ∘ [ D₁ swap ∘ τ ∘ swap , ▷ ∘ extend τ ∘ σ ] ] ∘ i₂ ∘ i₁ ] , [ [ idC +₁ τ , i₂ ∘ [ D₁ swap ∘ τ ∘ swap , ▷ ∘ extend τ ∘ σ ] ] ∘ (i₁ ∘ i₂) , [ idC +₁ τ , i₂ ∘ [ D₁ swap ∘ τ ∘ swap , ▷ ∘ extend τ ∘ σ ] ] ∘ (i₂ ∘ i₂) ] ] ∘ w ≈⟨ ([]-cong₂ ([]-cong₂ (pullˡ inject₁) (pullˡ inject₂ ○ assoc)) ([]-cong₂ (pullˡ inject₁) (pullˡ inject₂ ○ assoc))) ⟩∘⟨refl ⟩
[ [ (idC +₁ τ) ∘ i₁ , i₂ ∘ [ D₁ swap ∘ τ ∘ swap , ▷ ∘ extend τ ∘ σ ] ∘ i₁ ] , [ (idC +₁ τ) ∘ i₂ , i₂ ∘ [ D₁ swap ∘ τ ∘ swap , ▷ ∘ extend τ ∘ σ ] ∘ i₂ ] ] ∘ w ≈⟨ ([]-cong₂ ([]-cong₂ (+₁∘i₁ ○ identityʳ) (refl⟩∘⟨ inject₁)) ([]-cong₂ +₁∘i₂ (refl⟩∘⟨ inject₂))) ⟩∘⟨refl ⟩
[ [ i₁ , i₂ ∘ σ ] , [ i₂ ∘ τ , i₂ ∘ ▷ ∘ extend τ ∘ σ ] ] ∘ w ≈˘⟨ ([]-cong₂ ([]-cong₂ identityʳ refl) ∘[]) ⟩∘⟨refl ⟩
[ idC +₁ σ , i₂ ∘ [ τ , ▷ ∘ extend τ ∘ σ ] ] ∘ w ∎
where
helper : (distributeˡ⁻¹ +₁ distributeˡ⁻¹) ∘ distributeʳ⁻¹ ∘ (out {X} ⁂ out {Y}) ≈ [ [ i₁ ∘ i₁ , i₂ ∘ i₁ ] , [ (i₁ ∘ i₂) , (i₂ ∘ i₂) ] ] ∘ w
helper = sym (begin
[ [ i₁ ∘ i₁ , i₂ ∘ i₁ ] , [ (i₁ ∘ i₂) , (i₂ ∘ i₂) ] ] ∘ w ≈⟨ pullˡ []∘+₁ ⟩
[ (i₁ +₁ i₁) ∘ distributeʳ⁻¹ , (i₂ +₁ i₂) ∘ distributeʳ⁻¹ ] ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈⟨ ([]-cong₂ ((+₁-cong₂ (sym dstr-law₁) (sym dstr-law₁)) ⟩∘⟨refl) ((+₁-cong₂ (sym dstr-law₂) (sym dstr-law₂)) ⟩∘⟨refl)) ⟩∘⟨refl ⟩
[ (distributeˡ⁻¹ ∘ (idC ⁂ i₁) +₁ distributeˡ⁻¹ ∘ (idC ⁂ i₁)) ∘ distributeʳ⁻¹ , (distributeˡ⁻¹ ∘ (idC ⁂ i₂) +₁ distributeˡ⁻¹ ∘ (idC ⁂ i₂)) ∘ distributeʳ⁻¹ ] ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈⟨ sym (([]-cong₂ (pullˡ +₁∘+₁) (pullˡ +₁∘+₁)) ⟩∘⟨refl) ⟩
[ (distributeˡ⁻¹ +₁ distributeˡ⁻¹) ∘ ((idC ⁂ i₁) +₁ (idC ⁂ i₁)) ∘ distributeʳ⁻¹ , (distributeˡ⁻¹ +₁ distributeˡ⁻¹) ∘ ((idC ⁂ i₂) +₁ (idC ⁂ i₂)) ∘ distributeʳ⁻¹ ] ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈⟨ sym (pullˡ ∘[]) ⟩
