Localization of monoidal categories #
Let C be a monoidal category equipped with a class of morphisms W which
is compatible with the monoidal category structure: this means W
is multiplicative and stable by left and right whiskerings (this is
the type class W.IsMonoidal). Let L : C ⥤ D be a localization functor
for W. In the file, we construct a monoidal category structure
on D such that the localization functor is monoidal. The structure
is actually defined on a type synonym LocalizedMonoidal L W ε.
Here, the data ε : L.obj (𝟙_ C) ≅ unit is an isomorphism to some
object unit : D which allows the user to provide a preferred choice
of a unit object.
A class of morphisms W in a monoidal category is monoidal if it is multiplicative
and stable under left and right whiskering. Under this condition, the localized
category can be equipped with a monoidal category structure, see LocalizedMonoidal.
- whiskerLeft (X : C) {Y₁ Y₂ : C} (g : Y₁ ⟶ Y₂) (hg : W g) : W (MonoidalCategoryStruct.whiskerLeft X g)
- whiskerRight {X₁ X₂ : C} (f : X₁ ⟶ X₂) (hf : W f) (Y : C) : W (MonoidalCategoryStruct.whiskerRight f Y)
Instances
Given a monoidal category C, a localization functor L : C ⥤ D with respect
to W : MorphismProperty C which satisfies W.IsMonoidal, and a choice
of object unit : D with an isomorphism L.obj (𝟙_ C) ≅ unit, this is a
type synonym for D on which we define the localized monoidal category structure.
Equations
- CategoryTheory.LocalizedMonoidal L W x✝ = D
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The monoidal functor from a monoidal category C to
its localization LocalizedMonoidal L W ε.
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The isomorphism ε : L.obj (𝟙_ C) ≅ unit,
as (toMonoidalCategory L W ε).obj (𝟙_ C) ≅ unit.
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The localized tensor product, as a bifunctor.
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The bifunctor tensorBifunctor on LocalizedMonoidal L W ε is induced by
curriedTensor C.
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The left unitor in the localized monoidal category LocalizedMonoidal L W ε.
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The right unitor in the localized monoidal category LocalizedMonoidal L W ε.
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The associator in the localized monoidal category LocalizedMonoidal L W ε.
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The compatibility isomorphism of the monoidal functor toMonoidalCategory L W ε
with respect to the tensor product.
Equations
- CategoryTheory.Localization.Monoidal.μ L W ε X Y = ((CategoryTheory.Localization.Monoidal.tensorBifunctorIso L W ε).app X).app Y
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