Proove identity laws for natural transformations

This commit is contained in:
Frederik Hanghøj Iversen 2018-02-16 12:46:25 +01:00
parent a64e2484e3
commit 73ab4d1836

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@ -142,10 +142,21 @@ module _ {c c' d d' : Level} { : Category c c'} {𝔻 : Cat
open IsCategory (isCategory 𝔻)
module _ {A B : Functor 𝔻} {f : NaturalTransformation A B} where
private
allNatural = naturalIsProp {F = A} {B}
f' = proj₁ f
module 𝔻Data = Category 𝔻
eq-r : C (𝔻 [ f' C identityTrans A C ]) f' C
eq-r C = begin
𝔻 [ f' C identityTrans A C ] ≡⟨⟩
𝔻 [ f' C 𝔻Data.𝟙 ] ≡⟨ proj₁ (𝔻.ident {A} {B})
f' C
eq-l : C (𝔻 [ identityTrans B C f' C ]) f' C
eq-l C = proj₂ (𝔻.ident {A} {B})
ident-r : (_:⊕:_ {A} {A} {B} f (identityNat A)) f
ident-r = {!!}
ident-r = lemSig allNatural _ _ (funExt eq-r)
ident-l : (_:⊕:_ {A} {B} {B} (identityNat B) f) f
ident-l = {!!}
ident-l = lemSig allNatural _ _ (funExt eq-l)
:ident:
: (_:⊕:_ {A} {A} {B} f (identityNat A)) f
× (_:⊕:_ {A} {B} {B} (identityNat B) f) f