(distributeˡ⁻¹ +₁ distributeˡ⁻¹) ∘ [ ((idC ⁂ i₁) +₁ (idC ⁂ i₁)) ∘ distributeʳ⁻¹ , ((idC ⁂ i₂) +₁ (idC ⁂ i₂)) ∘ distributeʳ⁻¹ ] ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈⟨ refl⟩∘⟨ []-cong₂ (distribute₁' i₁ idC idC) (distribute₁' i₂ idC idC) ⟩∘⟨refl ⟩
(distributeˡ⁻¹ +₁ distributeˡ⁻¹) ∘ [ distributeʳ⁻¹ ∘ ((idC +₁ idC) ⁂ i₁) , distributeʳ⁻¹ ∘ ((idC +₁ idC) ⁂ i₂) ] ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈⟨ refl⟩∘⟨ (sym (pullˡ ∘[])) ⟩
(distributeˡ⁻¹ +₁ distributeˡ⁻¹) ∘ distributeʳ⁻¹ ∘ [ ((idC +₁ idC) ⁂ i₁) , ((idC +₁ idC) ⁂ i₂) ] ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈⟨ refl⟩∘⟨ refl⟩∘⟨ ([]-cong₂ (⁂-cong₂ ([]-unique id-comm-sym id-comm-sym) refl) (⁂-cong₂ ([]-unique id-comm-sym id-comm-sym) refl)) ⟩∘⟨refl ⟩
(distributeˡ⁻¹ +₁ distributeˡ⁻¹) ∘ distributeʳ⁻¹ ∘ [ (idC ⁂ i₁) , (idC ⁂ i₂) ] ∘ distributeˡ⁻¹ ∘ (out ⁂ out) ≈⟨ refl⟩∘⟨ refl⟩∘⟨ cancelˡ (IsIso.isoʳ isIsoˡ) ⟩
(distributeˡ⁻¹ +₁ distributeˡ⁻¹) ∘ distributeʳ⁻¹ ∘ (out ⁂ out) ∎)
fixpoint₂ = Iso⇒Mono ((_≅_.iso out-≅)) (extend τ ∘ σ) (out⁻¹ ∘ [ idC +₁ σ , i₂ ∘ [ τ , ▷ ∘ extend τ ∘ σ ] ] ∘ w) (begin fixpoint₂ = Iso⇒Mono ((_≅_.iso out-≅)) (extend τ ∘ σ) (out⁻¹ ∘ [ idC +₁ σ , i₂ ∘ [ τ , ▷ ∘ extend τ ∘ σ ] ] ∘ w) (begin
out ∘ extend τ ∘ σ ≈⟨ pullˡ (extendlaw τ) ⟩ out ∘ extend τ ∘ σ ≈⟨ pullˡ (extendlaw τ) ⟩
([ out ∘ τ , i₂ ∘ extend τ ] ∘ out) ∘ σ ≈⟨ pullʳ (u-commutes (σ-coalg X (D₀ Y))) ⟩ ([ out ∘ τ , i₂ ∘ extend τ ] ∘ out) ∘ σ ≈⟨ pullʳ (u-commutes (σ-coalg X (D₀ Y))) ⟩
@ -165,41 +182,28 @@ module Monad.Instance.Delay.Commutative {o ℓ e} (ambient : Ambient o ℓ e) (D
[ (idC +₁ τ) , i₂ ∘ [ extend (out⁻¹ ∘ (idC +₁ τ)) ∘ D₁ i₁ ∘ σ , extend (out⁻¹ ∘ (idC +₁ τ)) ∘ D₁ i₂ ∘ σ ] ] ∘ (distributeˡ⁻¹ +₁ distributeˡ⁻¹) ∘ distributeʳ⁻¹ ∘ (out ⁂ out) ≈⟨ ([]-cong₂ refl (refl⟩∘⟨ ([]-cong₂ (pullˡ (sym k-assoc ○ extend-≈ (pullˡ k-identityʳ))) (pullˡ (sym k-assoc ○ extend-≈ (pullˡ k-identityʳ)))))) ⟩∘⟨refl ⟩ [ (idC +₁ τ) , i₂ ∘ [ extend (out⁻¹ ∘ (idC +₁ τ)) ∘ D₁ i₁ ∘ σ , extend (out⁻¹ ∘ (idC +₁ τ)) ∘ D₁ i₂ ∘ σ ] ] ∘ (distributeˡ⁻¹ +₁ distributeˡ⁻¹) ∘ distributeʳ⁻¹ ∘ (out ⁂ out) ≈⟨ ([]-cong₂ refl (refl⟩∘⟨ ([]-cong₂ (pullˡ (sym k-assoc ○ extend-≈ (pullˡ k-identityʳ))) (pullˡ (sym k-assoc ○ extend-≈ (pullˡ k-identityʳ)))))) ⟩∘⟨refl ⟩
