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✨ Finish proof of #-Diamond

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src/Algebra/Elgot.lagda.md
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@ -139,7 +139,6 @@ Here we give a different Characterization and show that it is equal.
[ (idC +₁ (i₁ +₁ idC)) ∘ i₁ ∘ h , (idC +₁ (i₁ +₁ idC)) ∘ [ (h +₁ i₁) , i₂ ∘ i₂ ] ∘ f ] ≈˘⟨ ∘[] ⟩
(idC +₁ (i₁ +₁ idC)) ∘ [ i₁ ∘ h , [ (h +₁ i₁) , i₂ ∘ i₂ ] ∘ f ] ∎
-- TODO Proposition 41
#-Diamond : ∀ {X} (f : X ⇒ A + (X + X)) → ((idC +₁ [ idC , idC ]) ∘ f)# ≈ ([ i₁ , ((idC +₁ [ idC , idC ]) ∘ f) # +₁ idC ] ∘ f) #
#-Diamond {X} f = begin
g # ≈⟨ introʳ inject₂ ⟩
@ -153,7 +152,8 @@ Here we give a different Characterization and show that it is equal.
[ i₁ , [ [ (idC +₁ i₁) ∘ i₁ , (i₂ ∘ i₂) ∘ i₁ ] ∘ g , [ (idC +₁ i₁) ∘ i₂ , (i₂ ∘ i₂) ∘ idC ] ∘ f ] ] # ∘ i₂ ∘ i₂ ≈⟨ ((#-resp-≈ ([]-cong₂ refl ([]-cong₂ (([]-cong₂ (+₁∘i₁ ○ identityʳ) assoc) ⟩∘⟨refl) (([]-cong₂ +₁∘i₂ identityʳ) ⟩∘⟨refl)))) ⟩∘⟨refl) ⟩
[ i₁ , [ [ i₁ , i₂ ∘ i₂ ∘ i₁ ] ∘ g , [ i₂ ∘ i₁ , i₂ ∘ i₂ ] ∘ f ] ] # ∘ i₂ ∘ i₂ ≈˘⟨ ((#-resp-≈ ([]-cong₂ refl ([]-cong₂ (pullˡ ([]∘+₁ ○ []-cong₂ identityʳ refl)) (∘[] ⟩∘⟨refl)))) ⟩∘⟨refl) ⟩
[ i₁ , [ [ i₁ , i₂ ] ∘ (idC +₁ i₂ ∘ i₁) ∘ g , (i₂ ∘ [ i₁ , i₂ ]) ∘ f ] ] # ∘ i₂ ∘ i₂ ≈⟨ ((#-resp-≈ ([]-cong₂ refl ([]-cong₂ (elimˡ +-η) ((elimʳ +-η) ⟩∘⟨refl)))) ⟩∘⟨refl) ⟩
[ i₁ , [ (idC +₁ i₂ ∘ i₁) ∘ g , i₂ ∘ f ] ] # ∘ i₂ ∘ i₂ {A = X} {B = X} ≈⟨ {! !} ⟩
[ i₁ , [ (idC +₁ i₂ ∘ i₁) ∘ g , i₂ ∘ f ] ] # ∘ i₂ ∘ i₂ ≈˘⟨ pullˡ (sym (#-Uniformity by-uni₂)) ⟩
[ [ i₁ , (idC +₁ i₁ ∘ i₂) ∘ g ] , i₂ ∘ h ] # ∘ [ i₁ ∘ i₁ , i₂ +₁ idC ] ∘ i₂ ∘ i₂ ≈⟨ (refl⟩∘⟨ (pullˡ inject₂ ○ (+₁∘i₂ ○ identityʳ))) ⟩
[ [ i₁ , (idC +₁ i₁ ∘ i₂) ∘ g ] , i₂ ∘ h ] # ∘ i₂ {A = A + X} {B = X} ≈˘⟨ ((#-resp-≈ ([]-cong₂ (∘[] ○ []-cong₂ (+₁∘i₁ ○ identityʳ) (pullˡ (+₁∘+₁ ○ +₁-cong₂ identity² refl))) refl)) ⟩∘⟨refl) ⟩
[ (idC +₁ i₁) ∘ [ i₁ , (idC +₁ i₂) ∘ g ] , i₂ ∘ h ] # ∘ i₂ ≈⟨ (sym #-Folding) ⟩∘⟨refl ⟩
([ i₁ , (idC +₁ i₂) ∘ g ] # +₁ h)# ∘ i₂ ≈⟨ ((#-resp-≈ (+₁-cong₂ by-fix refl)) ⟩∘⟨refl) ⟩
@ -167,13 +167,24 @@ Here we give a different Characterization and show that it is equal.
