Implement monads in the kleisli form
This commit is contained in:
parent
0ca11874bc
commit
4ec13fe509
|
@ -4,3 +4,11 @@ Backlog
|
|||
Prove univalence for various categories
|
||||
|
||||
Prove postulates in `Cat.Wishlist`
|
||||
|
||||
* Functor ✓
|
||||
* Applicative Functor ✗
|
||||
* Lax monoidal functor ✗
|
||||
* Monoidal functor ✗
|
||||
* Tensorial strength ✗
|
||||
* Category ✓
|
||||
* Monoidal category ✗
|
|
@ -27,9 +27,10 @@ module Monoidal {ℓa ℓb : Level} (ℂ : Category ℓa ℓb) where
|
|||
-- (>=>)
|
||||
μNat : NaturalTransformation F[ R ∘ R ] R
|
||||
|
||||
module R = Functor R
|
||||
module RR = Functor F[ R ∘ R ]
|
||||
|
||||
private
|
||||
module R = Functor R
|
||||
module RR = Functor F[ R ∘ R ]
|
||||
module _ {X : Object} where
|
||||
-- module IdRX = Functor (F.identity {C = RX})
|
||||
|
||||
|
@ -69,3 +70,35 @@ module Monoidal {ℓa ℓb : Level} (ℂ : Category ℓa ℓb) where
|
|||
field
|
||||
isAssociative : IsAssociative
|
||||
isInverse : IsInverse
|
||||
|
||||
-- "A monad in the Kleisli form" [vlad]
|
||||
module Kleisli {ℓa ℓb : Level} (ℂ : Category ℓa ℓb) where
|
||||
private
|
||||
ℓ = ℓa ⊔ ℓb
|
||||
|
||||
open Category ℂ hiding (IsIdentity)
|
||||
record RawMonad : Set ℓ where
|
||||
field
|
||||
RR : Object → Object
|
||||
η : {X : Object} → ℂ [ X , RR X ]
|
||||
rr : {X Y : Object} → ℂ [ X , RR Y ] → ℂ [ RR X , RR Y ]
|
||||
-- Name suggestions are welcome!
|
||||
IsIdentity = {X : Object}
|
||||
→ rr η ≡ 𝟙 {RR X}
|
||||
IsNatural = {X Y : Object} (f : ℂ [ X , RR Y ])
|
||||
→ (ℂ [ rr f ∘ η ]) ≡ f
|
||||
IsDistributive = {X Y Z : Object} (g : ℂ [ Y , RR Z ]) (f : ℂ [ X , RR Y ])
|
||||
→ ℂ [ rr g ∘ rr f ] ≡ rr (ℂ [ rr g ∘ f ])
|
||||
|
||||
record IsMonad (raw : RawMonad) : Set ℓ where
|
||||
open RawMonad raw public
|
||||
field
|
||||
isIdentity : IsIdentity
|
||||
isNatural : IsNatural
|
||||
isDistributive : IsDistributive
|
||||
|
||||
record Monad : Set ℓ where
|
||||
field
|
||||
raw : RawMonad
|
||||
isMonad : IsMonad raw
|
||||
open IsMonad isMonad public
|
||||
|
|
Loading…
Reference in a new issue