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{-# OPTIONS --without-K --safe #-}
module Preorder.Primitive.Monoidal where
open import Level using (Level; _⊔_; suc)
open import Preorder.Primitive using (Preorder; module Isomorphism)
open import Preorder.Primitive.MonotoneMap using (MonotoneMap)
open import Data.Product using (_×_; _,_)
open import Data.Product.Relation.Binary.Pointwise.NonDependent using (Pointwise; ×-refl; ×-transitive)
_×ₚ_
: {c₁ c₂ ℓ₁ ℓ₂ : Level}
→ Preorder c₁ ℓ₁
→ Preorder c₂ ℓ₂
→ Preorder (c₁ ⊔ c₂) (ℓ₁ ⊔ ℓ₂)
_×ₚ_ P Q = record
{ Carrier = P.Carrier × Q.Carrier
; _≲_ = Pointwise P._≲_ Q._≲_
; refl = ×-refl {R = P._≲_} {S = Q._≲_} P.refl Q.refl
; trans = ×-transitive {R = P._≲_} {S = Q._≲_} P.trans Q.trans
}
where
module P = Preorder P
module Q = Preorder Q
infixr 2 _×ₚ_
record Monoidal {c ℓ : Level} (P : Preorder c ℓ) : Set (c ⊔ ℓ) where
open Preorder P
open Isomorphism P
field
unit : Carrier
tensor : MonotoneMap (P ×ₚ P) P
open MonotoneMap tensor using (map)
_⊗_ : Carrier → Carrier → Carrier
_⊗_ x y = map (x , y)
infixr 10 _⊗_
field
unitaryˡ : (x : Carrier) → unit ⊗ x ≅ x
unitaryʳ : (x : Carrier) → x ⊗ unit ≅ x
associative : (x y z : Carrier) → (x ⊗ y) ⊗ z ≅ x ⊗ (y ⊗ z)
record Symmetric {c ℓ : Level} {P : Preorder c ℓ} (M : Monoidal P) : Set (c ⊔ ℓ) where
open Monoidal M
open Preorder P
field
symmetry : (x y : Carrier) → x ⊗ y ≲ y ⊗ x
record MonoidalPreorder (c ℓ : Level) : Set (suc (c ⊔ ℓ)) where
field
U : Preorder c ℓ
monoidal : Monoidal U
open Preorder U public
open Monoidal monoidal public
record SymmetricMonoidalPreorder (c ℓ : Level) : Set (suc (c ⊔ ℓ)) where
field
U : Preorder c ℓ
monoidal : Monoidal U
symmetric : Symmetric monoidal
monoidalPreorder : MonoidalPreorder c ℓ
monoidalPreorder = record { monoidal = monoidal }
open Preorder U public
open Monoidal monoidal public
open Symmetric symmetric public
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