[ (idC +₁ τ) , i₂ ∘ [ extend ((out⁻¹ ∘ (idC +₁ τ)) ∘ i₁) ∘ σ , extend ((out⁻¹ ∘ (idC +₁ τ)) ∘ i₂) ∘ σ ] ] ∘ (distributeˡ⁻¹ +₁ distributeˡ⁻¹) ∘ distributeʳ⁻¹ ∘ (out ⁂ out) ≈⟨ []-cong₂ refl (refl⟩∘⟨ []-cong₂ (extend-≈ (pullʳ inject₁) ⟩∘⟨refl) (extend-≈ (pullʳ inject₂) ⟩∘⟨refl)) ⟩∘⟨refl ⟩ [ (idC +₁ τ) , i₂ ∘ [ extend ((out⁻¹ ∘ (idC +₁ τ)) ∘ i₁) ∘ σ , extend ((out⁻¹ ∘ (idC +₁ τ)) ∘ i₂) ∘ σ ] ] ∘ (distributeˡ⁻¹ +₁ distributeˡ⁻¹) ∘ distributeʳ⁻¹ ∘ (out ⁂ out) ≈⟨ []-cong₂ refl (refl⟩∘⟨ []-cong₂ (extend-≈ (pullʳ inject₁) ⟩∘⟨refl) (extend-≈ (pullʳ inject₂) ⟩∘⟨refl)) ⟩∘⟨refl ⟩
[ (idC +₁ τ) , i₂ ∘ [ extend (out⁻¹ ∘ i₁ ∘ idC) ∘ σ , extend (out⁻¹ ∘ i₂ ∘ τ) ∘ σ ] ] ∘ (distributeˡ⁻¹ +₁ distributeˡ⁻¹) ∘ distributeʳ⁻¹ ∘ (out ⁂ out) ≈⟨ []-cong₂ refl (refl⟩∘⟨ []-cong₂ (elimˡ (extend-≈ (refl⟩∘⟨ identityʳ) ○ k-identityˡ)) (extend-≈ sym-assoc ⟩∘⟨refl ○ sym (pullˡ (▷∘extendˡ τ)))) ⟩∘⟨refl ⟩ [ (idC +₁ τ) , i₂ ∘ [ extend (out⁻¹ ∘ i₁ ∘ idC) ∘ σ , extend (out⁻¹ ∘ i₂ ∘ τ) ∘ σ ] ] ∘ (distributeˡ⁻¹ +₁ distributeˡ⁻¹) ∘ distributeʳ⁻¹ ∘ (out ⁂ out) ≈⟨ []-cong₂ refl (refl⟩∘⟨ []-cong₂ (elimˡ (extend-≈ (refl⟩∘⟨ identityʳ) ○ k-identityˡ)) (extend-≈ sym-assoc ⟩∘⟨refl ○ sym (pullˡ (▷∘extendˡ τ)))) ⟩∘⟨refl ⟩
[ (idC +₁ τ) , i₂ ∘ [ σ , ▷ ∘ extend τ ∘ σ ] ] ∘ (distributeˡ⁻¹ +₁ distributeˡ⁻¹) ∘ distributeʳ⁻¹ ∘ (out ⁂ out) ≈⟨ {! !} ⟩ [ (idC +₁ τ) , i₂ ∘ [ σ , ▷ ∘ extend τ ∘ σ ] ] ∘ (distributeˡ⁻¹ +₁ distributeˡ⁻¹) ∘ distributeʳ⁻¹ ∘ (out ⁂ out) ≈⟨ helper₃ ⟩
[ (idC +₁ τ) , i₂ ∘ [ D₁ swap ∘ τ , ▷ ∘ extend τ ∘ σ ] ] ∘ (idC +₁ (swap +₁ idC)) ∘ (distributeˡ⁻¹ +₁ distributeˡ⁻¹) ∘ distributeʳ⁻¹ ∘ (out ⁂ out) ≈⟨ {! !} ⟩
{! !} ≈⟨ {! !} ⟩
{! !} ≈⟨ {! !} ⟩
-- TODO proof D₁ swap ∘ τ ≈ σ ∘ swap , follows by definition!!
