Mercurial > hg > Members > atton > delta_monad
view agda/delta/functor.agda @ 104:ebd0d6e2772c
Trying redenition Delta with length constraints
author | Yasutaka Higa <e115763@ie.u-ryukyu.ac.jp> |
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date | Mon, 26 Jan 2015 23:00:05 +0900 |
parents | f26a954cd068 |
children | e6499a50ccbd |
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open import Level open import Relation.Binary.PropositionalEquality open import basic open import delta open import laws open import nat open import revision module delta.functor where -- Functor-laws -- Functor-law-1 : T(id) = id' functor-law-1 : {l : Level} {A : Set l} {n : Rev} -> (d : Delta A n) -> (delta-fmap id) d ≡ id d functor-law-1 (mono x) = refl functor-law-1 (delta x d) = cong (delta x) (functor-law-1 d) -- Functor-law-2 : T(f . g) = T(f) . T(g) functor-law-2 : {l : Level} {n : Rev} {A B C : Set l} -> (f : B -> C) -> (g : A -> B) -> (d : Delta A n) -> (delta-fmap (f ∙ g)) d ≡ ((delta-fmap f) ∙ (delta-fmap g)) d functor-law-2 f g (mono x) = refl functor-law-2 f g (delta x d) = cong (delta (f (g x))) (functor-law-2 f g d) delta-is-functor : {l : Level} {n : Rev} -> Functor {l} (\A -> Delta A n) delta-is-functor = record { fmap = delta-fmap ; preserve-id = functor-law-1; covariant = \f g -> functor-law-2 g f}