where
g = (idC +₁ [ idC , idC ]) ∘ f
h = [ i₁ ∘ i₁ , i₂ +₁ idC ] ∘ f
by-uni₂ : (idC +₁ [ i₁ ∘ i₁ , i₂ +₁ idC ]) ∘ [ i₁ , [ (idC +₁ i₂ ∘ i₁) ∘ g , i₂ ∘ f ] ] ≈ [ [ i₁ , (idC +₁ i₁ ∘ i₂) ∘ g ] , i₂ ∘ h ] ∘ [ i₁ ∘ i₁ , i₂ +₁ idC ]
by-uni₂ = begin
(idC +₁ [ i₁ ∘ i₁ , i₂ +₁ idC ]) ∘ [ i₁ , [ (idC +₁ i₂ ∘ i₁) ∘ g , i₂ ∘ f ] ] ≈⟨ ∘[] ⟩
[ (idC +₁ [ i₁ ∘ i₁ , i₂ +₁ idC ]) ∘ i₁ , (idC +₁ [ i₁ ∘ i₁ , i₂ +₁ idC ]) ∘ [ (idC +₁ i₂ ∘ i₁) ∘ g , i₂ ∘ f ] ] ≈⟨ []-cong₂ (+₁∘i₁ ○ identityʳ) ∘[] ⟩
[ i₁ , [ (idC +₁ [ i₁ ∘ i₁ , i₂ +₁ idC ]) ∘ (idC +₁ i₂ ∘ i₁) ∘ g , (idC +₁ [ i₁ ∘ i₁ , i₂ +₁ idC ]) ∘ i₂ ∘ f ] ] ≈⟨ []-cong₂ refl ([]-cong₂ (pullˡ +₁∘+₁) (pullˡ +₁∘i₂)) ⟩
[ i₁ , [ (idC ∘ idC +₁ [ i₁ ∘ i₁ , i₂ +₁ idC ] ∘ i₂ ∘ i₁) ∘ g , (i₂ ∘ [ i₁ ∘ i₁ , i₂ +₁ idC ]) ∘ f ] ] ≈⟨ []-cong₂ refl ([]-cong₂ ((+₁-cong₂ identity² (pullˡ inject₂ ○ +₁∘i₁)) ⟩∘⟨refl) (∘[] ⟩∘⟨refl)) ⟩
[ i₁ , [ (idC +₁ i₁ ∘ i₂) ∘ g , [ i₂ ∘ i₁ ∘ i₁ , i₂ ∘ (i₂ +₁ idC) ] ∘ f ] ] ≈˘⟨ []-cong₂ refl ([]-cong₂ refl (pullˡ ∘[])) ⟩
[ i₁ , [ (idC +₁ i₁ ∘ i₂) ∘ g , i₂ ∘ h ] ] ≈˘⟨ []-cong₂ inject₁ ([]-cong₂ inject₂ identityʳ) ⟩
[ [ i₁ , (idC +₁ i₁ ∘ i₂) ∘ g ] ∘ i₁ , [ [ i₁ , (idC +₁ i₁ ∘ i₂) ∘ g ] ∘ i₂ , (i₂ ∘ h) ∘ idC ] ] ≈˘⟨ []-cong₂ (pullˡ inject₁) []∘+₁ ⟩
[ [ [ i₁ , (idC +₁ i₁ ∘ i₂) ∘ g ] , i₂ ∘ h ] ∘ i₁ ∘ i₁ , [ [ i₁ , (idC +₁ i₁ ∘ i₂) ∘ g ] , i₂ ∘ h ] ∘ (i₂ +₁ idC) ] ≈˘⟨ ∘[] ⟩
[ [ i₁ , (idC +₁ i₁ ∘ i₂) ∘ g ] , i₂ ∘ h ] ∘ [ i₁ ∘ i₁ , i₂ +₁ idC ] ∎
by-uni₁ : (idC +₁ [ idC , idC ]) ∘ [ (idC +₁ i₁) ∘ g , f ] ≈ g ∘ [ idC , idC ]
by-uni₁ = begin
(idC +₁ [ idC , idC ]) ∘ [ (idC +₁ i₁) ∘ g , f ] ≈⟨ ∘[] ⟩
(idC +₁ [ idC , idC ]) ∘ [ (idC +₁ i₁) ∘ g , f ] ≈⟨ ∘[] ⟩
[ (idC +₁ [ idC , idC ]) ∘ (idC +₁ i₁) ∘ g , (idC +₁ [ idC , idC ]) ∘ f ] ≈⟨ []-cong₂ (pullˡ (+₁∘+₁ ○ +₁-cong₂ identity² inject₁)) refl ⟩
[ (idC +₁ idC) ∘ g , (idC +₁ [ idC , idC ]) ∘ f ] ≈⟨ []-cong₂ (elimˡ ([]-unique id-comm-sym id-comm-sym)) refl ⟩
[ g , g ] ≈⟨ sym (∘[] ○ []-cong₂ identityʳ identityʳ) ⟩
g ∘ [ idC , idC ] ∎
[ (idC +₁ idC) ∘ g , (idC +₁ [ idC , idC ]) ∘ f ] ≈⟨ []-cong₂ (elimˡ ([]-unique id-comm-sym id-comm-sym)) refl ⟩
[ g , g ] ≈⟨ sym (∘[] ○ []-cong₂ identityʳ identityʳ) ⟩
g ∘ [ idC , idC ] ∎
by-fix : [ i₁ , (idC +₁ i₂) ∘ g ] # ≈ [ idC , g # ]
by-fix = sym (begin
[ idC , g # ] ≈⟨ []-cong₂ refl #-Fixpoint ⟩