-- ... wrong lead, brings σ back..
{-
extend τ ∘ σ
≈ extend τ ∘ D₁ swap ∘ τ ∘ swap
≈ extend (τ ∘ swap) ∘ τ ∘ swap
-}
{! !} ≈⟨ {! !} ⟩
{! !} ≈⟨ {! !} ⟩
[ idC +₁ D₁ swap ∘ τ , i₂ ∘ [ τ , ▷ ∘ extend τ ∘ σ ] ] ∘ ((idC +₁ swap) +₁ idC) ∘ w ≈⟨ {! !} ⟩
[ idC +₁ σ , i₂ ∘ [ τ , ▷ ∘ extend τ ∘ σ ] ] ∘ w ≈˘⟨ cancelˡ (_≅_.isoʳ out-≅) ⟩ [ idC +₁ σ , i₂ ∘ [ τ , ▷ ∘ extend τ ∘ σ ] ] ∘ w ≈˘⟨ cancelˡ (_≅_.isoʳ out-≅) ⟩
out ∘ out⁻¹ ∘ [ idC +₁ σ , i₂ ∘ [ τ , ▷ ∘ extend τ ∘ σ ] ] ∘ w ∎) out ∘ out⁻¹ ∘ [ idC +₁ σ , i₂ ∘ [ τ , ▷ ∘ extend τ ∘ σ ] ] ∘ w ∎)
fixpoint-eq = {! !}
-- fixpoint-eq : ∀ {f : D₀ X × D₀ Y ⇒ D₀ (X × Y)} → f ≈ out⁻¹ ∘ [ idC +₁ σ , i₂ ∘ [ τ , ▷ ∘ f ] ] ∘ w → f ≈ extend [ now , f ] ∘ g fixpoint-eq : ∀ {f : D₀ X × D₀ Y ⇒ D₀ (X × Y)} → f ≈ out⁻¹ ∘ [ idC +₁ σ , i₂ ∘ [ τ , ▷ ∘ f ] ] ∘ w → f ≈ extend [ now , f ] ∘ g
-- fixpoint-eq {f} fix = begin fixpoint-eq {f} fix = begin
-- f ≈⟨ fix ⟩ f ≈⟨ fix ⟩
-- out⁻¹ ∘ [ idC +₁ σ , i₂ ∘ [ τ , ▷ ∘ f ] ] ∘ w ≈˘⟨ refl⟩∘⟨ []-cong₂ refl (refl⟩∘⟨ ([]-cong₂ refl (pullʳ inject₂))) ⟩∘⟨refl ⟩ out⁻¹ ∘ [ idC +₁ σ , i₂ ∘ [ τ , ▷ ∘ f ] ] ∘ w ≈˘⟨ refl⟩∘⟨ []-cong₂ refl (refl⟩∘⟨ ([]-cong₂ refl (pullʳ inject₂))) ⟩∘⟨refl ⟩
-- out⁻¹ ∘ [ idC +₁ σ , i₂ ∘ [ τ , (▷ ∘ [ now , f ]) ∘ i₂ ] ] ∘ w ≈˘⟨ refl⟩∘⟨ []-cong₂ refl (sym ∘[] ○ refl⟩∘⟨ []-cong₂ (elimˡ (extend-≈ inject₁ ○ k-identityˡ)) (pullˡ k-identityʳ)) ⟩∘⟨refl ⟩ out⁻¹ ∘ [ idC +₁ σ , i₂ ∘ [ τ , (▷ ∘ [ now , f ]) ∘ i₂ ] ] ∘ w ≈˘⟨ refl⟩∘⟨ []-cong₂ refl (sym ∘[] ○ refl⟩∘⟨ []-cong₂ (elimˡ (extend-≈ inject₁ ○ k-identityˡ)) (pullˡ k-identityʳ)) ⟩∘⟨refl ⟩
-- out⁻¹ ∘ [ idC +₁ σ , [ i₂ ∘ extend ([ now , f ] ∘ i₁) ∘ τ , i₂ ∘ extend (▷ ∘ [ now , f ]) ∘ now ∘ i₂ ] ] ∘ w ≈˘⟨ refl⟩∘⟨ []-cong₂ ([]-cong₂ (sym identityʳ) (refl⟩∘⟨ (elimˡ ((extend-≈ inject₁) ○ k-identityˡ)))) ([]-cong₂ (pullʳ (pullˡ ((sym k-assoc) ○ extend-≈ (pullˡ k-identityʳ)))) (pullʳ (pullˡ (▷∘extendʳ [ now , f ])))) ⟩∘⟨refl ⟩ out⁻¹ ∘ [ idC +₁ σ , [ i₂ ∘ extend ([ now , f ] ∘ i₁) ∘ τ , i₂ ∘ extend (▷ ∘ [ now , f ]) ∘ now ∘ i₂ ] ] ∘ w ≈˘⟨ refl⟩∘⟨ []-cong₂ ([]-cong₂ (sym identityʳ) (refl⟩∘⟨ (elimˡ ((extend-≈ inject₁) ○ k-identityˡ)))) ([]-cong₂ (pullʳ (pullˡ ((sym k-assoc) ○ extend-≈ (pullˡ k-identityʳ)))) (pullʳ (pullˡ (▷∘extendʳ [ now , f ])))) ⟩∘⟨refl ⟩
-- out⁻¹ ∘ [ [ i₁ , i₂ ∘ extend ([ now , f ] ∘ i₁) ∘ σ ] , [ (i₂ ∘ extend [ now , f ]) ∘ D₁ i₁ ∘ τ , (i₂ ∘ extend [ now , f ]) ∘ ▷ ∘ now ∘ i₂ ] ] ∘ w ≈˘⟨ refl⟩∘⟨ []-cong₂ ([]-cong₂ inject₁ (pullʳ (pullˡ ((sym k-assoc) ○ extend-≈ (pullˡ k-identityʳ))))) ∘[] ⟩∘⟨refl ⟩ out⁻¹ ∘ [ [ i₁ , i₂ ∘ extend ([ now , f ] ∘ i₁) ∘ σ ] , [ (i₂ ∘ extend [ now , f ]) ∘ D₁ i₁ ∘ τ , (i₂ ∘ extend [ now , f ]) ∘ ▷ ∘ now ∘ i₂ ] ] ∘ w ≈˘⟨ refl⟩∘⟨ []-cong₂ ([]-cong₂ inject₁ (pullʳ (pullˡ ((sym k-assoc) ○ extend-≈ (pullˡ k-identityʳ))))) ∘[] ⟩∘⟨refl ⟩
-- out⁻¹ ∘ [ [ [ i₁ , out ∘ f ] ∘ i₁ , (i₂ ∘ extend [ now , f ]) ∘ D₁ i₁ ∘ σ ] , (i₂ ∘ extend [ now , f ]) ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ≈˘⟨ refl⟩∘⟨ (([]-cong₂ []∘+₁ (pullˡ inject₂)) ⟩∘⟨refl) ⟩ out⁻¹ ∘ [ [ [ i₁ , out ∘ f ] ∘ i₁ , (i₂ ∘ extend [ now , f ]) ∘ D₁ i₁ ∘ σ ] , (i₂ ∘ extend [ now , f ]) ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ≈˘⟨ refl⟩∘⟨ (([]-cong₂ []∘+₁ (pullˡ inject₂)) ⟩∘⟨refl) ⟩
-- out⁻¹ ∘ [ [ [ i₁ , out ∘ f ] , i₂ ∘ extend [ now , f ] ] ∘ (i₁ +₁ D₁ i₁ ∘ σ) , [ [ i₁ , out ∘ f ] , i₂ ∘ extend [ now , f ] ] ∘ i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ≈˘⟨ refl⟩∘⟨ (pullˡ ∘[]) ⟩ out⁻¹ ∘ [ [ [ i₁ , out ∘ f ] , i₂ ∘ extend [ now , f ] ] ∘ (i₁ +₁ D₁ i₁ ∘ σ) , [ [ i₁ , out ∘ f ] , i₂ ∘ extend [ now , f ] ] ∘ i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ≈˘⟨ refl⟩∘⟨ (pullˡ ∘[]) ⟩
-- out⁻¹ ∘ [ [ i₁ , out ∘ f ] , i₂ ∘ extend [ now , f ] ] ∘ [ i₁ +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ≈⟨ Iso⇒Mono (_≅_.iso out-≅) (out⁻¹ ∘ [ [ i₁ , out ∘ f ] , i₂ ∘ extend [ now , f ] ] ∘ [ i₁ +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w) (extend [ now , f ] ∘ out⁻¹ ∘ [ i₁ +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w) helper ⟩ out⁻¹ ∘ [ [ i₁ , out ∘ f ] , i₂ ∘ extend [ now , f ] ] ∘ [ i₁ +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ≈⟨ Iso⇒Mono (_≅_.iso out-≅) (out⁻¹ ∘ [ [ i₁ , out ∘ f ] , i₂ ∘ extend [ now , f ] ] ∘ [ i₁ +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w) (extend [ now , f ] ∘ out⁻¹ ∘ [ i₁ +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w) helper ⟩
-- extend [ now , f ] ∘ out⁻¹ ∘ [ i₁ +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ∎ extend [ now , f ] ∘ out⁻¹ ∘ [ i₁ +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ∎
-- where where
-- helper = begin helper = begin
-- out ∘ out⁻¹ ∘ [ [ i₁ , out ∘ f ] , i₂ ∘ extend [ now , f ] ] ∘ [ i₁ +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ≈⟨ cancelˡ (_≅_.isoʳ out-≅) ⟩ out ∘ out⁻¹ ∘ [ [ i₁ , out ∘ f ] , i₂ ∘ extend [ now , f ] ] ∘ [ i₁ +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ≈⟨ cancelˡ (_≅_.isoʳ out-≅) ⟩
-- [ [ i₁ , out ∘ f ] , i₂ ∘ extend [ now , f ] ] ∘ [ i₁ +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ≈˘⟨ ([]-cong₂ (∘[] ○ []-cong₂ unitlaw refl) refl) ⟩∘⟨refl ⟩ [ [ i₁ , out ∘ f ] , i₂ ∘ extend [ now , f ] ] ∘ [ i₁ +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ≈˘⟨ ([]-cong₂ (∘[] ○ []-cong₂ unitlaw refl) refl) ⟩∘⟨refl ⟩
-- [ out ∘ [ now , f ] , i₂ ∘ extend [ now , f ] ] ∘ [ i₁ +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ≈˘⟨ pullʳ (cancelˡ (_≅_.isoʳ out-≅)) ⟩ [ out ∘ [ now , f ] , i₂ ∘ extend [ now , f ] ] ∘ [ i₁ +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ≈˘⟨ pullʳ (cancelˡ (_≅_.isoʳ out-≅)) ⟩
-- ([ out ∘ [ now , f ] , i₂ ∘ extend [ now , f ] ] ∘ out) ∘ out⁻¹ ∘ [ i₁ +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ≈˘⟨ pullˡ (extendlaw [ now , f ]) ⟩ ([ out ∘ [ now , f ] , i₂ ∘ extend [ now , f ] ] ∘ out) ∘ out⁻¹ ∘ [ i₁ +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ≈˘⟨ pullˡ (extendlaw [ now , f ]) ⟩
-- out ∘ extend [ now , f ] ∘ out⁻¹ ∘ [ i₁ +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ∎ out ∘ extend [ now , f ] ∘ out⁻¹ ∘ [ i₁ +₁ D₁ i₁ ∘ σ , i₂ ∘ [ D₁ i₁ ∘ τ , ▷ ∘ now ∘ i₂ ] ] ∘ w ∎
{- {-
TODO there's an error in the paper, at the end of the proof of proposition two: TODO there's an error in the paper, at the end of the proof of proposition two:
the last line of the 3 line calulation 'f = ....' the last line of the 3 line calulation 'f = ....'